Reactive dyeing process pdf

Depending on the reactivity of the dye two processes are possiblesingle. Pdf dyeing of cotton fabrics using reactive dyes by. The effect of different ultrasound frequency on knitting material dyeing the effect of ultrasound of different frequencies on dyeing process, when dye reactive orange 16 is applied, is presented in fig. Quality woollen goods are frequently dyed in the form of loose fibre, but top dyeing or cheese dyeing is favoured in treating worsteds. A dyeing or printing process is complicated, since it involves fibre kinds, yarn or fabric structures, dyes and chemical auxiliaries, as well as dyeing technology. Principle and process of dyeing reactive dyes news. Us4806126a process for alkalifree dyeing and printing with. Chapter 1 introduction reactive dyes definition fiber reactive dyes are colored organic compounds that are capable of forming a covalent bond between reactive groups of the dye molecule and nucleophilic groups on the polymer chains within the fiber 14. Dyeing vat dyes, textile dyeing industry an environmental hazard, textile dyeing process, textile dyeing machine,textile dyeing and finishing, textile dyeing. Pfd prepared for dyeing rtd ready to dye definitions. Reactive dyes can also be used to dye wool and nylon, in the latter case they are applied under weakly acidic conditions. Pdf the chemistry of reactive dyes and their application. In a reactive dye, a chromophore an atom or group whose presence is responsible for the colour of a compound contains a substituent that reacts with the substrate.

Padsteam dyeing of cotton with reactive dyes using biodegradable alkaline organic salts a thesis submitted in fulfilment of the requirements for the degree of doctor of philosophy awais khatri b. Package dyeing ht hp cheese yarn dyeingii reactive dyeing of cotton yarn in cheese form. We are capable of the disavow the presence and significance of alkali of dyeing of cotton material with reactive dyes as its crucial to preserve the dyeing situation in the medium of alkali. Dyeing and printing processes are valueadded treatments for most textile materials. Process flow chart of knit fabric dyeing with reactive dyes. Removal of reactive red 24 dye by clean electrocoagulation. Dyeing of cotton fabric with reactive dyes textile learner. A dyeing process is the interaction between a dye and a fibre, as well as the movement of dye into the internal part of the fibre. Fixation processes, which cure reactive dyes to the fabrics, generally include steaming the printed fabric with highly saturated steam followed by washing in hot. They can be applied using onebath dyeing on polyestercellulose pescel blends, saving dyeing time. Here the dye contains a reactive group and this reactive. The common dyeing process of cotton yarn with reactive dyes at package form is as follows.

They offer a high performance range for medium and dark shades, a high fixation rate and a much shorter washingoff cycle. Knit dyeing is near similar as yarn dyeing process but there is some difference in quality measurement. During dyeing the reactive group of this dye forms covalent bond with fibre polymer and. An attempt has been taken to reformulate the dyeing process of cotton fabric with the aim of reducing the environmental pollution with economic advantages by the substitution of harmful chemical auxiliaries with ethanol at low concentration. In conventional method, garments are made with predyed fabrics and then cutting and sewing.

Ice dyeing 101 using fiber reactive dyes dear handmade life. Dyeing is the aqueous application of dyes on textile substrate1. Whether it is vinylsulphone or bifunctional dyestuff, you may follow the following dyeing cycle for yarn dyeing. Reactive red 1, and anthraquinone dyes were used to obtain bright blue shades. Methods of dyeing process of dyeing the chemistry of the. Buildup of shade by using alkaset aob in critical color there is an even buildup of shade by using alkaset aob. Pdf cost efficiency process of reactive dyeing in the. But the dyeing sequence and chemical brand can be different depending on the choice of the manufacturer. June 11, 2012 knit dyeing wet processing technology engr. Methods of dyeing process of dyeing the chemistry of. I discovered the ice dye process almost 9 nine years ago but only in the last few years have worked closely with the process. Their use on cellulosic fibres is especially important, but their growing popularity on polyamide substrates is notable. Reactive dyes definitionclassificationproperties and. Process flow chart of knit fabric dyeing with reactive dyes june 11, 2012 knit dyeing wet processing technology engr.

Dyeingknit fabric, machine, shade, dyes and chemicals, flow process,fastness i. Reactive dyes are mainly used for dyeing cellulose fibres such as cotton and viscose, but they are also increasingly gaining. The paper attempts to develop the relationship between temperature of water and quantity of dye stuff and its effect on quality of dyeing for cold dyeing process for m. Reactive dyes were initially introduced commercially for application to cellulosic fibers, and this is still their most important use 14, 15. Dyeing process was followed at different temperatures 30, 40 and 50c. Their use on cellulosic fibres is especially important, but. The fiber reactive dyes are known as the best for cotton for its wide range of. They have very strong buildup and high fixation, resulting in outstanding reproducibility and less pollution. This is the basis of continuous dyeing process to be possibly used with reactive dyes. Sep 12, 2015 an attempt has been taken to reformulate the dyeing process of cotton fabric with the aim of reducing the environmental pollution with economic advantages by the substitution of harmful chemical auxiliaries with ethanol at low concentration. There were no starches, sizing or finishes applied to the fabric which could interfere with the dyeing. The process of applying color to fiber stock, yarn or fabric is called dyeing.

