Method of injection molding polyethylene terephthalate

Details Method of injection molding polyethylene terephthalate Method of injection molding polyethylene terephthalate

1994-08-18

1996-07-09

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

26432814, 26432817, 425203, 425587, B29C 4563

Patent

active

055342043

ABSTRACT:
A method of injection molding polyethylene terephthalate without being predried or with having an irregular-shape wherein a vent type injection machine is employed and the vent is forcedly performed by vacuum suction within a range of a specified degree of vacuum, i.e. 50 to 150 torr (equal to 6666.1.about.19998.3 Pa.) and/or at the same time the material is forcedly fed by a feed screw having a specifically set revolution speed. According to the present invention, it is possible to provide an injection molding method in which an PET without being predried or with having an irregular-shape can be molded.

REFERENCES:
patent: 4181510 (1980-01-01), Sano et al.
patent: 4247519 (1981-01-01), Sano
patent: 4578455 (1986-03-01), Pipper et al.
patent: 4670203 (1987-06-01), Chang
patent: 5385462 (1995-01-01), Kodama et al.
Perry et al., Chemical Engineers' Handbook, 5th edition, 1973, pp. 11-5 thru 11-8, 11-17, 11-18, 11-25 and 11-26.

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