| 摘要 |
PURPOSE:To obtain a fineness of constant denier stably at a low cost, by melt spinning a polyester containing specific fine inert particles. CONSTITUTION:A polyester containing 0.1-3.0wt% fine inert particles, preferably silicon oxide, having 10-100mmu average particle diameter, and containing <=7wt% coarse particles having >=120mmu particle diameter is melt spun preferably at 2,500-6,000m/min spinning speed to give the aimed ultrafine polyester yarns having <=0.5 denier filament fineness.
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