Highly elastic synthetic crimp yarn with low residual latent crimp and process for producing said yarn
AssigneeBayer Aktiengesellschaft
InventorsHelmut Ohse, Wolfgang Muller, Walter Hofmann, Jurgen Walther
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Abstract
The invention relates to a process for the production of a false-twist textured, highly elastic, synthetic crimp yarn with low residual shrinkage and latently bound crimp by stretching, false-twisting, heat-fixing and thermal after-treatment of the synthetic yarn at yarn draw-off rates of from 400 to 900 m/min, in which the thread tension during thermal after-treatment is 6-25% of the thread tension during heat-fixing, the time of thermal after-treatment is 2-5% of the time spent in heat-fixing and the temperature of the yarn during the thermal after-treatment is 30.degree.-100.degree. C.
Claims8
A process for the production of a false twist textured, highly elastic, synthetic crimp yarn with low residual shrinkage and latently bound crimp by stretching, false twisting, heat-fixing and thermal after-treatment of the synthetic yarn at yarn draw-off rates of from 400 to 900 m/min, in which the thread tension during thermal after-treatment is 6-25% of the thread tension during heat-fixing, the time of thermal after-treatment is 2-5% of the time spent in heat-fixing and the temperature of the yarn during the thermal after-treatment is 30.degree.-100.degree. C.
Highly elastic crimp yarn of synthetic endless filaments, having a residual shrinkage of 6 to 7%, a latent crimp of at least 80%, a crimp stretchability of at least 230%, a crimp stability of at least 60% and a crimp contraction force of 8 to 10 mp/dtex.
Dependencies are inferred from the claim text.