Patent ID: 6109016
Filing Date: 2000-08-29
Classification: D02G,D02J,D10B,Y10S,Y10T

Abstract:
A process for producing a low-shrinkage hybrid yarn which comprises the measures ofa) feeding two or more feed yarn strands moving at different speeds into an entangling jet, at least a portion of the feed yarn strands forming a reinforcing feed yarn consisting of reinforcing filaments and a further portion of the feed yarn strands forming a matrix feed yarn consisting of matrix filaments composed of thermoplastic polymers having a 200.degree. C. hot air shrinkage of more than 20% and a melting point which is at least 30.degree. C. below the melting point of the reinforcing filaments,b) heating the matrix feed yarn during the feeding into the entangling jet to such a temperature that the shrinkage or at least a portion of the shrinkage is released,c) entangling the reinforcing feed yarn and the matrix feed yarn in the entangling jet under such conditions that a primary hybrid yarn is formed, andd) taking off the resulting primary hybrid yarn with or without shrinkage and additional heating.