| 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. |