Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1979-05-02
1981-03-03
Hess, Bruce H.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
156229, 15624411, 15624424, 264177R, 264514, 425 46S, 428515, B28B 2152, B29F 300, B32B 702, B32B 3130
Patent
active
042541751
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.
Berggren Kenneth S.
Kubat Josef
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