Method of hot-press molding polyparaphenyleneterephthalamide fil

Details Method of hot-press molding polyparaphenyleneterephthalamide fil Method of hot-press molding polyparaphenyleneterephthalamide fil

1996-03-05

1998-11-17

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

264294, 264320, 26433112, 264343, 264345, B29C 4304

Patent

active

058371761

ABSTRACT:
A film molding method and apparatus capable of shortening a mold cycle time and obtaining a molded product of an excellent quality. A method of hot-press molding a polyparaphenyleneterephthalamide (PPTA) film into a predetermined shape includes a first step of evaporating water from a PPTA film containing water at least 50% or more as a swelling agent, and obtaining an amorphous film having a density less than a predetermined density and a modulus in tension of about 70%; and a second process of hot-press molding the film for a predetermined time period by metal molds heated up to at least 330.degree. C. to crystallize the film to have a predetermined density specific to a PPTA film and produce an intrinsic physical value, and obtaining a molded product of the film. A film molding apparatus for performing the film molding method includes holes or slits opening at the surface of each of the metal molds, and an air suction unit and an air exhaust unit provided for each of the metal molds.

REFERENCES:
patent: 3966686 (1976-06-01), Asakura et al.
patent: 4752643 (1988-06-01), Imanishi et al.
patent: 5283027 (1994-02-01), Sakamoto et al.
Patent Abstracts of Japan, Polyamide Film and Preparation Thereof, Apr. 14, 1988 Group No. M685, vol. 12, No. 120 Abstract of Japanese Application 61-88322.
Jastrzebeski, The Nature and Properties of Engineering Materials, 2d Ed., pp. 230-231, 1976.
Brady et al., Materials Handbook, 12th Ed., pp. 934-935, 1986.

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