Method of and apparatus for manufacturing tubular thermoplastic

Details Method of and apparatus for manufacturing tubular thermoplastic Method of and apparatus for manufacturing tubular thermoplastic

1992-08-25

1993-09-28

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

2642097, 264327, 4253261, 4253791, 425467, B29C 4786

Patent

active

052484726

ABSTRACT:
In a method of and an apparatus for manufacturing a tubular thermoplastic resin film having a rough inner surface, the temperature of a mandrel located near a discharge port of a resin passage is set lower than the temperature of a die ring over a limited range in the circumferential direction of the discharge port. A cooling device is provided in the mandrel for cooling the portion of the mandrel located near the discharge port of the resin passage to a temperature lower than the temperature of the portion of the die ring located near the discharge port. The cooling device cools limited areas on the surface of the mandrel. These limited areas are spaced around the circumferential of the discharge port of the resin passage.

REFERENCES:
patent: 2876497 (1959-03-01), Alexander
patent: 3508554 (1970-04-01), Sheridan
patent: 3767346 (1973-10-01), Mihalik
patent: 4229407 (1980-10-01), Craig
patent: 4329314 (1982-05-01), Jackson et al.
patent: 4359439 (1982-11-01), Fritsch et al.
patent: 4997616 (1991-03-01), Dehennau et al.

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