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CHANGES IN THE QUALITY INDICATORS OF YARNS
OBTAINED FROM A MIXTURE OF COTTON AND
SECONDARY FIBERS WITH DIFFERENT COMPOSITION
S. Patkhullayev
F.Maxammadova, A.Abdusamatov, Sh.Farmonov.
https://doi.org/10.5281/zenodo.14699493
ARTICLE INFO
ABSTRACT
Qabul qilindi:13-yanvar 2025 yil
Ma’qullandi: 15-yanvar 2025 yil
Nashr qilindi: 20-yanvar 2025 yil
Article
physico-mechanical properties of
yarns obtained by a pneumomechanical spinning
machine from fibers of different composition were
studied, in which the fiber content of the yarn: 25%
secondary fiber from the yarn + 75% cotton fiber,
20% secondary fiber + 80% cotton fiber, 30%
secondary fiber + 70% cotton fiber, The effect of
twists of 400 br/m, 500 br/m, 600 br/m on the
properties of yarns made of 15% secondary fiber +
85% cotton fiber was determined.
In order to produce high-quality gauze from cotton fiber, it is necessary to produce high-
quality yarn. In order to produce high-quality yarn, spinning enterprises must have well-
organized and constantly functioning technical control.
Unevenness is a negative property of production products at a spinning enterprise, and often
has a negative effect on the technical and economic indicators of the enterprise, as well as on
the physico-mechanical properties of the yarn. It is important to test and control the
unevenness of the products in spinning production, and it determines the causes and time of
the unevenness. In spinning machines, the more breaks during the winding and forming of the
threads, the higher the unevenness of the thread. As a result of the increase in breakage of
threads, the employment of workers increases, and it leads to a decrease in the productivity of
the machines.
The unevenness of the linear density of the product at the spinning plant is one of the main
negative indicators of quality. This indicator affects the level and unevenness of various
properties of yarn. In addition, the influence of the fiber content on the
unevenness
indicators of yarns is also significant. The more chemically synthetic fibers the threads are
made from, the less uneven they are.
Fiber length, tensile strength and linear density are important in the production of quality
yarn in a spinning plant. The higher the quality of the fiber, the more competitive it can be to
produce quality yarn that meets demand. For this, it is necessary to choose the right raw
materials, and in addition, to create optimal conditions for the processes of storing, drying,
cleaning, ginning, and fiber cleaning of seeded cotton in cotton ginning enterprises.
The quality of the finished products largely depends on how smoothly the spun threads are
processed. If the unevenness of the thread is high, its relative breaking strength will decrease,
which means that the fabric woven from it will be less tough. One of the main reasons for
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unevenness is that the amount of components in the mixture of fibers is not constant, they are
not well mixed.
The main indicators of threads include tensile strength, specific tensile strength, and
roughness indicators.
For this reason, in the production of high-quality and low-cost items, measures were
taken to effectively use scraps without throwing them away. After processing the scraps, the
fiber was spun and staples were formed. Linear density, tensile strength, specific tensile
strength, staple mass length and short fiber content of the prepared sample were determined
in laboratory conditions.
The linear density of the secondary fiber was 171 mtex, the breaking strength was 3.7
sN, 21.6 sN/ tex, the length of the staple mass was 23.5 mm, and the amount of short fibers
was 25.4%.
In the process of production of sewing products, the scraps produced during the preparation
of the product were processed, cotton fibers were mixed with secondary fibers, and the
results of the tests are presented in tables 3.1-3.3.
25% secondary fiber + 75% cotton fiber yarn, 20% secondary fiber + 80% cotton fiber yarn,
30% secondary fiber + 70% cotton fiber yarn, 15% secondary fiber + 85% cotton fiber yarn
from the pneumomechanical spinning machine. Changes in the physical and mechanical
properties of yarns with different number of twists are presented in Tables 1-3 below.
