US20050063617A1 - Reclosable bag having tamper-evident membrane - Google Patents
Reclosable bag having tamper-evident membrane Download PDFInfo
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- US20050063617A1 US20050063617A1 US10/843,235 US84323504A US2005063617A1 US 20050063617 A1 US20050063617 A1 US 20050063617A1 US 84323504 A US84323504 A US 84323504A US 2005063617 A1 US2005063617 A1 US 2005063617A1
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- Prior art keywords
- flexible
- frangible membrane
- tamper
- sealing flange
- sealing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/25—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners
- B65D33/2508—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor
- B65D33/2516—Riveting; Dovetailing; Screwing; using press buttons or slide fasteners using slide fasteners with interlocking members having a substantially uniform section throughout the length of the fastener; Sliders therefor comprising tamper-indicating means, e.g. located within the fastener
Definitions
- the present invention concerns reclosable packages.
- the present invention describes packages having slider devices for opening and closing the packages, and also having one or more tamper-evident structures.
- Flexible packages in particular resealable and recloseable packages, are frequently used for packaging of consumable goods. Goods that are not used completely when the package is initially opened rely on a zipper closure to reclose the package and keep the remaining contents fresh. Examples of consumable goods that are often packaged in packages, such as bags, with a zipper closure include potting soil, fertilizer, pet food, dog biscuits, vegetables, cereal, and many different foods edible by humans, including shredded cheese.
- the opening and closing of the zipper closure is facilitated by a slider device that is mounted on the zipper closure.
- the slider device is constructed to pry apart the interlocking zipper closure members when the slider device is moved in a first direction along the zipper, and to engage the interlocking zipper closure members when the slider device is moved in a second, opposite direction along the zipper.
- a tamper-evident structure to notify whether access has been gained to package contents, is desired. Improvements in these types of packages are desirable.
- the present disclosure relates to a flexible bag, having a resealable, reclosable zipper closure mechanism, opening and closing of which is accomplished by a slider device.
- the slider device is constructed and arranged for mounting on the closure construction and for interlocking and disengaging the first mating profile with the second mating profile.
- a first tamper-evident seal is provided on the exterior of the zipper closure so as to provide evidence whether access has been gained to the package.
- an internal tamper-evident structure such as a second tamper-evident structure is included in the package to protect the package contents and isolate those contents from external atmosphere effects, which will degrade the food products.
- the disclosure is directed to a flexible, reclosable package comprising first and second panel sections defining an interior.
- a zipper closure is sealed to each of first and second panel sections along a top edge of the package, the zipper closure extending from a first side edge to a second side edge and comprising first and second mating profiles.
- a slider device constructed and arranged for mounting on the zipper closure and for interlocking the first mating profile with the second mating profile when the slider device is moved in a first direction and disengaging the first mating profile from the second mating profile when the slider device is moved in a second opposite direction, is operably mounted on the zipper closure.
- Disposed at the top edge and encasing a first portion of the zipper closure is a first tamper-evident structure.
- the first tamper-evident structure may have an opening exposing the slider device or may completely cover the slider device.
- the zipper closure of the present invention includes a frangible membrane that extends across the open interior of the reclosable package between the opposed sealing flanges formed on the opposed mating profiles.
- the frangible membrane is formed in part of a material having a lower strength than the material forming the mating profiles such that the frangible membrane ruptures upon initial opening of the reclosable package.
- the frangible membrane can be formed of a material similar to the material forming the mating profiles with the frangible membrane including a line or area of weakness that allows the frangible membrane to rupture along the line of weakness.
- the frangible membrane provides a hermetic seal between the mating profiles prior to initial opening of the product package.
- FIG. 1 is a front plan view of a first embodiment of a flexible, reclosable package having a slider device and a pair of tamper-evident structures;
- FIG. 2 is a cross-sectional view of the flexible, reclosable package taken along line 2 - 2 of FIG. 1 ;
- FIG. 3 is a cross-sectional view of a second embodiment of a flexible, reclosable package analogous to the view taken along line 2 - 2 of FIG. 1 ;
- FIG. 4 is a front plan view of the flexible, reclosable package of FIGS. 1 and 2 with the top tamper-evident structure removed to expose the slider;
- FIG. 5 is a perspective view illustrating the opening of the reclosable package after the top tamper-evident structure has been removed and the second tamper-evident structure is being ruptured;
- FIG. 6 is a cross-sectional view illustrating the tamper-evident zipper closure of the present invention.
- FIG. 7 a is a cross-sectional view of a second embodiment of a tamper-evident zipper closure for use on a flexible, reclosable package.
- FIG. 7 b is a view of the embodiment shown in FIG. 7 a , further depicting sealing jaws for sealing the tamper-evident zipper closure to the package side panels.
- a slider device to a flexible package, such as a bag, is advantageous to aging or arthritic persons not having the physical ability to use just a zipper closure to reseal a bag. Additionally, the addition of a slider device to a flexible package facilitates the use of the bag by users of all ages and abilities. The presence of an external tamper-evident structure provides assurance that undesired access has not been gained to the interior and contents of the package.
- FIGS. 1 and 2 A flexible, reclosable package 10 is shown in FIGS. 1 and 2 .
- Package 10 includes four edges, a first side edge 13 , a bottom edge 15 , a second side edge 17 , and a top edge 19 .
- Providing the structure of package 10 are polymeric film side panels 12 and 14 ( FIG. 2 ), which, with edges 13 , 15 , 17 , define an interior 11 , as best seen in FIG. 2 .
