This document discusses yarn unevenness, its causes, measurement, and impact on quality. Yarn unevenness refers to variations in yarn thickness along its length. It is influenced by raw material variations and spinning process irregularities. Unevenness is measured using the irregularity percentage and coefficient of variation. Higher unevenness can reduce yarn strength, impact fabric appearance with defects, and lower productivity. Careful control of the spinning process is needed to minimize unevenness and maximize quality.
Hairiness is characterized by the quantity of freely moving fibre ends or fibre loops projecting from a yarn or textile fabric (woven, knitted or non woven fabrics).
In term of measurement Hairiness corresponds to the total length of the protruding fibres in unit length of one centimeter.
Knowing the basics of raw material, yarn production process and the other factors influencing quality will put the sourcing manager at the same eye level as a spinner /supplier when negotiating quality issues.
As a consequence this puts the sourcing manager in the position to pay the right price for the corresponding quality level.
This kind of know-how supports a retailer enormously in his efforts to establish a reliable supply chain which is based on mutual understanding.
Pile fabrics: Manufacturing methods include woven pile fabric formation & others methods such as knit pile fabric, tufted pile fabrics etc. A "Terry" or a "Terry Towel" as is generally known is a woven pile fabric formed by slack tension weave process. of weaving.
Cotton is a natural fibre available easily and abundant quantity. It is a most suitable fibre for textile spinning & clothing due to it’s good spinnability & human friendly characteristics. As cotton is a natural fibre hence it’s properties also affected with several other factors which create variation in fibre properties, these variations also affect spinning processes & it’s products Quality in multi dimensions. Each fibre characteristic impact individually and collectively on spinning process or at ultimate product quality. Revolutionary changes observed in last two decade in the field of spinning machineries where processing speeds greatly increased to enhance production rate. Not only production rate of spinning machines increased but speeds of it’s downstream processes also increased simultaneously which requires better quality of yarn for smooth process and without any interruption to get the maximum efficiency. Hence now it is most important to co-relate fibre properties with respect to it’s consumer process competency. In this article we will discuss the different cotton properties and it’s impact on spinning process and product quality in present prospective and will try to minimize the impact of poor fibre properties on process or product Quality through better Mixing plan selection.
Hairiness is characterized by the quantity of freely moving fibre ends or fibre loops projecting from a yarn or textile fabric (woven, knitted or non woven fabrics).
In term of measurement Hairiness corresponds to the total length of the protruding fibres in unit length of one centimeter.
Knowing the basics of raw material, yarn production process and the other factors influencing quality will put the sourcing manager at the same eye level as a spinner /supplier when negotiating quality issues.
As a consequence this puts the sourcing manager in the position to pay the right price for the corresponding quality level.
This kind of know-how supports a retailer enormously in his efforts to establish a reliable supply chain which is based on mutual understanding.
Pile fabrics: Manufacturing methods include woven pile fabric formation & others methods such as knit pile fabric, tufted pile fabrics etc. A "Terry" or a "Terry Towel" as is generally known is a woven pile fabric formed by slack tension weave process. of weaving.
Cotton is a natural fibre available easily and abundant quantity. It is a most suitable fibre for textile spinning & clothing due to it’s good spinnability & human friendly characteristics. As cotton is a natural fibre hence it’s properties also affected with several other factors which create variation in fibre properties, these variations also affect spinning processes & it’s products Quality in multi dimensions. Each fibre characteristic impact individually and collectively on spinning process or at ultimate product quality. Revolutionary changes observed in last two decade in the field of spinning machineries where processing speeds greatly increased to enhance production rate. Not only production rate of spinning machines increased but speeds of it’s downstream processes also increased simultaneously which requires better quality of yarn for smooth process and without any interruption to get the maximum efficiency. Hence now it is most important to co-relate fibre properties with respect to it’s consumer process competency. In this article we will discuss the different cotton properties and it’s impact on spinning process and product quality in present prospective and will try to minimize the impact of poor fibre properties on process or product Quality through better Mixing plan selection.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
Textile fabric may be define as an assembly of fiber, yarn or combination of these. There are several ways to manufacture a fabric.To produce woven fabric yarn preparation is essential.Good preparation means good weaving,Good weaving =Quality fabric.
This is actually for Educational purpose only. I made this Slide for Noman group and Zaber and Zubair Fabrics Ltd. for presentation purpose. I share this for help others who actually need this kind of information and Slide.
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting
Warp knitting is a family of knitting methods in which the yarn zigzags along the length of the fabric, i.e., following adjacent columns ("wales") of knitting, rather than a single row ("course"). For comparison, knitting across the width of the fabric is called weft knitting.Warp knitting machines--needles are mounted collectively and rigidly in a horizontal metal bar (the needle bar that runs the full knitting width of the machine).
