The high intensity, it is low production manner null of the coefficient of contraction polyamide

摘要

An improved process for making high tenacity polyamide yarn of the type including the coupled steps of spinning, drawing the yarn at least about 5.0X in stages, the final draw stage employing final stage draw rolls which are heated to above about 200 °C, relaxing the yarn by advancing the yarn onto at least one tension let-down roll, and winding up the yarn. The improved process includes heating the yarn tension let-down roll to above about 200 °C, rotating the tension let-down 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 let-down roll with tension control means for increasing the tension on the yarn advancing onto the tension let-down roll.