REFERENCE REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable
SEQUENTIAL LISTING
Not applicable
BACKGROUND
1. Field of the Invention
The present invention relates to reclosable pouches, and more particularly, to reclosable pouches having closures that include two closure mechanisms.
2. Description of the Background
Reclosable pouches that have two closure mechanisms, each including opposing interlocking closure elements, are known. In one instance, a closure for a reclosable thermoplastic pouch includes first and second profile strips. One profile strip has two elongate male interlocking profiles extending from one side of a backing member. The other profile strip has two elongate female interlocking profiles extending from one side of another backing member. The entire backing member of each profile strip is laminated to a respective first or second pouch wall.
In another instance, a similar set of profile strips also includes a center post extending from the backing member between the male interlocking profiles and a bumper ridge disposed on opposite ends of each backing member. The bumper ridges and the center post allow the profile strips to be sealed to thermoplastic film across the widths of their respective backing members without crushing or distorting the interlocking members.
SUMMARY OF THE INVENTION
According to one embodiment of the present invention, a reclosable pouch includes a body portion having first and second opposing sidewalls and a first web having a first portion attached to the first sidewall and a first unattached portion. The first web is disposed on an internal side of the first sidewall. The reclosable pouch further includes a second web having a second portion attached to the second sidewall and a second unattached portion. The second web is disposed on an internal side of the second sidewall. Additionally, the reclosable pouch includes a first closure mechanism having first and second closure profiles with the first closure profile disposed on the first web at the first attached portion and the second closure profile disposed on the second web at the second attached portion. Furthermore, the reclosable pouch includes a second closure mechanism having third and fourth closure profiles with the third closure profile disposed on the first web at the first unattached portion and the fourth closure profile disposed on the second web at the second unattached portion.
According to another embodiment of the present invention, a zipper for a reclosable bag includes first and second closure profiles disposed between first and second internal walls. The first and second internal walls are attached to first and second opposing sidewalls, respectively, of a reclosable bag. The first closure profile is attached to the first and second internal walls opposite adjacent a point where the first and second internal walls are attached to the first and second sidewalls, respectively. The second closure profile is attached to portions of the first and second internal walls that are not attached to the first and second sidewalls.
According to yet another embodiment, a reclosable pouch includes a body portion having a sidewall and an opening into an interior. The reclosable pouch further includes a flange disposed on an internal side of the first sidewall. The flange has an attached portion secured to the sidewall and at least one unattached portion not secured to the sidewall. Furthermore, the reclosable pouch includes a first closure mechanism for resealably closing the opening. The first closure mechanism includes a first profile disposed on the flange. Additionally, the reclosable pouch includes a second closure mechanism for resealably closing the opening. The second closure mechanism includes a second profile disposed on the flange. At least one of the first and second profiles is disposed on an unattached portion of the flange.
Other aspects and advantages will become apparent upon consideration of the following detailed description, in which the same reference numbers indicate the same structures in the various embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view of a reclosable thermoplastic storage bag;
FIG. 2 is a cross-sectional view taken generally along the line 2-2 of FIG. 1 depicting a closure mechanism according to a first embodiment with portions behind the plane of the cross-section omitted for clarity;
FIG. 3 is a partial cross-sectional view similar to FIG. 2 depicting an opening operation of the closure mechanism of FIG. 2;
FIG. 4 is a partial cross-sectional view taken generally along the line 2-2 of FIG. 1 similar to FIG. 2 depicting a closure mechanism according to another embodiment;
FIG. 5 is a partial cross-sectional view taken generally along the line 2-2 of FIG. 1 similar to FIG. 2 depicting a closure mechanism according to a further embodiment;
FIG. 6 is a partial cross-sectional view of the closure mechanism of FIG. 5 depicting operation of the closure mechanism and bag when pressure is exerted from within the bag;
FIG. 7 is a partial cross-sectional view taken generally along the line 2-2 of FIG. 1 similar to FIG. 2 depicting a closure mechanism according to yet another embodiment;
FIG. 8 is a partial cross-sectional view similar to FIG. 7 depicting the effect of an opening force on the closure mechanism of FIG. 7;
FIGS. 9 and 10 are diagrammatic partial cross-sectional views similar to FIG. 2 of closure mechanisms according to even further embodiments of the present invention; and
FIGS. 11-13 are partial cross-sectional views taken generally along the lines 2-2 of FIG. 1 similar to FIG. 2 depicting closure mechanisms according to further embodiments.
