CA1213251A - Adhesive channel closure for flexible bags - Google Patents
Adhesive channel closure for flexible bagsInfo
- Publication number
- CA1213251A CA1213251A CA000416469A CA416469A CA1213251A CA 1213251 A CA1213251 A CA 1213251A CA 000416469 A CA000416469 A CA 000416469A CA 416469 A CA416469 A CA 416469A CA 1213251 A CA1213251 A CA 1213251A
- Authority
- CA
- Canada
- Prior art keywords
- channel
- bag
- channel strip
- trough
- adhesive layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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Abstract
ABSTRACT
ADHESIVE CHANNEL CLOSURE FOR FLEXIBLE BAGS
A closure suitable for use with a flexible bag, such as a sandwich bag where the closure comprises at least one female strip affixed to a first surface, the channel having a layer of pressure sensitive adhesive less than the depth or the interior height of the channel and located on an internal portion of the channel, and a second surface, whereby the seal is formed by contacting the pressure sensitive adhesive layer in the channel with a portion of the second surface.
ADHESIVE CHANNEL CLOSURE FOR FLEXIBLE BAGS
A closure suitable for use with a flexible bag, such as a sandwich bag where the closure comprises at least one female strip affixed to a first surface, the channel having a layer of pressure sensitive adhesive less than the depth or the interior height of the channel and located on an internal portion of the channel, and a second surface, whereby the seal is formed by contacting the pressure sensitive adhesive layer in the channel with a portion of the second surface.
Description
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COHESIVE CHANNEL CLOSURE FOR Flexible BAGS
.
To present: invention relaxes is closures sulk able or use with ~lexlble bags, such as sandwich bags mad out ox polyethylene em.
A number of closure arrangements have beer us to seal and/or close plastic bags such as those used or sandwiches, adage containers, and other household uses. These previous attempts include the swilled profile bags where the closure comprises one or more sets ox mating channels. Each channel may be wormed as an integral part ox 'eke bag or ~a~rlcated as a separate puce and Atwood to the bag ye example ox a profile closure is the "ZIP-LOC"* storage bag is wound in US, Reissue Patent 28,969 to l~b~to. or exiles ox , .
profile bags may be found in US. Patent 3,226,787 and US. Patent 3,060,985. As seen in USE Patent 4,186,786 to Kirkpatrick, colored channels have been used to allow the user to more easily detect complete occlusion ox profile bag openings. In order to achieve satisfactory use with profile bag closures, over, the matlnn members must Kit properly an be aligned correctly. It may take several attempts at closing the bag before proper registration ox the mating members is finally achieved. Bags with profile closures also tend to be an expensive choice or uses which do not require the containment of liquids. ..
Other types ox bag closures us one en more adhesive strips.
Problems with such adhesive closures include weak shear strength because the exposed adhesive or a strip must be selected to be weak enough so that it does not und~sl~ably stick to other bags while on a roll or in a box.
An attempt to combine a profile closure with an adhesive may be seen on US. Patent 3,339,606 to Khgl~r. the releasable closure in the Bugler patent comprises a tongue on one mimer and a Roy on the * Trademark ....
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:,, other member where the tongue is of a thickness less than the with of the groove and wherein a releasable pressure sensitive adhesive is provided to keep the tongue within the groove. This structure, however still requires registration ox mating channels.
-I Attempts have also been made to protect the adhesive stripuntil thy bag is used. In US. Patent 3,420,4~3 to Bostwick a closure flap having an adhesive applied thereto is folded or-overlapped upon itself to form a protective enclosure for the adhesive prior to the use of the bag. In US. Patent 3,990,627 to Olson Rand assigned to the same assignee as this application), a Fold adhesive closure or bags is disclosed wherein the adhesive strip is covered my the upper portion ox the bag's front wall until ready or use It is difficult, however, Jo find an adhesive which is easy to apply, which is strong ; enough to form an e Mective seal upon closure but which does not cause undesirable problems by sticking to other bags or miscellaneous surfaces.
In the pressure sensitive adhesive art, the solution to the ' problem of sticking during shipment an storage has been to provide aj release layer o'er the pressure sensitive adhesive. For example, pressure sensitive plastic tapes have a release layer which impedes the sticking of tune adhesive to the plastic of the adjacent layer in the roll. This approach is not desirable on closures for plastic bags because of expense and difficulty in manufacture.
j Thus, it it an object of the present invention to provide closures suitable for use with plastic bags wherein the closures are able to effect a satisfactory seal as needed, without sticking to I other bags while in stowage. It is a further object of this invention i to provide a closure suitable for use with flexible bags where a more powerful adhesive may be utilized without interfering with the storage 7 of the bag on a roll. It is yet another object ox this invention to provide closure seals or use with flexible bags wherein mating .
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contact between slap and front is not needed to eject closure. It is a further object ox this invention to provide a flexible bag with an i openable and resealable closure. It is another object still to provide a closure for a flexible bag in Which the bag may be pitted to the object contained therein and the closure may be used to maintain the I It is another object no this invention to provide a flexible bag with a resealable closure which exhibits good shear strength.
These and other objects ox the invention will be apparent from the following description.
The present invention provides a closure suitable for use with flexible bags, such as thermoplastic bags, especially those made prom polyethylene, wherein the closure comprises at least one female channel member or strip affixed to the bag and having a pressure sensitive adhesive layer on an internal potion ox the channel strip such that the thickness of the adhesive layer is less than the interior depth of the wall ox the channel strip. During shipment and storage the walls ox the channel hold the pressure sensitive adhesive layer away from adjacent surfaces to prevent inadvertent sticking.
