Artificial turf system

Abstract

An artificial turf system for installation over a receiving surface. The artificial turf system comprising: a sheet member made of a flexible material, the sheet member defining a first surface for interfacing with the receiving surface and a second surface; primary yarns made of straight fibers backstitched in and threaded through the sheet member and upwardly extending from the sheet member to a first elevation; and secondary yarns made of textured fibers backstitched in and threaded through the sheet member and upwardly extending from the sheet member at a second elevation less than the first elevation which is caused by a difference in texture between the primary yarns and the secondary yarns, wherein the secondary yarns are more rigid than the primary yarns, and wherein the primary yarns and the secondary yarns have ends which are cut after being threaded through the sheet member.

1 . An artificial turf system for installation over a receiving surface, the artificial turf system comprising:
 a sheet member made of a flexible material, the sheet member defining a first surface for interfacing with the receiving surface and a second surface;   primary yarns made of straight fibers backstitched in and threaded through the sheet member and upwardly extending from the second surface of the sheet member to a first elevation; and   secondary yarns made of textured fibers backstitched in and threaded through the sheet member and upwardly extending from the second surface of the sheet member at a second elevation less than the first elevation defining a difference in elevation which is caused by a difference in texture between the primary yarns and the secondary yarns, wherein the secondary yarns are more rigid than the primary yarns, and wherein the primary yarns and the secondary yarns have ends which are cut after being threaded through the sheet member.   
     
     
         2 . The artificial turf system of  claim 1 , wherein the material used for the primary yarns is not the same material which is used for the secondary yarns, wherein the material used for the secondary yarns is more rigid than the material used for the primary yarns. 
     
     
         3 . The artificial turf system of  claim 1 , wherein the secondary yarns are textured, and wherein the textured fibers comprise crimped fibers. 
     
     
         4 . The artificial turf system of  claim 1 , wherein the secondary yarns represent more than 50% in weight of the primary and secondary yarns together. 
     
     
         5 . The artificial turf system of  claim 1 , wherein combined yarns composed of the primary and secondary yarns are backstitched in parallel equally spaced apart rows on the sheet material. 
     
     
         6 . The artificial turf system of  claim 1 , wherein the mass of the secondary yarns is greater than the mass of the primary yarns. 
     
     
         7 . The artificial turf system of  claim 1 , wherein the mass of the secondary yarns is in a range between 15,001 and 20,000 deniers. 
     
     
         8 . The artificial turf system of  claim 1 , wherein the primary yarns and the secondary yarns have respectively a length, and wherein the length of secondary yarns is greater than the length of primary yarns. 
     
     
         9 . The artificial turf system of  claim 1 , wherein a ratio of the second elevation over the first elevation is smaller than 75%. 
     
     
         10 . An artificial turf system for installation over a receiving surface, the artificial turf system comprising:
 a sheet member made of a flexible material, the sheet member defining a first surface for interfacing with the receiving surface, and a second surface;   a plurality of primary yarns being backstitched to the sheet member at primary backstitches, with the primary yarns raising from the primary backstitches away from the second surface to a first elevation; and   a plurality of secondary yarns defining an underturf, the secondary yarns being backstitched to the sheet member at secondary backstitches,   wherein the secondary backstitches are distributed in-between the primary backstitches,   wherein the secondary yarns extend from the secondary backstitches up to a second elevation lower than the first elevation,   wherein the secondary yarns extend sideways in random directions, and   wherein the secondary yarns intertwine with other secondary yarns.   
     
     
         11 . The artificial turf system of  claim 10 , wherein the primary yarns comprise a lower section rising from the sheet member under the second elevation, and wherein the underturf provides a least partial support to the lower section of the primary yarns thereby impeding the lower section of the primary yarns from curving, bending or crooking. 
     
     
         12 . The artificial turf system of  claim 10 , wherein the primary yarns are made of straight fibers. 
     
     
         13 . The artificial turf system of  claim 10 , wherein the secondary yarns are made of curved fibers. 
     
     
         14 . The artificial turf system of  claim 10 , wherein the plurality of secondary yarns represents more than 50% in weight of the sum of the plurality of primary and secondary yarns together. 
     
     
         15 . The artificial turf system of  claim 10 , wherein the secondary yarns are more rigid than the primary yarns. 
     
     
         16 . The artificial turf system of  claim 10 , wherein the secondary yarns are textured, and wherein the textured fibers comprise crimped fibers. 
     
     
         17 . The artificial turf system of  claim 10 , wherein the primary yarns and the secondary yarns have respectively a length, and wherein the length of secondary yarns is greater than the length of primary yarns. 
     
     
         18 . The artificial turf system of  claim 10 , wherein a ratio of the second elevation over the first elevation is smaller than 75%. 
     
     
         19 . The artificial turf system of  claim 10 , wherein the primary yarns and the secondary yarns have respectively a width, and wherein the width of the primary yarns is greater than the width of the secondary yarns. 
     
     
         20 . The artificial turf system of  claim 10 , wherein the primary yarns and the secondary yarns have respectively a thickness, and wherein the thickness of the secondary yarns is equal or greater than the width of the primary yarns.