DETAILED DESCRIPTION
Referring to FIGS. 1-3, a reclosable pouch in the form of a thermoplastic storage bag 20 has opposing bag walls 22, 24 joined at side portions 26, 28 and at a gusset 30 disposed along a bottom portion of the storage bag to form a body portion 32. An opening 34 into an interior of the bag 20 is disposed along a top edge 36 of each of the bag walls 22, 24. A top end of each of the bag walls 22, 24 is folded down inwardly at the respective top edges 36 to form two opposing lips 38a, 38b, respectively. The lips 38a, 38b have opposing internal webs 40a, 40b, respectively, extending downwardly from the top edges 36. Each of the internal webs 40a, 40b is laminated to the respective bag wall 22, 24 at only a single area, such as a lamination strip 42, between respective interior or bottom ends 40c, 40d of the internal webs and the top edges 36. Flanges 44a and 44b are also laminated to the internal webs 40a, 40b, respectively, at or substantially coextensive with the lamination strip 42. Resealably interlockable closure mechanisms 46, 48 are disposed between the flanges 44a and 44b with the closure mechanism 46 disposed between the closure mechanism 48 and the top edge 36. The closure mechanism 46 includes male and female closure elements or portions 50a, 50b, which are disposed on opposing internal surfaces of the flanges 44a, 44b. The male closure element 50a is laminated to an inside surface of the flange 44b substantially coextensive with the lamination strip 42, and the female closure element 50b is laminated to an inside surface of the flange 44a substantially coextensive with the lamination strip 42. The closure mechanism 48 includes male and female closure elements or portions 52a and 52b, respectively, which are disposed on opposing internal surfaces of the flanges 44a, 44b near respective bottom ends 44c, 44d thereof. The bottom ends 44c, 44d of the flanges 44a, 44b behind the closure mechanism 48 in this embodiment are not attached to the bottom ends 40c, 40d of the internal webs 40a, 40b or to the bag walls 22, 24. Similarly, the internal webs 40a, 40b are not attached to the bag walls 22, 24, respectively, between the respective top edges 36 and the lamination strip 42. In one embodiment, the closure mechanism 46 is parallel to the closure mechanism 48 and spaced therefrom a distance that is sufficiently small to create the perception to a user that both mechanisms act as a single closure. These results may be achieved by spacing the closure mechanisms 46 and 48 a distance of, for example, between about 0.2 inch (5.08 mm) and about 0.3 inch (7.62 mm) apart, or between about 0.22 inch (5.59 mm) and about 0.28 inches (7.11 mm) apart, or about 0.25 inch (6.35 mm) apart. A handle 54 is disposed in the lips 38a, 38b and opposing internal webs 40a, 40b above the closure mechanisms 46, 48. In one embodiment, the handle 54 is formed by an oblong hole through the internal webs 40a, 40b and the lips 38a, 38b. In another embodiment, the handle 54 includes one or more rigid members secured to the lips 38a, 38b and/or other known handle devices.
The closure elements 50a, 50b, 52a, and 52b in some embodiments have a cross sectional shape and/or are formed in accordance with the teachings of Geiger et al., U.S. Pat. No. 4,755,248. The closure elements 50a, 50b, 52a, and 52b in other embodiments have a cross sectional shape and/or are formed in accordance with the teachings of Zieke et al., U.S. Pat. No. 4,741,789. In yet other embodiments, the closure elements 50a, 50b, 52a, and 52b have a cross sectional shape and/or are formed in accordance with the teachings of Porchia et al., U.S. Pat. No. 5,012,561. Each of these patents is owned by the assignee of the present application and is hereby incorporated by reference herein in the entirety thereof. In one embodiment, the first closure mechanism 46 exhibits a first closure characteristic and the second closure mechanism 48 exhibits a second closure characteristic different than the first closure characteristic. For example, either or both of the first and second closure mechanisms 46, 48 may exhibit a relatively low level of resistance to bag opening forces but provide a high level of deformation so as to exhibit a clicking feel and/or sound when the bag is opened or closed. In addition, either or both of the first and second closure mechanisms 46, 48 may exhibit a low level of deformation but provide a relatively high overall resistance to bag opening forces. Further, either or both of the male closure elements 50a, 52a may be symmetric or asymmetric about a longitudinal centerline thereof, and either or both of the female closure elements 50b, 52b may be symmetric or asymmetric about a longitudinal centerline thereof.