Sealing of the bag is achieved by contacting the channel strip with a ', surface ox the bag and exerting pressure along the strip whereby the pressure sensitive adhesive is contacted with a substantially slat portion ox the surface and adhered thereto.
In one embodiment of the invention the channel with the ` adhesive layer is positioned on the flap of the byway yin a second embodiment the channel with the adhesive is positioned on the owe ox the bag over which the slap will fold.
A third embodiment comprises two female channel strips j positioned on opposite sides ox a bag opening A double seal is ejected by pressing the two channels into contact such as one wall or bead ox each channel is contacted by the adhesive layer in the opposing channel.
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F-1394 -pa-the present invention in one aspect resides in a closure suitable for use with a flexible bag, the closure comprising at least one female channel strip having a trough between two spreadable channel ribs said female channel strip being affixed to a first surface with the trough of the channel facing away iron the first surface, the channel strip having a pressure sensitive adhesive layer on an internal portion of the channel strip in the trough, the thickness of the adhesive layer being less than the interior height of the channel strip, an a second surface hazing a substantially flat portion which can be pressed into the trough by spreading said channel ribs, whereby a seal is formed by contacting the pressure sensitive adhesive layer with the substantially flat portion of the second surface The present invention additionally provides a resealable flexible bag comprising:
a) a bag body;
b) a closure, wherein the closure comprises:
1) at least one female channel strip having a trough between two spreadable channel ribs, said female channel strip being affixed to a first surface with the trough of the channel strip having a pressure sensitive adhesive layer on an internal portion of the channel strip in the trough, the thickness of the adhesive layer being less than the interior height of the channel strip; and c) a second surface on the jag having a substantially flat portion engaging the trough of the channel strip by spreading said channel ribs.
; m e present invention further provides a thermoplastic bag comprising:
a) a front wall and a back wall, the walls being joined along the major portion of their opposite longitudinal edges and bottom;
b) an open mouth adjacent to the top edge of the front wall, the open mouth of the bag having a flap which is an extension of the front bag wall and having longitudinal edges B
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, which are not joined to the upper- edges of the back wall; and c) a closure comprising:
' 1) a female channel strip affixed to a surface of I one of the wills at a preselected distance from the opening, the channel strip having a trough between two spreadable channel walls;
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COHESIVE CHANNEL CLOSURE FOR Flexible BAGS
.
To present: invention relaxes is closures sulk able or use with ~lexlble bags, such as sandwich bags mad out ox polyethylene em.
A number of closure arrangements have beer us to seal and/or close plastic bags such as those used or sandwiches, adage containers, and other household uses. These previous attempts include the swilled profile bags where the closure comprises one or more sets ox mating channels. Each channel may be wormed as an integral part ox 'eke bag or ~a~rlcated as a separate puce and Atwood to the bag ye example ox a profile closure is the "ZIP-LOC"* storage bag is wound in US, Reissue Patent 28,969 to l~b~to. or exiles ox , .
profile bags may be found in US. Patent 3,226,787 and US. Patent 3,060,985. As seen in USE Patent 4,186,786 to Kirkpatrick, colored channels have been used to allow the user to more easily detect complete occlusion ox profile bag openings. In order to achieve satisfactory use with profile bag closures, over, the matlnn members must Kit properly an be aligned correctly. It may take several attempts at closing the bag before proper registration ox the mating members is finally achieved. Bags with profile closures also tend to be an expensive choice or uses which do not require the containment of liquids. ..
Other types ox bag closures us one en more adhesive strips.
Problems with such adhesive closures include weak shear strength because the exposed adhesive or a strip must be selected to be weak enough so that it does not und~sl~ably stick to other bags while on a roll or in a box.
An attempt to combine a profile closure with an adhesive may be seen on US. Patent 3,339,606 to Khgl~r. the releasable closure in the Bugler patent comprises a tongue on one mimer and a Roy on the * Trademark ....
F-1394 I ~21325;~
:,, other member where the tongue is of a thickness less than the with of the groove and wherein a releasable pressure sensitive adhesive is provided to keep the tongue within the groove. This structure, however still requires registration ox mating channels.
-I Attempts have also been made to protect the adhesive stripuntil thy bag is used. In US. Patent 3,420,4~3 to Bostwick a closure flap having an adhesive applied thereto is folded or-overlapped upon itself to form a protective enclosure for the adhesive prior to the use of the bag. In US. Patent 3,990,627 to Olson Rand assigned to the same assignee as this application), a Fold adhesive closure or bags is disclosed wherein the adhesive strip is covered my the upper portion ox the bag's front wall until ready or use It is difficult, however, Jo find an adhesive which is easy to apply, which is strong ; enough to form an e Mective seal upon closure but which does not cause undesirable problems by sticking to other bags or miscellaneous surfaces.
In the pressure sensitive adhesive art, the solution to the ' problem of sticking during shipment an storage has been to provide aj release layer o'er the pressure sensitive adhesive. For example, pressure sensitive plastic tapes have a release layer which impedes the sticking of tune adhesive to the plastic of the adjacent layer in the roll. This approach is not desirable on closures for plastic bags because of expense and difficulty in manufacture.
j Thus, it it an object of the present invention to provide closures suitable for use with plastic bags wherein the closures are able to effect a satisfactory seal as needed, without sticking to I other bags while in stowage. It is a further object of this invention i to provide a closure suitable for use with flexible bags where a more powerful adhesive may be utilized without interfering with the storage 7 of the bag on a roll. It is yet another object ox this invention to provide closure seals or use with flexible bags wherein mating .
