This document summarizes a presentation on dyeing problems and remedies. It discusses common problems that occur during different stages of the dyeing process like pretreatment, dyeing and printing, and finishing. Pretreatment problems account for 21% of issues and are a major cause of other dyeing problems. The document outlines specific problems at each stage and their potential causes. It then provides recommendations for remedies, including using specialty chemicals, controlling temperature and tension carefully, and conducting lab tests. Overall, the key messages are that proper pretreatment is critical to avoid issues in dyeing, and that identifying the root cause of any problem is important before determining a solution.
How dyeing & printing defects spoil your garment?ThreadSol
This ppt will take you through various defects’ causes and remedies due to dyeing & printing defects. Check out the full article on https://goo.gl/HB6lxn
How dyeing & printing defects spoil your garment?ThreadSol
This ppt will take you through various defects’ causes and remedies due to dyeing & printing defects. Check out the full article on https://goo.gl/HB6lxn
High-Dimensional Network Estimation using ECLHPCC Systems
Kshitij Khare & Syed Rahman, University of Florida, present at the 2015 HPCC Systems Engineering Summit Community Day. In this presentation, we will discuss the motivation/theory behind CONCORD and its advantages over previous methods. In particular, we will discuss how the CONCORD estimate is superior to the empirical covariance matrix. We will end with an example detailing the implementation and use of the CONCORD algorithm in ECL. An exposure to multivariate statistics is helpful, but not necessary. Attendees should expect to come out with an understanding of sparse covariance estimation, its applications and how to use the CONCORD algorithm in ECL.
Detection of faults during production of knitted fabric is crucial for improved quality and productivity. The yarn input tension is an important parameter that can he used for this purpose. We can Problems faced in the Knitted Fabrics, due to the Dyeing & Finishing processes
(Over Dyeing) to dye for a second or third time with a different color. Over dyeing is such a rewarding way of rescuing an ugly or unsatisfactory colored cloth. It gives uneven look. sometimes over dyeing doesn’t mean all-time dyeing the garment which is previously dyed. Over dyeing may be normal dyeing or piece dyeing process.
TEXTILES 101 – QUIZ #5 (TAKE HOME) DUE 10/18/14
RAPA – T/R 7PM-8.15PM Name:
Multiple Choice
1. Polyester filling used in a quilt is this type of textile:
A. meltblown nonwoven
B. felt
C. spunbond nonwoven
D. interlock
E. airlaid nonwoven
2. Another name for double-needle-bar raschel is:
A. simplex knit
B. lace
C. spunlace
D. interlock
E. spacer knit
3. Round shoelaces are often manufactured using this process
A. twisting
B. weaving
C. bonding
D. braiding
E. flat knitting
4. The process of making leather pliable, rot and water resistant is
A. snuffing
B. tanning
C. ageing
D. splitting
E. anti-fungus
5. Leather made from the most durable and expensive part of the hide is called
A. suede
B. split grain
C. top grain
D. pleather
E. coarse grain
6. In the video on leather manufacturing, what chemical is used to turn the animal skin blue?
A. Citric Acid
B. Chromium sulfate
C. Hydrochloric Acid
D. Sodium Hydroxide
E. Methylene Blue
7. Carpet is usually manufactured using this method:
A. knitting
B. tufting
C. felting
D. stitching
E. braiding
8. Color matching under one light source, but not with any other light source is called
A. bezold effect
B. lab dipping
C. metamerism
D. incandescent
E. crystal theory
9. The number of needles per inch in a knit is the
A. gauge
B. wale
C. count
D. course
E. decitex
10. Which fabrication method is made with a series of interlocking loops?
A. braiding
B. lace-making
C. knitting
D. weaving
E. chenille
11. Which of the fabrics below is a sliver knit?
A. velour
B. interlock
C. tricot
D. ponti-di-roma
E. fake fur
12. Which of the following is not a nonwoven fiberweb structure?
A. spunlaced
B. air-laid
C. needlepunched
D. laminated
E. spunbonded
13. Cordonnet is a type of
A. brocade
B. a surface embroidery
C. re-embroidered lace
D. tapestry
E. battenburg lace
SHORT ANSWERS
14. List the five steps involved in machine weft knitting:
15. a) Identify the following stitch:
a)
b) How is this stitch used in weft knitting?