Textile fabric may be define as an assembly of fiber, yarn or combination of these. There are several ways to manufacture a fabric.To produce woven fabric yarn preparation is essential.Good preparation means good weaving,Good weaving =Quality fabric.
This is actually for Educational purpose only. I made this Slide for Noman group and Zaber and Zubair Fabrics Ltd. for presentation purpose. I share this for help others who actually need this kind of information and Slide.
The yarn realization is the most important factor to assess the technical performance and profitability of spinning mills. Yarn realization means conversion of raw material in percentage terms into finished yarn. This articles described What are the key factors affecting yarn realization and how to manage it.
Variation in linear density of combed yarn due to dyeing with reactive dye in...eSAT Journals
Abstract Though yarn dyeing is a significant part of wet processing, it still has some major obstacles. It loses its weight as well as strength due to wet treatment. A study on the changes of linear density in combed yarn due to different shade percentages of reactive dye has been conducted and the results are statistically analyzed. Remazol Red RR, Remazol Yellow RR and Remazol Blue RR were used for this experiment. The study reveals that dye shade percentage effects on the linear density negatively. Before 2.5% shade the yarn loss is greater and after 3.5% shade linear density also decreases. 2.5% to 3.5% shade percentage can be taken as the range where loss of linear density is much less than the other percentages. The lowest loss percentage was found for 3% shade for every dyestuff among which Remazol Red RR was the least. Key Words: Combed yarn, Loss percentage, Shade, Linear density.
importance of fibre finess,influences of fibre finess ,effect on stiffness , effect on torsional rigidity, reflection of light , dye absoprtion, method of measurement ,gravimetric method, micronaire
fiber strength and fiber fineness are described in detail about the machinery and discussed about new computerized testing machines which are used to determine the strength and fineness of the fiber.
Quality may define as the level of acceptance of goods or services. It is a relative term. It completely depends on customer satisfaction. Actually product quality is based on product attribute. In textile and apparel industry, quality is calculated in terms of quality and standard of fibres, yarns, fabric construction, colour fastness, designs and the final finished garments.
Testing yarns is essentials. The basic tests that are essential are explained in this video. The yarn number systems the different tests for yarn like strength, length, elongation are discussed here.
Similar to Yarn unevenness and its empact on quality (20)
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...Amil Baba Dawood bangali
Contact with Dawood Bhai Just call on +92322-6382012 and we'll help you. We'll solve all your problems within 12 to 24 hours and with 101% guarantee and with astrology systematic. If you want to take any personal or professional advice then also you can call us on +92322-6382012 , ONLINE LOVE PROBLEM & Other all types of Daily Life Problem's.Then CALL or WHATSAPP us on +92322-6382012 and Get all these problems solutions here by Amil Baba DAWOOD BANGALI
#vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore#blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #blackmagicforlove #blackmagicformarriage #aamilbaba #kalajadu #kalailam #taweez #wazifaexpert #jadumantar #vashikaranspecialist #astrologer #palmistry #amliyaat #taweez #manpasandshadi #horoscope #spiritual #lovelife #lovespell #marriagespell#aamilbabainpakistan #amilbabainkarachi #powerfullblackmagicspell #kalajadumantarspecialist #realamilbaba #AmilbabainPakistan #astrologerincanada #astrologerindubai #lovespellsmaster #kalajaduspecialist #lovespellsthatwork #aamilbabainlahore #Amilbabainuk #amilbabainspain #amilbabaindubai #Amilbabainnorway #amilbabainkrachi #amilbabainlahore #amilbabaingujranwalan #amilbabainislamabad
NO1 Uk best vashikaran specialist in delhi vashikaran baba near me online vas...
Yarn unevenness and its empact on quality
1. YARN UNEVENNESS &
ITS IMPACT ON QUALITY
By Engr. Shan Imtiaz
+92 3006600484
Lecturer
The University of Faisalabad
2. Yarn Unevenness
• Yarn unevenness deals with the variation in yarn
fineness. This is the property, commonly measured as
the variation in mass per unit length along the yarn.
• In other words, it refers to the variation in yarn count
along its length.
• It is the evenness of staple spun yarn that is of concern
here.
• It is a basic and important one, since it can influence so
many other properties of the yarn and of fabric made
from it.
3. Perfectly Even Yarn
• For a spun yarn to be perfect even, we need two
conditions:
• The constituent fibres are uniform in thickness
• The yarn has the same number of fibres in all cross
sections along its length
4. Methods to express Unevenness
• For a complete analysis of quality we use two methods
to express irregularity or unevenness.
1. The Irregularity U%
2. The Coefficient of Variation CV%
5. The Irregularity U%
• It is the % mass deviations of unit length of material and
caused by uneven fibre distribution along length of
strand.
• The irregularity U% is proportional to the intensity of the
mass variations around the mean value.
• The U% is independent of the evaluating time or tested
material length with homogeneously distributed mass
variation.
