Process for the production of expanded synthetic material articl

Details Process for the production of expanded synthetic material articl Process for the production of expanded synthetic material articl

1982-08-09

1984-01-03

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264321, 264DIG4, 425 4R, B29D 2700

Patent

active

044241801

ABSTRACT:
According to the process, the shape of the mold cavity is at least partly modified at the point where it is desired to modify the physical characteristics of the molding during production. After the synthetic material is injected into the mold and hot expanded to fill the mold, the mold cavity is expanded at the point where the physical characteristics are to be modified and the molding is allowed to expand in a complementary manner in order that the material completely fills the expanded cavity. Then there is a compression of the molding and the molding is cooled to fix its shape.

REFERENCES:
patent: 3264381 (1966-08-01), Stevens

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