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

1980-06-18

1982-04-27

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

264 11, 2642102, 264284, 350359, 351177, 428337, 428339, 428409, B32B 2716, B32B 2730, G02C 702, G02F 129

Patent

active

043271499

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.

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