US 20060008187 A1
A reclosable bag having a bag interior and a bag opening, the bag interior comprising: a sealing section; an air-flow section configured to permit air flow through the air-flow section; and an air access interface positioned between the air-flow section and the sealing section, and configured to permit fluid communication therebetween; the bag further comprising: an openable closure configured and positioned to open and close the bag opening, the sealing section being positioned between the closure and the air-flow section; and a valve configured and positioned to permit air to be removed from the bag interior through the valve so as to create a negative pressure in the bag interior relative to an exterior of the bag; the sealing section being configured such that, when there is the negative pressure and the closure is closed, air is blocked from leaking from the exterior through the closure and sealing section to the air-flow section.
1. A reclosable bag having a bag interior and a bag opening, the bag interior comprising:
(a) a sealing section;
(b) an air-flow section configured to permit air flow through said air-flow section; and
(c) an air access interface positioned between the air-flow section and the sealing section, and configured to permit fluid communication therebetween;
the bag further comprising:
(i) an openable closure configured and positioned to open and close the bag opening, the sealing section being positioned between the closure and the air-flow section; and
(ii) a valve configured and positioned to permit air to be removed from the bag interior through the valve so as to create a negative pressure in the bag interior relative to an exterior of the bag;
the sealing section being configured such that, when there is said negative pressure and the closure is closed, air is blocked from leaking from said exterior through said closure and sealing section to the air-flow section.
2. The reclosable bag according to
wherein said sealing section has a length comprising the minimum distance between said closure and said air-flow section,
and wherein said length is selected to prevent air flow from said exterior through said closure and sealing section to said air-flow section when said closure is closed and said bag interior has a negative air pressure.
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This invention relates to the general field of containers, and more particularly to multi-purpose and specialty storage bags.
Bags are universally used and recognized as convenient, versatile, lightweight, and low cost containers. Bags having recloseable openings are useful to provide better security for their contents and for storage purposes. Such bags also have the benefit of better protecting perishable or sensitive contents, or alternatively, protecting the environment from contamination by contents that are toxic or dangerous.
A common closeable bag configuration has two rectangular panes of plastic film joined along three sides, with an opening left on one side, usually the top. A reclosable opening or zipper can be constructed on the open side by forming an interlocking strip on opposing panes, for example, by tongue and groove portions. The bags may be conveniently closed by pinching the panes together, so the tongue snaps into the groove, and opened by prying the panes apart.
In some cases a slider is added to facilitate opening and closing of the bag. A slider is a separate, usually molded, plastic piece that fits over and around the edge of the panes forming the bag opening so that it can slide along the strip. The slider is usually configured to apply an inward pinching pressure to urge opposing panels to join or interlock, and also to include a separator or finger that traverses the bag opening. With this configuration, closing the bag involves pushing the slider in a closing direction, and opening the bag involves moving the slider along a reverse, opening direction.
In many applications such as storage of food, liquids, or biological waste, it is desirable to form an airtight or leakproof seal of the closed bag. However, for bags having sliders, the separator or finger part of the slider usually traverses the opening, which prevents the formation of an airtight seal. In one attempted solution, Blythe, U.S. Pat. No. 6,526,632, shows a slider which lifts the separation member out of the bag opening by rotating the slider upwardly at the closed end. This device however is more complicated than the conventional slider, which adds cost, and also apparently depends on use of a customized counterpart fastener 12.
Another desirable feature, particularly for perishable contents, is the ability to remove residual air from the interior of the closed bag. A common practice by users of household storage bags, for example, is to first close the bag almost all the way, leaving a small portion open. The bag is then squeezed to vent the residual air out through the small opening, after which the user tries to quickly close the small opening before air can re-enter the bag. This informal method however is generally inconvenient and produces inconsistent results. It is also awkward, particularly for individuals with poor motor skills.
Some attempts have been made to construct a closeable bag with a built-in facility for air removal. For example, Minica, U.S. Pat. No. 6,045,264, shows a bag having an open top divided into a main opening and a smaller evacuation opening. The latter opening is configured to include a suction conduit for use in removing residual interior air. Strong, U.S. Pat. No. 5,839,582, shows a bag having a bow-shaped pump chamber with a suction port and a one-way valve. When the bag is closed, the pump chamber can be compressed to push air out through the one-way valve. Herrington, U.S. Pat. No. 4,532,652, shows an extending portion adhering to a hole in one of the film side panels. Squeezing the bag causes the extending portion to separate from the side panel, permitting air to escape through the hole. Thereafter, the extending portion returns to its position covering the hole, preventing further outflow of interior air.
