Patent ID: 7435370
Filing Date: 2008-10-14
Classification: C08F,D01F,Y10T

Abstract:
1. A process for obtaining a fiber from a high-modulus, extrudable polyethylene, wherein said process comprises the steps of: a) providing a high modulus, extrudable polyethylene having tensile strength of at least 250 kgf/cm b) directing said polyethylene to an extruder in order to melt same and obtain an extrudate that is directed to a cooling bath to have its temperature reduced; c) directing said cooled extrudate to a first stretcher and stretching or drawing the cooled extrudate into a fiber, the stretching being carried out at a first velocity v d) directing the so-stretched fiber to a heating bath at a temperature of ca. 90° C.; and e) directing the so-stretched fiber, after heating, to a second stretcher, the stretching being carried out at a velocity v i) v ii) the draw ratio between the first stretcher and the second stretcher is from 2/1 up to 65/1; and f) recovering a fiber, wherein said fiber has linear density values in the range of 400-1700 denier and tenacity of at least 4 gf/den.