- Side panels 12 , 14 are connected to each other at each of side edges 13 , 17 , bottom edge 15 , and top edge 19 .
- side edges 13 , 17 are seals created by the application of heat and pressure to side panels 12 , 14 .
- bottom edge 15 is a fold line between side panels 12 , 14 , which is formed when a single sheet of film is folded to form the two side panels.
- bottom edge 15 can be a seal created by the application of heat and pressure to side panels 12 , 14 .
- a zipper closure arrangement 20 (shown partially in phantom in FIG. 1 ) having mating closure profiles to open and close (unseal and reseal) the package 10 extends from first side edge 13 to second side edge 17 in close proximity to top edge 19 of package 10 , as seen in FIG. 1 .
- the zipper closure 20 can include a variety of configurations and structures. Zipper closure 20 can be configured in any known manner, for example, such as disclosed in U.S. Pat. Nos. 4,240,241; 4,246,288; and 4,437,293; each of which is incorporated by reference herein.
- zipper closure 20 is illustrated with mating closure profiles such as a first mating profile 22 and a second mating profile 24 .
- First mating profile 22 and second mating profile 24 engage and disengage, as appropriate, to open and close package 10 . Still referring to FIG. 2 , first and second mating profiles 22 , 24 of zipper closure 20 are attached to the inside of side panels 12 , 14 , respectively, by sealing flanges 26 , 28 , respectively.
- a slider device 30 is mounted on zipper closure 20 to facilitate opening and closing of zipper closure 20 .
- Slider devices and how they function to open and close zipper closures, in general, are taught for example, in U.S. Pat. Nos. 5,063,644; 5,301,394; 5,442,837, and 5,664,229, each of which is incorporated by reference herein.
- a preferred slider device is taught in U.S. Pat. Nos. 6,293,701 and D434,345 and incorporated herein by reference in their entirety.
- slider device 30 is preferably constructed and arranged in accordance with the disclosures of the U.S. Pat. Nos. 6,293,701 and D434,345.
- Two portions of zipper closure 20 act as slider stop areas; these slider stop areas are preferably crushed, such as by ultrasonic crushing, at crush areas 23 , 27 in FIG. 1 .
- These slider stop areas or crush areas 23 , 27 securely seal first and second mating profiles 22 , 24 together to minimize the chance of slider device 30 sliding off the side edges 13 , 17 of package 10 .
- the slider stop areas or crush areas 23 , 27 further minimize the tendency for slider device 30 to abut against either of first side edge 13 or second side edge 17 .
- a notch (not shown) is preferably disposed within zipper closure 20 .
- the notch is designed to provide a “park place” into which slider device 30 settles when zipper closure 20 is sealed. Such a notch may decrease any tendency for an incomplete interlock between first mating profile 22 and second mating profile 24 . Examples of notches are disclosed, for example, in U.S. Pat. Nos. 5,067,208 and 5,301,395, each of which is incorporated by reference herein.
- package 10 includes a first tamper-evident structure 35 disposed at top edge 19 to retain slider device 30 close to first side edge 13 and preferably within a notch.
- tamper-evident it is meant that it provides an indication to the consumer as to whether the package 10 has been previously opened.
- the tamper-evident structure 35 needs to be penetrated.
- tamper-evident structure 35 covers and forms a complete enclosure around a majority of the zipper closure 20 . As best seen in FIG.
- tamper-evident structure 35 extends from below zipper closure 20 and encases and surrounds first and second mating profiles 22 , 24 of zipper closure 20 . Further, tamper-evident structure 35 extends from first side edge 13 ( FIG. 1 ) along top edge 19 to second side edge 17 and encases the majority of zipper closure 20 .
- Tamper-evident structure 35 is formed by sealing the tops of side panels 12 , 14 over zipper closure 20 at top edge 19 , as best seen in FIG. 2 .
- the seal along top edge 19 of tamper-evident structure 35 is continuous; that is, with no unsealed lengths between side panels 12 , 14 along top edge 19 .
- spot sealing along top edge 19 may be acceptable.
- the seal may rip or tear, leaving small lengths of unsealed top edge 19 .
- Each end of tamper-evident structure 35 is also preferably continuously sealed; that is, preferably tamper-evident structure is sealed along first side edge 13 and second side edge 17 so that access cannot be gained to zipper closure 20 through the ends of tamper-evident structure 35 .
- Any sealing can be done by ultrasonic welding, thermal sealing, crushing, mechanical attachments, adhesive or solvent, or any combination thereof.
- FIG. 3 thereshown is an alternate embodiment of the tamper-evident structure 35 .
- the side panels 12 , 14 are connected to each other by a folded area 37 .
- the first and second side panels 12 , 14 are formed from a continuous sheet of material that is joined along a bottom end 39 .
- the package is filled through the bottom end 39 and subsequently sealed along a longitudinal seal 41 between the side panel 12 and 14 .
- first tamper-evident structure 35 includes an area of weakness 38 , which allows for easy removal of tamper-evident structure 35 .
- area of weakness 38 is a perforation line, laser score, tear-strip, zip strip, or any type of weakened area that allows for easy removal of tamper-evident structure 35 to expose zipper closure 20 so that slider device 30 can be moved.
- Area of weakness 38 extends along the length of tamper evident-structure 35 and is positioned below zipper closure 20 , to minimize any remnants of tamper evident-structure 35 that could interfere with the movement of slider device 30 along zipper closure 20 .
