Effect of pressure of supercritical carbon dioxide on morphology of wool fibers during dyeing process

Abstract

In this paper, the effect of pressure release rate on dyeing of wool fibers was studied in the supercritical carbon dioxide dyeing. Surface morphology, chemical composition and color difference at different pressure release rates were investigated by employing scanning electron microscope, color matching, and measuring instrument. Experiment data reveal that wool fibers are easy to be damaged with increasing pressure release rate. Fiber's surface brightness varies also with the pressure release rate. The phenomena are theoretically explained using Bernoulli's principle.