CN101473081B - Absorptive article - Google Patents

Absorptive article Download PDF

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Publication number
CN101473081B
CN101473081B CN2007800227846A CN200780022784A CN101473081B CN 101473081 B CN101473081 B CN 101473081B CN 2007800227846 A CN2007800227846 A CN 2007800227846A CN 200780022784 A CN200780022784 A CN 200780022784A CN 101473081 B CN101473081 B CN 101473081B
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fiber
nonwoven fabric
convex shaped
area
protuberance
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CN101473081A (en
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野田祐树
黑田贤一郎
西川久美子
水谷聪
石川秀行
木村明宽
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Unicharm Corp
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Unicharm Corp
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Priority claimed from PCT/JP2007/062629 external-priority patent/WO2007148799A1/en
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Abstract

A nonwoven fabric provided with concave/convex portions, and openings, which can be adjusted to densify only a part of the peripheral edges of the openings, without excessively increasing the fiber density in the convex portions and the concave portions. A fiber web can be moved to an area where the down-slanting wires of woven wire extending in the direction of width (WD), thereby forming a first side edge portion in the openings. The fiber web is hardly displaced to the opposite side edges of the first side edges, namely a second side edge portions.

Description

Absorbent commodity
Technical field
The present invention relates to use the absorbent commodity of nonwoven fabric.
Background technology
At present, nonwoven fabric is widely used for field of medical products such as cleaning implements such as amenitiess such as paper nappy or physiological napkin, wiper, face shield.Like this, though nonwoven fabric is used for various field, in fact under the situation of the product that is used for each field, need manufacture character and structure with suitable each product purpose.
The making of nonwoven fabric for example utilizes dry process and damp process etc. to form fibrage (fiber web), makes combination between the fiber in the fibrage by chemical adhesion method or heat viscosity method etc.In being used in the operation that forms fibrolaminar fiber combination, exist make many pins to the method for this fibrage repeated puncture and the method for jet water course etc., comprise from the outside method of operation that applies the power of physics to fibrage.
But these methods also just make between the fiber and interweave, and fibrolaminar fiber alignment or setting and fibrolaminar shape etc. are not adjusted.That is the just nonwoven fabric made from these methods of sheet.
And, for example on the employed nonwoven fabric such as surface patch of absorbent commodity, drained under the situation of regulation liquid such as excreta, in order to keep or the tactility of improvement and skin, hope is to have concavo-convex nonwoven fabric (for example with reference to No. 3587831 communique of Japan Patent, hereinafter referred to as patent documentation 1).Patent documentation 1 comprises following disclosure.By first fibrage on the different fibroplastic a plurality of fibrages of heat-shrinkable, upper strata and the pattern part ground thermal welding of second fibrage to stipulate of lower floor.First fibrage partly swells by the second fibrolaminar thermal contraction.
Summary of the invention
Use at the surface patch (top flat) that uses as the skin contact of absorbent commodity under the situation of nonwoven fabric of patent documentation 1, about the liquid permeability of absorbent commodity can and liquid refluence rejection have following problem.
First fibrage on upper strata and second fibrage of lower floor are with the pattern thermal welding of regulation.Thermal welding portion becomes recess, in fact by filming.The area occupation ratio of thermal welding portion is 11.5%.The menses that fall into as the recess of thermal welding portion were once accumulating in recess, and the part beyond the thermal welding of adjacency moves to top flat is inner gradually.Therefore, when menses accumulated in recess, action changed in case take place a bit, and then menses might overflow to first fiber layer surface of recess periphery.Therefore, especially need to improve to liquid permeability.
And first fibrage on upper strata partly swells owing to the second fibrolaminar thermal contraction of lower floor.Because second fibrage is formed by the high heat-shrinkable fibre of percent thermal shrinkage, therefore form coiled type by thermal contraction.Therefore, simultaneously carry out thermal contraction because one side involves in the fiber of periphery, therefore, second fibrage becomes the high-density state of fibril aggregation.Like this, the rear side at top flat forms the state that the second fibrolaminar high-density region is set.Like this, should be not easy to move by absorbed menses, be trapped in high-density region easily from high-density region absorbed layer downwards.That is, the menses of Pai Guoing are owing to be trapped in the high-density region of the rear side of top flat repeatedly, and therefore, absorbed layer downwards moves the required time and becomes very long.Therefore, when menses accumulated in the rear side of top flat, action changed if take place a bit, and then menses might be exuded to first fiber layer surface.Therefore, especially need liquid refluence rejection is improved.
Like this, for absorbent commodity, use has concavo-convex nonwoven fabric as the surface patch that is used for skin contact (top flat), requires more comfortable performance.Especially, under the situation of exerting pressure with contact skin under the situation of draining menses repeatedly or seat etc., in order to eliminate make dirty skin or sticking z z z discomfort, problem be improve liquid permeability can and liquid refluence rejection.
The present invention makes in view of above-mentioned problem, and purpose provides the absorbent commodity with following nonwoven fabric, that is, have on the surface concavo-convex, easily make liquid such as excreta see through and be not easy because of external pressure etc. by the nonwoven fabric of conquassation.
Present inventors find, by from upper face side on the fiber web that the gas permeability support component that is prescribed supports from following side gas jet, this fibroreticulate fiber of formation is moved, can easy to manufacturely make the liquid infiltration and have concavo-convex nonwoven fabric, thereby finish the present invention.
First embodiment of the present invention is a kind of absorbent commodity, have: at least a portion be first chip part, the opaque liquid of liquid permeability second chip part, be arranged on the absorber parts between above-mentioned first chip part and above-mentioned second chip part, at least a portion of above-mentioned first chip part is made of the nonwoven portion with a plurality of protuberances and a plurality of recesses, and a plurality of protuberances are formed extended at both sides towards first direction first; A plurality of recesses above-mentioned first with above-mentioned a plurality of protuberances second direction side separately and above-mentioned first direction quadrature in abutting connection with, be formed extended at both sides to above-mentioned first direction, the fibre density of above-mentioned a plurality of protuberance side area separately is roughly the same at the thickness direction of above-mentioned nonwoven fabric, and has a fibre density that is higher than the average fiber density on this protuberance, the fibre density of the middle section that the thickness of above-mentioned a plurality of protuberance ratio side area separately is big is roughly the same at the thickness direction of above-mentioned nonwoven fabric, and has the fibre density that is lower than above-mentioned average fiber density.
Second embodiment of the present invention is as the described absorbent commodity of first embodiment, the fiber of this nonwoven fabric of formation of above-mentioned nonwoven fabric has along first directional fiber of above-mentioned first direction orientation with along second directional fiber of above-mentioned second direction orientation, at above-mentioned a plurality of protuberances, above-mentioned first directional fiber of above-mentioned side area is more than above-mentioned middle section.
The 3rd embodiment of the present invention is as the described absorbent commodity of second embodiment, any recess in above-mentioned a plurality of recess is arranged between the first adjacent protuberance and second protuberance in above-mentioned a plurality of protuberance, and comprise a plurality of peristomes and connecting portion, a plurality of peristomes are arranged between the first adjacent protuberance and second protuberance in above-mentioned a plurality of protuberance, form along above-mentioned first direction with the interval of regulation; Connecting portion between above-mentioned a plurality of peristomes, connect above-mentioned first protuberance and above-mentioned second protuberance, above-mentioned second directional fiber of above-mentioned connecting portion is more than above-mentioned side area.
The 4th embodiment of the present invention is as the described absorbent commodity of the 3rd embodiment, more with above-mentioned first directional fiber of above-mentioned a plurality of peristomes peripheral part separately of above-mentioned side area adjacency than above-mentioned connecting portion, more with above-mentioned second directional fiber of above-mentioned a plurality of peristomes peripheral part separately of above-mentioned connecting portion adjacency than above-mentioned side area.
The 5th embodiment of the present invention is as the described absorbent commodity of arbitrary mode in first embodiment to the, four embodiments, at above-mentioned a plurality of protuberances, and above-mentioned middle section more than above-mentioned side area to the thickness direction fibers inclined.
The 6th embodiment of the present invention is as the described absorbent commodity of arbitrary mode in first embodiment to the, five embodiments, constitute above-mentioned a plurality of recess separately the average weight per unit area of the fiber of bottom be lower than the average weight per unit area of the fiber that constitutes above-mentioned a plurality of protuberances above-mentioned middle section separately.
The 7th embodiment of the present invention is as the described absorbent commodity of arbitrary mode in second embodiment to the, six embodiments, and above-mentioned second directional fiber of the fiber of bottom is more than the fiber of the above-mentioned middle section of formation separately to constitute above-mentioned a plurality of recess.
The 8th embodiment of the present invention is as the described absorbent commodity of arbitrary mode in first embodiment to the, seven embodiments, for above-mentioned nonwoven fabric, by had to the one side side supporting units support that can make the part that fluid passes through, fiber is on the fiber assembly of the state with free degree and sprays the fluid that is mainly formed by gas, a part of fiber of above-mentioned fiber assembly moves, and forms above-mentioned a plurality of recess and above-mentioned a plurality of protuberance thus.
According to the present invention, can provide absorbent commodity, promptly with following nonwoven fabric, even form protuberance or recess, also be not easy because of external pressure etc. by conquassation, prevent that fibre density is too high, the liquid of regulation such as excreta is permeated easily, can improve liquid permeability can and liquid refluence rejection.
