basics of dyeing - what is dyeing

DYEING The application and fixing of a dye to a substrate, normally with the intention of obtaining an even distribution through out the substrate. There are three types of dyeing : 1. Fibre dyeing. 2. Yarn dyeing. 3. Fabric dyeing: a) Woven dyeing. b) Knit dyeing. Bleaching Dyeing Hydro extraction Grey Yarn inspection Batching & Loading Soft Winding Hard Winding Scouring Drying Final InspectionDelivery Desizing Scouring Bleaching Printing Grey fabric inspection Brushing Stitching Mercerizing Singeing Dyeing Scouring Bleaching Printing Mercerizing Dyeing Finishing Final inspection Delivery Scouring Bleaching Dyeing Printing Grey fabric inspection Singeing Batching Final Inspection Mercerizing Finishing Delivery Successive stage of Dyeing Dye is diffused in the fibre Dye is dispersed in the dye bath Dye in the electrical double layer Dye in the diffusion layer Dye is absorbed on the fibre surface Bond formation between dye & fibre + - + - + - + - + - + - + - + - + - + - A B Diffusion layer thickne ss Distance of fibre surface from AB Diffusion layer Electrical double layer Fibre Dye molecule According to method of application:  Direct dye  Reactive dye  Vat dye  Azoic dye  Sulphur dye  Basic dye  Acid dye  Disperse dye According to the chemical structure:  Azo dye  Indigoid dye  Anthraquinone dye  Polymethine dye  Styryl dye  Nitro & nitroso dye  Phthalo cyanine dye  Aryl carbonium dye [...]... process 3.Discontinous process:  Winch  Jet  Jigger 4.Pad Dyeing Processes:  Pad roll process The goal of every dyeing is a colored textile in the desired shade, homogeneous in hue and depth of shade, produced by an economic process and which exhibits satisfactory fastness properties in the finished state Basically there are three methods of dyeing textiles: 1) Mass dyeing: dyeing of a synthetic... Dispersing agent  Anti creasing agent  carrier Two types of dye application techniques exist: 1) Direct application of dye liquor by spraying, foam application, or printing 2) Continuous immersion of the fabric in a dye bath and removal of the excess of liquor by squeezing or suction (padding) 1.Continuous dyeing processes  Pad dry process  Pad steam process 2.Semi continuous processes  Pad-batch... position of the dyeing equilibrium, which at room temperature is shifted strongly toward adsorption on the fiber Colored textiles are produced today on a large industrial scale Although modern automation techniques have been introduced for color measurement, metering of dyes and auxiliaries, and automatic control of the dyeing process We would like to express many thanks to our honorable teacher Prof Dr... electrolyte (i.e., sodium chloride or sodium sulfate), its concentration, and the speed of addition control the adsorptive behavior of the dyes and the degree of exhaustion A high electrolyte content of the dye bath shifts the dyeing equilibrium toward the fiber  The pH value influences solubility, substantively of the dyes, and their stability in the dye bath Lower pH values improve exhaustion; however,... textiles: 1) Mass dyeing: dyeing of a synthetic polymer before fiber formation 2) Pigment dyeing: affixing an insoluble colorant on the fiber surface with a binder 3) Exhaustion dyeing from an aqueous bath with dyes that have an affinity for the fiber  The liquor ratio influences the dye solubility and the strength of the electrolyte effect Lower liquor ratios are employed whenever possible, for ecological,... thanks to our honorable teacher Prof Dr Zulhash Uddin giving us a very good opportunity for presenting ourselves We also thanks our parents who encouraged us every step of our life Lastly thanks all of you who are give kind attention for this presentation ceremony  . fibre surface Bond formation between dye & fibre + - + - + - + - + - + - + - + - + - + - A B Diffusion layer thickne ss Distance of fibre surface from AB Diffusion layer Electrical. Inspection Mercerizing Finishing Delivery Successive stage of Dyeing Dye is diffused in the fibre Dye is dispersed in the dye bath Dye in the electrical double layer Dye in the diffusion layer Dye is absorbed. dyeing : 1. Fibre dyeing. 2. Yarn dyeing. 3. Fabric dyeing: a) Woven dyeing. b) Knit dyeing. Bleaching Dyeing Hydro extraction Grey Yarn inspection Batching & Loading Soft Winding Hard Winding Scouring Drying Final