Bag

Abstract

A collapsible bag is provided for receiving and discharging fluids, pastes, or gases, and contains at least one composite film with a rough internal layer. The bag due to the roughened internal layer is specifically configured such that the inner walls of the bag will not stick to each other.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority, under 35 U.S.C. §119, of German application DE 10 2011 101 177.7, filed May 11, 2011; the prior application is herewith incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a bag which is intended to receive and discharge matter. In particular, the invention relates to collapsible, flexible bags which are suitable for receiving, in general terms, matter.[0004]In the present invention, a bag means, in general terms, a hollow, deformable item which is suitable for receiving and discharging matter. A bag can have one or more apertures through which material can be charged thereto and emptied therefrom, and these apertures can be capable of closure, for example by faucets, spouts or hose connections. Removal can also be achieved here through attached hoses. However, a bag does not have to possess apertures, an example being vacuu...

AI Technical Summary

Benefits of technology

[0010]Bags of this type are usually those manufactured from plastics films or from pieces of plastics films. When the pieces of plastics films, or the plastics films, are mutually superposed, they exhibit a tendency to adhere to one another. There is therefore a tendency toward adhesion of the interior smooth film surfaces, and conventional lubricants and/or anti-blocking agents cannot inhibit this tendency. The tendency toward adhesion of the internal areas of the bag composed of film material is therefore undesirable, because a consequence of the adhesion can be formation, within the bag, of vesicles which inhibit complete emptying of the bag during discharge of its contents. Specifically when the bag contents are of very high value, complete emptying of the bag during discharge is desirable and essential. The vesicles formed by this type of adhesion equally make it difficult to achieve adequate evacuation of bags after contents have been charged thereto.

[0011]The prior art discloses bags which are composed of film material and in which an internal area of the film material has been provided with an embossment or with profiling. A disadvantage here is that the embossment or the profiling weakens the cross section of the material of the film web, with possible impairment of its strength. Furthermore, very complicated manufacturing technology is required to introduce the embossment into the film material.

[0012]On the basis of the disadvantages, the invention is based on the object of designing a bag in such a way that the adhesion between the internal areas is suppressed.

[0013]In an advantageous embodiment, the bag is composed of two films or film sections, namely a region of a film with at least one rough internal side and of a congruent, opposite region, which can be composed of a smooth film which is easy to produce or of a smooth film region

Problems solved by technology

There is therefore a tendency toward adhesion of the interior smooth film surfaces, and conventional lubricants and / or anti-blocking agents cannot inhibit this tendency.

The tendency toward adhesion of the internal areas of the bag composed of film material is therefore undesirable, because a consequence of the adhesion can be formation, within the bag, of vesicles which inhibit complete emptying of the bag during discharge of its contents.

The vesicles formed by this type of adhesion equally make it difficult to achieve adequate evacuation of bags after contents have been charged thereto.

A disadvantage here is that the embossment or the profiling weakens the cross section of the material of the film web, with possible impairment of its strength.

Furthermore, very complicated manufacturing technology is required to introduce the embossment into the film material.

Images