PP FDY装置生产中低旦PA6工业丝的技术改造

Technological innovation of low-and medium-denier PA6 industrial yarns production on PP FDY plant

对丙纶全拉伸丝(FDY)设备进行改造,并优化生产工艺,生产了PA6中低旦工业丝。结果表明:通过对切片氮气保护、单体抽吸、上油、热辊外套、喷丝板等设备改造,采用相对黏度约2.8的PA6切片,控制纺丝温度(278±5)℃,侧吹风速度(0.35±0.05)m/s,侧吹风温度18℃,相对湿度90%,拉伸倍数4.4,拉伸热辊温度65～190℃,生产467 dtex/70 f PA6工业丝,生产稳定,纤维断裂强度6.72 cN/dtex,断裂伸长率21.63%,完全能够满足用户的要求。

Low- and medium-denier PA6 industrial yarns were produced on a PP fully-drawn yarn（FDY） plant by technological innovation and process optimization. The results showed that the PA6 industrial yarn of 467 dtex/70 f can be produced smoothly, which completely satisfied the demand of customers with the breaking strength 6.72 cN/dtex and elongation at break 21.63%, by reforming the chip nitrogen protection, monomer suction unit, oiling method, hot roller shell and spinneret under the conditions as followed： PA6 chip with the relative viscosity about 2.8, spinning temperature （278 ± 5） ℃, cross air blow speed （0.35 ± 0.05） m/s, temperature 18 ℃ and relative humidity 90%, draw ratio 4.4, and hot roller temperature 65 - 190 ℃.