Description of drawings
Fig. 1 is the vertical view of the physiological napkin of first embodiment of the present invention.
Fig. 2 is the cutaway view along the F2-F2 line of Fig. 1.
Fig. 3 is first the vertical view that expression is used for the nonwoven fabric of top flat parts.
Fig. 4 is expression and first of Fig. 3 second opposite vertical view.
Fig. 5 is the amplification stereogram of the regional X among Fig. 3.
Fig. 6 is fibroreticulate stereogram.
Fig. 7 by the mesh-supported member supporting, make from the figure of the nonwoven fabric of Fig. 3 to Fig. 5.
Fig. 8 is the explanation stereogram of non-woven cloth manufacturing device.
Fig. 9 is second embodiment, is first vertical view of the employed nonwoven fabric of top flat parts on the physiological napkin of presentation graphs 1.
Figure 10 is expression and first of Fig. 9 second opposite vertical view.
Figure 11 is the amplification stereogram of the regional Y among Fig. 9.
Figure 12 by the gas permeability supporting units support, make from the figure of the nonwoven fabric of Fig. 9 to Figure 11.
Figure 13 is the figure of the average result (evaluation) about evaluation order.
Figure 14 is the pie graph of disposable diaper of the absorbent commodity of the 3rd embodiment.
The specific embodiment
1. first embodiment
As absorbent commodity of the present invention, at first be that example describes with the physiological napkin.Fig. 1 is the vertical view of the physiological napkin of first embodiment of the present invention.Fig. 2 is the cutaway view along the F2-F2 line of Fig. 1.
1-1. it is whole
As depicted in figs. 1 and 2, as the physiological napkin 501 of absorbent commodity have liquid permeability top flat parts 502, opaque liquid egative film parts 504 and be arranged on top flat parts 502 and egative film parts 504 between absorber parts 503.Physiological napkin 501 long side direction LD have the butt zone that comprises body excretes oral area position middle body 506, comprise the butt zone at position, health the place ahead the place ahead part 505, comprise the rear part 507 in the butt zone at position, health rear.
And physiological napkin 501 is at the dual-side of top flat parts 502, have a pair of lateral plate 508a, 508b along long side direction LD.At least a portion lateral plate 508a, 508b cover the part of top flat parts 502.Also can no illustrated embossed pattern be set to lateral plate 508a, 508b.Physiological napkin 501 stretches out a pair of wing 509a, 509b at width WD.On wing 509a, 509b, adhesive portion is set.For example by wing 509a, 509b are turned back, fix with the crotch part of underpants to non-skin contact side, physiological napkin 501 is installed on the underpants (does not have diagram).
Limit portion 510 on the place ahead part 505 of physiological napkin 501 is not only to long side direction LD but also the curve shape that stretches out to width WD.Limit portion 511 on the rear part 507 of physiological napkin 501 is not only to long side direction LD but also the curve shape that stretches out to width WD.In addition, in the present embodiment, long side direction LD is an example of first direction of the present invention, and the direction (MD) of machinery streamline is the same during with manufacturing physiological napkin 501.And width MD is an example of second direction of the present invention, with the same with the direction (CD) of direction (MD) quadrature of mechanical streamline.
The top flat parts 502 of physiological napkin 501 can be to be liquid permeability all, can a part be liquid permeabilities also.And, can constitute by a chip part, also can engage many chip parts and constitute.In the present embodiment, top flat parts 502 have the territory, liquid zone at the width WD of physiological napkin 501 at each lateral plate 508a, 508b between the junction surface of physiological napkin 501.
Leakproof zone 512 is set on top flat parts 502.Leakproof zone 512 for example is the embossed pattern that embossing is processed to form, and applies big pressing force to the thickness direction TD of physiological napkin 501, the less thick of absorber parts 503.To the pattern in leakproof zone 512 without limits.
The physiological napkin 501 of above-mentioned formation utilizes top flat parts 502 to receive excretas such as menses, makes its internal penetration to top flat parts 502, utilizes absorber parts 503 to absorb.The egative film parts 504 that are arranged on non-skin contact side are owing to be opaque liquid, and therefore, excreta is impermeable in non-skin contact side, and remain on the state that body component 503 absorbs that is absorbed.
1-2. top flat parts
Fig. 3 is first 521 the vertical view that expression is used for the nonwoven fabric of top flat parts 502.Fig. 4 is expression and first 521 of Fig. 3 second 522 opposite vertical view.Fig. 5 is a part of amplification stereogram of formation that is equivalent to the nonwoven fabric in the zone that surrounded by the X among Fig. 3.Suitably with reference to Fig. 1, Fig. 2, just Fig. 3 to Fig. 5 describes.
Top flat parts 502 are formed by portion within it that nonwoven fabric 110 space, liquid permeability constitutes between fiber.The nonwoven fabric 110 that constitutes top flat parts 502 have as first 521 of skin contact side to a plurality of convex shaped parts 2 that long side direction LD extends to form and with these a plurality of convex shaped parts 2 on width WD side in abutting connection with and a plurality of slot parts 1 of being formed extended at both sides to long side direction LD.At this, convex shaped part 2 is examples of protuberance of the present invention, and slot part 1 is an example of recess of the present invention.On this nonwoven fabric 110, smooth with second 522 to the first 521 of absorber parts 503 contact sides.
A plurality of convex shaped parts 2 have side area 8 and between dual-side zone 8 and thickness greater than the middle section 9 of side area 8.Side area 8 is roughly the same in the fibre density of the thickness direction TD of nonwoven fabric 110, and, have the fibre density that is higher than the average fiber density on the whole convex shaped part 2 that side area 8 adds middle section 9.And middle section 9 is roughly the same in the fibre density of the thickness direction TD of nonwoven fabric, and, have the fibre density that is lower than the average fiber density on the whole convex shaped part 2 that side area 8 adds middle section 9.
According to above-mentioned formation, at a plurality of convex shaped parts 2, side area 8 is roughly the same in the fibre density of thickness direction TD, and middle section 9 is roughly the same in the fibre density of thickness direction TD.Therefore, the menses by a plurality of convex shaped parts 2 do not accumulate in second 522 side yet, move to absorber parts 503 unobstructedly.Especially the fibre density owing to middle section 9 is low, therefore, and by guide to absorbent members 503 unobstructedly than the menses of side area more than 8 and with menses.And, though the fibre density of side area 8 is high owing to be not the state of filming, therefore can not make the user have foreign body sensation or with the sensation variation of contact skin.
And, because the fibre density of a plurality of convex shaped parts 2 side area 8 separately is than the height of middle section 9, so the rigidity height.Therefore, even applying to convex shaped part 2 under the situation of external pressure, middle section 9 also is positioned at the high rigidity side area 8 of middle section 9 both sides to be supported.Like this, a plurality of convex shaped part 2 be not easy because of external pressure etc. by conquassation.And, can prevent convex form because of the weight that contains liquid in a large number by conquassation.
Since convex shaped part 2 be not easy because of external pressure etc. by conquassation, therefore, by the good air permeability of slot part 1.That is the good permeability on the long side direction LD of top flat parts 502.On the other hand, than long side direction LD apart from short width WD, suppress the diffusion of menses by zone of fiber to the bottom of continuous convex shaped part 2 of long side direction LD and slot part 1.Like this, to form ability that the menses that prevent absorbent commodity (physiological napkin 501) leak strong and can guarantee the formation of gas permeability for top flat parts 502.
1-2-1. shape
Suitably the shape of the nonwoven fabric 110 that uses referring to figs. 1 through Fig. 5, with regard to top flat parts 502 is specifically described.For nonwoven fabric 110, by have to quilt the supporting units support one side side that can make the part that fluid described later passes through, fiber is in and sprays the main fluid that is formed by gas on the fiber assembly state with free degree under and make a part of fiber of above-mentioned fiber assembly move, and forms a plurality of slot parts 1 and a plurality of convex shaped part 2.
Nonwoven fabric 110 is in first 521 side of this nonwoven fabric 110, roughly equally spaced form a plurality of slot parts 1 side by side along long side direction LD.At this, in the present embodiment,, be not limited to this though a plurality of slot part 1 roughly equally spaced forms side by side, the interval between the adjacent slot part 1 also can be different.And, be not abreast yet but the interval variation ground between the slot part 1 formed.
And, between adjacent two slot parts 1,1, form each convex shaped part 2.A plurality of convex shaped parts 2,2 and slot part 1 similarly roughly equally spaced form side by side.The height of the convex shaped part 2 of the nonwoven fabric 110 in the present embodiment (thickness direction TD) but also can make the height of the convex shaped part 2 that adjoins each other form differently about equally.
As the distance of the thickness direction TD of the convex shaped part on the nonwoven fabric 110 2 promptly highly is 0.3 to 15mm, and preferably 0.5 to 5mm.And the length on each convex shaped part 2 and the second direction first direction quadrature (below be also referred to as laterally or width) for example is 0.5 to 30mm, and preferably 1.0 to 10mm.And the distance between adjacent convex shaped part 2,2 summits for example is 0.5 to 30mm, and preferably 3 to 10mm.