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contact between slap and front is not needed to eject closure. It is a further object ox this invention to provide a flexible bag with an i openable and resealable closure. It is another object still to provide a closure for a flexible bag in Which the bag may be pitted to the object contained therein and the closure may be used to maintain the I It is another object no this invention to provide a flexible bag with a resealable closure which exhibits good shear strength.
These and other objects ox the invention will be apparent from the following description.
The present invention provides a closure suitable for use with flexible bags, such as thermoplastic bags, especially those made prom polyethylene, wherein the closure comprises at least one female channel member or strip affixed to the bag and having a pressure sensitive adhesive layer on an internal potion ox the channel strip such that the thickness of the adhesive layer is less than the interior depth of the wall ox the channel strip. During shipment and storage the walls ox the channel hold the pressure sensitive adhesive layer away from adjacent surfaces to prevent inadvertent sticking.
Sealing of the bag is achieved by contacting the channel strip with a ', surface ox the bag and exerting pressure along the strip whereby the pressure sensitive adhesive is contacted with a substantially slat portion ox the surface and adhered thereto.
In one embodiment of the invention the channel with the ` adhesive layer is positioned on the flap of the byway yin a second embodiment the channel with the adhesive is positioned on the owe ox the bag over which the slap will fold.
A third embodiment comprises two female channel strips j positioned on opposite sides ox a bag opening A double seal is ejected by pressing the two channels into contact such as one wall or bead ox each channel is contacted by the adhesive layer in the opposing channel.
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F-1394 -pa-the present invention in one aspect resides in a closure suitable for use with a flexible bag, the closure comprising at least one female channel strip having a trough between two spreadable channel ribs said female channel strip being affixed to a first surface with the trough of the channel facing away iron the first surface, the channel strip having a pressure sensitive adhesive layer on an internal portion of the channel strip in the trough, the thickness of the adhesive layer being less than the interior height of the channel strip, an a second surface hazing a substantially flat portion which can be pressed into the trough by spreading said channel ribs, whereby a seal is formed by contacting the pressure sensitive adhesive layer with the substantially flat portion of the second surface The present invention additionally provides a resealable flexible bag comprising:
a) a bag body;
b) a closure, wherein the closure comprises:
1) at least one female channel strip having a trough between two spreadable channel ribs, said female channel strip being affixed to a first surface with the trough of the channel strip having a pressure sensitive adhesive layer on an internal portion of the channel strip in the trough, the thickness of the adhesive layer being less than the interior height of the channel strip; and c) a second surface on the jag having a substantially flat portion engaging the trough of the channel strip by spreading said channel ribs.
; m e present invention further provides a thermoplastic bag comprising:
a) a front wall and a back wall, the walls being joined along the major portion of their opposite longitudinal edges and bottom;
b) an open mouth adjacent to the top edge of the front wall, the open mouth of the bag having a flap which is an extension of the front bag wall and having longitudinal edges B
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, which are not joined to the upper- edges of the back wall; and c) a closure comprising:
' 1) a female channel strip affixed to a surface of I one of the wills at a preselected distance from the opening, the channel strip having a trough between two spreadable channel walls;
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2) a pressure sensitive adhesive layer in the trough, the thickness of the adhesive layer being less than the interior , height of the channel walls, the closure being positioned on the' bag such that when the flap is folded over the opening of the i bag, a flat portion of the bag can be pressed into the trough by spreading said channel walls, whereby a seal is formed by contacting the pressure sensitive adhesive layer with the flay portion.
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In the drawings attached to this specification, Rich illustrate various ~rbodiments of the present im7~tion:
Figure 1 is an elevation Al view of a slat sandwich bag having a clue construe ted in accordance with this invention;
Figure 2 is a cross section of Figure 1 taken along line 2-2;
Figure 3 is a cross section of a second embodiment in which the channel adhesive strip is placed on the surface of the bag over which the n a will fold;
Figure 4 is a sectional view ox an enlarged cross-section of the cloture in a sealed position; and Figure 5 is a sectlnnal view ox an enlarged cross-section of a third embodiment in which two opposing female channel strips are used.
Figures 1 and 2 show a sandwich bag having a closure constructed in accordance with this invention. A bag or bag body comprises a front wall 10 overlying a back wall 11 from which a slap portion 12 extends Front wall 10 is attached to back wall 11 along longitudinal edges 19 and bottom 13~ thereby arming an open mouth adjacent to the top edge of the front wall. The hag may be constructed with a gusset aye and an interior fold of film or flap 14 to better accommodate the thickness of an sect such as a sandwich.
The bag is preferably made out of a plastic film such as polyethylene. Flap 12 has a female channel strip 15 positioned thereon at a preselected distance from the opening. This channel 15 has walls or ribs 17 and a base 18 which comprise a trough.
Preferably base 18 is a layer formed integrally with walls 17.
Channel 15 may be bracketed in a` separate stew and applied Jo the flap 12 or it may be wormed as an integral part ox slap 12, e.g., my a heat de~or~atlon process. Interior to channel 15 is a layer ox pressure sensitive adhesive 16, the thickness ox which should be less than the interior height ox the walls or rips 17 of channel 15 was will be explained in more detail below in Figure 4) and which should preferably be applied to the bottom or vase potion 18 ox channel 15.
