Bulky yarn

Abstract

An object of the present invention is to provide a bulky yarn made of synthetic fibers, which is suppressed in tanglement between filaments while having a loop shape in the surface layer thereof, and has a soft texture and is light and excellent in heat retention properties while being good in handleability in high-order processing. The present invention provides a bulky yarn made of synthetic fibers, including: a sheath yarn having a three-dimensional crimped structure; and a core yarn twisted with the sheath yarn to fix the sheath yarn, wherein the sheath yarn is not substantially broken and continuously forms loops.

What is claimed: 
     
         1 . A bulky yarn made of synthetic fibers, comprising:
 a sheath yarn; and   a core yarn twisted with the sheath yarn to fix the sheath yarn,   wherein the sheath yarn has a spiral structure with a radius of curvature of 2 mm to 30 mm;   by 10 sites randomly selected from the single bulky yarn consisting of the sheath yarn and the core yarn, and the textured yarn is photographed at a magnification at which 10 or more sections from a twist point between the core yarn and the sheath yarn to the next twist point (that is, each section is one loop) can be recognized in the longitudinal direction of the textured yarn, and observed for the determination each of the 10 photographed images, the number of breaking points of the sheath yarn per 1 mm of the bulky yarn was counted for 10 loops, and the average of the number of breaking points of the loops was calculated, and the average was rounded off to the first decimal place to give the number of breaking points of the loops (number/mm), and the number of breaking points on average of the total of 100 loops is 0.2/mm or less.   
     
     
         2 . The bulky yarn according to  claim 1 , wherein the fibers that constitute the bulky yarn have a single yarn fineness of 3.0 dtex or more,
 the core yarn and the sheath yarn have a single yarn fineness ratio (sheath/core) in a range of 0.5 to 2.0,   the core yarn and the sheath yarn have 1/mm to 30/mm twist points in a fiber axis direction of the bulky yarn, and   the crimped structure of the sheath yarn has a radius of curvature of 2 mm to 30 mm.   
     
     
         3 . The bulky yarn according to  claim 1 , wherein both or one of the core yarn and the sheath yarn has a hollow rate of 20% or more, and
 the bulky yarn have a single yarn fineness of 3.0 dtex or more.   
     
     
         4 . The bulky yarn according to  claim 1 , wherein the core yarn and the sheath yarn are monocomponent fibers of same type. 
     
     
         5 . A textile product, comprising the bulky yarn according to  claim 1  in at least part thereof.