Pack for packaging a material in the form of pieces

Special receptacle or package – Laminate sheet packet – With gas permeable cover

Patent

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Details

383 84, 383 86, 383 88, 383 99, B65D 7300

Patent

active

048260118

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL DOMAIN

The invention relates to a pack, essentially impermeable to air, for packaging a material in the form of pieces or one that is divisible or divided into pieces, with an envelope formed of a flat, foldable material, having two edge regions of the packaging material joined together by means of a detachable seal at the inside of the packaging material within a sealing region, particularly one in the form of a strip. The packs according to the invention shall preferably, but not exclusively, be executed as tubular bag packs. The two edge regions of the packaging material joined together by such a detachable seal then form the longitudinal sealing seam, called pane, of the tubular bag pack.


STATE OF THE ART

A tubular bag pack of this type, serving particularly for packaging chocolade bars, is known from the German [Unexamined] Patent Application DE-OS 24 58 462. Here, the longitudinal sealing seam is located particularly along a dividing notch of the chocolate bar, namely at the rear side of the envelope that is away from the notch. To open the pack, the chocolate bar is broken off along this dividing notch in such a manner that the longitudinal sealing seam comes to lie along the outer side of the break. The two edge regions of the packaging material that are joined together in the longitudinal sealing seam are stripped apart by the separation of the sealing joint during the progressive breaking of the pack, starting from the inside of the pack, to finally creating an opening in the envelope.
The pack described in the aforementioned application has been used extensively as a chocolate wrapper during the past few years. However, in order to ensure a clean break of the material to be packaged, it is necessary that the longitudinal sealing seam is in practice always situated along a dividing notch or spot. This constitutes a not inconsiderable limitation of the possibilities for arranging the longitudinal sealing seam.


DESCRIPTION OF THE INVENTION

It is the object of the invention to create a pack of the aforementioned type in which the sealing seam, in which the two edge regions of the packaging material are joined together, can be arranged without regard to the position of a dividing notch or spot of the product to be packaged, and that can be opened without breaking off the packaged product, in a simple manner and, if need be, also with one hand.
The underlying problem of the invention is solved by the pack according to the invention, which is characterized by that the edge regions of the packaging material joined together by a seal in a strip-shaped sealing region are folded back onto the outer surface of the envelope, whereby the outside of the edge region adjoining the outer surface of the envelope is joined by bonding to the outer surface of the envelope over at least a part of its surface, and that the strip-shaped sealing region does not extend to the edge of the packaging material, at least at the edge region not bonded to the outer surface of the envelope. Said bonding to the outer surface of the envelope is advantageously carried through by a hotmelt adhesive.
According to an advantageous embodiment of the invention, the pack according to the invention is a tubular bag pack, in which the edge regions of the packaging material joined together by a seal and folded back onto the outer surface of the envelope form the longitudinal sealing seam of the tubular bag, and in which the outer surface of the edge region folded back and adjoining the outer surface of the envelope is joined by bonding to the envelope surface only at or in the region of the cross seal(s) of the tubular bag pack.
According to a further embodiment of the pack according to the invention, the latter is a tubular bag pack with longitudinal and cross sealing seams produced by cold sealing.
In another advantageous embodiment of the pack according to the invention, the latter is characterized by that in the edge region not bonded with the envelope surface, the packaging material forms a fold between the strip-shaped

REFERENCES:
patent: 3570751 (1971-03-01), Trewella

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