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Preferably layer 16 is continuous or uninterrupted. Sealing of the bag is effected by bloodying slap 12 over a substantially flat portion ox front member lo until the bag is positioned around an object.
contained therein, and pressure is applied along the area where channel strip 15 is contacted with front member LO thereby spreading the channel walls 17 open and contacting the adhesive 16 with a sectional strip ox front member lo Figure 3 shows a cross-section ox a second embodiment of this invention in which front wall 20 and back wall 21, with optional gusset 23 and an interior fold ox film or a flap 24, form a bag or bag body. Flap 22 extends prom back member 21. A female channel member 25 with walls 27 end base 28 is positioned on runt wall 20. A layer of adhesive 26 is placed interior to channel walls 27 in a trough preferably on the bottom or base 28 of channel 25 such that the thickness ox the layer of adhesive I is less than the interior height of walls 27 when in an unsealed position. Sealing is effected my positioning slap 22 over channel 25, exerting pressure to spread apart walls 27 thereby contacting a substantially slat section ox flap 22 with adhesive layer 26.
Figure 4 shows a sectional view ox an enlarged cross-section ox the closure ox this invention in a sealed position in which female channel strip 35 with adhesive layer 36 on an internal portion of the channel strip 35 in the trough, is positioned on a surface 30 so that channel 35 assess ~ro~.the.sur~ace. A~second.sur~ace 32 has been-..
contacted with the adhesive layer 36 contained in channel strip 35 and has been pressed into the trough of the channel and into intimate contact with the adhesive layer, thus effecting sealing of the closure While the portion ox surface 32 that is contacted with adhesive layer 36 was initially substantially slat, some deformation has taken place as may be seen in Figure 4. The amount ox adhesive contained in the channel structure may be varied as desired, but it :, F-1394 -6- ~L2~L32S;l , Jo :.
should nut exceed the interior height r of the walls 37 of channel ', structure 35 when in an unsealed position. The layer ox adhesive 36 may be coated into channel structure I either as a continuous layer or as an interrupted layer, but is preferably applied at the bottom or base 38 as a continuous layer.
A variety ox dimensions may be used or the exterior height x and thickness y ox channel wall 37, interior width z of channel , structure 35, and thickness ox adhesive layer 36. In a particularly preferred embodiment an extruded strip comprising polyethylene is applied to a polyethylene sandwich bag surface by means of a hot melt i technique. A ribbon of pressure sensitive adhesive is positioned between the walls or ribs ox the strip. The channel or ribbon I, structure is constructed so that the height x ox the walls ox the channel is about 40 miss high and the distance z between channel wall 37 is about one-quarter inch apart. The thickness ox each channel wall 37 is constructed to be about 20 Melissa the thickness q of pressure sensitive adhesive layer I is a coating approximately one mix thick, and the surface layer 30 ox polyethylene is about jive miss thick. ``~
In an alternate embodiment, a set ox two extruded beads or ribs may also be used to form a channel strip analogous to the j embodiment shown in Figures 2-4. The channel strip ox such an ; embodiment would have a base comprising a portion of the film Syria between thought reads,. and..a,layer ox adhesive would ye positioned on the surface within the area defined by the beads Figure 5 shows a third embodiment ox this invention compxlsing two female channel members, aye and 45b. The first female channel strip aye is positioned on a surface 40. First channel strip aye has a wall aye. A layer ox pressure sensitive adhesive aye is I: positioned interior to lust channel strip aye and should be less than I the interior height ox first channel strip Ann in an unsealed us:
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position. A second Smalley channel strip 45b is constructed to be su~stantlally identical to the rut channel strip with channel walls 47b, and adhesive layer 4Sb. The second channel member is positioned on second surface 50. The bag may be closed so that one seal it wormed between a portion ox the adhesive layer aye and thy top portion 48b ox a channel wall 47b, and a second seal I wormed between a portion of the adhesive layer 46b and the top portion 48~ ox a channel well aye.
Alternatively, each ox the female channel strips USA and 4sb may be wormed by extruding two bead, positioning them on a bag closure Syria a preselected distance apart and applying the adhesive layer directly lo a portion ox the surface ox the film which is between the two beads. Particularly preferred dimensions for this alternate embod~ent are beads 10 miss in diameter spaced prom about
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In the drawings attached to this specification, Rich illustrate various ~rbodiments of the present im7~tion:
Figure 1 is an elevation Al view of a slat sandwich bag having a clue construe ted in accordance with this invention;
Figure 2 is a cross section of Figure 1 taken along line 2-2;
Figure 3 is a cross section of a second embodiment in which the channel adhesive strip is placed on the surface of the bag over which the n a will fold;
Figure 4 is a sectional view ox an enlarged cross-section of the cloture in a sealed position; and Figure 5 is a sectlnnal view ox an enlarged cross-section of a third embodiment in which two opposing female channel strips are used.
Figures 1 and 2 show a sandwich bag having a closure constructed in accordance with this invention. A bag or bag body comprises a front wall 10 overlying a back wall 11 from which a slap portion 12 extends Front wall 10 is attached to back wall 11 along longitudinal edges 19 and bottom 13~ thereby arming an open mouth adjacent to the top edge of the front wall. The hag may be constructed with a gusset aye and an interior fold of film or flap 14 to better accommodate the thickness of an sect such as a sandwich.
The bag is preferably made out of a plastic film such as polyethylene. Flap 12 has a female channel strip 15 positioned thereon at a preselected distance from the opening. This channel 15 has walls or ribs 17 and a base 18 which comprise a trough.
