Composite packaging material and process for making same
OwnerRoland K. Belzinventor
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Abstract
The invention relates to a composite foil, particularly a toilet seat support in which at least one thin, outer normally water-insoluble sealing layer (3) is connected to a less thin water-soluble supporting layer (2) optionally by means of one or more intermediate layers. For obtaining a complete tightness at least the sealing layer (3) is constructed in non-porous manner by extruding a foil from a thermoplastic material. Furthermore, the invention relates to a process and apparatus for the production of the foil by extrusion, preferably with a co-extrusion die.
Claims32
In a packaging material having at least one outer, normally water-insoluble sealing layer and at least one soluble layer connected to said water insoluble layer, said soluble layer containing a solubilizer for said water-insoluble sealing layer, the improvement wherein:
- said water-insoluble sealing layer comprises an extruded non-porous layer of a thermoplastic material which is soluble in a non-neutral medium;
- said soluble layer comprises an extruded layer of a thermoplastic material;
- and,
- said solubilizer is present in an amount sufficient for solubilizing said water insoluble layer and said water soluble layer when the latter is also formed by extrusion of a water insoluble thermoplastic material.
A process for the continuous production of a multi-layered, non-porous packaging material having a substantially water-insoluble waterproof layer on one side and a soluble layer from the other side, said the soluble layer containing a solubilizer for said water-insoluble layer, said process comprising:
- extruding said layers from thermoplastic material;
- interconnecting said layers to each other;
- and,
- said water-insoluble layer being soluble in a non-neutral medium, and said soluble layer comprising a solublizer in an amount sufficient for solubilizing a corresponding portion of said water-insoluble layer.
Dependencies are inferred from the claim text.