All of these devices require modification to the standard storage bag, which increases cost. In addition, the bags shown do not use a slider, which may be due to the difficulty of forming an airtight seal with a slider.
A related problem is that the configuration of the panes of the bag can affect the degree to which an airtight seal can be achieved. Where the bag is formed from panes that are both flat or smooth, the panes can stick together over at least a portion of the pane area and block any applied suction from reaching the bottom portions of the bag. This could leave air bubbles trapped in the bag. One attempted solution is to use a ribbed pane, so that air channels are created between the ribs that reach deeper parts of the bag. However, there is still a problem in that the negative pressure formed inside the bag due to removal of air creates a tendency to pull or draw ambient air back into the bag interior through the closed zipper at the top of the bag. It can therefore be very difficult to create and maintain an airtight vacuum inside a closeable bag.
What is desired is a reclosable bag which overcomes one or more of the problems associated with such prior art bags.
Preferably, the bag should be easy and convenient for the user to close. In particular, it would be preferable if the bag could be configured to make use of a slider, which facilitates a strong air tight seal and the opening and closing thereof. A strong seal better maintains the freshness of perishable contents, and better protects the environment from toxic contents. The bag will also preferably be configured so that after it is closed the user can conveniently remove residual air, gas, or fluids from the bag interior, or alternatively, fill the interior with gas or fluid without disturbing the air-tight seal.
To keep costs low, the bag will preferably be capable of manufacture by conventional production techniques, using standard materials and components. The bag will preferably be suitable for production as a general purpose storage bag or as a commercial container for drinks and other items. Another preferable feature would be for the bag's closeable opening characteristic to be changeable. In this way, instead of the usual configuration where one side of the slider opens the bag and the other side closes the bag, the bag opening could be made, for example, to stay closed on either side of the slider as the slider is moved. This feature could enable greater flexibility in producing closeable bags that more closely meet the needs of different applications. It would also be preferable for the bag to effectively hold liquids, and to have a feature that prevents inadvertent spilling. The bag will also preferably enable an airtight vacuum to be formed and maintained within its interior, such as upon the application of suction to remove gas or air inside the bag.
Accordingly, there is provided a reclosable bag having a bag interior and a bag opening, the bag interior comprising:
Reference will now be made, by way of example only, to preferred embodiments of the invention as illustrated in the attached figures.
The closeable bag of the present invention is shown in
The closeable bag includes a means for selectively opening and closing the bag opening. The means for opening and closing generally comprises two elements—opposed interlocking features 18 along the bag opening 16, and a slider 20. The slider 20 is positioned in the bag opening 16, between the opposed interlocking features 18, and is generally movable along at least a portion of their length. The slider 20 is further configured so that as it moves, it causes the portion of the opposed interlocking features 18 that it passes to engage or disengage.
The closeable bag 10 is configured so that when the slider is in the position shown in
The bag portion 12 of the present invention comprehends any structure that provides the function of a container or a bag. More specifically, the bag portion 12 defines the bag interior 14, which is a space inside the bag with a capacity to receive various contents for deposit.
The bag opening 16 represents an area or space through which access may be obtained to the bag interior 14. Depending on the application, the bag contents may be deposited or retrieved through the bag opening 16. The bag opening 16 is preferably formed by an unsealed or unconnected seam of the material used to form the bag portion 12, but may also be formed by a cut, slit, incision, gap, hole, or other break anywhere on the surface of that material. The position of the bag opening 16 may accordingly be along an edge, interface, or seam of two or more pieces of the bag material, or along a top, bottom, side, diagonal, or other section of the material.
As shown in a preferred embodiment of
The bag portion 12 also preferably includes a support feature 33 adjacent to the bag opening 16 on an exterior part of the bag. The support feature 33 may take the form, for example, of a ridge, ledge, bulge, or similar protrusion. In the bag of
It can be appreciated that other embodiments of the bag portion 12 are possible as long as they define a bag interior 14 capable of holding contents, and a bag opening 16 to provide access to the bag interior. Some examples of alternative embodiments include a bag portion 12 formed from a single piece of spherical material having no panes or seams, as shown in
The bag portion 12 is preferably formed from a material sufficiently dense to contain air, gas, liquid, or other fluid contents without leakage, and sufficiently strong to hold the expected contents without tearing. The material should preferably be water resistant so as not to lose structural strength from contact with liquids. For these reasons bags made of plastic or polyethylene have been found to be adequate. Depending on the application, other materials such as film, laminate, or coated or treated paper may also provide adequate results. The bag material is preferably smooth, but may also be made laminated. Laminations are sometimes preferable, particularly in larger bags, since they can can provide channels for the movement of air flow inside the bag interior 14.
