Npolyester yarn dyeing process pdf

Yarns are transferred from paper cone to plastic tube or spring tube for facilities the dyeing process. Fabrics can be dyed using a single or multiplestep process. Dye molecules are fixed to the fiber by absorption, diffusion, or bonding with temperature and time being key controlling factors. In this beginners guide for dyeing yarn and dyeing wool, im going to share with you the secrets i learned over many years of hand dyeing and working with various types of wool. Aside from the instructions below, one of our favorite bloggers gave it a go, and heres her experience. A cylindrical package of yarn wound on a flangeless tube.

In dope dyeing, pigments are added to the liquid polymer solution before synthetic fibers are extruded. Aqueous processes for dyeing generic, unmodified polypropylene. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Disperse dyeing is the usual choice of polyester dyeing. Fabric dyeing is the method afterweaving, knitting, or nonwoven to makefabrics. The process of applying color to fiber stock, yarn or fabric is called dyeing. Skein, package, beam, and space dyeing dyeing methods are used to dye yarns. Dyeing of texturised polyester yarn wiley online library. It is a process to remove the natural and artificial impurities in fabrics to obtain clear white for finished fabric or in preparation for dyeing and finishing. Solid, semisolid or tonal, gradated or ombre, variegated or multicolor, speckled or sprinkle dyed, self striping yarn. Now we recommend that a further dispersing agent is used during reduction clearing of the polyester yarn. Flow chart of isothermal yarn dyeing process textile. Skein dying is a way of dyeing yarn through dipping skeins or loosely wound hands of yarns into dye vats.

Realtime analysis and control of batch dyeing processes. By mixing a number of organic solvents in the dye bath, we can improve the structure of fibers and their deep dyeing. In skein dyeing the yarns are loosely wound into hanks or skeins and then dyed. Together with our biggest textile supplier, hilong in china, we transformed the textile dyeing industry by introducing a new fiber dyeing technique that cuts water consumption by 80%.

Dope dyeing is a production technique to colour synthetic fibers such as acrylic, nylon and polyester. One of the most commonly used yarn dyeing methods is package dyeing. Dyeing of cotton with vat dye part 01 textile study center. Theories of dyeing the describe the sorption or desorption process and the resulting dye fiber bonds using the tools of thermodynamics have increased.

Performance of dyeing and printing of polyester viscose yarns. Complete removal of waxes and lubricants of the fibers and yarns, will decrease the capacity of pilling formation, removing substances that favor the sliding of the fibers, and therefore the pilling formation. Work summarized in this final report covering three years of research includes. Dope dyed yarn is an environmentally friendly and efficient innovation in the dyeing process. Applied at the stage of preparing the yarn for dyeing, it allows you to pdftech com use the dyed. Dyeing process can be vary depending on the individual procedure of a textile engineer or a dyeing.

The raw yarn is wound on a spring tube to achieve a package suitable for dye penetration. A unit process or taught as such instead, dyeing has been regarded as a craft. 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. Pdf single and double bath dyeing of polyestercotton. Dope dyed polyester yarn for the future of textile industry. The packages are pressed up to a desired height to achieve suitable density of packing.

Dyed yarns are used for making stripe knit or woven fabrics or solid dyed yarn fabric or in sweater manufacturing. The very important dying process allows this kind of polyester to dye with polyamide and elastomer yarns at the same temperature. Dyeing of polyester yarn problems and solutions researchgate. The quality of the dyeing depends on the class of dye, process, method. Dyeing in textiles is a process that allows inserting a color to create a finished textile or textile material. Textile effluents are characterized by high chemical oxygen demand, biological oxygen demand, total dissolved solids, ph and colour. Nr groups yarn dyeing factory is facilitated with modern dying machines and technology that ensure colour consistency and colour fastness. Dyeingknit fabric, machine, shade, dyes and chemicals, flow process,fastness i. Process flow chart of knit fabric dyeing with reactive. The insolubility of disperse dyes enables them to leave the dye liquor. It is mainly suitable for cellulosic fibre for best overall fastness properties. The corporation is equipped with cylinder yarn dyeing machine ranged from 10 0 pounds for different order requirements. Recent progress in indigo dyeing of cotton denim yam. Process flow chart for 100% polyester dyeing textile.