16. What can be produced on a Sangiacomo knitting machine?
17. Describe one resist dyeing technique
18. When needles on one bed line up directly across from needles on the other bed, this is called:
19. List the two kinds of warp knitting machines:
a)
b)
20. Describe the 3 main nonwoven bonding mechanisms:
21. a) Name a product you use or wear that is made out of a non-woven textile:
b) Describe what type of nonwoven it is and how it is produced:
22. a) Describe one method of printing:
b) What is the advantage of using this print method over others?
Chapter 19
Dyeing and Printing
T101
Survey of the Textile Industry
Christina Rapa
[email protected]
215-490-7999
Important product characteristic
Goal: produce a ...
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Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
1. PRESENTATION
ON
DYEING PROBLEMS AND REMEDIES
PRESENTED BY,
FAHMIDA SULTANA; ID#073-23-653
SADDAM HOSSAIN BHUIYAN; ID#073-23-626
DIPAK KUMAR SARKER; ID#073-23-568
S.M.MOHIUDDIN; ID#073-23-657
SABBIR AHMED MAJUMDER; ID#073-23-592
2. Dyeing is the process of adding color to textile products like fibers,
yarns, and fabrics. Dyeing is normally done in a special solution
containing dyes and particular chemical material. After dyeing, dye
molecules have uncut Chemical bond with fiber molecules. The
temperature and time controlling are two key factors in dyeing.
The stages in the processing of textile dyeing:
4. Pretreatment that is known accurate composition. The chemicals are
used for pre-treatment of all fibers and are used for removing dirt, oil,
fatty and waxy impurities. Moreover, these chemicals also act as a mild
stain remover.
70% of the problems due to dyeing can be attributed to the
preparatory pretreatment, because it is the first stage in dyeing
processing. So, dyeing depends on its effectiveness and efficiency.
The dyeing process which follows pretreatment depends on a
number of parameters like:
1. Time
2. Temperature
3. Conc. of chemicals and auxiliaries selection
4. pH of the process etc.
5. Pretreatment problems
Poor absorbency.
Catalytic damage/poor fluidity.
Stains.
Moire effect.
Shade change from selvedge to selvedge.
Shrinkage/distortion.
Creasing/chafe marks.
Handling.
Inferior brightness/luster.
Cloudy dyeing.
Skitteriness.
Pale areas.
Dark spots.
Rope marks.
6. Pretreatment remedies
Use of specialty chemicals.
Select suitable heat setting temperatures.
Thorough relaxation of the material.
Controlled tension and uniformity of batching
during pretreatment.
Checking for rough patches in the machine.
Carry out lab tests.
Carry out preliminary tests with material.
Quality inspection before and after pretretment.
7. Dyeing problems
1. Unlevelness(due to dyeing conditions)
‡ Ending problems
‡ Cloudy dyeing
‡ Pale areas
2. Unlevelness(due to material)
‡ Barriness
3. Unlevelness(due to other reasons)
‡ Skitterness
‡ Listing
‡ Pale areas after dyeing
4. Reproducibility
‡ Deviation of shade
‡ Dyeing too pale
‡ Precipitates in the dye bath
‡ Change of shade
5. Fastness properties
‡ Unexpectedly poor light fastness
‡ Unexpectedly poor wet and rub fastness
6. Spots, marks
‡ Precipitates in the dye bath
‡ Singeing droplets
‡ Change of shade (e.g. blue spots in brilliant red shades)
‡ Dark spots
‡ Specks
‡ Dirt spots
8. Dyeing problems
7. Appearance of the goods
y Dimensional stability (shrinkage)
y Creasing
y Chafe marks
y Stitch distortion (knits)
y Moire effects (on beam)
y Luster
y Handle
y Pilling (staple fibers)
8. Other problems
y Difficulty with heavy shades on fine denier yarn
y Soiling of machine
y Frosting on goods
y Poor running of material in subsequent processing
9. Thermosol dyeing problems
y Listing
y Two-sidedness
y Dark or pale selvedges
y Barry dyeing
y Spots, specks
y Ending
y Pale points of intersection
y Foam formation
y Frosting
9. Major 10 causes of dyeing problem
1. Inadequate pretretment.
2. Wrong dyeing program.
3. Irregular tension.
4. Dye sensitivity.
5. Mechanical affect,Chemical affect & Material affect.
6. Stained adjacent fiber.
7. Migration due to chemicals, wrong dyeing program, drying.
8. Use of volatile carrier, silicon, dispersant.
9. Residue of alkali, boiling agent.
10. Fiber surface, fiber origin & physical change in fiber due to
local pressure, temparature.