6. Coefficient of Variation CV%
• The coefficient of variation CV is a well known value for
the determination of the evenness of slivers, rovings and
yarns.
• The Coefficient of Variation (CV) is the standard
Deviation (SD) expressed as a percentage of the mean
CV % = (SD ÷ mean) x 100
• Each process in a spinning mill contributes a part to the
evenness.
7. Comparison of two Fabrics with different CV%
The lower the CV-value, the more even is the material and the more even it will
look in the end-product. Fig shows a comparison between two fabrics with a
low (CV = 11.48%) and a high coefficient of variation (CV = 17.76%).
8. Classification of Variation
• Random Variation
Variation occurring without definite pattern of repetition
or definite sequence of Thick and Thin Places.
• Periodic Variation
Variation show definite sequence of thick and thin
places in strand of material.
1. Short Term Variations
Wave length 1-10 times of fibre length.
1. Medium Term Variations
Wave length 10-100 times the fibre length
1. Long Term Variations
Wave length 100-1000 times the fibre length
10. Causes of Unevenness
• The reason for yarn irregularity is based on the fact that
it is not possible for staple fiber yarns to keep a
constant number of fibers in the cross-section.
• Unevenness is unavoidable but we can minimize
unevenness.
1. Variations in Raw material
2. Variation in Process
11. Reason (Spinning Process)
• In order to achieve an even yarn quality, the spinning
process must be controlled at every stage. This
underlines the fact that an even yarn is the result of a
controlled preparation process.
Up to that point, the origin of faults can often be
found in:
– Incorrect draft distributions in drawing, roving and
spinning
– Incorrect settings of the auto-leveling system at the
finisher drawframe
– Worn-out machine parts at any production stage
12. Unevenness Testing
• The evenness of each preparatory product before
spinning must be monitored and machine settings
adjusted according to the raw material parameters, the
machinery used and the required yarn quality level, as
defined in the yarn quality profile agreed between the
spinner and the retailer.
1. Visual Examination
2. Gravimetric Method (Cut and weigh method)
3. Capacitive Method
4) Mechanical method of sliver/roving evenness measurement
5) Optical method
6) Pneumatic Method
7) Acoustic Method
13. Visual Examination
• Yarn to be examined is wrapped onto a matt black
surface in equally spaced turns. The black boards are
then examined under good lightening conditions using
uniform non-directional light.
14. Uster Tester
• Measuring device (Uster Tester) is a parallel plate air
capacitor.
• The effect of introducing a nonconducting material such
as sliver, roving or yarn into the space between the
plates is to change the capacity of the capacitor.
15. • The change in mass per unit length is proportional to the
change in capacitance.
• These changes in capacitance are detected, amplified
and processed to obtain results in different forms.
16. Impact of Unevenness on Quality
• Irregularity is the most important quality characteristic of
yarn.
• In quality monitoring it plays a crucial role nowadays.
Importance of irregularity arises from the following
factors
• Strength of Yarn
• Better strength realisation from fibre can be achieved if
regularity of yarn is improved.
• The uneven one should have more thin regions than the
even one as the result of irregularity, since the average
linear density is the same. Thus an irregular yarn will
tend to break more easily during spinning, winding,
weaving, knitting or any other process.
17. Impact of Unevenness on Quality
• Fabric Appearance
• Irregularity has a profound influence on appearance of
yarn and fabric.
• More regular the yarn, better will be the appearance and
aesthetic value of the product. As a result, better sale
value can be achieved.
• Neps can influence the appearance of woven or knitted
fabrics quite considerably.
18.
19. When the yarn evenness exceeds certain limits, it will result in a
cloudy fabric appearance.
20. Impact of Unevenness on Quality
• Fabric Defects and Rejections
• Fabric defects and rejections are critically influenced by
irregularity of yarns.
• Defects such as streaks, stripes, barre, or other visual
groupings develop in the cloth. Such defects clearly
apparent to eye and are usually compounded when the
fabric is dyed or finished, as a result of the twist
variation accompanying them.
• Periodic irregularities in yarn result in warp way streaks
and weft bars in woven fabrics leading to fabric
rejections.
22. Impact of Unevenness on Quality
• Fabric Feel
• Regularity contributes to a smoother feel. In apparel and
most of other textiles, smoothness is most desired
characteristic. Sale value of fabric is dependent, among
other things, on smoothness.
• Luster Effect
• Other fabric properties such as abrasion or pill-
resistance, soil retention, drape, absorbency,
reflectance, or luster may also be directly influenced by
yarn evenness.
23. Impact of Unevenness on Quality
• Productivity
• During winding even yarns give more production
efficiency. Uster cuttings less.
• Because of the lower incidence of weak places, fewer
end breaks are encountered with regular yarns in
weaving preparatory, weaving and knitting.
• Efficiency in these processes is improved leading to
higher productivity.