Slide fastener tape

Abstract

At least part of constituent yarns extending in the warp direction outside and adjacent a core thread woven or knitted in an element attachment edge portion has a higher elongation recovery ratio R than all the other constituent yarns and the core threads extending in the warp direction, the elongation recovery ratio R being expressed by the following equation based on a measurement according to JIS L1096: R ={( L 1 −L 2)/( L 1 −L 0)}×100  (1) where L0 is an original length of yarn, L1 is a length of yarn when pulled under a predetermined tension and L2 is a length of yarn after the elongation is recovered under no tension. After elements are mounted, this fastener tape is formed to have a positive pucker condition in which its element attachment edge portion is dented and curved while its tape main body is slightly waved. Consequently, it is possible to construct a woven/knitted fastener stringer capable of securing linearity after this fastener tape is sewed to object clothes.

What is claimed is:  
     
         1 . A slide fastener tape comprising: a tape main body formed by weaving or knitting; and an element attachment edge portion in which a core thread is woven or knitted, 
 wherein at least part of constituent yarns extending in a warp direction outside and adjacent the core thread in the element attachment edge portion has a higher elongation recovery ratio R, which is expressed by a following equation (1) based on a length of yarn measured according to JIS L1096, than that of all other constituent yarns and the core threads extending in the warp direction in the tape main body:      R ={( L 1 −L 2)/( L 1 −L 0)}×100  (1)    where L0 is an original length of yarn, L1 is a length of yarn when pulled under a predetermined tension and L2 is a length of yarn when no tension is applied.    
     
     
         2 . The slide fastener tape according to  claim 1 , wherein the elongation recovery ratio R of the yarns having the high elongation recovery ratio R is 85% or more.  
     
     
         3 . The slide fastener tape according to  claim 1  or  2 , wherein the elongation recovery ratio R is set to be smaller in an order of the constituent yarns extending in the warp direction outside and adjacent the core thread in the element attachment edge portion, the core threads and all the other constituent yarns extending in the warp direction.  
     
     
         4 . The slide fastener tape according to  claim 2  or  3 , wherein a size of the yarns having the high elongation recovery ratio R is set to be larger than that of a single yarn of the constituent yarns extending in the warp direction of the tape main body.  
     
     
         5 . The slide fastener tape according to  claim 1 , wherein the yarns having the high elongation recovery ratio R are composed of nylon-made multi-filament yarn while all the other constituent yarns extending in the warp direction are composed of polyester-made multi-filament yarn.  
     
     
         6 . The slide fastener tape according to  claim 3 , wherein the yarns having the high elongation recovery ratio R are multi-filament yarn composed of polycondensate of n-propanediol and terephthalic acid while all the other constituent yarns extending in the warp direction are polyester-made multi-filament yarn.