Spinning apparatus

Abstract

A spinning apparatus for extruding a group of filaments by means of an annular spinneret. An annular collection chamber is arranged upstream of the spinneret, which is provided with a plurality of nozzle bores. The collection chamber has an upper inlet area and a lower annular outlet area, which is connected to the upper inlet area. In the inlet area of the collection chamber a filter device is disposed, upstream of which is a melt feed. The inlet area of the collection chamber is formed by a plurality of filter chambers, which are each provided with a melt inlet and a melt outlet. The filter device has a plurality of substantially cylindrical filter elements, which are each provided with a powdered filter medium. One of these filter elements is assigned to each filter chamber. This ensures a large filtration area and deep bed filtration of the polymer melt.

What is claimed is:  
     
         1 . Spinning apparatus for extruding a group of filaments comprising: 
 an annular spinneret comprising a plurality of nozzle bores;    an annular collection chamber arranged upstream of the spinneret comprising: 
 an upper inlet area; and  
 a lower annular outlet area connected to the upper inlet area;  
   a filter device arranged in the inlet area of the collection chamber; and    a melt feed arranged upstream of the filter device;    wherein the inlet area of the collection chamber is formed by a plurality of filter chambers each having a melt inlet and a melt outlet;    wherein the filter device comprises a plurality of substantially cylindrical filter elements which each comprise a powdered filter medium; and    wherein each one of the filter elements is assigned to one of the filter chambers.    
     
     
         2 . Spinning apparatus as claimed in  claim 1:   wherein the filter elements are each formed as a hollow cylinder with an outlet opening that is connected to the melt outlet of the filter chamber;    wherein the filter elements each have a filter shell comprising the powdered filter medium through which melt flows from the outside toward the inside; and    wherein a space is formed between the filter shell of the filter element and the filter chamber.    
     
     
         3 . Spinning apparatus as claimed in  claim 2:   wherein the filter shell is formed by an inner tube that is open toward the outlet opening and an outer tube that encloses the inner tube;    wherein a closed shell casing exists between the inner tube and the outer tube to receive the powdered filter medium; and    wherein the inner tube and the outer tube each have a plurality of passages.    
     
     
         4 . Spinning apparatus as claimed in  claim 1 , wherein the powdered filter material is a sand or a metal powder.  
     
     
         5 . Spinning apparatus as claimed in  claim 1 , wherein the filter chambers are annularly spaced apart from one another within the inlet area and wherein the melt outlets of the filter chambers open directly into the outlet area of the collection chamber.  
     
     
         6 . Spinning apparatus as claimed in  claim 1 , wherein the melt inlets of the filter chambers are connected to the melt feed by a plurality of distribution lines.  
     
     
         7 . Spinning apparatus as claimed in  claim 1 , wherein the melt inlets of the filter chambers are connected to the melt feed by an annular distribution channel.  
     
     
         8 . Spinning apparatus as claimed in  claim 1 , wherein an annular perforated plate is arranged upstream of the spinneret within the outlet area.  
     
     
         9 . Spinning apparatus as claimed in  claim 1 , wherein the spinneret and the filter device are held by an annular carrier and wherein a heating element is arranged on the inside of the carrier.  
     
     
         10 . Spinning apparatus as claimed in  claim 9 , wherein the heating element is an electric heater band.  
     
     
         11 . Spinning apparatus as claimed in  claim 9 , wherein the carrier is connected to a heating box such that a shell of the carrier and an upper end face of the carrier can be heated by a heat transfer fluid.