The present invention relates to a resealable closure for packages storing articles and, more particularly, resealable closures for packages having a package integrity indicator.
Some containers for food products, such as cookies and other snacks, typically include an outer wrapper. In one type of container, the wrapper surrounds a frame which acts as a tray to hold the food product and to protect the food product from damage. Other food products come packaged in plastic trays, such as thermoform trays which are sealed on the top using some type of lidding material. One recent advancement in the art of food container closures includes a resealable closure disclosed in U.S. Pat. No. 6,918,532(hereinafter “the '532 patent”), herein incorporated by reference, which discloses a wrapper which forms a top of the container, which has an access opening covered by a resealable sealing panel.
In the packaging art, different methods have been used to indicate whether a package has been previously opened or whether the integrity of the package has been compromised, which is often referred to in the art as “tamper-evident.” For example, in the tissue wipes packaging art of U.S. Pat. No. 6,428,867 (hereinafter “the '867 patent”), a means for indicating package integrity includes a tamper-evident tab with one or more ink layers which is initially an integral part of a sealing panel prior to the package being opened for a first time. The tab is transferred with one of the ink layers from the sealing panel to the top of the package when the closure has been opened for a first time. Tamper-evidence is indicated in a misalignment of the sealing panel with an image on the transferred tab, which is visible through a transparent outer layer of the sealing panel, after the sealing panel has been resealed to the top of the package.
There is a need for improvement in the art for package integrity indicators for a resealable closure, preferably suitable for use with a resealable closure for containers or packages containing food items.
The present invention generally relates to a resealable closure for a container formed from a two-ply material, which has a package integrity indicator in the form of a coating of material, such as ink or paint, which transfers between a sealing panel and a film layer disposed therebelow when the container has been opened for a first time.
The present invention, in one form, comprises a package integrity closure comprising a film layer forming a top of a container and having a flap defining an access opening to gain access to the contents of the container. A sealing panel completely covers the flap of the film layer. A releasable adhesive is provided on either or both the sealing panel or the film layer for adhering the sealing panel to the film layer. The sealing panel is releasable from the film layer by pulling the sealing panel back in a peeling direction and reclosable against the top to seal the access opening when the sealing panel is moved back against the top. A coating of transferable material is disposed on either the film layer adjacent the access opening on a surface facing the sealing panel or on the sealing panel on a surface facing the film layer. The coating is transferable from either the film layer or sealing panel to the sealing panel or the film layer, respectively. The coating transfer occurs without a transfer of a portion of the film layer or sealing panel bonded to the coating when the sealing panel is pulled back from the film layer for a first time to thereby provide a visual indication that the closure has been previously opened. The sealing panel can either be a top layer of a multilayer material forming the top of the container, such as the container disclosed in U.S. patent application Ser. No. 11/500,497, herein incorporated by reference, or a discrete label applied over a film layer forming the top of the container, such as the container of the '532 patent. Further, the perimeter edge of the sealing panel can be either linear or nonlinear such as a zigzag pattern.
Advantageously, the coating of transferable material is a different color or pattern than that of the film layer or sealing panel. If the coating is initially applied to the sealing panel, evidence that the closure has been previously opened is observable in the form of a partial outline of the coating transferred to the film layer adjacent the sealing panel, which is visible due to a slight misalignment of the sealing panel with the film layer when the sealing panel is reapplied to the top of the container upon closure. If the perimeter edge of the sealing panel is nonlinear, such as a zigzag pattern, a slight misalignment of the zigzag pattern between the sealing panel and the film layer will be visible as a slightly misaligned pattern.
A secondary evidence of package integrity is provided in the form of a reduction in peel force between the sealing panel and the film layer after the closure has been previously opened and subsequently resealed due to a deadening effect resulting from the transfer of the coating from the sealing panel or film layer to the adhesive on the opposite surface or the transfer of adhesive with coating material from either the film layer or sealing panel to the opposite surface.
The present invention, in another form thereof, concerns a package integrity indicating closure comprising an at least two-ply material comprising a first film layer adhesively joined to a second film layer. A first tear line is formed in the first film layer defining a first panel for providing an access opening through the first film layer when separated from the first film layer along the first tear line. A second film layer having a second layer tear line defines a sealing panel which completely covers the first panel. The sealing panel is releasably adhered to the first film layer, such that the sealing panel is separable from the first film layer to expose the access opening. A coating of transferable material is on either the sealing panel on a surface facing the first film layer or on the first film layer facing the sealing panel so that upon opening the closure, a portion of the coating is transferred from between the second film layer and the first film layer to provide a visual indication that the closure has been opened after the sealing panel has been peeled back from the first film layer for a first time.