In the embodiment shown in FIGS. 2 and 3, each of the male and female elements 50a, 50b is symmetric about a longitudinal centerline thereof. The male closure element 50a includes a base member 56 disposed on an internal surface of the flange 44b with an arrow-shaped engagement member 58 extending therefrom. The female closure element 50b has a C-shaped profile, which includes a base member 60 disposed on an internal surface of the flange 44a with spaced-apart inwardly hooked legs 62, 64 extending therefrom. The female closure element 50b is adapted to interlockingly receive the male element 50a when urged together by a closing pressure, such as by a user's finger during closing of the pouch. Similarly, the female closure element 52b has a C-shaped profile, which includes a base member 66 disposed on an internal surface of the flange 44b with spaced-apart inwardly hooked legs 68, 70 extending therefrom. The male closure element 52a includes a base portion 72 disposed on an internal surface of the flange 44a with an upwardly turned asymmetrical hooked engagement member 74 extending therefrom. (As used throughout, relative positional descriptors, such as up, down, left, right, etc., are with respect to the figures, it being understood that different orientation would change such relative positions.)
In one embodiment, the engagement member 58 of the male closure element 50a may have ridges on opposite sides thereof equally spaced from a distal end as shown. In other embodiments, the male closure element 50a may have points or hooks protruding from sides thereof. Other types of profiles of the engagement member 50a should be apparent to those skilled in the art.
As illustrated in FIG. 3, in one embodiment, a high external opening force Fe of about 4-6 lbs/inch (0.79-1.18 kg/cm) is required to open the bag 20. The external opening force Fe reduces the propensity of the bag 20 to open due to stress exerted on the closure mechanisms 46, 48 by weight of contents (not shown) placed inside the bag when the bag is held by a user from the handle 54 shown in FIG. 1. In another embodiment, a relatively large bag with an internal holding capacity of approximately 72 lbs. (33 kg) has an opening of approximately 24 inches (61 cm) long that is secured or closed by the closure mechanisms 46, 48. In this embodiment, the closure mechanisms 46, 48 have an external opening force of approximately 3 lbs/inch (0.54 kg/cm). The male closure element 50a disengages from the female closure element 50b with a first external opening force Fe1, and the male closure element 52a disengages from the female closure element 52b with a second external opening force Fe2. The first and second external opening forces Fe1 and Fe2 are exerted from a side of the bag 20 nearer the top edge 36, such as from the handle 54, as opposed to internal bursting forces, which act on the closure mechanisms 46, 48 from the contents stored within the bag 20. Internal bursting forces, however, have a similar opening effect as the external opening force described above because the bag walls 22, 24 are only secured to the closure mechanism 46 at the lamination strip 42 and not to the unattached bottom ends 44c, 44d where the closure mechanism 48 is attached. The first external opening force Fe1 is larger than the second external opening force Fe2 because of the asymmetrical hooked engagement member 74 on the male closure element 52a. Once the first external opening force Fe1 causes the closure mechanism 46 to open, the first external opening force Fe1 is translated by momentum into the second external opening force Fe2 that opens the closure mechanism 48. The asymmetrical hooked engagement member 74 of the male element 52a may help to reduce the closing force required for closure mechanism 48 because the female closure element 52b does not have to stretch around an extra hook portion on the opposite side of the engagement member 74 of the male closure element 52a. This reduced stretching may allow the closure mechanism 48 to be closed with less force than is required to close the closure mechanism 46. In the event that the closure mechanism 48 pops open inadvertently while the pouch is in use due to internal bursting forces, the closure mechanism 46 remains closed until the opening force thereof is met. In such an instance, the closure mechanism 46 is less likely to open inadvertently if the bag 20 is being held by the handle 54, such as by a user's hand, because of opposing forces exerted on the closure mechanism keeping portions of the top edges 36 together.
