WO2014097462A1

WO2014097462A1 - Extraction filter and extraction bag

Info

Publication number: WO2014097462A1
Application number: PCT/JP2012/083156
Authority: WO
Inventors: 亜希子宮脇; 充範斎藤
Original assignee: 大紀商事株式会社
Priority date: 2012-12-20
Filing date: 2012-12-20
Publication date: 2014-06-26
Also published as: WO2014098097A1

Abstract

The purpose of the present invention is to provide an extraction filter and an extraction bag for a beverage including a fine powder of a substance to be extracted such as green tea, with which discharge of the fine powder of the substance to be extracted is inhibited during non-extraction, e.g. during filling of the extraction bag with the substance to be extracted such as tea leaves, or during haulage of the extraction bags having been filled with the substance to be extracted and sealed, and with which discharge of an appropriate amount of the fine powder is caused during extraction. Accordingly, in this extraction filter, a thin-film sheet having, provided therein, cuts piercing a rear surface thereof is provided overlapping a coarse fibre sheet not having cuts provided therein. Furthermore, this extraction bag is provided with a bag main body formed using the extraction filter.

Description

Extraction filter and extraction bag

The present invention relates to a beverage extraction filter and an extraction bag, and more particularly to an extraction filter and an extraction bag suitable for extraction of a beverage containing a fine powder of an extractable material such as green tea exhibiting moderate turbidity.

Green tea, which is carefully extracted from high-quality tea leaves with hot water using a teapot, is known to have a high aroma, moderate bitterness and deliciousness. Moreover, the green tea carefully extracted in the teapot has a little turbidity because it contains fine powder of tea leaves, but the fine powder of tea leaves is said to be a factor in the taste of green tea.
However, extracting green tea using a teapot requires time and effort to dispose of the tea leaves after the extraction and washing the teapot. As a product that can extract green tea more easily, fiber filters such as natural fibers and synthetic fibers can be used. 2. Description of the Related Art An extraction bag generally called a tea bag, which is made by using a bag and filled and sealed with tea leaves, is known.

However, extraction with a conventional extraction bag has made it difficult to produce green tea that exhibits moderate turbidity as extracted with a teapot.
In other words, in order to impart turbidity to green tea, when extracting the green tea by immersing the extraction bag in hot water, an appropriate amount of tea leaf powder should be leaked and included in the green tea. As a filter, a method using a coarse filter can be considered. However, when a coarse fiber filter is used, the tea leaf fine powder leaks out through the coarse fiber filter during the process of filling the extraction bag with tea leaves or during the transportation of the extraction bag filled with tea leaves. In addition, the raw material is lost, the manufacturing apparatus for the extraction bag is soiled and causes a failure, and the tea bag product is not good-looking with a lot of fine tea leaves adhering to the outer peripheral surface of the extraction bag. The inconvenience arises.

Therefore, many of the commercially available extraction bags are made with fine fiber filters to prevent leakage of fine tea leaf powder, so it is difficult to extract green tea with moderate turbidity. It is.
From the above circumstances, when extracting green tea, tea leaf fine powder can be leaked and included in green tea, and when tea leaf is filled or transported, it can prevent leakage of tea leaf fine powder. Extraction filters and extraction bags are desired.

As a prior art relating to such an extraction bag, Japanese Patent Laid-Open No. 2006-143258 (Patent Document 1) discloses that a water-soluble polymer compound such as polysaccharides or gelatin is attached to a filter made of nonwoven fabric or the like. A tea bag filter is described in which the fiber gap is closed. This filter for tea bags can prevent leakage of fine tea leaf powder filled and sealed in the tea bag because the fiber gap is closed in the dry state before use. When immersed, the water-soluble polymer compound that has blocked the fiber gap of the filter is dissolved in hot water, so that the fiber gap of the filter is opened and the tea leaf fine powder can be leaked to the outside.
However, this tea bag filter has a problem that the water-soluble polymer compound adhered to the filter is dissolved in the beverage, which may impair the flavor of the beverage.

Japanese Patent Laid-Open No. 2009-60826 (Patent Document 2) discloses that a tea leaf fine powder having a controlled particle size is filled and sealed in a flat tea bag having a specific thickness, and a plurality of flat tea bags are provided. Flat tea bags that can be stored in a packaging bag so that the tea powder is not easily leaked from the tea bag during transportation, and if the tea bag is immersed in water during extraction, the tea powder can be leaked. And its packaging.
However, the technique described in Patent Document 2 presses the flat tea bags in surface contact with each other and suppresses the movement of the fine tea leaf powder in the tea bag, thereby reducing the fine tea leaf from the tea bag during transportation. For example, when filling tea leaf fine powder in the tea bag manufacturing process or when storing a tea bag filled with tea leaf fine powder in a packaging bag, it is necessary to reduce the leakage of powder. There is a problem that powder leakage cannot be prevented.

