The present invention relates to a resealable closure for packages storing articles and, more particularly, such resealable closures 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 top has an access opening covered by a resealable sealing panel.
In the packaging art, different structures have been used to indicate whether a package has been previously opened or whether the integrity of the package has been compromised, which structures are often referred to in the art as “tamper-evident.” For example, one recent package integrity indicating closure is disclosed in U.S. patent application Ser. No. 11/500,497 hereinafter the '497 application and incorporated by reference, which shows a closure comprising a two-ply material having an inner film layer and an outer film layer forming a top of a container. The outer film layer has a sealing panel covering a portion of the inner film layer which, with the sealing panel, forms an opening. The package integrity feature comprises a panel of the inner film layer which separates from the sealing panel to indicate that the closure has been previously opened.
There is a need for improvement in the art of 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 in which package integrity is indicated by a structure which breaks and/or produces an audible sound when the resealable closure is opened for a first time.
The present invention, in one form, comprises a package integrity feature having a structure associated with a resealable closure. The structure preferably produces an audible sound when the resealable closure is opened for a first time. In one form, the structure comprises at least one strip initially affixed to a stationary and a movable portion of the resealable closure so that upon opening the resealable closure for a first time, at least one of the strips breaks, preferably producing the audible sound. The strips may include a weakened portion such as a narrowing at one location along its length. Integrity of the package is indicated by an intact strip viewable upon opening the resealable closure and conversely, a broken or non-intact strip would indicate that the resealable closure has been previously opened.
In a further form, package integrity is evidenced by a see-through window in the resealable closure so that a portion is visible therethrough prior to the closure being opened for a first time, but not visible therethrough after the closure has been opened for a first time and resealed. This portion may be one of the strips or it may be a second panel which is separate from the strips.
In another further form, the structure comprises at least two strips, wherein at least one strip will break at a different time than another one or more strips upon opening the resealable closure, thereby preferably producing at least two separate audible sounds as each strip breaks.
The package integrity feature may comprise a closure for a package having a top, an access opening in the top and a sealing panel which covers the access opening and sealingly engages the top around the access opening so as to originally seal the package and then, after having been opened a first time, be resealable against the top. A structure is associated with the resealable closure which preferably produces an audible sound when the resealable closure is opened for a first time. Advantageously, the structure produces an audible sound prior to being able to remove an item contained within the package.
The present invention, in another form, relates to a package integrity indicating closure comprising a film layer forming the top of a container and having a flap defining an access opening to gain access to the contents of the container and having at least one strip joining the flap to a remaining portion of the top. A sealing panel completely covers the flap including the at least one strip of the film layer. A releasable adhesive provided on either or both the sealing panel or on the film layer adheres 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 is reclosable against the top to seal the access opening when the sealing panel is moved back against the top. Upon peeling the sealing panel back for a first time, the at least one strip joining the flap to the top breaks.
The package integrity indicating closure may also comprise at least a two-ply material comprising an inner layer adhesively joined to an outer layer and, together, forming a top of the container. The inner layer has a first panel, a second panel, and at least one strip joining the first panel to a remaining portion of the top of the container. The outer layer has a sealing panel formed therein which completely covers the first panel, covers the strip and covers the second panel of the inner layer. The first panel and the sealing panel are permanently joined to each other to provide an access opening into the container. A releasable adhesive provided around a perimeter of the sealing panel adheres the sealing panel to the inner layer and the second panel. The sealing panel is releasable from the inner layer and is separable from the second panel 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. Upon opening the closure for a first time, the at least one strip between the first panel and the remaining portion of the top of the container breaks. After closing, the second panel is separated from the sealing panel. Advantageously, in one form, the at least one strip is integrally formed with the inner layer.
Package integrity may also be indicated by misalignment of sealing panel holes with tab portions after the sealing panel has been opened and resealed.
Food items disposed in the container may include but are not limited to 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.
a is the package of
b is the package of
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 the package 10, the first, inner film layer 12 is die cut on its side via first tear line 20, which includes all of the dashed lines in
The first tear line 20 is formed as a continuous tear line to define a first panel 22. The first tear line 20 also defines a plurality of strips 50, 52, 54. A second tear line 23 forms a second panel 42 which also serves to indicate package integrity.
The first panel 22 can be separated from the remainder of the inner film 12 to expose an opening 24 whereby access to the contents of the package may be gained after the strips 50, 52, 54 have broken (
Strip portions 50b, 52b, 54b are integrally joined to the first film layer flap 22 at strip ends 50d, 52d, 54d, respectively. Advantageously, die cut 20 forms the strip ends 50d, 52d, 54d in the shape of parallel “U”'s which help ensure that the strips 50, 52, 54 will not tear at strip ends 50d, 52d, 54d and will remain integrally joined to the first panel 22 and allow the strips 50, 52, 54 to break at the weakened narrowing strip portions 50c, 52c, 54c, respectively.
The second panel 42 remains integrally joined to the inner film layer 12 at end 44, even after the package is opened, and the remainder of the second panel 42 falls down into the opening 24 as described in more detail in the '497 application.
The third tear line 21 defines sealing panel 26 of the outer film layer 13 and the die cuts 25 define a plurality of tab portions 27 in the sealing panel 26. The sealing panel 26 extends beyond the periphery of the first tear line 20 and the second tear line 23 adjacent to the opening 24, so that the sealing panel 26 completely covers and extends beyond the perimeters of the first panel 22, strips 50, 52, 54, and the second panel 42. As a result, sealing panel 26 completely covers the first panel 22, the strips 50, 52, 54, and the second panel 42.
