Presentation on Dyeing
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This document discusses dyeing and the dyeing process. It begins by defining dyeing as the process of adding color to textile materials like fibers, yarns, and fabrics using dyes and chemicals. It then describes the two primary types of dyes as natural dyes derived from plants and minerals, and synthetic dyes made in laboratories from sources like coal tar. The document outlines several dyeing methods including mass coloration, fiber dyeing, yarn dyeing, fabric dyeing, and continuous and garment dyeing. It also explains the three steps of the dyeing process as preparation, dyeing, and finishing.
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Mercerization
1. Mercerization is a finishing treatment for cotton that improves luster, hardness, and other properties by treating cotton with a strong alkaline solution.
2. It involves immersing cotton yarn or fabric under tension in a cold sodium hydroxide solution, then neutralizing it in acid. This causes swelling of the cotton fibers and increases their luster.
3. The ideal conditions for mercerization are a caustic concentration of 250-320 g/L at 18-20°C for 30-60 seconds, as this provides the best luster with minimal shrinkage.
Desizing
1. Desizing is done to remove sizing agents like starch that were applied to warp yarns during weaving to facilitate the weaving process.
2. There are several methods of desizing including enzymatic, acid, and oxidative methods. Enzymatic desizing uses enzymes like amylase to break down starch into soluble sugars.
3. Proper control of factors like temperature, pH, and fabric speed are important for effective desizing when using the enzymatic method.
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Textile Printing is an important process on textile industry. Here printing on textile products are described
Dyeing presentation
The document discusses different types of dyes used for textiles, including their chemical properties and fibers they can be used on. It covers natural dyes obtained from plants as well as synthetic dyes developed later. Key dye types discussed include reactive dyes, which chemically bond to cellulose fibers; vat dyes, which are applied in vats and can be used on cotton, wool and leather; acid dyes used for protein fibers like wool; and basic dyes also used for wool and silk. The document provides details on characteristics and applications of different dyes.
Textile printing
Direct printing is the most common method of applying color patterns to fabric. It involves applying dye directly to the fabric in paste form using block printing, screen printing, or roller printing. Discharge printing applies color to the entire fabric first and then removes color in certain areas to create a pattern. Resist printing involves applying a paste that resists dye to the fabric before dyeing it, so the pattern areas are not colored.
Transfer Printing
A brief discussion on transfer printing in textile industry with its different types of application method.
pretreatment is the heart of wet processing.
Pretreatment is an essential process for textile materials prior to dyeing and printing. The key processes include singeing, desizing, scouring, bleaching, and mercerizing. Singeing burns off protruding fibers to smooth the surface. Desizing removes starch coatings from warp yarns. Scouring makes the fabric highly absorbent by removing natural oils and impurities. Bleaching removes natural colorants to whiten the fabric. Mercerizing improves luster, strength, and dye uptake of cotton fabrics. All pretreatment processes prepare textiles for downstream applications.
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www.textilecore.com
The presentation gives you the information about new eco friendly textile processing.
Mercerization
1. Mercerization is a finishing treatment for cotton that improves luster, hardness, and other properties by treating cotton with a strong alkaline solution.
2. It involves immersing cotton yarn or fabric under tension in a cold sodium hydroxide solution, then neutralizing it in acid. This causes swelling of the cotton fibers and increases their luster.
3. The ideal conditions for mercerization are a caustic concentration of 250-320 g/L at 18-20°C for 30-60 seconds, as this provides the best luster with minimal shrinkage.
Desizing
1. Desizing is done to remove sizing agents like starch that were applied to warp yarns during weaving to facilitate the weaving process.
2. There are several methods of desizing including enzymatic, acid, and oxidative methods. Enzymatic desizing uses enzymes like amylase to break down starch into soluble sugars.
3. Proper control of factors like temperature, pH, and fabric speed are important for effective desizing when using the enzymatic method.
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The document discusses different types of dyes used for textiles, including their chemical properties and fibers they can be used on. It covers natural dyes obtained from plants as well as synthetic dyes developed later. Key dye types discussed include reactive dyes, which chemically bond to cellulose fibers; vat dyes, which are applied in vats and can be used on cotton, wool and leather; acid dyes used for protein fibers like wool; and basic dyes also used for wool and silk. The document provides details on characteristics and applications of different dyes.
