Plant for injection molding of thermosetting epoxy plastics

Details Plant for injection molding of thermosetting epoxy plastics Plant for injection molding of thermosetting epoxy plastics

1978-09-21

1981-03-17

Silbaugh, Jan H.

Plastic article or earthenware shaping or treating: apparatus

Including ventilating type hood or chamber encasing a...

264102, 425203, 425208, 425210, 425546, 425562, 425574, 425543, G29G 300

Patent

active

042564441

ABSTRACT:
This invention provides process and apparatus for the injection molding of epoxy resin molding compositions. The constituent materials of the epoxy resin feed mixture are separated into at least two groups in at least two separate chambers. Each of the chambers is subjected to a vacuum of from about 50 to 100 Torr in order to degassify the feed material and thereby avoid the formation of voids in the final molded product. The degassified molding materials are then fed under pressure to a mixing tube which may be heated. The mixing tube is connected by means of a valve having a discharge orifice alignable with the entry passage of a mold. The mixing tube, valve and orifice are movable toward the mold so that the orifice engages the mold and is maintained in engagement therewith at a greater pressure than the pressure exerted on the molding composition fed to the mixing tube and mold.

REFERENCES:
patent: 2862239 (1958-12-01), Pollard et al.
patent: 3154618 (1964-10-01), Baer et al.
patent: 3351983 (1967-11-01), Grigull
patent: 3561047 (1971-02-01), McInnis
patent: 3619447 (1971-11-01), Kerna et al.
patent: 3621892 (1971-11-01), Gillespie

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