Preferably base 18 is a layer formed integrally with walls 17.
Channel 15 may be bracketed in a` separate stew and applied Jo the flap 12 or it may be wormed as an integral part ox slap 12, e.g., my a heat de~or~atlon process. Interior to channel 15 is a layer ox pressure sensitive adhesive 16, the thickness ox which should be less than the interior height ox the walls or rips 17 of channel 15 was will be explained in more detail below in Figure 4) and which should preferably be applied to the bottom or vase potion 18 ox channel 15.
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Preferably layer 16 is continuous or uninterrupted. Sealing of the bag is effected by bloodying slap 12 over a substantially flat portion ox front member lo until the bag is positioned around an object.
contained therein, and pressure is applied along the area where channel strip 15 is contacted with front member LO thereby spreading the channel walls 17 open and contacting the adhesive 16 with a sectional strip ox front member lo Figure 3 shows a cross-section ox a second embodiment of this invention in which front wall 20 and back wall 21, with optional gusset 23 and an interior fold ox film or a flap 24, form a bag or bag body. Flap 22 extends prom back member 21. A female channel member 25 with walls 27 end base 28 is positioned on runt wall 20. A layer of adhesive 26 is placed interior to channel walls 27 in a trough preferably on the bottom or base 28 of channel 25 such that the thickness ox the layer of adhesive I is less than the interior height of walls 27 when in an unsealed position. Sealing is effected my positioning slap 22 over channel 25, exerting pressure to spread apart walls 27 thereby contacting a substantially slat section ox flap 22 with adhesive layer 26.
Figure 4 shows a sectional view ox an enlarged cross-section ox the closure ox this invention in a sealed position in which female channel strip 35 with adhesive layer 36 on an internal portion of the channel strip 35 in the trough, is positioned on a surface 30 so that channel 35 assess ~ro~.the.sur~ace. A~second.sur~ace 32 has been-..
contacted with the adhesive layer 36 contained in channel strip 35 and has been pressed into the trough of the channel and into intimate contact with the adhesive layer, thus effecting sealing of the closure While the portion ox surface 32 that is contacted with adhesive layer 36 was initially substantially slat, some deformation has taken place as may be seen in Figure 4. The amount ox adhesive contained in the channel structure may be varied as desired, but it :, F-1394 -6- ~L2~L32S;l , Jo :.
should nut exceed the interior height r of the walls 37 of channel ', structure 35 when in an unsealed position. The layer ox adhesive 36 may be coated into channel structure I either as a continuous layer or as an interrupted layer, but is preferably applied at the bottom or base 38 as a continuous layer.
A variety ox dimensions may be used or the exterior height x and thickness y ox channel wall 37, interior width z of channel , structure 35, and thickness ox adhesive layer 36. In a particularly preferred embodiment an extruded strip comprising polyethylene is applied to a polyethylene sandwich bag surface by means of a hot melt i technique. A ribbon of pressure sensitive adhesive is positioned between the walls or ribs ox the strip. The channel or ribbon I, structure is constructed so that the height x ox the walls ox the channel is about 40 miss high and the distance z between channel wall 37 is about one-quarter inch apart. The thickness ox each channel wall 37 is constructed to be about 20 Melissa the thickness q of pressure sensitive adhesive layer I is a coating approximately one mix thick, and the surface layer 30 ox polyethylene is about jive miss thick. ``~
In an alternate embodiment, a set ox two extruded beads or ribs may also be used to form a channel strip analogous to the j embodiment shown in Figures 2-4. The channel strip ox such an ; embodiment would have a base comprising a portion of the film Syria between thought reads,. and..a,layer ox adhesive would ye positioned on the surface within the area defined by the beads Figure 5 shows a third embodiment ox this invention compxlsing two female channel members, aye and 45b. The first female channel strip aye is positioned on a surface 40. First channel strip aye has a wall aye. A layer ox pressure sensitive adhesive aye is I: positioned interior to lust channel strip aye and should be less than I the interior height ox first channel strip Ann in an unsealed us:
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position. A second Smalley channel strip 45b is constructed to be su~stantlally identical to the rut channel strip with channel walls 47b, and adhesive layer 4Sb. The second channel member is positioned on second surface 50. The bag may be closed so that one seal it wormed between a portion ox the adhesive layer aye and thy top portion 48b ox a channel wall 47b, and a second seal I wormed between a portion of the adhesive layer 46b and the top portion 48~ ox a channel well aye.
Alternatively, each ox the female channel strips USA and 4sb may be wormed by extruding two bead, positioning them on a bag closure Syria a preselected distance apart and applying the adhesive layer directly lo a portion ox the surface ox the film which is between the two beads. Particularly preferred dimensions for this alternate embod~ent are beads 10 miss in diameter spaced prom about
3/32 inch to about 3/16 inch apart with an adh~slve layer at least about 1 mix thick. The beads should be made Prom a relatively sot material comprising polyethylene with little or no slip additive.
Adhesives having good peel strength are also purred.
The c10sures ox Thea invention are also useful with adhesive systems such as those comprising at least two layers ox adhesive ayatollah as disclosed in US. Patent owe 4,415,087 of WAGE. Clayton et at, issue November 15? 19~3 said patent being entitled "Laminated Pressure Sensitive Adhesive System for Use in Plastic Bags".
: . Additives may Boyce on thy channel opposition to improve .
