Producing thermoplastic articles particularly with porous walls

Details Producing thermoplastic articles particularly with porous walls Producing thermoplastic articles particularly with porous walls

1984-11-23

1985-11-19

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

425396, 425403, B29C 1700, B29D 2303

Patent

active

045539235

ABSTRACT:
An article is molded from a thermoplastic material matrix having a particulate filler distributed throughout the matrix. The article is then expanded to develop fissures between the thermoplastic matrix material and particles of the filler material and particles of the filler material, so as to render the article porous. Apparatus for expanding a pipe from the inside or expanding the sides of corrugations in a pipe are also disclosed.

REFERENCES:
patent: 2876824 (1959-03-01), West et al.
patent: 3857666 (1974-12-01), Barnett
patent: 3932093 (1976-01-01), Maier
patent: 3966384 (1976-06-01), Maier
patent: 3998579 (1976-12-01), Nordstrom
patent: 4077758 (1978-03-01), de Putter
patent: 4136143 (1979-01-01), Lupke et al.
patent: 4510013 (1985-04-01), Lupke et al.

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