Extruded rigid thermoplastic sheet having optically smooth surfa

Details Extruded rigid thermoplastic sheet having optically smooth surfa Extruded rigid thermoplastic sheet having optically smooth surfa

1979-01-10

1981-01-27

Herbert, Jr., Thomas J.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264284, 428410, D01D 516

Patent

active

042475074

ABSTRACT:
An extruded rigid thermoplastic sheet having optically smooth surfaces, characterized as exhibiting a degree of optical distortion (.delta.) of from 0.03 to 0.06, is produced by a process wherein a sheet-form extrudate from an extruder is polished by polishing rolls driven via a continuous driving force transmission.

REFERENCES:
patent: 3937863 (1976-02-01), Moore
Breuer, Plastverarbeiter, No. 3, pp. 113-122, Jan. 1978.
ASTM, D-648, Standard Method of Test for Deflection Temperature of Plastics Under Load, pp. 202-204, Reapproved 1961.

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