Multiple string for a ball game racket

Abstract

The present disclosure relates to a string for a ball game racket including at least two parallel filaments, wherein only portions of the filaments are interconnected. Moreover, the disclosure relates to method of producing such a string. A first method includes the steps of providing at least two string filaments, bringing the string filaments together into a parallel configuration and combining portions of the string filaments. An alternative production method includes the steps of providing a string and slitting portions of the string so as to produce at least two parallel filaments of the string, only portions of which are interconnected.

1 . A string for a ball game racket, comprising at least two parallel filaments, wherein only portions of the filaments are interconnected. 
     
     
         2 . The string according to  claim 1  wherein the filaments are of the same type. 
     
     
         3 . The string according to  claim 1 , wherein the filaments have different diameters and/or qualities. 
     
     
         4 . The string according to  claim 1 , wherein the interconnected portions of the filaments and unconnected portions of the filaments follow each other, wherein a longitudinal proportion of the interconnected portions of the filaments with respect to an entire length of the string is between 10% and 80%. 
     
     
         5 . The string according to  claim 1 , wherein the interconnected portions of the filaments are permanently interconnected in a longitudinal direction via their outer surfaces. 
     
     
         6 . The string according to  claim 1 , wherein the interconnected portions of the filaments have a length between 20 mm and 200 mm. 
     
     
         7 . The string according to  claim 1 , wherein unconnected portions of the filaments have a length between 50 mm and 250 mm. 
     
     
         8 . The string according to  claim 1 , wherein the filaments have a diameter of 0.5 mm to 1 mm. 
     
     
         9 . A method of producing a string for a ball game racket, comprising the steps of:
 a) providing at least two string filaments;   b) bringing the string filaments together to form a parallel configuration; and   c) connecting portions of the string filaments.   
     
     
         10 . The method according to  claim 9 , wherein before being brought together the string filaments are coated. 
     
     
         11 . The method according to  claim 9 , wherein the portions of the string filaments are connected using elevated temperature, ultraviolet light, and/or laser light. 
     
     
         12 . A method of producing a string for a ball game racket, comprising the steps of:
 a) providing a string; and   b) slitting portions of the string so as to produce at least two parallel filaments of the string, only portions of which are interconnected.   
     
     
         13 . The string according to  claim 1 , wherein a longitudinal proportion of the interconnected portions of the filaments with respect to an entire length of the string is between 25% and 60%. 
     
     
         14 . The string according to  claim 1 , wherein a longitudinal proportion of the interconnected portions of the filaments with respect to an entire length of the string is between 35% and 50%. 
     
     
         15 . The string according to  claim 2 , wherein the interconnected portions of the filaments are permanently interconnected in a longitudinal direction via their outer surfaces. 
     
     
         16 . The string according to  claim 3 , wherein the interconnected portions of the filaments are permanently interconnected in a longitudinal direction via their outer surfaces. 
     
     
         17 . The string according to  claim 1 , wherein the interconnected portions of the filaments have a length between 80 mm and 120 mm. 
     
     
         18 . The string according to  claim 1 , wherein unconnected portions of the filaments have a length between 130 mm and 170 mm. 
     
     
         19 . The string according to  claim 1 , wherein the filaments have a diameter of 0.65 mm to 0.8 mm. 
     
     
         20 . The method according to  claim 10 , wherein the portions of the string filaments are connected using elevated temperature, ultraviolet light, and/or laser light.