And, form height (distance of thickness direction TD) on the nonwoven fabric in zone of slot part 1 and for example be convex shaped part 2 height 0 to 90%, preferably 1 to 50%, 5 to 20% is better.The width of slot part 1 for example is 0.1 to 30mm, is preferably 0.5 to 10mm.Distance (spacing) between the adjacent slot part 1 of convex shaped part 2 for example is 0.5 to 20mm, is preferably 3 to 10mm.
Form slot part 1 and convex shaped part 2 as described above, under with the situation of nonwoven fabric 110,, also be not easy to ooze out in large area to the surface even drain a large amount of regulation liquid as surface patch (top flat) use of absorbent commodity.And, even when applying excessive external pressure convex shaped part 2 form will be by the state of conquassation, therefore the space that also keep slot part 1 to form easily, even when having drained the liquid of regulation under applying the state of external pressure, also is not easy to ooze out to the surface.And, even depress outside under the situation that will flow backwards, form concavo-convexly by surface at this nonwoven fabric 110 at the regulation liquid that once is absorbed absorption such as body, make nonwoven fabric 110 little with the contact area of skin, be not easy once more in large area attached on the skin.
At this, the measuring method of the height of slot part 1A or convex shaped part 2A, spacing, width is as follows.For example, nonwoven fabric 110 is placed on the workbench, utilizes microscope to measure the cross sectional photograph or the cross-sectional images of nonwoven fabric 110 with the state that does not have pressurization.Cut off nonwoven fabric 110 by convex shaped part 2 and slot part 1 ground as sample.
During measuring height (distance on the thickness direction TD), will rise from the upper/lower positions (that is workbench surface) of nonwoven fabric 110 towards the convex shaped part 2 of top and slot part 1 extreme higher position separately as highly measuring.
And when measuring spacing, the distance between the summit of the convex shaped part 2 of measurement adjacency is similarly measured slot part 1.
When measuring width, measure from the upper/lower positions (that is, the workbench surface) of nonwoven fabric 110 and rise towards the Breadth Maximum of the bottom surface of the convex shaped part 2 of top, similarly measure the Breadth Maximum of the bottom surface of slot part 1.
At this, the shape of convex shaped part 2 is not particularly limited.For example can be cheese, trapezoidal, triangle, Ω shape, quadrangle etc.For the sense of touch that makes nonwoven fabric 110 is good, near the end face of convex shaped part 2 and side is curved surface preferably.And for the space that also can keep when making convex shaped part 2 by conquassation because of external pressure etc. slot part 1 to form, convex shaped part 2 is preferably formed as the shape that its width narrows down towards end face from the bottom surface.The desired shapes of convex shaped part 2 for example is the curve (curved surface) of cheese etc. substantially.
1-2-2. fiber alignment
Suitably the fiber alignment of the nonwoven fabric 110 that uses referring to figs. 1 through Fig. 5, with regard to top flat parts 502 describes.On nonwoven fabric 110, the formation fiber of this nonwoven fabric 110 101 forms the zone that the fiber containing ratio to the direction orientation of regulation has nothing in common with each other.The zone that has nothing in common with each other for example is slot part 1, side area 8 and the middle section 9 (with reference to Fig. 3) that constitutes convex shaped part 2.
In nonwoven fabric 110, the fiber that constitutes this nonwoven fabric 110 has along first directional fiber of long side direction LD orientation with along second directional fiber of width WD orientation, and at a plurality of convex shaped parts 2, first directional fiber of side area 8 is than middle section more than 9.And second directional fiber of the fiber of bottom is more than the fiber of formation a plurality of convex shaped parts 2 middle section 9 separately separately to constitute a plurality of slot parts 1.And, a plurality of convex shaped parts 2 middle section 9 separately have fiber to thickness direction TD fibers inclined orientation than a plurality of convex shaped parts 2 side area more than 8 separately.
On above-mentioned first directional fiber, be meant that along the state of long side direction LD orientation fiber 100 relative long side direction LD (is with respect to exporting nonwoven fabric or fibroreticulate mechanical streamline direction (MD) by the machine of making nonwoven fabric 110 at this) are in the meaning of+45 degree to the scope interior orientations of-45 degree.And, will be called vertical directional fiber along the fiber (having fiber) of long side direction LD orientation near the fiber alignment of long side direction LD.Therefore, the meaning of vertical directional fiber is identical with first directional fiber.
On above-mentioned second directional fiber, along the state of width WD orientation be meant fiber 101 relative width direction WD (this be with respect to the direction (CD) of mechanical streamline direction (MD) quadrature) in the meaning of+45 degree to the scope interior orientations of-45 degree.And, will be called horizontal directional fiber along the fiber (having fiber) of width WD orientation near the fiber alignment of width WD.Therefore, the meaning of horizontal directional fiber is identical with second directional fiber.
The fiber that has to above-mentioned thickness direction TD fibers inclined orientation is meant fiber 101 relative horizontal planes ,+75 degree to the scopes of-75 degree, be preferably in+45 degree to the scopes of-45 degree to the thickness direction TD fiber of heeling condition directionally.
On a plurality of convex shaped parts 2 on the nonwoven fabric 110 that top flat parts 502 use, side area 8 along the fiber of long side direction LD orientation than middle section more than 9.That is, the containing ratio of the vertical directional fiber of the fiber 101 on the side area 8 of nonwoven fabric 110 is higher than the containing ratio of the vertical directional fiber on the middle section 9 (zone that is clipped by side area 8) in convex shaped part 2.
For example, the containing ratio of the vertical directional fiber on the side area 8 is 55 to 100%, is preferably 60 to 100%.The containing ratio of the vertical directional fiber on the side area 8 less than 55% situation under because the line tension in making, this side area 8 is unnecessarily elongated sometimes.And if side area 8 is drawn very longly, then slot part 1 and middle section described later 9 are also elongated by line tension, might cause shape destroyed.That is,, therefore,, prevent that side area 8 from unnecessarily being elongated by improving the containing ratio of the vertical directional fiber on the side area 8 because the line tension in making mainly is applied on the side area 8 of convex shaped part 2.Like this, convex shaped part 2 is not easy to destroy protuberance by being properly tensioned.
Constitute on the nonwoven fabric 110 that top flat parts 502 use a plurality of slot parts 1 separately the fiber of bottom second directional fiber, be that horizontal directional fiber is more than the fiber of a plurality of convex shaped parts 2 of formation middle section 9 separately.As mentioned above, the zone of the fluid (for example hot blast) that mainly formed by direct injection of slot part 1 by gas.Therefore, the vertical directional fiber on the slot part 1 is injected near side area 8.Horizontal directional fiber remains in slot part 1.Therefore, at slot part 1, the containing ratio of horizontal directional fiber is higher than the containing ratio of vertical directional fiber.
For example, the containing ratio of the vertical directional fiber on the slot part 1 is lower more than 10% than the containing ratio of the vertical directional fiber on the middle section 9.Therefore, on nonwoven fabric 110, slot part 1 is that the containing ratio of vertical directional fiber is minimum, the highest zone of containing ratio of horizontal directional fiber.Specifically be, the containing ratio of horizontal directional fiber is 55 to 100%, is preferably 60 to 100%.The containing ratio of horizontal directional fiber less than 55% situation under, as described later,, therefore, be not easy to improve the intensity of nonwoven fabric at width because the fiber weight per unit area of slot part 1 is low.Like this, for example the top flat of absorbent commodity (surface patch) uses under the situation of this nonwoven fabric 110, in use since with the friction of health, this absorbent commodity have at width be distorted, damaged danger.
A plurality of convex shaped parts 2 middle section 9 is separately compared with a plurality of convex shaped parts 2 side area 8 separately has more the fibers inclined directionally to thickness direction TD.Middle section 9 is become the zone that the side area 8 of both sides clips at convex shaped part 2, is the containing ratio zone lower than side area 8 of vertical directional fiber.This middle section 9 preferably moderately mixes vertical directional fiber and horizontal directional fiber.
For example, the containing ratio of the vertical directional fiber on the middle section 9 is lower more than 10% than the containing ratio of the vertical directional fiber on the side area 8, and is higher more than 10% than the containing ratio of the horizontal directional fiber on slot part described later 1 bottom.Specifically be that the containing ratio of the vertical directional fiber on the middle section 9 is preferably in 40 to 80% scope.Better is, vertical directional fiber on the middle section 9 and horizontal directional fiber have more thickness direction TD ,+75 degree to the scopes of-75 degree, be preferably in+45 degree are to the scope interior orientations of-45 degree, to the horizontal plane fibers inclined.Like this, even owing to the load that middle section 9 is applied makes the thickness of convex shaped part 2 reduce, under the situation of having removed load, utilize the rigidity of each fiber that directionally tilts to thickness direction TD, convex shaped part 2 returns to original thickness easily.That is, can be called the restorative high nonwoven fabric of compression.And, because liquid moves along fiber alignment easily, therefore, utilizing each fiber that directionally tilts to thickness direction TD, the liquid on the convex shaped part 2 passes through more unobstructedly.
