S03 AFTEX 3 2012 Dyes & Chemicals_Layout 1 07/09/2012 11:48 Page 12
DYES & CHEMICALS light fastness blue component is needed. Levafix Dark Blue CA also exhibits high colour fastness to ozone and nitrogen gases, coupled with good perspiration light fastness as in the NIKE PLF (ISO 105 B07) test. Levafix Dark Blue CA meets the requirements of many market challenges. The market requires satisfactory high performance with regard to colour fastness, ecological/toxicological issues and sustainability impact, as well as decreasing costs. Levafix Dark Blue CA provides the dyer with colour confidence in terms of its high colour fastness to light under different agencies, as well as providing controlled coloration performance. In addition, the reactive dyestuff is flexible from the viewpoint of application technology. Levafix Dark Blue CA is applicable by exhaust, cold pad-batch and most continuous dyeing processes. It offers balanced migration, level dyeing and very good reproducibility, high fixation on cellulosic fibres and good wash-off behaviour. In this connection, Levafix Dark Blue CA is suitable for the newly-developed Sera Eco Wash process developed by DyStar. This utilises an innovative textile auxiliary product, Sera Fast CRD, which is a wash-clearing additive that imparts a pronounced wash-accelerating action. This additive speeds up the removal of hydrolysed reactive dyestuffs at 60°C. This enhanced wash-clearing system saves on water, energy and processing time as well as exerting a major impact on machine productivity and on sustainability.
Tri-reactive dyestuffs Huntsman Textile Effects has introduced its Avitera SE range of tri-reactive dyestuffs for exhaust application to cellulosic textiles. Its use can be combined with Hutntsman's Gentle Power Bleach System developed jointly with Genencor enabling cotton to be bleached at 65°C under neutral pH conditions. Thus, low-temperature bleaching can be followed by warm ultra-short reactive dyeing using Avitera SE dyestuffs and using a high-performance wash-clearing additive Eriopon LT. As a result, wet processing is conducted at temperatures that never exceed 65°C. The Huntsman Textile Effects Avitera SE trichromat is based on Avitera Yellow SE (CI Reactive Yellow 217), Avitera Red SE (CI Reactive Red 286) and Avitera Deep Blue SE (CI Reactive Blue 281). Avitera Yellow SE is a nonphotochromic golden yellow, Avitera Red SE is a brilliant bluish-red and Avitera Deep Blue SE is a greenish-casted deep blue dyestuff offering good build-up on cellulosic fibres. Huntsman's Avitera SE reactive dyes are based upon novel chemistries and are particularly designed for the production of medium-to-dark shades. The high-aqueous solubility of the Avitera SE dyestuffs ensures that they are applicable via ultra-short dyeing and wash-off cycles. The wash-off process time is markedly decreased because of the high degree of exhaustion and fixation of the Avitera SE
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Dye manufacturers have introduced a series of dyestuffs that provide a brilliant colouring to polyamide, wool and their blends
Global competitiveness in textile dyeing, printing and finishing is highly dependent upon the economics of textile wet processing, machine utilisation and productivity. Embracing new technology is key to future survival and growth, and innovation in dyes and chemicals is important in this connection dyestuffs on cellulosic fibres. As a result, these novel reactive dyestuffs provide a drastic reduction in water consumption, savings in energy and other natural resources, savings in processing time and decrease in carbon dioxide emissions, ensuring cleaner production. Four new Drimaren reactive dyestuffs have been introduced by Clariant, namely, Drimaren Dark Blue HF-CD, Drimaren Blue K-RB, Drimaren Golden Yellow HF-CD and Drimaren Red CL-4B. Especially developed for application via cold padbatch and continuous dyeing, Drimaren Dark Blue HF-CD is also suitable for exhaust dyeing. This dyestuff is suitable for use as an element of the Drimaren HF-CD trichromat for medium-dark shades on cellulosic fibres. This dyestuff has high stability to atmospheric pollutants and also good colour fastness to light, chlorine and peroxide. The other blue reactive dyestuff, Drimaren Blue K-RB, is a brilliant blue suitable for royal
blue and violet shades when used in combination with Drimaren Red K-4BL or Drimaren Violet K2RL. Drimaren Blue K-RB and Drimaren Red CL-4B (which is a highly concentrated brilliant red dyestuff) are both suitable for all combinations with Drimaren HF/HF-CD elements and are applicable by cold pad batch, continuous and exhaust application methods. Drimaren Red CL-4B can be used as a trichromatic element for economical combinations such as Drimaren Yellow CL-2R, Drimaren Aquamarine HF-CD and Drimaren Dark Blue HF-CD. Drimaren Golden Yellow HFCD (Clariant) is a very highly-concentrated dyestuff that is suitable for all tones. It exhibits colour fastness properties and is a main trichromat element in the Drimaren HF-CD range. Drimaren Golden Yellow HF-CD can be applied via semicontinuous, continuous and exhaust methods providing a good dyeing performance. ❑
AFRICA AND MIDDLE EAST TEXTILES ISSUE THREE/2012