Adonis to the bag. In an espscia11y preferred embodiment, a bag body comprising polyethylene is used with a separately extruded channel structure of the type seen in an enlarge view in Figures 4 and 5. The channel structure comprises about 83~ by weight polyethylene and about 17% by weight ethylene vinyl asset and is separately extruded and applied to a portion ox the bag surface.
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The closures of this invention afford protection ox the adhesive material when not in use, and allow a stronger adhesive to be used since the adhesive layer is protected against accidental contact with other surfaces. Since a stronger adhesive can be used, the surface pressed into contact with the adhesive layer is not profiled and thus does not need Jo achieve registration with the channel structure in which the adhesive layer is present.
Pluralities of these closures may also be used so that a bag may have two or more closure structures. The channel strips may optionally be colored in order to more easily locate their position on the bag.
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Adhesives having good peel strength are also purred.
The c10sures ox Thea invention are also useful with adhesive systems such as those comprising at least two layers ox adhesive ayatollah as disclosed in US. Patent owe 4,415,087 of WAGE. Clayton et at, issue November 15? 19~3 said patent being entitled "Laminated Pressure Sensitive Adhesive System for Use in Plastic Bags".
: . Additives may Boyce on thy channel opposition to improve .
Adonis to the bag. In an espscia11y preferred embodiment, a bag body comprising polyethylene is used with a separately extruded channel structure of the type seen in an enlarge view in Figures 4 and 5. The channel structure comprises about 83~ by weight polyethylene and about 17% by weight ethylene vinyl asset and is separately extruded and applied to a portion ox the bag surface.
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The closures of this invention afford protection ox the adhesive material when not in use, and allow a stronger adhesive to be used since the adhesive layer is protected against accidental contact with other surfaces. Since a stronger adhesive can be used, the surface pressed into contact with the adhesive layer is not profiled and thus does not need Jo achieve registration with the channel structure in which the adhesive layer is present.
Pluralities of these closures may also be used so that a bag may have two or more closure structures. The channel strips may optionally be colored in order to more easily locate their position on the bag.
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Claims (36)
1. A closure suitable for use with a flexible bag, the closure comprising at least one female channel strip having a trough between two spreadable channel ribs, said female channel strip being affixed to a first surface with the trough of the channel facing away from the first surface, the channel strip having a pressure sensitive adhesive layer on an internal portion of the channel strip in the trough, the thickness of the adhesive layer being less than the interior height of the channel strip, and a second surface having a substantially flat portion which can be pressed into the trough by spreading said channel ribs, whereby a seal is formed by contacting the pressure sensitive adhesive layer with the substantially flat portion of the second surface.
2. The closure of claim 1 wherein the channel strip is fabricated as a separate member and attached to the flexible bag.
3. The closure of claim 1 or 2 wherein the channel strip is attached to a flap of the flexible bag.
4. The closure of claim 1 or 2 wherein the channel strip is attached to a front wall of the flexible bag.
5. A resealable flexible bag comprising:
a) a bag body;
b) a closure, wherein the closure comprises:
1) at least one female channel strip having a trough between two spreadable channel ribs, said female channel strip being affixed to a first surface with the trough of the channel strip having a pressure sensitive adhesive layer on an internal portion of the channel strip in the trough, the thickness of the adhesive layer being less than the interior height of the channel strip; and c) a second surface on the bag having a substantially flat portion engaging the trough of the channel strip by spreading said channel ribs.
a) a bag body;
b) a closure, wherein the closure comprises:
1) at least one female channel strip having a trough between two spreadable channel ribs, said female channel strip being affixed to a first surface with the trough of the channel strip having a pressure sensitive adhesive layer on an internal portion of the channel strip in the trough, the thickness of the adhesive layer being less than the interior height of the channel strip; and c) a second surface on the bag having a substantially flat portion engaging the trough of the channel strip by spreading said channel ribs.
6. The resealable flexible bag of claim 5 wherein the bag body and the channel strip comprise polyethylene.
7. The resealable flexible bag of claim 5 wherein the closure further comprises a second female channel strip positioned on the second surface, the second channel strip having a pressure sensitive adhesive layer on an internal portion of the second channel strip such that the thickness of the adhesive layer in the second channel strip is less than the interior height of the second channel strip.
8. The resealable flexible bag of claim 7 wherein the first female channel strip and the second female channel strip are each formed by placing two beads of polyethylene a preselected distance apart whereby the first channel strip is formed on the first surface and the second channel strip is formed on the second surface.
9. A thermoplastic bag comprising:
a) a front wall and a back wall, the walls being joined along the major portion of their opposite longitudinal edges and bottom;
b) an open mouth adjacent to the top edge of the front wall, the open mouth of the bag having a flap which is an extension of the front bag wall and having longitudinal edges which are not joined to the upper edges of the back wall; and c) a closure comprising:
1) a female channel strip affixed to a surface of one of the walls at a preselected distance from the opening, the channel strip having a trough between two spreadable channel walls; and 2) a pressure sensitive adhesive layer in the trough, the thickness of the adhesive layer being less than the interior height of the channel walls, the closure being positioned on the bag such that when the flap is folded over the opening of the bag, a flat portion of the bag can be pressed into the trough by spreading said channel walls, whereby a seal is formed by contacting the pressure sensitive adhesive layer with the flat portion.
a) a front wall and a back wall, the walls being joined along the major portion of their opposite longitudinal edges and bottom;
b) an open mouth adjacent to the top edge of the front wall, the open mouth of the bag having a flap which is an extension of the front bag wall and having longitudinal edges which are not joined to the upper edges of the back wall; and c) a closure comprising:
1) a female channel strip affixed to a surface of one of the walls at a preselected distance from the opening, the channel strip having a trough between two spreadable channel walls; and 2) a pressure sensitive adhesive layer in the trough, the thickness of the adhesive layer being less than the interior height of the channel walls, the closure being positioned on the bag such that when the flap is folded over the opening of the bag, a flat portion of the bag can be pressed into the trough by spreading said channel walls, whereby a seal is formed by contacting the pressure sensitive adhesive layer with the flat portion.