- top edge 29 of package 10 is encased within tamper-evident structure 35 .
- the top edge 29 is defined by first and second mating profiles 22 , 24 .
- the true top edge 29 is exposed and is the top most portion of package 10 , not including slider device 30 . There are no further film sections or other structures that extend above top edge 29 .
- FIG. 4 shows package 10 with tamper-evident structure 35 removed from over zipper closure 20 .
- Top edge 29 is exposed and slider device 30 can be easily moved from first crush area 23 at first side edge 13 along zipper closure 20 to second crush area 27 at second side edge 17 to open zipper closure 20 and gain access to interior 11 .
- Panel edge 40 is exposed where area of weakness 38 used to be. Note that when the tamper-evident structure 35 is removed, there is no significant amount of tamper-evident structure remaining above where area of weakness 38 used to be. There is no material left that may make physical contact with slider device 30 or might otherwise impair movement of slider device 30 along zipper closure 20 .
- a second tamper-evident structure 36 can be positioned between side panels 12 , 14 to provide a second barrier that needs to be broken in order to gain access to interior 11 of package 10 .
- this second tamper-evident structure 36 is considered an internal tamper-evident structure, because it is positioned between the zipper closure 20 and package interior 11 .
- the second tamper-evident structure 36 is a frangible membrane 42 that extends between the sealing flanges 26 , 28 of the first and second mating profiles 22 , 24 .
- the frangible membrane 42 extends along the entire length of the zipper closure 20 .
- the frangible membrane 42 is formed from a material having a strength less than the strength of the sealing flanges 26 , 28 and less than the strength of the seal between the sealing flanges 26 , 28 and the respective side panels 12 , 14 .
- the strength of the frangible membrane 42 can be controlled by the thickness of the material or by the type of material selected.
- the frangible membrane can be formed from a polyolefin, such as HDPE, LDPE, LLDPE, MDPE, or other materials such as polypropylene, EVOH, Saran, Nucrel, foil, or a metalized polyester.
- the frangible membrane 42 can be formed from a material having greater strength and a line of weakness created in the frangible membrane 42 .
- the line of weakness can be a laser score or similar structure that allows the frangible membrane 42 to rupture along the line of weakness when the zipper closure 20 is opened and the mating profiles 22 , 24 pulled apart.
- FIG. 6 thereshown is a section view of the zipper closure 20 prior to the application of the zipper closure to the reclosable bag.
- the zipper closure 20 includes the first profile 22 , the second profile 24 and the frangible membrane 42 .
- the frangible membrane 42 extends across the space 44 between the ends 46 and 48 of the sealing flanges 26 , 28 .
- the frangible membrane 42 is formed from a material different than the material used to form the mating profiles 22 , 24 such that the frangible membrane 42 has a lower strength than the mating profiles 22 , 24 .
- the frangible membrane 42 is preferably co-extruded with the profiles 22 and 24 to form the structure shown in FIG. 6 .
- frangible membrane 42 can be attached to the ends 46 , 48 of the sealing flanges 26 , 28 using other material attachment techniques, such as a layer of adhesive or a heat bond between the frangible membrane and the respective sealing flanges 26 , 28 .
- the frangible membrane 42 has a width of 0.75 inches and a thickness of 0.002 inches.
- Each of the sealing flanges 26 , 28 has a preferred thickness of 0.007 inches and a width of 0.937 inches.
- the widths of the structures in the zipper closure 20 are provided for illustrative purposes only, and form no part of the present invention.
- the package 10 of FIGS. 2 and 3 can be manufactured by techniques generally known in the art of packaging.
- side panels 12 , 14 may be formed by a single sheet or web of material that has been folded to form bottom edge 15 , or two sheets of martial can be sealed at the bottom edge 41 , as shown in FIG. 3 .
- Zipper closure 20 is brought between side panels 12 , 14 and sealing flanges 26 , 28 ( FIG. 2 ) of zipper closure 20 are sealed to side panels 12 , 14 .
- a topmost portion of each of side panels 12 , 14 is brought over to encase zipper closure 20 and slider device 30 .
- topmost it is meant the portions of side panels 12 , 14 not defining interior 11 ( FIG. 2 ); in another aspect, “topmost” is meant to refer to the portions of side panels 12 , 14 that form tamper-evident structure 35 .
- the topmost portions of side panels 12 , 14 may be sealed at top edge 19 ( FIG. 2 ) or may be formed by a folded section 37 and tamper-evident structure 35 is formed.
- Opening 31 can be provided in the topmost portions of side panels 12 , 14 before or after the side panels are sealed to form tamper-evident structure 35 . Opening 31 can be formed by die cutting, slitting, laser cutting, or by any such method.
- Side edges 13 , 17 are made typically by thermally sealing, and optionally cutting, side panels 12 , 14 . Side edges 13 , 17 can be made before or after tamper-evident structure 35 is made.
- first tamper-evident structure 35 is removed by tearing along the area of weakness 38 , providing access to the zipper closure 20 and slider device 30 .
- the slider device 30 may then be moved from its position at first side edge 13 ( FIG. 1 ) along zipper closure 20 to second side edge 17 ( FIG. 1 ); movement of slider device 30 along zipper closure 20 unmates first and second mating profiles 22 , 24 ( FIGS. 2 and 3 ) and provides access to interior 11 ( FIG. 2 ).
- the user can grasp the profiles to tear the frangible membrane 42 and gain access to the bag interior 11 .
