Preparation of crimped synthetic yarns directly during the spinning process

Conclusions The practical possibility of preparing yarns with an adequate crimp directly during the spinning process without expensive operations to give yarns a crimp by mechanical means has been demonstrated experimentally.Yarn crimp is achieved by using spinnerets having holes of variable cross-section; this ensures obtaining yarns with a head-tail cross-sectional profile.The authors express their thanks to K. H. Gaitel, a specialist in the Schwartz (East Germany) man-made fibre company and to F. Dolke and G. Tuschan, specialists in the spinneret manufacturing plant in Grebzig (East Germany) for help in carrying out this work.Translated from Khimicheskie Volokna, No. 2, pp. 40–42, March–April, 1985.     

Preparation of crimped polyacrylonitrile fibres

Conclusions The effect of the concentration of the components of the modifying solution and of its temperature on the degree of crimp of polyacrylonitrile fibre has been described.It has been found that the modifying solutions are rather stable in storage for several days at 4–5°C; at room temperature a decomposition of a complex compound formed by the organic components apparently takes place.Translated from Khimicheskie Volokna, No. 2, pp. 39–40, March–April, 1984.     

Equipment for spinning ultrathin synthetic fibres

Conclusions The possibility has been demonstrated of preparing fundamentally new types of synthetic fibres through unique properties which are usable for the manufacture of goods for national demand, with high hygienic and comfort properties.Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 5, pp. 42–44, September–October, 1993.     

Preparation of crimped monocomponent yarns by a wet spinning method

Conclusions The fundamental possibility of obtaining monocomponent yarns with a stable natural crimp in wet spinning by the usual technological scheme has been demonstrated.A natural crimp has been conferred on yarn by creating nonuniform precipitation conditions around the perimeter of each elementary filament due to directed streams of solvent, brought about by a difference in the densities of the solvent and precipitation bath.Translated from Khimicheskie Volokna, No. 5, pp. 21–22, September–October, 1985.     

Preparation of polyarylacetylene fibres by the wet spinning method

Conclusions The solvating power of various solvents for poly-p-diethynylbenzene ahs been evaluated by IR spectroscopy.Polyarylacetylene fibres have been prepared by spinning from amide solvents into an aqueous precipitation bath.Translated from Khimicheskie Volokna, No. 6, pp. 33–34, November–December, 1984.     

Automatic control system for spinning and winding of synthetic fibres

An automatic control system for spinning and winding of synthetic fibres that provides for operation of the electric drive of the metering pumps in conditions of stabilization of the melt pressure and rotation rate of the winder drive was proposed. A laboratory bench that simulates operation of the device for controlling spinning and winding of synthetic fibres based on software provided in a microcomputer was created. A parametric, adjustable, asynchronous electric drive from the KPE series which provides for energy-saving conditions was used for the extruder drive. __________ Translated from Khimicheskie Volokna, No. 3, pp. 56–57, May–June, 2007.     

Change in the acoustical characteristics of man-made fibres during the spinning process

Conclusions The relaxation character of the change in sound propagation velocity in man-made fibres during the stretching process has been confirmed.A relationship has been proposed which describes the change in sound velocity as a result of two competing processes: disorientation and orientation at low and large degrees of stretch, respectively.Translated from Khimicheskie Volokna, No. 4, pp. 18–19, July–August, 1985.     

壳聚糖纺丝原液制备及湿法纺丝工艺初探

研究了壳聚糖纺丝原液在真空脱泡和静置脱泡条件下的表观牯度和特性粘数的变化规律,讨论了尿素、醋酸钠等添加剂对纺丝原液性能的影响,在模拟纺丝设备上进行了纺丝,对纤维力学性能进行了初步分析.结果表明:真空脱泡条件下,壳聚糖纺丝原液粘度随脱泡时间的增加呈先下降后上升的趋势;在静置脱泡条件下,原液粘度呈下降趋势,随着时间的增加,其粘度下降趋缓;在壳聚糖纺丝原液中加入醋酸钠可提高原液的粘度,加速冻胶的形成;加入尿素,纺丝原液粘度下降,纺丝原液中的醋酸钠与壳聚糖摩尔比为0.2～0.4时,纤维力学性能较好.     

Effective polyethyleneterephthalate particles on the spinning process and properties of polyester fibres

Conclusions The polyethyleneterephthalate dust particles which are formed as a result of abrasion of the flake during transportation are highly crystalline, low- and medium-molecular fractions of the polymer which contain an elevated amount of ash-type impurities.An increase in the content of polyethylene terephthalate dust particles in the flake above 0.1% by wt. impairs the homogeneity of the polymer melt, reduces the stability of the spinning process, and reduces the uniformity in physicomechanical characteristics of the polymer yarns.Translated from Khimicheskie Volokna, No. 2, pp. 14–16, March–April, 1990.