In one embodiment, a venting mechanism is incorporated into the bag 20 in the form of one or more holes through one or both of the flanges disposed between the upper closure mechanism and the lower closure mechanism. In bag 20, for example, a plurality of holes 76 extends through each of the flanges 44a, 44b. The holes 76 are disposed between the closure mechanism 46 and the closure mechanism 48. In one method of venting excess air from the bag 20, the closure mechanism 48 is closed first. Then, excess air is expelled from the bag 20 through the holes 76. After expelling the excess air, the closure mechanism 46 is closed to complete a seal along the top edge 36. In the case where holes 76 are utilized for venting, the closure mechanisms 46 and 48 may be spaced a distance of, for example, between about 0.3 inch (7.62 mm) and about 0.4 inch (10.16 mm) apart, or between about 0.32 inch (8.13 mm) and about 0.38 inches (9.65 mm) apart, or about 0.35 inch (8.89 mm) apart.
In another embodiment depicted in FIG. 4, a bag 80 (which is generally similar to the bag 20) has an upper closure mechanism 82 and a lower closure mechanism 84. The lower closure mechanism 84 is disposed on a product side of the bag 80. The upper closure mechanism 82 is disposed on an opening side of the bag 80 between the top edge 36 and the lower closure mechanism 84. The upper closure mechanism 82 includes a male closure element 82a disposed on the inner surface of the flange 44b interlockingly opposing a female closure element 82b disposed on the inner surface of the flange 44a. External surfaces of the flanges 44a, 44b are attached, such as by lamination or adhesive, to the internal webs 40a, 40b, respectively, at the single area or lamination strip 42, opposite the upper closure mechanism 82. The upper male closure element 82a includes a base member 86 disposed on the flange 44b and an asymmetric hooked engagement member 88 extending therefrom. The asymmetric hooked engagement member 88 has a downwardly turned hook 90a and an upper protrusion, such as a ridge or upwardly turned hook 90b. In one embodiment, the upwardly turned hook 90b is smaller and disposed lower on the stem than the downwardly turned hook 90a, which lowers the force needed to occlude the male and female closure elements 82a, 82b because the female closure element does not pass over the upwardly turned hook 90b and the downwardly turned hook 90a at the same time. In another embodiment, the upwardly turned hook 90b may be the same size or larger than the downwardly turned hook 90a depending on the opening and closing properties desired. The female closure element 82b has a C-shaped profile and includes a base member 92 disposed on flange 44a, with spaced-apart inwardly hooked legs 94, 96 extending therefrom. The female closure element 82b is adapted to interlockably receive the male closure element 82a when a closing pressure urges the closure elements together, such as by a user's finger during closing of the bag 80. In this embodiment, the lower closure mechanism 84 is substantially similar to the upper closure mechanism 46 shown in FIGS. 2 and 3. The lower closure mechanism 84 includes a male closure element 50a disposed on the inner surface of the flange 44a interlockingly opposing a female closure element 50b disposed on the inner surface of the flange 44b. The lower closure mechanism 84 is disposed between the upper closure mechanism 82 and the bottom ends 44c, 44d of the flanges 44a, 44b, respectively.
The asymmetric hooked engagement member 88 reduces the closing force required to close the upper closure mechanism 82 while requiring a larger opening force. The larger downwardly turned hook 90a of the engagement member 88 has a higher external opening force than the opposing smaller upwardly turned hook 90b. In one embodiment, the upper closure mechanism 82 provides a smooth sensation and the lower closure mechanism 84 provides a clicking sensation during a closing operation. Illustratively, an external opening force Fe3 of about 4-6 lbs./inch (0.79-1.18 kg/cm) is required to open upper closure mechanism 82, and the lower closure mechanism 84 has a lower external opening force Fe4 of about 3-5 lbs./inch (0.59-0.98 kg/cm) because of the symmetrical arrow-shaped engagement member 46a. Vent holes (not shown) similar to the holes 76 may be included as part of a similar venting mechanism as heretofore described with respect to FIGS. 2 and 3. In another embodiment (not shown), areas of the respective flanges 44a, 44b and internal webs 40a, 40b generally coextensive with one of the closure elements 50a or 50b may also a laminated with the respective bag wall 22 or 24 leaving only one of the closure elements 50a, 50b, 82a, or 82b unsecured directly to one of the bag walls through the flanges and internal webs.
