系列扁平腈纶的开发

介绍了扁平腈纶的特性及国内外发展状态,重点分析了生产系列扁平腈纶的关键技术,如聚合物及原液的制备、喷丝板设计、纺丝工艺条件的优化等。指出原液温度、负拉伸、凝固浴温度、浓度、流量以及所用的油剂都会对扁平纤维的质量产生影响。     

扁平腈纶湿法成形过程中的挤出胀大行为的模拟

应用Polyflow软件通过理论模拟的方法,对扁平腈纶(PAN纤维)湿法成形过程中的挤出胀大行为进行模拟,建立了喷丝孔口挤出胀大比与纺丝工艺参数之间的关系,研究了纺丝温度、喷头挤出速度、负拉伸率、凝固浴温度等工艺参数对挤出胀大比的影响规律。结果表明:挤出胀大比随着挤出速度、负拉伸率的增大而增大,随着纺丝温度的增大而减小,而挤出胀大比受凝固浴温度的影响较小;对模拟结果进行了实验验证,在喷丝板为0. 1 mm×0. 04 mm、板厚为1 mm、纺丝温度40℃、凝固浴温度10℃、凝固浴质量分数14%、入口流量2. 21×10~(-3)mL/s、喷丝头负拉伸率为-43%的条件下,纺丝制得的扁平PAN纤维的扁平度达到6. 4,线密度为11 dtex,且可纺性好,模拟结果具有合理性。     

防紫外线PA6细旦FDY的生产工艺探讨

采用全消光PA6切片,通过现有FDY生产设备的改进及生产工艺的调整,生产出具有防紫外线功能的PA6细旦FDY。对喷丝板设计、丝条冷却条件、纺丝温度、拉伸倍数、纺丝速度等工艺条件进行了探讨。     

细旦高强涤纶生产工艺的优化

用国产纤维级聚酯切片 ,在常规纺丝设备上生产细旦涤纶高强丝 ,讨论了纺丝温度、喷丝板、纺丝组件、拉伸工艺对细旦丝生产的影响 ,并用正交试验法对拉伸工艺条件进行优选 ,采用优选工艺生产出的细旦高强涤纶长丝强度大于 6 c N/dtex,产品一等品率达 80 %以上。     

33dtex/24f黑色涤纶DT丝生产工艺探讨

从33dtex/24f黑色涤纶DT丝的纺制实践出发,探讨了黑色涤纶细旦DT丝的生产工艺.实践表明,采用国产VC406A型纺丝机与VC443A型拉伸机,选择合适的加工条件,生产黑色细旦DT丝是完全可行的.在选择工艺参数时应考虑色母粒对纺丝生产的影响.合理的纺丝温度、喷丝板孔径、纺丝速度、拉伸倍数是得到性能良好的黑色细旦DT丝的重要因素.     

55dtex/48f涤纶细旦FDY生产工艺探讨

介绍了在FDY设备上采用熔体直纺生产55dtex/48f细旦FDY的工艺路线，并讨论了熔体输送条件、喷丝板的选择、纺丝板的选择、纺丝温度、纺丝速度、冷却条件、拉伸条件、缓冷器的设置、上油条件等对生产细旦FDY的影响。通过适当调整工艺条件，可制得质量较好的细旦FDY。     

油辊上油方式生产直纺涤纶细旦FDY的工艺探讨

介绍了在东丽FDY设备上采用油辊上油方式直纺生产细旦FDY的工艺路线 ,并讨论了熔体输送条件、喷丝板的选择、纺丝温度、纺丝速度、冷却条件、拉伸条件、缓冷器的设置、上油条件等对生产细旦FDY的影响。通过适当调整工艺条件 ,采用油辊上油方式可制得质量较好的细旦FDY。     

WDS用涤纶POY细旦丝生产工艺

对原涤纶 POY纺丝生产线改造 ,调整纺丝上油控制系统 ,对 POY纺丝工艺的研究表明 ,选择合适的喷丝板 ,降低纺丝温度 ,缩短冷却长度 ,降低卷绕速度可获得优良的整经拉伸上浆 ( WDS)用 POY细旦丝     

WDS用涤纶PO细旦丝生产工艺

双原涤纶POY纺丝生产线改造,调整纺丝上油控制系统,对POY纺丝工艺的研究表明,选择合适的喷丝板,降低纺丝温度,缩短冷却长度,降低卷绕速度可获得优良的整经拉伸上浆（WDS）用POY细旦丝。     

涤纶细旦POY-DTY生产工艺探讨

对3.2km/min 纺速生产涤纶细旦 POY-DTY 工艺进行了研究.试验表明,采用国产KV441高速纺丝机与引进 FTF-8E3型拉伸变形机,选择合适的加工条件,生产最终单丝纤度为1.00～1.19dtex 的 DTY 是可行的,其织物的仿真丝效果也较好.适当提高纺丝组件压力,选择合适的喷丝板孔径,冷却条件,变形速度,变形温度,拉伸倍数,选用材质较软的摩擦片,是得到性能较好的涤纶细旦 DTY 的保证.     

