Method and apparatus for heating a mold cavity uniformly

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making

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Details

26437816, 264DIG14, 264DIG83, 425144, 425547, 425812, 425817R, B29D 2700, B29F 100

Patent

active

043904866

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 sprue opening to the extruder is sealed by a valve means to prevent condensate from collecting therein.

REFERENCES:
patent: 4133858 (1979-01-01), Hayakawa et al.
patent: 4164523 (1979-08-01), Hanning
patent: 4201742 (1980-05-01), Hendry

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