Pressure reaction injection molding process and apparatus...

Details Pressure reaction injection molding process and apparatus... Pressure reaction injection molding process and apparatus...

B - Operations, Transporting

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B29C 45/73 (2006.01) B29C 33/04 (2006.01) B29C 37/00 (2006.01) B29C 67/24 (2006.01)

Patent

CA 1261578

ABSTRACT OF THE DISCLOSURE 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, pre- ferably 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 centi- grades.

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