To retain the flexibility characteristic of bags the material should also preferably be pliant or elastic. The degree of flexibility in the material can be varied according to the application. However, it is preferable that there be at least sufficient flexibility so that the part of the bag portion 12 that defines the perimeter of the bag opening 16 can be pulled or drawn together by a user, to effectively close the bag opening 16.
The bag 10 of the present invention is generally configured to be closed or sealed everywhere on its surface and at all seams and edges except for bag opening 16, which can be selectively opened or closed. Therefore, closing bag opening 16 has the effect of completely enclosing bag interior 14 and closing the bag 10. The bag 10 may be designated alternately as “closeable” or “recloseable”, in each case meaning that the bag can be repeatedly opened and closed.
In the preferred embodiment of
The interlocking features 18 represent any configuration which will enable the opposed panes of the bag portion 12 to engage when the panes are brought together or in close proximity, to close bag opening 16, and also comprehend any configuration which will enable the engaged panes to disengage when the panes are drawn or pulled apart, to re-open bag opening 16. The interlocking features 18 should preferably be sufficiently robust in design and composition to enable repeated opening and closing within the expected lifespan of the bag 10 without experiencing undue loss in the strength of the engaged portions. In addition, the interlocking features are preferably sized and shaped to form a seal when engaged. In this way, fluid contents in the bag interior 14, for example, would not leak out of the bag through the engaged interlocking features.
A preferred type of interlocking feature 18 comprises mechanical elements which interlock through an interference or snap fit, such as by one feature sliding, pressing, or snapping inside the other feature. Such an arrangement is commonly described as a “tongue and groove” or “male and female” configuration, with the inner piece being the tongue or male portion and the outer piece being the groove or female portion.
The preferred arrangement shown in
The slider 20 is preferably an independent piece or element separate from the bag portion 12.
With reference to
It can be seen through the hidden view of
The handles 40 provide support to keep the slider 20 in place or attached to the bag 12, and also provide a handle, grip, or contact for the user to hold when moving the slider. The handles 40 preferably attach to or extend from the slider body 38 at or near the top 42, and extend outwards to either side and downwards towards bottom 44 to some extent. It is also preferable for the bottom of the handle to extend inwards towards the body 38, to create a support ledge 52. In
It can be appreciated that the handles 40 include both an inside portion that faces the sides 46 of the slider and an outside portion that faces away from the sides 46 of the slider. The outside portion provides a surface which may be grasped by a user to hold or move the slider 20. Accordingly, the handles 40 and in particular the outside portion of handles 40 are preferably sized and shaped to provide a comfortable and secure gripping surface. This may include, for example, in panel 54, an indentation in the surface or the use of a rubber material with nodules to provide a more effective grip.
The handles 40 are also preferably sized and shaped so that the inside portion generally follows the contour of the sides 46 of the slider. In the preferred embodiment of
The slider 20 is also preferably configured so that the separation or gap distance between the sides 46 of the body 38 and the inside portion of the handles 40 will be approximately the thickness of the individual panels 30 and 32, along the bag opening 16, of the bag portion 12. More preferably, the separation or gap distance will be slightly greater than the bag panel thickness, so that there will be sufficient space for the bag panels to be inserted and fit between the slider body 38 and handles 40, while maintaining a close and secure connection.
The side rails 56 are preferably positioned in the middle of the body 38, equidistant from the top 42 and bottom 44. The side rails 56 are also preferably formed by carving the desired feature, whether tongue or groove, out of the side 46 so that side 46 maintains a flat or flush profile.
The side rails 56 generally extend the length of the sides 46, but vary in configuration according to which end, 48 or 50, is being approached. End or edge 50 is highlighted in
Similarly, end or edge 48 is highlighted in
Opening edge 50 can be made to form a straight vertical edge. However, as shown in
Slider 20 also preferably includes the passageway 26, which is an aperture or hole extending the full height of the slider from top 42 to bottom 44.
