| 摘要 |
The present invention relates to two-component acrylic fibres and yarns and their process of preparation. They consist of two copolymers based on acrylonitrile, in which the proportion of plasticizing comonomer differs by between 4 and 15% and which contain a total number of milliequivalents of acid of at least 50 per kg of polymer; they comprise a mixture of monolaminar, bilaminar and multilaminar strands; they possess a crimp, the direction of which depends on the heat and/or mechanical treatments to which they have been subjected, component B, which contains the smaller proportion of plasticizing comonomer, being located on the inside of the helix formed by the filaments, after treatment, without tension, at a temperature which is below about 110 DEG C. and at least equal to ambient temperature, and being located on the outside of the helix after treatment under tension or after heat treatment at a temperature above 110 DEG C., and the contraction and the crimp spacing varying from one strand to the next and along one and the same strand. The yarns and fibres according to the invention can be used in all the known textile-converting techniques, namely stretch-breaking, converting, carding and the like. |