The present invention, in another form thereof, concerns a package integrity indicating closure for a container comprising an at least two-ply material comprising an inner layer adhesively joined to an outer layer and forming a top of the container. The inner layer has an inner layer panel and the outer layer has a sealing panel formed therein, which completely covers the inner layer panel. The first panel and the sealing panel are permanently joined to each other to provide an access opening into the container. A releasable adhesive is provided on one or both the sealing panel and the inner layer for adhering the sealing panel to the inner layer. The sealing panel is releasable from the inner layer by pulling the sealing panel back in a peeling direction and reclosable against the top to seal the opening when the sealing panel is moved back against the top. A coating of transferable material is on either the sealing panel or on the inner layer facing the sealing panel so that upon opening the closure, a portion of the coating is transferred from between the sealing panel and the inner film layer to provide a visual indication that the closure has been opened after the sealing panel has been peeled back from the inner layer for a first time.
The present invention, in another form thereof, relates to a package integrity indicating food container comprising a tray and an at least two-ply material comprising an inner layer adhesively joined to an outer layer to form a top over the tray. The top is formed to provide an access opening for access to the food items disposed in the tray. The inner layer has a first panel and the outer layer has a sealing panel formed therein, which completely covers the first panel. The first panel and sealing panel are permanently joined to each other to form the access opening into the container. A coating of transferable material is on either the outer layer adjacent the access opening on a surface facing the inner layer or the inner layer facing the sealing panel. A releasable adhesive is provided on either or both the inner layer on a perimeter outside the first panel or the sealing panel, which lies thereover for adhering the sealing panel to the inner layer. The sealing panel is releasable from the inner layer by pulling the sealing panel layer back in a peeling direction and reclosable against the top to seal the opening when the sealing panel is moved back against the top whereby, upon opening the closure for a first time, a portion of the coating is transferred from between the outer layer and the inner layer to provide a visual indication that the closure has been opened.
Food items disposed in the container may include cookies, crackers, peanuts, cheese, sliced meats and semi-solid foods.
Other features and advantages of the present invention are stated in or apparent from detailed descriptions of the presently preferred embodiments of the invention found herebelow.
Referring to the figures and, in particular,
Advantageously, the inner film layer 12 is coextensively formed and adhesively joined to the outer film layer 13. During the manufacturing of package 10, the inner film layer 12 is die cut along first tear line 20 and the outer film layer 13 is die cut along a second tear line 21, as disclosed in U.S. Patent Application Publication No. 2005/0276525, herein incorporated by reference.
The first tear line 20 is formed as a continuous tear line to define a panel 22. The panel 22 is separated from the remainder of the inner film layer 12 to expose an opening 24 (
The second tear line 21 defines sealing panel 26 of the outer film layer 13. The sealing panel 26 extends beyond the periphery of the first tear line 20, adjacent to the opening 24, so that the sealing panel 26 completely covers and extends beyond the perimeters of the panel 22.
The side of the sealing panel 26 which faces the inner film layer 12 is coated with a releasable adhesive 27 (see
A coating of transferable material 28, such as ink or paint, is disposed or otherwise printed on a perimeter edge 34 of the sealing panel 26 on top of the adhesive 27. Coating 28 is any appropriate transferable paint or ink known in the packaging art including but not limited to those disclosed in U.S. Patent Application Publication No. 2006/0257599, herein incorporated by reference.
Alternatively, coating 28 can be applied directly to the sealing panel 26 rather than on top of adhesive 27. Adhesive 27 can either be applied to the sealing panel adjacent the coating only or on top of the coating as well.
Adhesive 29 is applied along the inner film layer 12 approximate the second tear line 21. Adhesive 29 can be any known adhesive in the art which, advantageously, has a bond strength between the adhesive 29 and the coating 28 which is greater than the bond between the coating 28 and the sealing panel 26 and the bond between coating 28 and adhesive 27. When the closure 11 is opened for a first time, a portion of the coating 28 will be transferred from the sealing panel 26 to the adhesive 29 covered portion of the inner film layer 12, as will be discussed in greater detail below.
In an alternative embodiment, there is no adhesive 29 applied along the inner film layer 12. Instead, coating 28 forms a sufficiently strong bond with the inner film layer 12 such that upon opening closure 11 for a first time, some or all of the coating 28 will be transferred from the sealing panel 26 to the inner film layer 12.
As shown in
In addition, when the sealing panel 26 is peeled away from the inner film layer 12 to separate the panel 22 for a first time, a portion of the coating 28, namely transferred coating 28a, is separated from the sealing panel 26 and remains or adheres to the adhesive 29 disposed on the inner film layer 12. Advantageously, the color of the coating 28 is different than the color of the top surface of the package 10. Although a residual amount of coating 28 is depicted, alternatively, all of coating 28 can be transferred from the sealing panel 26 to the inner film layer 12.
