Selection of the optimum parameters for spinning of modified acetate textile fibre

Tashkent Institute of Textile and Light Industry. Translated from Khimicheskie Volokna, No. 2, pp. 20–22, March–April, 1994.     

Mechanism of draw resonance in chemical fibre spinning

It was shown on the example of spinning fibres from solutions of poly-(p-phenylene terephthalamide) that periodic partial breaking of the spun jets is a resonance phenomenon in spinneret drawing. The model of a fibre spun in the resonance mode is considered to consist of two truncated cones and a cylinder. The first cone in the path of the fibre reflects solidification of the solution and the second reflects tensile strain and breaking; a thin cylindrical part is formed during relaxation and feeding of a new portion of solution. It was hypothesized that based on the outer characteristics (appearance of periodicity under the effect of external tensile force, preservation of the approximate constancy of the period), spinneret draw resonance can be considered a special kind of resonance which we propose calling draw resonance. All-Russian Scientific-Research Institute of Polymer Fibres, Mytishchi. Translated fromKhimicheskie Volokna, No. 3, pp. 25–30, May–June, 2000.     

Dialog intelligent systems for natural and chemical fibre spinning technology

An important direction in the use of computers for technological purposes is the creation of intelligent technological systems that simulate the intellectual activity of the researcher and make it accessible to the practitioner. The use of a morphological approach to synthesis of intelligent process systems of different structure was suggested. The characteristics of automated intelligent technological systems were demonstrated on the example of development of a dialog-graphic system for studying the change in the fibre length in spinning and a dialog experimental-statistical system of adjusting process equipment in spinning. Moscow State Textile Academy. Translated fromKhimicheskie Volokna, No. 4, pp. 41–44, July–August, 1999.     

Mechanism of polyacrylonitrile fibre spinning by the thiocyanate method

Conclusions 1. The process of spinning PAN fibres by the thiocyanate method into baths with various precipitating powers has been studied. The mildness and severity of the baths have been varied by varying the NaSCN concentration from 12 to 24%, and also varying the temperature from 5 to 20°C.2. A dependence of the threshold precipitation concentration on polymer content of the spinning solution has been shown. At a polymer content of 13.5%, the threshold precipitant (water) concentration at which precipitation begins is 63%.3. At NaSCN concentrations above 22–24% in the precipitation bath, a precipitant concentration is established on the surface of the forming fibre at the moment of contact between the spinning solution and the precipitation bath which is below the threshold value, and precipitation begins after a certain time, during the course of which, as a result of diffusion, the precipitant concentration is raised to the threshold level.4. On softening the spinning conditions by increasing the NaSCN concentration in the precipitation bath up to a certain limit, a fibre is formed with a more perfect fibril structure, which ensures obtaining a stronger carbon fibre.5. Extreme softening of the spinning conditions leads to an increase in fibre porosity. The suggestion is advanced that this phenomenon is connected with a change in the mechanism of spinning solution phase breakdown where, along with polymer precipitation in the form of a solid phase, partial precipitation in the form of a liquid phase takes place.Translated from Khimicheskie Volokna, No. 5, pp. 3–7, September–October, 1993.     

Rheological properties of spinning compositions for spinning biocatalyst fibre

Conclusions Rheological properties of protein-containing spinning compositions intended for spinning biocatalyst fibres have been studied.The rheological properties of these spinning compositions depend on the composition of the aqueous phase, the concentration of protein, and the modification of the protein; this is explained by a change in state of the protein at the interface and in the bulk of the aqueous phase.Modification of the protein leads to an increase in stability of the process of spinning the biocatalyst fibre by the wet method.Moscow Textile Institute. Translated from Khimicheskie Volokna, No. 1, pp. 9–11, January–February, 1987.     

Theory of viscose fibre spinning

Translated from Khimicheskie Volokna, No. 1, pp. 5–7, January–February, 1989.     

Change in structure of polypropylene during processes of fibre spinning by the high-speed method

Conclusions Conditions for preparing polypropylene fibres from polymers of various structural modifications, orientations, and crystallinities at spinning speeds of 1000–5000 m/min have been studied experimentally.The investigated fibres are characterized by a high degree of crystallinity and orientation of the crystalline regions.Depending on fibre spinning speed, a transition is observed through definite morphological structures — from spherulitic to a typical fibrillar structure, which is formed at very high spinning speeds.Translated from Khimicheskie Volokna, No. 6, pp. 47–49, November–December, 1989.     

Kinematic characteristics of spinning oksalon fibre

Conclusions Based on the data obtained, a fibre region has been found where mechanical action on it is very effective.Translated from Khimicheskie Volokna, No. 1, p. 25, January–February, 1984.     

Cooling of the polymer jet in fibre spinning

Conclusions The effect of various technological parameters (jet stretch ratio, temperature and flow rate of the polymer melt, temperature and velocity of the air which cools the melt, and rheological characteristics of the polymer) on the change in temperature and viscosity of the polymer jet along the length of the spinning zone has been investigated.It has been shown that the temperature of the cooling air, the Stanton number, and the velocity of the cooling air exert the greatest effect on the fibre temperature at the take-up device, but jet stretch ratio and rheological properties of the melt affect fibre temperature only slightly.Translated from Khimicheskie Volokna, No. 6, pp. 19–20, November–December, 1987.