Process and apparatus for cooling a molten film extruded from a

Details Process and apparatus for cooling a molten film extruded from a Process and apparatus for cooling a molten film extruded from a

1989-02-15

1990-03-27

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421113, 264216, 264237, 425 71, 425224, 425325, 425377, 4253781, B29C 4126, B29C 4146, B29C 4788

Patent

active

049118749

ABSTRACT:
A molten film extruded from a slot die onto a take-off drum in a cooling system is first cooled on the circumferential surface of the take-off drum and by the ambient air, is subsequently passed into the water bath of a water trough in which the take-off drum is immersed, and finally is transferred from the water bath of the water trough into a post-cooling water bath, in which the film solidifies to an intermediate film having a desired final temperature of approximately 40.degree. C. When the film leaves the take-off drum, the partially solidified molten film has a mean temperature T.sub.u of between 100.degree. C. and 120.degree. C. For optimization of the dwell time of the molten film in the cooling system and in the post-cooling water bath, the drum diameter D of the take-off drum and the length L of the post-cooling water bath are determined by a specific relationship.

REFERENCES:
patent: 2344603 (1944-03-01), Czapek
patent: 3277519 (1966-10-01), Jones
patent: 3324218 (1967-06-01), Gebler et al.

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