Cooling thermoplastic tubes

Details Cooling thermoplastic tubes Cooling thermoplastic tubes

1974-06-17

1976-11-23

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264178R, 264210R, 264237, 425326R, B29D 2304

Patent

active

039937232

ABSTRACT:
Cooling an extruding thermoplastic tube by feeding the tube adjacent a cooling surface, maintaining a sheath of heat-transfer fluid between the tube and surface and preferentially cooling at least a selected area of the tube by transversely displacing the tube to decrease the thickness of the sheath between the selected area and the cooling surface. The invention is particularly suitable, for the production of thermoplastic films by orienting a cast tubular extrudate which has been cooled by means of an internal mandrel.

REFERENCES:
patent: 2926384 (1960-01-01), Hertz et al.
patent: 3596321 (1971-08-01), Upmeier
patent: 3725519 (1973-04-01), Seifried et al.
patent: 3814785 (1974-06-01), Reade
patent: 3819776 (1974-06-01), Robinson et al.

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