Method of stretching film below the natural draw ratio without n

Details Method of stretching film below the natural draw ratio without n Method of stretching film below the natural draw ratio without n

1974-07-24

1976-11-30

White, Robert F.

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, B29D 724

Patent

active

039950077

ABSTRACT:
A method for producing a synthetic crystalline thermoplastic resin film suitable for stretching without necking including adding 5 to 300 parts by weight of a filler to 100 parts of a synthetic crystalline thermoplastic resin film such as polyethylene on isotactic polypropylene having a degree of crystallization of more than 60%, pressing the film against a rigid blade having a radius of curvature of 0.01 to 1.0 millimeter, bending the film around the blade using the blade as a fulcrum to a bending angle between 20.degree. and 170.degree., moving the film relative to the blade while keeping the bending angle constant thereby whitening the film, said whitening of the film being conducted without positively heating or stretching the film, and stretching the film after whitening at a draw ratio below the natural draw ratio of the film.

REFERENCES:
patent: 3007204 (1961-11-01), Veiel et al.
patent: 3201506 (1965-08-01), Bills
patent: 3231557 (1966-01-01), Bauer
patent: 3345447 (1967-10-01), Grant

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