Table 1
Changes in physical and mechanical properties of yarns obtained from a mixture of cotton and
secondary fibers (400 br/m)
t/r Indicators
Mixture of cotton and secondary fibers in yarn,%
25%
secondary
fiber+75%
cotton yarn
20%
secondary
fiber +80%
cotton yarn
30%
secondary
fiber +70%
cotton yarn
15%
secondary
fiber +85%
cotton yarn
1. Linear density of thread, tech
60,8
61,50
60,0
61,10
2. Coefficient of variation in
linear density of yarn, %
4,12
3,26
4,57
3,10
3. The number of twists of the
thread, br/m
400
410
405
407
4.
Coefficient of variation in the
number of twists of the
thread, %
6,7
5,9
6,9
5,7
5. Breaking strength of the
thread, sN
323,8
367,5
311,9
398,2
6. Coefficient of variation in
thread breaking strength, %
6,75
6,12
8,80
5,66
7. Specific tensile strength of
the thread, sN/tex
5,32
5,97
5,19
6,5
8. Elongation of thread at
break, %
10,76
11,22
11,9
10,98
9. Coefficient of variation in
elongation at break, %
12,44
11,95
13,76
11,87
Table 2
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Changes in physical and mechanical properties of yarns obtained from a mixture of cotton and
secondary fibers (500 br/m)
t/r Indicators
Mixture of cotton and secondary fibers in yarn,%
25%
secondary
fiber+75%
cotton yarn
20%
secondary
fiber +80%
cotton yarn
30%
secondary
fiber +70%
cotton yarn
15%
secondary
fiber +85%
cotton
yarn
1. Linear density of thread,
tech
60,3
60,50
60,8
60,7
2. Coefficient of variation in
linear density of yarn, %
3,78
3,12
4,12
2,98
3. The number of twists of the
thread, br/m
505
520
515
518
4.
Coefficient of variation in
the number of twists of the
thread, %
6,2
5,67
6,5
5,44
5. Breaking strength of the
thread, sN
360,12
410,30
376,11
465,23
6. Coefficient of variation in
thread breaking strength, %
6,97
6,78
7,45
4,98
7. Specific tensile strength of
the thread, sN/tex
6,82
7,39
6,19
7,66
8. Elongation of thread at
break, %
10,56
10,45
10,78
9,56
9. Coefficient of variation in
elongation at break, %
11,44
10,45
12,5
9,86
Table 3
Changes in physical and mechanical properties of yarns obtained from a mixture of cotton and
secondary fibers (600 br/m)
t/
r
Indicators
Mixture of cotton and secondary fibers in yarn,%
25%
secondary
fiber+75%
cotton
yarn
20%
secondary
fiber +80%
cotton yarn
30%
secondary
fiber +70%
cotton yarn
15%
secondary
fiber +85%
cotton
yarn
1. Linear density of thread, tech
60,6
60,0
60,5
61,0
2. Coefficient of variation in
linear density of yarn, %
4,02
3,45
4,47
3,12
3. The number of twists of the
thread, br/m
612
608
610
598
4.
Coefficient of variation in the
number of twists of the
thread, %
6,12
5,86
6,88
5,67
5. Breaking strength of the
thread, sN
330,6
398,8
356,7
420,4
6. Coefficient of variation in
7,56
7,44
8,12
5,12
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thread breaking strength, %
7. Specific tensile strength of
the thread, sN/tex
5,45
6,64
5,90
6,89
8. Elongation of thread at
break, %
11,8
10,24
10,56
10,1
9. Coefficient of variation in
elongation at break, %
11,78
11,02
12,98
10,8
As can be seen from the analysis of the research results, with the decrease in the content of
secondary fibers and the increase in the number of twists, the coefficient of variation in the
linear density of the yarn is from 20.87% to 22.38%, and the coefficient of variation in the
number of twists is from 7.3% to 11 decreased to .9%, tensile strength increased from 11.89%
to 21.3%, coefficient of variation of tensile strength decreased from 9.3% to 32.27%, specific
tensile strength increased from 10.88% to 20.89 %, elongation at break increased from 4.1%
to 14.4%, coefficient of variation for elongation at break decreased from 3.9% to 8.32%.
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