Textile printing
Direct printing is the most common method of applying color patterns to fabric. It involves applying dye directly to the fabric in paste form using block printing, screen printing, or roller printing. Discharge printing applies color to the entire fabric first and then removes color in certain areas to create a pattern. Resist printing involves applying a paste that resists dye to the fabric before dyeing it, so the pattern areas are not colored.
Transfer Printing
A brief discussion on transfer printing in textile industry with its different types of application method.
pretreatment is the heart of wet processing.
Pretreatment is an essential process for textile materials prior to dyeing and printing. The key processes include singeing, desizing, scouring, bleaching, and mercerizing. Singeing burns off protruding fibers to smooth the surface. Desizing removes starch coatings from warp yarns. Scouring makes the fabric highly absorbent by removing natural oils and impurities. Bleaching removes natural colorants to whiten the fabric. Mercerizing improves luster, strength, and dye uptake of cotton fabrics. All pretreatment processes prepare textiles for downstream applications.
Discharge printing
The document provides information about discharge printing, which is a textile printing process where a bleaching agent is printed onto previously dyed fabrics to remove some or all of the original color. It discusses how discharge printing works, the required fabrics, discharge agents used, importance of discharge styles, discharge screen printing process, positives and negatives of discharge screen printing, and how cotton and polyester fabrics give different results. The document contains detailed technical explanations and considerations for discharge printing.
Blend dyeing
Basic knowledge about blend dyeing
Dyeing of Blended Fibres & Fabrics
Blends:
Blends are any textile material from fiber through yarn to fabric which are deliberate combination of chemically or physically different fibrous polymer. Cotton and Polyester blend is an example of chemically different blend and Cotton and Viscose is physically different blend because both are cellulosic.
Reason for blending:
1.Economy: The dilution of an expensive fibre by blending with a cheaper substitute.
2.Durability: The incorporation of a more durable component to extend the useful life of a relatively fragile fibre.
3.Physical properties: A compromise to take advantage of desirable performance charactristics contribuition by both fibre components.
4.Color: The development of new fabric design for garments incorporating multicolor effect.
5.Appearance: The attainment of attractive appearance & perceptible qualities using combinations of yarns of different lusture, crimp or denier which still differ in appearance even when dyed with same color.
6.Other reasons-
Blending develops fibre properties.
Colorant modification is possible by blending.
Finishing process modification.
Improved moisture absorption, antistatic characteristics, reduced pilling, improved abrasion resistance.
Dyeing Possibilities with Blends:
1.Union Dyeing:
• This is suitable for fabrics containing two fibres to dye them in a single uniform colour, each dye suitable for one kind of fibre in the blend.
• Union dyeing is same as cross dyeing except that instead of multi-colour effects. One solid colour is produced. The dyer accomplishes this by using two or more classes of dye, each of the same colours.
• Different fibres may require different dyes to obtain the same colour; this may be done by putting the appropriate colour dye that is specific to each type of fibre in to one dye bath.
• For eg: a fabric composed of rayon and acetate can be dyed with a solid colour green by using a direct dye for the rayon, and a disperse dye of the same colour for the acetate.
2.Resist/Reserve dyeing:
• In resist dyeing at least one (but not all) of the components of the blend remains essentially undyed i.e almost white.
3.Cross dyeing:
• Cross dyeing produces fibres of contrasting color
• This is two types-
a)Shadow effect/Tone-in-Tone dyeing:
Two fibres are dyed in same hue & brightness but the depth is different. It is called tone-in-tone or shadow effect.
b)Contrast effect:
Two fibres are dyed with strong difference in hue, brightness & depth.This is called contrast effect. Pleasing final appearance is important here.