Referring to FIG. 5, another embodiment of a reclosable bag 98 similar to the bags 20 and 80 is depicted. The reclosable bag 98 includes an upper closure mechanism 99 and a lower closure mechanism 100. The lower closure mechanism 100 is disposed on a product side of the bag 98 and the upper closure mechanism 99 is disposed on an opening side of the bag 98 between the top edge and the lower closure mechanism 100. The upper closure mechanism 99 includes a male closure element 102a disposed on the inner surface of the flange 44b interlockingly opposing a female closure element 102b disposed on the inner surface of the flange 44a. External surface of the flanges 44a, 44b are attached, such as by lamination or adhesive to the internal webs 40a, 40b, respectively, at the single are or lamination strip 42, opposite the upper closure mechanism 99. The upper male closure element 102a includes a base member 103 disposed on the flange 44b and a symmetrical hooked engagement member 104 extending therefrom. The female closure element 102b has a C-shaped profile 105 and includes a base member 106 disposed on the flange 44a, with spaced-apart inwardly hooked legs 107a, 107b extending therefrom. The female closure element 102b is adapted to interlockably receive the male closure element 102a when a closing pressure urges the closure elements 102a, 102b together, such as by a user's finger during closing of the bag 98. In this embodiment, the lower closure mechanism 100 is substantially similar to the upper closure mechanism 99. The lower closure mechanism 100 includes a male closure element 108a disposed on the inner surface of the flange 44a interlockingly opposing a female closure element 108b disposed on the inner surface of the flange 44b. The lower closure mechanism 100 is disposed between the upper closure mechanism 99 and the bottom ends 44c, 44d of the flanges 44a, 44b.
As with other embodiments, the top ends of the bag walls 22, 24 of FIG. 5 are folded down inwardly at respective top edges 36 to form two opposing lips 38a, 38b, respectively. The internal webs 40a, 40b of the lips 38a, 38b extend downwardly behind the flanges 44a, 44b such that when the flanges 44a, 44b are laminated to the bag walls 22, 24, respectively, the internal webs 40a, 40b are also laminated to the bag walls 22, 24 as a lamination strip 42. In the embodiment of FIG. 5, the lamination strip 42 is disposed only behind the male and female closure elements 102a, 102b of the upper closure mechanism 99.
In one embodiment, the upper closure mechanism 99 of FIG. 5 provides a smooth sensation and the lower closure mechanism 100 provides a clicking sensation during a closing operation. Vent holes (not shown) similar to the holes 76 may optionally be included as part of a similar venting mechanism as heretofore described with respect to FIGS. 2 and 3.
FIG. 6 depicts a method of operation of the bag 98 of FIG. 5 when pressure is exerted from inside the bag 98, it being understood that the method of operation of the bags 20 and 80 of FIGS. 2-4 is similar. As pressure is exerted from within the bag 98, the bag walls 22, 24 move outwardly as indicated by arrows 110a, 110b. Since the flanges 44a, 44b are only attached to the bag walls 22, 24 at the lamination points 42 behind the closure elements 102a, 102b, no direct pressure is exerted on the closure elements 108a, 108b of the lower closure mechanism 100. Such a design prevents the lower closure mechanism 100 from inadvertently opening due to pressure from within the bag 98. In the embodiment of FIGS. 5 and 6, an external opening force Fe5 of about 4-6 lbs./inch (0.79-1.18 kg/cm) is required to open the upper closure mechanism 99 and the lower closure mechanism 100 has a lower external opening force Fe6 of about 3-6 lbs./inch (0.59-1.18 kg/cm).
