Side-folded bag or sack

Details Side-folded bag or sack Side-folded bag or sack

1998-08-27

2001-01-23

Garbe, Stephen P. (Department: 3727)

Flexible bags

Bag closure secured by a releasable or frangible bond

Adhesive bond

C229S214000, C383S906000

Reexamination Certificate

active

06176615

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a side-folded bag or sack of a flexible material, which is to be filled with a pourable material.
Known side-folded bags or sacks of this type consist of paper, plastic sheets or multilayer or composite materials, which may comprise plastic films or sheets, metal foil and paper layers and, after being filled with the pourable, for example grainy, material in an optionally separate filling process, are closed off on the inside at their head end in seam fashion with one another or with the in each case adjoining half of the side fold. The formation of this connecting or closing seam at the head end takes place preferably with the help of a hot-melt or hot-scaling adhesive, which is applied with the help of the bag producer along the upper edge of the head end on the inside of the bag and activated by heat to form a sealed closing seam. However, if the inside of the bag itself has to a sufficient degree the properties of a hot-melt adhesive for forming the sealed closing seam, the application of such a hot-melt adhesive can be omitted and the sealed closing seam can be produced directly at the upper edge of the bag with the help of conventional sealing jaws.
The handle at the upper edge of the bag, which is assigned to the inner folded edge of one of the two side folds, makes it easier in the case of such bags or sacks to pull out the side fold, the connecting seam between front and rear walls of the bag and the side fold half, which in each case adjoins, being undone in order to form a discharging opening for pouring material from the bag. If, as is the case particularly with larger bags or sacks, the contents of the bag are not to be removed in a single process and, instead, only partial amounts are to be removed in several pouring processes, which are more or less spaced apart in time, it is desirable, for the protection of the material remaining in the bag, to close once again the discharging opening, formed by opening the side fold. For this purpose, it is generally not sufficient to push the side fold back into the position, which it had assumed originally in the closed head end of the bag, since the elasticity of the usual bag material permits the side fold to spring open once again more or less and thus create an opening to the interior of the bag, which prevents effective protection of the contents of the bag.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a side-folded bag or sack of the type indicated above, which permits the discharging opening to be closed once again reliably with simple means after material has been removed from the bag.
Due to the two triangular corner tips, which are formed pursuant to the invention on either side of the inner folding edge of the side fold used to form the discharging opening from the front and rear walls of the bag together with the in each case adjoining half of the side fold, a simple closing once again of the discharging opening is possible owing to the fact that the two corner tips, after the side fold, which has previously been pulled open, is pushed back into its original position, are folded over along their diagonal folding lines towards the outside onto the front and rear wall of the bag and detachably fixed to these. The detachable fixing can be accomplished in a simple manner with the help of suitable adhesive means, for example, in the form of applications of a permanent or pressure sensitive adhesive or sections of a tape made of hooks and loops such as that sold under the trademark VELCRO, which preferably are disposed in an appropriate format at specified points on the front and rear walls of the bag on either side of the diagonal fold line of the corner tips, for example, in the region of the triangular points of the corner tips and the congruent triangles of the front and rear walls of the bags, folded over and covered by these triangular points. By folding over the corner tips onto the front and rear walls of the bag, the adhesive means can be caused to coincide without additional measures and thus attain by simple finger pressure a mutual bonding engagement, which prevents an unintentional rupturing of the side fold. On the other hand, such an adhesive engagement can easily be undone simply by pulling on the corner tips, when an opening for pouring out the contents is to be formed once again.
The invention is described in greater detail in the following by means of the drawing in which two embodiments of the object of the invention are illustrated diagrammatically.


REFERENCES:
patent: 3642189 (1972-02-01), Widenback
patent: 5392589 (1995-02-01), Buchanan
patent: 5547284 (1996-08-01), Imer
patent: 5882117 (1999-03-01), Laffon

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