Method of forming a blocked cross-plied polymer film

Details Method of forming a blocked cross-plied polymer film Method of forming a blocked cross-plied polymer film

1983-03-11

1985-01-29

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624414, 15624427, B29D 2304

Patent

active

044964137

ABSTRACT:
A method is disclosed for forming a blocked cross-plied polymer film by extruding a polymer melt through a tubular rotary die to impart a molecular orientation of the polymer in the transverse (TD) direction during extrusion, expanding the film, and then blocking it by pressing opposing walls together to produce a film in which at lease two layers thereof have transverse molecular orientations which cross to form a balanced cross-plied film.

REFERENCES:
patent: 3051989 (1962-09-01), Mercer
patent: 3853661 (1974-12-01), Sudo
patent: 3862878 (1975-01-01), Azuma
patent: 4011128 (1977-03-01), Suzuki
patent: 4358330 (1982-11-01), Aronovici

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