10. The bag recited in claim 9 wherein the female channel is positioned on the flap so that when the flap is folded over the open mouth a flat portion of the front wall can be pressed into the trough whereby a seal is formed by contacting the pressure sensitive adhesive layer with the flat portion of the front wall.
11. The bag recited in claim 9 wherein the female channel is positioned on the front wall of the bag with the trough of the channel facing away from the front wall, so that when the flap is folded over the open mouth, a flat portion of the flap can be pressed into the trough whereby a seal is formed by contacting the pressure sensitive adhesive layer with the flat portion of the flap.
12. The closure of claim 1 wherein the female channel strip has a substantially U-shaped cross-sectional configuration.
13. The bag of claim 5 wherein the female channel strip has a substantially U-shaped cross-sectional configuration.
14. The bag of claim 9 wherein the female channel strip has a substantially U-shaped cross-sectional configuration.
15. The closure of claim 1 wherein the adhesive layer disposed in said trough extends uninterrupted and continuous across a substantial portion of the first surface.
16. The bag of claim 5 wherein the adhesive layer disposed in said trough extends uninterrupted and continuous across a substantial portion of the first surface.
17. The bag of claim 9 wherein the adhesive layer disposed in said trough extends uninterrupted and continuous across a substantial portion of the first surface.
18. A flexible thermoplastic bag comprising:
a front wall and a back wall, said walls being joined along the major portion of their opposite longitudinal edges and bottom;
an open mouth adjacent to the top edge of said front wall, said open mouth of said bag having a flap which is an extension of the back bag wall and having longitudinal edges which are not joined to the upper edges of said back wall; and a closure comprising:
a female charnel strip affixed to a surface of one of said front wall or said flap at a preselected distance from said opening, said channel strip having a trough between two spreadable channel ribs wherein the height of the interior walls of said channel ribs is about 40 mils, the distance between the interior walls of said channel is about one-quarter inch, and the thickness of each of said channel ribs is about 20 mils;
and a pressure sensitive adhesive layer in said trough, the thickness of said adhesive layer being less than the interior height of said channel ribs, said closure being positioned on said bag such that when said flap is folded over the opening of said bag, a flat deformable portion of said bag is pressable into said trough by spreading said channel ribs, whereby a seal is formed without a need for mating registration between said female channel strip and any particular portion of said flat deformable portion of said bag by contacting said pressure sensitive adhesive layer with said flat deformable portion.
a front wall and a back wall, said walls being joined along the major portion of their opposite longitudinal edges and bottom;
an open mouth adjacent to the top edge of said front wall, said open mouth of said bag having a flap which is an extension of the back bag wall and having longitudinal edges which are not joined to the upper edges of said back wall; and a closure comprising:
a female charnel strip affixed to a surface of one of said front wall or said flap at a preselected distance from said opening, said channel strip having a trough between two spreadable channel ribs wherein the height of the interior walls of said channel ribs is about 40 mils, the distance between the interior walls of said channel is about one-quarter inch, and the thickness of each of said channel ribs is about 20 mils;
and a pressure sensitive adhesive layer in said trough, the thickness of said adhesive layer being less than the interior height of said channel ribs, said closure being positioned on said bag such that when said flap is folded over the opening of said bag, a flat deformable portion of said bag is pressable into said trough by spreading said channel ribs, whereby a seal is formed without a need for mating registration between said female channel strip and any particular portion of said flat deformable portion of said bag by contacting said pressure sensitive adhesive layer with said flat deformable portion.
19. The bag recited in claim 18 wherein said female channel strip is positioned on said flap so that when said flap is folded over said open mouth a flat portion of said front wall can be pressed into said trough whereby a seal is formed by contacting said pressure sensitive adhesive layer with said flat portion of said front wall.
20. The bag recited in claim 18 wherein said female channel strip is positioned on said front wall of said bag with said trough of said channel facing away from said front wall, so that when said flap is folded over said open mouth, a flat portion of said flap can be pressed into said trough whereby a seal is formed by contacting said pressure sensitive adhesive layer with said flat portion of said flap.
21. The bag recited in claim 18 wherein said female channel strip extends the length of said open mouth, and wherein said pressure sensitive adhesive layer is continuous in said trough, whereby a continuous seal is formed by contacting said pressure sensitive adhesive layer with said flat portion.
22. The bag recited in claim 18 wherein said channel strip comprises about 83% by weight polyethylene and about 17%
by weight ethylene vinyl acetate, and wherein the bag comprises polyethylene.
by weight ethylene vinyl acetate, and wherein the bag comprises polyethylene.
23. The bag recited in claim 22 wherein the thickness of said pressure sensitive layer is about one mil.
24. The bag recited in claim 18 wherein the thickness of said pressure sensitive layer is about one mil.
25. The bag recited in claim 18 wherein said female channel strip comprises two extruded beads forming said channel ribs on said one of said front wall or said flap.
