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 1148316
ABSTRACT An improved molding apparatus for injection-compression molding thermo- setting materials is described. The apparatus comprises a stationary platen assembly, a moveable platen assembly and a feed nozzle assembly. The stationaryassembly is comprised of a stationary platen member, a heated plate, and a plurality of mold faces mounted on the heat plate. The moveable assembly is comprised of a moveable platen member, a heated plate mounted thereon and a plurality of mold faces. The feed nozzle assembly is comprised of a cylin- drical nozzle member, having an internal temperature controlling means, and a plurality of feed outlets positioned on the periphery. The temperature maintained in the nozzle member is sufficiently high to maintain the thermo- setting molding material in a plasticized state and sufficiently low that no substantial curing or setting-up of the thermosetting molding material takes place. In the injection stage, the moveable assembly is positioned to bring the mold faces on the moveable assembly into close proximity with the corresponding and aligned mold faces on the stationary assembly to form partially open mold cavities. The thermosetting molding material in a plasticized state is then fed through the nozzle member, through runner channels, into the partially open, heated, mold cavities. The heated mold cavities are then closed completely. The thermosetting material within the confines of the mold faces is thus pressed and heated to a temperature suffic- iently high to cure the material. After curing, the moveable assembly is retracted enabling the removal of the molded article and providing access to the mold face and surrounding area.
342259
Bainbridge Robert W.
Dannels W. Andrew
Occidental Chemical Corporation
Sherman
LandOfFree
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