Apparatus for the preparation of foamed thermoplastic extruded p

Details Apparatus for the preparation of foamed thermoplastic extruded p Apparatus for the preparation of foamed thermoplastic extruded p

1974-10-31

1976-05-04

Annear, R. Spencer

Plastic article or earthenware shaping or treating: apparatus

With upstream screen or perforated plate for straining,...

264 459, 264176R, 425376, 425817C, B29D 702

Patent

active

039543650

ABSTRACT:
An apparatus for the production of extruded profiles of foamed thermoplasts consisting of an extruder having an extrusion screw or helix and a form-giving extruder head having a flow channel there-through, at least part of the length of said flow channel being divided by separating walls having a thickness of 0.2 to 3 mm arranged in the axial direction into individual channels of such a length and cross-section area whereby each individual channel has a nozzle coefficient k of from 0.1 to 2mm.sup.3, characterized in that thorn-like pins are inserted into some of the individual channels; as well as the process of extrusion.

REFERENCES:
patent: 1159489 (1915-11-01), Gammel
patent: 1397571 (1921-11-01), Bowen
patent: 3079634 (1953-03-01), Berger
patent: 3413387 (1968-11-01), Ohsol
patent: 3427371 (1969-02-01), Skinner
patent: 3447203 (1969-06-01), Campbell

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