“JOURNAL OF SCIENCE-INNOVATIVE RESEARCH IN
UZBEKISTAN” JURNALI
VOLUME 03, ISSUE 06, 2025. JUNE
ResearchBib Impact Factor: 9.654/2024 ISSN 2992-8869
418
APPLICATION OF METHODS FOR CONTROLLING AND
REDUCING YARN DEFECTS IN A SPINNING PLANT.
Urishev M.M
Fergana Polytechnic Institute
Abstract
: This article presents the fact that unevenness has negative properties
of products produced in a spinning enterprise, often negatively affects the technical
and economic indicators of the enterprise, as well as the physical and mechanical
properties of yarn, the importance of testing and controlling unevenness of products
in spinning production, and the causes and timing of unevenness are determined.
Keywords:
Unevenness, yarn quality, Dispersion, quadratic inequality,
geometric irregularity, quantitative structure of the product, unevenness index
Abstract:
V dannoy state konstatiruetsya chto neravnomernost
otritsatelnym priznakom produktsii na pryadilnom predpriyatii, it often has a
negative influence on the technical and economic indicators of the predpriyatii, and
also on the physical and mechanical properties of the pryaji, it is necessary to check
and
control
the
neravnomernost
produktsii
pryadilnogo
proizvodstva,
ukazyvayutsya chiny i vremya vozninoveniya predpriyatii.
Keywords:
Irregularity, quality of yarn, Dispersion, quadratic irregularity,
irregularity of geometric structure, quantitative composition of products, indicator
of irregularity
Annotation:
In this article, it is stated that unevenness is a negative feature
of production products in a spinning enterprise, often negatively affects the technical
and economic indicators of the enterprise, as well as the physical and mechanical
properties of yarn, it is important to test and control the unevenness of products in
spinning production, the reasons and time of causing unevenness are specified.
Keywords:
Unevenness, yarn quality, Dispersion, quadratic unevenness,
geometric structure unevenness, quantitative structure of the product, unevenness
index
.
Unevenness is a negative property of products produced in a spinning
enterprise, often negatively affecting the technical and economic performance of the
enterprise, as well as the physical and mechanical properties of the yarn. Testing and
“JOURNAL OF SCIENCE-INNOVATIVE RESEARCH IN
UZBEKISTAN” JURNALI
VOLUME 03, ISSUE 06, 2025. JUNE
ResearchBib Impact Factor: 9.654/2024 ISSN 2992-8869
419
controlling the unevenness of products in spinning production is of great importance,
determining the causes and timing of unevenness.
The more yarn breaks during winding and forming in spinning machines,
the higher the yarn unevenness. As a result of the increase in yarn breaks, the labor
supply of workers increases, and the productivity of the machines decreases. In
carding machines, the unevenness of the nature of the processing, that is, the degree
of cleaning and separation of the fiber, is not the same. In addition, an unevenly
combed wick is formed. If a product with uneven structure or linear density enters
the stretching device of various machines, the area of the stretching force and friction
force changes. If the unevenness of the yarns cooked in linear density is high, defects
are formed in the appearance and structure of the fabric, as a result, the surface of
the fabric becomes striped, chipped, mohair or frame-like. These defects can also be
observed in knitted fabrics. If the yarns have high unevenness in terms of strength
and other properties, then the woven and knitted fabrics will have high unevenness
in terms of strength, elongation and elasticity. Unevenly spun yarns in terms of linear
density lead to the formation of specific defects in production. Therefore, it is
important to study and control the unevenness of spinning products under production
conditions in accordance with the above factors. Control of the unevenness of the
product in terms of linear density. The conditions imposed on the quality of spinning
products are called unevenness.[1]
The analysis of the unevenness of spun products is very complex. There are
many types of unevenness for spun products: those that are formed in the first stage
of spinning, and those that change in the subsequent stages and add new types of
unevenness to them. Yarn unevenness combines several components and affects the
unevenness of different stages of spinning production. Different types of unevenness
are interconnected. The above factors make it difficult to distinguish the causes of
unevenness. The following types of irregularities are determined by the change in
specific properties along the length: linear density, unevenness in the number of
fibers in the product section or unevenness in the weight of the section of different
lengths, unevenness of the product in terms of its bulk density (density), unevenness
in the physical and mechanical properties of the product (strength, elongation,
elasticity, moisture, air permeability, electrical resistance, size of electric charges,
etc.). The change in the structure of the product along the cross-sectional area and
length characterizes the arrangement of elements in the product and changes in its
“JOURNAL OF SCIENCE-INNOVATIVE RESEARCH IN
UZBEKISTAN” JURNALI
VOLUME 03, ISSUE 06, 2025. JUNE
ResearchBib Impact Factor: 9.654/2024 ISSN 2992-8869
420
properties and determines two groups of structural irregularities: qualitative
structural and geometric structural irregularities. The distribution of irregularities
based on the type, color and other properties of the fibers along the cross-section of
the product. The quantitative assessment of this type of unevenness is carried out by
determining the sectoral and radial unevenness, as well as the fiber migration
coefficient. The second group includes geometric structural irregularities, which are
divided into the following forms: Ply, i.e. a dense arrangement of fibers of one type
and color, passing along the cross-section and the entire length of the product. This
form of irregularity is formed in the form of pile obtained from fibers of different
types and colors on pile machines. The quantitative structure of the product, i.e. the
quantitative arrangement of fibers in the pile in a large number of successive degrees
of flattening and straightening, is formed in the form of structural irregularities. The
arrangement of fibers in groups, i.e. the uneven arrangement of the fiber layer of
different groups in terms of fiber size along the cross-section and length of the
product, is manifested in the form of uneven structure, layer, warp and weft of
spinning products and in the form of fiber layers on the inter-machine and inter-
machine. During the stretching of fibers located in groups, a new type of irregularity
in linear density is created.[2]
Structural irregularities of various types of products and their properties
have different characteristics. Depending on the nature, the nature of the change in
the structure and properties of the product is: periodic, random, functional, that is, a
one-sided increasing deviation (quality indicators constantly increase or vice versa);
local (random, a sudden increase in the linear density of the product); combined (a
combination of several types of irregularities). The size and nature of the product's
unevenness depends on the production conditions and the type of machinery. The
unevenness is distinguished as follows:
-internal-intrinsic unevenness of the packaging during production;
-outer-between the average values of the product in all packages
unevenness;
-general-unevenness in the entire package. [3]
SuchThe division of unevenness is determined in the working parts of the
machine, and a product with high unevenness is produced. Unevenness by linear
density is one of the main indicators of the quality of spun yarns and other products
of the spinning process. Unevenness index and degree. In technological processes,
“JOURNAL OF SCIENCE-INNOVATIVE RESEARCH IN
UZBEKISTAN” JURNALI
VOLUME 03, ISSUE 06, 2025. JUNE
ResearchBib Impact Factor: 9.654/2024 ISSN 2992-8869
421
namely, combing, mixing and carding, operations are carried out. Therefore, a
“random” arrangement of fibers is assumed in the layer or pile. Sometimes, the
actual arrangement of fibers differs from random.
