【摘要】 针对熔体直纺涤纶预取向丝(POY)装置生产278 dtex/288 f品种时1~#生产线较2~#生产线产品优等率低的情况，从设备及工艺两方面对比分析其影响因素，重点探讨1~#生产线丝束集束位置对生产及产品质量的影响，并进行相应的技术改进。结果表明：在其他设备和工艺参数相同的前提下，丝束在水平方向集束位置即喷丝板中心点至油嘴集束位置形成的角度不合适是1~#生产线产品优等品率低于2~#生产线的主要原因；将丝束集束位置形成角由原来的90°调整为85°,生产中断头次数减少56%,降等丝饼量减少83%,产品优等品率由原来的97.27%提升至98.46%,生产稳定；丝束集束位置形成角由90°调整为85°后，生产的278 dtex/288 f涤纶POY的断裂强度变异系数、断裂伸长率变异系数、条干不匀率、含油率变异系数均有较大幅度的降低，降幅分别为18.7%、20.1%、8.8%、51.7%,产品质量更加均匀稳定。更多还原

【Abstract】 In response to the top-quality rate of production line 1~# lower than that of production line 2~# in the production of 278 dtex/288 f product on a melt direct spinning plant for polyester pre-oriented yarn(POY), the influential factors were compared and analyzed from two aspects of equipment and process, the effect of the tow collection position of production line 1~# on the production and product quality was emphatically discussed, and the corresponding technical improvements were conducted. The results showed that the main reason for the top-quality rate of production line 1~# lower than that of production line 2 was the inappropriate horizontal collection position of the tow, i.e. the angle between the center point of the spinneret and the collection position of the nozzle, on the premise of the same other equipment and process parameters; the number of breaks and the amount of downgrade silk cakes were reduced by 56% and 83%, respectively, and the top-quality rate was raised from 97.27% to 98.46% under stable production when the angle of tow collection position was adjusted from 90° to 85°;and the coefficient of variation in breaking strength and elongation at break, yarn unevenness and oil content variation coefficient of the produced 278 dtex/288 f polyester POY were significantly decreased with reductions of 18.7%, 20.1%, 8.8% and 51.7%, respectively, indicating a more uniform and stable product quality, when the angle of tow collection position was adjusted from 90° to 85°.更多还原