Higher temperature steaming effects on the polyester yarn tenacity. Skilled management and technicians from overseas ensure quality and customer satisfaction. The influence of woven fabric structures on the continuous. Historically fabric, yarns, fibres or garments were. Yarn dyeing provides adequate color absorption and penetration.

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. Process flow diagram for dyed cotton yarn cotton yarn v winding on soft package v dyeing v drying v winding or reeling v quality control v packing v storage v market quality control and standards the cotton yarn is dyed as per the requirements of the owner. Yarn dyeing, which occurs before the cloth is woven or knitted, is used to produce gingham checks, plaids, woven stripes and other special effects. Preparation and drying 154 preparation 154 drying 155 17. The beam dyeing machine operates with the same principle as that of package dyeing and hank dyeing machines. Basi len blue ebgf is a brilliant blue dye free of he avy metals and stable under hi ghtemperature dyeing conditions e. The development of a truly aqueous process for dyeing pp in its generic, unmodified form is thus of. Project report on yarn dyeing manufacturing process. The occurrence of unfixed dyes and other electrolytes in effluents poses serious threats to the environment. Process flow chart of polyester dyeing disperse dyes dyeing.

Method of polyester dyeing polyester dyeing process. It is more practical process which is done in the dyeing industry. The company provides international quality cotton, polyester and filament yarn dyeing services and enjoys reputation as one of the best yarn dyeing houses in the country. Process control in dyeing of textiles sciencedirect. Chemical and physical changes in pet fibres due to exhaust dyeing.

The crosssection of the fibers allows moisture to evaporate away from the skin, in order to keep the foot cool and dry. Reactive dyeing instructions dyeing fabric is a delicate process with lots of moving parts. 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. Yarns used for knitting are typically processed this way. Also we can dye the yarn after yarn preparation and in fabric form. Heat setting is a term used in the textile industry to describe a thermal process taking place mostly in either a steam atmosphere or a dry heat environment. The dyeing of hydrophobic fibres like polyester fibres with disperse dyes may be considered as a process of dye transfer from liquid solvent water to a solid organic solvent fibre. If youve never thought about how the yarns we buy from stores and independent suppliers are dyed then we really urge you to look it up, because its an extremely interesting process. In the present study, we have used various cationic and reactive dyes in the dyeing process of leacril. Polyester staple fiber is made from special copolymers specifically for the production of socks.

Normally dyeing of polyester cotton blended fabric is dyed in two steps. Horizontal package yarn dyeing machine is best suited for silk yarn, nylon yarn, textured polyester yarn, acrylic yarn and other narrow fabrics. Because of the popularity of blue jeans, indigo is still one of the most important dye in the world in the present time. Technical information successful dyeing of polyester. Dieying dyeing is the system of including color to fabric merchandise like fibers, yarns, and materials. Generally, a dyeing process involves adsorption transfer of dyes from the aqueous solution onto the fibre surface and diffusion dyes diffused into the fibre. Setting up a team the team approach consists of multidisciplinary people who have experience or knowledge about the process and the product. Processes include scouring, bleaching, mercerising, dyeing and special finishes. It got listed in dhaka and chittagong stock exchanges through ipo in 1997. Acid dyes are highly water soluble, and have better light fastness than basic dyes. As its name suggests, yarn dyeing is the process of putting color into yarn before it is woven or knitted into fabrics.

Dyeing of polyester fabric with disperse dyes textile learner. Dyeing polyester elastane fabricsat reduced dyeing temperatures e. The purpose of this work is to investigate the influences of weave structure on dyeing of standard tencel fabric using reactive dyes applied by continuous dyeing methods. Methods of dyeing process of dyeing the chemistry of. Cationicdyeable polyester fibre is a special polyester fibre that can be coloured with cationic dye, unlike ordinary polyester fibres. The textile acid dyes are effective for protein fibers such as silk, wool, nylon and modified acrylics. 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. Soft winding section of yarn dyeing floor problems in soft.

