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aqueous solubility of Avitera SE dyestuffs enables them to be applied at ultra-short liquor ratios. DyStar has expanded its range of Remazol Deep Black reactive dyestuffs with two new dyestuffs that offer enhanced colour strength and build-up characteristics. The two newly patented reactive dyestuffs are Remazol Onyx RGB and Remazol Midnight Black RGB. These dyestuffs exhibit high colour fastness to washing, very low staining on polyamide fibres in fibre blends (e.g. cotton / polyamide) as well as offering good washing off performance and white dischargeability. Both these new black dyestuffs can be applied by the exhaust, cold pad-batch and continuous application methods. Remazol Onyx RGB is a neutral black while Remazol Midnight Black RGB is a greenish black and both dyestuffs fully comply with the Oeko-Tex Standard 100 and are AOX (absorbable organohalide)-free and metal-free. Archroma (formerly Clariant) has introduced a range of dyestuffs that can be applied by its Advanced Denim technology to expand the spectrum of colours other than blue. Archroma’s Advanced Denim Technology was originally based upon their Diresul RDT dyestuffs. However, they launched a new range of six Optisul C dyestuffs in Paris at Première Vision which are designed to provide soft denim colours via a continuous dyeing method. The Optisul C range are said to be affinity-free and sulphidefree dyestuffs which meet both GOTS and bluesign 1 criteria. Combinable with each other at low concentration they enable denim to be dyed in a wide colour gamut of easy to achieve reproducible soft colours. Avocet Dye & Chemical Company Ltd, UK, has introduced a new navy dyestuff to their metalfree Cetalan AV range. Cetalan Navy AV RLD complements the range which now consists of 12 dyestuffs covering a wide colour gamut. Cetalan Navy AV RLD and another new dye Cetalan Dark Red AV D are designed for use in the wool or wool/nylon carpet sector, but can also be applied in wool fabric dyeing. Cetalan Navy AV RLD enables textile dyers to achieve deep rich colours while still offering good colour fastness to light and washing. The Cetalan range of dyes are an economic range of dyestuffs enabling dyers to achieve deep colours while still meeting exacting environmental and ecological standards. DyStar has introduced two new reactive dyestuffs, Levafix Amber CA-N and Levafix Red CA-N. The former is a non-photochromic yellow that DyStar recommends for ternary pale-tomedium depths of colour. Designed as a replacement for Levafix Amber CA this new dyestuff offers significantly less staining on polyamide fibres. Levafix Amber CA-N offers high colour fastness to both peroxide and chlorine. Levafix Red CA-N is a bluish-red dyestuff suitable for medium to dark shades, an excellent partner for trichromatic combinations and an
alternative to Levafix Red CA. Both these new Levafix Amber CA-N and Levafix Red CA-N reactive dyestuffs are applicable via exhaust or continuous dyeing processes, are AOX-free, metal-free and meet full compliance with OekoTex Standard 100 and all Restricted Substance Lists. Additionally Levafix Amber CA-N can be utilised in cold pad batch dyeing processes because of its balanced migration behaviour which provides very good reproducibility and levelness of dyeing. A new green vat dyestuff from DyStar is Indanthren Green CLF Coll, which has an optimised particle size to provide the best migration properties. This vat dyestuff provides outstanding reproducibility as well as a level and unique shade on polyamide/cotton fabrics. Indanthren Green CLF Coll provides a new basis for high colour fastness green shades wherein the major part of the green colour is not provided by blue and yellow dyes. For continuous dyeing DyStar recommend the use of Sera Gal MIP, for exhaust dyeing Sera Sperse C-SN and for two-phase printing Sera Print M-CAM.
Dyeing Auxiliaries DyStar’s Remazol RGB and Remazol Ultra RGB reactive dyestuff technology is now complemented by a novel wash-clearing auxiliary that is used in DyStar’s Sera Eco Wash process. SeraFast GRD provides an accelerated wash-clearing action, the auxiliary having been especially formulated to speed up the removal of hydrolysed/unfixed reactive dyestuffs. The Sera Eco Wash process shortens the wash-clearing process at 60°C, thereby saving on water, energy and processing time. In this way machine productivity and process sustainability are enhanced. A new diffusion accelerator for enhancing aqueous-based disperse dyeing of polyester fibres has been introduced by Rudolf Chemie. Suitable for dyeing both polyester and polyester blends, Rucogal ERL is a non-ionic product based upon a fatty alcohol ethoxylate and fatty acid ester. Rucogal ERL is a self-emulsifying liquid product that can be added directly to the dyebath and is low foaming. Rucogal ERL provides excellent levelling effects and is suitable for correction of unlevel dyeing because of its superior levelling performance. This dyeing auxiliary is resistant to water hardness problems and acids under normal dyehouse conditions and imparts good colour-intensifying effects even when applied at the boil. It is applicable in all types of dyeing machinery. Bozzetto Group has introduced a new carrier, Cindye DNK, for the dyeing of aramid fibres to very dark shades, which are normally extremely difficult to achieve because of the compact high crystalline fibre structure. Dyeing of aramid fibres can thus be carried out using basic dyestuffs, a strongly acid pH and Cindye DNK which provides the accelerated diffusion of dyes within the aramid fibres, with a consequent increase in both the rubbing and wash fastness. ❑
AFRICA AND MIDDLE EAST TEXTILES ISSUE TWO 2014
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