Toray Industries, Inc.

Noboru Ueno

Takao Negishi

Hiroaki Date

A false twisting yarn composed of monofilaments containing a polyester component of which main component is polytrimethylene terephthalate, wherein the false twisting yarn is a false twisting yarn which satisfies all of the requirements of (1) a shrinkage ratio by wet heat treatment at 98&#xb0; C. for 20 minutes is 5% or less, (2) a ratio (TS/WS) of elastic stretch ratio after wet heat treatment at 90&#xb0; C. for 20 minutes (WS) and elastic stretch ratio after dry heat treatment at 90&#xb0; C. for 15 minutes (TS) is, 0&#x3c;TS/WS&#x2266;1, and (3) a tensile strength is 2.0 cN/dtex or more. By using the false twisting yarn, it is possible to produce a pile cloth having a soft touch and a low shrinkage.

False twisting yarn and production method thereof

Method and apparatus for high speed false twist texturing of yarns, which makes it possible to perform false twist texturing smoothly at a yarn speed of 1,000 m/min or higher. The number of false-twists inserted per meter of yarn is determined by Equation 1, while the yarn is false-twisted at a yarn speed satisfying Equation 2 and at a short yarn path length satisfying Equation 3: ##EQU1## wherein T is the number of false-twists inserted per meter of yarn, V is the yarn speed of false twist texturing (m/sec), L is the yarn path length from teed rollers to a false twister (m), and A is a cross sectional area of the yarn (m.sup.2), which is obtained by dividing the denier of the yarn by the density of the yarn. The false-twist texturing apparatus includes feed rollers feeding yarn to a false-twisting zone, a heating device bringing the yarn into direct contact with steam, a cooling device bringing the yarn into direct contact with water, a false twister and delivery rollers, in this order.

Growing community of inventors

Tokyo, Japan

Noboru Ueno