Abstract
It is well known that, conventional hydrogen peroxide bleaching process is an important and a specific step for wet processors; however it has some problems such as long time, high energy consumption. On the other hand, using ultrasonic energy in bleaching is an alternative method for the conventional processes.In this work, 100% cotton materials of different forms such as raw fibre, ring-spun yarns and knitted fabrics produced from these cottons, were treated with hydrogen peroxide in two different concentrations (5mL/L and 10mL/L), at three different temperatures (20°C, 30°C, 40°C) and times (20min, 30min, 60min). Whiteness Index of the samples were then measured spectrophotometrically and the overall results were compared.
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