B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/710
B29C 45/56 (2006.01) B29C 45/27 (2006.01)
Patent
CA 1181211
APPARATUS FOR RUNNERLESS INJECTION - COMPRESSION MOLDING OF THERMOSETTING MATERIALS ABSTRACT The apparatus of the present invention includes a stationary assembly and a movable assembly. The station- ary assembly is comprised of a stationary platen which has a heat plate, a temperature-controlled sprue bushing and a mold face positioned thereon. The movable assembly is comprised of a movable platen which has a heat plate mounted thereon and a mold face, corresponding to, and adapted to be aligned with, the mold face on the sta- tionary assembly to form a partially open mold cavity. Means are provided to feed a supply of thermosetting molding material through the sprue bushing into the partially open mold cavity. Means are provided to com- pletely close the mold cavity and place the apparatus in a compression stage. In the injection and in the compression stages, the discharge end of the sprue bushing is in direct feed relationship with the mold cavity, allowing flow of molding material from the sprue bushing into the mold cavity in the injection stage and flow of molding material from the mold cavity into the sprue bushing in the compression stage. Means are also provided for the subsequent retraction of the movable assembly to allow removal of a molded article and access to the mold area.
400169
Bainbridge Robert W.
Dannels W. Andrew
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Occidental Chemical Corporation
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