Envelopes – wrappers – and paperboard boxes – Paperboard box – With closure for an access opening
Patent
1996-11-05
1999-03-02
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
With closure for an access opening
22912509, 229204, 493 87, 493102, 493114, B65D 5122
Patent
active
058759590
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a cuboid flat gable package, in particular a tab package with central or corner seam, with the composite having at least one carrier layer made from paper or cardboard, a coupling layer, a barrier layer, preferably made from aluminium, and a double-sided plastic coating made from polyethylene (PE), with an opening area provided in the package gable which forms the pour opening after the severing, with a pouring element provided with a reclosable closing lid whose flange encompassing the opening area is rigidly connected to the package surface, with the closing lid simultaneously representing the opening means and with the opening area having a weakening to support the opening process, as well as a method to produce such a cuboid flat gable package.
Cuboid flat gable composite packages are known in numerous arrangements. They are used predominantly in the field of liquid packages in connection with cold, cold-sterile, hot and aseptic fillings. These packages can usually not be closed any more once they are opened. It has therefore already been proposed in connection with flat gable composite packages of the kind mentioned above to arrange a pouring element in the package gable which is equipped with a respective closing lid (DE 38 08 303 A2). A circular severing line to weaken the gable material is provided in the zone of the cardboard layer and the outer PE layer, into which a respective tubus, which is connected with the closing lid in one piece and corresponds to the shape of the circular severing line, is pressed into the package material in order to open the package. For the purpose of easier severing of the weakened severing line, the lower edge of the tube is provided with suitable mechanical opening means such as blades or the like.
The aforementioned flat gable composite package can be improved in respect of several items. It is clear that for the purpose of storage and transportation it must be ensured that the tube connected with the closing lid must not penetrate the material prematurely, i.e. prior to the first use of the package. For this purpose a strap is provided according to the current state of the art for this kind of inventions which fixes at a specific distance the closing lid and the flange of the pouring element which circles the severing line. Only after the removal of the strap is it possible to push the opening tubus into the package composite material by pressing in the closing lid. This leads to the consequence that a certain minimum height of the known pouring element is mandatorily required. This is a disadvantage owing to the stackability required for flat gable composite packages.
Other known flat gable packages (EP 0 238 947 B1) provide that the pour opening is opened up by pulling off a strap which covers the opening area. Although this leads to a particularly flat overall height, this proposed solution is not capable of ensuring the tight reclosability of the packages. Moreover, this solution requires the severing and immediate resealing of the liquid sealing layer and the barrier layer, which leads to risks concerning tightness and sterility.
Although the requirement concerning the reclosability and tightness is sufficiently met by the pouring elements applied on the package gable, the resultant which usually projects outwardly on the joint in lever mechanisms leads to tearing off the pour spout in the known embodiments owing to the weak layer adherence of the cardboard layer or the cardboard PE layers. Moreover, the tearing off of pouring elements frequently occurs during the transportation and stacking of such flat gable packages, particularly as a result of the overall height of the pouring element. Such a package is no longer usable and is no longer accepted by retailers and consumers.
Starting out from this, the present invention is based on the object of providing and further developing a cuboid flat gable composite package of the type mentioned above and a process for its production, so that a reliable connection of pouring element and pac
REFERENCES:
patent: 4852764 (1989-08-01), Store
patent: 4915290 (1990-04-01), Robichaud et al.
patent: 4930683 (1990-06-01), Farber
patent: 4944408 (1990-07-01), Rausing
patent: 5101999 (1992-04-01), Robichaud et al.
patent: 5364019 (1994-11-01), Bjorck et al.
Schmidt Holger
Weiteder Hans Josef
Elkins Gary E.
PKL Verpackungssysteme GmbH
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