Chemicals and Auxiliaries used in Textile Wet Processing
This document discusses various chemicals and auxiliaries used in textile wet processing. It defines auxiliaries as chemicals that help processing operations like preparation, dyeing and printing work more efficiently. Some common auxiliaries mentioned include surfactants, wetting agents, sequestering agents, dispersing agents and emulsifiers. Basic chemicals used in wet processing like acids, bases, salts, oxidizing and reducing agents are also discussed. The roles and examples of various chemicals are provided in concise points.
textile dyeing
This document provides information on different types of dyes used in textile processing, including their properties and application methods. It discusses acid dyes, how they are applied to wool fibers in an acidic bath, and their general structure. It also covers basic dyes, including their cationic nature and application to acrylic and wool. Metal complex dyes are discussed as having high fastness properties and not requiring pre-treatment. The document concludes with information on phthalogen blue and alcian blue dyes, used for bright shades, and their application process to cotton which involves dyeing and fixation with alkali.
Resist printing
This document discusses resist printing and batik printing techniques. It explains that resist printing involves applying a substance called a "resist" to parts of the fabric to prevent dye absorption. There are two main types of resist printing: batik printing and tie-dye printing. Batik printing involves applying melted wax in desired patterns using tools like brushes or stamps before dyeing. Tie-dye involves binding, folding or knotting parts of the fabric to prevent dye penetration and create patterns. The document provides detailed descriptions and examples of different batik and tie-dye techniques.
Pigment printing
The document discusses pigment printing, which is a type of textile printing where insoluble pigments are fixed to fabric using a binder. Pigment printing pastes contain thickening agents, binders, and other auxiliaries. It is the most economical printing process as it does not require washing after printing. Screen printing and roller printing are common methods used to apply pigment pastes to fabric in defined patterns.
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The document discusses dyeing processes for textiles. It defines dyeing as changing a textile's physical or chemical properties to make it uniformly colored. The objectives of dyeing are to increase attractiveness, make fabrics suitable for various uses and decorative purposes. The dyeing process involves 4 steps - dye molecules attaching to and migrating within fiber molecules through hydrogen bonding. Common dye types include acid, basic, direct, disperse, sulfur, mordant, reactive, and vat dyes. Dyeing machines include open and enclosed types, and types where materials, liquor, or both circulate. Common dyeing faults result from uneven processes, improper temperatures/times, and machine issues.
Resist printing
The document discusses resist printing techniques, specifically focusing on batik printing. It provides background on batik, noting it originated in Egypt and was later practiced in other parts of Asia and Africa. The document describes the batik printing process, which involves applying wax resist to fabric before dyeing to create patterns. Different regions known for batik printing are highlighted, as well as the raw materials and techniques used. A brief overview of tie-dye printing is also provided.
Printing
This document provides information about various printing methods used in the textile industry. It begins by describing direct printing, resist printing, and discharge printing. It then lists and provides brief descriptions of different types of printing methods, such as screen printing, flock printing, foil printing, heat transfer printing, and dye sublimation printing. The document also includes diagrams of screen printing and rotary screen printing processes. It provides more detailed explanations of techniques like block printing, dye sublimation printing, heat transfer printing, and batik.
Mercerization
mecerization is one kind of optional process.It is used for increasing various properties of cotton.
Textile ecology
This document discusses various aspects of textile ecology, including the impacts of textile production processes on the environment and human health. It describes how pollutants from textile manufacturing can interfere with living organisms. Various textile production steps like cultivation, manufacturing, dyeing and finishing are mentioned. Specific pollution issues from desizing, bleaching, dyeing and printing are summarized. Possible treatments for reducing water pollution from textile waste are also outlined.
Bleaching process in textile processing
Natural fibers contain coloring compounds that make them appear off-white. The objective of bleaching is to remove these color bodies and produce a white fabric using oxidizing bleaching agents while minimizing fiber damage. Hydrogen peroxide is the most widely used bleaching agent for cotton and blends. It works through its decomposition product, perhydroxyl ion, which breaks the double bonds in color compounds at an optimal pH of 10-11. Proper regulation of perhydroxyl ions through stabilizers prevents rapid decomposition of the bleach and fiber degradation. Temperature, time, concentration, and liquor ratio must be optimized to achieve effective bleaching with minimal impact on strength properties.
