Highly intensive cooling process and apparatus for the productio

Details Highly intensive cooling process and apparatus for the productio Highly intensive cooling process and apparatus for the productio

1988-10-07

1990-07-03

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264566, 264569, 425 721, 4253261, 425192R, B29C 4790

Patent

active

049389033

ABSTRACT:
An apparatus for highly intensive cooling of biaxially oriented films from high- and medium-molecular weight thermoplastics using a long neck on a blown film line is described, including: a plastics extruder, a die for forming a tube neck from the extruded plastic, means positioned adjacent the die for externally cooling the tube neck, an expansion zone where the tube neck becomes a bubble, a drag mandrel positioned immediately before the expansion zone for internally contacting, stabilizing and guiding the tube neck, means for continuously providing cool air internally of the tube neck at the expansion zone immediately after the contact, the means including a first tube in communication with a cool air source, and means for continuously removing the cool air that has been heated. A related method includes the steps of: extruding plastic material through a die to form a tube neck, externally cooling the tube neck immediately after emergence of the tube neck from the die, internally contacting, stabilizing, and guiding the tube neck into a bubble, immediately before the expansion zone, by using a drag mandrel, continuously internally cooling the bubble in the expansion zone immediately after the tube neck contacts the drag mandrel, and continuously removing the cool air that has been heated by the thermoplastic.

REFERENCES:
patent: 4019843 (1977-04-01), Zimmermann
patent: 4189288 (1980-02-01), Halter
patent: 4251199 (1981-02-01), Imaizumi et al.
patent: 4606879 (1986-08-01), Cerisano
patent: 4624823 (1986-11-01), Audureau et al.
patent: 4626397 (1986-12-01), Bose
patent: 4632801 (1986-12-01), Dowd
patent: 4643657 (1987-02-01), Achelpohl et al.
patent: 4678417 (1987-07-01), Upmeier

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