Bleaching and dyeing cotton with a shorter process

Conventional processing for reactive dyeing of cotton is explained, comprising bleaching, dyeing and rinsing. These processes occupy over 60% of total processing time and use most of the water and energy. Short cuts are summarised, based on Fong's GN6-Super high temperature (HT) dyeing machine, reducing the complete dyeing process to 4-5 hours. Multi saving rinsing (MSR) and multi-function intelligent rinsing (MIR) are examined. High temperature bleaching technology is explored with the improvements which can be achieved at temperatures of 105-130°C for 5-20 minutes. Constant temperature dyeing is discussed with five recommended machinery characteristics listed. The continuous rapid rinsing technique is explained with three rinsing phases - drainage, dilution and diffusion. Methods of reducing the residual concentration (CR) in a dyeing machine and achieving the required cleaning effect are listed. It is concluded that new bleaching and dyeing technology with the GN6-Super can reduce time, and electricity, water and steam consumption.