The slider 20 is preferably made from a polyethylene or plastic material. Plastic is preferred because it is relatively strong, lightweight, water resistant, and low cost. A further advantage of plastic is that it can be made relatively easily into a complex shape like the slider 20. This can be accomplished, for example, through the standard production technique of injection molding, using a standard mold designed to conform to the shape of the slider 20. Plastic is also a preferable slider material to use when the bag portion 12 is plastic, so that the various components can be more easily integrated. It can be appreciated that other materials are also comprehended by the present invention as long as they possess some or all of the above properties. Other possible materials for the slider may include, for example, metal, alloy, or wood.
In forming the bag 10 of the present invention, the body 38 of the slider 20 is placed inside the bag opening 16 so that sides 46 are positioned between the opposed faces of front feature 34 and back feature 36. As shown in
On the inside of the bag, the side rails 56 of the slider mate or slidably engage with the opposed interlocking features 18 of the bag portion 12. With respect to the embodiment of
On the outside of the bag, it can be seen that the handles 40 of the slider are sized and shaped to conform to or snugly fit with the external support feature 33 of the bag portion 12. In particular, the handles 40 wrap around support feature 33 so that the bottom of support feature 33 rests on support ledge 52 of the handles 40. It can be appreciated that other embodiments of these elements are also possible as long as the handles provide a means for securing the slider to the outside of the bag portion 12. For example, the particular shapes of the support feature 33 and handles 40 can vary as long as they continue to conform to one another to form a close, snug fit. Similarly, other types of attachment besides a mechanical fit are also possible, such as for example, a magnetic connection between the inside of the handles 40 and the opposing external edge of the bag portion 12 or support feature 33.
It can be appreciated that the combination of the interlocking elements inside the bag and the close fit of the handle around the external support feature 33 closely hold the slider 20 to the bag portion 12. In particular, the slider 20 is attached so that it cannot fall into the bag interior 14 or inadvertently pop out of the open top. Short of a determined and forceful effort, the slider 20 will resist most attempts to be separated or removed from the bag portion 12.
The slider 20 is sized and shaped to engage the interlocking features 18, or alternatively, to disengage the interlocking features 18, as the slider is moved along the bag opening 16. More specifically, the configuration of edges 48 and 50 of the slider 20 determine whether a given portion of bag opening 16 will engage or disengage as the slider moves in a particular direction.
Turning to the preferred embodiment of the closeable bag 10 shown in
More particularly, in
The joining and separating function of the slider 20 can be understood by tracing the path of the interlocking features 18 through edges 48 and 50 of slider 20. As shown in
Conversely, when the slider 20 moves towards end 22, the portion of the opposing features 34 and 36 that pass through trailing edge 50 will be unable to engage due to the termination of the side rails 56 on either side of separating edge 50. Further, the inner portion of handle 40 only follows the contour of sides 46 to a point short of separating edge 50. There is no need for the inner portion of handle 40 to extend all the way since it is not desired to press the interlocking features together at separating edge 50. As a result, while the opposing features 34 and 36 will approach one another as the contour of slider 20 narrows towards edge 50, as they slip off the side rails 56 they will remain apart since there is no guide or track on the slider side rails or outside pressure from the handles 40 to keep them together.
It can be appreciated that other open/close characteristics of the closeable bag 10 can be achieved by modifying the construction of the slider 20. For example, instead of having both a joining edge 48 and a separating edge 50, the slider 20 could be made with two joining edges 48. In this case the bag opening 16 would remain closed for its entire length, on both sides of the slider, for any position of the slider. Alternatively, if the slider is constructed with two separating edges 50, no part of the bag opening 16 would close.