Introduction to dyeing
The document provides an introduction to textile dyeing, including definitions of basic terms like dyestuff and pigment, an overview of dyeing processes and factors that influence dye choices, and descriptions of different types of dyes including direct dyes for cellulosic fibers, reactive dyes, vat dyes, sulfur dyes, and disperse dyes for synthetic fibers. Classification methods for dyes and dyeing conditions for various fiber and dye combinations are also outlined.
Screen Printing
This document provides an overview of various textile printing methods, with a focus on screen printing. It describes the screen printing process, including screen preparation using photochemical methods, squeegee systems, factors that affect ink passing through screens, and flatbed and rotary screen printing methods. Rotary screen printing is highlighted as the most productive method, controlling approximately 65% of the printed fabric market worldwide by allowing for continuous printing and quick pattern changes. Defects that can occur during screen printing are also outlined.
Textile Fiber ppt by B.A
Textile Fibers are the basic structural units of Textile fabrics. Knowing the building blocks of textile fibers(polymers) is vital inoder to explain chemical and physical properties.
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Textile testing is an important part of the textile production process. It involves determining various properties of fibers, yarns, and fabrics to ensure quality standards are met. The objectives of textile testing include selecting raw materials, controlling manufacturing processes, ensuring quality of finished products, and facilitating research and product development. There are different types of textile testing for fibers, yarns, woven fabrics, knitted fabrics, and nonwoven fabrics. Test methods are established by various standards organizations and influence factors like sampling methods, atmospheric conditions, equipment used, and technician skill.
Reactive Dye
The document provides information about reactive dyes, including:
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- Important reactive groups include triazine, vinyl sulfone, and halogen groups.
- Reactive dyes were invented in 1956 and became popular for their bright colors, low temperature dyeing, and simple process.
- Common application methods are pad-batch and pad-dry processes at low temperatures. Proper pH, electrolyte, alkali, and time are required for effective dye fixation to the fiber.
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this presentation is going to introduce you to the basic styles of printing which are used in our textile industry.
Pilling on fabric surfaces
Pilling is formation of little balls of fibers (pills) on the surface of a fabric which is caused by abrasion in wear.
Pilling is the tendency of fibers to come loose from a fabric surface and form balled particles of fiber
Textile dyeing & Process
Dyeing is the application of dyes or pigments on textile materials such as fibers, yarns, and fabrics with the goal of achieving color with desired color fastness. Dyeing is normally done in a special solution containing dyes and particular chemical material. … In dyeing, it is applied to the entire textile.
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This document discusses various aspects of wet processing in the textile industry. It begins by defining wet processing and dyeing, then describes pretreatment processes like singeing and de-sizing. It also covers scouring, bleaching, and mercerizing. Dyeing methods like printing and dyeing are explained, along with types of dyes and pigments. The document concludes by defining color fastness and various color fastness tests.
TCP-PSG-Dyeing.ppt
This document discusses various aspects of dyeing textiles, including:
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- Preparatory processes like sorting, bleaching, and scouring required for dyeing and printing.
- Classification, properties, and dyeing processes for different types of dyes like acid dyes, basic dyes, disperse dyes, and reactive dyes.
- Factors that influence dye choice and dyeing conditions for different fibers.
- Machinery used for dyeing fibers, yarns, and fabrics like jigger dyeing machines and jet dyeing machines.
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The document provides information about discharge printing, which is a textile printing process where a bleaching agent is printed onto previously dyed fabrics to remove some or all of the original color. It discusses how discharge printing works, the required fabrics, discharge agents used, importance of discharge styles, discharge screen printing process, positives and negatives of discharge screen printing, and how cotton and polyester fabrics give different results. The document contains detailed technical explanations and considerations for discharge printing.
Blend dyeing
Basic knowledge about blend dyeing
Dyeing of Blended Fibres & Fabrics
Blends:
Blends are any textile material from fiber through yarn to fabric which are deliberate combination of chemically or physically different fibrous polymer. Cotton and Polyester blend is an example of chemically different blend and Cotton and Viscose is physically different blend because both are cellulosic.
