Spun yarn, and yarn and cloth including spun yarn

Abstract

A spun yarn that includes at least a first short fiber that is a piezoelectric fiber that generates a potential by applied external energy, and that has a length of 800 mm or less. The spun yarn preferably includes a plurality of short fibers that are twisted together with each other.

1 . A spun yarn, comprising at least a first short fiber that generates a potential by external energy and has a length of 800 mm or less. 
     
     
         2 . The spun yarn according to  claim 1 , wherein the length of the first short fiber is 10 mm to 800 mm. 
     
     
         3 . The spun yarn according to  claim 1 , wherein a fineness of the first short fiber is 0.3 dtex to 10 dtex. 
     
     
         4 . The spun yarn according to  claim 1 , further comprising:
 a second short fiber; and   a third short fiber,   wherein a first end side in a longitudinal direction of the first short fiber is restrained by the second short fiber, and a second end side in the longitudinal direction of the first short fiber is restrained by the third short fiber.   
     
     
         5 . The spun yarn according to  claim 4 , wherein a coefficient of static friction of the second short fiber or the third short fiber is higher than that of the first short fiber. 
     
     
         6 . The spun yarn according to  claim 4 , wherein the first short fiber, the second short fiber, and the third short fiber have a crimped portion, and the first short fiber is restrained by the crimped portion. 
     
     
         7 . The spun yarn according to  claim 1 , wherein the first short fiber is inclined relative to an axial direction of the spun yarn. 
     
     
         8 . The spun yarn according to  claim 7 , wherein an angle of the first short fiber relative to an axial direction of the spun yarn ranges from 0 degrees to 80 degrees. 
     
     
         9 . The spun yarn according to  claim 8 , wherein the angle of the first short fiber relative to the axial direction of the spun yarn is 20 degrees to 50 degrees. 
     
     
         10 . The spun yarn according to  claim 4 , wherein a fineness of the first short fiber, the second short fiber, and the third short fiber is 0.3 dtex to 10 dtex. 
     
     
         11 . The spun yarn according to  claim 4 , wherein lengths of the first short fiber, the second short fiber, and the third short fiber are 10 mm to 800 mm. 
     
     
         12 . The spun yarn according to  claim 4 , wherein the first short fiber, the second short fiber, and the third short fiber have a fiber count of one to 500. 
     
     
         13 . The spun yarn according to  claim 4 , wherein the first short fiber, the second short fiber, and the third short fiber have different lengths. 
     
     
         14 . The spun yarn according to  claim 4 , wherein the second short fiber and the third short fiber are fibers having no piezoelectricity. 
     
     
         15 . The spun yarn according to  claim 14 , wherein the second short fiber and the third short fiber comprise a material having a higher hydrophilicity as compared with that of the first short fiber. 
     
     
         16 . The spun yarn according to  claim 1 , wherein the first short fiber is a piezoelectric fiber and comprises a chiral polymer. 
     
     
         17 . The spun yarn according to  claim 16 , wherein the chiral polymer is polylactic acid. 
     
     
         18 . The spun yarn according to  claim 4 , wherein at least one of the first short fiber, the second short fiber, and the third short fiber has a groove or a protrusion extending in a longitudinal direction of the first short fiber, the second short fiber, and the third short fiber. 
     
     
         19 . A yarn, comprising:
 a plurality of the spun yarns according to  claim 1 ,   wherein the plurality of the spun yarns include a right-twisted yarn and a left-twisted yarn.   
     
     
         20 . A cloth, comprising:
 a spun yarn according to  claim 1 .