The closeable bag 10 is configured to produce an airtight seal in the bag interior 14 when the bag opening 16 is fully closed. As shown in
The interlocking features of the present invention are preferably sized and shaped to form a seal when engaged. In particular, the tongue feature 34 and groove feature 36 are preferably sized and shaped to form an airtight seal when they interlock or snap-fit together. Accordingly, with the slider 20 in the position shown in
The slider 20 is configured to seal the bag opening 16 when positioned at one end of said bag opening. Slider 20 is accordingly preferably configured to produce a seal all around its perimeter. At the point where closed portion 15 meets joining edge 48, the interlocking features 18 are squeezed closely together, both from the inward pressure of the close-fitting handles, and to connect with side rails 56. In this way the airtight seal is maintained at the interface of the interlocking features 18 and the slider. Along the sides 46 of the slider the airtight seal is maintained due to the snap fit between side rails 56 and interlocking features 18. Accordingly, side rails 56 are preferably sized and shaped to produce an airtight fit or engagement with interlocking features 18. At the interface of separating edge 50 and end 24 of the bag 10, the airtight seal is achieved by configuring the slider 20, and in particular separating edge 50, so that it is complementary to the shape of bag opening 16 at end 24. In the preferred embodiment of the bag 10, the edge 50 of the slider has a “V” shape which complements and fits closely into a similar “V” shape in bag opening 16 at end 24. Separating edge 50 preferably also includes the projection or jutting portion 64. As shown in the side view of
It can be appreciated that other shapes of the slider 20 and bag portions 12 may also be used, as long as the shapes of the slider tip and end of bag opening 16 are sufficiently complementary to form a close and snug fit. It can also be appreciated how the present invention improves on the prior art. Sliders used in the past usually contain a separator or finger to separate or pry apart the panes. The separator is usually configured to fulfill this function, and not to form a complementary fit with a bag opening. Such sliders cannot usually seal a bag opening in the ordinary course since the separator prevents the slider from completely closing the bag opening.
In order to maintain the airtight seal once the slider has reached the end 24, it is preferable for there to be a latch or other means to hold the slider 20 in place and prevent it from falling back. This may be achieved in the present invention by means of a detent, which is a catch or lever that locks the movement of one part of a mechanism. Detents can be placed anywhere along the slider 20 or the bag portion 12.
In the preferred embodiment of
It can be appreciated that other embodiments for latching of the slider are possible, as long as the slider 20 is prevented from falling back and a good seal is maintained. For example,
The passageway 26 is configured to provide access between the bag interior 14 and outside area 28 whether the bag opening 16 is open or closed. In the preferred embodiment of the invention, passageway 26 is preferably inside or integrated with slider 20. Since the slider is positioned between interlocking features 18, it can be appreciated that access between bag interior 14 and outside area 28 through passageway 26 will be unaffected even when the bag opening 16 is closed and sealed airtight. The passageway 26 is sized and shaped to provide access to passage of a fluid, such as a gas or a liquid, or solid matter such as particulates or powder.
The passageway 26 is also preferably sized and shaped to accept a fluid transmission conduit 74 such as a pipe, tube, or common straw. A general representation of a tube 74 is shown in
The passageway 26 preferably contains a means for opening and closing the passageway, or valve 80, as shown in
The valve 80 will preferably be a one-way valve, meaning that when the valve is in an open state fluid will be permitted to flow in one direction only. For example, the one-way valve could be configured to permit access or fluid flow from the bag interior 14 out of the bag to outside 28, and to block fluid passing from the outside 28 to the bag interior 14. This type of valve would be useful for removing air from a bag used to store food or other perishable contents, for example. Alternatively, the one-way valve could be configured to permit access or fluid to flow in the other direction only, from the outside 28 of the bag into the bag interior 14, and to block fluid from passing from the bag interior 14 to the outside 28. This type of valve would be useful for an application in which it is desired to inject into the bag a special gas or liquid that preserves or protects the bag contents, such as for example, using formaldehyde to preserve a biological specimen.
The bag 10 of the present invention comprehends the use of almost any type of valve 80 to achieve a desired flow characteristic through the passageway 26. For example, the valve 80 could be a two-way type instead of one-way. A two-way valve is a valve having two open states, in which one state permits flow in one direction and the other state permits fluid flow in the other direction. Activation of a particular state might arise simply from use of the valve. For example, squeezing the bag 10 might force air out of the bag interior 14, through the valve 80 towards the outside 28 of the bag. Alternatively, a tube could be coupled to the passageway 26 containing the same valve and pressure applied to force a liquid into the bag. In this state, the valve would permit fluid flow in the opposite direction from the first use, from the outside 28 to the bag interior 14. Alternatively, the two-way valve 80 could be configured so that the permitted direction of flow is set through a switch on the valve itself, or preferably, on the surface of the slider 20.
The valve 80 may be configured so that when it is in an open state the passageway 26 will be substantially or completely open, so that fluid passing through the passageway will be able to flow at an optimum high rate. Alternatively, the valve 80 may be configured to partially close the passageway 26 to any degree desired.
