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

1995-06-01

1996-09-03

Edwards, Newton

Plant husbandry

478364, 478394, 478421, 478422, D02G 300

Patent

active

055522190

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 fiber with even further improved tensile strength and modulus.

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