The digital microscope VHX-100 that utilizes Keyemce Co., Ltd. to make measures fiber alignment, utilizes following measuring method to carry out.(1) with sample with its long side direction on observation platform for suitable direction fix, (2) dispose brokenly to outstanding in front fiber, with the most close fiber in front of the sample in focus of lens, (3) set the photography degree of depth (depth), make the 3D rendering of sample on the PC picture.(4) convert 3D rendering to the 2D image then, and (5) draw many at the parallel lines of measurement category with the in good time five equilibrium of long side direction (LD) on picture.(6) at the parallel lines that draw, carried out on each unit of detailed division, observing fiber alignment is first direction (long side direction) or second direction (width), measures the fiber number of orientation on all directions.Then, (7) calculate all fibres quantity in the relative setting range, towards the ratio of the fiber number of the fiber alignment of first direction (long side direction) with towards the ratio of the fiber number of the fiber alignment of second direction (width), can measure thus, calculate.
1-2-3. fiber density
, the fibre density of slot part 1 adjusted to be lower than convex shaped part 2 to shown in Figure 5 as Fig. 3.And various conditions such as amount that the fibre density of slot part 1 can be by the fluid (for example hot blast) that mainly formed by gas or tension force carry out freely adjusting.And, make the fibre density of convex shaped part 2 be higher than the fibre density of slot part 1.
Specifically be that the fibre density that constitutes the bottom of slot part 1 is 0.18g/cm 3Below, be preferably 0.002 to 0.18g/cm 3, 0.005 to 0.05g/cm 3Better.In the fibre density of the bottom of slot part 1 less than 0.002g/cm 3Situation under, for example this nonwoven fabric 110 is used under the situation of absorbent commodity etc., this nonwoven fabric 110 is damaged easily sometimes.And, in the fibre density of the bottom of this slot part 1 greater than 0.18g/cm 3Situation under, liquid is not easy downwards to move, and is trapped in this slot part 1 sometimes, makes the user that moist sensation be arranged.
The fibre density of convex shaped part 2 adjusted to be higher than slot part 1.And various conditions such as amount that the fibre density of convex shaped part 2 can be by the fluid (for example hot blast) that mainly formed by gas or tension force carry out freely adjusting.
The fibre density of the middle section 9 on the convex shaped part 2 for example is 0 to 0.20g/cm 3, be preferably 0.005 to 0.20g/cm 3, 0.007 to 0.07g/cm 3Better.Fibre density at this middle section 9 is lower than 0.005g/cm 3Situation under, sometimes this middle section 9 since the deadweight of the liquid that this middle section 9 contains or external pressure not only easily by conquassation, and the liquid that was once absorbing is depressed easy refluence adding sometimes.And, be higher than 0.20g/cm in the fibre density of middle section 9 3Situation under, the liquid that is excreted to this middle section 9 is not easy to move downwards, liquid is trapped in middle section 9 sometimes, makes the user that moist sensation be arranged.
And various conditions such as amount that the fibre density of the side area 8 on this convex shaped part 2 can be by the fluid (for example hot blast) that mainly formed by gas or tension force carry out freely adjusting.Specifically be that the fibre density of this side area 8 for example is 0 to 0.40g/cm 3, be preferably 0.007 to 0.25g/cm 3, 0.01 to 0.20g/cm 3Better.Fibre density in this side area 8 is lower than 0.007g/cm 3Situation under, side area 8 might be stretched by line tension.And, be higher than 0.40g/cm in the fibre density of this side area 8 3Situation under, the liquid that is excreted to this side area 8 is not easy to move downwards, liquid is trapped in side area 8 sometimes, makes the user that moist sensation be arranged.
1-2-4. fiber weight per unit area
The average weight per unit area of the fiber of whole nonwoven fabric 110 for example is 10 to 200g/m 2, be preferably 20 to 100g/m 2Under the situation of the top flat (surface patch) that this nonwoven fabric 110 is used for absorbent commodity, be lower than 10g/m as the average weight per unit area of fruit fiber 2, this top flat in use has damaged danger sometimes.And, be higher than 200g/m at the average weight per unit area of the fiber of this nonwoven fabric 110 2Situation under, liquid is not easy downwards to move sometimes.
, the weight per unit area of the fiber 101 of slot part 1 adjusted to be lower than convex shaped part 2 to shown in Figure 5 as Fig. 3.And, the fiber weight per unit area of slot part 1 bottom is adjusted to the average weight per unit area of the fiber that is lower than the whole nonwoven fabric that comprises slot part 1 bottom and convex shaped part 2.Specifically be that the fiber weight per unit area in this slot part 1 bottom for example is 3 to 150g/m 2, be preferably 5 to 80g/m 2At the fiber weight per unit area of slot part 1 bottom less than 3g/m 2Situation under, if this nonwoven fabric 110 is used as the top flat (surface patch) of absorbent commodity, then during using absorbent commodity sometimes top flat breakage takes place easily.And, at the fiber weight per unit area of this slot part 1 bottom greater than 150g/m 2Situation under because the liquid that is excreted to this slot part 1 is not easy to move, be trapped in slot part 1 downwards, make the user that moist sensation is arranged sometimes.
The average weight per unit area of the fiber 101 of convex shaped part 2 adjusted to be higher than slot part 1.The fiber weight per unit area of the middle section 9 of convex shaped part 2 for example is 15 to 250g/m 2, be preferably 20 to 120g/m 2At the fiber weight per unit area of this middle section 9 less than 15g/m 2Situation under, not only easily because the deadweight of the liquid that this middle section 9 contains or external pressure and by conquassation, and the liquid that was once absorbing is depressed easy refluence adding sometimes.And, be higher than 250g/m at the fiber weight per unit area of middle section 9 2Situation under, the liquid of drainage is not easy downwards to move, liquid holdup makes the user that moist sensation is arranged at this middle section 9 sometimes.
And various conditions such as amount that the fiber weight per unit area of the side area 8 on this convex shaped part 2 can be by the fluid (for example hot blast) that mainly formed by gas or tension force carry out freely adjusting.Specifically be that the fiber weight per unit area of this side area 8 for example is 20 to 280g/m 2, be preferably 25 to 150g/m 2Fiber weight per unit area in this side area 8 is lower than 20g/m 2Situation under, side area 8 might be stretched by line tension.And, be higher than 280g/m at the fiber weight per unit area of this side area 8 2Situation under, the liquid that is excreted to this side area 8 is not easy to move downwards, is trapped in side area 8, makes the user that moist sensation is arranged sometimes.
And, the average weight per unit area of the fabric integer on slot part 1 bottom is adjusted to the average weight per unit area of the fiber that is lower than the whole convex shaped part 2 that side area 8 and middle section 9 form.For example the fiber weight per unit area on slot part 1 bottom is below 90% of the average weight per unit area of fiber on the convex shaped part 2, is preferably 3 to 90%, 3 to 70% better.The average weight per unit area of fiber on the relative convex shaped part 2 of average weight per unit area of the fabric integer on slot part 1 bottom greater than 90% situation under, the resistance of liquid when the below of nonwoven fabric 110 is mobile of falling on the slot part 1 increases, and liquid overflows from slot part 1 sometimes.And, the average weight per unit area of fiber on the relative convex shaped part 2 of average weight per unit area of the fabric integer on slot part 1 bottom less than 3% situation under, if the top flat (surface patch) of this nonwoven fabric as absorbent commodity used, the damaged easily problem of surface patch then can appear during using this absorbent commodity.
1-2-5. other
According to above-mentioned embodiment, absorbent commodity is by using the top flat of nonwoven fabric 110 such structures, and slot part 1 makes the liquid infiltration easily, and therefore convex shaped part 2, is not easy to keep liquid owing to be loose structure.
The fibre density of the fiber 101 of slot part 1 bottom is lower than other zones, and weight per unit area is low, therefore, is fit to make liquid to pass through.And the fiber 101 on slot part 1 bottom is owing to width WD orientation, therefore, can prevent that liquid from flowing to the long side direction of nonwoven fabric 110 too much at slot part 1, diffusion in large area.And, since fiber 101 at slot part 1 to width WD orientation (CD orientation), therefore, compare with other zones, although weight per unit area is low, nonwoven fabric 110 improves to the intensity (CD intensity) of width WD.
The fiber weight per unit area of convex shaped part 2 adjusted to be higher than other zones, by like this, fiber number increases, so welding increases of counting, the maintenance loose structure.
1-2-6. manufacture method
Fig. 6 is fibroreticulate stereogram.Fig. 7 is that the fiber web of Fig. 6 is under by the state of mesh-supported member supporting, the side gas jet is come the state diagram of shop drawings 3 to nonwoven fabric shown in Figure 5 110 upward.Fig. 8 is the explanation stereogram of non-woven cloth manufacturing device.With reference to Fig. 6 to Fig. 8, the method for just making the nonwoven fabric 110 that the top flat parts 502 of absorbent commodity of the present invention use describes.
At first, fiber web 100 is placed on upper face side as the mesh-supported parts 210 of gas permeability support component.In other words, utilize mesh-supported parts 210 to support fiber web 100 (Fig. 7) from downside.Then, as shown in Figure 8, making the state mesh-supported parts 210 down that support this fiber web 100 is that gas permeability support component 200 is mobile to prescribed direction (F), by the upper face side continuous injection gas of the fiber web 100 that moves from this, can make the nonwoven fabric 110 of present embodiment.
As shown in Figure 7, the mesh-supported parts 210 as gas permeability support component 200 are to form by inweaving many wires 211 as the regulation thickness of non-ventilative portion.By inweaving many wire 211, can obtain forming the mesh-supported parts of the hole portion 213 of the ventilative portion of a plurality of conducts with having predetermined distance.
