vat dyeing process pdf

These particles dissolve in the water and thus the transport of the dye into the solid substrate takes place in a similar manner to that of water-soluble dyes. is a platform for academics to share research papers.

Vat dye is soluble only in reduced (oxygen-free) form and the cotton fibers are immersed into the dye-bath in this reduced state. The packages are curiously named, some according to their shapes; for example, cones, cheeses, cakes, beams, and rockets. Fastness to other agents, among them water, bleach, acid, alkali, detergent solution, and perspiration, is measured on a scale of 5. Hence, for most vat dyes no reduced stock solution is available in the market to use in denim fabric production. Several reasons for errors and irreproducible dyeing can be found, including a lack of quality control during the dyeing itself and also in the preceding textile-finishing processes. Jet dyeing machine for dyeing processes in exhaustion technology. In particular, the darker shades of textile material of this invention may be used to produce clothing garments such as pants, skirts, shirts, hat, or jacket.
TUNCER, MUSTAFA, ESREF, Inventor name: The method according to claim 1, wherein said continuous process is any of the following: rope dyeing process, a slasher dyeing process, a loop dyeing, or a continuous fabric dyeing process. T, Ref document number: Aims, principles and ecological requirements for dyeing processes. In this, the cloth is padded with the pigment dispersion and then, while still wet, it is padded again with the alkaline hydros solution. Specific examples of colors or garments should not limit the scope of the invention. The dye liquor is circulated by an impeller and moves through a perforated false bottom that also houses the open steam pipe for heating. In yet another embodiment of the present invention, the treatment unit may further include milling and/or an ultrasound apparatus. Set alert.

Its dyeing process are given below: The required water for dyeing is taken in the dye bath and it is maintain at proper temperature (50º- 60 ºC) the reducing and dyeing temperatures vary from dyestuffs to dyestuff. Predrying is to control migration of the pigment particles to the yarn surfaces where water is evaporating. 250 ml volume solution is prepared by adding these chemicals to distilled water. 67300), Vat Orange 15 (CI.

Furthermore, it should be noted that the parameters in this list are not quite independent, and in some cases the effect of two of these factors may be considered as one effect. DE, Free format text: As a result, sufficient and uniform preparation and pretreatment can make the dyeing quality more controllable and predictable. Quality woollen goods are frequently dyed in the form of loose fibre, but top dyeing or cheese dyeing is favoured in treating worsteds. This stage to a large extent defines the uniformity of colour of the end-use product. 69025), Vat Blue 6 (CI.

It deals with the Registration, Evaluation, Authorisation and Restriction of Chemical substances. The reduced form of indigo vat dyes The dyeing process of textile substrates comprises four stages (Choudhury, 2006): Transport of the dye molecules from solution to the substrate surface. Hydrogen bond strengths vary considerably; in the case of the hydrogen bond between neutral molecules they are in the range 10–65 KJ mol− 1 and when one of the components is ionic this range rises to 40–190 KJ mol–1. The method according to claim 9, wherein said washed or worn look is achieved via any of, or a combination of, the following processes: stone washing, enzyme washing, bleaching, acid washing, resin treatment, ozone washing, neutralization, tinting, local tinting, chemical spraying, local bleaching, sand blasting, brushing, laser, moustache or whiskers, damage and cutting. The heating should be as uniform as possible. wool:silk:nylon = 23:4:1. The water quality for dyeing and printing is very important (Yeung and Shang, 1999), and it must meet the requirements as listed in Table 13.3. Function of auxiliaries:eval(ez_write_tag([[728,90],'textilestudycenter_com-large-mobile-banner-1','ezslot_10',600,'0','0'])); Na2S2O4 +H2O                2NaHSO3+ 2[H]. In order to achieve the required dyeing or printing quality, all factors that may influence the dyeing or printing process must be precisely controlled (Table 13.2). This leads to a variety of possible dyeing methods, some of which are described below. For some purposes, high lightfastness is essential; but for others it may be inconsequential. Each reaction unit has a residence/retention time (hereinafter referred to as RT) that is a function of reaction unit volume, flow rate, and mixing parameters depending on reaction unit design. Each of the six steps can influence the levelness of dyeings.19 A complete quantitative analysis of the effects of many factors which influence the levelness of dyeing would require the development of a mathematical model involving a significant number of parameters. Fibre surface here is understood not only as the outer visible surface of the fibre, which is defined by fibre diameter and fibre length, but also as the surface of pores which may penetrate deep into the fibre interior. This prevents ending in jig dyeing.
The most important dye applied in dyeing and printing.

Van der Waals forces (the attractive forces between the atoms or molecules of all substances) are thought to act in the dyeing of cotton between the molecular units of the fibre and the linear, extended molecules of direct dyes. They are applied to cellulosic fibres, wool, or silk after such materials have been treated with metal salts. 3. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL:, URL:, URL:, URL:, URL:, URL:, URL:, URL:, URL:, URL:, Modelling, Simulation and Control of the Dyeing Process, Dyeing and printing processes are value-added treatments for most textile materials.

Today, the production of yarns with ring effect dyeing is feasible only through a few continuous processes. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) 67000): The dye composition in the dye tank was made in the following order. The present invention provides for a method and apparatus to use all vat dyes, regardless of the solubility, in a continuous process for textile material.

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