Envelopes – wrappers – and paperboard boxes – Wrapper – For food
Patent
1995-10-17
1997-09-30
Garbe, Stephen P.
Envelopes, wrappers, and paperboard boxes
Wrapper
For food
229 8718, 383 98, B65D 7514, B65D 7526
Patent
active
056718829
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns a wrapper, that is, fold-over or envelope-type packaging, wherein piece goods, optionally sub-divisible, are wrapped in an external covering composed of a flat and flexible wrapper material, mutually overlapping edge zones of the wrapper material being bonded together by sealing or gluing.
STATE OF THE ART
A known fold-over wrapper of this kind is used in wrapping chocolate candy and comprises a two-layer envelope composed of two superposed blank-segments, the blank-segment to be located on the outside of the envelope consisting of a decoratively printed foil of two-dimensionally stretched polypropylene (OPP) and the blank-segment to be located on the side of the package facing the article consisting of a compound which on the decoration-side comprises an aluminum foil enameled with a background color and which on the side facing the packaged article is bonded to a layer of paper. The printed OPP foil and the compound foil each are pulled off as strips from rollers at the packaging machine, then both blank-segments are severed to size, whereupon the chocolate-candy envelope is made by said two blank-segments being superposed with a projecting edge of the OPP foil blank-segment, and finally a hot sealing tool is briefly pressed against the two mutually overlapping envelope flaps so that the projecting edge of the OPP foil at the uppermost envelope flap is connected to the outermost layer of the OPP foil of the envelope flap below.
This known fold-over packaging for chocolate candy however is complex in design and operation: two strips of packaging material must be fed to the packaging machine, said strips being independently cut to the right blank-segment lengths and necessitating specified superposition in order to provide the envelope material into which the packaged good are folded-over.
In order to remedy the above drawback, the fold-over packaging for chocolate candy described in the European patent application 480,907 proposes a single-layer packaging material requiring special handling which in an advantageous embodiment is composed of an aluminum/paper composite.
In many instances however a plastic foil is desired for the upper layer of the packaging material. As a rule however this requires multi-layer packaging materials and the bonding of the mutually overlapping edge zones of the packaging material, using a sealing procedure in which the packaged goods must withstand the force applied by a sealing tool, is difficult, if not impossible.
DESCRIPTION OF THE INVENTION
The invention solves the problem of creating a fold-over, i.e. envelope-type packaging or wrapper in which even multi-layer packaging materials can be bonded together by gluing or sealing at mutually overlapping edge zones.
This problem is solved in the wrapper of the invention by a wrapper material which is composed of two different layers of material with the layer facing the piece goods comprising in the uppermost edge zone of the wrapper material one or more cut-outs within which the two edge zones of the wrapper material are interconnected. The layer not provided with cut-outs advantageously is hot-sealing, per se, or is fitted at the lower side, at least at the sites of the cut-outs, with a heat-sealable layer preferably also simultaneously bonding the two different layers of material.
In an advantageous embodiment of the invention, the heat-sealable layer is composed of a hot-sealing wax.
In another advantageous embodiment of the fold-over wrapper of the invention, the layer of material not provided with cut-outs is fitted at its lower side with a permanent-adhesive coating which simultaneously may advantageously bond the two different layers material together.
In another advantageous embodiment of the fold-over wrapper of the invention, that layer of material not provided with cut-outs substantially consists of a plastic foil which, optionally, is transparent.
In a further embodiment of the invention, the layer of material fitted with cut-outs is a composite comprising a decorative
REFERENCES:
patent: 2286307 (1942-06-01), Replogie
patent: 2550520 (1951-11-01), Bennett
patent: 4881646 (1989-11-01), Weber
Cerwinski Herbert
Niederer Andreas
Garbe Stephen P.
Teich Aktiengesellschaft
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