System for recovering film from pressurized extrusion zone

Details System for recovering film from pressurized extrusion zone System for recovering film from pressurized extrusion zone

1981-10-20

1983-06-07

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Including means advancing continuous length work through...

425224, B29C 2500

Patent

active

043868975

ABSTRACT:
Continuous film production from a high pressure feed stream is achieved in a system which provides methods and means for maintaining pressurized gas in an extrusion zone wherein the extrudate may be cooled to form a solid polymeric film. The product film is withdrawn from the extrusion zone continuously through a standing liquid column in fluid communication with the extrusion zone. The film is passed downwardly into a liquid leg below the extrusion zone and upwardly through the liquid column, which has an upper exit end elevated above the pressurized zone thereby exerting super-atmospheric pressure. The product is recovered from the liquid sealing medium, advantageously water, at ambient pressure. Hot aqueous solutions of polyacrylonitrile may be extruded at elevated pressure onto a cooled casting drum in a gaseous environment wherein flashing of the hot solvent is prevented.

REFERENCES:
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patent: 3842151 (1974-10-01), Stoy et al.
patent: 3890074 (1975-06-01), Fritsch
patent: 4234431 (1980-11-01), Mishiro et al.
patent: 4301112 (1981-11-01), Zuick

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