An early example in the remazol series is remazol brilliant blue r c. The present invention relates to a new dyeing process based on the exhaustion principle. Reactive dyes, reactive cold dyes, reactive he dyes. It is characterized in that dyeing liquors are used which, in addition to the dyestuff or dyestuff mixture, contain one or more salts, at least one compound having a glycidyl radical and, if appropriate, further auxiliaries. Reactive dyes for exhaust processes huntsman corporation. In order to achieve the required dyeing or printing quality, all factors that may influence the dyeing or printing process must be precisely controlled table. The first examples of reactive dyes utilized monoazo systems for bright yellow and red shades. Generally all types of single jersey, double jersey and their derivatives are dyed by the following way. Generally, a dyeing process involves adsorption transfer of dyes from the aqueous solution onto the fibre surface and diffusion dyes diffused into the fibre. Reactive dyes are found in power, liquid and print paste form. A dye, which is capable of reacting chemically with a substrate to form a covalent dye substrate linkage, is known as reactive dye. To get an exact shade, you need to be pretty darn goodbut practice makes perfect. Reactive dyes are dyes used for dyeing protein, cellulose and polyamide fibre and they are anionic.

The packages are pressed up to a desired height to achieve suitable density of. Through a lot of experimentation, ive come up with some magical formulas to create the look of watercolor onto fabric by using dharma trading co. Removal of reactive red 24 dye by clean electrocoagulation process using iron and aluminum electrodes nasser m abu ghalwa, alaa m saqer and nader b farhat. Aside from the instructions below, one of our favorite bloggers gave it a go, and heres her experience. Garments dyeing garments dyeing process textile study. Environmentfriendly reactive dyeing process for cotton to. During dyeing, the reactive group of this dye forms covalent bond with fibre polymer and becomes an integral part of fibre. Coupling aniline to hacid gave the azo dye used in the first procion red c. Reactive dyes are most commonly used in dyeing of cellulose like cotton or flax, but also wool is dyeable with reactive dyes. The overall effect of urea on reactive dyeing is shown to depend upon the solvolytic stability of a dyefiber bond under specific dyeing conditions.

In the procion t series, marketed by ici in 1979, particularly for dyeing cotton in polyester and cotton blends by the thermosol process see above disperse dyeing, the reactive dye is bonded through a phosphonate ester. Electrolyte is must for exhaustion of dyes in the fiber. Mohammad zillane patwary knit dyeing is near similar as yarn dyeing process but there is some difference in quality measurement. Pdf improved reactive dyefixation in padsteam process of. Dyeing of cotton with vat dye part 01 textile study center. I have to tell you that ive never been able to see a difference between pfd and rtd fabrics after they are dyed. But now grey fabrics are dyed in required color after manufacturing.

The item may or may not be cut oversize to allow for shrinkage. The packages are pressed up to a desired height to achieve suitable density of packing. Pdf improved reactive dyefixation in padsteam process. The most important characteristic of reactive dyes is the formation of covalent bonds with the substrate to be coloured, i. Standard process using soda ash caustic soda exhaustion bath exhaustion alkaset aob. The overall procedure for reactive batch dyeing, which involves the three steps of dyeing, fixation and washingoff, is discussed in.

Dyeing property and adsorption kinetics of reactive dyes. Generally all types of single jersey, double jersey and their derivatives are dyed by the. Process flow chart of knit fabric dyeing with reactive dyes posted by textile fashion guide. The nature of the dyefiber bond is covered as well as the processes by which it is formed. The current reactive dyeing process for cotton involves alkali addition as a separate step in the dyeing. One type is for the cotton fibers, such as reactive, and one 1. There may or may not be thorough penetration of the colorant into the fibers or yarns.