The product unevenness of the real fibers is always higher than the
unevenness of the randomly arranged fibers. Therefore, the Poisson distribution is
assumed for the distribution of the number of fibers in the cross-section of the high-
level product, and the squared unevenness of the product over its cross-sectional area
is determined by the following formula.[4]
(1.1)
where: mур -number of fibers in the product cross-section; Cd -squared
unevenness of the fiber along the diameter. The above formula can be written in
abbreviated form as follows:
(1,2)
where: K0 is a coefficient depending on the type of fiber, which is 1.06 for
cotton fiber, at C≤ 35 percent; 1.1 g for wool fiber at C≤50 percent; 1.02 for viscose
fiber; and 1.3 for flax fiber; Cг is the high degree of product unevenness. [5]
The unevenness index is the ratio of actual product unevenness to the maximum
product unevenness, which is determined using the following formula:
(1.3)
In this
(1.4)
As the actual product becomes more uneven, the unevenness index also
increases. The unevenness index proposed by G.M. Barnet serves to compare the
unevenness of yarns of different linear densities.[6]
“JOURNAL OF SCIENCE-INNOVATIVE RESEARCH IN
UZBEKISTAN” JURNALI
VOLUME 03, ISSUE 06, 2025. JUNE
ResearchBib Impact Factor: 9.654/2024 ISSN 2992-8869
422
(1.5)
where: M is the average number of fiber groups in the cross section of the yarn,
which is determined using the following formula:
(1.6)
The final formula proposed for determining the unevenness of a spun yarn is
as follows:
(1.7)
This formula is only used for fibers with a cross-section of m. If the number of
fibers is 64<m, then the unevenness index is used. GMBernet developed a value for
the degree of unevenness of a spun yarn to assess the unevenness.[7]
≥ 64
In conclusion, the structural unevenness of different types of products and their
unevenness in terms of their properties will have different characteristics. The
unevenness of different sizes and characteristics of products will vary depending on
the production conditions and the type of machines. The product unevenness of real
fibers is always higher than that of randomly arranged fibers, and the unevenness of
yarns will be affected by the unevenness of different stages in the spinning process,
adding several components to it. The unevenness of different types will be related to
each other.
“JOURNAL OF SCIENCE-INNOVATIVE RESEARCH IN
UZBEKISTAN” JURNALI
VOLUME 03, ISSUE 06, 2025. JUNE
ResearchBib Impact Factor: 9.654/2024 ISSN 2992-8869
423
References.
[1]
R.X.Nurboev Technical supervision of textile enterprises Training
manual Bukhara-2021
[2]
A. Sh. Khusanova. Optimization of geometric dimensions of ginning
elements of selective technologies // FarPI "Journal of Scientific Technology" Issue
4. "Optimization of geometric dimensions of ginning elements of selective
technologies" Fergana-2020 P.158-160
[3]
A. Salimov, Sh. A. Khusanova. Analysis of experience in the
introduction of modern information and communication technologies in ginneries.
Republican scientific-technical conference International scientific-educational
electronic journal. No. A3-21.10.2020.
[4]
A. Salimov, O. Salimov, Sh. Khusanova, I. Khakimov "The problems
of natural fiber and textile materials on fire resistance" Saarj journal Akademicia: an
international multidisciplinary research journal April-2020.
https://saarj. com/wp-
content/uploads/special-issue/2020/ACADEMICIA-JULY-2020-SPECIAL-
ISSUE.pdf
[5]
O. Sh. Sarimsakov, NM Sattoriv, ZASiddikov, Sh. A. Khusanova.
Improvement of the Process in Disassembling of Cotton Stack and Transferring the
Cotton into Pneumotransport// International Journal of Advanced Science and
Technology Vol. 29, No. 7, (2020), pp. 10849-10857
[6]
Yu. Ergashev, A. Sh. Khusanova, O. Sh. Sarimsakov, Kh. Turdiyev, J.
Oripov. Selective technologies of sawing Fergana Polytechnic Institute "Selective
technologies of sawing madness" "Classic" publishing house-2020 ISBN: 978-9943-
6662-7-6.
[7] Ergashov Yu. Urishev M.M "Saw genie pd supplier increasing cleaning
efficiency by supplying hot air to the device" Obrazovanie nauka i innovatsionnye
idei v mire
