Pressure reaction injection molding process for making molded bo

Details Pressure reaction injection molding process for making molded bo Pressure reaction injection molding process for making molded bo

1986-07-03

1988-11-15

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264327, 2643286, 2643288, 26432816, 26432818, 425555, B29C 4573

Patent

active

047848146

ABSTRACT:
Molded bodies of thermoset material are produced from monomers, oligomers or higher pre-polymers of reactive resins by pressure reaction injection molding. The molded bodies may contain filler and/or reinforcing material. The process is carried out in a mold consisting of a first, preferably upper half mold and a second, preferably lower half mold, and an inlet socket opening downwardly into the first half mold. The mold is equipped with heating coils adapted for applying separately a lower temperature to the first half mold and a higher temperature to the second one. During the introduction and hardening phase of the reactive mixture, the first half mold is maintained at a lower temperature than the second half mold, the temperature difference amounts to about 40 to 180, and preferably 60 to 120 centigrades.

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patent: 4338068 (1982-09-01), Suh et al.
patent: 4350739 (1982-09-01), Mohiuddin
patent: 4370122 (1983-04-01), Dannels et al.
patent: 4439386 (1984-03-01), Antczak
Research Disclosure 217, May 1982 #21716.
Modern Plastics International, 11, 58 (11/83).

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