It can be appreciated that valves are generally configured for installation in a passageway or tube located inside a solid body. Therefore, many types of standard valves are similiarly amenable for installation in the passageway 26 of the present invention, since the passageway 26 is preferably located inside the solid body of the slider 20. A common type of valve suitable for use in the passageway 26 of the present invention is a ball valve, which is generally represented as valve 80 in
The present invention comprehends use of the slider 20 without an integral passageway 26. It can be appreciated that since the slider 20 is configured to open and close the bag opening 16, and to form an airtight seal when in a completely closed position, a bag 10 made with the slider 20 may be useful even without the passageway 26. For example, the bag 10 could be filled with a liquid and the slider closed to form an airtight seal, preventing leakage of the liquid. When the liquid contents are to be used, the slider could be pushed open slightly and the liquid poured out. Such a bag 10 would have the advantage of being easy to open and close, due to the slider 20, and also provide the benefit of an airtight seal to better preserve perishable contents or hold liquids.
The present invention also comprehends separating the passageway 26 from the slider 20. Such an arrangement is preferably realized using an access element 82 to contain or integrate with the passageway 26. The access element 82 is generally a body positioned between two edges or panes of the bag 10, and that contains the passageway 26 and valve 80. The access element 82 may be sized and shaped similar to slider 20, or it may have any other size and shape as long as it can be positioned between two edges of the bag 10. The access element 82 is preferably fixed in position. This may be accomplished, for example, by sealing the panes 30 and 32 around the sides of the access element 82.
In one embodiment, the two edges of the bag 10 may be two edges of opposed panels 30 and 32 that define bag opening 16. In that case, the sides of access element 82 could be sealed between opposing panes 30 and 32 in a variety of ways known in the art. The bag 10 might also be made without interlocking features 18 around access element 82, since the features 18 would not be needed to support slider movement in that portion of bag opening 16. This embodiment is illustrated in
It can be appreciated that where the access element 82 is fixed, the use of the passageway 26 to access the bag interior 14 will not be affected by the particular positioning of access element 82 in the bag 10. Accordingly, in a further embodiment the two edges of bag 10 could be two edges of opposed panels 30 and 32 that do not define bag opening 16. This would generally comprise the perimeter of the bag 10 other than that portion occupied by bag opening 16. In
In this embodiment it is preferable that access element 82 be located between opposing panes or edges of the bag 10 that are joined, welded, or seamed together. Such an arrangement simplifies manufacturing of the bag 10, since the access element 82 could be placed between the panels, which would wrap around the access element. The panels would be welded or sealed together as before, with the access element 82 sealed between them. Where the two opposing panels are joined by a fold, installation of the access element would be less convenient since a hole would need to be made. For example, if the bag 10 in
The preferred embodiment of the present invention can now be understood as the case where access element 82 is the slider 20. This embodiment is preferred since a bag having only one body, comprising a slider with an integrated passageway, is generally less costly and more efficient to produce and use than a bag having two bodies comprising an access element and slider.
A common type of bag production involves joining two rectangular panes along three sides, or along opposing sides of a single folded pane, leaving a bag opening 16 open on one side. A zipper having opposed interlocking features 18 can be separately produced and attached to the bag opening 16. A slider may be inserted over the zipper in the bag opening 16 during production so that it is movable along the bag opening 16 without being removable from the bag itself. The standard production equipment also generally operates at a high cycle or production rate, which results in lower cost.
The bag portion 12 of the bag 10 of the present invention similarly can be made from one or two panes of plastic joined along two or three sides, leaving a bag opening 16. The interlocking features 18 along the bag opening 16 can similarly be produced using standard production techniques, such as by attachment of a zipper, as described above. The slider 20 of the present invention is configured as an independent body capable of production by standard injection moulding techniques. Therefore, while the slider 20 is different from the prior art sliders in form and function, it can still be manufactured at a similar low cost. Moreover, the standard production equipment for producing bags and installing sliders can be used to produce the bags 10 of the present invention. In production, movable sliders 20 would be laid down in the bag opening 16, and separate access elements 82 would be installed, if desired, either in the bag opening 16 or along a joint or seam between panes prior to the panes being sealed.
