Apparatus for preparing polymer film

Details Apparatus for preparing polymer film Apparatus for preparing polymer film

1989-08-08

1991-01-22

Thurlow, Jeffery

Plastic article or earthenware shaping or treating: apparatus

Means casting fluent stock operably associated with shaping...

264169, 264216, 4253781, 425380, 425461, B29C 4714

Patent

active

049867466

ABSTRACT:
A process for preparing polymer film includes the step of extruding a molten thermoplastic polymer through a die provided with neck-down prevention pieces onto a rotating cooling drum, and cooling the polymer to solidify, wherein the neck-down prevention pieces are made of aluminum or alumina and provided with a cooling device.

REFERENCES:
patent: 2364435 (1944-12-01), Foster et al.
patent: 3223757 (1965-12-01), Owens et al.
patent: 3456293 (1969-07-01), De Smedt et al.
patent: 3870454 (1975-03-01), Penrod
patent: 3984508 (1976-10-01), Solop
patent: 4255365 (1981-03-01), Heyer
patent: 4693677 (1987-09-01), Shigemoto et al.

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