Method and apparatus for injection molding plastic articles havi

Details Method and apparatus for injection molding plastic articles havi Method and apparatus for injection molding plastic articles havi

1983-01-03

1984-09-25

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 455, 264 54, 264DIG5, 264DIG83, 425559, 425562, 425817R, 521 85, B29D 2700

Patent

active

044735162

ABSTRACT:
Method and apparatus for injection molding plastic articles having solid exterior surfaces and porous interior cores wherein a molten mixture of a chemically reactive foaming agent and a thermoplastic resin is injected into a mold so as to fill the mold cavity with unfoamed resin and form an outer solid skin on the molded article. Immediately prior to injection, an activator additive is introduced into the mixture, the additive reacting chemically with the foaming agent after a time delay of no more than a few seconds to provide for cellular expansion within the core of the molded article. The result is a molded body with a solid unfoamed skin which accurately relicates the surface of the mold and a cellular inner core.

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