In yet another embodiment shown in FIGS. 7 and 8, a reclosable bag 120 (which is similar to the bags 20 and 80) includes opposing bag walls 122, 124. Top ends of the bag walls 122, 124 are folded downwardly and inwardly at a top edge 126 to form two opposing lips 126a, 126b. The lips 126a, 126b include opposing internal webs 128a, 128b, respectively, that extend downwardly from the top edge 126. The internal webs 128a, 128b are attached to the bag walls 122, 124, respectively, at a single area, such as by lamination at a lamination strip 130, between bottom edges 128c and 128d of the internal webs 128a, 128b and the top edges 126. Flanges 132a, 132b are attached to internal webs 128a, 128b at or coextensive with the lamination strip 130. Resealable closure mechanisms 134, 136 are disposed between the flanges 132a, 132b on opposite sides of the lamination strip 130. The flanges 132a, 132b are not attached to the internal webs 128a, 128b, respectively, behind the closure mechanisms 134, 136, thereby leaving upper and lower ends of the flanges unattached to the internal webs. Similarly, the lower ends 132c, 132d of the flanges 132a, 132b are not attached to the bag walls 122, 124. The closure mechanism 134 includes a male closure element 134a disposed on an internal surface of flange 132b interlockingly opposing a female closure element 134b disposed on an internal surface of the flange 132a. The male closure element 134a includes a base member 138 disposed on the flange 132b and an asymmetric downwardly hooked engagement member 140 extending therefrom. The female closure element 134b has a C-shaped profile and includes a base member 142 disposed on the flange 132a with spaced-apart inwardly hooked legs 144, 146 extending therefrom. The female closure element 134b is adapted to interlockably receive the male closure element 134a when a closing pressure urges the closure elements together. The closure mechanism 136 includes a male closure element 136a disposed on the internal surface of the flange 132a interlockingly opposing a female closure element 136b disposed on the internal surface of flange 132b. Each of the male closure element 136a and the female closure element 136b is symmetric about a centerline thereof. The male closure element 136a includes a base member 148 disposed on an internal surface of the flange 132a with a symmetrical arrow-shaped engagement member 150 extending therefrom. The female closure element 136b has a C-shaped profile, which includes a base member 152 disposed on an internal surface of the flange 132b with spaced-apart inwardly hooked legs 154, 156 extending therefrom.
The closure mechanism 134 is parallel to the closure mechanism 136 and spaced therefrom a distance that is sufficiently small to create the perception to a user that both mechanisms act as a single closure. In some embodiments, the closure mechanisms 134, 136 are spaced sufficiently far apart such that a user's fingers and/or thumb are guided therebetween during a closing operation. These results may be achieved, for example, by spacing the closure mechanisms 134, 136 between about 0.1 inch (2.54 mm) and about 0.3 inch (7.62 mm) apart, or between about 0.15 inch (3.81 mm) and about 0.25 inch (6.35 mm) apart, or about 0.20 inch (5.08 mm) apart. Different distances between the closure elements 134, 136 may be used depending on the desired application thereof.
As illustrated in FIG. 8, a first external opening force Fe7 applied to the bag 120 at top portions 126a, 126b causes the closure mechanism 134 to open. A second external opening force Fe8 is required to open the closure mechanism 136. In the present embodiment, however, the closure mechanism 136 can be designed to require about the same external opening force as the closure mechanism 134. Therefore, the first external opening force Fe7 required to open the closure mechanism 134 can be easily translated to open the closure mechanism 136. Additionally, the symmetric arrow-shaped engagement member 150 of the closure mechanism 136 provides a clicking effect during closing, which is caused by the closing force required to stretch the inwardly hooked legs 154, 156 over the symmetric arrow-shaped engagement member 150 during a closing operation. In another embodiment (not shown), coextensive or non-coextensive holes through the bag walls 122, 124, interior webs 128a, 138b, and the flanges 132a, 132b can be disposed between the closure mechanisms 134, 136 to provide one or more vent paths (not shown) for exhausting air out of the bag 120. For example, the air may be exhausted by first closing the closure mechanism 134, then squeezing the air out of the bag 120 through the vent paths, and then closing the closure mechanism 136.
