Method of stretching polypropylene films

Details Method of stretching polypropylene films Method of stretching polypropylene films

1978-02-16

1979-01-16

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

264289, B29C 1702

Patent

active

041349571

ABSTRACT:
Biaxially oriented thermoplastic films, for example polypropylene films, are further stretched in one direction in a stretching zone having a distance in the direction of stretching which is greater than the breadth of said film. As a result, stretched films having a uniform thickness in the breadthwise direction are obtained in a high yield rate.

REFERENCES:
patent: 2547763 (1951-04-01), Land et al.
patent: 3177277 (1965-04-01), Adams et al.

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