Properties of complex viscose yarns containing elementary filaments of different linear density

Conclusions Breaking loads and deformation properties of complex viscose yarns containing elementary filaments of different linear density have been studied.The change in structural nonuniformity over a cross-section of viscose textile filaments of different linear density has been quantitatively evaluated.Translated from Khimicheskie Volokna, No. 3, pp. 47–48, May–June, 1985.     

Nonuniformity in cooling a bundle of elementary filaments in towers having sidestream air-blowing

Conclusions Experimental data obtained by a contactless method on the cooling of filaments in a bundle of large density in towers with sidestream blowing indicate a difficultly eliminated nonuniformity in the cooling of the elementary filaments present in the central part and on the periphery of the bundle.An increase in air delivery somewhat reduces nonuniformity in the cooling of a bundle of filaments in the region of the sweeping devices themselves, without leading to a significant decrease in cooling nonuniformity past their limits.The study performed shows that calculation of the temperature profiles of elementary filaments in a bundle differs from calculating the temperature profiles of monofilaments.Translated from Khimicheskie Volokna, No. 3, pp. 19–21, May–June, 1988.     

Technological features of the manufacture and textile processing of acetate yarns having enhanced compactness

Conclusions The technological features of the manufacture of pneumatically connected twisted (80 twists/m) yarns and possibilities of their textile processing have been examined.It has been shown that yarns with the structure obtained can be used in weaving instead of twisted yarns with a twist of 136 twists/m.Translated from Khimicheskie Volokna, No. 4, pp. 35–37, July–August, 1986.     

Effect of the structure of the elementary filaments on the tension of complex viscose yarns during drying

Conclusions The effect of the structure of the elementary filaments on the tension of a complex viscose yarn during drying has been investigated.It has been found that the tension of viscose yarn during drying under isometric conditions is increased with increase in the proportion of skin in a transverse section of the elementary filaments.Translated from Khimicheskie Volokna, No. 1, pp. 27–28, January–February, 1986.     

Effect of linear density of elementary viscose filaments on the properties of complex yarns and fabrics made from them

Conclusions A decrease in the linear density of the elementary filaments essentially does not affect the physicomechanical properties of complex viscose yarns. However, with decrease in the linear density of the elementary filaments, important changes are observed in properties which determine their wear resistance; durability against repeated double bends is increased, but the resistance to abrasion is reduced.The use of complex viscose yarns having a reduced elementary filament linear density aids in the preparation of fabrics with greater covering power, which creates conditions for reducing the volume of material.Translated from Khimicheskie Volokna, No. 5, pp. 32–34, September–October, 1984     

Radiation resistance of acetate and triacetate yarns

Conclusions The radiation resistance of acetate and triacetate yarns has been studied. It has been shown that, in retention of physico-mechanical properties at a radiation dose of 10 Mrad, the yarns may be placed in the series: acetate, dull > acetate, bright > acetate dyed > triacetate, bright.It has been found that irradiation of acetate yarns with small doses leads to an increase in their resistance to abrasion with practically complete retention of the original strength. The effect of radiative improvement is higher in acetate yarns which have been dulled with titanium dioxide.Translated from Khimicheskie Volokna, No. 3, pp. 31–32, May–June, 1988.     

Normalization of specific electrical resistance characteristic of complex acetate yarns

Conclusions It has been shown that, regardless of the type of lubricant or its content on acetate textile yarn, an essentially identical decrease in specific electrical resistance is observed.The specific electrical resistance of acetate yarns which have been treated with lubricants lies in a range which ensures normal processing of such yarns into textile articles.Translated from Khimicheskie Volokna, No. 6, pp. 20–21, November–December, 1989.     

Orientation processes in acetate yarns under the influence of certain solvent vapors

Conclusions Treatment of acetate yarns with vapors from solvents which form a liquid-crystal phase with the polymer leads to initiation of orientation processes which are accompanied by spontaneous yarn elongation. This makes it possible to prepare yarns of low linear density and with improved physicomechanical properties.It has been found that the action of vapor from nitromethane, which forms a lyotropic, liquid-crystal phase in cellulose acetates, takes place in several stages.A mechanism has been proposed for the interaction of the polymer with vapor from a solvent which forms a liquid-crystal phase with it.Translated from Khimicheskie Volokna, No. 2, pp. 13–15, March–April, 1989.     

Properties and application of Ovilan-2 texturized viscose yarns

Conclusions Ovilan-2 texturized viscose yarn has satisfactory physicomechanical characteristics, whose uniformity is improved on doubling two or more yarns.The high-bulk structure of Ovilan-2 yarns is stable to hot-moist or mechanical actions during the processing operations.Ovilan-2 yarn which has been dyed in bulk corresponds to the requirements imposed on a raw material for the manufacture of double-weave Jacquard carpeting.Translated from Khimicheskie Volokna, No. 3, pp. 43–45, May–June, 1983.     

Properties of yarns spun from a cellulose triacetate melt

Conclusions The physicochemical and physicomechanical properties of yarns spun from a cellulose triacetate melt have been studied.It has been shown that in physicomechanical properties CTA yarns spun from the melt are identical to yarns spun by the dry method.It has been found that the lower sorptive power and lower shrinkage of yarns from the melt are connected with the special features of their spinning.Translated from Khimicheskie Volokna, No. 5, pp. 23–25, September–October, 1984.     

Effect of moisture content on the physicomechanical properties of polyamide yarns

Conclusions The effect of small amounts of moisture during a short interaction time (not over 2 sec) with undrawn Kapron fibre on its ability to undergo deformation and its structure is discussed.It has been found that applying an aqueous lubricant onto freshly spun yarn during the process of joint spinning and stretching leads to a rise in the stretching tension and an impairment in deformational ability as compared with the deformation of the dry yarn. This phenomenon is explained by a mechanism of the interaction of polyamides with water.Translated from Khimicheskie Volokna, No. 6, pp. 27–28, November–December, 1983.