Method of manufacturing thermoplastic sheet or film

Details Method of manufacturing thermoplastic sheet or film Method of manufacturing thermoplastic sheet or film

1991-06-10

1992-09-22

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264 406, 264 407, 264237, 264280, 2642105, 425327, 425377, 425373, B29C 4790

Patent

active

051494817

ABSTRACT:
An extruded, smooth finished solid sheet or film of thickness <1 mm is prepared from a thermoplastic plastic having a glass transition temperature >50.degree. C., by extruding the plastic in the thermoplastic state through a slot nozzle to form a flat extruded strip, which is introduced into the roll gap of a roll stack having a smoothed upper roll and a lower roll, with the upper roll being maintained at a temperature below the glass transition temperature of the thermoplastic plastic and with the lower roll being maintained at a temperature in the plastic state domain of the thermoplastic plastic, and, after exiting the roll gap, the extruded strip is moved resting on a smooth-finished endless belt which passes around the lower roll, thereby smoothing the surface of the strip; and cooling said extruded strip below the glass transition temperature.

REFERENCES:
patent: 2791801 (1957-05-01), Szantay
patent: 4734229 (1988-03-01), Johnson et al.
patent: 4826560 (1989-05-01), Held
patent: 4858139 (1989-08-01), Wirtz
patent: 4859392 (1989-08-01), Vetter
patent: 4874571 (1989-10-01), Muller

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