Aromatic poly(1,4-phenylene-1,3,4-oxadiazole) fibers by dry jet-wet spinning

Fibers of poly(1,4-phenylene-1,3,4-oxadiazole) have been prepared by dry jet-wet spinning sulfuric acid solutions of the polymer. Polymer was prepared by polymerizing terephthalic acid and hydrazine dihydrochloride in 30% fuming sulfuric acid and directly spinning the resulting solution. Dry jet-wet spinning allows greater flexibility in conditions than does wet spinning in that spinneret temperature and coagulation bath temperature are independent of one another. Therefore, coagulation may be at temperatures well below those needed at the spinneret to maintain a flowing, extrudable solution. Another common advantage of dry jet-wet spinning is application of draw to the extruded fiber before coagulation, but in this system, drawing the fiber before coagulation was shown to be a disadvantage. Fiber properties were maximized by spinning with a spinneret temperature of 58–73°C into a coagulation bath at 3–4°C and with an air gap of 1/4 in. Water as a coagulation medium allowed operation at speeds up to 40 m/min, while with 50% sulfuric acid less than half that speed was reached. Application of draw ratios of 3/1 on the coagulated but still swollen fiber combined with high-temperature treatments at low draw ratios (1.05/l) gave maximum fiber properties–tenacity 6 g/denier, elongation 20–25%, and modulus 200–240 g/denier.     

高强高模聚乙烯醇纤维的生产工艺初探

采用凝胶纺丝,添加硼酸和助剂生产高强高模聚乙烯醇(PVA)纤维,探讨了其生产工艺。结果表明:控制纺丝原液PVA质量分数16%,添加硼酸质量分数1.0%～1.1%;采用Na_2SO_4/NaOH凝固浴体系,其中Na_2SO_4质量浓度为300g/L,NaOH质量浓度为80～100g/L,凝固浴温度45℃,凝固时间25s;选择4段拉伸,湿热拉伸倍数为6,总拉伸倍数为14;生产稳定,得到的高强高模PVA纤维断裂强度达15cN/dtex,模量达320cN/dtex。     

44dtex/144f超细旦大有光涤纶FDY的开发

采用熔体直纺大有光涤纶全拉伸丝(FDY)的工艺进行了44dtex/144f超细旦大有光涤纶FDY(简称超细旦涤纶FDY)的试验及生产,探讨了纺丝温度、无风区高度、集束位置、拉伸工艺等对超细旦涤纶FDY生产的影响,确定了最终生产工艺参数.结果表明:选择喷丝板孔径为0.12 mm、孔深为0.4 mm,喷丝板孔呈同心圆分布,...     

腈纶NaSCN一步法生产中调整喷丝头负拉伸率的研究

采用硫氰酸钠为溶剂,湿纺一步法工艺生产腈纶,探讨了喷丝头负拉伸率对纤维成形的影响。工业化试验表明:当喷丝头负拉伸率为-73％时,纤维可纺性达到最佳状态。     

Dry‐jet‐wet spun polyurethane fibers. I. Optimization of the spinning parameters

This study examined the spinning of polyurethane‐based elastomeric fibers with the dry‐jet‐wet spinning method. The three important spinning variables that were chosen were the coagulation bath ratio (dimethylformamide/water), the bath temperature, and the stretch ratio. A three‐variable factorial design method, proposed by Box and Behnken, was used to optimize these process parameters. The spinning process was further fine‐tuned by the variation of the stretch ratio and the dope solid content. The effect of the dry‐jet length on the fiber properties was also studied. The tenacity and elastic recovery properties of the fibers were found to be optimum at a bath ratio (dimethylformamide/water) of 60 : 40, a bath temperature of 15°C, and a stretch ratio of 2.5. The density and sonic modulus were measured to determine the effect of varying the process variables on structural parameters such as the density and orientation. The surface morphological features, as revealed by scanning electron microscopy, were correlated to the fiber properties. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

细旦有光三叶形FDY生产工艺探讨

介绍细旦有光三叶异形 FDY的生产工艺 ,讨论了在村田 FDY生产线上 ,干燥条件、纺丝温度、冷却条件、纺丝速度、拉伸比等工艺参数对加工 50 dtex/ 4 8f三叶形 FDY的影响 ,适当调整工艺 ,可制得质量较好的细旦有光三叶形 FDY。     

抗起球腈纶纺丝工艺的优化

采用纺丝工艺调整法生产抗起球腈纶。结果表明:在抗起球腈纶生产工艺基础上,选择孔径相对较小的喷丝板,提高负拉伸比,有利于纤维成形;干燥机丝束堆积密度下调3%,湿球温度上调至77～80℃,采用加压过热蒸汽为热定型介质,热定型温度110～115℃,生产的抗起球腈纶抗起球级数达4.0～4.5。     

A study of fiber extrusion in wet spinning. II. Effects of spinning conditions on fiber formation

A study is carried out to investigate the effects of spinning conditions on fiber formation in the wet-spinning process. The spinning conditions studied are free velocity (and hence free diameter), throughput rate, maximum take-up velocity, jet stretch (the ratio of take-up velocity to free velocity), and filament tension. The coagulating bath temperature and concentration are varied, and three spinnerette diameters are used. The spinning dope is an aqueous solution of polyacrylonitrile in sodium thiocyanate. The present study shows that the coagulating bath concentration influences the spinning tension and maximum take-up velocity. Two thread breakage mechanisms are postulated which take into account the rate of coagulation, spinning tension, and thread velocity. An attempt is made to predict the concentration profile of solvent in the moving filament by simultaneously solving the mass and force balance equations, in which the increase in elongational viscosity along the spinning way is assumed to be mainly due to the hardening process.