Modified cross-section fiber

Abstract

In particular, an object is to show a modified cross-section fiber that is split and used and thus can efficiently produce a fine conjugate fiber. The present disclosure relates to a modified cross-section fiber comprising: ( 1 ) a plurality of pieces of conjugate fiber structures comprising a first thermoplastic resin and a second thermoplastic resin having a lower melting or softening point than the first thermoplastic resin and ( 2 ) a connected body comprising a third thermoplastic resin having a higher melting or softening point than the second thermoplastic resin, wherein, in an arbitrary fiber cross-section, at least two pieces of the conjugated fiber structure are connected by the connected body.

1 . A modified cross-section fiber comprising:
 a plurality of pieces of conjugate fiber structures comprising a first thermoplastic resin and a second thermoplastic resin having a lower melting or softening point than the first thermoplastic resin and   a connected body comprising a third thermoplastic resin having a higher melting or softening point than the second thermoplastic resin,   wherein, in an arbitrary fiber cross-section, at least two pieces of the conjugated fiber structure are connected by the connected body.   
     
     
         2 . The modified cross-section fiber according to  claim 1 , wherein the connected body further comprises the second thermoplastic resin and has structure in which a periphery of the third thermoplastic resin is covered with the second thermoplastic resin. 
     
     
         3 . The modified cross-section fiber according to  claim 1 , wherein a cross-sectional shape of the conjugate fiber structure is circular or polygonal. 
     
     
         4 . The modified cross-section fiber according to  claim 1 , comprising 2 to 6 pieces of the conjugate fiber structures. 
     
     
         5 . The modified cross-section fiber according to  claim 1 , wherein the first thermoplastic resin and the third thermoplastic resin are the same resin. 
     
     
         6 . The modified cross-section fiber according to  claim 1 , wherein the second thermoplastic resin occupies a surface of the conjugate fiber structure excluding a connected portion with the connected body. 
     
     
         7 . The modified cross-section fiber according to  claim 2 , wherein the third thermoplastic resin occupies 20% or more of a cross-section of the connected body. 
     
     
         8 . The modified cross-section fiber according to  claim 2 , wherein the second thermoplastic resin comprised in the connected body, and the second thermoplastic resin comprised in the conjugate fiber structure are melted and united. 
     
     
         9 . The modified cross-section fiber according to  claim 1 , comprising structure in which three pieces of the conjugate fiber structures arranged at an equal interval around one piece of the conjugate fiber structure located in a center are connected to one piece of the conjugate fiber structure located in the center by the connected body, respectively. 
     
     
         10 . The modified cross-section fiber according to  claim 1 , wherein a length of a connected portion between the conjugate fiber structure and the connected body in the arbitrary fiber cross-section of the modified cross-section fiber is 65% or less of a peripheral length of the conjugate fiber structure, in a relationship between one piece of the conjugate fiber structure and one piece of the connected body connected therewith.