| 摘要 |
PURPOSE:To manufacture multi-filament having extremely uniform physical properties, without causing the fusion of the filaments, by boring the spinning nozzles along plural circularly arranged rows to a spinneret, wherein the spinning nozzles are divided into 2-8 groups by the plural radially arranged unbored region, and selecting the distance between the nozzles, the maximum diameter and the minimum diameter to specific respective values. CONSTITUTION:A number of spinning nozzles 2 are bored to the spinneret 1 along plural (3 in the cse of the figure) circular rows. The circular rows are divided into 2-8 groups by the plural unbored regions (parts devoid of nozzle) common from the outermost row to the innermost row. The distance between the nozzles 2 at the innermost row is selected to 1.7-4mm.. The diameter D1 (mm.) of the innermost row, the diameter D2 (mm.) of the outermost row, and the total number of the spinning nozzles (H) is made to satisfy the formula I . The area S1 of the bored region and the area S2 of the unbored region preferably satisfy the condition of the formula II.
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