Reason for blending:
1.Economy: The dilution of an expensive fibre by blending with a cheaper substitute.
2.Durability: The incorporation of a more durable component to extend the useful life of a relatively fragile fibre.
3.Physical properties: A compromise to take advantage of desirable performance charactristics contribuition by both fibre components.
4.Color: The development of new fabric design for garments incorporating multicolor effect.
5.Appearance: The attainment of attractive appearance & perceptible qualities using combinations of yarns of different lusture, crimp or denier which still differ in appearance even when dyed with same color.
6.Other reasons-
Blending develops fibre properties.
Colorant modification is possible by blending.
Finishing process modification.
Improved moisture absorption, antistatic characteristics, reduced pilling, improved abrasion resistance.
Dyeing Possibilities with Blends:
1.Union Dyeing:
• This is suitable for fabrics containing two fibres to dye them in a single uniform colour, each dye suitable for one kind of fibre in the blend.
• Union dyeing is same as cross dyeing except that instead of multi-colour effects. One solid colour is produced. The dyer accomplishes this by using two or more classes of dye, each of the same colours.
• Different fibres may require different dyes to obtain the same colour; this may be done by putting the appropriate colour dye that is specific to each type of fibre in to one dye bath.
• For eg: a fabric composed of rayon and acetate can be dyed with a solid colour green by using a direct dye for the rayon, and a disperse dye of the same colour for the acetate.
2.Resist/Reserve dyeing:
• In resist dyeing at least one (but not all) of the components of the blend remains essentially undyed i.e almost white.
3.Cross dyeing:
• Cross dyeing produces fibres of contrasting color
• This is two types-
a)Shadow effect/Tone-in-Tone dyeing:
Two fibres are dyed in same hue & brightness but the depth is different. It is called tone-in-tone or shadow effect.
b)Contrast effect:
Two fibres are dyed with strong difference in hue, brightness & depth.This is called contrast effect. Pleasing final appearance is important here.
Chemicals and Auxiliaries used in Textile Wet Processing
This document discusses various chemicals and auxiliaries used in textile wet processing. It defines auxiliaries as chemicals that help processing operations like preparation, dyeing and printing work more efficiently. Some common auxiliaries mentioned include surfactants, wetting agents, sequestering agents, dispersing agents and emulsifiers. Basic chemicals used in wet processing like acids, bases, salts, oxidizing and reducing agents are also discussed. The roles and examples of various chemicals are provided in concise points.
textile dyeing
This document provides information on different types of dyes used in textile processing, including their properties and application methods. It discusses acid dyes, how they are applied to wool fibers in an acidic bath, and their general structure. It also covers basic dyes, including their cationic nature and application to acrylic and wool. Metal complex dyes are discussed as having high fastness properties and not requiring pre-treatment. The document concludes with information on phthalogen blue and alcian blue dyes, used for bright shades, and their application process to cotton which involves dyeing and fixation with alkali.
Resist printing
This document discusses resist printing and batik printing techniques. It explains that resist printing involves applying a substance called a "resist" to parts of the fabric to prevent dye absorption. There are two main types of resist printing: batik printing and tie-dye printing. Batik printing involves applying melted wax in desired patterns using tools like brushes or stamps before dyeing. Tie-dye involves binding, folding or knotting parts of the fabric to prevent dye penetration and create patterns. The document provides detailed descriptions and examples of different batik and tie-dye techniques.
Pigment printing
The document discusses pigment printing, which is a type of textile printing where insoluble pigments are fixed to fabric using a binder. Pigment printing pastes contain thickening agents, binders, and other auxiliaries. It is the most economical printing process as it does not require washing after printing. Screen printing and roller printing are common methods used to apply pigment pastes to fabric in defined patterns.
Presentation on Dyeing
The document discusses dyeing processes for textiles. It defines dyeing as changing a textile's physical or chemical properties to make it uniformly colored. The objectives of dyeing are to increase attractiveness, make fabrics suitable for various uses and decorative purposes. The dyeing process involves 4 steps - dye molecules attaching to and migrating within fiber molecules through hydrogen bonding. Common dye types include acid, basic, direct, disperse, sulfur, mordant, reactive, and vat dyes. Dyeing machines include open and enclosed types, and types where materials, liquor, or both circulate. Common dyeing faults result from uneven processes, improper temperatures/times, and machine issues.