- a portion of the frangible membrane 42 remains attached to each of the mating profiles 22 , 24 after the bags have been initially opened.
- the profiles 22 , 24 remain sealed, as shown by line 46 , until the profiles 22 , 24 are separated far enough to break the membrane 42 .
- the slider 30 can be moved along the package 10 to provide access to the open interior 11 .
- FIG. 7 a thereshown is a sectional view of an alternate embodiment of the zipper closure 20 prior to the application of the zipper closure to the reclosable bag.
- the zipper closure 20 includes the first profile 22 , the second profile 24 and the frangible membrane 42 .
- the frangible membrane 42 has a first end 46 that is sealed to the sealing flange 26 by a layer of sealant material 50 .
- the frangible membrane 42 further includes a second end 48 that is sealed to the sealing flange 28 by another layer of sealant material 50 .
- the sealant material 50 is an LDPE copolymer where the EVA component exceeds 5%.
- the frangible member 42 is preferably formed from a material different from than the material used to form the mating profiles 22 , 24 such that the frangible membrane 42 has a lower strength than the mating profiles 22 , 24 .
- the frangible membrane 42 is preferably co-extruded with the profiles 22 and 24 to form the structure shown in FIG. 7 a . It is contemplated that the frangible membrane 42 can alternatively be formed from a material having the same strength as the material used to form the mating profiles 22 , 24 . In such a case, the frangible membrane includes a line of weakness that allows the frangible membrane to rupture along the line of weakness during the initial opening of the zipper closure.
- a non-sealing layer 52 is applied to the interior of the first end 46 and second end 48 of the frangible membrane 42 .
- the non-sealing material 52 provides the significant advantage when the sealing flanges 26 , 28 of the zipper closure 20 are sealed to side panels 12 , 14 , as discussed above.
- the non-sealant material is HDPE where the melt point of the HDPE significantly exceeds the melt point of the sealing flanges 26 , 28 and the frangible membrane 42 .
- the preferred embodiment of the non-sealing material is disclosed as being HDPE, it is contemplated by the inventors that the non-sealing material could be formed from other materials while operating within the scope of the present invention.
- the non-sealing material 52 prevents the first end 46 and second end 48 of the frangible membrane 42 from sealing together.
- the frangible membrane 42 may be applied to packages 10 according to techniques for manufacture that are generally well known in the art of packaging.
- the zipper closure 20 may comprise one or more layers of sealing materials 50 , as well as one or more layers of non-sealing materials 52 .
Abstract
Description
- The present application is based on and claims priority to U.S. Provisional Patent Application Ser. No. 60/502,994 filed on Sep. 15, 2003.
- The present invention concerns reclosable packages. In particular, the present invention describes packages having slider devices for opening and closing the packages, and also having one or more tamper-evident structures.
- Flexible packages, in particular resealable and recloseable packages, are frequently used for packaging of consumable goods. Goods that are not used completely when the package is initially opened rely on a zipper closure to reclose the package and keep the remaining contents fresh. Examples of consumable goods that are often packaged in packages, such as bags, with a zipper closure include potting soil, fertilizer, pet food, dog biscuits, vegetables, cereal, and many different foods edible by humans, including shredded cheese.
- Often, the opening and closing of the zipper closure is facilitated by a slider device that is mounted on the zipper closure. The slider device is constructed to pry apart the interlocking zipper closure members when the slider device is moved in a first direction along the zipper, and to engage the interlocking zipper closure members when the slider device is moved in a second, opposite direction along the zipper. For some applications, a tamper-evident structure, to notify whether access has been gained to package contents, is desired. Improvements in these types of packages are desirable.
- The present disclosure relates to a flexible bag, having a resealable, reclosable zipper closure mechanism, opening and closing of which is accomplished by a slider device. The slider device is constructed and arranged for mounting on the closure construction and for interlocking and disengaging the first mating profile with the second mating profile. When the slider device is moved in a first direction, the first mating profile is engaged to the second mating profile; when the slider device is moved in a second opposite direction, the first mating profile is disengaged from the second mating profile. A first tamper-evident seal is provided on the exterior of the zipper closure so as to provide evidence whether access has been gained to the package. Additionally, an internal tamper-evident structure, such as a second tamper-evident structure is included in the package to protect the package contents and isolate those contents from external atmosphere effects, which will degrade the food products.
- In particular, the disclosure is directed to a flexible, reclosable package comprising first and second panel sections defining an interior. A zipper closure is sealed to each of first and second panel sections along a top edge of the package, the zipper closure extending from a first side edge to a second side edge and comprising first and second mating profiles. A slider device, constructed and arranged for mounting on the zipper closure and for interlocking the first mating profile with the second mating profile when the slider device is moved in a first direction and disengaging the first mating profile from the second mating profile when the slider device is moved in a second opposite direction, is operably mounted on the zipper closure. Disposed at the top edge and encasing a first portion of the zipper closure is a first tamper-evident structure. The first tamper-evident structure may have an opening exposing the slider device or may completely cover the slider device.
- The zipper closure of the present invention includes a frangible membrane that extends across the open interior of the reclosable package between the opposed sealing flanges formed on the opposed mating profiles. The frangible membrane is formed in part of a material having a lower strength than the material forming the mating profiles such that the frangible membrane ruptures upon initial opening of the reclosable package. Alternatively, the frangible membrane can be formed of a material similar to the material forming the mating profiles with the frangible membrane including a line or area of weakness that allows the frangible membrane to rupture along the line of weakness. The frangible membrane provides a hermetic seal between the mating profiles prior to initial opening of the product package.
