| 摘要 |
PURPOSE:To obtain titled yarn having uniform appearance free from fluff and end breakage, by twisting yarn bundle of alumina filament precursor in a specific twist coefficient and heat-treating the bundle so that the filament is provided with cohesion properties and process flow is extremely improved. CONSTITUTION:Yarn bundle of alumina filament precursor is twisted in >=350, preferably >=700 twist coefficient and heat-treated to give aimed yarn. In twisting the bundle of filament precursor. an up-twister is preferably used as the twister because it causes no troubles such as end breakage, etc., Number of revolutions of the twister spindle in the operation is preferably 500-3,000r/m.
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