Resist printing
The document discusses resist printing techniques, specifically focusing on batik printing. It provides background on batik, noting it originated in Egypt and was later practiced in other parts of Asia and Africa. The document describes the batik printing process, which involves applying wax resist to fabric before dyeing to create patterns. Different regions known for batik printing are highlighted, as well as the raw materials and techniques used. A brief overview of tie-dye printing is also provided.
Printing
This document provides information about various printing methods used in the textile industry. It begins by describing direct printing, resist printing, and discharge printing. It then lists and provides brief descriptions of different types of printing methods, such as screen printing, flock printing, foil printing, heat transfer printing, and dye sublimation printing. The document also includes diagrams of screen printing and rotary screen printing processes. It provides more detailed explanations of techniques like block printing, dye sublimation printing, heat transfer printing, and batik.
Mercerization
mecerization is one kind of optional process.It is used for increasing various properties of cotton.
Textile ecology
This document discusses various aspects of textile ecology, including the impacts of textile production processes on the environment and human health. It describes how pollutants from textile manufacturing can interfere with living organisms. Various textile production steps like cultivation, manufacturing, dyeing and finishing are mentioned. Specific pollution issues from desizing, bleaching, dyeing and printing are summarized. Possible treatments for reducing water pollution from textile waste are also outlined.
Bleaching process in textile processing
Natural fibers contain coloring compounds that make them appear off-white. The objective of bleaching is to remove these color bodies and produce a white fabric using oxidizing bleaching agents while minimizing fiber damage. Hydrogen peroxide is the most widely used bleaching agent for cotton and blends. It works through its decomposition product, perhydroxyl ion, which breaks the double bonds in color compounds at an optimal pH of 10-11. Proper regulation of perhydroxyl ions through stabilizers prevents rapid decomposition of the bleach and fiber degradation. Temperature, time, concentration, and liquor ratio must be optimized to achieve effective bleaching with minimal impact on strength properties.
Introduction to dyeing
The document provides an introduction to textile dyeing, including definitions of basic terms like dyestuff and pigment, an overview of dyeing processes and factors that influence dye choices, and descriptions of different types of dyes including direct dyes for cellulosic fibers, reactive dyes, vat dyes, sulfur dyes, and disperse dyes for synthetic fibers. Classification methods for dyes and dyeing conditions for various fiber and dye combinations are also outlined.
Screen Printing
This document provides an overview of various textile printing methods, with a focus on screen printing. It describes the screen printing process, including screen preparation using photochemical methods, squeegee systems, factors that affect ink passing through screens, and flatbed and rotary screen printing methods. Rotary screen printing is highlighted as the most productive method, controlling approximately 65% of the printed fabric market worldwide by allowing for continuous printing and quick pattern changes. Defects that can occur during screen printing are also outlined.
Textile Fiber ppt by B.A
Textile Fibers are the basic structural units of Textile fabrics. Knowing the building blocks of textile fibers(polymers) is vital inoder to explain chemical and physical properties.
Important of textile testing
Textile testing is an important part of the textile production process. It involves determining various properties of fibers, yarns, and fabrics to ensure quality standards are met. The objectives of textile testing include selecting raw materials, controlling manufacturing processes, ensuring quality of finished products, and facilitating research and product development. There are different types of textile testing for fibers, yarns, woven fabrics, knitted fabrics, and nonwoven fabrics. Test methods are established by various standards organizations and influence factors like sampling methods, atmospheric conditions, equipment used, and technician skill.
Reactive Dye
The document provides information about reactive dyes, including:
- Reactive dyes form covalent bonds with fiber polymers through reactive groups, giving excellent wash and light fastness.
- Important reactive groups include triazine, vinyl sulfone, and halogen groups.
- Reactive dyes were invented in 1956 and became popular for their bright colors, low temperature dyeing, and simple process.