JP 2006-143258 A JP 2009-60826 A

Therefore, the present invention has been made in view of the above problems, and when an extraction bag such as tea leaves is filled in an extraction bag or when an extraction bag filled with an extraction bag is transported. Extraction of beverages that contain fine powder of the extract, such as green tea, that can prevent leakage of the fine powder of the extract when it is not extracted, but can leak an appropriate amount of fine powder during extraction An object is to provide a filter and an extraction bag.

Of the present invention that solves the above problems, the invention described in claim 1 of the present invention overlaps a thin film sheet that has been cut through the front and back with a coarse fiber sheet that has not been cut. It is a filter for extracting beverages containing fine powder of the extract.
In the present invention, the thin film sheet is a thin sheet made of a material that is difficult to pass through or does not pass through the fine powder of the extract such as tea leaves, for example, a sheet made of a fiber material such as woven fabric, nonwoven fabric, and paper. In addition, since the fiber gap is small, the fine powder of the extractable material that is liquid-permeable is difficult to pass through, or a synthetic resin film that is not liquid-permeable and does not allow the fine powder of the extractable material to pass through. It is a film-like sheet which uses as a raw material.
The coarse fiber sheet is a sheet made of fiber material such as woven fabric, non-woven fabric, paper, etc., and has a relatively large fiber gap, so that it has liquid permeability and allows fine powder of the extract to pass through. It is.

In the present invention, the thin film sheet is provided with notches penetrating the front and back. As described above, the material constituting the thin film sheet is difficult to pass through the fine powder of the extraction object, or does not pass at all, so if the notch is in a closed state, it is difficult for the fine powder to pass through the thin film sheet. However, if the cut is in an expanded state, the fine powder can easily pass through the expanded portion.
The filter for extraction of the present invention is an embodiment in which the thin film sheet and the coarse fiber sheet are simply overlapped and are not adhered to each other. Therefore, the coarse fiber sheet to which no cut is attached is in a state of being supported in light contact with the thin film sheet having the cut.
Therefore, since various physical actions applied to the thin film sheet from the outside are alleviated by the coarse fiber sheet, the cuts made on the thin film sheet can be maintained in a substantially closed state. For example, when the extraction filter of the present invention is manufactured, when a tensile force is applied by a conveying device or the like, the extraction bag is filled and sealed in the extraction bag made using the extraction filter, and the extraction filter is used. Even when the wall surface (extraction filter) of the bag is deformed, the cuts made on the thin film sheet are maintained in a substantially closed state.

In order to extract a beverage such as green tea with an extraction bag made using the extraction filter of the present invention, the bag body filled with an extraction object such as tea leaves is sealed in hot water or water. Then, hot water and water flow into the bag body and are absorbed by the extraction object. At that time, since hot water and water have large specific gravity and generate resistance, they pass while expanding the cuts in the thin film sheet. As a result, the notch is expanded. Therefore, the fine powder contained in the substance to be extracted floats in the hot water or water that has flowed into the bag body, and the hot water or water convects and flows out of the bag body again through the expanded cut. When you do, it will leak along with hot water and water.
In addition, since the comparatively big to-be-extracted substance which is not fine powder cannot pass a coarse fiber sheet, it does not leak from a bag main body irrespective of opening and closing of the cut | notch of a thin film sheet.

As described above, the extraction filter of the present invention is a beverage that has not been extracted, such as when an extraction bag is filled with an extract or when an extraction bag filled with the extract is transported. In some cases, it is possible to easily leak the fine powder during the extraction of the beverage, even though the leakage of the fine powder of the extract can be suppressed. Therefore, it is suitable as a filter for extracting beverages that contain fine powder of the extract, such as green tea that exhibits moderate turbidity.

Next, the invention described in claim 2 is a beverage extraction filter comprising fine powder of the extract according to claim 1, wherein the thin film sheet and the coarse fiber sheet are overlapped and partially bonded.
Partial adhesion between the thin film sheet and the coarse fiber sheet may be achieved by partially bonding the opposing surfaces of the two sheets overlapped by spotting or wire-attaching. It is desirable to arrange the cuts at positions and sizes that do not hinder the spread operation during beverage extraction. This is because, depending on the position and size of the bonding location, the degree of freedom of operation of the peripheral portion of the cut of the thin film sheet is hindered, and it may be difficult to expand the cut.

