Process of making high strength, low shrinkage polyamide yarn

Details Process of making high strength, low shrinkage polyamide yarn Process of making high strength, low shrinkage polyamide yarn

1991-11-13

1993-08-31

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642108, 2642356, 2642905, 2642907, 264342RE, D01D 516

Patent

active

052406679

ABSTRACT:
An improved process for making high tenacity polyamide yarn of the type including the coupled steps of spinning, drawing the yarn at least about 5.OX in stages, the final draw stage employing final stage draw rolls which are heated to above about 200.degree. C., relaxing the yarn by advancing the yarn onto at least one tension letdown roll, and winding up the yarn. The improved process includes heating the yarn tension letdown roll to above about 200.degree. C., rotating the tension letdown roll at a peripheral speed which is at least about 11% less than the peripheral speed of the final stage draw rolls, and contacting the yarn between the final stage draw rolls and the tension letdown roll with tension control means for increasing the tension on the yarn advancing onto the tension letdown roll.

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