D - Textiles – Paper – 02 – G
Patent
D - Textiles, Paper
02
G
D02G 3/02 (2006.01) D01F 6/62 (2006.01) D02J 1/08 (2006.01)
Patent
CA 2358715
The present invention relates to polyester yarn which is characterized in that it is a multifilament yarn substantially comprising polytrimethylene terephthalate, and as well as the strength from the stress-strain curve being at least 3 cN/dtex and the Young's modulus being no more than 25 cN/dtex, the minimum value of the differential Young's modulus at 3-10% extension is no more than 10 cN/dtex and the elastic recovery following 10% elongation is at least 90%. Furthermore, said polyester yarn can be obtained by a method of producing polyester yarn which is characterized in that multifilament yarn obtained by the melt spinning of polymer substantially comprising polytrimethylene terephthalate of intrinsic viscosity [.eta.] at least 0.7 is hauled-off at a spinning rate of at least 2000 m/min and, without winding up, subjected to drawing and heat-treatment, after which it is continuously subjected to a relaxation heat treatment at a relaxation factor of 6 to 20% and wound up as a package. Moreover, the present invention also relates to a woven material of outstanding soft-stretchability which is characterized in that the aforesaid polyester yarn is used as the warp yarn and/or the weft yarn in the form of twisted yarn of twist coefficient 10,000 to 20,000. In this way, it is possible to produce yarn stably at a high yarn production rate without package tightening occurring, and, as well as there being little variation in properties in the fibre lengthwise direction, when made into fabric, said fabric stretches at low modulus so there is little sense of tightness, and it is possible to provide polyester yarn and woven materials with a soft handle.
L'invention concerne un multifilament constitué essentiellement de téréphtalate de polytriméthylène, caractérisé par une résistance dans une courbe contrainte-déformation supérieure ou égale à 3 cN/dtex, un module de Young inférieur ou égal à 25 cN/dtex, un module de Young différentiel minimal, dans une plage d'allongement allant de 4 à 10 %, inférieur ou égal à 10 cN/dtex et une reprise élastique, après 10 % d'allongement, supérieure ou égale à 90 %. L'invention concerne également un procédé de production d'un fil de polyester, caractérisé par les étapes suivantes : filage par fusion d'un téréphtalate de polytriméthylène présentant un indice limite de viscosité [ eta ] supérieur ou égal à 0,7, pour former un multifilament ; filage du multifilament à une vitesse supérieure ou égale à 2000 m/min ; étirement du fil et traitement simultané à la chaleur, sans enroulement temporaire ; relaxation du fil obtenu à un degré de relaxation compris entre 6 et 20 % ; enroulement du fil pour former une bobine. Ce fil de polyester et un tissu obtenu à partir de ce dernier sont dépourvus d'enroulement excessivement serré même lorsque le fil est filé à grande vitesse. De plus, la dispersion de leurs propriétés dans le sens longitudinal de la fibre et la sensation de compression sont réduites.
Maeda Yuhei
Mochizuki Katsuhiko
Sugano Koji
Smart & Biggar
Toray Industries Inc.
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