Thus, by partially bonding the thin film sheet and the coarse fiber sheet, both sheets are integrated, so that the strength of the extraction filter is improved compared to the case where both sheets are simply superimposed, It is easy to handle when making the extraction bag. Moreover, the support effect | action with respect to the thin film sheet of said coarse fiber sheet can be exhibited more strongly.
The method of partial adhesion between the thin film sheet and the coarse fiber sheet is not particularly limited. For example, in the case where both sheets are made of a thermoplastic resin material, the overlapping sheets can be partially welded by hot embossing. it can. It is also possible to perform partial adhesion by partially applying and pressing an adhesive between both sheets.

Next, the invention described in claim 3 is a beverage extraction bag including a powder body to be extracted, comprising a bag body formed using the extraction filter according to

claim

1 or 2. .
According to such an extraction bag, when the beverage is not extracted, such as when the extract is filled into the bag body or when the extraction bag is filled and sealed with the extract, the extract is finely powdered. In spite of being able to suppress the leakage of water, the fine powder can be easily leaked at the time of beverage extraction. Therefore, it is suitable as an extraction bag for beverages containing a fine powder of an extraction object, such as green tea that exhibits moderate turbidity.
In addition, the bag body of the extraction bag of the present invention does not necessarily have to be made entirely using the extraction filter of the present invention, and may be partially made of other filters. .

Next, the invention described in claim 4 uses the extraction filter according to

claim

1 or 2 and is a bag made by forming a thin film sheet on the inner surface side and a coarse fiber sheet on the outer surface side. It is a bag for the extraction of the drink containing the fine powder of a to-be-extracted object provided with a main body.
The back body of such an extraction bag is a coarse fiber in which a thin-film sheet with cuts is arranged on the inner surface side that comes into contact with an object to be filled and sealed in the bag body, and the outer surface side is not cut. Since the sheet | seat is arrange | positioned, the coarse fiber sheet is in the state which supports a thin film sheet | seat so that it may surface-contact lightly so that it may cover from the outer side.

Therefore, for example, when the beverage is not extracted, such as when the extraction bag is transported, some external force is applied to the bag body, and the thin film sheet disposed on the inner surface side is pressed against the filling and sealing object to be extracted. Even if it is deformed, the thin fiber sheet is supported by the coarse fiber sheet in contact with the surface from the outside, so the degree of deformation of the thin film sheet is mitigated, the notch is difficult to expand, and it remains almost closed Can do. Therefore, the leakage of the fine powder contained in the extract can be more effectively suppressed.

On the other hand, when a beverage is extracted using such an extraction bag, for example, when the bag body is immersed in hot water, the hot water flows into the bag body, but the thin film sheet on the inner surface side is a coarse fiber sheet on the outer surface side. Since it is located downstream from the inflow direction of hot water, it is difficult to receive a support action by the coarse fiber sheet. Therefore, since the cut of the thin film sheet is easily pushed out by the flowing hot water, the fine powder of the extraction object is easily leaked to the outside.
In addition, the extraction bag has a coarse fiber sheet on the outer surface that covers the thin film sheet on the inner surface side, so that it is difficult to see the cut of the thin film sheet from the outside. can do.

According to the filter for extraction according to claim 1, such as when filling the extraction bag into the extraction bag made using the filter, or transporting the extraction bag filled with the extraction bag, etc. When the beverage is not extracted, the fine powder can be easily leaked when the beverage is extracted, although the leakage of the fine powder of the extract can be suppressed. Therefore, it is suitable as a filter for extracting beverages containing a fine powder of an extract, such as green tea that exhibits moderate turbidity.

According to the filter for extraction according to claim 2, since the thin film sheet and the coarse fiber sheet are integrated by partial adhesion, the strength of the filter for extraction is improved, and when the bag for extraction is made, etc. Is easy to handle. Moreover, the support effect | action with respect to the thin film sheet of a coarse fiber sheet can be exhibited strongly.

According to the extraction bag described in claim 3, when the beverage is not extracted, such as when filling the body to be extracted or when carrying the extraction bag filled with the extraction object, Although the leakage of the fine powder of the extract can be suppressed, the fine powder can be easily leaked when the beverage is extracted. Therefore, it is suitable as an extraction bag for beverages containing fine powder of an extractable material such as green tea exhibiting moderate turbidity.

According to the extraction bag described in claim 4, when the beverage is not extracted, the coarse sheet supports the thin film sheet in surface contact from the outside, so that the incision of the thin film sheet is difficult to expand, and the fine powder of the extractables Can be effectively suppressed. On the other hand, at the time of beverage extraction, since the thin film sheet is not easily supported by the coarse fiber sheet, the cut of the thin film sheet can be easily expanded and the fine powder can be easily leaked. Therefore, it is suitable as an extraction bag for beverages containing a fine powder of an extract, such as green tea that exhibits moderate turbidity.