- Methods of making such a package, and methods of using such a package, are also disclosed.
-
FIG. 1 is a front plan view of a first embodiment of a flexible, reclosable package having a slider device and a pair of tamper-evident structures; -
FIG. 2 is a cross-sectional view of the flexible, reclosable package taken along line 2-2 ofFIG. 1 ; -
FIG. 3 is a cross-sectional view of a second embodiment of a flexible, reclosable package analogous to the view taken along line 2-2 ofFIG. 1 ; -
FIG. 4 is a front plan view of the flexible, reclosable package ofFIGS. 1 and 2 with the top tamper-evident structure removed to expose the slider; -
FIG. 5 is a perspective view illustrating the opening of the reclosable package after the top tamper-evident structure has been removed and the second tamper-evident structure is being ruptured; -
FIG. 6 is a cross-sectional view illustrating the tamper-evident zipper closure of the present invention; -
FIG. 7 a is a cross-sectional view of a second embodiment of a tamper-evident zipper closure for use on a flexible, reclosable package; and, -
FIG. 7 b is a view of the embodiment shown inFIG. 7 a, further depicting sealing jaws for sealing the tamper-evident zipper closure to the package side panels. - The addition of a slider device to a flexible package, such as a bag, is advantageous to aging or arthritic persons not having the physical ability to use just a zipper closure to reseal a bag. Additionally, the addition of a slider device to a flexible package facilitates the use of the bag by users of all ages and abilities. The presence of an external tamper-evident structure provides assurance that undesired access has not been gained to the interior and contents of the package.
- A flexible,
reclosable package 10 is shown inFIGS. 1 and 2 .Package 10 includes four edges, afirst side edge 13, abottom edge 15, asecond side edge 17, and atop edge 19. Providing the structure ofpackage 10 are polymericfilm side panels 12 and 14 (FIG. 2 ), which, withedges interior 11, as best seen inFIG. 2 . -
Side panels side edges bottom edge 15, andtop edge 19. InFIG. 1 ,side edges side panels FIG. 2 ,bottom edge 15 is a fold line betweenside panels bottom edge 15 can be a seal created by the application of heat and pressure toside panels - A zipper closure arrangement 20 (shown partially in phantom in
FIG. 1 ) having mating closure profiles to open and close (unseal and reseal) thepackage 10 extends fromfirst side edge 13 tosecond side edge 17 in close proximity totop edge 19 ofpackage 10, as seen inFIG. 1 . Thezipper closure 20 can include a variety of configurations and structures.Zipper closure 20 can be configured in any known manner, for example, such as disclosed in U.S. Pat. Nos. 4,240,241; 4,246,288; and 4,437,293; each of which is incorporated by reference herein. InFIG. 2 ,zipper closure 20 is illustrated with mating closure profiles such as afirst mating profile 22 and asecond mating profile 24.First mating profile 22 andsecond mating profile 24 engage and disengage, as appropriate, to open and closepackage 10. Still referring toFIG. 2 , first andsecond mating profiles zipper closure 20 are attached to the inside ofside panels flanges - A
slider device 30 is mounted onzipper closure 20 to facilitate opening and closing ofzipper closure 20. Slider devices and how they function to open and close zipper closures, in general, are taught for example, in U.S. Pat. Nos. 5,063,644; 5,301,394; 5,442,837, and 5,664,229, each of which is incorporated by reference herein. A preferred slider device is taught in U.S. Pat. Nos. 6,293,701 and D434,345 and incorporated herein by reference in their entirety. Although shown schematically inFIGS. 1 through 4 ,slider device 30 is preferably constructed and arranged in accordance with the disclosures of the U.S. Pat. Nos. 6,293,701 and D434,345. - Two portions of
zipper closure 20, one close tofirst side edge 13 and another close tosecond side edge 17, act as slider stop areas; these slider stop areas are preferably crushed, such as by ultrasonic crushing, atcrush areas FIG. 1 . These slider stop areas or crushareas slider device 30 sliding off the side edges 13, 17 ofpackage 10. The slider stop areas or crushareas slider device 30 to abut against either offirst side edge 13 orsecond side edge 17. - A notch (not shown) is preferably disposed within
zipper closure 20. The notch is designed to provide a “park place” into whichslider device 30 settles whenzipper closure 20 is sealed. Such a notch may decrease any tendency for an incomplete interlock betweenfirst mating profile 22 andsecond mating profile 24. Examples of notches are disclosed, for example, in U.S. Pat. Nos. 5,067,208 and 5,301,395, each of which is incorporated by reference herein. - In
FIGS. 1 and 2 ,package 10 includes a first tamper-evident structure 35 disposed attop edge 19 to retainslider device 30 close tofirst side edge 13 and preferably within a notch. By “tamper-evident”, it is meant that it provides an indication to the consumer as to whether thepackage 10 has been previously opened. In order to access the interior 11 (FIG. 2 ) ofpackage 10, the tamper-evident structure 35 needs to be penetrated. In the embodiment depicted inFIGS. 1 and 2 , tamper-evident structure 35 covers and forms a complete enclosure around a majority of thezipper closure 20. As best seen inFIG. 2 , tamper-evident structure 35 extends from belowzipper closure 20 and encases and surrounds first and second mating profiles 22, 24 ofzipper closure 20. Further, tamper-evident structure 35 extends from first side edge 13 (FIG. 1 ) alongtop edge 19 tosecond side edge 17 and encases the majority ofzipper closure 20. - Tamper-
