Webbing for seat belt

Abstract

A webbing can be used in a passenger restraint belt. The webbing includes warp yarns and wefts comprising synthetic filaments and woven so as to extend orthogonally to each other. At least one of the warp yarns and the weft yarns are formed using synthetic filaments comprising first filaments and second filaments in which the second filaments are provided in the first filaments and have a melting temperature lower than that of the first filaments. The synthetic filaments are middle shrinking synthetic filaments which are contracted at a dimensional shrinkage rate of 15% to 20% after the second filaments are melted under conditions of 150° C. or more for 180 seconds or more. The webbing has a weight of 60 g/m or less, a tensile strength of 25 kN or more, and a retention rate after hexagonal bar abrasion of 70% or more.

1 . A webbing for a passenger restraint belt, comprising:
 warp yarns and weft yarns comprising synthetic filaments and woven so as to extend orthogonally to each other,   wherein at least one of the warp yarns and the weft yarns are formed using synthetic filaments comprising first filaments and second filaments,   wherein the second filaments are provided in the first filaments and have a melting temperature lower than that of the first filaments,   wherein the synthetic filaments are middle shrinking synthetic filaments which are contracted at a dimensional shrinkage rate of 15% to 20% after the second filaments are melted under conditions of 150° C. or more for 180 seconds or more, and   wherein the webbing has a weight of 60 g/m or less, a tensile strength of 25 kN or more, and a retention rate after hexagonal bar abrasion of 70% or more.   
   
   
       2 . The webbing for a passenger restraint belt according to  claim 1 , wherein the weft density is 20 picks per inch or less. 
   
   
       3 . The webbing for a passenger restraint belt according to  claim 2 , wherein the weft density is 17 picks per inch or less. 
   
   
       4 . The webbing for a passenger restraint belt according to  claim 1 , wherein at least one of the warp yarns and the weft yarns are formed using a filament yarn material made of twist yarns or a filament yarn material made of entangled non-twist yarns. 
   
   
       5 . The webbing for a passenger restraint belt according to  claim 4 , wherein both the warp yarns and the weft yarns are formed using a filament yarn material made of twist yarns or a filament yarn material made of entangled non-twist yarns. 
   
   
       6 . The webbing for a passenger restraint belt according to  claim 1 , wherein both the warp yarns and the weft yarns arc formed using the synthetic filaments comprising the first filaments and the second filaments. 
   
   
       7 . The webbing for a passenger restraint belt according to  claim 1 , wherein the first filaments comprise polyethylene terephthalate. 
   
   
       8 . The webbing for a passenger restraint belt according to  claim 1 , wherein the second filaments comprise polyethylene terephthalate and polyethylene isophthalate. 
   
   
       9 . The webbing for a passenger restraint belt according to  claim 1 , wherein the first filaments comprise high-melting-point polyester filaments and the second filaments comprise low-melting-point polyester filaments. 
   
   
       10 . A seat belt for restraining a passenger, comprising:
 a webbing, wherein the webbing comprises warp yarns and weft yarns comprising synthetic filaments and woven so as to extend orthogonally to each other,   wherein at least one of the warp yarns and the weft yarns are formed using synthetic filaments comprising first filaments and second filaments,   wherein the second filaments are provided in the first filaments and have a melting temperature lower than that of the first filaments,   wherein the synthetic filaments are middle shrinking synthetic filaments which are contracted at a dimensional shrinkage rate of 15% to 20% after the second filaments are melted under conditions of 150° C. or more for 180 seconds or more, and   wherein the webbing has a weight of 60 g/m or less, a tensile strength of 25 kN or more, and a retention rate after hexagonal bar abrasion of 70% or more.   
   
   
       11 . A seat belt device comprising:
 the seat belt comprising a webbing;   a seat belt retractor configured to retract and withdraw the scat belt;   a buckle configured to be fixed to a vehicle; and   a tongue provided for the seat belt and is engaged with the buckle when the seat belt is worn,   wherein the webbing comprises warp yarns and weft yarns comprising synthetic filaments and woven so as to extend orthogonally to each other,   wherein at least one of the warp yarns and the weft yarns are formed using synthetic filaments comprising first filaments and second filaments,   wherein the second filaments are provided in the first filaments and have a melting temperature lower than that of the first filaments,   wherein the synthetic filaments are middle shrinking synthetic filaments which are contracted at a dimensional shrinkage rate of 15% to 20% after the second filaments are melted under conditions of 150° C. or more for 180 seconds or more, and   wherein the webbing has a weight of 60 g/m or less, a tensile strength of 25 kN or more, and a retention rate after hexagonal bar abrasion of 70% or more.