Reactive dye is the dye that can react with a fibre to form a covalent link, that is forming a permanent attachment in the fibre and could not be removed by repeated treatment with boiling water under neutral conditions. Reactive dyes can also be applied on wool and nylon. The introduction of reactive dyeing not only provided a technique to overcome inadequacies of the traditional methods for. Improved reactive dye fixation in padsteam process of dyeing cotton fabric using tetrasodium n, nbiscarboxylatomethyllglutamate. Padsteam dyeing of cotton with reactive dyes using. Pdf dyeing of cotton fabrics using reactive dyes by microwave. Solution dyeing solution dyeing, known as dope or spun dyeing, is the process of adding color to the solution before it is extruded through a spinneret. Dyeing process the dyeing process is one of the key factors in the successful trading of textile products. The chemistry of reactive dyes and their application processes. Also, some steps of dyeing can be removed or some steps can be added for better dyeing efficiency.

The best guide to the dyeing performance of a reactive dye can be obtained from two sources of information. For example, a 100% cotton fabric can be printed with reactive dyes, vat dyes, or any dye that works for cotton. The raw yarn is wound on a spring tube to achieve a package suitable for dye penetration. Reactive dyes are found in powder, liquid and print paste from. Pdf the chemistry of reactive dyes and their application processes. This is followed by dyeing with reactive dyes in a conventional manner but without the addition of alkali to fix the dyes. The growth rate of reactive dyes for cellulosic fibers is expected to continue increasing, as shown in table 1. Novacron ls dyes are innovative bireactive dyes that require only 25% the salt of conventional reactive dyes. Reactive dyestuff dyeing method of reactive dye textile. Textile engineering, mehran university pakistan, 2003 diploma in colouration, society of dyers and colourists uk, 2007 c. It is more practical process which is done in the dyeing industry. They form strong covalent bond with the cellulosic fiber. Here the dye contains a reactive group and this reactive group makes covalent bond with the fibre polymer and act as an integral part of fibre.

In combination with alkali and heat, urea enhances cleavage of an ethertype dyecellulose bond, but has only a slight effect on an estertype bond. Reactive dyes have good fastness properties owing to the covalent bonding that occurs during dyeing. In addition to the design and beautiful color, the consumer usually looks for some basic product characteristics, such as good fixation with respect to light, perspiration and washing, both initially and after prolonged use. Here, i have given a discontinuous dyeing process by hot brand reactive dyes. Reactive dyeing is the most important method for the coloration of cellulosic fibres. Dyeing and printing are processes employed in the conversion of raw textile fibres into finished goods that add much to the appearance of textile fabrics. Pdf dyeing of cotton fabrics with reactive dyes using exhaustion method has been done using microwave irradiation technique. These softened packages are loaded on a dyeing carriers spindle one on another. A certain amount of dyes are hydrolyzed during application. The dye solution and alkali solution are typically pumped to the dye trough independently and mixed immediately prior to dyeing and there is often the use of a chiller to keep the dye liquors cool to minimise hydrolysis. It becomes an integral part of the fibre due to the formation of a covalent bond between the reactive group of this dye and the fibre polymer. Flow chart of cotton dyeing process textile flowchart. Consequently, the dyes become chemically part of the fiber. A dedicated textile fashion education informations blog knit dyeing is near similar as yarn dyeing process but there is some difference in quality measurement.

Cotton is dyed with a range of dye types, including vat dyes, and modern synthetic reactive and direct dyes. The dyeing process is one of the key factors in the successful trading of textile products. Us4806126a process for alkalifree dyeing and printing. Pdf technical facts of reactive dyes asad ali academia. Reactive dyes are the most popular for dyeing cellulosic fibers because of their outstanding characteristics, e. Reactive dyes are anionic dyes, which are used for dyeing cellulose, protein and polyamide fibres.

This is followed by dyeing with reactive dyes in a conventional manner. The process of dyeing fully made apparel product like tshirts, pants, trousers, shirts, jackets, tops, pullovers, dresses and bottoms is called garments dyeing. Used for difficulttodye, manufactured fibers such as olefin, and for. In addition to the design and beautiful color, the consumer usually looks for some basic prod. Reactive dyes are anaionic dyes which are used for dyeing cellulosic protein polyamide fibres. Process for alkalifree dyeing and printing with reactive dyes.

The item may or may not be sewn with cotton thread. They have better wash and light fastness properties. Most forms of textile materials can be dyed at almost any stage. Jan 12, 2016 dyeing vat dyes, textile dyeing industry an environmental hazard, textile dyeing process, textile dyeing machine,textile dyeing and finishing, textile dyeing. Beforehand, the textile material is treated with a wetting agent and a reaction product of polyethyleneimine and a bifunctional alkylating agent. Improved reactive dyefixation in padsteam process of dyeing cotton fabric using tetrasodium n, nbiscarboxylatomethyllglutamate.

Us4439206a dyeing process with reactive dyes and glycidyl. During dyeing, the reactive group of this dye forms covalent bond with fibre. Alternately, a cottonpolyester blend requires two dye types combined in the print paste. Garments dyeing garments dyeing process textile study center.