It is explanatory drawing showing the state at the time of non-extraction in one Embodiment of the filter for extraction of this invention. It is explanatory drawing showing the state at the time of non-extraction in one Embodiment of the bag for extraction of this invention. It is explanatory drawing showing the state at the time of extraction of the filter for extraction shown in FIG. It is explanatory drawing showing the state at the time of non-extraction in other embodiment of the filter for extraction of this invention. FIG. 5 is an explanatory diagram of a cross section taken along line AA of the extraction filter shown in FIG. 4. It is explanatory drawing showing the state at the time of extraction of the filter for extraction shown in FIG. It is explanatory drawing showing the form of the various cuts in the filter for extraction of this invention. It is explanatory drawing which shows the method of the extraction test by the bag for extraction of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The present invention is not limited to these embodiments.

First, an embodiment of the extraction filter 1 of the present invention will be described with reference to FIG.
The extraction filter 1 is an extraction filter suitable for extraction of beverages exhibiting moderate turbidity such as green tea, and the thin film sheet 2 and the coarse fiber sheet 3 are overlapped and formed in a long band shape. In FIG. 1, in order to easily understand the configuration of the extraction filter 1, the thin film sheet 2 and the coarse fiber sheet 3 are depicted as a rectangle and further shifted in an obliquely leftward direction.

Here, the beverage to be extracted by the extraction filter 1 is not limited to green tea, but includes a wide variety of foods and medicines for drinking. For example, the extraction filter 1 is suitable for extracting tea leaves such as black tea, hojicha, oolong tea, chuchucha, barley tea, flower tea, coffee powder, bonito and bonito, etc. Can be used widely.
In addition, when the beverage is green tea, delicious green tea that is moderately turbid contains tea leaf fine powder having a particle size of about 500 μm or less, and among them, a relatively large amount is about 150 to 500 μm. It is.

The thin film sheet 2 is a thin sheet made of a material that is difficult to pass or does not pass through fine powder such as tea leaves, and is constituted by a fine fiber sheet or a film-like sheet.
Further, the thin film sheet 2 is formed with a cut 4 penetrating the front and back. The cuts 4 of the present embodiment shown in FIG. 1 are X-shaped with a size that can fit into a grid with a side of 10 mm, and a large number of them are regularly arranged at almost equal intervals.

The fine fiber sheet constituting the thin film sheet 2 is a sheet made of a fiber material such as a woven fabric, a non-woven fabric, or a paper in which synthetic fibers or natural fibers are interwoven or entangled and formed into a thin sheet as a whole. The maximum pore diameter of the fiber gap is preferably 200 μm or less. This is because such a relatively small fiber gap can considerably suppress the passage of fine powder such as tea leaves.

For example, when the fine fiber sheet is a non-woven fabric, the fineness is preferably 4.0 denier or less, and the basis weight is 3 to 50 g / m 2 from the viewpoint of the function of suppressing the passage of fine powder such as tea leaves and the cost reduction. ² is preferred.
Examples of the material of the nonwoven fabric include polyolefin fibers such as polyethylene, polypropylene and copolymer polypropylene, polyester fibers such as polyethylene terephthalate, copolymer polyester and aliphatic polyester, polylactic acid, polybutylene succinate, polyethylene succinate and aliphatic. Short fibers or long fibers such as polyester or aromatic polyester biodegradable fibers can be used, and the sheath is made of polyethylene, polypropylene, copolymer polyester, aliphatic polyester, etc., and the core is made of polypropylene, polyethylene terephthalate, etc. A composite fiber having a core-sheath structure can be used.
Moreover, it does not specifically limit as a manufacturing method of this nonwoven fabric, The well-known spun bond method, the melt blow method, the needle punch method, the spun lace method, the airlaid method, the carding method etc. are applicable.

When the fine fiber sheet is a woven fabric, as a material of the woven yarn, a general long fiber for woven fabric can be used, but when extracting the extraction filter 1 into the extraction bag 5, From the viewpoint of heat seal and fusing seal properties, polyester fibers such as polyethylene terephthalate, copolymer polyester, and aliphatic polyester, polyolefin fibers such as polyethylene, polypropylene, and copolymer polypropylene, polylactic acid, aliphatic polyester, and aromatic polyester Biodegradable fibers of the system can be preferably used.
Further, monofilaments, multifilaments, core-sheath composite fibers in which two types of resins are combined, spun yarns, and the like can be used as the form of the woven yarn.

