• Document: A novel reactive dyestuff range with excellent color yield in Continuous and Cold Pad-Batch dyeing
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A novel reactive dyestuff range with excellent color yield in Continuous and Cold Pad-Batch dyeing Bao-Kun Lai, Wen-Jang Chen, Jung-Fang Yeh Everlight Chemical Industrial Corporation 6th Fl, 77, Tun Hua South Road, Sec. 2, Taipei, 106, Taiwan Summary : Since their introduction Everzol ED dyes have gained rapid and worldwide acceptance. The dyes display good build-up, economy and ECO efficiency. This article describes how these particular technical features of the Everzol ED range have been successfully applied to the cold pad-batch and Emoistfix processes, to satisfy consumers’ demands for higher productivity and competitiveness. The future change of textile dyeing and finishing industry On Jan 1, 2005, textile quotas were lifted. As well as the need for high quality, low cost and reliable delivery, products with quick response to customers’ requirements will be increasingly demanded in the printing and dyeing industry. Under pressure from rising costs in manpower, water, energy, complicated production technology and high waste water treatment, the printing and dyeing industry has invested heavily in equipment for continuous and cold pad-batch dyeing. Thus, in order survive tight environmental and competition pressures, the dyeing and printing industry has already moved partially towards the cold pad- batch and Emoistfix processes, with their reduced production costs, good dyeing quality allied with high productivity and lower effluent. Demand for reactive dyes in printing and dye markets The industry has already moved largely from traditional patterns, for example time-consuming processes, to right-first time production, high reproducibility and increasingly to products and processes with environmental and ecological benefits. Ultimately the design of reactive dyes will be directed towards non- toxic, easy waste water treatment, high fixation, high color yield, easy washing off and low energy consumption. The Everzol ED ranges are designed to meet these requirements, providing a route to reduced production costs and improved ecological performance. A novel reactive dyestuffs range Everzol ED dyes were first developed by Everlight Chemical Industry Corporation in 2000 and have since gained widespread commercial acceptance. They show excellent build-up, economy and Eco efficiency in customer’s dyehouses. Additionally, Everzol ED dyes have been applied to pad dyeing, in order to satisfy customers’ demands, especially in cold pad-batch and continuous dyeing. Furthermore, Everzol Yellow ED, Everzol Yellow ED-R, Everzol Red ED, Everzol Red ED-2B and Everzol Black ED are inventions of Everlight R&D which have been patented and notified in the EU. Customers can expect to satisfy the demands of dyeing industry with excellent dyeing properties and fastness, coupled with productivity and competitiveness. In the past few years, the dyeing industry has invested heavily in equipment suitable for cold pad-batch and Emoistfix dyeing, especially in Europe and Turkey. This article will illustrate the application of Everzol ED dyes to these processes. Features of Everzol ED ranges in continuous dyeing and cold pad-batch Everzol ED dyes are suitable for continuous dyeing procedures with the main outlets, at present, being cold pad-batch, pad-dry-chemical pad-steam, pad-dry- baking, etc. Meanwhile, in the light of new dyeing technology, such as the Emoistfix process, Everlight Group has further investigated Everzol ED dyes in these application processes and excellent dyeing results have been obtained. Everzol ED dyes exhibit the following features and advantages in continuous dyeing and cold pad-batch: Simple dyeing operation Same operation methods with conventional dyes used in cold pad-batch, excellent compatibility with the Everzol C range. Low cost of dyestuffs Half the usage of dyestuffs compared with conventional dyes applied in cold pad-batch. High color yield and fixation Everzol ED ranges display outstanding build-up compared with conventional dyes. Low waste after dyeing Less unfixed dye remains in the waste stream. Excellent reproducibility Consistent dyeing results under a wide variety of dyeing conditions. The application and dyeing conditions for cold pad-batch and Emoistfix process are described below: Cold pad-batch dyeing Three kinds of alkalis are recommended in the cold pad-batch method: Method A, silicate free Everzol ED Dyestuff(s) X g/ℓ 0 38 B'e NaOH 8+X/5 ml/ℓ Glauber’s salt ( Neutral salt) 30 g/ℓ Method B, Sodium silicate Table 1: Chemical consumption with sodium silicate Everzol ED dyestuff usage Na2SiO3 <=20g/ℓ 30g/ℓ 40g/ℓ 50g/ℓ 60g/ℓ

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