Envelopes – wrappers – and paperboard boxes – Paperboard box – Including tearing or breaking means for opening a nonunitary...
Patent
1994-01-11
1995-02-14
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Including tearing or breaking means for opening a nonunitary...
2291232, 22912535, B65D 134
Patent
active
053887573
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a packing of the widely known type used as a sales packing for certain foodstuffs, notably small piles of meat slices, and comprising a cup shaped lower part made by die-shaping of a plastic sheet, and upper closing means fastened to a projecting top edge flange of the lower part. Normally, the closing means are formed by a piece of a tight sheet welded to the said edge flange, and an upper reclosing lid, which is also die-shaped from a plastic sheet material, viz. so as to have depending edge portions, which can be releasably held by engagement with the outer edge of the edge flange. Normally, the tight cover sheet carries a paper label, which, in addition to a standard print, may be provided with a price and date marking. The reclosing lid is transparent.
The cover sheet as forming the real barrier closure of the cup part is removable by tearing, normally in being peel welded to the edge flange, and the associated upper lid is usable solely for reclosing the packing once the cover sheet has been entirely or partly torn off in connection with the first opening of the package.
There are some problems connected with these packings, particularly with respect to the reclosing lid. These lids are difficult to mount properly, both at the original closing of the packing and by later, manual reclosings. It is not unusual to find packings without lids in the shop cold counters, just as loose, torn off lids may be found. The lids are produced by thermoshaping of a relatively thick sheet material, and difficulties have been encountered as to the choice of materials that are well suited for use and also suitable as far as treatment of household waste is concerned. Thereby the lids tend to be relatively expensive.
It can be a further drawback that the printed information indicating the kind of the packed product and e.g. its keeping date will normally be removed by the tearing off of the cover sheet.
It is the purpose of the invention to provide a packing of the relevant type which will be usable in an acceptable manner without being having the discussed, particular reclosing lid.
The packing according to the invention is characteristic in being provided with two layers of cover sheets, viz. an inner cover sheet and and outer barrier sheet. The cover sheet is welded to the edge flange of the cup part, while the upper barrier sheet is secured to the same flange by a tight, but peelable welding, preferably in an indirect manner, by welding to the edge area of the cover sheet. The barrier sheet constitutes the long term sealed portion of the packing, and it is simply torn off when the packing is to be used. The label of paper or plastic sheet is still located on the inner cover sheet, but here it will remain in place, because only the barrier sheet is removed. The inner cover sheet is prepared such that shortly inside the inner mouth edge of the cup member it is provided with a cutting or perforation line extending along a suitable partial length of the circumference of the cup mouth, and the paper label is dimensioned and mounted such that it projects beyond this line, the label being removably held by means of a pressure sensitive adhesive.
Thereby it will be the inner sheet that will provide for the desired re-closability. The paper label may have a projecting tag that is not provided with adhesive or is otherwise easily seizable for an initial pulling up of the label; however, as also known from certain prior art packings that are closed in a similar manner, the result will be a pulling up not only of the label, but also of the underlying sheet portion inside the said cutting or perforation line, i.e. the packing will be opened. E.g. by a marking on the label it may be indicated that the pulling up should be effected only to a certain limit, e.g. until about half of the cup mouthing has been uncovered, as this may be sufficient for the removal of goods from the cup part. In return, a face-to-face engagement will be maintained between the label and a stationary part of the cover sheet;
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Elkins Gary E.
Schur International A/S
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