Mesh-supported parts shown in Figure 7 210 form the hole portion 213 of a plurality of small-bores, and the gas that sprays from the upper face side of fiber web 100 is not subjected to the obstruction ground of these mesh-supported parts 210 ventilative downwards.These mesh-supported parts 210 do not make injected gas flow that big change is arranged, and, the fiber 101 that constitutes fiber web 100 is not moved to the following direction of these mesh-supported parts 210.
Therefore, the fiber 101 that constitutes fiber web 100 mainly moves to the direction of regulation by the gas that sprays from upper face side.Specifically be that because restriction fiber 101 moves to the lower side of mesh-supported parts 210, therefore, fiber 101 moves to the direction along the surface of these mesh-supported parts 210.
Move in the zone of the fiber 101 in the zone of for example, injected gas not gas jet around it from this zone.And,, therefore, on fiber web 100, formed the zone of gas to the continuous injection of prescribed direction because move to prescribed direction in the zone of injected gas.Its result, move in the side zone of fiber 101 on this continuum.
Like this, form slot part 1, and the fiber 101 of slot part 1 moves directionally to width WD.And, between adjacent two slot parts 1,1, forming convex shaped part 2, the fibre density of the side portion on this convex shaped part 2 uprises, and fiber 101 is to long side direction LD orientation.
As shown in Figure 8, make the injection equipment that the non-woven cloth manufacturing device 90 of the nonwoven fabric 110 of present embodiment has gas permeability support component 200 and formed by ejection portion 910 and no illustrated air feed part.Gas permeability support component 200 is from the fiber web 100 of one side side support as fiber assembly.Ejection portion 910 sprays the fluid (the following fluid that also only is called sometimes) that is mainly formed by gas to fiber web 100 from the another side side of this fiber web 100.Air feed part is delivered to ejection portion 910 with fluid.
At this, on non-woven cloth manufacturing device 90, one side makes fiber web 100 move one side successively by travel mechanism and forms nonwoven fabric 110.This travel mechanism makes the fiber web 100 under the state that is supported from the one side side by gas permeability support component 200 move to prescribed direction.Specifically be that the fiber web 100 under the state that has sprayed mainly the fluid that is formed by gas is moved to prescribed direction F.Travel mechanism for example is a conveyer.
Can suitably change gas permeability support component 200 according to the nonwoven fabric of manufacturing.For example, under the situation of the nonwoven fabric 110 of making first embodiment, gas permeability support component 200 can use above-mentioned mesh-supported parts 210.Below, use above-mentioned mesh-supported parts 210 to describe with regard to gas permeability support component 200.
As mentioned above, conveyer (do not have diagram) makes the mesh-supported parts 210 that support under the state of fiber web 100 from following side move (with reference to Fig. 8) to prescribed direction F.Specifically be, make fiber web 100 pass ejection portion 910 downside move.And make fiber web 100 by internally moving as heater portion (not the having diagram) of the two sides opening of heating arrangements.
Injection equipment has no illustrated air feed part and ejection portion 910.Not having illustrated air feed part is connected with ejection portion 910 by snorkel 920.Snorkel 920 is connected with the upside of ejection portion 910 ventilatively.Interval with regulation in ejection portion 910 forms a plurality of ejiction openings 913.
Do not spray from a plurality of ejiction openings 913 to the gas that ejection portion 910 carries by snorkel 920 from there being illustrated air feed part.From the gas of a plurality of ejiction openings 913 ejections upper face side continuous injection to fiber web 100.Specifically be, from the gas of a plurality of ejiction openings 913 ejections upper face side continuous injection to the fiber web 100 of the machine that is transferred under the state that prescribed direction F moves.
Below ejection portion 910, be arranged on the suction unit 915 of mesh-supported parts 210 downsides, to carrying out air-breathing from 910 ejections of ejection portion and the gas etc. that sees through mesh-supported parts 210.At this, air-breathing by this suction unit 915 also can make fiber web 100 be attached on the mesh-supported parts 210 and locate.
The sucting strength of suction unit 915 will be so long as will spray the fiber 101 in the zone of fluid and get final product by the degree that is pressed on the mesh-supported parts 210.This suction unit 915 is by attracting injected fluid (air-breathing), and the fluid that can prevent to run into the non-ventilative portion (wires 211 of mesh-supported parts 210) of gas permeability support component 200 rebounds and causes the shape disorder of fiber web 100.And, can under the state of the shape of the slot part (concavo-convex) that further keeps air-flow to form etc., be transported in the no illustrated heater portion.In this case, suction unit 915 preferably attracts always, up to fiber web 100 is transported to heater portion.
And, attract fluid by downside from mesh-supported parts 210, the fiber in the zone of spraying fluid is simultaneously moved by being pressed in mesh-supported parts 210 sides by one side, therefore, fiber focuses on mesh-supported parts 210 sides.And at convex shaped part 2, the non-ventilative portion (wires 211 of mesh-supported parts 210) that collides gas permeability support component 200 owing to injected fluid rebounds, thereby a part of fiber 101 becomes the state towards thickness direction.
From the temperature of the fluid of each ejiction opening 913 ejections can be normal temperature, but for the formability that makes slot part (concavo-convex) etc. good, for example be adjustable to more than the softening point of the thermoplastic fibre that constitutes fiber assembly at least, preferably softening point above and fusing point+50 ℃ to-50 ℃ temperature.Fiber is in case softening, and then the bounce of fiber itself reduces, therefore, the shape of utilizing maintenances fiber such as air-flow to arrange again easily, in case further elevated temperature then begins thermal welding between the fiber, so the shape of easier maintenance slot part (concavo-convex) etc.Like this, under the state of the shape that keeps slot part (concavo-convex) etc., be transported to easily in the heater portion.
In addition, the air quantity by adjusting the fluid sprayed, temperature, traffic attraction, the gas permeability of mesh-supported parts 210, the weight per unit area of fiber web 100 etc. can make the change of shape of convex shaped part 2.For example, the amount of the fluid that is sprayed and institute attracts the amount of the fluid of (air-breathing) to equate substantially or attract under the situation more than the amount of fluid of (air-breathing), second side (rear side) of the convex shaped part 2 on the nonwoven fabric 115 (nonwoven fabric 110) is along the shape formation of mesh-supported parts 210.Therefore, under mesh-supported parts 210 were smooth situation, second side on this nonwoven fabric 115 (nonwoven fabric 110) was smooth substantially.
And, be transported to heater portion (nothing illustrates) under the state for the shape that waits at the slot part (concavo-convex) that further keeps by shaping such as air-flows, can be by in heater portion, carrying immediately or when being shaped behind the shaping slot parts (concavo-convex) such as air-flow etc., perhaps, be transported to heater portion afterwards by cooling off by cold wind immediately behind hot blast (air-flow of set point of temperature) shaping slot part (concavo-convex) etc.
Opening is carried out at the two ends of heater portion on prescribed direction F as heating arrangements.Like this, the fiber web 100 (nonwoven fabric 110) that is loaded on the mesh-supported parts 210 moves with being detained the stipulated time in the heating space that is formed on heater inside continuously.For example, contain under the situation of thermoplastic fibre,, can obtain having carried out between the fiber 101 nonwoven fabric 115 (nonwoven fabric 110) of combination by the heating of heater portion at the fiber 101 that constitutes fiber web 100 (nonwoven fabric 110).
2. second embodiment
2-1. it is whole
Whole mode is the physiological napkin identical with first embodiment.Therefore, omit explanation (with reference to 1-1. integral body).
2-2. top flat parts
Fig. 9 is second embodiment, is first 521 the vertical view that top flat parts 502 on the physiological napkin 501 of presentation graphs 1 use nonwoven fabric.Figure 10 is expression and first 521 of Fig. 9 second 522 opposite vertical view.Figure 11 is that expression is equivalent to a part of amplification stereogram that the nonwoven fabric in the zone that the Y among Fig. 9 surrounds constitutes.Suitably with reference to Fig. 1, Fig. 2, just Fig. 9 to Figure 11 describes.
Top flat parts 502 are formed by portion within it that nonwoven fabric 120 space, liquid permeability constitutes between fiber.The nonwoven fabric 120 that constitutes top flat parts 502 is to have a plurality of peristomes that form with the interval of stipulating at slot part 1 with the different formations of the nonwoven fabric 110 shown in first embodiment.That is, be arranged between the adjacent convex shaped part (first convex shaped part 2 and second convex shaped part 2) in a plurality of convex shaped parts 2 as the slot part 1 of an example of recess, and, a plurality of peristomes 3 that form with the interval of regulation along long side direction LD had.And, connect connecting portion 4 between the adjacent convex shaped part (first convex shaped part 2 and second convex shaped part 2) and be arranged between the adjacent peristome (first peristome 3 and second peristome 3) in a plurality of peristomes 3.
The fibre density of a plurality of convex shaped parts 2 side area 8 separately is equal substantially at the thickness direction TD of nonwoven fabric 120, and, have the fibre density that is higher than the average fiber density on this convex shaped part 2.And thickness is equal substantially at the thickness direction TD of nonwoven fabric greater than the fibre density of the middle section 9 of a plurality of convex shaped parts 2 side area 8 separately, and, have the fibre density that is lower than the average fiber density on this convex shaped part 2.
