Abstract: Improvement in a melt-spinning process, so as to prepare a terephthalate polyester yarn containing two types of filaments, one having in cross section not more than one axis of planar symmetry, and being weaker and having a lower elongation at break than the second type of filaments which have a plurality of axes of planar symmetry. The improvement involves spinning the second type through capillaries that are recessed, in relation to those for the first type, and directing quenching air to strike first the filaments of the first type.

Abstract: A spinneret plate having capillaries of different length, and preferably capillaries of different cross-sectional shape. The spinning plate has a boss through which some of the capillaries pass.

Abstract: Polyester feed yarn for drawtexturing, having an elongation at break of 30 to 150 percent, is composed of three different types of filaments. (A) 20 to 40 percent of the filaments consist of a polymer of ethylene terephthalate and 0 to 3 mole percent of modifying groups for imparting cationic dyeability. (B) 20 to 40 percent of the filaments consist of a copolymer of ethylene terephthalate and about 5 to 15 mole percent of other ester units. (C) 15 to 35 weight percent of the yarn consists of eccentric bicomponent filaments of the above two polymers. The bicomponent filaments have a smaller denier and lower elongation at break than the other filaments, so that the bicomponent filaments can be broken preferentially when the yarn is drawtextured to provide spun-like tactility. When broken, the bicomponent filaments helically crimp and become entangled in the yarn bundle with a slight, uniform protrusion of ends above the surface which provides good resistance to pilling in fabrics.

Abstract: A twist-free texturing feed yarn of drawn thermoplastic filaments is prepared from a bundle (A) of filaments having a melting point of 255.degree. to 275.degree. C. and a bundle (B) of filaments having a melting point above 230.degree. C. which is 15.degree. to 39.degree. C. lower than that of the filaments of bundle (A). The bundles differ in coloration or affinity for dyestuffs. The feed yarn is false-twist textured at a temperature 53.degree. to 78.degree. C. lower than the melting point of the filaments of bundle (A) to produce a textured yarn which provides a heather of high contrast and low directionality (no color streaks) in fabric made from the yarn. Filament compositions illustrated are poly(ethylene terephthalate) or poly[ethylene terephthalate/5-(sodium sulfo)isophthalate] or poly(hexamethylene adipamide) for bundle (A); and poly(ethylene terephthalate/glutarate) or poly(ethylene terephthalate/adipate) or poly(ethylene/2,2-dimethyl-1,3-propylene terephthalate) for bundle (B).

Abstract: Continuous, mixed filament yarns are provided as well as a process for preparing them in which at least two different continuous filament yarns are cospun and separately entangled; the entangled yarns are consolidated and drawn to yield from 0.5-6 entanglements/meter in the consolidated yarn after drawing, and the drawn yarn is intermingled to yield a product yarn having a degree of filament intermingling of 45-80%, a denier of 70-260 and 20-68 filaments.