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          Fiber Dyeing Process – Soaping
          Jul 21, 2018

          By washing thoroughly and soaping agent, it can wash away the hydrolytic and unreactive dyes remaining on the surface of the fiber efficiently. When soap is added, it should be added with less chelating dispersant, which can purify the water quality and prevent the two stain of the floating color to the fiber, thus improving the color fastness. The dark color cotton should be boiled with neutral soap first. The initial washing and soaping can improve the fastness. But with the increase of washing times, the dyed dyes will be destroyed and the bond is broken, and the effect of improving the fastness will be weakened. It is necessary to use acetic acid to neutralize after soaping.

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