And, with a plurality of peristomes 3 peripheral part separately of side area 8 adjacency, have than connecting portion 4 more vertical directional fibers (first directional fiber), this vertical directional fiber has the fiber alignment near long side direction LD, with a plurality of peristomes 3 peripheral part separately of connecting portion 4 adjacency, have than side area 8 more horizontal directional fibers (second directional fiber), this horizontal directional fiber has the fiber alignment near width WD.
Above-mentioned formation also can obtain effect, the effect identical with first embodiment.That is, the menses by a plurality of convex shaped parts 2 do not accumulate in second 522 side yet, move to absorber parts 503 unobstructedly.Especially, middle section 9 passes through the menses than side area more than 8 owing to fibre density is low, and it is guided to absorber parts 503 unobstructedly.And, though the fibre density of side area 8 is high owing to be not the state of filming, therefore can not make the user have foreign body sensation or with the sensation variation of contact skin.
And therefore slot part 1, is fit to permeation liquid and solid owing to form a plurality of peristomes 3.And, because the fiber 101 on slot part 1 bottom to width WD orientation, therefore, can prevent that liquid from flowing, spreading to the long side direction LD of slot part 1 too much in large area.
And because the fibre density of a plurality of convex shaped parts 2 side area 8 separately is than middle section 9 height, therefore, rigidity increases.Therefore, a plurality of convex shaped parts 2 are supported by each side area 8, convex form be not easy because of external pressure etc. by conquassation.And, can prevent convex form because of the weight that contains liquid in a large number by conquassation.
And as mentioned above, there be the wherein a kind of of more vertical directional fiber (first directional fiber) and horizontal directional fiber (second directional fiber) in any part on a plurality of peristomes peripheral part separately.The shape that keeps peristome 3 like this, easily.
2-2-1. shape is selected grey cloth from basis application (revising a little)
Suitably with reference to Fig. 1 and Fig. 9 to Figure 11, the shape of the nonwoven fabric 110 that uses with regard to top flat parts 502 is specifically described.For nonwoven fabric 120, when the one side side by having the supporting units support fiber assembly that can make the part that fluid described later passes through, the fiber that constitutes this fiber assembly are in the state with free degree, spray mainly the fluid that forms by gas and a part of fiber of this fiber assembly is moved to this fiber assembly, form a plurality of peristomes 3 that contain in a plurality of slot parts 1, a plurality of convex shaped part 2 and the convex shaped part 2 thus.
Nonwoven fabric 120 is in first 521 side of this nonwoven fabric 120, roughly equally spaced form a plurality of slot parts 1 abreast along long side direction LD, and, form a plurality of peristomes 3 at this slot part 1.These a plurality of peristomes 3 are elongated circle or ellipse substantially substantially.In addition, also can consider the formation of circular.At this, in the present embodiment, slot part 1 roughly equally spaced forms side by side, but is not limited to this, but for example also each form differently at interval, and the interval variation ground between the slot part 1 is formed.And peristome 3 roughly equally spaced forms, but is not limited to this, also can form on different interval ground.
Except the peristome on the nonwoven fabric 120 3, a plurality of slot parts 1 are identical with the nonwoven fabric 110 of above-mentioned first embodiment with the particular content of a plurality of convex shaped parts 2 shape separately, therefore omit and specify (with reference to the 1-2-1. shape).
Connecting portion 4 between the convex shaped part 2 that forms connection and this slot part 1 adjacency between a plurality of peristomes 3 on the nonwoven fabric 120.In other words, a plurality of connecting portions 4 connection convex shaped parts 2 and the convex shaped part 2 that is adjacent that also can say so and form with predetermined distance.
The length of the long side direction LD of each peristome 3 and the length of width WD for example all are 0.1 to 5mm, and preferably 0.5 to 4mm.And, for example be 0.5 to 30mm across the spacing of the adjacent peristome 3 of connecting portion 4, preferably 1 to 10mm.
The height to the thickness direction TD of nonwoven fabric 120 on the connecting portion 4 for example is equal to or less than the height of convex shaped part 2 at the thickness direction TD of nonwoven fabric 120, and preferably 20 to 100%, 40 to 70% is better.
And each connecting portion 4 for example is 0.1 to 5mm in the length of the length of the long side direction LD of this nonwoven fabric 120 and width WD, and preferably 0.5 to 4mm.And the spacing across between the summit of the adjacent connecting portion 4 of peristome 3 for example is 0.5 to 30mm, and preferably 1 to 10mm.
The section shape of connecting portion 4 on the long side direction LD of this nonwoven fabric is quadrangle roughly.In addition, the section shape of connecting portion 4 on long side direction LD be not limited to roughly quadrangle, also can be cheese, trapezoidal, triangle, Ω shape etc.But, for the diffusion of liquid on slot part 1 that suppresses to stipulate, quadrangle roughly preferably.And, for prevent too high depress outward, connecting portion 4 contacts with skin etc. and foreign body sensation is arranged, the end face of this connecting portion 4 is plane or curved surface preferably.
2-2-2. fiber alignment
Suitably the fiber alignment of the nonwoven fabric 120 that uses with reference to Fig. 1 and Fig. 9 to Figure 11, with regard to top flat parts 502 describes.Except 3 peripheries of the peristome on the nonwoven fabric 120, a plurality of slot parts 1 are identical with the nonwoven fabric 110 of above-mentioned first embodiment with the particular content of a plurality of convex shaped parts 2 fiber alignment separately, therefore omit and specify (with reference to the 1-2-2. fiber alignment).
Slot part 1 is a direct injection fluid (for example hot blast) and forming, and, be the zone that forms peristome 3 and connecting portion 4.If it is to fiber 101 direct injection fluids, when then injected part caves in to thickness direction, on injected part, injected near side area 8 sides to the vertical directional fiber of long side direction LD orientation.And, changed the fluid of its flow direction by fluid and the non-ventilative portion that is injected into support component described later, injected to the horizontal directional fiber of width WD location near connecting portion 4 sides.Like this, the fiber 101 on the connecting portion 4 of slot part 1 specifically is to the width WD of integral body orientation to the direction that the long side direction LD with this slot part 1 reports to the leadship after accomplishing a task.Therefore, the fiber 101 on the periphery of peristome 3 is along the opening shape orientation.
On nonwoven fabric 120, the containing ratio of the vertical directional fiber of the connecting portion 4 of slot part 1 is minimum, and the containing ratio of horizontal directional fiber is the highest.The connecting portion 4 of slot part 1 is identical with slot part 1 on the nonwoven fabric 110 of first embodiment, and the containing ratio of horizontal directional fiber is 55 to 100%, is preferably 60 to 100%.
2-2-3. fiber density
To shown in Figure 11, the average fiber density of convex shaped part 2 is adjusted to the average fiber density that is higher than slot part 1 as Fig. 9.The adjustment of such fibre density is identical with above-mentioned first embodiment.Can pass through various condition frees such as the amount of fluid (for example hot blast) or tension force and adjust the fibre density of convex shaped parts 2.
The fibre density of the connecting portion 4 on the slot part 1 for example is 0.005 to 0.20g/cm 3, be preferably 0.007 to 0.10g/cm 3In the fibre density of connecting portion 4 less than 0.005g/cm 3Situation under, cause convex shaped part 2 by conquassation if apply excessive external pressure, this connecting portion 4 is too by conquassation sometimes.
On the other hand, in the fibre density of connecting portion 4 greater than 0.20g/cm 3Situation under, there is connecting portion 4 in the standard solution volume that drops on slot part 1, excessive external pressure is applied on this nonwoven fabric 120, with situation that skin directly contacts under, damp is arranged sometimes.
And, make the spatial area rate of measuring from first 521 side of nonwoven fabric 120 be lower than this nonwoven fabric 120 of spatial area rate ground formation of measuring from second 522 side of this nonwoven fabric 120.At this, the spatial area rate refers to not exist the ratio of the spatial area and the gross area of fiber.And the measuring method of spatial area rate is as follows.
The digital microscope VHX-100 that measuring instrument uses Keyemce Co., Ltd. to make.At first (1) longitudinally is fixed on sample on the measuring instrument making on the observation platform to become along the direction of slot part 1 and convex shaped part 2, (2), carry out following measurement respectively from the face of the opposition side of the raised face of the outstanding face of convex shaped part 2 and convex shaped part 2 on the summit of convex shaped part 2.
(3) suitably the lens multiplying power of setting measurement instrument and the multiplying power on the PC picture are with the fiber of side in face of the sample in focus of lens the most close (dispose brokenly in face of outstanding fiber).Then, (4) suitably set the photography degree of depth (depth), make the 3D rendering of sample.
(5) 3D rendering is converted to the 2D image,, specify in the space between the fiber in its scope the volume complanation of setting.(6) the 2D image is carried out binary system and handle, the position that has fiber is formed white, non-existent position is formed black, then, (7) counter-rotating color forms the position that does not have fiber white, measures the area behind the whitening.
At this, in this measurement, with multiplying power set 300 for, the degree of depth of will photographing is set at 200 μ m (per 20 μ m take once, take altogether 11 times), n=10 ground is measured, employing mean value.
In addition, the spatial area rate is calculated as described below.
Spatial area rate (%)=(the space gross area (mm 2)/measurement category area (mm 2)) * 100
At this, utilize (enlargement ratio during the space gross area during measurement/measurements) gross area between clearancen at last, and utilization (enlargement ratio during the measurement category area during measurement/measurement) can be calculated the measurement category area.
