Increasing the spinning stability of acrylic fibres

There are two regions of elevated spinning stability separated by a region of unstable jet formation caused by deformation resonance on the spinning stability curves characterizing the maximum deformation of the jets on the distance to their solidification point. Increasing the concentration of solvent (DMAA) in the spinning bath increases the distance to the solidification point and greater expansion of the jet, intensifying the deformation resonance, detected by an increase in the nonuniformity of the linear density of the filaments. With a concentration of solvent of 80% and higher, the solidification point is so far from the spinneret that it does not affect jet expansion; the deformation resonance phenomenon disappears, manifested by an increase in the deformability of the jet and a decrease in the nonuniformity of the linear density of the filaments. Increasing the spinning bath temperature moves the solidification point closer to the spinneret and suppresses deformation resonance, which also increases the deformability of the jet and decreases the nonuniformity of the linear density of the filaments. All-Russian Scientific-Research Institute of Polymer Fibres, Mytishchi. Translated fromKhimicheskie Volokna, No. 5, pp. 16–19, September–October, 1999.     

新型12位对位芳纶生产线的研发

介绍了新型12位对位芳纶生产线的流程和特点,并对该生产线上主要单元机的结构特点和研发重点进行了探讨.新型12位对位芳纶生产线目前已在国内一些化纤厂应用,而且收到了良好的使用效果.     

QTA在连续聚酯装置及纺丝上的应用

介绍在连续聚酯装置上采用25%QTA生产聚酯及其纺丝加工情况。与全用PTA相比,其生产过程、产品质量及纺丝等均能满足现有要求。只是R 21,22的酸值升高、酯化率降低、馏出水的pH值下降;切片的色相b值增加约1.0,tg和tmc有所偏高,吸色深;短丝的断裂伸长率偏低,断裂强度的CV稍高。存在的问题是馏出水系统出现堵塞,预聚釜真空升气系统夹带严重。     

变频调速系统在涤纶两部位纺丝机上的应用

介绍了高性能的变频调速系统在涤纶两部位高速纺丝机上的应用 ,详细阐明了系统组成及其工作特点。     

提高裂解汽油加氢装置的生产能力

裂解汽油加氢装置、其目的是脱除乙烯裂解副产品（裂解汽油）中的C5‘S、C9^ S以上组分,对中心馏分C6～C8进行加氢。齐鲁30万t/a乙烯装置自1987年5月开车以来,一直存在着加氢与乙烯不匹配、一段反应器催化剂中毒、二段反应器压差上升快等问题。本文分析了故障原因并介绍了改进的措施及如何提高裂解汽油的产量。     

Preparation of anti-aerosol respirators by direct spinning from a melt on the UPR-1 unit

Conclusions A pilot-plant unit has been developed and fabricated for the production of anti-aerosol respirators (the UPR-1) by the method of direct spinning from a polymer melt.Various constructions of the take-up assembly have been approved and their technological possibilities have been discovered.VTsNII Okhrany Truda, Tashkent. Stend Kiev Experimental Mechanical Plant. Translated from Khimicheskie Volokna, No. 2, pp. 28–30, March–April, 1992.     

MFE2 compact spinning unit for manufacturing high-strength polypropylene yarns

MFE2 compact spinning unit for manufacturing high-strength polypropylene yarns     

A simplified method of collecting single,low filament number,synthetic threads on spinning machines

Conclusions Collection of thread into containers, rather than winding onto bobbins, shows the following advantages: simplicity and operational reliability of the collecting mechanisms; simple attendance, reduced wastage of fibre; the possibility of increasing winding take-off time; the possibility of increasing the rate of collecting thread; better conditions for preserving the properties of the thread as it is packaged, stored and transported; economy.All-Union Research Institute for Synthetic Fibre Machinery (VNIIMSV), Chernigov. Translated from Khimicheskie Volokna, No. 3, pp. 50–51, May–June, 1969.     

熔体静电纺丝的工艺条件对纺丝纤维直径的影响

主要研究纺丝温度、纺丝电压、接收距离等参数对聚丙烯(PP)熔体静电纺丝纤维直径的影响。采用了只变一个参数,其它参数固定的常规实验方法。在实验条件范围内,随着纺丝温度的升高,纤维的平均直径逐渐减小,得到PP的最佳纺丝温度240℃。在固定电压的情况下,得到最佳接收距离7cm。在固定接收距离的情况下,随着电压的增加,电场中的喷射流熔体受到的电场力逐渐增大,得出最佳纺丝电压35kV。     

Use of nozzles in spinning fibre through spinnerets with a large number of holes

Conclusions It has been established that the use of nozzles, when spinning fibres through spinnerets with a large number of holes, enables the mass transfer between a roving of fibres and the coagulation bath to be increased. This makes it possible to raise the spinning rate, the coagulation bath concentration and the uniformity of properties of the resulting fibre.All-Union Glass Fibre Research Institute. Translated from Khimicheskie Volokna, No. 3, pp. 11–13, May–June, 1969.     

Increasing the number of uses of the refractories in the slide gates of large steel-teeming ladles

Conclusions A method of enrichment of brucite by washing and sorting of it was developed. An experimental lot of composite slide gate plates for two teemings from the 300-ton steel teeming ladles of Magnitogorsk Metallurgical Combine was prepared from enriched fused brucite at Magnesite Combine. The physicochemical indices of the plates were 97.9 wt.% magnesium oxide with a nonequiaxiality of the periclase crystals of 1.94, 0.3% silica, 0.2% iron oxide, compressive strength 110 N/mm², and open porosity 12%. Under conditions of repeated openings and closings the plates made it possible to provide 100% quality teeming of the first heat and to direct 60% of the slide gates to repeated teeming, which was done with 32%. For a final experimental verification it would be desirable to prepare a larger experimental production lot of refractories using the method developed with specific repeated use.Translated from Ogneupory, No. 2, pp. 47–51, February, 1988.     

优化纺丝工艺 提高纺丝速度

通过对纺丝温度和纤维拉伸比等工艺条件的调整试验 ,研究纤维结构变化对成品物理指标和可纺性的影响。详细介绍了提高FDY纺丝速度所进行的工艺改进 ,并从理论上解释了工艺变更的理由