Asaye Dessie Wolela*
This paper presents equilibrium dyeing which is important in the dyeing process. The paper gives more emphasis on the dyeing equilibrium which is the position of sorption versus desorption after infinite time. In dyeing process, the investigation of the equilibrium dye distribution between the dye bath and the substrate is very important. The thermodynamics of dyeing of different textile fibers with their respective dyes type were discussed. Furthermore the three major types of dyeing adsorption isotherms, which are Nernst, Langmuir and Freundlich and the various dye/fibre systems correspond to one of these types. The most important thermodynamic parameters such as affinity, heat of dyeing and entropy of change which is determined at equilibrium have been also discussed. These values are useful in interpreting the driving force for dyeing processes and therefore provide a means for understanding what causes dye to transfer preferentially from the dye liquor into the fibre.
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