Spinnerets for making cut-resistant yarns

Abstract

The invention provides spinnerets for making yarns made of filaments of different average diameters.

1 . A spinneret for making a cut-resistant yarn, the spinneret comprising extrusion holes of a first, smaller average diameter and of a second, larger average diameter, wherein the first and second average diameters differ by a factor of at least 1.2. 
   
   
       2 . The spinneret of  claim 1 , comprising extrusion holes having two different average diameters, wherein the smaller extrusion holes have an average diameter of at or about 35-65 microns, the larger extrusion holes have an average diameter of at or about 60-90 microns. 
   
   
       3 . The spinneret of  claim 1 , comprising extrusion holes having three different average diameters, wherein the smallest extrusion holes have an average diameter of at or about 35-65 microns, the medium extrusion holes have an average diameter of at or about 64 to 80 microns, and the largest extrusion holes have an average diameter of at or about 75 to 90 microns. 
   
   
       4 . The spinneret of  claim 1 , comprising extrusion holes having two different average diameters, wherein the first plurality of extrusion holes represents at or about 40 to 80% by number of the extrusion holes in the spinneret. 
   
   
       5 . The spinneret of  claim 1 , comprising extrusion holes having three different average diameters, wherein the smallest extrusion holes make up at or about 30 to 45% by number of the extrusion holes in the spinneret, the medium filaments make up at or about 30 to 45% by number of the extrusion holes in the spinneret, and the largest extrusion holes make up at or about 15 to 35% by number of the extrusion holes in the spinneret. 
   
   
       6 . The spinneret of  claim 1 , comprising extrusion holes of two different average diameters, wherein the ratio of the average diameter of the larger extrusion holes to the average diameter of the smaller extrusion holes is between at or about 1.3-2.0. 
   
   
       7 . The spinneret of  claim 1 , comprising extrusion holes having a substantially circular shape. 
   
   
       8 . The spinneret of  claim 1 , comprising at or about 16% by number extrusion holes of at or about 76 micron diameter, at or about 42% by number extrusion holes of at or about 64 micron diameter, and at or about 42% by number extrusion holes of at or about 51 micron diameter. 
   
   
       9 . The spinneret of  claim 1 , comprising extrusion holes arranged concentrically, in which the smaller extrusion holes are arranged concentrically within the larger extrusion holes.