Method for the manufacture of thin tubes of fluorinated resin, p

Details Method for the manufacture of thin tubes of fluorinated resin, p Method for the manufacture of thin tubes of fluorinated resin, p

1991-05-29

1993-05-04

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With twining, plying, braiding, or textile fabric formation

72 96, 156149, 156194, 264127, 264293, 264310, 264323, 26433114, 264334, 264DIG66, 264291, 425329, 425393, 425402, 425DIG55, B29C 5526, B29C 3936

Patent

active

052079600

ABSTRACT:
A process for the manufacture of a thin-walled tube of fluorinated resin, particularly polytetrafluoroethylene, in which a ribbon of fluorinated resin obtained by lubricated extrusion and calendaring, is wound into a tube on a mandrel, the winding of the ribbon being performed in a plurality of layers, and the thus-wound ribbon on the mandrel being brought to a temperature above the sintering temperature of the fluorinated resin for sufficient time to produce sintering. The wound tube and the mandrel are cooled; while on the mandrel the thin-walled tube is rolled to elongate the tube, to reduce the thickness of the tube, and to increase the inside diameter of the tube; and then the mandrel within the tube is extracted.

REFERENCES:
patent: 2964065 (1960-12-01), Haroldson et al.
patent: 3089187 (1963-05-01), Wolfe
patent: 3566653 (1971-03-01), Unrath
patent: 3695076 (1972-10-01), Kocks
patent: 4478898 (1984-10-01), Kato
patent: 4577481 (1986-03-01), Staat
patent: 4898702 (1990-02-01), Elkins et al.
patent: 5109689 (1992-05-01), D'Avanzo

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