Pad-dry-cure method (Part 1)
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Pad-dry-cure method (Part 1)
Some reactive dyes are padded onto cotton in the presence of sodium bicarbonate and urea. The urea acts as a humectant providing moisture to the fiber that aids dye fixation. However, a concern associated with this process has been addressed through the E-control process. In this process dichlorotriazine dyes are applied using only sodium bicarbonate, as no urea, salt, sodium silicate or other chemicals are required. By maintaining the relative humidity content at 25% in the dryer, the latter chemicals can be climinated. The E-control process involves padding dye and alkali, drying for 2 minutes at 1200C, and then washing off unfixed dye. Color yields by this process are higher than in other continuous methods. The challenges associated with this process include the a curate measurement of humidity in the dryer and the ability to maintain the required level consistently
