Method, basic structure, and paper machine clothing

Abstract

A method for thermally fixing a seam loop of a basic structure for a paper machine clothing, such as a seam felt of a paper machine. A flat fabric is provided with longitudinal threads and transverse threads. The flat fabric may have passed through a first thermal fixing process. The flat fabric is folded at at least one folding point to form a two-ply structure and to form a seam loop at the folding point. An electrically conductive pintle wire is inserted into the seam loop and the electrically conductive wire is heated by applying a voltage for thermally fixing the seam loop and for improving a structure of the seam loop.

1 . A method for heat setting a seam loop for a basic structure of a clothing, the method comprising the following steps:
 a) providing a flat fabric formed with longitudinal threads and transverse threads, the flat fabric having passed through a first heat setting process;   b) folding the flat fabric at at least one folding point to form a two-ply structure and to form a seam loop at the at least one folding point;   c) inserting a pintle wire into the seam loop, the pintle wire being an electrically conductive pintle wire; and   d) heating the electrically conductive pintle wire by applying an electrical voltage and thereby heat-setting and improving a structure of the seam loop.   
     
     
         2 . The method according to  claim 1 , wherein steps b) to d) comprise:
 folding the flat fabric at two folding points to form a two-ply structure and forming two seam loops at the two folding points, and connecting two end edges of the flat fabric to one another;   guiding the two seam loops one inside another and connecting the seam loops by inserting a pintle wire while forming a two-ply fabric loop, and simultaneously heat setting the two seam loops.   
     
     
         3 . The method according to  claim 1 , which comprises forming the at least one folding point by removing a majority of mutually adjacent transverse threads in an area of the folding point. 
     
     
         4 . The method according to  claim 3 , which comprises carrying out the step of removing the mutually adjacent transverse threads between step a) and step b). 
     
     
         5 . The method according to  claim 1 , wherein the electrically conductive pintle wire is a monowire. 
     
     
         6 . The method according to  claim 5 , wherein the monowire has a circular cross section. 
     
     
         7 . The method according to  claim 1 , wherein the electrically conductive pintle wire is a twine or a woven structure made up of multiple yarns. 
     
     
         8 . The method according to  claim 7 , wherein said twine or said woven structure is exclusively formed from electrically conductive yarns. 
     
     
         9 . The method according to  claim 7 , wherein said twine or said woven structure consists of a combination of electrically conductive yarns and non-electrically conductive yarns. 
     
     
         10 . The method according to  claim 1 , wherein the electrically conductive pintle wire is a metallic pintle wire. 
     
     
         11 . The method according to  claim 1 , wherein the electrically conductive pintle wire is a polymer wire, which is made conductive by introducing particles or by coating. 
     
     
         12 . The method according to  claim 1 , which comprises determining a temperature of at least one of the electrically conductive pintle wire or the seam loops with at least one sensor. 
     
     
         13 . The method according to  claim 12 , which comprises using temperature values determined by the at least one sensor for regulating an electrical voltage across the pintle wire. 
     
     
         14 . The method according to  claim 1 , which comprises producing a seam felt of a paper machine. 
     
     
         15 . A basic structure for a clothing, wherein the basic structure has been produced by the method according to  claim 1 . 
     
     
         16 . The basic structure according to  claim 15 , wherein the clothing is a seam felt of a paper machine. 
     
     
         17 . A clothing, comprising a basic structure produced by the method according to  claim 1 . 
     
     
         18 . The clothing according to  claim 17 , configured as a seam felt for a paper machine.