Method and apparatus for heating a mold cavity

Details Method and apparatus for heating a mold cavity Method and apparatus for heating a mold cavity

B - Operations, Transporting

29

C

18/660

B29C 45/17 (2006.01) B29C 44/34 (2006.01)

Patent

CA 1176418

ABSTRACT This apparatus is used to improve the heat distribution on the cavity surface in foam molding dies where a smooth finish on the resin filled foam molded plastic product manufactured by an injection molding process is desired. This invention improves the method for heating the mold cavity using a condensing vapor in a molding die by a channel and slit type orifice means in the mold around a portion of the periphery of the part to be molded. Another channel and slit type orifice means around the remaining periphery is included in the die for removing the condensing vapor or condensate from the mold cavity. During the heating process when condensing vapor is introduced into the mold the spruce opening to the extruder is sealed by a valve means to prevent condensate from collecting therein.

398846

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