초록 ▼

The low-shrinkage hybrid yarns comprise reinforcing filaments and matrix filaments composed of thermoplastic polymers having a lower melting point than the melting or decomposition point of the reinforcing filaments. The yarns are characterized by a 160.degree. C. hot air shrinkage of not more than

The low-shrinkage hybrid yarns comprise reinforcing filaments and matrix filaments composed of thermoplastic polymers having a lower melting point than the melting or decomposition point of the reinforcing filaments. The yarns are characterized by a 160.degree. C. hot air shrinkage of not more than 2% and a 200.degree. C. hot air shrinkage of not more than 5%. A process for producing these hybrid yarns includes the steps of feeding yarn strands moving at different speeds into an entangling jet, heating a matrix feed yarn during the feeding thereof into the entangling jet, entangling the feed yarn strands, and taking off the strands with or without shrinkage and additional heating.

대표청구항 ▼

[ What is claimed is:] [1.] 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 reinfor

[ What is claimed is:] [1.] 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.