Elastic composite twisted yarn, method for preparing elastic composite twisted yarn, and pile fiber product using the same

Abstract

An elastic composite twisted yarn includes a covered elastic yarn, having a core yarn formed of an elastic yarn and a sheath yarn formed of a thermoplastic multi filament, and first and second low stretch yarns formed of a thermoplastic multi-filament yarn or a spun yarn. The covered elastic yarn is drawn at a predetermined draw ratio to be inserted into the first low stretch yarn in a combined yarn state. The yarn in the combined yarn state and the second low stretch yarn are combined and twisted to obtain an elastic composite twisted yarn. A plurality of heteromorphic micro-loops formed of a constituent single fiber of the sheath yarn, which appears during the relaxation by a contractile force of the covered elastic yarn, protruding from the core yarn to a diameter direction, is usually incorporated into a constituent single fiber of the first low stretch yarn and thermally set.

1 . An elastic composite twisted yarn comprising a covered elastic yarn obtained by covering a core yarn formed of an elastic yarn having a self-stretchability with a thermoplastic multi-filament as a sheath yarn, and two or more low stretch yarns including first and second low stretch yarns formed of a thermoplastic multi-filament yarn or a spun yarn, wherein:
 the elastic composite twisted yarn is formed by inserting the covered elastic yarn into the first low stretch yarn under drawing at a predetermined draw ratio in a combined yarn state; and   twisting the second low stretch yarn and the first low stretch yarn with the covered elastic yarn inserted, and,   in the elastic composite twisted yarn, a plurality of heteromorphic micro-loops formed of a constituent single fiber of the sheath yarn, which appears during relaxation by a contractile force of the covered elastic yarn, protruding from the core yarn to a diameter direction is incorporated into constituent single fibers of the first low stretch yarn and thermally set.   
     
     
         2 . The elastic composite twisted yarn according to  claim 1 , wherein the core yarn of the covered elastic yarn is a polyurethane yarn, a natural or synthetic rubber, or a crimp-processed yarn. 
     
     
         3 . The elastic composite twisted yarn according to claim  claim 1 , wherein the sheath yarn of the covered elastic yarn and the first and second low stretch yarns are a multi-filament formed of the same or different material(s). 
     
     
         4 . The elastic composite twisted yarn according to  claim 3 , wherein two or more strands of the covered elastic yarns are inserted into the first low stretch yarn. 
     
     
         5 . The elastic composite twisted yarn according to  claim 3 , wherein the thermoplastic multi-filament is formed of any of propylene, polyester or polyamide, or a combination of them. 
     
     
         6 . The elastic composite twisted yarn according to  claim 3 , wherein a fineness of a single fiber constituting the sheath yarn is equivalent to or less than that of a single fiber constituting the low stretch yarns. 
     
     
         7 . The elastic composite twisted yarn according to  claim 1 , wherein the number of twists of the elastic composite twisted yarn after the thermal setting is from 48 to 430 times/m. 
     
     
         8 . A method for preparing the elastic composite twisted yarn according to  claim 1 , the method including:
 aligning two or more strands of covered elastic yarns, which are obtained by covering a core yarn formed of an elastic yarn having self-stretchability with a thermoplastic multi-filament serving as a sheath yarn under tension, with a first low stretch yarn formed of a thermoplastic multi-filament yarn or a spun yarn, introducing the aligned yarns into a rotation member corresponding to a lower flyer rotating in one direction, and then drawing the strands toward a cording point disposed on the upper side;   accommodating a second low stretch yarn formed of a thermoplastic multi-filament yarn or a spun yarn in a fixed pot disposed adjacent to an upper portion of the rotation member;   taking said corresponding second low stretch yarn out to be drawn toward the cording point disposed on the upper side from the center of the pot;   forming a balloon between the rotation member and the cording point and twist-combining a combined yarn including the covered elastic yarn drawn upwardly and the first low stretch yarn with a second low stretch yarn drawn upwardly from the shaft center of the pot at the coding point; and   winding the composite twisted yarn which has passed through the cording point.   
     
     
         9 . The method for preparing the elastic composite twisted yarn according to  claim 8 , wherein the method comprises:
 adjusting, by intermittently rotating the rotation member, a tension of the covered elastic yarn and the first low stretch yarn, which are wound around the rotation member; and   adjusting the tension of the second low stretch yarn drawn from the inside of the pot between the pot and the cording point.   
     
     
         10 . The method for preparing the elastic composite twisted yarn according to  claim 9 , wherein the method includes relaxing the wound composite twisted yarn, followed by thermal setting. 
     
     
         11 . A pile fiber product, wherein the elastic composite twisted yarn according to  claim 1  is used as a pile yarn. 
     
     
         12 . The pile fiber product according to  claim 11 , wherein the pile fiber product includes various floor coverings or an interior automotive trim.