The side of the sealing panel 26 which faces the inner film layer 12, including tab portions 27, is coated with a releasable adhesive 28 (see
Alternatively or along with releasable adhesive 28, releasable adhesive can be coated on the inner film layer 12 along the outside perimeter of the first panel 22. The releasable adhesive can be any pressure sensitive adhesive which allows resealing and includes, but is not limited to, the adhesives disclosed in U.S. patent application Ser. No. 11/029,626, herein incorporated by reference. The sealing panel 26 is provided with a tab 30 or other gripping feature which is not coated with adhesive 28 so that the sealing panel 26 may be peeled back from the inner film layer 12 to open the package 10.
Advantageously, the sealing panel 26 has a see-through window portion 29 which lies over the second panel 42 of the inner film layer 12 prior to the package 10 being opened for a first time which permits one to visually observe the second panel 42 adhered thereto prior to the package 10 being opened for a first time and to observe the absence of the second panel 42 attached to the sealing panel 26 after the package 10 has been opened to indicate package integrity as described in the '497 application.
Referring now specifically to
Initially, upon opening the closure 11, the strip portions 50a, 52a, 54a separate from the sealing panel 26 while strip portions 50b, 52b, 54b remain attached to the sealing panel 26 as shown in
Pulling the sealing panel 26 further in direction of arrow 33 further opens the closure 11 and eventually strips 50 and 54 break at narrowing strip portion 50c, 54c, respectively. As each strip breaks an audible sound such as a snap occurs. Advantageously, the strip narrowing portion 50c, 54c are at the respective same position along the strip 50, 54 so that the strips 50 and 54 break at the same time, thereby producing a unified or single audible sound. Since strip 52 breaks prior to strips 50, 54, two audible sounds are produced, one upon strip 52 breaking, and a second one as strips 50 and 54 break simultaneously.
Package integrity is indicated by closure 11 through several novel features incorporated into the closure 11. Package integrity is indicated visually by one observing the intact integrally joined strips 50, 52, 54 which advantageously break upon opening the closure 11 a sufficient amount prior to allowing one to remove contents therein thereby indicating package integrity. Further, package integrity is indicated by audible sounds produced when the strips break, whereby the audible sound indicates that the package is being opened for a first time.
In addition, package integrity is indicated by the visual indication of a portion 34 of the sealing panel 26, shown as black outlined letters for the word “SEALED,” and a portion 36 of the inner film layer 12 spanning a portion of the panel 22, shown as being gray, which is viewable through the window portion 29 prior to the closure 11 being opened for a first time (
Further, since the sealing panel 26 does not generally return to its exact original position, but instead is slightly misaligned relative to its original position, package integrity is indicated by such misalignment of the sealing panel holes 32 with the tab portions 25 after the sealing panel 26 has been opened and resealed (
Referring to
Package 110 can be used for various food items, such as cheese, sliced meats and the like. In addition, package 110 can be used for semi-solid items, such as pudding and yogurt. Although package 110 is depicted as having a rectangular shape, the package 110 can have any shape, including cylindrical and irregular.
The inner and outer film layers 112, 113 may be formed of the same material as layers 12, 13, which includes polypropylene, polyethylene, cellophane or any other polymeric material suitable for forming a package enclosure.
Referring now to
Referring now specifically to
Referring now to
Tear lines 323a and 323b form a pair of integrity indicating panels 342a, 342b, respectively. When the package 310 is opened for a first time, the panels 342a, 342b remain integrally joined to the inner film layer 312 at end 344a, 344b, even after the package 310 is opened, and the remainder of the panels 342a, 342b fall down into the opening 324, as described in more detail in the '497 application.
Package 310 includes a sealing panel 326 with a pair of see-through window portions 329a, 329b which lie over panels 342a, 342b, respectively, of the inner film layer 312 prior to the package 310 being opened for a first time. The see-through windows 329a, 329b permit one to visually observe the panels 342a, 342b adhered thereto prior to the package 310 being opened for a first time and to observe the absence of the sealing panels 342a, 342b attached to the sealing panel 326 after the package 310 has been opened to indicate package integrity status.
Once package 310 has been opened and resealed, package integrity status is evidenced by the absence of the panels 342a, 342b attached to the sealing panel 326 in a similar manner as indicated for second panel 42 in package 10. In addition, like package 10, the integrity of package 310 is observable by a misalignment of the sealing panel holes 332 with the tab portion 325 after the sealing panel 326 has been opened and resealed (
The present invention specifically shows embodiments with three rows of food products (such as cookies) with three strips and with a single row of food products (such as cookies) and a single strip. It is to be understood that the invention is applicable to packages with any number of rows of food products, wherein the number of strips will be selected as desired, considering the number of rows of food products, the width of the package and the desired spacing of the strips. Also, different sized packages can employ any desired number of windows, whether such windows lie over second or third panels or over one or more strips. In addition, the food products can be arranged in rows across the package, or the food product may involve no rows at all, such as for peanuts. In any of these arrangements, the present invention can include any suitable number of strips and/or any suitable number of sealed windows.
As will be apparent to one of ordinary skill in the art that the present package integrity feature of the present closure offers benefits over prior tamper-evident or package integrity features.
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