Apparatus for the preparation of a multilayer film

Details Apparatus for the preparation of a multilayer film Apparatus for the preparation of a multilayer film

1977-09-06

1979-12-04

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With casting, plastic molding, or extruding means

156229, 15624414, 264515, 4251331, B30B 1122, B31B 3130, B29D 2304

Patent

active

041771036

ABSTRACT:
A continuous process for preparation of a multilayer film from thermoplastic material comprising processing in an extruder, feeding into a film blowing die having several concentric slots, stretching, blowing, bonding and winding up wherein the layers are bonded together when the exterior layer has been oriented to the desired extent in the longitudinal direction by stretching and the interior layer in the transverse direction by blowing by means of gas medium and, optionally, in the longitudinal direction by stretching, but before any of the material layers has been cooled to a temperature which corresponds to the frost point of the material in question and otherwise before any of the material has lost its viscous flowability, and wherein one or more interior layers may be used.
Furthermore, an apparatus for the performance of the above process is provided by means of which a double layer film is prepared.

REFERENCES:
patent: 2753596 (1956-07-01), Bailey
patent: 2957201 (1960-10-01), Fields et al.
patent: 3726743 (1973-04-01), Reifenhauser
patent: 3926706 (1975-12-01), Reifenhauser et al.

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