By J N. Chakraborty
This publication discusses intimately the basics and practices of dyeing and shade of textiles. It covers educational in addition to business facets of color whereas additionally defining difficulties and offering ideas. it truly is of curiosity to researchers who learn technique and quality controls. New advancements and learn within the zone of dyeing, viz. dyeing of micro-fibre, garment dyeing and so forth have additionally been incorporated to maintain velocity with modern-day requisites. one other particular function of this booklet is that it's a concise compact textual content publication containing chemistry and alertness information of all periods of dyes.
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B) Cellulose acquires negative charge when dipped in water and dye acquires anion in bath resulting repulsion between dye and cellulose; the difference in potential of dye and fibre is called zeta potential. The potential barrier is overcome by introducing some extra heat energy into bath. (c) The pores of fibres are so small that it only allows entering a small single dye molecule. Direct dyes exist in solution as aggregates. With rise in temperature, these aggregates are broken down progressively to single molecules causing better penetration and higher diffusion of dye.
Due to the presence of two chlorine atoms, cold brands are more reactive, even dyeing can takes place at room temperature. indd 25 2/8/2014 6:22:46 PM 26 Fundamentals and Practices in Colouration of Textiles themselves with cotton through formation of covalent bonds, only when alkali is added to the dyebath to neutralise the acid which is formed during this bond formation process. Cl D O_Cell Cell-OH D 2 HCl _ O Cell Cl H dyes possess only one chlorine atom and so dye–fibre attachment takes place at one junction through formation of covalent bond.
In light theory, lights of all three primary colours (red, blue and green) are mixed to get white while black means absence of any colour; in textile colouration, a white textile having no colour on it looks white and dyeing of it with three primary colours (red, yellow and blue) at specific ratio develops a black with no specific λmax. Chemical technology deals with chemistry and suitability of a chemical for a specific dyeing process, it’s working mechanism, etc. The required chemical, if is short in stock either should be replaced by a second one to keep production schedule undisturbed or it should be prepared immediately.