7kt/a丙纶短纤维生产技术

PRODUCTION TECHNOLOGY OF 7kt/a PP STAPLE FIBER

从意大利引进的7kt/a丙纶短纤维装置,包括大型环吹风纺丝头的八位纺丝机及从拉伸至打包后加工生产线一条。其内环吹冷却成形工艺,适合高密度多孔纺丝,环吹风出口与喷丝板距可在5—25mm间调节;风速快、冷却效果好,适合于纺粗、细旦乡种规格纤维;生产效率高,但丝条内外层风速差异大,冷却成形不匀;采用美国通用电气公司的可编程控器,对工艺参数具有监控、调节、贮存、联机等功能,该装置投产后,作了如下技术改造:①随温度升高逐步调整对螺栓预紧张力,解决了熔体过滤器的漏料问题;②改变油剂搅拌速度,提高油盘液位,变丝束与油辊为逆向运动,调整卷曲棍间隙,增设油剂循环使用系统。使纤维含油率达0.7%-1.2%,耗油量降为18kg/t丝以下,③开发了国产丙纶纺丝油剂PPS-2,性能超过德国汉高公司的BK2011;④改进了切断机刀盘,⑤改进了打包机气压转箱系统,保证了转箱一次到位。该装置开车后,除生产17dtex地毯用丝外,还开发了17—25dtex×150mm、5-9dtex×58mm、8—13dtex×75mm半精梳毛纺用、非织选用丙纶丝和1.7—2.8dtex×36.5mm高强低伸棉纺用、非织造用的丙纶丝。

This 7kt/a PP staple fiber production line is the biggest one in China which comprises 8 large scale circular quenching spinning heads and relative after-proce-ssing machines from drawing to cutting. The radial circular quenching technology issuitable for spinning with spinneret with huge number of holes in high density. Thedistance between quenching gap and spinneret can be adjusted between 5-25mm.High quenching air velocity and high cooling efficiency result in high productioncapacity and the capability of producing various types of staple fibers either coarseor fine deniers. But on the other hand, the unevenness of cooling effect is a littlehigher due to the difference of quenching air speed between inside and outside layerof as-spun filaments. The line is equipped with a programmable controller madeby General Electrical Company of USA with the functions of supervision, control,memory and synchronization of the line. After starting up, following technicalreformations were carried out: ① leakage of the melt filter was solved by regulatinggradually the pretightening torque of fastening bolts in accordance with the increaseof temperature; ② through regulating the speed of the stirring, raising the levelof finish, changing the direction of rotation of oiling disk in counterflow with theyarn path, adjusting the gauge of crimping rollers and installation of circulating andrecycle system of oil finish, the oil finish comsumption is decreased to 18kg/t whilethe oil finish content of fiber reaches 0.7-1.2%; ③ developing new PP oil finishPPS-2 of which the properties can reach and exceed that of BK2011 imported fromHenkel Company of Germany; ④ improvement of the specifications of cutting dickof the cutter; ⑤ improvement of the pneumatic rotating system of baler so as toassure the rotating operation once into the right position. Besides 17 dtex fiber forcarpet production, 17-25dtex/150mm, 5-9dtex/58mm, 8-13dtex/75mm fibers for semi-worsted spinning system and non-woven production and 1.7-2.8dtex/36.5mm fiberwith high tenacity and low elongation for cotton spinning system and non-wovenproduction are developed after starting up.