Method of injection-molding and cooling of shaped synthetic-resi

Details Method of injection-molding and cooling of shaped synthetic-resi Method of injection-molding and cooling of shaped synthetic-resi

1978-04-05

1979-08-14

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264455, 264237, 264328, 264335, 264DIG14, 264DIG83, B29C 2500

Patent

active

041645235

ABSTRACT:
Shaped synthetic-resin bodies are made in a separable mold by injecting a flowable mass of a synthetic-resin material into the mold cavity. To precool the mass and cause an initial setting at least of the surface thereof, a liquefied gas, i.e. a low-boiling liquid which is in a gaseous state at room temperature and atmospheric pressure, is introduced between the mass and the walls of the cavity. The coolant is discharged from the cavity through at least one controllable cross-section outlet to regulate the contact time between the coolant and the mass. The initially set precooled body is ejected from the mold and is subjected to final cooling and temperature homogenization (tempering), e.g. in a liquid bath.

REFERENCES:
patent: 2689376 (1954-09-01), Wacker
patent: 3299192 (1967-01-01), Lux
patent: 3482281 (1969-12-01), Thiel

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