Abstract: An improvement is provided in an integrated process for the production of textured multifilament yarn from a fiber-forming, thermoplastic, linear, high-molecular-weight polymer of caprolactam by the combination in immediate succession of the procedural steps of melt spinning, drawing, texturing, and packaging. The present improvement combines the following procedural steps with those of melt spinning, drawing, texturing, and packaging:(1) Lubricating the filamentary polymeric material from the melt spinning step by applying thereto a lubricating composition containing (a) a lubricant, and (b) solvent in an amount of from 0 to 20 percent by weight of the lubricating composition;(2) Pre-tensioning the lubricated melt spun filamentary polymeric material beyond its elastic limit between a first godet at room temperature, viz. between about 15.degree. and 25.degree. C.; followed by(3) Pre-heating the pre-tensioned filamentary polymeric material on a second godet to a temperature between about 40.degree. and 70.

Abstract: A liquid receptacle in the form of a chamber has a slit in one section thereof, the elongated sides of the slit being parallel straight lines. The chamber communicates through another section thereof with means for the supply thereto of a liquid treating composition at a controlled rate. Guide means configures a traveling multi-filament textile yarn in a close-packed monofilamentary layer and directs the so-configured traveling textile yarn under a desired tension and at a right angle over the slit and in contact with the chamber at a point downstream of the slit and in proximity thereto. The minimum length of the slit is equal to the total width of the traveling textile yarn when configured in a close-packed monofilamentary layer; and the width of the slit is between about 0.001 and 0.01 inches.

Abstract: Melt spun yarns are treated with a finish which is an aqueous solution or dispersion containing an alkoxylated alcohol or thiol as the sole essential organic component thereof.