Cooling device for cooling synthetic filaments

Abstract

In a cooling device for cooling synthetic filaments using a cooling medium, in particular for use in the spinning of multifilaments, at least one cooling shaft through which the filaments are passed, is arranged between an entry and exit for filaments. The cooling shaft comprises a seamless, electroformed support with passage-openings which are separated by dykes. In this way a uniform flow profile of the cooling medium is obtained in the cooling shaft and the filaments are subjected to a uniform cooling treatment.

What is claimed  
     
         1 . Cooling device for cooling synthetic filaments, in particular for use in tho spinning of multifilaments, which device comprises a housing with at least one inlet and at least one outlet for a cooling medium, and an entry for filaments which are to be cooled and an exit for cooled filaments, at least one cooling shaft being arranged between the entry and the exit, through which shaft the filaments are passed, and which cooling shaft is provided with openings allowing cooling medium to pass through, wherein the cooling shaft comprises a seamless, electroformed support with passage-openings which are separated by dykes.  
     
     
         2 . Cooling device according to  claim 1 , wherein the seamless, electroformed support is made from nickel.  
     
     
         3 . Cooling device according to  claim 1 , wherein the passage-openings which are separated by dykes are arranged in a regular pattern.  
     
     
         4 . Cooling device according to  claim 1 , wherein the seamless, electroformed support comprises a first zone in which there are passage-openings separated by dykes, and a second, uninterrupted zone which adjoins the first zone.  
     
     
         5 . Cooling device according to  claim 1 , wherein a displaceable sleeve is arranged inside the seamless, electroformed support.  
     
     
         6 . Seamless, electroformed support with passage-openings which are separated by dykes, suitable for use as a cooling shaft in the cooling device according to  claim 1 .  
     
     
         7 . Device for the production of synthetic filaments, in particular for the spinning of multifilaments, which device comprises an extrusion device for the extrusion of a molten polymer mass through openings in an extrusion head, and a cooling device for cooling extruded filaments, wherein the cooling device comprises a housing with at least one inlet and at least one outlet for a cooling medium, and an entry for filaments which are to be cooled and an exit for cooled filaments, at least one cooling shaft being arranged between the entry and the exit, through which shaft the filaments are passed, and which cooling shaft is provided with openings allowing cooling medium to pass through, wherein the cooling shaft comprises a seamless, electroformed support with passage-openings which are separated by dyke.  
     
     
         8 . Device according to  claim 7 , wherein the extrusion head is connected to the entry to the cooling device.  
     
     
         9 . Device according to  claim 7 , wherein the extrusion head comprises one or more spinnerets each spinneret being connected to a cooling shaft of the cooling device.  
     
     
         10 . Device according to  claim 7 , wherein the cooling device comprises two outlets for cooling medium, one of which is arranged in the vicinity of the entry end of the cooling shaft and the other of which is arranged in the vicinity of the exit end of the cooling shaft.