First of all, it is more important to control the PH value in the dyeing process to meet the process requirements. The choice of dyeing auxilia should be careful. For example, when using disperse dyes to dye polyester and its blended interweavers, the PH value can be adjusted to 5±0.5 by using 98% glacial acetic acid. When the dye solution heating or improper application of additives will make the dye solution PH value rise, resulting in the unstable PH value of the dye bath, if adding ammonium sulfate can stabilize the dye bath PH value, can also add ammonium dihydrogen phosphate.
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