Apparatus for making thermoplastic articles with porous cores an

Details Apparatus for making thermoplastic articles with porous cores an Apparatus for making thermoplastic articles with porous cores an

1975-07-25

1977-07-05

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

Molding of thermosetting or cross-linking stock

264DIG83, 425812, 425817R, 425569, B29D 2700

Patent

active

040337103

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 sprue 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: 3288903 (1966-11-01), Hendry
patent: 3479422 (1969-11-01), Zavasnik
patent: 3509596 (1970-05-01), Shaw et al.
patent: 3703345 (1972-11-01), Giesemann
patent: 3894823 (1975-07-01), Hanning

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