evident structure 35 is formed by sealing the tops ofside panels zipper closure 20 attop edge 19, as best seen inFIG. 2 . Preferably, the seal alongtop edge 19 of tamper-evident structure 35 is continuous; that is, with no unsealed lengths betweenside panels top edge 19. However, in some embodiments spot sealing alongtop edge 19 may be acceptable. Additionally, in some instances the seal may rip or tear, leaving small lengths of unsealedtop edge 19. Each end of tamper-evident structure 35 is also preferably continuously sealed; that is, preferably tamper-evident structure is sealed alongfirst side edge 13 andsecond side edge 17 so that access cannot be gained tozipper closure 20 through the ends of tamper-evident structure 35. Any sealing can be done by ultrasonic welding, thermal sealing, crushing, mechanical attachments, adhesive or solvent, or any combination thereof. - Referring now to
FIG. 3 , thereshown is an alternate embodiment of the tamper-evident structure 35. As can be seen inFIG. 3 , theside panels area 37. The first andsecond side panels bottom end 39. The package is filled through thebottom end 39 and subsequently sealed along alongitudinal seal 41 between theside panel - In order to gain access to the
package interior 11,slider device 30 must be moved alongzipper closure 20, which can only be done if the first tamper-evident structure 35 has been penetrated; typically first tamper-evident structure 35 has to be removed. The first tamper-evident structure 35 includes an area ofweakness 38, which allows for easy removal of tamper-evident structure 35. In some package embodiments, area ofweakness 38 is a perforation line, laser score, tear-strip, zip strip, or any type of weakened area that allows for easy removal of tamper-evident structure 35 to exposezipper closure 20 so thatslider device 30 can be moved. Area ofweakness 38 extends along the length of tamper evident-structure 35 and is positioned belowzipper closure 20, to minimize any remnants of tamper evident-structure 35 that could interfere with the movement ofslider device 30 alongzipper closure 20. - When tamper-
evident structure 35 is present overzipper closure 20, the truetop edge 29 ofpackage 10 is encased within tamper-evident structure 35. Typically, thetop edge 29 is defined by first and second mating profiles 22, 24. When tamper-evident structure 35 has been removed at area ofweakness 38, the truetop edge 29 is exposed and is the top most portion ofpackage 10, not includingslider device 30. There are no further film sections or other structures that extend abovetop edge 29. -
FIG. 4 shows package 10 with tamper-evident structure 35 removed from overzipper closure 20.Top edge 29 is exposed andslider device 30 can be easily moved fromfirst crush area 23 atfirst side edge 13 alongzipper closure 20 tosecond crush area 27 atsecond side edge 17 to openzipper closure 20 and gain access tointerior 11.Panel edge 40 is exposed where area ofweakness 38 used to be. Note that when the tamper-evident structure 35 is removed, there is no significant amount of tamper-evident structure remaining above where area ofweakness 38 used to be. There is no material left that may make physical contact withslider device 30 or might otherwise impair movement ofslider device 30 alongzipper closure 20. - As illustrated in
FIGS. 2 and 3 , a second tamper-evident structure 36 can be positioned betweenside panels interior 11 ofpackage 10. Generally, this second tamper-evident structure 36 is considered an internal tamper-evident structure, because it is positioned between thezipper closure 20 andpackage interior 11. - As illustrated in
FIGS. 2 and 3 , the second tamper-evident structure 36 is afrangible membrane 42 that extends between the sealingflanges frangible membrane 42 extends along the entire length of thezipper closure 20. In the preferred embodiment of the invention, thefrangible membrane 42 is formed from a material having a strength less than the strength of the sealingflanges flanges respective side panels zipper closure 20 is opened and the mating profiles 22, 24 pulled apart, thefrangible membrane 42 fractures to provide access to the interior 11. The strength of thefrangible membrane 42 can be controlled by the thickness of the material or by the type of material selected. In the embodiment of the invention illustrated, the frangible membrane can be formed from a polyolefin, such as HDPE, LDPE, LLDPE, MDPE, or other materials such as polypropylene, EVOH, Saran, Nucrel, foil, or a metalized polyester. Alternatively, thefrangible membrane 42 can be formed from a material having greater strength and a line of weakness created in thefrangible membrane 42. The line of weakness can be a laser score or similar structure that allows thefrangible membrane 42 to rupture along the line of weakness when thezipper closure 20 is opened and the mating profiles 22, 24 pulled apart. - Referring now to
FIG. 6 , thereshown is a section view of thezipper closure 20 prior to the application of the zipper closure to the reclosable bag. Thezipper closure 20 includes thefirst profile 22, thesecond profile 24 and thefrangible membrane 42. As illustrated, thefrangible membrane 42 extends across thespace 44 between theends flanges frangible membrane 42 is formed from a material different than the material used to form the mating profiles 22, 24 such that thefrangible membrane 42 has a lower strength than the mating profiles 22, 24. Thefrangible membrane 42 is preferably co-extruded with theprofiles FIG. 6 . Alternatively, thefrangible membrane 42 can be attached to theends flanges respective sealing flanges - In a preferred embodiment of the invention, the
