Process for preparing tubular film of hydrolyzed ethylene-vinyl

Details Process for preparing tubular film of hydrolyzed ethylene-vinyl Process for preparing tubular film of hydrolyzed ethylene-vinyl

1977-10-04

1979-08-14

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264173, 264185, 264237, 2642902, B29D 2304

Patent

active

041645294

ABSTRACT:
In a typical tubular extrusion of hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 15 to 50% by mole and a degree of hydrolysis in the vinyl acetate units of not less than 90% by mole, an improved process for preparing the tubular film without wrinkle by controlling the surface temperature of the tubular film at the nip rolls within the range of 50.degree. to 100.degree. C.

REFERENCES:
patent: 3061884 (1962-11-01), Hirano et al.
patent: 3425979 (1969-02-01), Monaghan et al.
patent: 3595735 (1971-07-01), Tyrrell
patent: 3957941 (1976-05-01), Kawaguchi

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