Colour Chronicle - Sept 2012 - Clariant

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textile Orange and scarlet shades Golden Yellow HF-CD Scarlet HF-3G Red HF-3B What are the main problems faced by the continuous dyer? Shade transfer from lab to production. Shade reproducibility from batch to batch in production. Meeting modern retailer and brand house fastness requirements. Shade reproducibility from batch to batch in production. What are the main issues faced by the continuous dyer? Fabric appearance, penetration and levelling. Dyestuff solubility. Face to back shade variation (emerized fabrics). Shade continuity along the length and width of the fabric (tailing/listing). Dyestuff migration during pre-drying. Dyestuff stability to alkaline hydrolysis. Washing off and wet fastness. Photochromism. Fastness properties of the individual dyestuff. Improving fabric appearance, penetration and levelling with Drimaren ® HF dyes. Dyestuffs with high diffusion are essential for: Tightly woven fabrics. Fabrics constructed from high twist yarns. Mercerized fabrics. Regenerated cellulose, linen and cellulosic blends (CO:CV, CO:FL). Emerized fabrics (to improve face to back shade difference). Dyestuff stability to alkaline hydrolysis What can be done to minimize alkaline hydrolysis? Automatic liquor dosing systems (ratio 4:1). Low volume economizer trough (fast pad liquor turnover time). Increase the amount of sodium silicate in the pad batch process (70 ml/l / 38°Bé). Control of the fixation time and temperature. Control of the washing off conditions (mono VS dyes sensitive to alkaline washing). Cooling cylinders are used to cool and level out the fabric temperature before padding. Cooling water jackets around the pad trough are used to maintain the desired pad liquor temperature. Process water cooling systems for preparation of the dye and alkali solutions. Use reactive dyestuffs with high alkaline stability. Washing off reactive dyes Excellent wash and wet fastness properties can only be achieved by complete removal of the hydrolyzed dye, alkali and auxiliary chemicals during a washing off process. Very high fixation values. A high level of fixation is essential for good shade reproducibility, easier washing out of the unfixed dye and to minimize the amount of color that passes into the effluent. Brill. Yellow HF-RL .................. 96% Golden Yellow HF-CD ............... 96% Yellow HF-CD ............................. 92% Red HF-CD ................................. 90% Red HF-3B .................................. 97% Dark Red HF-CD ........................ 98% Aquamarine HF-CD .................. 90% Blue HF-RL ................................. 90% Dark Blue HF-CD ....................... 93% Royal Blue HF-CD ..................... 90% Navy HF-GN ............................... 95% Navy HF-B .................................. 97% Exchange Phase 1 > Diffusion & Desorption Phase > Exchange Phase 2 10 colour chronicle 3 | 2012
Who helped to make my favorite carpet so comfortable? title Clariant – Your partner for individual carpet procedures. As new challenges emerge, carpets must meet steadily rising requirements at home, in the office, in public areas, hotels, airplanes and cars. Carpets and textile ground coverings must fulfill technical requirements such as soil and water repellence or wear-resistance while also meeting the demands of color, design and comfort. This is where Clariant can help you. We are committed to developing products for individualized carpet applications that comply with international regulatory standards. Our innovative products and services, long lasting experience and technical know-how play a key role in manufacturing and treating, from spinning and dyeing to finishing. Clariant is close to you. Any time. Any place. Clariant Chemicals (India) Limited, Sandoz Baug, Kolshet Road, Thane (W) 400 607. www.clariant.in What do you need? colour chronicle 3 | 2012 11
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Page 9: textile Drimaren ® HF reactive dye
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Colour Chronicle - Sept 2012 - Clariant

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