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STUDY OF THE IMPACT OF THE METHOD OF STRAWING ON THE QUALITY OF TWIST TWISTED YEARS FOR GARMENTS
Bоtirova Rano Holjigitovna, masters,
Tashpulatov Salih Shukurovich, Doctor of Technical Sciences, Professor, Ataniyazov Oybek Kazbekovich, masters,
Matismailov Sayfulla Lolashbaevich, Candidate of Technical Sciences, Associate Professor, Muradov Tahir Bahramovich, Candidate of Technical Sciences, Associate Professor, Tashkent Institute of Textile and Light Industry E-mail: ssht61@mail.ru
STUDY OF THE IMPACT OF THE METHOD OF STRAWING ON THE QUALITY OF TWIST TWISTED YEARS FOR GARMENTS
Abstract. torsion of threads for sewing threads is one of the main technological processes in the production of textile materials. Twisted household yarn is widespread. The need for it is growing every year. Twisted yarn is a thread consisting of two or more yarns. Twisted yarn has higher qualities than single yarn. The main advantages of twisted yarn are: stable structure, increased breaking load, uniformity of elongation, resistance to abrasion, elasticity, uniformity, gloss and smoothness. The expansion of the range of high-quality fabrics, knitwear, curtains and tulle products necessitates a further increase in the production of twisted yarn.
Keywords: torsion, textile materials, yarn, quality, stable structure, breaking load, elongation, abrasion resistance, elasticity, uniformity, shine.
Torsion is one of the main technological processes in the production of textile materials. Twisted household yarn is widespread. The need for it is growing every year. Twisted yarn is a thread consisting of two or more yarns. Twisted yarn has higher qualities than single yarn. The main advantages of twisted yarn are: stable structure, increased breaking load, uniformity of elongation, resistance to abrasion, elasticity, uniformity, gloss and smoothness [1]. The expansion of the range of high-quality fabrics, knitwear, curtains and tulle products necessitates a further increase in the production of twisted yarn.
Based on the above, an experimental study was conducted of the influence of the spinning method, the linear density of the yarn, the magnitude of the final twist on the quality of the twisted yarn.
Experimental studies are carried out in the production conditions of the spinning mill and the twisting production of TashKaya Textil JV.
A single cotton yarn with a linear density of 29 tex was produced on both AUTOCORO -240 pneumatic spinning machines (Germany, Schlafhorst) and P-76-5M6 ring spinning machines of type 5 and 1-2 sorts of cotton.
Semi-finished and single yarn is produced according to factory spinning plans.
Yarn rewind from cobs from ring spinning machines is carried out on AUTOCONER winding machines.
The yarn stitching of both spinning methods in 2 additions is carried out on the AES-12 walking machine (from Savio), and the twisted yarn is twisted on the Savio TDS double-twisting twisting machine.Twisted yarn in 2 additions of linear densities of 29 tex x 2 was produced from a single yarn of both spinning methods using double twisting machines from Savio (Italy) with varying values of the final twist.
The subject of research was to determine the coefficient of hardening of yarn of different methods of spinning in torsion, the definition of twisting, lengthening, unevenness by properties.
Indicators of the basic physicomechanical properties of twisted yarn of linear densities 29 tex x 2 obtained from single yarn of ring and pneumomechanical spinning methods, and for convenience of comparative analysis, the main indicators of the quality of twisted yarn of all variants are given in the (Table 1).
From the data in the table it can be seen that in the process of twisting single yarns of any spinning method, the twisted yarn is hardened; with a decrease in the linear density of the twisted yarn of any spinning method, the harden-
Section 9. Technical sciences
ing coefficient of the yarn increases; with an increase in the final twist, the coefficient of hardening of all types of yarn increases, since the pressure of the fibers and filaments on each other increases in the process of torsion; hardening in
Table 1. Twisted Yarn Indicators
a twisted yarn of a pneumomechanical method of spinning (any linear density) is noticeably lower than hardening of a yarn of a ring method of spinning with the same twists and one thickness.
Kind of yarn Twist ratio Twist Y1% The resulting Hardening coefficient K yn Fiber strength factor K HO
a0 linear density, tex R H
Ring spinning
29/2 tex 40.2 32.2 0.998 58.7 1.105 0.58
29/2 tex 40.2 40.1 1.012 59.5 1.12 0.59
29/2 tex 40.2 47.9 1.015 59.7 1.17 0.61
Pneumatic spinning method
29/2 tex 45.7 32.2 0.98 57.2 1.03 0.44
29/2 tex 45.7 40.1 0.99 57.8 1.08 0.46
29/2 tex 45.7 47.9 1.0 58.4 1.11 0.476
This is due to the presence in the rotor yarn of a loose outer layer of obviochny fibers, which play a significant role in the process of imposing twists. Surface fibers subjected to bending due to torsion, have less tear resistance than core, less curved fibers [2].
It has been established that during torsion of a rotor yarn, there is a slow unwinding of the strands at low and medium secondary twists due to the presence of loose outer layers and obvivochnye fibers in the yarn, which, forming a large contact surface when twisting, prevent the twisting of the constituent threads. This affects the twisting of the yarn, which for PSMP yarn is close to 1 at a ratio of a1/a0 = 1.03 and even has a nega-
References:
tive twisting (i.e., is lengthened when twisting) with a small final twist a1(a0 = 0.73 - 0.9).
Hardening of the yarn in the process of torsion leads to an increase in the coefficient of the use of fiber strength to 0.61 for the ring spinning yarn and to 0.476 for the primary health care yarn.
The addition of single yarns leads to an increase in the uniformity of the properties of the twisted yarn. The reduction ratio of unevenness in linear density and breaking load from 0.7 to 0.9, depending on the magnitude of the final twist. The elongation at break of twisted yarn is greater than that of a single yarn and increases with increasing twist.
1. Borzunov I. G., Badalov K. I., Goncharov V. G. and others. Spinning cotton and chemical fibers.- 2-e ed.- M.: Legprombytizdat, 1986.- 199 p.
2. Yu. V., Pavlov M. I. Ivanova. Torsion production, - M. Legprombytizdat, 1986.
