Method and apparatus for producing synthetic plastics products,

Details Method and apparatus for producing synthetic plastics products, Method and apparatus for producing synthetic plastics products,

1978-03-07

1980-02-05

Anderson, Philip

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 453, 264 50, 264 54, 264176R, 264323, 264328, 264DIG69, 264DIG83, 425 4R, 425576, 425817R, 521 81, 521134, 521143, B29D 2700

Patent

active

041873521

ABSTRACT:
A process for working up thermoplastic synthetic resin material, in particular unsorted thermoplastic synthetic resin waste material into an article having the working and processing properties of wood, and in which the material is subjected to a mixing operation in a housing including a screw member, and is fluidized, moulded, cooled in the mould, and removed from the mould. According to the invention, the synthetic resin material is supplied to an extruder without a screen member and without an extrusion nozzle, and kept therein until there is obtained a material that is fluid owing to temperature increase, and which material contains a gas when it leaves the extruder. The material is then passed into a mould having open ends, one of which is connected to the outlet of the extruder.

REFERENCES:
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patent: 2026439 (1935-12-01), Sanial
patent: 2375955 (1945-05-01), Smith
patent: 2665648 (1954-01-01), Vogt
patent: 2923034 (1960-02-01), Dickie et al.
patent: 3342913 (1967-09-01), Engel
patent: 3425092 (1969-02-01), Taga
patent: 3479429 (1969-11-01), Morshauser et al.
patent: 3500541 (1970-03-01), Hammerlund et al.
patent: 3774811 (1973-11-01), Staerman
Collins, F. H., "Controlled Density Polystyrene Foam Extrusion", in SPE Journal, Jul. 1960, pp. 705-709.

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