Pseudo single-bath process for ambient temperature bleaching and reactive dyeing of jute

Abstract

Grey jute fibre has been bleached at ambient temperature using hydrogen peroxide and then cold dyed with Procion Red M8B and Remazol Yellow FG dyes by four different process sequences, namely conventional two-step process, true single-bath process, pseudo single-bath process and pseudo single-bath process using spent bleach bath. The effect of process sequences on colour yield of dyed jute fibre has been evaluated using computer colour matching system. It is observed that the colour yield by pseudo single-bath process is well comparable with that of the conventional two-step ambient temperature bleaching and cold reactive dyeing process. It is also observed that the colour yield is maximum in case of pseudo single-bath process and minimum in case of true single-bath process. The process of dyeing has no effect on λ_max value which confirms no alteration in the hue and tone of any sample dyed with reactive dye by different single-bath processes. The wash fastness is satisfactory in all the processes.