Next, the film-like sheet constituting the thin-film sheet 2 is a synthetic resin film formed by thinly extending a heat-melted synthetic resin or a synthetic fiber sheet such as a nonwoven fabric by hot pressing to form a fiber gap. Is a sheet made of a synthetic resin film or the like that is almost closed, and generally has no through-holes, and therefore does not allow liquid or fine powder such as tea leaves to pass through.
As a material for such a film-like sheet, a material excellent in hot water resistance is preferable. For example, polyolefin resins such as polyethylene, polypropylene and copolymer polypropylene, polyester resins such as polyethylene terephthalate, copolymer polyester and aliphatic polyester, polyamide Resin, polystyrene resin, polylactic acid / polybutylene succinate / polyethylene succinate / aliphatic polyester-based or aromatic polyester-based biodegradable resin can be used.

The thin film sheet 2 of the embodiment shown in FIG. 1 is a fine fiber sheet made of melt blown nonwoven fabric, the material is polyethylene terephthalate, the fineness is 0.6 denier, the basis weight is 5 g / m ² , and the maximum pore diameter of the fiber gap is 120 μm.
Further, the maximum opening diameter of the fiber gap in the present invention is a value measured by a bubble point method (JIS K 3832). Specifically, the sample is immersed in 2-propanol so that 2-propanol is contained in all the pores of the sample by capillary action, and then air pressure is gradually applied from the lower surface side of the sample. The gas pressure is measured when the pressure exceeds the liquid surface tension in the pores and bubbles are generated. Since the bubble is initially generated from the maximum aperture diameter portion, the maximum aperture diameter can be calculated by measuring the gas pressure at that time.

Next, the coarse fiber sheet 3 of the extraction filter 1 is a sheet made of a fiber material such as a woven fabric, a non-woven fabric, or a paper in which synthetic fibers or natural fibers are interwoven or entangled to form a thin sheet as a whole. In addition, since the fiber gap is relatively large, it has liquid permeability and allows fine powder such as tea leaves to pass through.
The maximum aperture diameter of the fiber gap of the coarse fiber sheet is larger than the maximum aperture diameter of the fine fiber sheet and is 150 to 500 μm, although it depends on the size of fine powder such as tea leaves to be passed. preferable.

In addition, the coarse fiber sheet 3 has a breaking strength necessary for making an extraction bag, and from the viewpoint of reducing the cost, when the coarse fiber sheet 3 is a woven cloth wrinkle, a fineness of 15 to The denier is preferably 40 denier and the basis weight is 10 to 40 g / m ^{2. When} the coarse fiber sheet 3 is a nonwoven fabric, the fineness is preferably 1.2 to 8 denier and the basis weight is 10 to 40 g / m ² .
As the material of the bag or the nonwoven fabric, the fine fiber sheet constituting the thin film sheet 2 and substantially the same synthetic fiber can be used. However, in order to obtain a high heat seal strength when an extraction bag is made. In addition, it is preferable to employ a material having good welding compatibility with the thin film sheet 2.
Moreover, if materials having different melting points are employed as the material of the thin film sheet 2 and the coarse fiber sheet 3, only the sheet having a low melting point is melted and functioned as an adhesive during the heat sealing process. Can be carried out easily and reliably.

The coarse fiber sheet 3 of the embodiment shown in FIG. 1 is a cocoon, the material of the weaving yarn is polyethylene terephthalate / low melting point polyester, the fineness is 25 denier, the basis weight is 21 g / m ² , and the maximum pore size of the fiber gap is 220 μm.

The extraction filter 1 shown in FIG. 1 is a mode in which the thin film sheet 2 and the coarse fiber sheet 3 are simply overlapped and are not adhered to each other. Therefore, the coarse fiber sheet 3 not provided with the cuts is in a state of lightly contacting and supporting the thin film sheet 2 provided with the cuts 4.
Therefore, since various physical effects applied from the outside to the thin film sheet 2 are alleviated by the coarse fiber sheet 3, the cuts 4 given to the thin film sheet can be maintained in a substantially closed state. For example, when a tensile force is applied by a conveying device or the like during the manufacture of the extraction filter 1, or the extraction bag 5 made by using the extraction filter 1 is filled and sealed with an extractable material for extraction. Even when the wall surface (extraction filter) of the bag 1 is deformed, the cut 4 given to the thin film sheet 2 is maintained in a substantially closed state.

In order to manufacture an extraction bag using such an extraction filter 1, for example, a continuous long extraction filter 1 is used as a raw fabric, and this is sequentially cut and joined by a known bag making and filling device, It can be manufactured by filling and sealing the extractables.

