B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 7/01 (2006.01) B29C 35/16 (2006.01) B29C 43/24 (2006.01) B29C 47/00 (2006.01) B29C 47/88 (2006.01) B29C 59/04 (2006.01) B29C 69/02 (2006.01)
Patent
CA 2044117
An extruded, smooth finished solid sheet or film of thickness < 1 mm is prepared from a thermoplastic plastic having a glass transition temperature > 50°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 surfaces of the strip; and cooling said extruded strip below the glass transition temperature.
Dickhaut Gunther
Fetzer Andreas
Gross Heinz
Evonik Roehm Gmbh
Fetherstonhaugh & Co.
Rohm G.m.b.h. Chemische Fabrik
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