Porous heat-shrinkable tetrafluoroethylene polymer tube and proc

Details Porous heat-shrinkable tetrafluoroethylene polymer tube and proc Porous heat-shrinkable tetrafluoroethylene polymer tube and proc

1987-05-28

1989-05-16

Schroeder, Werner H.

Pipes and tubular conduits

Structure

264127, F16L 912, C08J 900

Patent

active

048300624

ABSTRACT:
A tetrafluoroethylene polymer tube which is in a porous form composed of continuous pores and has heat-shrinkability in a radial direction or both radial direction and longitudinal direction of the tube, and a process for producing the same comprising applying pressure into inside of a tetrafluoroethylene polymer tube formed by paste extrusion molding a powder of the tetrafluoroethylene polymer and then sintered while heating the same to a temperature of not higher than the melting initiation temperature of the tetrafluoroethylene polymer to expand the tube to a radial direction only or both radial direction and longitudinal direction of the tube, and then cooling the tube in a pressurized state.

REFERENCES:
patent: 4110392 (1978-08-01), Yamazaki
patent: 4332035 (1982-06-01), Mano

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