- Common application methods are pad-batch and pad-dry processes at low temperatures. Proper pH, electrolyte, alkali, and time are required for effective dye fixation to the fiber.
Styles of printing
this presentation is going to introduce you to the basic styles of printing which are used in our textile industry.
Pilling on fabric surfaces
Pilling is formation of little balls of fibers (pills) on the surface of a fabric which is caused by abrasion in wear.
Pilling is the tendency of fibers to come loose from a fabric surface and form balled particles of fiber
Textile dyeing & Process
Dyeing is the application of dyes or pigments on textile materials such as fibers, yarns, and fabrics with the goal of achieving color with desired color fastness. Dyeing is normally done in a special solution containing dyes and particular chemical material. … In dyeing, it is applied to the entire textile.
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Dye
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Dyeing_Booklet.pdf
Textile dyeing involves applying color to textiles through dyes or pigments. Natural dyes were traditionally used but synthetic dyes developed in 1856 revolutionized the industry. Proper preparation of textiles through processes like desizing and scouring is important for ensuring even dye absorption and colorfastness. Water quality also impacts dyeing effectiveness. A variety of natural and synthetic dyes are used to color textiles for fashion and other purposes.
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The document discusses dyeing methods and processes at Keya Knit Composite Ltd. It outlines the organizational structure, with the general manager at the top and operators and helpers at the bottom. It then explains the basic concepts of dyeing, including what dyestuffs are, criteria for suitable dyestuffs, and how dyeing works through adsorption, penetration, and fixation. It also lists the types of chemicals used in the dyeing section and provides an overview of the dyeing machines and their processes at the company.
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Presentation on Dyeing
- 1. SHYAMOLI TEXTILE ENGINEERING COLLEGE
- 2. Welcome To My Presentation TOPIC : DYEING
- 3. Dyeing 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.
- 4. Types of Dyes There are many different types of dyes. Two primary categories of dye are : 1. Natural 2. Synthetic
- 5. Natural Dye Natural dyes are colorants derived from plants, trees, or minerals. The majority of natural dyes are vegetable dyes from plant sources such as roots, bark, leaves, and wood and other biological sources such as fungi and lichens.
- 6. Synthetic Dye Synthetic dyes, made in a laboratory, are chemicals often derived from sources like coal tar or petroleum- based substances. They cost less, offered a vast range of new colors and they acquire better properties to the dyed materials.
- 7. Types of Synthetic Dye 1. Acid 2. Basic 3. Direct 4. Mordant 5. Vat 6. Reactive 7.Azoic 8. Sulphur etc.
- 8. Dyeing Method There are several types of dyeing process. Mass Coloration : This method is done to the molten fibers or plastic chips or textile polymer with pigment dyes. After that, the polymers will extrude from spinneret. Fiber Dyeing : The method of dyeing fibers before blending with other colors to give fancy yarn or fabric.
- 9. Dyeing Method Yarn Dyeing: This method is done to yarns in forms of hanks or packages dyeing. Fabric Dyeing : The method done after weaving, knitting, or non-woven to make dyed fabrics. A popular method of dyeing as the dyeing fabrics will be processed further to garment industries very easily.
- 10. Dyeing Method Continuous Method : A method where different machinery is put in such a sequence so that it can produce the dyed fabric in one pass. It is a very fast process but very expensive. Garment Dyeing : This the last method of dyeing goods. However, the dye might not completely penetrate though the fabric such as between the seams, buttons, zippers etc. It is used for socks. Sweater dyeing etc.
- 11. Dyeing Process The dyeing process involves three steps Preparation is the step where unwanted impurities are removed from fabrics before dyeing. Dyeing is the application of color to the textile substrates, mainly using synthetic organic dyes. Finishing involves treatments with chemical compound aimed at improving the quality of fabric.
- 12. Conclusion The dyeing process is one of the key factors in successful trading of textile products. Dyeing methods have not changed much with time. Basically water is used to clean, dye and apply chemicals to the fabrics, and also to rinse the treated fibers or fabrics. The change of technology, from hand power to electrical machinery, fundamentally changed the textile industry, its product marketability and its profitability.
- 13. Thank You!