Heat cycle injection compression molding method

Details Heat cycle injection compression molding method Heat cycle injection compression molding method

1982-07-15

1984-04-10

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432816, B29F 106

Patent

active

044420617

ABSTRACT:
A heat cycle injection compression molding method comprises several steps: heating a synthetic resin until it becomes fluidized; injecting the fluidized synthetic resin into a large and nonuniform cavity formed by a cavity block and a mold which is slightly opened; cooling the injected fluidized resin until the center portion temperature of the resin is equal to or lower than a solidifying temperature of the resin, thereby solidifying the resin; reheating the solidified resin uniformly until the temperature of the resin is higher than the solidifying temperature, thereby making the resin fluidized again; compressing the refluidized resin by reducing the volume of the cavities; cooling the refluidized resin until the temperature of the refluidized resin is lower than a take-out set temperature, while continuing the compressing step, thereby resolidifying the resin; stopping the compressing step; and ejecting out of the mold a formed product having a large and nonuniform thickness.

REFERENCES:
patent: 3632729 (1972-01-01), Bielfeldt
patent: 4094952 (1978-06-01), Frank
patent: 4290744 (1981-09-01), Dannels
patent: 4309379 (1982-01-01), Dannels
patent: 4364878 (1982-12-01), Lalibute
patent: 4370122 (1983-01-01), Dannels
patent: 4370123 (1983-01-01), Dannels

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