Next, an embodiment of the extraction bag of the present invention manufactured using the extraction filter 1 will be described with reference to FIG.
The extraction bag 5 is picked up with a fingertip when using the extraction filter 1 shown in FIG. 1 to form a tetragonal (tetrahedral) bag body 6 and the extraction bag 5. Tag 8 and a hanging thread 7 having one end bonded to one apex portion of the bag body 6 and the other end bonded to the tag 8.
The bag body 6 is formed by placing the thin film sheet 2 of the extraction filter 1 on the inner surface side and the coarse fiber sheet 3 on the outer surface side, and the bag body 6 has an object to be extracted (not shown). Is filled and sealed. In the embodiment shown in FIG. 2, tea leaves for green tea and fine powder of tea leaves are filled and sealed as the extract.

The bag making method of the bag body 6 is not particularly limited. For example, the extraction filter 1 in which a continuous long thin film sheet 2 and a coarse fiber sheet 3 are preliminarily stacked is used as a raw fabric, and this is used for filling a known bag. The apparatus may be used to form a bag by sequentially cutting and joining, and then filling and sealing tea leaves and tea leaf fine powder. Moreover, the continuous long thin film sheet 2 and the coarse fiber sheet 3 can be simultaneously set in the bag making and filling device, and the two sheets can be stacked to form a bag. Furthermore, the joining method at the time of bag making can be heat sealing, fusing sealing, ultrasonic sealing, high frequency sealing and the like.
Note that the form of the extraction bag 5 is not limited to that shown in FIG. 2. For example, the shape of the bag body 6 may be a pyramid shape or a flat bag shape. Also good.

Next, the function of the extraction bag 5 will be described with reference to FIGS.
As shown in FIG. 2, the bag body 6 of the extraction bag 5 has a coarse fiber sheet 3 disposed on the outer surface side and a thin film sheet 2 disposed on the inner surface side. The coarse fiber sheet 3 is in a state of supporting the thin film sheet 2 with the cuts 4 while lightly contacting the surface so as to cover from the outside.
Therefore, before use of the extraction bag 5, that is, before extraction of green tea, for example, some external force is applied to the bag body 6 during transportation, and the thin film sheet 2 on the inner surface side is pressed against the filled and sealed tea leaves. Even when the thin film sheet 2 is deformed, the coarse fiber sheet 3 supports the thin film sheet 2 from the outside. Therefore, the degree of deformation of the thin film sheet 2 is alleviated, and the notch 4 is difficult to expand and maintains a substantially closed state. obtain. Therefore, leakage of tea leaf fine powder can be effectively suppressed.
Further, in the extraction bag 5, since the coarse fiber sheet 3 on the outer surface side of the bag body 6 covers the thin film sheet 2 on the inner surface side, the cut 4 of the thin film sheet 2 is difficult to see from the outside. It is neat and beautiful.

In order to extract green tea using such an extraction bag 5, for example, holding the tag 8 with a fingertip, immersing the bag body 6 in a cup containing hot water for a few seconds to several minutes, and drinking from the tea leaves in the bag body 6 What is necessary is just to extract a component, and after extraction, the tag 8 should be lifted and the bag main body 6 should just be pulled up from a cup.
As described above, when the bag body 6 is immersed in hot water, the hot water flows into the bag body 6 and is absorbed by the tea leaves. At that time, since the hot water has a large specific gravity and causes resistance, the hot water is cut into the thin film sheet 2. By passing 4 while expanding 4, an expanded portion 9 as shown in FIG. 3 is formed. Therefore, the tea leaf fine powder floats in the hot water flowing into the bag body 6, and when the hot water convects and passes through the expanding portion 9 and flows out of the bag body 6 again, It will leak out.
Further, if the fingertip having the tag 8 is moved up and down to shake the bag body 6 in the hot water to cause turbulent flow in the hot water inside and outside the bag main body 6, more tea leaf fine powder can be leaked.
In addition, since the tea leaves larger than the tea leaf fine powder cannot pass through the coarse fiber sheet 3, they do not leak out from the bag body 6 regardless of opening and closing of the cuts 4 of the thin film sheet 2.

The extract to be filled and sealed in the bag body 6 of the extraction bag 5 is preferably a green tea leaf that is desired to exhibit moderate turbidity as described above, but is not limited thereto, and is a solvent such as hot water or water. It can be widely applied to foods and medicines that are extracted from and used for drinking.
In addition, when the extract is tea leaves for green tea, it is possible to use only general tea leaves that have been cut and dried to a size of a few millimeters to a few tens of millimeters, but increase the degree of turbidity of green tea. Therefore, in order to shorten the extraction time, a tea leaf fine powder produced separately may be added.

