Method of extruding thermoplastic sheets

Details Method of extruding thermoplastic sheets Method of extruding thermoplastic sheets

1976-07-09

1978-09-05

Woo, Jay H.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

264177R, 428409, 428424, 428437, B28B 2154

Patent

active

041121660

ABSTRACT:
The present invention relates to an improvement in a die for extruding thermoplastic sheet having a controlled degree of microsurface roughness. The improvement comprises having a beveled leading edge on at least one of the die lips wherein the bevel is away from the die orifice in order to control the degree of microsurface roughness in the extruded sheet.

REFERENCES:
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patent: 2489951 (1949-11-01), Bump
patent: 2582294 (1952-01-01), Stober
patent: 3056163 (1962-10-01), Deis
patent: 3512215 (1970-05-01), Hutcheon
patent: 3558420 (1971-01-01), Opfell
patent: 3605649 (1971-07-01), Bundus
patent: 3635631 (1972-01-01), Fields
patent: 3700521 (1972-10-01), Gaffney
patent: 3825391 (1974-07-01), Davis
patent: 3867493 (1975-02-01), Seki
patent: 4038008 (1977-07-01), Larsen

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