Apparatus for forming blown films

Details Apparatus for forming blown films Apparatus for forming blown films

1984-06-26

1985-03-19

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4253261, 264237, 264564, B29C 2500

Patent

active

045056579

ABSTRACT:
In apparatus for forming an inflation film of the type wherein a molten resin is ejected through a circular slit of a die, gas is blown into a resulting cylindrical film for inflating the film, and the cylindrical film is cooled by air ejected by an air ring, the air ring comprises an outer lip and an inner lip disposed closer to the die than the outer lip. The outer and inner lips form an air passage terminated with an air ejecting port, and the inner diameter of the outer lip increases in the direction of withdrawal of the cylindrical film. The air pressure in a space between the outer lip and the cylindrical film is reduced by Venturi tube effect or an evacuation device.

REFERENCES:
patent: 3507006 (1970-04-01), Princen
patent: 3568252 (1971-03-01), Masuda et al.
patent: 3835209 (1974-09-01), Karabedian
patent: 3888609 (1975-06-01), Saint Eve et al.
patent: 4259047 (1981-03-01), Cole
patent: 4272231 (1981-06-01), Schott, Jr.
patent: 4330501 (1982-05-01), Jones et al.
patent: 4373273 (1983-02-01), Church

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