It can be appreciated therefore that the bag 10 of the present invention can be produced for about the same low cost or competitive with conventional slider bags that lack the other benefits of the present invention. The material costs for the bag and slider are similar to conventional bags, and the production equipment is the same or usable with only slight modification. Moreover, since standard production equipment may be used, the industry standard high cycle rates of such equipment may continue to be applicable. It can be further appreciated that this represents an improvement over the prior art. Since prior art devices generally require unconventional bags and valves, both the bag and valve materials and production equipment generally are non-standard and need to be custom made. Further, cycle rates are likely to be lower, which increases the cost of each bag.
In practice, the degree of airtightness provided by zippers or opposed interlocking features 18 will vary. An embodiment of a reclosable bag 10 having improved airtightness characteristics, particularly when used with lesser quality zippers, is shown in a top view in
As shown in the figures, at the top of the bag 10 there is a bag opening 16 having an openable closure or opposed interlocking features 18, configured and positioned to open and close the bag opening. A movable slider 20 is not shown along bag opening 16, but may be included if desired. Also shown is an access element 82 fixed in position along the side 84 of the bag. The access element includes a passageway 26, valve 80, and fluid transmission conduit 74. When the bag opening 16 is closed, access to the bag interior 14 is provided by access element 82, or more particularly, by passageway 26 and valve 80 of access element 82. The access element 82 is accordingly configured and positioned to permit air to be removed from the bag interior, through the passageway and valve, so as to create a negative pressure or vacuum in the bag interior relative to an exterior of the bag.
The bag 10, and corresponding bag interior 14, include two sections: an air-flow or ribbed section 92, and a sealing or flat section 94. The air-flow section 92 is generally configured to permit air flow through the air-flow section.
The air-flow section 92 is defined by opposing panes 30 and 32 that are sized and shaped so that when the panes are in contact, at least one channel or conduit is available inside bag interior 14 to permit air to flow through the interior of section 92. As shown in
The air-flow section 92 is preferably constructed from a flat pane and an opposing ribbed pane, however two opposing ribbed panes may also be used. It can also be appreciated that three or more panes may also be used, as long as the function of providing air flow in the section 92 is maintained. The opposing panes may be any shape, but are preferably rectangular in accordance with common bag configurations. As shown in
The sealing or flat section 94 is positioned between the closure and the air-flow section, and is generally configured such that, when there is negative pressure in bag interior 14 and the closure is closed, air is blocked from leaking from the outside or exterior of the bag through the closure and sealing section to the air-flow section. The sealing section generally comprises at least two opposing panes 30 and 32 that are sized and shaped so that when the panes are in contact, passage of air through the sealing section is blocked. Each of the panes in this section preferably have a flat or smooth surface. The opposing panes may be any shape, but again are preferably rectangular. The rectangular panes are preferably closed or joined on two sides to partly define sides 84 and 86 of bag 10, and open on the other two opposing sides. One of the open sides preferably attaches to the air access interface 93, to join and enable fluid communication between section 94 and air-flow section 92, and the other open side defines bag opening 16.
The access element 82 is preferably positioned in the sealing section 94 between the panes on one of the closed sides 84 and 86. The access element 82 is preferably adjacent to the air access interface 93, and most preferably within one-half inch of the air access interface 93. In this way, there is fluid communication between the passageway and valve of the access element 82 and the air-flow section, through the sealing section. Suction that is applied through passageway 26 and valve 80 will be largely transmitted to air-flow section 92, and not be unduly reduced due to the sealing or blocking effect of sealing section 94. The access element 82 may also be positioned between the panes on one of the closed sides 84 and 86, or the bottom 88, of the air-flow section 92. This configuration however is less preferred because of the risk of contamination of the access element 82 from the contents of the air-flow section.
As shown by the symbol “L” in
In particular, it has been found that for better quality or more airtight zippers, a sealing section length of at least 1⅛ inches produces substantially better airtightness results. For generally lower quality or less airtight zippers 18, a sealing section length of at least 3¼ inches produces substantially better airtightness results. Bags having lengths “L” within this range, of at least 1¼ inches, 1½ inches, 1¾ inches, 2 inches, 2¼ inches, 2½ inches, 2¾ inches, and 3 inches are also preferred.
The bag 10 of
In an alternative embodiment, the zipper 18 may further include an extended portion that comprises, or integrally includes, the sealing section 94. Generally the zipper 18 is a plastic element produced by an extrusion process. Accordingly, the extrusion process may be modified so that the bottom portion of the zipper 18 extends the full length of the sealing section 94. The extended portion will most preferably be at least 1⅛ inches in length, but may also preferably be at least 1¼ inches, 1½ inches, 1¾ inches, 2 inches, 2¼ inches, 2½ inches, 2¾ inches, 3 inches, and 3¼ inches in length. In this embodiment of the bag 10, while the zipper 18 element will be more costly, production of the bag 10 would be simplified since a connection or weld would no longer be required between the zipper and sealing section 94.
