Method and false twist spindle for false twist texturing

Abstract

A yarn processing method is proposed for manufacturing a fancy yarn from at least one filament yarn comprising the process steps of supplying the filament yarn into a false twist texturing unit and producing twists of the filament yarn with a twist density by transferring an axial torque to the filament yarn by means of a false twist spindle of the false twist texturing unit as well as a false twist spindle and a yarn processing machine for implementing the method. According to the invention, the process fluctuations influencing the twist density are compensated by keeping the transferred torque constant.

1 - 8 . (canceled)  
   
   
       9 . A yarn processing method for manufacturing a fancy yarn from at least one filament yarn comprising: 
 supplying a filament yarn into a false twist texturing unit having a false twist spindle;    producing twists of the filament yarn with a twist density by transferring an axial torque to the filament yarn by means of the false twist spindle; and    compensating process fluctuations which influence the twist density by keeping the transferred torque constant.    
   
   
       10 . The yarn processing method according to  claim 9 , wherein the transferred torque is implemented by controlling power consumption of an electric motor driving the false twist spindle and wherein the electric current intensity of the electric current flowing through the electric motor at constant voltage is kept constant.  
   
   
       11 . The yarn processing method according to  claim 9 , wherein the transferred torque is measured by means of a torque sensor and a speed of rotation of the false twist spindle is controlled such that the torque is kept constant.  
   
   
       12 . A false twisting texture unit comprising: 
 a false twist spindle for transferring an axial torque to a filament yarn in order to produce twists of the filament yarn with a twist density; and    constant holding means for keeping the transferred torque constant in order to compensate for process fluctuations influencing the twist density.    
   
   
       13 . The texturing unit according to  claim 12  wherein the false twist spindle comprises a disk friction unit.  
   
   
       14 . The unit according to claims  12  wherein the false twist spindle comprises a nip twister.  
   
   
       15 . The unit according to  claim 12  wherein the false twist spindle has an electric drive motor and wherein the constant holding means is operative for keeping constant the power consumption of the electric motor by keeping constant the electric current flowing through the electric motor at constant voltage.  
   
   
       16 . The texturing unit according to  claim 12  wherein the constant holding means comprises a torque sensor for measuring the transferred torque in order to control a rotation speed of the false twist spindle so that the torque is kept constant.  
   
   
       17 . A yarn processing machine comprising: 
 at least one false twist texturing unit, each texturing unit comprising: 
 a false twist spindle for transferring an axial torque to a filament yarn in order to produce twists of the filament yarn with a twist density; and  
 constant holding means for keeping the transferred torque constant in order to compensate for processing fluctuations influencing the twist density.