Next, another embodiment of the extraction filter of the present invention will be described with reference to FIGS.
The extraction filter 1 shown in FIG. 4 is formed in a long band shape by laminating a thin film sheet 2 and a coarse fiber sheet 3 as in the embodiment shown in FIG.
The thin film sheet 2 is the same melt blown nonwoven fabric as that of the embodiment of FIG. 1, but the cut 4 formed through the front and back is a straight line having a length of about 12 mm formed along the longitudinal direction of the extraction filter 1. It has a shape, and a large number are regularly arranged at almost equal intervals.
Moreover, the coarse fiber sheet 3 is also the same ridge as the embodiment of FIG. 1, and the thin film sheet 2 and the coarse fiber sheet 3 are partially bonded by the bonding portions 10 formed by hot embossing, which are a large number of spot welded portions. Has been. Such an adhesive portion 10 is arranged alternately with the notches 4 as shown in FIG. 4 and FIG. 5 which is a cross-sectional view taken along the line AA.

In the extraction filter 1 of this embodiment, since the thin film sheet 2 and the coarse fiber sheet 3 are partially bonded and integrated, the strength is high, and the mechanical suitability in the bag making process of the extraction bag 5 is improved. It is excellent and easy to handle.
Furthermore, since the notch 4 of the thin film sheet 2 is formed in a straight line shape along the longitudinal direction of the extraction filter 1, for example, in the bag making process of the extraction bag 5, the extraction filter 1 is in the longitudinal direction. , The incision 4 is unlikely to expand due to friction or catching with the conveyance path or due to a tensile force applied in the longitudinal direction of the extraction filter 1.

When the beverage is extracted using the extraction bag 5 formed by the extraction filter 1 shown in FIG. 4, the bag body 6 is immersed in hot water as in the embodiment of FIG. As a result, the hot water passes through the notch 4 of the thin film sheet 2 while being expanded, so that an expanded portion 9 as shown in FIG. 6 is formed. Therefore, the fine powder of the substance to be extracted floats in the hot water that has flowed into the bag body 6, and when the hot water convects, passes through the expanding portion 9, and flows out of the bag body 6 again, To leak.
In addition, since each adhesion part 10 which adheres the thin film sheet 2 and the coarse fiber sheet 3 partially is arrange | positioned sufficiently away from each notch 4, the expansion part 9 by the expansion operation of the notch 4 is provided. It does not inhibit formation. In addition, the position, size, shape, and the like of the bonding portion 10 can be changed as appropriate within a range that does not hinder the expanding operation of the cuts 4.

Next, the example of the form of the cut | notch 4 attached | subjected to the thin film sheet 2 of the filter 1 for extraction of this invention is demonstrated.
As described above, the simplest form of the notch 4 can be the X shape shown in FIG. 1 or the straight shape shown in FIG. 4, but is not limited thereto. For example, the form can be appropriately changed in order to adjust the amount of the fine powder of the extract to be leaked at the time of beverage extraction or to improve the design of the extraction bag.
Examples of such forms are shown in FIGS. 7 (a) to (e).
The notch 4 shown in (a) is a form in which three linear notches are combined in a radial shape.
The notch 4 shown in (b) is a form in which three linear notches are combined in an H shape.
The notch 4 shown in (c) is a waveform form represented by a curve.
The notch 4 shown in (d) is a waveform form represented by a straight line.
The notch 4 shown in (e) is a form in which long and short five linear notches are arranged in parallel.

<Production of Example Sample>
Example samples A and B of two types of extraction bags 5 were manufactured using the extraction filter 1 of the embodiment shown in FIG.
Here, the extraction filter 1 of the embodiment shown in FIG. 1 is obtained by overlapping the thin film sheet 2 and the coarse fiber sheet 3 without adhering to each other as described above. The thin film sheet 2 is a fine fiber sheet made of a melt blown nonwoven fabric. The material is polyethylene terephthalate, the fineness is 0.6 denier, the basis weight is 5 g / m ² , and the maximum opening diameter of the fiber gap is 120 μm. A large number of X-shaped cuts that are large enough to fit into a 10 mm side mesh that penetrates are regularly arranged. The coarse fiber sheet 3 is cocoon, the material of the weaving yarn is polyethylene terephthalate / low-melting polyester, the fineness is 25 denier, the basis weight is 21 g / m ² , and the maximum pore size of the fiber gap is 220 μm.

