Method of making thermoplastic articles with porous cores

Details Method of making thermoplastic articles with porous cores Method of making thermoplastic articles with porous cores

1976-05-17

1978-09-19

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 97, 264DIG1, 264DIG5, 264DIG83, B29D 2700

Patent

active

041154916

ABSTRACT:
Thermoplastic articles with highly porous cores and less porous or nonporous skins are injection-molded with the aid of a nozzle having a flow divider disposed upstream of its aprue for splitting the oncoming plastic mass into a homogeneous outer stream and an inner stream admixed with a foaming agent, the two streams merging inside the gate of a mold cavity. The foaming agent enters through a central channel which may be provided with one or more ducts alternately usable to introduce pressure fluid and coolant into the cavity lined with coalescing layers of nonfoamed and foamed plastic. The flow divider may be axially movable within the nozzle to serve as a control valve and flow regulator.

REFERENCES:
patent: 3558751 (1971-01-01), Santelli
patent: 3894823 (1975-07-01), Hanning
patent: 3901958 (1975-08-01), Doll
patent: 3956438 (1976-05-01), Schippers
patent: 3972970 (1976-08-01), Taylor

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