Artificial hair and method for manufacturing artificial hair

Abstract

Artificial hair includes a fiber bundle including a large crimp part having alternatively formed first peak parts and first valley parts with a minimum pitch of 1 mm or more. A minimum amplitude of the large crimp part is 0.30 mm or more and 4 mm or less, and the large crimp part includes a small crimp part having a pitch smaller than that of the large crimp part near one peak part. The small crimp part has alternatively formed second peak parts and second valley parts, and wherein a minimum amplitude of the small crimp part is smaller than the minimum amplitude of the large crimp part.

1 . Artificial hair comprising:
 a fiber bundle including a large crimp part having alternatively formed first peak parts and first valley parts with a minimum pitch of 1 mm or more,   wherein a minimum amplitude of the large crimp part is 0.30 mm or more and 4 mm or less, wherein the large crimp part includes a small crimp part having a pitch smaller than that of the large crimp part near one peak part,   wherein the small crimp part has alternatively formed second peak parts and second valley parts, and   wherein a minimum amplitude of the small crimp part is smaller than the minimum amplitude of the large crimp part.   
     
     
         2 . The artificial hair according to  claim 1 , wherein a minimum pitch of the small crimp part is 1.0 mm or more and 3.5 mm or less. 
     
     
         3 . The artificial hair according to  claim 1 , wherein the minimum amplitude of the small crimp part is more than 0 mm and 2 mm or less. 
     
     
         4 . The artificial hair according to  claim 1 , wherein the large crimp part has a minimum pitch of 3 mm or less. 
     
     
         5 . The artificial hair according to  claim 1 , wherein the fiber bundle has a flexion degree of 1.2 or more and 1.3 or less. 
     
     
         6 . The artificial hair according to  claim 1 , wherein the fiber bundle has an average flyaway hair rate of 23% or less at a portion of 10 cm from a hair tip when formed into a braid. 
     
     
         7 . The artificial hair according to  claim 1 , wherein the fiber bundle is composed of at least one raw material fiber selected from the group consisting of an acrylic fiber, a polyvinyl chloride fiber, a polypropylene fiber, and a polyethylene terephthalate fiber. 
     
     
         8 . The artificial hair according to  claim 7 , wherein the fiber bundle consists only of the one raw material fiber. 
     
     
         9 . The artificial hair according to  claim 8 , wherein the fiber bundle consists of a modacrylic fiber. 
     
     
         10 . The artificial hair according to  claim 1 , wherein a bulk of the fiber bundle is 180% or more and 520% or less with respect to a bulk of the raw material fiber bundle of the same weight. 
     
     
         11 . A method for manufacturing artificial hair comprising:
 a small crimp applying step of applying a small crimp part having alternatively formed second peak parts and second valley parts with a small crimp applying part obtained by heating a raw material fiber to form an in-progress fiber; and   a large crimp applying step of applying a large crimp part having alternatively formed first peak parts and first valley parts to the in-progress fiber with a heated large crimp applying part,   wherein the small crimp applying part and the large crimp applying part are both gear crimps,   wherein the small crimp applying part includes a pair of first gear parts engaged with each other,   wherein the large crimp applying part includes a pair of second gear parts engaged with each other,   wherein a total tooth length of the second gear parts in the large crimp applying part is 1 mm or more and larger than a total tooth length of the first gear parts,   wherein the small crimp applying step is performed before the large crimp applying step, and   wherein in the large crimp applying step, heating is performed at a temperature lower than that in the small crimp applying step.   
     
     
         12 . The method for manufacturing artificial hair according to  claim 11 , wherein a difference between the total tooth length of the first gear parts of the small crimp applying part and the total tooth length of the second gear parts of the large crimp applying part is 1 mm or more and 4 mm or less. 
     
     
         13 . The method for manufacturing artificial hair according to  claim 11 , wherein a pitch of the first gear parts of the small crimp applying part is 1 mm or more and 4.0 mm or less. 
     
     
         14 . The method for manufacturing artificial hair according to  claim 11 , wherein the total tooth length of the first gear parts of the small crimp applying part is 4.0 mm or less. 
     
     
         15 . The method for manufacturing artificial hair according to  claim 11 , wherein a ratio of a volume when the fiber after the large crimp applying step, which has the same weight as a predetermined weight of the raw material fiber, is braided to a volume when the raw material fiber having the predetermined weight is braided is 115% or more.