26. A resealable flexible bag comprising:
opposing first and second surfaces;
a first channel strip having a trough between two channel ribs affixed to said first surface with said trough thereof facing away from said first surface, said first channel strip having a pressure sensitive adhesive layer on an internal portion of said first channel strip in said trough, the thickness of said adhesive layer being less than the interior height of said first channel strip; and a second channel strip having a trough between two channel ribs positioned on said second surface with said trough thereof facing away from said second surface, said second channel strip having a pressure sensitive adhesive layer on an internal portion of said second channel strip such that the thickness of said adhesive layer in said second channel strip is less than the interior height of said second channel strip;
said second channel strip being parallelly offset from said first channel strip, whereby one of said channel ribs of said first channel strip is seated in the trough of said second channel strip and one of said channel ribs of said second channel strip is seated in the trough of said first channel strip to releasably seal said flexible bag.
opposing first and second surfaces;
a first channel strip having a trough between two channel ribs affixed to said first surface with said trough thereof facing away from said first surface, said first channel strip having a pressure sensitive adhesive layer on an internal portion of said first channel strip in said trough, the thickness of said adhesive layer being less than the interior height of said first channel strip; and a second channel strip having a trough between two channel ribs positioned on said second surface with said trough thereof facing away from said second surface, said second channel strip having a pressure sensitive adhesive layer on an internal portion of said second channel strip such that the thickness of said adhesive layer in said second channel strip is less than the interior height of said second channel strip;
said second channel strip being parallelly offset from said first channel strip, whereby one of said channel ribs of said first channel strip is seated in the trough of said second channel strip and one of said channel ribs of said second channel strip is seated in the trough of said first channel strip to releasably seal said flexible bag.
27. The bag recited in claim 26 wherein each of said channel strips comprises two extruded beads forming the respective channel ribs on the respective one of said first and second surfaces.
28. A flexible thermoplastic bag comprising an open mouth, at least one female channel strip affixed to a first surface at a preselected distance from said open mouth, said channel strip having a trough between two spreadable channel ribs wherein the height of the interior walls of said channel ribs is about 40 mils, the distance between the interior walls of said channel is about one-fourth inch, and the thickness of each of said channel ribs is about 20 mils, said trough facing away from said first surface, a pressure sensitive adhesive layer on an internal portion of said channel strip in said trough, the thickness of said adhesive layer being less than the interior height of said channel ribs, and a second surface having a substantially flat deformable portion which is pressable into said trough by spreading said channel ribs, whereby a seal is formed without a need for mating registration between said female channel strip and any particular portion of said flat deformable portion of said bag by contacting said pressure sensitive adhesive layer with said substantially flat deformable portion of said second surface.
29. The bag of claim 28 wherein said channel strip is fabricated as a separate member and attached to said flexible bag.
30. The bag of claim 28 wherein said channel strip is attached to a flap of said flexible bag.
31. The bag of claim 28 wherein said channel strip is attached to a front wall of said flexible bag and a rear wall of said flexible bag has a flap.
32. The bag of claim 28 wherein said channel strip comprises about 83% by weight polyethylene and about 17% by weight ethylene vinyl acetate, and wherein the bag comprises polyethylene.
33. The bag of claim 22 wherein the thickness of said pressure sensitive layer is about one mil.
34. The bag of claim 28 wherein the thickness of said pressure sensitive layer is about one mil.
35. The bag of claim 28 wherein said female channel strip extends the length of said open mouth, and wherein said pressure sensitive adhesive layer is continuous in said trough, whereby a continuous seal is formed by contacting said pressure sensitive adhesive layer with said first flat portion.
36. The bag of claim 28 wherein said female channel strip comprises two extruded beads forming said channel ribs on a front wall or a flap.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US33579881A | 1981-12-30 | 1981-12-30 | |
| US335,798 | 1981-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1213251A true CA1213251A (en) | 1986-10-28 |
Family
ID=23313256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000416469A Expired CA1213251A (en) | 1981-12-30 | 1982-11-26 | Adhesive channel closure for flexible bags |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1213251A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5527112A (en) * | 1994-04-15 | 1996-06-18 | Dowbrands L.P. | Adhesive closure for flexible bag |
| US5564834A (en) * | 1994-04-15 | 1996-10-15 | Dowbrands L.P. | Adhesive closure having enhanced burst strength for flexible bag |
| US5791783A (en) * | 1994-04-15 | 1998-08-11 | Dowbrands L.P. | Adhesive closure having enhanced burst strength for flexible bag |
| US5832145A (en) * | 1994-04-15 | 1998-11-03 | Dowbrands L.P. | Adhesive closure for flexible bag |
-
1982
- 1982-11-26 CA CA000416469A patent/CA1213251A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5527112A (en) * | 1994-04-15 | 1996-06-18 | Dowbrands L.P. | Adhesive closure for flexible bag |
| US5564834A (en) * | 1994-04-15 | 1996-10-15 | Dowbrands L.P. | Adhesive closure having enhanced burst strength for flexible bag |
| US5783012A (en) * | 1994-04-15 | 1998-07-21 | Dowbrands L.P. | Adhesive closure having enhanced burst strength for flexible bag |
| US5791783A (en) * | 1994-04-15 | 1998-08-11 | Dowbrands L.P. | Adhesive closure having enhanced burst strength for flexible bag |
| US5832145A (en) * | 1994-04-15 | 1998-11-03 | Dowbrands L.P. | Adhesive closure for flexible bag |
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| Date | Code | Title | Description |
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| MKEX | Expiry |