Samples A and B both have a tetra-shaped bag body 6 having a height of 50 mm, a hanging thread 7 having one end bonded to one apex of the bag body 6, and a tag 8 bonded to the other end of the hanging thread 7. The bag body 6 is filled and sealed with about 2 g of green tea leaves containing about 10% of fine powder having a particle diameter of 500 μm or less.
The difference between sample A and B is the configuration of the wall of the bag body 6, and the bag body 6 of sample A has the thin film sheet 2 with the cutout 4 of the extraction filter 1 disposed on the inner surface side, The coarse fiber sheet 3 that is not cut is placed on the outer surface side to make a bag. On the other hand, the bag body 6 of the sample B is placed on the inner surface side that is not cut. However, the thin film sheet 2 provided with the cuts 4 is disposed on the outer surface side and is formed into a bag.

<Production of comparative sample>
Example of the above extraction bag In place of the extraction filter 1 in the sample A, only the thin film sheet 2 provided with X-shaped cuts is used, and the other examples are the same as in the sample A. Sample C was made.
In addition, instead of the thin film sheet 2 provided with the X-shaped cut in the comparative sample C, the same thin film sheet is used except that no cut is provided, and the other is the same as the sample C, and the extraction bag Comparative sample D was prepared.
Further, in place of the extraction filter 1 in the example sample A, only the coarse fiber sheet 3 was used, and the other example of the extraction bag was prepared in the same manner as the sample A.

<Test example>
Example 1 A and B of the two types of extraction bags and three types of comparative samples C, D, and E as the first test, and the amount of leakage of tea leaf fine powder from the bag body 6 when not extracted A test was conducted to investigate.
The test method is to suspend the suspension thread 7 of each sample fixed to the vibration part of a sieve tester (manufactured by IKA Labortechnik, model HS501), apply 125 Hz vibration in a fixed direction for 3 minutes, and leak from the bag body 6 The mass of the tea leaf fine powder dropped was measured. The test results are shown in Table 1.

Next, as a second test, the same two kinds of example samples as the first test and three kinds of comparative examples are used to examine the leakage amount of the tea leaf fine powder from the bag body 6 at the time of green tea extraction. Went.
First, as shown in FIG. 8, the bag body 6 of each sample is immersed in a water tank (beaker) 11 containing 200 ml of hot water 12 having a temperature of 90 ° C., and the bag body 6 is rotated clockwise three times. Subsequently, the bag main body 6 was taken out from the hot water 12 after rotating counterclockwise three times and further shaking up and down 10 times. Next, the obtained green tea was observed with the naked eye, and the obtained green tea was further filtered to separate and collect the tea leaves and the tea leaf fine powder contained in the green tea, and the mass was measured after drying. The test results are shown in Table 1.

As is clear from Table 1, in Example Sample A, no leakage of tea leaf fine powder was observed when not extracted, and green tea exhibiting moderate turbidity was obtained during extraction, with the best results among all samples. there were.
Further, in Example Sample B, a slight leakage of tea leaf powder was observed when not extracted, but green tea exhibiting moderate turbidity was obtained during extraction, and there was no practical problem.
On the other hand, in the comparative sample C, a large amount of the mixture of tea leaves and tea leaves leaked both at the time of non-extraction and at the time of extraction, which was a very undesirable result.
Moreover, in the comparative sample D, tea leaf fine powder does not leak when unextracted and is good, but tea leaf fine powder leaks only slightly during extraction, and the obtained green tea is almost transparent and almost free of turbidity. This was an undesirable result.
Furthermore, in Comparative Example Sample E, the amount of leakage of tea leaf fine powder when not extracted was large, which was an undesirable result.

The present invention includes a fine powder of the extract that can suppress the leakage of the fine powder of the extract when the beverage is not extracted, and can extract an appropriate amount of the fine powder of the extract when the beverage is extracted. It is useful as a beverage extraction filter and an extraction bag.

DESCRIPTION OF SYMBOLS 1 Filter for extraction 2 Thin film sheet 3 Coarse fiber sheet 4 Cutting 5 Bag for extraction 6 Bag main body 7 Hanging thread 8 Tag 9 Expansion part 10 Adhesion part 11 Water tank (beaker)
12 hot water

Claims

A filter for extracting beverages containing fine powder of an extract, which is formed by laminating a thin film sheet with cuts penetrating the front and back and a coarse fiber sheet without cuts.
The filter for extracting beverages containing fine powder of the extract according to claim 1, wherein the thin film sheet and the coarse fiber sheet are overlapped and partially bonded.
A beverage extraction bag comprising fine powder of an extract, comprising a bag body made using the extraction filter according to claim 1 or 2.
3. Using the extraction filter according to claim 1 or 2, comprising a fine powder of an extract, comprising a bag body formed by placing a thin film sheet on the inner surface side and a coarse fiber sheet on the outer surface side. Beverage extraction bag.