In FIGS. 9 and 10, another bag 200, including opposing sidewalls 202a, 202b defining a mouth 204 into an interior 206, has a double closure mechanism tape and a venting system. In the embodiment shown in FIG. 9, the double closure mechanism tape includes an outer closure mechanism 208 spaced from an inner closure mechanism 210, both of which are carried between opposing backing tapes 212a, 212b. Each closure mechanism 208, 210 includes opposing closure members 208a, 208b and 210a, 210b, respectively, which may take the specific form of any known closure mechanism, such as any of the closure mechanisms disclosed previously herein or other known zipper profiles and closure mechanisms. Each backing tape 212a, 212b is attached, such as by lamination, to the respective bag wall 202a, 202b only at one location 214a, 214b, respectively, which is coextensive with or opposite the inner closure mechanism 210, leaving outer ends 216 of the backing tape carrying the outer closure mechanism 208 unattached to the bag walls. In this embodiment, top ends 218 of the bag sidewalls 202a, 202b are not folded over. Rather, the top ends 218 of the sidewalls 202a and 202b are single ply walls that extend beyond the outer ends 216 of the backing tapes 212a, 212b, and a handle is formed with the top ends of the bag sidewalls 202a, 202b, such as with a finger hole 220 or a rigid handle attachment 222. The bag 200 includes a venting mechanism, such as holes 224 through each backing tape 212a, 212b between the outer closure mechanisms 208 and the inner closure mechanism 210. To expel excess air from the bag, the outer closure mechanism 208 is first closed, excess air is then expelled through the holes 224, and then the inner closure mechanism 210 is closed to form a seal.
In the embodiment shown in FIG. 10, each backing tape 212a, 212b includes a lip 226a and 226b, respectively, which extends beyond the top ends 218 of the bag sidewalls 202a, 202b. Traction members, such as bumps, recesses, and/or elongate grip ridges 228, are disposed on an inside surface of the lips 226a, 226b to facilitate gripping traction when opening the double closure mechanism tape. As shown in FIG. 10, the sidewalls 202a, 202b, may be attached to an outside surface of the respective backing tapes 212a, 212b opposite either the inner closure members 210a, 210b or the outer closure members 208a, 208b. In another embodiment, the sidewalls 202a, 202b are attached to the outside surface of the respective backing tapes 212a, 212b between the inner closure mechanism 210 and the outer closure mechanism 208 similar to the embodiment shown in FIGS. 7 and 8. In a further embodiment, the traction members are omitted so that the inside surfaces of the lips 226a, 226b are smooth, and handles, such as the finger hole 220 or the rigid handle attachment 222, are disposed on one or both of the lips 226a, 226b in a similar manner as shown in FIG. 9 on the sidewalls 202a, 202b.
In another embodiment depicted in FIG. 11, a bag 250 (which is generally similar to the bag 20) has an upper closure mechanism 252 and a lower closure mechanism 254. The lower closure mechanism 254 is disposed on a product slide of the bag 250 and the upper closure mechanism 252 is disposed on an opening side of the bag 250 between the top edge 36 and the lower closure mechanism 254. The upper closure mechanism 252 includes a female closure element 252a disposed on an inner surface of a first flange 256a interlockingly opposing a male closure element 252b disposed on an inner surface of a second flange 256b. The upper female closure element 252a includes a base member 258 and a symmetrical C-shaped profile 260 extending from the inner surface of the first flange 256 toward the male closure element 252b. The upper male closure element 252b is adapted to engage the upper female closure element 252a, wherein the male closure element 252b includes a base member 262 disposed on the flange 256b and a symmetrical arrow-shaped profile 264 extending from the inner surface of the flange 256b toward the female closure element 252a.
The lower closure mechanism 254 includes a male closure element 254a disposed on the inner surface of the first flange 256a interlockingly opposing a female closure element 254b disposed on the inner surface of the second flange 256b. The lower male closure element 254a includes a base member 270 disposed on the flange 256a and an asymmetric hooked engagement member 272 extending therefrom. The asymmetric hooked engagement member has a downwardly turned hook 274 that requires a higher opening force from within the bag 250 to disengage the closure elements 254a, 254b and requires a lower external opening force to disengage the closure elements 254a, 254b. In fact, when the upper closure elements 252a, 252b are disengaged, the lower closure elements 254a, 254b fall open due to the absence of a hook opposite the hooked engagement member 272. The female closure element 254b includes a base member 276 and a C-shaped profile 278 extending therefrom, wherein the female closure element 254b is adapted to engage the hooked engagement member 272.