Day by day the use of synthetic fiber increases rapidly. Instead of the usual piece dyeing, in which the yarn is knitted or weaved first into a fabric, which is then dyed as a whole, dope dyed yarn is the opposite. Blue dyed warp yarns, for example, are combined with white filling yarns in denim construction. Polyester is the most used synthetic fiber of the world. We used npropanol, isopropanol and benzyl alcohol as organic solvents. I made sure no food was out and used dedicated equipment for dyeing meaning that i never used dyeing utensils and pots for cooking, ever. Polyester fiber is having very compact and crystalline structure with no definite dye sites. Yarn dyeing opened up a whole new world of color for me. The other three hasi len fm dyes have high exhaustion and easy wash out propertics to. Aug 12, 2015 yarn dyeing is slightly difference from woven or knit dyeing. The process works like this, fabric or yarn in open width is rolled on to a perforated beam. The ability of one material to take up another material. Cationic dye is a special dye for acrylics, but it is very difficult in dyeing through the core. In particular, i will show you the basic yarn dyeing methods to achieve 6 distinct color patterns.

The fact that dyes in solution in the dye bath leave the bath and are sobned by the fibre yarn material during the dyeing process has been of interest to chemist and physicists for many years. The dyeing process does cause changes in the pet but these changes may be too small to. Oct 23, 2011 yarn dyeing is the method of dyeing yarnsin forms of hanks or packages dyeing. Polyester blend dyeing is exclusively done by high temperature high pressure hthp method 7. Mordant wool and put in dye until required depth of colour achieved. This process is used for dyeing polyester cellulosic fibre fabrics in jigger or winchbeck. These as well as other factors will be discussed in this document.

Reduction of color variation defects in polyester dyeing process proceedings of 23rd theiier international conference, singapore, 25th april 2015, isbn. In addition to the design and beautiful color, the consumer usually looks for some basic prod. Polyester is the most used fibre in the textile industry. Textile dying has a long history that dates back to 2600 bc. Fabric preparation steps, such as desizing, scouring, bleaching and mercerizing, use various chemicals and plenty of water. As the name suggests, the yarn itself is dyed to a preselected amount of colours, which are. Realtime analysis and control of batch dyeing processes keith r. These softened packages are loaded on a dyeing carriers spindle one on another. Polyester fiber has high tg and its dyeing is always carried above its glass transitional temperature. Design and development of yarn dyeing system in textile industry. Dyed yarns produce woven and knitted fabrics requiring colored yarns to create a design e. The yarns have good dye penetration, but the process is slow and comparatively more expensive. Pdf processing methods of polyester with deepcoloring.

This guide does not cover dry processing, carpet manufacture or wool scouring, although many of. This is used in hand loom weaving inthe northern and northeastern parts ofthailand. The lower liquor ratio used in jet dyeing allows shorter dye cycles and saves chemicals and energy. Modification of reduction clearing process of polyester. The dyeing of hydrophobic fibers like polyester fibers with disperse dyes may be considered as a process of dye transfer from liquid solvent water to a solid organic solvent fibre. Dyeing is the aqueous application of dyes on textile substrate1. Dyeing process the dyeing process is one of the key factors in the successful trading of textile products. Disperse dyes are added to water with a surface active agent to form an aqueous dispersion.

The common dyeing process of cotton yarn with reactive dyes at package form is as follows. Quality woollen goods are frequently dyed in the form of loose fibre, but top dyeing or cheese dyeing is favoured in treating worsteds. Dyeing is normally done in a special solution containing dyes and particular chemical material. Dyeing can be carried out on fibres, yarns or fabrics. Process flow chart of polyester dyeing disperse dyes. Nearpon to is a combination of non ionic and anionic dispersing agents which helps to remove more oligomers during the red uction clear process. In addition to the above fibers, caledonian is capable of dyeing polyester yarn that once woven can be marketed as bleach cleanable fabric. Kam hing international holdings limited yarn dyeing process.

