Method for the preparation of a crystalline thermoplastic resin

Details Method for the preparation of a crystalline thermoplastic resin Method for the preparation of a crystalline thermoplastic resin

1985-07-19

1987-07-14

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264557, 264562, 2642103, 264235, 425 71, B29C 4788

Patent

active

046801570

ABSTRACT:
The invention provides a method for the preparation of a sheet of a crystalline thermoplastic resin, e.g. polypropylene, having excellent transparency and surface properties as well as thermoformability. The inventive method comprises quenching of a molten resin sheet extruded out of a T-die by introducing the same into a slit where cooling water is flowing at a velocity higher than the running velocity of the extruded molten resin sheet and then stretching the thus quenched resin sheet in a stretch ratio in the range from 1.02 to 1.5 times.

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