Method of drawing film

Details Method of drawing film Method of drawing film

1989-07-21

1990-08-28

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

26 71, B29C 5506

Patent

active

049523635

ABSTRACT:
In a method of drawing a film which comprises drawing the traveling film in the longitudinal direction between rolls and thereafter cooling the drawn film by a cooling roll, the improvement which comprises engaging both side ends or their vicinities of the film with the engaging portions formed on both ends or their vicinities of the cooling roll in the circumferential direction. In the film drawing method of the invention, the drawn film is contacted in a softening state with the cooling roll, and pressed on the surface of the cooling roll by the tension of the film. Thus, both sides of the film are deformed according to the shape of the engaging portions during cooling, and prevent the contraction of the film in the cross direction by the engagement.

REFERENCES:
patent: 3261903 (1966-07-01), Carr
patent: 4384392 (1983-05-01), Allen

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