The spatial area rate is high more, and fiber spacing is exactly the surperficial thick meaning of nonwoven fabric from big more, and therefore, fiber is movable easily, free degree height.And, for by opening processing etc. and a part of fiber spacing from the nonwoven fabric that enlarges, the spatial area in each space is big, like this, in the injection on the nonwoven fabric on whole of fluid, fiber spacing is from expansion.Therefore, for example this nonwoven fabric is being used under the situation of absorbent commodity etc., the resistance of the integral body the when liquid that can reduce regulation such as excreta sees through this nonwoven fabric 120 moves liquid easily to absorber etc.
At this, the spatial area in each space is meant the gross area in the space that within the limits prescribed, does not have fiber and the ratio that does not have the space number of fiber.Can utilize following formula computer memory area.
Spatial area (mm 2/)=the space gross area (mm 2)/space number (individual)
From the spatial area rate of the planar survey of the 2 outstanding sides of this convex shaped part on the convex shaped part 2 be 5 to 100% for example from difference with the spatial area rate of the planar survey of the opposition side of the raised face of this convex shaped part 2, be preferably 5 to 80%, 15 to 40% better.
And, be 50 to 100% from the spatial area rate of the planar survey of the outstanding sides of convex shaped part 2, be preferably 50 to 90%, 50 to 80% better.
And, for example be 3000 μ m from the spatial area in each space of the planar survey of the outstanding sides of convex shaped part 2 2More than, be preferably 3000 to 30000 μ m 2, 5000 to 20000 μ m 2Better.
2-2-4. fiber weight per unit area
The average weight per unit area of fiber of nonwoven fabric 120 integral body is identical with the average weight per unit area of fiber of nonwoven fabric 110 integral body of first embodiment.And the relation of convex shaped part 2 and the average fiber weight per unit area of slot part 1 also with identical (with reference to the 1-2-4. fiber weight per unit area) of the nonwoven fabric 110 of first embodiment
The fiber weight per unit area of connecting portion 4 for example is 5 to 200g/m 2, be preferably 10 to 100g/m 2Fiber weight per unit area at this connecting portion 4 is lower than 5g/m 2Situation under, cause applying excessive external pressure convex shaped part 1 by the situation of conquassation under, this connecting portion 4 is too by conquassation sometimes.Fiber weight per unit area at connecting portion 4 is higher than 200g/m 2Situation under, there is connecting portion 4 in the standard solution volume of falling slot part 1, be applied on this nonwoven fabric 120 at excessive external pressure, with situation that skin directly contacts under, damp is arranged sometimes.
2-2-5. other
On the physiological napkin that the nonwoven fabric 120 of above-mentioned second embodiment is used as the top flat parts, also can obtain with the nonwoven fabric 110 of first embodiment as the identical action effect of the physiological napkin 501 of top flat parts use (with reference to 1-2-5. other).Especially, owing to form a plurality of peristomes 3, therefore, be fit to see through liquid and solid (molecule etc.) at slot part 1.Peristome 3 can prevent that liquid from flowing, spreading to the long side direction LD of slot part 1 too much with the connecting portion 4 to width WD orientation in large area.
2-2-6. manufacture method
Figure 12 is that the fiber web of Fig. 6 is under by the state of gas permeability supporting units support, the side gas jet is come the state diagram of shop drawings 9 to nonwoven fabric shown in Figure 11 upward.Below, suitably with reference to Fig. 6 and Fig. 8, the method for just making the nonwoven fabric 120 of present embodiment describes.At first, the fiber web 100 of Fig. 6 is placed on upper face side as the support component 220 of gas permeability support component.In other words, support component 220 supports fiber web 100 from downside (second 522 side).
As described in above-mentioned first embodiment, utilize the mechanism of Fig. 8, will support the state support component 220 down of fiber web 100 of Fig. 6 as 200 uses of gas permeability support component.That is, support component 220 is moved to prescribed direction (F),, can make the nonwoven fabric 120 of present embodiment by the upper face side continuous injection gas of the fiber web 100 that moves from this.
Above-mentioned support component 220 for example has ventilative portion and non-ventilative portion, and ventilative portion is that the fluid that sprays from the upper face side of the fiber web 100 of Fig. 6 (first 521 side) can the opposition side that is provided with fiber web 100 sides on support component 220 be that downside is ventilative; Must ventilative portion be that the fluid that sprays of the upper face side from fiber web 100 is ventilative to the downside of support component 220, and the fiber 101 that constitutes fiber web 100 can not move to the opposition side on the support component 220.
Above-mentioned ventilative portion is the hole portion 213 (with reference to Figure 12) by the mesh that forms of mesh-supported parts 210 of regulation.Above-mentioned non-ventilative portion for example is the formation that equally spaced is arranged side by side on mesh-supported parts 210 as the elongate parts 225 of non-ventilative portion.Can suitably change shape or setting as the elongate parts 225 of non-ventilative portion.And non-ventilative portion also can form by filling and leading up as the formed hole of the mesh-supported parts 210 of ventilative portion portion 213 (for example scolding tin, resins etc.).
Air permeability on the ventilative portion zone for example is 10000 to 60000cc/cm 2Min is preferably 20000 to 50000cc/cm 2Min.But,,, therefore, might form the air permeability more than the above-mentioned numerical value because this metallic plate convection cell does not have resistance for example forming under the situation of ventilative portion by connecting metallic plate etc. as the gas permeability support component.
Because constitute mesh-supported parts 210 and elongate parts 225 restriction fibers 101 side shifting below support component 220 of support component 220, therefore, fiber 101 moves towards the direction above support component 220.The gas that is ejected on the elongate parts 225 changes flow direction to the direction along these elongate parts 225.Like this, the gas that has changed flow direction make the fibers 101 that are arranged on above the elongate parts 225 above elongate parts 225 towards periphery the zone move.Like this, form regulation shaped aperture portion 3.And, one or more of orientation, density or the weight per unit area of adjustment fiber 101.
In addition, in order to form nonwoven fabric 120, also can use the support component different with above-mentioned support component 220 with peristome 3.By employed support component, can change the size of slot part 1, convex shaped part 2, peristome 3 and connecting portion 4 and arrangement etc.
3. absorbent properties evaluation
Utilize artificial menses, measure wetting-out rate, rate of drying, liquid residue, the diffusion area of artificial menses, finally estimate liquid refluence rejection to the top flat parts.Use top flat to adopt the physiological napkin of nonwoven fabric 120 structures of second embodiment.And, utilize existing two kinds of physiological napkins arbitrarily, carry out evaluation same as described above as a comparison.In addition, make absorber on each physiological napkin that evaluation is used, comparative evaluation is used, that covered by top flat roughly have identical performance.
3-1. evaluation method summary
An amount of artificial menses are dropped on each physiological napkin that evaluation is used, comparative evaluation is used repeatedly.Like this, when dripping, measure artificial menses at every turn, estimate the liquid immersion speed and the rate of drying of top flat from the time that top flat has permeated.And, by measuring the hot translational speed Q of topsheet surface Max, the liquid residue of evaluation top flat.And the range of scatter of the artificial menses by measuring topsheet surface is estimated the diffusion area of liquid at top flat.
3-2. measuring appliance
As the measuring appliance class that above-mentioned evaluation method is used, carry out following preparation.The Finger Robot Thermo LabKES-F7 that automatic titrator 725 types, perforate acrylic compounds plate (having hole, length * wide=200mm * 100mm, the weight 125g of 40mm * 10mm in central authorities), カ ト-テ Star Network company that balance, scale, artificial menses, Switzerland Wan Tong company produce produces, filter paper (length * wide=50mm * 35mm, 10 covers, measure weight A[g in advance]), acrylic compounds plate (long * wide=200mm * 100mm, weight 130g), weight (with the combination of aforesaid propylene acids plate, the size of filter paper formation per unit area 50g/cm relatively 2).
3-3. evaluation order
Each prepares the physiological napkin of five evaluation objects or comparison other.Below on the physiological napkin of identical type, utilize the measuring appliance class of above-mentioned (3-2.), according to 1) measure respectively five times to a series of evaluation order shown in the 9-b, estimate its mean value.
1) perforate acrylic compounds plate is overlapping in the mode that any middle body of the top flat of the perforate of perforate acrylic compounds plate and ready physiological napkin coincide.2) make ozzle contraposition above distance acrylic compounds plate 10mm of automatic titrator.
3-a) to the top flat that exposes from the hole of the acrylic compounds plate for the first time artificial menses (speed of dripping: 95ml/min, the amount of dripping: 3ml) of dripping.3-b) will begin in a minute after dripping and measure artificial menses in the perforate that is trapped in the acrylic compounds plate from time (wetting-out rate) that topsheet surface has been permeated.3-c) from artificial menses from the Measuring Time that will begin in a minute after topsheet surface has been permeated, measure the time of judging from the mobile end of top flat inside absorber downwards (rate of drying).In addition, judge artificial menses 60 seconds with the interior situation that can not finish to move under, be judged as moist (among Figure 13 described later *).3-d) perforate acrylic compounds plate is pulled down from top flat.
