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nature : fiber yarn, thread or fabric dyeing process, in order to encourage stained uniform, not produce color, pigmentation defects and adding other substances. There are two types : the pro-fiber type and the pro-dye. Former right fibers have some affinity, in the process of dyeing and will compete with dye and then gradually being replaced by Dye played the role with ease. It is used by some anionic surfactant, such as fatty alcohol sulfates. The other type of dye and dye absorbed into the bath President into a kind of "composite" in the process of dyeing and gradually release the dye to achieve the leveling effect. This kind of material that some non-ionic surfactants, such as alcohol or Alkylphenol the polyoxyethylene ether.
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