Process for producing thermoplastic polymer sheets

Details Process for producing thermoplastic polymer sheets Process for producing thermoplastic polymer sheets

1977-07-06

1979-04-10

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264130, 264213, 264216, B06B 300, B29D 702

Patent

active

041488512

ABSTRACT:
A process for producing a thermoplastic polymer sheet, especially that of polyethylene terephthalate, which comprises extruding a molten thermoplastic polymer through an extrusion die in the form of a polymer sheet onto the surface of a moving cooling body and supplying a liquid, such as water or an alcohol, in an amount sufficient to adhere the polymer sheet to the surface of the cooling body, as a vapor or fine liquid droplets to the surface of the extruded polymer sheet at a position between the extrusion die and the surface of the cooling body. This ensures good adhesion between the molten polymer in sheet form and the surface of the cooling body, and provides polymer sheets having superior surface properties at higher speeds than in the prior art.

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patent: 3976733 (1976-08-01), Havens
patent: 4017575 (1977-04-01), Heyer
patent: 4069282 (1978-01-01), Gutermuth et al.

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