The operation of the present invention can now be described, using as an example the reclosable bag 10 configured as a household storage bag as shown in
At this point the bag will be sealed airtight, but may contain residual air in the bag interior 14. The user can then exchange air or fluid between the bag interior 14 and the outside 28 of the bag through the passageway 26 in the recloseable bag opening 16. The removal of air or fluid from the bag interior 14 may be achieved, for example, by inserting the insertion end 76 of the hollow tube 74 into the passageway 26 and applying suction to the free end 78. In a consumer application, the hollow tube 74 will preferably be a straw and the suction applied by the user's mouth. The valve 80 in this example will preferably be a one-way valve permitting fluid to flow in the direction from the bag interior 14 to the outside 28. Upon removal of all or substantially all of the air in the bag interior 14, the tube 74 may be removed from the passageway 26, and the bag 10 placed in storage. In another embodiment, instead of using a hollow tube 74, the bag 10 may be squeezed to force residual air out of the bag interior 14 through passageway 26. This method could also be performed with the embodiment shown in
It can be appreciated that the method of closing a bag of the present invention represents an improvement over the prior art. In the prior art the user would ordinarily close the slider close to end 24, leaving a small opening 17. The bag would be squeezed to force residual air out through opening 17. Then, the user would close the slider with one hand while usually keeping the other hand pressed against the bag, to prevent the inflow of air during the period that the slider is being closed. Further, once the bag is closed, there is unlikely to be an airtight seal due to the presence of the separator or finger of the conventional slider in the bag opening. By contrast, in the present invention the user can force air out of the bag, by squeezing the bag, applying suction to hollow tube 74, or otherwise, and not be concerned about the possible inflow of air because any such air will be blocked by the valve 80. It can accordingly be appreciated that the method of closing a bag of the present invention is easier and more convenient than the conventional method, and further produces a more air free bag interior 14.
In another application of the present invention, the passageway 26 could be fitted with a valve 80 that permits fluid flow into the bag interior 14, while blocking flow in the opposite direction. Such a bag could be used in an industrial setting to receive a drinkable fluid or other fluid for commercial sale. For example, where the contents are a drinkable fluid the valve 80 could be made two-way, so the user could use a straw to retrieve the contents. Alternatively, a two body configuration as shown in
It can be appreciated that a variety of commercial bag configurations are made possible by the present invention. In particular, the parameters available to a designer of a bag 10 of the present invention include: the choice of which edges 48 and 50 to use for the slider, whether to use a single slider 20 or an additional access element 82 with one or two passageways between them, selection of the type of valve 80, and also whether to seal all or a portion of interlocking features 18. In addition, the designer can select a variety of bag shapes in addition to the standard two pane configuration.
The bag portions 12 may be produced using standard equipment for the types of bags shown in
An issue that could arise with a commercial drink package that is made from a soft material or used by children, for example, is inadvertent squirting of the contents upon pressure being applied to the sides of the bags. In the bags of
In yet another embodiment, a bag 10 could be made with a slider having two joining edges 48. The bag opening 16 would then always be closed on both sides of the slider 20. In a further variation, the slider could have the passageway 26 without a valve 80, so that the passageway is always open. The panes 30 and 32 could be sealed together below the slider 20 at every point except a small portion. Therefore, the bag 10 would be sealed for every position of the slider 20 except where the slider is positioned so that the passageway 26 is immediately above the open portion. The positioning of the slider would function as a valve in this embodiment, to open or close the passageway. In production the slider could be positioned first over the open portion to receive a nozzle into the passageway, to fill the bag with a drinkable fluid, for example. The slider could then be pushed to a side, to seal the contents during transport and storage. Upon purchase, the consumer would move the slider to the access position and insert a straw to drink the contents.
It will be appreciated by those skilled in the art that the foregoing description was in respect of preferred embodiments and that various alterations and modifications are possible within the broad scope of the appended claims without departing from the spirit of the invention. For example, while reference is made to a bag having one or two bodies, more bodies may also be used in a single bag where the application merits. Various other modifications will be apparent to those skilled in the art but are not described in any further detail herein.