frangible membrane 42 has a width of 0.75 inches and a thickness of 0.002 inches. Each of the sealingflanges zipper closure 20 are provided for illustrative purposes only, and form no part of the present invention. - The
package 10 ofFIGS. 2 and 3 can be manufactured by techniques generally known in the art of packaging. In one embodiment shown inFIG. 2 ,side panels bottom edge 15, or two sheets of martial can be sealed at thebottom edge 41, as shown inFIG. 3 .Zipper closure 20 is brought betweenside panels flanges 26, 28 (FIG. 2 ) ofzipper closure 20 are sealed toside panels - A topmost portion of each of
side panels zipper closure 20 andslider device 30. By the term “topmost”, it is meant the portions ofside panels FIG. 2 ); in another aspect, “topmost” is meant to refer to the portions ofside panels evident structure 35. The topmost portions ofside panels FIG. 2 ) or may be formed by a foldedsection 37 and tamper-evident structure 35 is formed. Opening 31 can be provided in the topmost portions ofside panels evident structure 35. Opening 31 can be formed by die cutting, slitting, laser cutting, or by any such method. - Side edges 13, 17 are made typically by thermally sealing, and optionally cutting,
side panels evident structure 35 is made. - To open the bag construction of
FIGS. 2 and 3 , first tamper-evident structure 35 is removed by tearing along the area ofweakness 38, providing access to thezipper closure 20 andslider device 30. This leaves a structure as shown inFIG. 4 . Theslider device 30 may then be moved from its position at first side edge 13 (FIG. 1 ) alongzipper closure 20 to second side edge 17 (FIG. 1 ); movement ofslider device 30 alongzipper closure 20 unmates first and second mating profiles 22, 24 (FIGS. 2 and 3 ) and provides access to interior 11 (FIG. 2 ). - Once the first and second mating profiles 20, 22 have been unmated, the user can grasp the profiles to tear the
frangible membrane 42 and gain access to thebag interior 11. As shown inFIG. 5 , a portion of thefrangible membrane 42 remains attached to each of the mating profiles 22, 24 after the bags have been initially opened. Theprofiles line 46, until theprofiles membrane 42. Once the membrane is broken, theslider 30 can be moved along thepackage 10 to provide access to theopen interior 11. - Referring now to
FIG. 7 a, thereshown is a sectional view of an alternate embodiment of thezipper closure 20 prior to the application of the zipper closure to the reclosable bag. Thezipper closure 20 includes thefirst profile 22, thesecond profile 24 and thefrangible membrane 42. Thefrangible membrane 42 has afirst end 46 that is sealed to the sealingflange 26 by a layer ofsealant material 50. Thefrangible membrane 42 further includes asecond end 48 that is sealed to the sealingflange 28 by another layer ofsealant material 50. In the preferred embodiment of the invention, thesealant material 50 is an LDPE copolymer where the EVA component exceeds 5%. Although this type of material is disclosed as being a preferred sealant material, it should be understood that various other sealant materials are contemplated as being within the scope of the present invention. - As with the previous embodiments, the
frangible member 42 is preferably formed from a material different from than the material used to form the mating profiles 22, 24 such that thefrangible membrane 42 has a lower strength than the mating profiles 22, 24. Thefrangible membrane 42 is preferably co-extruded with theprofiles FIG. 7 a. It is contemplated that thefrangible membrane 42 can alternatively be formed from a material having the same strength as the material used to form the mating profiles 22, 24. In such a case, the frangible membrane includes a line of weakness that allows the frangible membrane to rupture along the line of weakness during the initial opening of the zipper closure. - As shown in
FIG. 7 a, anon-sealing layer 52 is applied to the interior of thefirst end 46 andsecond end 48 of thefrangible membrane 42. Referring toFIG. 7 b, thenon-sealing material 52 provides the significant advantage when the sealingflanges zipper closure 20 are sealed toside panels flanges frangible membrane 42. Although the preferred embodiment of the non-sealing material is disclosed as being HDPE, it is contemplated by the inventors that the non-sealing material could be formed from other materials while operating within the scope of the present invention. - When heat and pressure is applied by the sealing
jaws 56 in a direction shown byarrows 54, thenon-sealing material 52 prevents thefirst end 46 andsecond end 48 of thefrangible membrane 42 from sealing together. In this manner, thefrangible membrane 42 may be applied topackages 10 according to techniques for manufacture that are generally well known in the art of packaging. - According to the embodiment shown in
FIGS. 7 a and 7 b, thezipper closure 20 may comprise one or more layers of sealingmaterials 50, as well as one or more layers ofnon-sealing materials 52. - The above specification is believed to provide a complete description of the manufacture and use of particular embodiments of the invention. Many embodiments of the invention can be made without departing from the spirit and scope of the invention.
