Method for making biaxially stretched articles of thermoplastic

Details Method for making biaxially stretched articles of thermoplastic Method for making biaxially stretched articles of thermoplastic

1978-02-13

1980-11-25

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

264130, 2642103, 2642107, 264280, 264291, B29C 1702, B29D 724

Patent

active

042358345

ABSTRACT:
A method is disclosed for biaxially stretching a band of thermoplastic resin which comprises attenuating a band of unstretched resin, in a forming zone while the resin is in the thermoelastic condition, by passing the band between two surfaces spaced at a distance less than the thickness of said band of unstretched resin while permitting said band to expand in width, and then cooling said band to a temperature below the softening point of the resin while maintaining the dimensions of the attenuated and expanded band; apparatus for performing such a method is also disclosed.

REFERENCES:
patent: 2618012 (1952-11-01), Milne
patent: 3083410 (1963-04-01), McGlamery
patent: 3290420 (1966-12-01), Orser
patent: 3370111 (1968-02-01), Boone
patent: 3504075 (1970-03-01), Williams, Jr. et al.
patent: 3852387 (1974-12-01), Bortnick et al.
patent: 4085187 (1978-04-01), Jenks et al.

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