Referring specifically to
In addition to the visual indication, package integrity is further evident after the package has been previously opened and resealed due to a deadening effect of adhesive 29 due to the transfer of the coating 28 thereto. As a result, the transferred coating 28a deadens the adhesive 29 along the portions where the coating 28a has been transferred. Consequently, a previously opened package, having a deadened portion of the adhesive 29, is easier to open a second and subsequent time than it is initially.
An alternative embodiment to package 10 is depicted in
Referring now to
Referring now specifically to
When the sealing panel 226 is pulled back for a first time, some or all of the coating 228, for example, transferred coating portion 228a, will be transferred from the film layer 212 to the releasable adhesive 227, thus deadening those portions of the adhesive 227 now covered with transferred coating 228a, as shown in
An additional alternative embodiment of a package with a package integrity feature, in accordance with the present invention, is provided in
When the package 310 is opened for a first time, a portion of the adhesive 327 bonded to the coating 328 will be transferred from the sealing label 325 to the film layer 312 to form transferred coating 328a to the top of the package 310. (See
While
Referring to
As with package 10, package 410 has a coating of transferable material 428 deposited on the perimeter 434 of the sealing label 426 and adhesive 427 formed around the perimeter of the inner film layer 412 adjacent the second tear line 421, which lies directly underneath the coating 428 when the sealing panel is laid flat on the top 414 of the package 410. Like package 10, peeling back the sealing panel 426 for a first time transfers a portion of the coating 428 to adhesive 429. When the sealing panel 426 is returned to its flat position, a portion of the transferred coating 428a will be visible when viewing the top of the package 410, due to a slight misalignment of the sealing panel 426 with the inner layer 412, in a similar manner as with package 10.
Although package 410 is described as having closure 411, package 410 can incorporate any of the closures 11, 111, 211 and 311. It will now be evident to one of ordinary skill in the art that the present resealable package with package integrity features provides advantages not found in prior packages.
Although the invention has been described above in relation to preferred embodiments thereof, it will be understood by those skilled in the art that variations and modifications can be effected in these preferred embodiments without departing from the scope and spirit of the invention.
This application is a continuation of prior application Ser. No. 11/616,386, filed Dec. 27, 2006, which issued as U.S. Pat. No. 8,114,451 on Feb. 14, 2014.
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1318081 | Jun 2003 | EP |
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2693988 | Jan 1994 | FR |
2766794 | Feb 1999 | FR |
2783512 | Mar 2000 | FR |
2171077 | Aug 1986 | GB |
2266513 | Nov 1993 | GB |
2276095 | Sep 1994 | GB |
57-163658 | Oct 1982 | JP |
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62-171479 | Oct 1987 | JP |
63-022370 | Jan 1988 | JP |
0581083 | Nov 1993 | JP |
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H10-152179 | Sep 1998 | JP |
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0140073 | Jun 2001 | WO |
02064365 | Aug 2002 | WO |
02066341 | Aug 2002 | WO |
03013976 | Feb 2003 | WO |
03037727 | May 2003 | WO |
03035504 | May 2003 | WO |
03059776 | Jul 2003 | WO |
2004087527 | Oct 2004 | WO |
2005056420 | Jun 2005 | WO |
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2005110042 | Nov 2005 | WO |
2005110865 | Nov 2005 | WO |
2005110876 | Nov 2005 | WO |
2005110885 | Nov 2005 | WO |
2005120989 | Dec 2005 | WO |
2005123535 | Dec 2005 | WO |
2006055128 | May 2006 | WO |
2006080405 | Aug 2006 | WO |
2006108614 | Oct 2006 | WO |
2007090419 | Aug 2007 | WO |
2008051813 | May 2008 | WO |
2008062159 | May 2008 | WO |
2008074060 | Jun 2008 | WO |
2008108969 | Sep 2008 | WO |
2008115693 | Sep 2008 | WO |
2008122961 | Oct 2008 | WO |
2008146142 | Dec 2008 | WO |
2009065120 | May 2009 | WO |
2009111153 | Sep 2009 | WO |
2010002834 | Jan 2010 | WO |
2010046623 | Apr 2010 | WO |
2010051146 | May 2010 | WO |
2010080810 | Jul 2010 | WO |
2010084336 | Jul 2010 | WO |
2010088492 | Aug 2010 | WO |
2010114879 | Oct 2010 | WO |
2010149996 | Dec 2010 | WO |
2011004156 | Jan 2011 | WO |
2011121337 | Oct 2011 | WO |
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2011146627 | Nov 2011 | WO |
2011146658 | Nov 2011 | WO |
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Number | Date | Country | |
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20120125932 A1 | May 2012 | US |
Number | Date | Country | |
---|---|---|---|
Parent | 11616386 | Dec 2006 | US |
Child | 13348536 | US |