4-a) dripped one minute after, utilize KES-F7 to measure the most surperficial liquid residue (the hot translational speed Q of top flat Max).4-b) utilize scale to measure the range of scatter (diffusion area) of the most surperficial artificial menses of top flat.4-c) with above-mentioned 1) similarly the acrylic compounds plate is placed on once more on the top flat and (prepares the artificial menses that drip for the second time).
5-a) drip for the first time artificial menses through after 1.5 minutes, with above-mentioned 3-a) for the second time artificial menses (speed of dripping: 95ml/min, the amount of dripping: 4ml) of similarly dripping.5-b) with above-mentioned 3-b) similarly measure wetting-out rate.5-c) with above-mentioned 3-c) similarly measure rate of drying.5-d) with above-mentioned 3-d) similarly pull down perforate acrylic compounds plate.
6-a) with above-mentioned 4-a) similarly measure Q Max6-b) and 4-b) similarly measure diffusion area.6-c) with above-mentioned 1) similarly the acrylic compounds plate is placed on once more on the top flat and (prepares to drip for the third time artificial menses).
7-a) drip for the second time artificial menses through after 1.5 minutes, with above-mentioned 3-a) the artificial for the third time menses (speed of dripping: 95ml/min, the amount of dripping: 3ml) of similarly dripping.7-b) with above-mentioned 3-b) similarly measure wetting-out rate.7-c) with above-mentioned 3-c) similarly measure rate of drying.7-d) with above-mentioned 3-d) similarly pull down perforate acrylic compounds plate.
8-a) with above-mentioned 4-a) similarly measure Q Max8-b) with above-mentioned 4-b) similarly measure diffusion area.
9-a) drip for the third time artificial menses, 10 filter paper are set, the acrylic compounds plate is overlapped on 10 filter paper at the middle body arbitrarily of top flat through after 1.5 minutes.Weight is placed on the acrylic compounds plate.9-b) at above-mentioned 9-a) state under place after 1 minute, dismantle weight and acrylic compounds plate are measured the weight B[g of filter paper].The weight A[g of the filter paper before use] deduct B[g] (wetting amount again), calculate the wettability power again of the artificial menses of every 10ml according to following formula, estimate liquid refluence inhibition.
Wettability power (%)={ (B-A) g/10ml) } * 100 again
Figure 13 is that expression is about from above-mentioned 1) to 9-b) each physiological napkin of using with, comparative evaluation with regard to above-mentioned evaluation of the measurements and calculations of a series of evaluation order respectively carry out the figure of each average result (evaluation) (reference average one hurdle) five times.As mentioned above, be the physiological napkin of formation that has adopted the nonwoven fabric 120 of second embodiment as the physiological napkin of the present embodiment of estimating usefulness.Compare with the comparative example 1,2 of existing physiological napkin arbitrarily, the physiological napkin of present embodiment about the wetting amount again (0.27g) of estimating liquid refluence rejection and wettability power again (2.7%), obtain extraordinary result, obtained very high evaluation.
And, though do not illustrate, at above-mentioned 9-a) in, replace filter paper and acrylic compounds plate, make artificial leather at 50g/cm 2Pressurization placed 1.5 minutes down.Afterwards, handle, wetting areas is again estimated by carrying out binarization to the relative filter paper of vestige of the artificial menses of filter paper transfer printing from this artificial leather.The evaluation of wetting areas again, the physiological napkin of present embodiment are 350 to 400mm 2, and comparative example 1,2 is 1300 to 1450mm 2, can find out that the physiological napkin of present embodiment is good significantly.
The physiological napkin that above evaluation has used top flat to adopt the nonwoven fabric 120 of second embodiment to constitute, but the physiological napkin that the nonwoven fabric that uses nonwoven fabric 110 formations that adopted first embodiment constitutes is compared with each physiological napkin that comparative evaluation is used, also the evaluation result that can obtain.
Based on above-mentioned evaluation, according to absorbent commodity of the present invention, be used for the nonwoven fabric (120 or 110 etc.) of top flat parts 502 the application of the invention of the skin contact of physiological napkin, liquid permeability can and liquid refluence rejection brought into play good effect.That is, first 521 side (skin side) of top flat parts 502 is from needless to say, and liquid also is not easy to accumulate on second 522 side (with the contact side of absorber), can be promptly to the absorber side shifting.And, even owing to form and to apply external pressure, convex shaped part and be not easy yet, therefore, not changed by user's action or, can eliminate make dirty skin or sticking z z z discomfort through the influence of blood volume by the structure of conquassation.
4. the 3rd embodiment
Figure 14 is that absorbent commodity of the present invention is the pie graph of disposable diaper.The top flat parts 603 as absorber parts 602 of the disposable diaper 601 of the 3rd embodiment use the nonwoven fabric 302 identical with the nonwoven fabric 110 of first embodiment.In addition, nonwoven fabric 302 also can use the nonwoven fabric identical with the nonwoven fabric 120 of second embodiment.Such disposable diaper 601 also can obtain identical effect, the effect with explanation hereto.
As mentioned above,, can provide as being used for the top flat (surface patch) of skin contact according to the present invention, liquid permeability can and liquid refluence rejection obviously improve and have a concavo-convex nonwoven fabric of not only having paid high strength but also not made contact skin sense variation.Like this, can provide the absorbent commodity that satisfies high performance requirements.Especially, under the situation that can be provided under the situation of draining menses repeatedly or seat etc. exerted pressure with contact skin or for the variation of taking action, can eliminate the absorbent commodity of skin or sticking z z z discomfort of making dirty significantly.

Claims (7)

1. absorbent commodity has: at least a portion be liquid permeability first chip part, opaque liquid second chip part and be arranged on described first chip part and described second chip part between the absorber parts,
At least a portion of described first chip part is made of the nonwoven fabric with a plurality of protuberances and a plurality of recesses, and a plurality of protuberances are formed extended at both sides towards first direction first; A plurality of recesses on described first with described a plurality of protuberances second direction side separately and described first direction quadrature in abutting connection with, be formed extended at both sides to described first direction,
The fibre density of described a plurality of protuberance side area separately is roughly the same at the thickness direction of described nonwoven fabric, and, have the fibre density that is higher than the average fiber density on this protuberance,
The fibre density of the middle section that the thickness of described a plurality of protuberance ratio side area separately is big is roughly the same at the thickness direction of described nonwoven fabric, and, have the fibre density that is lower than described average fiber density,
Constitute described a plurality of recess separately the average weight per unit area of fiber of bottom be lower than the average weight per unit area of the fiber that constitutes described a plurality of protuberances described middle section separately.
2. absorbent commodity as claimed in claim 1 is characterized in that, the fiber of this nonwoven fabric of formation of described nonwoven fabric has along first directional fiber of described first direction orientation with along second directional fiber of described second direction orientation,
At described a plurality of protuberances, described first directional fiber of described side area is more than described middle section.
3. absorbent commodity as claimed in claim 2 is characterized in that, any recess in described a plurality of recesses is arranged between the first adjacent protuberance and second protuberance in described a plurality of protuberance, and comprises a plurality of peristomes and connecting portion,
A plurality of peristomes form along described first direction with the interval of regulation;
Connecting portion between described a plurality of peristomes, connect described first protuberance and described second protuberance,
Described second directional fiber of described connecting portion is more than described side area.
4. absorbent commodity as claimed in claim 3 is characterized in that, and is more than described connecting portion with described first directional fiber of described a plurality of peristomes peripheral part separately of described side area adjacency,
More with described second directional fiber of described a plurality of peristomes peripheral part separately of described connecting portion adjacency than described side area.
5. absorbent commodity as claimed in claim 1 or 2 is characterized in that, at described a plurality of protuberances, and described middle section more than described side area to the thickness direction fibers inclined.
6. absorbent commodity as claimed in claim 2 is characterized in that, constitute described a plurality of recess separately the bottom fiber described second directional fiber than the formation described middle section fiber many.
7. absorbent commodity as claimed in claim 1 or 2, it is characterized in that, for described nonwoven fabric, by had to the one side side supporting units support that can make the part that fluid passes through, fiber is on the fiber assembly of the state with free degree and sprays the fluid that is mainly formed by gas, a part of fiber of described fiber assembly moves, and forms described a plurality of recess and described a plurality of protuberance thus.
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CN2007800183424A Expired - Fee Related CN101448992B (en) 2006-06-23 2007-06-06 Absorbent, multilayered absorbent, and absorbent article
CN2007800172082A Expired - Fee Related CN101443500B (en) 2006-06-23 2007-06-06 Multilayer nonwoven fabric and process for producing the same
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CN2007800183424A Expired - Fee Related CN101448992B (en) 2006-06-23 2007-06-06 Absorbent, multilayered absorbent, and absorbent article
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CN2007800182686A Active CN101448989B (en) 2006-06-23 2007-06-08 Nonwoven fabric

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CN101448989B (en) 2011-12-07
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CN101443502A (en) 2009-05-27
CN101448992B (en) 2012-01-11
CN101448991A (en) 2009-06-03
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CN101443499A (en) 2009-05-27
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MY147444A (en) 2012-12-14
CN101448991B (en) 2011-05-25
CN101542032A (en) 2009-09-23
CN101473081A (en) 2009-07-01
CN101443499B (en) 2011-05-25
CN101448992A (en) 2009-06-03
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TW200813281A (en) 2008-03-16
CN101443502B (en) 2011-12-07

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