Method and apparatus for extruding blown thermoplastic film tube

Details Method and apparatus for extruding blown thermoplastic film tube Method and apparatus for extruding blown thermoplastic film tube

1988-03-25

1989-06-27

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264566, 264567, 264569, 425 721, 4253261, 4253791, B29C 4788

Patent

active

048428035

ABSTRACT:
The rate for producing blown films of thermoplastic resins may be increased by using the extrusion and blowing apparatus of the invention, which includes a means of rapidly cooling the blown film at points both above and below the bubble frost line.

REFERENCES:
patent: 3754067 (1973-08-01), St. Eve et al.
patent: 4399094 (1983-08-01), Fujitani et al.
patent: 4479766 (1984-10-01), Planeta
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

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