Blown tubing method and apparatus

Details Blown tubing method and apparatus Blown tubing method and apparatus

1984-06-29

1986-11-25

Czaja, Donald

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264565, 264566, 425 72R, 4253261, B29C 4904

Patent

active

046248234

ABSTRACT:
Apparatus for cooling plastic film or sheet obtained by blowing tubing, comprising at its intermediate section an intensive blowing ring for directing air towards the tubing and at its upper section an upper chamber in which the tubing is in contact with an air flow directed in the drawing direction of the tubing. At the lower section of the apparatus is a non-closed lower chamber provided with at least one opening. The apparatus can be used to form blown films having superior optical properties, particularly clarity and turbidity, from a large number of resins.

REFERENCES:
patent: 4080143 (1978-03-01), Upmeier
patent: 4115048 (1978-09-01), Alderfer et al.
patent: 4472343 (1984-09-01), Kawamura et al.

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