Patent ID: 8834762
Filing Date: 2014-09-16
Classification: B01D,D01D,D04H,Y10T

Abstract:
1. A method of producing a pleatable nonwoven fabric, comprising melting and pressing a polymer through a respective spinnerets of first and second spinning beams to produce polymer threads, and laying down the polymer threads thus produced on a conveyor belt to form a nonwoven layer, wherein spinnerets of different diameters are used and thicker and thinner polymer threads are simultaneously produced and are laid down in a single step, the diameter of the spinnerets for the thinner threads being <0.2 mm and >0.2 mm for the thicker threads, with high-viscosity polymer melts being used with a melt flow index “mfi” of below 500, wherein the first spinning beam comprises spinnerets of a first diameter and the second spinning beam comprises spinnerets of a second diameter smaller than the first diameter, and wherein the first and second spinning beams are disposed at an acute angle (β) with respect to each other.