Still referring to the embodiment of FIG. 11, external surfaces of the flanges 256a, 256b are attached, such as by lamination or adhesive, to bag walls 280a, 280b at first attachment areas 282a, 282b. The first attachment areas 282a, 282b are disposed opposite the closure elements 254a, 254b. In addition, external surfaces of the flanges 256a, 256b are attached in a similar manner to first and second handle portions 284a, 284b at second attachment areas 286a, 286b. The second attachment areas 286a, 286b are disposed opposite the closure elements 252a, 252b, respectively. The handle portions 286a, 286b may have a thickness that is greater than a thickness of the bag walls 280a, 280b. For example, the handle portions 284a, 284b may have a thickness of 6 mils (0.15 mm) and the bag walls 280a, 280b may have a thickness of 2.5 mils (0.064 mm). In addition, the handle portions 284a, 284b may be comprised of a different material or materials than the bag walls 280a, 280b.
FIG. 12 depicts an embodiment of the bag 250 of FIG. 11, wherein the closure mechanisms 252, 254 are identical, but the method of attachment of the flanges 256a, 256b to the bag walls 280a, 280b and the handle portions 284a, 284b is different. In particular, external surfaces of the flanges 256a, 256b are attached in a manner similar to that of FIG. 11, to both the bag walls 280a, 280b and handle portions 284a, 284b at attachment areas 290a, 290b, respectively. The attachment areas 290a, 290b are disposed opposite the closure elements 252a, 252b to increase the opening force needed to open the lower closure mechanism 254 from the product side of the bag 250, as discussed in detail above. Although the bag walls 280a, 280b are depicted as being disposed adjacent the flanges 256a, 256b, the handle portions 284a, 284b may alternatively be disposed adjacent the flanges 256a, 256b. The bag walls 280a, 280b and handle portions 284a, 284b may have thicknesses similar to those of FIG. 11. As with the embodiment of FIG. 11, the bag walls 280a, 280b and the handle portions 284a, 284b may be made of different materials.
Another embodiment of the bag 250 of FIG. 11 with identical closure mechanisms 252, 254, but a different method of attachment is depicted in FIG. 13. First and second bag walls 292a, 292b are attached in a manner similar to that described above to the flanges 256a, 256b at attachment areas 294a, 294b, respectively. The attachment areas 294a, 294b are disposed opposite the closure elements 252a, 252b to increase the opening force needed to open the lower closure mechanism 254 from the product side of the bag 250, as discussed in detail above. The bag walls 292a, 292b extend below the flanges 256a, 256b to form the bag 250 and extend above the flanges 256a, 256b to form handles 296a, 296b.
Although two closure mechanisms are depicted in each of the embodiments herein, any number of closure mechanisms may be used.
It will be apparent to those skilled in the art that numerous combinations of symmetric and asymmetric male and female closure elements are possible to create pouches of various sizes and shapes with a multitude of differing opening and closing forces. The number of closure mechanisms and the order and placement on the pouch walls may be varied to adjust the opening and closing characteristics of the pouch. Additionally, it is envisioned that various other closure characteristics, such as tactile feedback, aural feedback, etc., can be used in conjunction with the aforementioned embodiments.
INDUSTRIAL APPLICABILITY
The pouch described herein provides a plurality of different closure characteristics and can provide greater security against inadvertent opening of the pouch. The distance between the closure mechanisms can be varied as desired and the male and female closure elements may be disposed on either bag wall. A bag including a dual closure mechanism with at least one of the closure mechanisms disposed along a portion of a backing flange that is not attached to the bag walls may reduce inadvertent opening of the closure mechanisms due to internal bursting forces in a larger bag. Further, a pouch having a double zipper tape with at least one zipper not being laminated or directly secured to the pouch walls allows the zipper tape to be attached to film for forming the pouch walls using conventional hot bar, single-zipper sealing technology with only minimal change to existing production sealing equipment to accommodate the added width of the double zipper tape.
Numerous modifications to the present disclosure will be apparent to those skilled in the art in view of the foregoing description. Accordingly, this description is to be construed as illustrative only and is presented for the purpose of enabling those skilled in the art to make and use the disclosure and to teach the best mode of carrying out same. The exclusive rights to all modifications that come within the scope of the disclosure are reserved.
Patent Grant
9011003
