Composite yarn, preparation method thereof and elastic fabric

Abstract

The present invention relates to a composite yarn, a preparation method thereof and an elastic fabric, wherein the composite yarn comprises a core yarn and an outer wrapping yarn, wherein the core yarn further comprising at least one piece of elastic filament, and wherein the outer wrapping yarn is made of short fiber, wherein the outer wrapping yarn is spirally wrapped on the core yarn, wherein drafting ratio of the core yarn is 1-1.5 times.

What is claimed is: 
     
         1 . A composite yarn, comprising:
 a core yarn, and   an outer wrapping yarn, wherein the core yarn further comprising at least one piece of elastic filament, and wherein the outer wrapping yarn is made of short fiber, wherein the outer wrapping yarn is spirally wrapped around the core yarn, and the drafting ratio of the corn yarn is 1-1.5 times.   
     
     
         2 . The composite yarn of  claim 1 , wherein the twisting degree of the outer wrapping yarn is 8.48-36 twists/inch, and wherein length of the outer wrapping yarn is more than 1.5 times that of the core yarn. 
     
     
         3 . The composite yarn of  claim 1 , wherein number of winding turns of the outer wrapping yarn on the core yarn is greater than 15 per 1 cm. 
     
     
         4 . The composite yarn of  claim 1 , wherein number of winding turns of the outer wrapping yarn on the core yarn is 15-40 per 1 cm. 
     
     
         5 . The composite yarn of  claim 1 , wherein counts of the outer wrapping yarn are 10-80S, and denier of the core yarn is 20D-500D. 
     
     
         6 . The composite yarn of  claim 1 , wherein the short fiber is a fiber having a length ranging from 10-90 mm, and wherein the short fiber is a natural fiber or a chemical fiber. 
     
     
         7 . The composite yarn of  claim 1 , wherein the short fiber is a cotton fiber, a tencel fiber, a modal fiber, a polyester fiber or a nylon fiber. 
     
     
         8 . The composite yarn of  claim 1 , wherein the short fiber is a cotton fiber. 
     
     
         9 . A preparation method of the composite yarn of  claim 1 , comprising the steps of:
 Processing short fiber into a rough yarn, and processing rough yarn into an outer wrapping yarn through a spinning process;   Placing a corn-yarn spool on a feeding roller, drawing the core yarn into a hollow spindle through a pre-drafting roller, and imposing a drafting force having a drafting ratio of 1-1.5 times on the core yarn by the pre-drafting roller;   Feeding the core yarn into the hollow spindle, making the core yarn pass through the center of the hollow spindle, and leading out the outer wrapping yarn along with the rotation of the hollow spindle, thus making the outer wrapping yarn wrap on the hollow spindle; through an air-ring guiding hook, a yarn-guiding roller and a pressing roller, winding to obtain a finished composite yarn, wherein during the wrapping process, the twisting degree of the outer wrapping yarn is 900-1500 twists/m.   
     
     
         10 . An elastic fabric, comprising interweaving a warp yarn or a weft yarn, wherein the weft yarn is the composite yarn as described in  claim 1 .