Electrically Conductive Elastic Composite Yarn

Abstract

An electrically conductive elastic composite yarn comprises at least one elastic member having a ratio N being drafted length Ld over relaxed length Lr1 N being in the ränge of 1 to 10. The yarn further comprises more than one metal filament wrapped around the elastic member. The yarn is characterized in that each of the metal filaments is twisted with at least one other of the metal filaments.

1 . An electrically conductive elastic composite yarn comprising at least one elastic member having a ratio N being drafted length Ld over relaxed length Lr, said N being in the range of 1 to 10, said yarn further comprising more than one metal filament wrapped around said at least one elastic member, said metal filament having a length that is equal to or greater than the drafted length Ld, characterized in that each of said metal filaments is twisted with at least one other of said filaments. 
   
   
       2 . An electrically conductive elastic composite yarn as in  claim 1 , wherein said metal filaments are wrapped around said at least one elastic member using a number of turns per meter of said yarn in the range of 150 turns per meter to 1400 turns per meter. 
   
   
       3 . An electrically conductive elastic composite yarn as in  claim 1 , wherein said metal filaments are twisted in a direction of twist, said filaments are wrapped around said at least one elastic element in the opposite direction of said direction of twist. 
   
   
       4 . An electrically conductive elastic composite yarn as in  claim 1 , wherein said yarn comprising at least a first group of metal filaments being twisted with each other and a second group of metal filaments being twisted with each other, said first group and said second group being wrapped around said at least one elastic member. 
   
   
       5 . An electrically conductive elastic composite yarn as in  claim 1 , wherein said yarn comprising more than 2 groups of metal filaments being twisted with each other. 
   
   
       6 . An electrically conductive elastic composite yarn as in  claim 4 , wherein said first group is wrapped around said at least one elastic element in S-direction, said second group being wrapped around said at least one elastic member in Z-direction. 
   
   
       7 . An electrically conductive elastic composite yarn as in  claim 4 , wherein the number of groups being wrapped around said at least one elastic member in S-direction is equal to number of groups being wrapped around said at least one elastic member in Z-direction. 
   
   
       8 . An electrically conductive elastic composite yarn as in  claim 4 , wherein each of said groups comprises a number of metal filaments M, said M being equal or more than 2, said M being less or equal to 550 
   
   
       9 . An electrically conductive elastic composite yarn as in  claim 8 , wherein said M is identical number for each of said groups of metal filaments. 
   
   
       10 . An electrically conductive elastic composite yarn as in  claim 1 , wherein said yarn comprises 1000 or less metal filaments. 
   
   
       11 . An electrically conductive elastic composite yarn as in  claim 1 , wherein each of said metal filaments are twisted with at least one other of said filaments using between 10 and 200 turns per meter. 
   
   
       12 . An electrically conductive elastic composite yarn as in  claim 1 , wherein for each section of the yarn having a relaxed length S, the shortest of said metal filaments in said section having a length F, said F being equal or larger than S, said F being less or equal than 5*S. 
   
   
       13 . An electrically conductive elastic composite yarn as in  claim 1 , wherein for each section of the yarn having a relaxed length S, the length of each of said metal filaments is less or equal than 3*S. 
   
   
       14 . An electrically conductive elastic composite yarn as in  claim 1 , wherein said N being in the range of 1.5 to 5. 
   
   
       15 . An electrically conductive elastic composite yarn as in  claim 1 , wherein said at least one elastic element being a polyurethane member of a natural or artificial rubber member. 
   
   
       16 . An electrically conductive elastic composite yarn as in  claim 1 , wherein each of said metal filaments have an equivalent diameter D, said D being equal or more than 1 μm, said D being less or equal to 150 μm. 
   
   
       17 . An electrically conductive elastic composite yarn as in  claim 1 , wherein each of said metal filaments is provided by metal fiber bundle drawing operation. 
   
   
       18 . An electrically conductive elastic composite yarn as in  claim 1 , wherein each of said metal filaments comprises copper or copper-alloy, steel, nickel or nickel-alloy, aluminium or aluminium-alloy or stainless steel. 
   
   
       19 . A textile product comprising at least one electrically conductive elastic composite yarn as in  claim 1 . 
   
   
       20 . A textile product as in  claim 19 , wherein said textile product is a woven fabric. 
   
   
       21 . A textile product as in  claim 20 , wherein said yarn is present as a weft or warp yarn. 
   
   
       22 . A textile product as in  claim 19 , wherein said textile product having an elongation at rupture of 100% to 400%. 
   
   
       23 . A garment comprising a textile product as in  claim 19 . 
   
   
       24 . A garment as in  claim 23 , wherein said yarn is present as a loop. 
   
   
       25 . A garment as in  claim 23 , wherein said garment being a seat upholstery. 
   
   
       26 . An electrically heating device comprising at least one electrically conductive elastic composite yarn as in  claim 1 . 
   
   
       27 . An electrically heating device comprising a textile product as in  claim 19 . 
   
   
       28 . The use of an electrically conductive elastic composite yarn as in  claim 1  as an antenna. 
   
   
       29 . The use of an electrically conductive elastic composite yarn as in  claim 1  as a resistive heating element. 
   
   
       30 . The use of a textile product as in  claim 19 , wherein said yarn being used as an antenna. 
   
   
       31 . The use of a textile product as in  claim 30 , wherein said yarn being present as a loop-antenna. 
   
   
       32 . The use of a textile product as in  claim 19 , wherein said yarn being used as a resistive heating element. 
   
   
       33 . The use of a garment as in  claim 23 , wherein said yarn being used as an antenna. 
   
   
       34 . The use of a garment as in  claim 33 , wherein said yarn being present as a loop-antenna. 
   
   
       35 . The use of a garment as in  claim 23 , wherein said yarn being used as a resistive heating element. 
   
   
       36 . The use of a garment as in  claim 33 , wherein said garment being a seat upholstery.