Method for the extrusion of thermoplastic material composites

Details Method for the extrusion of thermoplastic material composites Method for the extrusion of thermoplastic material composites

1980-04-28

1981-11-24

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 50, 264 53, 264171, 264174, 264211, 425 4C, 425113, 425817C, B29D 2700

Patent

active

043024092

ABSTRACT:
Method for dispersing a fluid additive within only a portion of a stream of thermoplastic material comprising the steps of
(a) flowing said stream of thermoplastic material into a channel having walls of substantially circular cross section, into which there has been placed a rotating mixer head having in the surface thereof a plurality of alternate lands and grooves each of said lands and grooves having an upstream end and a downstream end, said lands alternating with said grooves and being arranged in pairs, each of said pairs having a land in loose clearance with said wall followed by a land in close clearance with said wall, said mixer head having an unobstructed internal passage positioned therein over a substantial portion of its terminal length and a plurality of conduits severally connecting elongated zones between said lands pairs and said hollow internal passage, and
(b) injecting said fluid additive into said channel at a position between said upstream and downstream ends of said lands and grooves.

REFERENCES:
patent: 2848739 (1958-08-01), Henning
patent: 3484507 (1969-12-01), Smith
patent: 3711067 (1973-01-01), Kovacs
patent: 4033710 (1977-07-01), Hanning
patent: 4134687 (1979-01-01), Eckardt
patent: 4222729 (1980-09-01), Ragazzini et al.

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