10. Major 10 remedies of dyeing problem
1. Optimizing a dyeing process.
2. Select dyes with better dispersion stability, use efficient
dispersants.
3. Adjust the machine more carefully
4. Use special chemicals, antifoamers.
5. Pay attention to perfect pretreatment.
6. Select special dyes (smallll-molecule) .
7. Use silicone-free defoamers & Select suitable carriers, use
overhead heating in the machine.
8. Pay attention to cleanness in the machine
9. Check temperature and air current in drying machine.
10. Avoid migration by using lowest possible pickup and a
suitable migration inhibitor.
11. Fabric defects due to dyeing problems
A.dyeing of cellulosics
Defect Cause Remedies
1.Specky/patchy dyeing Water drop on fabric & too
much foaming.
Avoid water drop & use
defoamer.
2.Dark colored spot Incompatibility & too much
high dyestuff concentration.
Select proper dyestuff& check
the solubility of dyestuff.
3.Dark or light selvedges Non uniform batching . Proper batching.
4.Center of selvedge variation Uneven wearing out of rolls
of padding mangle
&temparature variation.
Unifrom expression from
padding mangle & unifrom
temparature.
5.Face to back variation Migration during
intermediate drying.
Ensure working of all the fan
in dryer.
6.Oxidation patches in vat
dyeing
Improper or premature
oxidation
Take proper care during
oxidation.
7.Bronginess & white marks
in sulphur dyeing
Presence of free sulphur in
the dye bath
Use sodium sulphate.
12. Fabric defects due to dyeing problems
B.dyeing of polyester component of blended fabrics
Defect Causes Remedies
1.Perforetion mark Inadequate leader cloth on to
the beam
Use adequate leader cloth.
2.Moire effect Too high tension during
batching and inadequate heat
setting.
Proper tension during
bathing &poor heat setting of
fabric prior to dyeing.
3.Darker dyed selvedges Improper over lapping. Give proper overlapping.
4.Crush mark in jet dyeing Improper jet diameter. Depending upon fabric
quality.
5.Oily stains Use of wrong type of
defoamer.
Use proper defoamer
particularly when dyeing on
rapid jet dyeing m/c.
6.Poor light fastness Presense of carrier in dyed
fabric
Though removal of carrier.
7.Barre dyeing Basic difference in the
polyester component
particularly when using
textured filament weft.
Take appropriate preventive
measure to avoid mix up of
weft.
13. Yarn defects due to dyeing problems
Yarn defects are-
‡ Strength loss
‡ Harsh handle
‡ Channel building
‡ Unlevel dyeing
‡ Poor batch to batch reproducibility
‡ Package deformation & yarn abrasion
‡ Shade variation in Inner, Middle & Outer layer
14. Yarn defects due to dyeing problems
Remedies for defect in yarn-
1. Package density & size: A uniform package density and size has to be
ensured .
2. Angle of winding: Good winding produces a package of even densities with
good running off properties & minimum of end breakage. Package with cross
winding are preferable.
3. Perforation of spindle: Choking of perforation on spindle hinders smooth
& uniform flow of liquor leading to uneven results.
4. M:L Ratio: A proper MLR has to be maintained during dyeing for
consistency of batches.
5. Pump pressure: The change in pressure after reversal of cycle should not
be significantly high. Necessary action has to be taken for smooth reversal &
prevention of choking of pumps.
6. Entrapped air: Complete air removal has to be ensured prior to pressure
build up for uniform results.
7. pH, Temp. & Time: Optimum values of those parameters have to be
maintained during every stage of processing for best results.
15. 5 tips for remedies of dyeing problem
1. Right first time and all the time right.
2. Maintaining a competative edge is to lay emphasis on
³Quality´.
3. Fullest knowledge on basic facts.
4. Before find a solution of a problem find the cause.
5. Process control,which is one of the most effective
manegerial tool.