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/843,235 US20050063617A1 (en) | 2003-09-15 | 2004-05-10 | Reclosable bag having tamper-evident membrane |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US50299403P | 2003-09-15 | 2003-09-15 | |
US10/843,235 US20050063617A1 (en) | 2003-09-15 | 2004-05-10 | Reclosable bag having tamper-evident membrane |
Publications (1)
Publication Number | Publication Date |
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US20050063617A1 true US20050063617A1 (en) | 2005-03-24 |
Family
ID=34316540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/843,235 Abandoned US20050063617A1 (en) | 2003-09-15 | 2004-05-10 | Reclosable bag having tamper-evident membrane |
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US (1) | US20050063617A1 (en) |
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US20060131328A1 (en) * | 2004-12-22 | 2006-06-22 | Brent Anderson | One way valve and container |
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US20080037913A1 (en) * | 2006-08-08 | 2008-02-14 | Martuch Thomas J | Flexible container for pourable product |
US20080240623A1 (en) * | 2007-03-30 | 2008-10-02 | Kapak Corporation | Bag construction with side gussets |
WO2009132199A1 (en) * | 2008-04-23 | 2009-10-29 | Pactiv Corporation | Package closure for withstanding internal forces |
WO2010096568A2 (en) * | 2009-02-19 | 2010-08-26 | Andrew Barker | Closure device |
US20110002558A1 (en) * | 2009-07-02 | 2011-01-06 | Sargin Gary F | Hooded bag with reclosable top |
US20110249919A1 (en) * | 2010-04-12 | 2011-10-13 | Velcro Industries B.V., Curacao | Reclosable pouch closures and related packaging and methods |
US20110315751A1 (en) * | 2010-06-24 | 2011-12-29 | Norio Goto | Tetrahedral shape packaging container and a tetrahedral shape packaging container method |
US20120099805A1 (en) * | 2010-10-20 | 2012-04-26 | Henri Bois | Closure device and sack employing it |
AU2015202504B2 (en) * | 2008-04-23 | 2017-02-23 | Pactiv Corporation | Package closure for withstanding internal forces |
US20170210511A1 (en) * | 2014-07-10 | 2017-07-27 | Ashok Chaturvedi | Peelable tamper evident diaphragm and package made thereof |
US20170225790A1 (en) * | 2016-02-05 | 2017-08-10 | Acro Aircraft Seating Limited | Life vest pouch |
US11572219B2 (en) | 2019-02-08 | 2023-02-07 | Elplast Europe Sp. Z O.O. | Zipper closure and package using the same |
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Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
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US20060131339A1 (en) * | 2004-12-22 | 2006-06-22 | Brent Anderson | One way valve for fluid evacuation from a container |
US20080230429A1 (en) * | 2004-12-22 | 2008-09-25 | Brent Anderson | One way valve for fluid evacuation from a container |
US20060131328A1 (en) * | 2004-12-22 | 2006-06-22 | Brent Anderson | One way valve and container |
US7972064B2 (en) | 2004-12-22 | 2011-07-05 | Cti Industries Corporation | One way valve and container |
US7967510B2 (en) | 2006-08-08 | 2011-06-28 | Kellogg Company | Flexible container for pourable product |
US20080037913A1 (en) * | 2006-08-08 | 2008-02-14 | Martuch Thomas J | Flexible container for pourable product |
US20080037912A1 (en) * | 2006-08-08 | 2008-02-14 | Martuch Thomas J | Flexible container for pourable product |
US8408793B2 (en) | 2006-08-08 | 2013-04-02 | Kellogg Company | Flexible container for pourable product |
US20080240623A1 (en) * | 2007-03-30 | 2008-10-02 | Kapak Corporation | Bag construction with side gussets |
US8944684B2 (en) * | 2007-03-30 | 2015-02-03 | Ampac Holdings Llc | Bag construction with side gussets |
WO2009132199A1 (en) * | 2008-04-23 | 2009-10-29 | Pactiv Corporation | Package closure for withstanding internal forces |
US11220374B2 (en) | 2008-04-23 | 2022-01-11 | Reynolds Presto Products Inc. | Package closure for withstanding internal forces |
AU2009240577B2 (en) * | 2008-04-23 | 2015-02-12 | Reynolds Presto Products Inc. | Package closure for withstanding internal forces |
AU2015202504B2 (en) * | 2008-04-23 | 2017-02-23 | Pactiv Corporation | Package closure for withstanding internal forces |
WO2010096568A3 (en) * | 2009-02-19 | 2011-01-13 | Andrew Barker | Closure device |
US20100236027A1 (en) * | 2009-02-19 | 2010-09-23 | Andrew Barker | Closure device |
WO2010096568A2 (en) * | 2009-02-19 | 2010-08-26 | Andrew Barker | Closure device |
US20110002558A1 (en) * | 2009-07-02 | 2011-01-06 | Sargin Gary F | Hooded bag with reclosable top |
US20110249919A1 (en) * | 2010-04-12 | 2011-10-13 | Velcro Industries B.V., Curacao | Reclosable pouch closures and related packaging and methods |
US8858077B2 (en) * | 2010-04-12 | 2014-10-14 | Velcro Industries B.V. | Reclosable pouch closures and related packaging and methods |
US20110315751A1 (en) * | 2010-06-24 | 2011-12-29 | Norio Goto | Tetrahedral shape packaging container and a tetrahedral shape packaging container method |
US8939643B2 (en) * | 2010-06-24 | 2015-01-27 | Norio Goto | Tetrahedral shape packaging container and a tetrahedral shape packaging container method |
US20120099805A1 (en) * | 2010-10-20 | 2012-04-26 | Henri Bois | Closure device and sack employing it |
US10633148B2 (en) * | 2014-07-10 | 2020-04-28 | Ashok Chaturvedi | Peelable tamper evident diaphragm and package made thereof |
US20170210511A1 (en) * | 2014-07-10 | 2017-07-27 | Ashok Chaturvedi | Peelable tamper evident diaphragm and package made thereof |
US20170225790A1 (en) * | 2016-02-05 | 2017-08-10 | Acro Aircraft Seating Limited | Life vest pouch |
US11572219B2 (en) | 2019-02-08 | 2023-02-07 | Elplast Europe Sp. Z O.O. | Zipper closure and package using the same |
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