Multifilament yarns of thermoplastic polymers based on tetrafluo

Details Multifilament yarns of thermoplastic polymers based on tetrafluo Multifilament yarns of thermoplastic polymers based on tetrafluo

1993-10-27

1995-10-24

Edwards, N.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428357, 428393, 526254, 526247, D02G 300

Patent

active

054608821

ABSTRACT:
A multifilament yarn of a thermoplastic polymer based on tetrafluoroethylene, having high mechanical strength and dimensional stability at high temperatures (200.degree.-250.degree. C.), is prepared by melt extrusion through a die characterized by a hole density comprised between 10 and 150 holes/cm.sup.2 and provided with a cooling system of the emerging yarn of high efficiency and uniformity. The multifilament yarn can be subsequently drawn to obtain a drawn multifilament yarn with even further improved tensile strength and modulus.

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