Method of and apparatus for producing a product with a coating l

Details Method of and apparatus for producing a product with a coating l Method of and apparatus for producing a product with a coating l

1990-12-06

1992-12-29

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating radioactive material

264255, 2643287, 425149, 425150, 425157, 425543, B29C 4514

Patent

active

051749335

ABSTRACT:
A cavity pressure is sequentially changed, by relatively displacing two mold dies forming a mold cavity, to a molding presure at which a product is molded in the mold cavity, a coating pressure lower than the molding pressure at which fluidized thermosetting plastic material is injected to form a coating layer, a curing pressure between the coating pressure and molding pressure at which the coating layer is cured, and a finishing pressure between the coating pressure and curing pressure at which the coating layer thermosets. The changing of the cavity pressure to the coating pressure is initiated a predetermined time later than a termination of a drop in pressure from the molding pressure due to shrinkage of the product. The changing of the cavity pressure to the curing pressure is initiated at a peak of an increase in relative displacement between the two mold dies caused by injecting a fluidized thermosetting plastic material in the mold cavity.

REFERENCES:
patent: 4076780 (1978-02-01), Ditto
patent: 4076788 (1978-02-01), Ditto
patent: 4082486 (1978-04-01), Cerano et al.
patent: 4235833 (1980-11-01), Arnason et al.
patent: 4668460 (1987-05-01), Ongena
patent: 4808361 (1989-02-01), Castro et al.
patent: 4917840 (1990-04-01), Harada et al.
patent: 4923383 (1990-05-01), Kurmaji et al.
patent: 5071603 (1991-12-01), Kurumaji et al.

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