Fiber bundle for artificial hair, method for manufacturing fiber bundle for artificial hair, and in-process fiber band

Abstract

The present invention provides a fiber bundle for artificial hair, a method for manufacturing a fiber bundle for artificial hair, and an in-progress fiber strip, which can reproduce light and natural hair ends as compared with a conventional technique. The present invention is configured to include a plurality of fibers and a fixing part that fixes an intermediate portion of a plurality of the fibers. A plurality of the fibers are bundled by the fixing part, and both longitudinal ends are not aligned, and when 300 fibers are randomly extracted from a plurality of the fibers and the extracted 300 fibers are placed in order of length, in a range of 50th to 250th fibers counting from longer ones, a difference in length between adjacent fibers is 3 cm or less, and the number of fibers having a same length is 30 or less.

1 . A fiber bundle for artificial hair, comprising:
 a plurality of fibers; and   a fixing part that fixes an intermediate portion of the plurality of fibers, wherein the plurality of fibers are bundled by the fixing part, and both longitudinal ends thereof are not aligned, and   when 300 fibers are randomly extracted from the plurality of fibers and the extracted 300 fibers are placed in order of length, in a range of 50th to 250th fibers counting from longer ones, a difference in length between adjacent fibers is 3 cm or less, and a number of fibers having a same length is 30 or less.   
     
     
         2 . The fiber bundle for artificial hair according to  claim 1 , wherein
 a length of a longest fiber among the plurality of fibers is 10 cm or more, and a difference between the length of the longest fiber and a length of a shortest fiber is 3 cm or more,   the plurality of fibers include an intermediate fiber in addition to the longest fiber and the shortest fiber,   the intermediate fiber is shorter than the length of the longest fiber by 1 cm or more and longer than the length of the shortest fiber by 1 cm or more, and   a length in a longitudinal direction of the fiber bundle for artificial hair is longer than the length of the longest fiber.   
     
     
         3 . The fiber bundle for artificial hair according to  claim 1 , wherein a total length thereof is 1 m or more. 
     
     
         4 . The fiber bundle for artificial hair according to  claim 1 , wherein the plurality of fibers have a crimp. 
     
     
         5 . A method for manufacturing a fiber bundle for artificial hair, the method comprising:
 a strip-shaped body forming step of forming a strip-shaped body by arranging fibers in a strip shape; and   a cutting step of cutting an intermediate portion of the strip-shaped body so that a cut portion satisfies a condition (1) or (2) below:   (1) the cut portion has at least two first recesses in an intermediate portion in a width direction, and the two first recesses form a first projecting portion; or   (2) the cut portion has at least two first projecting portions in an intermediate portion in the width direction, and the two first projecting portions form a first recess.   
     
     
         6 . The method for manufacturing a fiber bundle for artificial hair according to  claim 5 , wherein
 the cutting step includes cutting an intermediate portion of the strip-shaped body to cut the strip-shaped body into a first in-progress fiber strip and a second in-progress fiber strip,   the cut portion of the first in-progress fiber strip has at least two first recesses in an intermediate portion in a width direction, and the two first recesses form a first projecting portion, and   the cut portion of the second in-progress fiber strip has at least two second projecting portions in an intermediate portion in the width direction, and the two second projecting portions form a second recess.   
     
     
         7 . The method for manufacturing a fiber bundle for artificial hair according to  claim 5 , wherein a length of the first projecting portion is 5 cm or more and 40 cm or less. 
     
     
         8 . The method for manufacturing a fiber bundle for artificial hair according to  claim 5 , wherein the first projecting portion has a triangular shape or an arc shape. 
     
     
         9 . The method for manufacturing a fiber bundle for artificial hair according to  claim 8 , wherein an angle of a vertex of the first projecting portion is 10 degrees or more and 70 degrees or less. 
     
     
         10 . The method for manufacturing a fiber bundle for artificial hair according to  claim 5 , further comprising a hackling step that is a step after the cutting step, the hackling step including forming a bundle body by bundling the cut strip-shaped body, and performing hackling of the bundle body. 
     
     
         11 . An in-progress fiber strip used for manufacturing a fiber bundle for artificial hair, the in-progress fiber strip comprising:
 a plurality of fibers arranged in a strip shape; and   a first end region on one end side in a longitudinal direction,   the first end region satisfying a condition (3) or (4) below:   (3) the first end region has at least two first recesses in an intermediate portion in a width direction, and the two first recesses form a first projecting portion; or   (4) the first end region has at least two first projecting portions in an intermediate portion in the width direction, and the two first projecting portions form a first recess.   
     
     
         12 . The in-progress fiber strip according to  claim 11 , further comprising a second end region on another end side in the longitudinal direction, the second end region satisfying a condition (5) or (6) below:
 (5) the second end region has at least two second recesses in an intermediate portion in the width direction, and the two second recesses form a second projecting portion; or   (6) the second end region has at least two second projecting portions in an intermediate portion in the width direction, and the two second projecting portions form a second recess.   
     
     
         13 . The in-progress fiber strip according to  claim 12 , wherein a length of the first projecting portion is 5 cm or more and 40 cm or less. 
     
     
         14 . The in-progress fiber strip according to  claim 11 , wherein the first projecting portion has a triangular shape or an arc shape. 
     
     
         15 . The in-progress fiber strip according to  claim 14 , wherein an angle of a vertex of the first projecting portion is 10 degrees or more and 70 degrees or less.