Stretch-processed yarn, fiber product, composite spinneret, and composite fiber production method

Abstract

A composite spinneret for discharging a composite polymer flow comprising a first component polymer and a second component polymer includes a measurement plate having a plurality of measurement holes for measuring each polymer component, one or more distribution plates having distribution holes for distributing each polymer component, and a discharge plate. In a lowermost layer downstream in a polymer spinning path, a polymer distribution hole group is formed in which a plurality of semicircularly arranged first component polymer distribution holes are surrounded by second component polymer distribution holes. At least some of the second component polymer distribution holes are arranged in a semicircular arc on an outer side of the circumferential portion of the first component holes. The number Ho of the arc-arranged second component holes relative to the total number Ht of second component holes in the group satisfies 1/16<Ho/Ht<¼.

What is claimed is: 
     
         1 . A composite spinneret that discharges a composite polymer flow constituted of a first component polymer and a second component polymer,
 wherein the composite spinneret comprises a measurement plate having a plurality of measurement holes for measuring each polymer component, one or more distribution plates having distribution holes for distributing each polymer component, and a discharge plate,   in a lowermost layer on a downstream side of the distribution plate in a polymer spinning path direction, a polymer distribution hole group in which a plurality of first component polymer distribution holes of semicircular arrangement are surrounded by a plurality of second component polymer distribution holes is bored,   at least a part of the second component polymer distribution holes in the polymer distribution hole group is arranged in semicircular arc arrangement on an outer side of a circumferential portion of the plurality of first component polymer distribution holes of semicircular arrangement, and   the total number of holes Ht of the second component polymer distribution holes in the polymer distribution hole group and the number of holes Ho of the second component polymer distribution holes arranged in semicircular arc arrangement on the outer side of the circumferential portion of the plurality of first component polymer distribution holes of semicircular arrangement satisfy relationship (1):   
       
         
           
             
               
                 
                   
                     
                       1 
                       / 
                       16 
                     
                     < 
                     
                       Ho 
                       / 
                       Ht 
                     
                     < 
                     
                       1 
                       / 
                       4. 
                     
                   
                 
                 
                   
                     ( 
                     1 
                     ) 
                   
                 
               
             
           
         
       
     
     
         2 . A method of manufacturing a composite fiber using the composite spinneret according to  claim 1 .