Fiber Guide Channel For An Open End Spinning Device And A Method For Producing A Fiber Guide Channel

Abstract

The invention relates to a fiber guide channel for an open-end spinning device and to a method for producing such a fiber guide channel. Fiber guide channels are known per se and serve for the pneumatic transport of individual fibers which are combed out of a feed fiber assembly by an opening cylinder that rotates in an opening cylinder housing, to a spinning rotor running at high speed in a rotor housing that can be subjected to a negative pressure. According to the invention, the fiber guide channel ( 13 ) is configured as a hollow body whose internal diameter decreases towards its orifice ( 26 ). The fiber guide channel ( 13 ) is produced according to a method of manufacturing wherein a first over-sized blank shape is produced by injection molding from a mixture of a sinterable material and a binder. Said blank is converted to a porous intermediate shape by removing the binder and brought into a final shape which requires little finishing by sintering.

1 . Fiber guide channel for an open end spinning device, for the pneumatic transportation of individual fibers, which are combed out of a feed fiber band by an opening cylinder rotating in an opening cylinder housing, to a spinning rotor running at a high speed in a rotor housing that can be subjected to a negative pressure, characterized in that the fiber guide channel ( 13 ) is configured as a hollow body, the internal cross-section of which decreases toward its orifice ( 26 ), the fiber fibre guide channel ( 13 ) being produced at least partially by a manufacturing method, in which a first over-sized blank shape is initially produced by injection molding from a mixture of a sinterable material and a binder and is converted into a porous intermediate shape by removing the binder and brought into a final shape which requires little finishing by sintering.  
   
   
       2 . Fiber guide channel according to  claim 1 , characterized in that a metal powder is used as the sinterable material.  
   
   
       3 . Fiber guide channel according to  claim 1 , characterized in that an oxide ceramic powder is used as the sinterable material and is processed with the binder to form pellets.  
   
   
       4 . Method for producing a fiber guide channel for an open end spinning device, for the pneumatic transportation of individual fibers, which are combed out of a feed fiber band by an opening cylinder rotating in an opening cylinder housing, to a spinning rotor running at a high speed in a rotor housing that can be subjected to a negative pressure, characterised in that the fiber guide channel ( 13 ) is produced at least partially by the following method steps, producing a mixture from a sinterable material and a binder, producing a blank body from this mixture by powder injection molding, releasing the blank body from its binder portions and hardening the porous blank body by sintering into its final shape.  
   
   
       5 . Method according to  claim 4 , characterized in that the inner contour of the fiber guide channel can be influenced by targeted mass concentration at the outer periphery.  
   
   
       6 . Method according to  claim 4 , characterized in that the surface structure of the fiber guide channel can be influenced by the material of the sinterable material, the grain size of the material and the binder removal and sintering parameters.  
   
   
       7 . Method according to  claim 4 , characterized in that at least one insertion piece ( 27 ) arranged in the region of an inlet opening ( 18 ) of the fiber guide channel is manufactured by the above method steps.  
   
   
       8 . Method according to  claim 4 , characterized in that the fiber guide channel ( 13 ) can be subjected to a heat treatment (for example nitration, boration, etc.).  
   
   
       9 . Method according to any one of the preceding claims, characterized in that the surface of the fiber guide channel ( 13 ) that comes into contact with the individual fibers, is coated.