Apparatus for forming plastic

Details Apparatus for forming plastic Apparatus for forming plastic

1978-03-16

1980-07-01

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264255, 264328, 264DIG83, 425130, 425573, 425817R, B29D 2700, B29F 110

Patent

active

042106168

ABSTRACT:
A method for injection molding a product having a non-cellular skin layer and a cellular core portion. The method involves successive or simultaneous injection of a non-foamable resin material and a foamable resin material through a sprue bushing having an injection channel connected to the mold cavity and a pair of fixed feed channels intersecting with the injection channel. The injection mold has a bore with a sprue bushing therein. The sprue bushing having an injection channel therein and intersecting with a pair of fixed feed channels. Injection units deliver the materials to the pair of fixed feed channels.

REFERENCES:
patent: 2226408 (1940-12-01), Nast
patent: 2279380 (1942-04-01), Reid
patent: 3061879 (1962-11-01), Montpeat
patent: 3809519 (1974-05-01), Garner
patent: 3945535 (1976-03-01), Leiste et al.
patent: 3945784 (1976-03-01), Collins
patent: 3947175 (1976-03-01), Melcher
patent: 3947177 (1976-03-01), Eckardt
patent: 3972664 (1976-08-01), Fillmann
patent: 4014966 (1977-03-01), Hanning
patent: 4078875 (1978-03-01), Eckardt

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