Fastener tape and method for manufacturing same, and fastener stringer

Abstract

Core portion is arranged in a side-edge portion of a fastener tape to which fastener elements are to be attached. The core portion includes at least one core thread and a tubular portion that encloses the at least one core thread. The at least one core thread includes a crimpable thread that is crimped in accordance with a difference in thermal shrinkage ratio between different polymer materials.

1 . A fastener tape comprising:
 a fastener tape having a side-edge portion to which fastener elements are to be attached; and   a core portion arranged in the side-edge portion, wherein   the core portion includes at least one core thread and a tubular portion that encloses the at least one core thread,   the at least one core thread includes a crimpable thread that is crimped in accordance with a difference in thermal shrinkage ratio between different polymer materials.   
     
     
         2 . The fastener tape of  claim 1 , wherein the core portion includes total N (N indicates a natural number of 2 or more) core threads as said at least one core thread, and each of the total N core threads is the crimpable thread. 
     
     
         3 . The fastener tape of  claim 1 , wherein the crimpable thread is a composite thread of bonded filaments of at least two types of polymer materials having different thermal shrinkage ratios. 
     
     
         4 . The fastener tape of  claim 1 , wherein the crimpable thread is a composite thread including at least two types of polymer materials spun together and having different thermal shrinkage ratios. 
     
     
         5 . The fastener tape of  claim 1 , wherein the crimpable thread is crimped like a helix and/or wave. 
     
     
         6 . The fastener tape of  claim 1 , wherein the core portion is a core yarn being woven in the fastener tape. 
     
     
         7 . The fastener tape of  claim 1 , wherein the tubular portion includes a knitted structure of knitted plural skin threads. 
     
     
         8 . The fastener tape of  claim 1 , wherein except for said at least one core thread, no crimpable thread is included which is crimped in accordance with a difference in thermal shrinkage ratio between different polymer materials. 
     
     
         9 . A fastener stringer comprising:
 the fastener tape of  claim 1 ; and   the fastener elements attached to the side-edge portion of the fastener tape.   
     
     
         10 . A method for manufacturing a fastener tape comprising:
 configuring a fastener tape provided with a core portion arranged in one side-edge portion thereof, the core portion including at least one core thread and a tubular portion that encloses the at least one core thread, and the at least one core thread including a crimpable thread that is crimped in accordance with a difference in thermal shrinkage ratio between different polymer materials; and   heating the fastener tape to allow the crimpable thread to crimp.   
     
     
         11 . The method for manufacturing a fastener tape of  claim 10  further comprising: after said heating the fastener tape, stretching the fastener tape along its longitudinal direction so as to lower a degree of crimp of the crimpable thread. 
     
     
         12 . The method for manufacturing a fastener tape of  claim 11 , wherein the fastener tape runs in a passage defined by plural rollers while a tension is applied thereto in the longitudinal direction, and is thereby stretched. 
     
     
         13 . The method for manufacturing a fastener tape of  claim 11  further comprising: after said stretching the fastener tape, reheating the fastener tape so as to increase the degree of crimp of the crimpable thread. 
     
     
         14 . The method for manufacturing a fastener tape of  claim 13  further comprising: dyeing the fastener tape, said reheating the fastener tape is conducted by heating and drying the fastener tape. 
     
     
         15 . The method for manufacturing a fastener tape of  claim 10  wherein after said heating the fastener tape, at least one process of lowing a degree of crimp of the crimpable thread and at least one process of increasing the degree of crimp of the crimpable thread are conducted simultaneously or in this order. 
     
     
         16 . The fastener tape of  claim 1 , wherein the core portion includes total N (N indicates a natural number of 2 or more) core threads as said at least one core thread, and each of the total N core threads is the crimpable thread, the crimpable thread being a composite thread of bonded filaments of at least two types of polymer materials having different thermal shrinkage ratios. 
     
     
         17 . The fastener tape of  claim 16 , wherein the crimpable thread is a composite thread including at least two types of polymer materials spun together and having different thermal shrinkage ratios. 
     
     
         18 . The fastener tape of  claim 16 , wherein the crimpable thread is crimped like a helix and/or wave. 
     
     
         19 . The fastener tape of  claim 16 , wherein the core portion is a core yarn being woven in the fastener tape. 
     
     
         20 . The fastener tape of  claim 16 , wherein the tubular portion includes a knitted structure of knitted plural skin threads.