It reacts with acetic groups, or mordants a chemical which can react or complex with a chromophore to form an insoluble color in the fibre. Dehydration and drying the bleached or dyed cylinder yarn will process centrifugal dehydration to reduce the rate of water contamination and is dried by radio frequency drying machine. Thiswill give scottishs style fabrics, carpet withmany colors and styles. The stock and yarn dyeing and finishing sector produces sewing thread and textile and carpet yarn. The other three hasi len fm dyes have high exhaustion and easy wash out propertics to decrease water usag. Also, it provides a longlasting effect of a bright, pure color of your choice. Dyeing of polyester fabric with disperse dyes textile.

Acrylic fibres, dyeing, zeta potential, adsorption, surface free energy. Ikea, they have introduced a new production technique to dye synthetic fibers, called dope dyeing. The fastness properties of polyester dyed yarn are excellent. These tests assess ch aracteristics such as the build up, levelling properties, rate of dyeing and temperature range properties of the. Yarn conditioning simultaneously work as heat setting that provides flexibility, better performance in onward process for all types of yarn. Abstract this study highlights the effects of the dyeing and printing processes on the tensile strength of blended suiting fabrics 65% polyester. Dyeing of polyester yarn is a difficult process as it is made from a thermoplastic polymer, which has highly crystalline structure. Generally all types of single jersey, double jersey and their derivatives are dyed by the following way. Dyeing and printing processes are valueadded treatments for most textile materials. Color, dyes, dyeing and printing 158 color theory 158 dyes and dye classification 164 dyes containing anionic functional groups 165 acid dyes 165 direct dyes 167 mordant dyes 168 reactive dyes 169 dyes containing cationic groups basic. Youre also probably aware, however, that many of the very best variegated and speckled colour ways are done through different methods of hand dying. Due to doped dyed yarns are created by adding masterbatch colourant to the polymer melt in spinning, it substitutes the most polluting process of dyeing in industries. Pdf kinetics of dyeing process of blend polypropylenepolyester. In practice, the price of a special leveling agent for acrylic fiber is high, and uniform staining is poor.

For, this disperse dyes are used for dyeing of polyester fiber from a stable aqueous dye dispersion. Here, i have given a discontinuous dyeing process by hot brand reactive dyes. The cost of double bath dyeing is quite higher than the one step or single bath dyeing. Problems with oligomer in dyeing polyester yarns and fabrics. In this article, we will explore the various colorways and patterns of hand dyed yarn and the techniques to achieve them. Most forms of textile materials can be dyed at almost any stage. There is nothing quite so rewarding as taking a plain, white skein of wool yarn, adding some yarn dyes and turning it into something magical. To get an exact shade, you need to be pretty darn goodbut practice makes perfect. Plant part mordant process all for wool colour apple and bird cherry bark alum 100g boil chopped up bark for 2 hours. There may or may not be thorough penetration of the colorant into the fibers or yarns. Yarn dyeing is slightly difference from woven or knit dyeing. Dyeing jute yarn with basic dye textile study center.

Pdf the dyeing of unmodified polypropylene pp fibres by the exhaustion method is. Knit dyeing is near similar as yarn dyeing process but there is some difference in quality measurement. High temperature high pressure method polyester dyeing process. It is suitable for acrylic fibers other fibers by mordanting. Kinetics of dyeing process of blend polypropylenepolyester fibres with. If we want, we can dye the fiber during yarn preparation. Types of commercial dyeing processes keycolour blog. Effects of solvent properties on cationic dyeing process of. Yarns are dyed in package form or hank form by yarn dyeing process. 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. Dyeing at high temperature of about c gives rapid dyeing, improved dye utilization, improved fastness properties, and makes possible the elimination of carriers which are required when dyeing at lower temperatures. Conventionally, however, they must be dyed at high temperature and pressure, making it difficult to combine them with wool, silk or other natural fibres that tend to lose strength and texture when subjected to.