Process for producing, by blown film extrusion, a sleeve of viny

Details Process for producing, by blown film extrusion, a sleeve of viny Process for producing, by blown film extrusion, a sleeve of viny

1989-10-06

1991-03-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264564, 2642097, 4253791, B29C 4786

Patent

active

049976168

ABSTRACT:
The extruded sleeve is cooled at the end of the die by a circulation of a refrigerant fluid whose temperature To satisfies the relationship: ##EQU1## G being equal to: ##EQU2## Tm and V being the mean temperature of the resin at the exit of the die and its mean extrusion velocity,

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patent: 3769379 (1973-10-01), Hinrichs
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patent: 3936417 (1976-02-01), Ronden
patent: 3950118 (1976-04-01), Adair
patent: 4216253 (1980-08-01), Bonnebat et al.
patent: 4359439 (1982-11-01), Fritsch et al.
patent: 4663107 (1987-05-01), Takada et al.
patent: 4664866 (1987-05-01), van der Heijden

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