The warp beam padding is mainly used in the production and processing of denim fabrics with white weft. It introduces a certain number of thin shafts into each dyeing tank, and after repeated multi-dip, multi-rolling, and multiple air oxidizing, dyeing of indigo (or vulcanization, reduction, direct, paint) dyes is realized. After pre-drying and then sizing, a uniform color warp yarn can be obtained, which can be directly used for weaving. The dyeing tank for warp beam padding may be a plurality of (sheet machine) or one (ring machine), and the device used in combination with the sizing yarn is called a sheet-like pulping machine.
This is also a special dyeing method for denim warp yarns. The dyeing process is to first bundle 400 to 500 original yarns into a spherical shape, and then dye several yarns (such as 12 bundles, 18 bundles, 24 bundles, 36 bundles) in multiple dyes. Repeated multi-dip, multi-rolling, and multiple air oxidization in the tank to realize the dyeing of indigo dye, and then divide and sizing. Acrylic tows can also be dyed by yarn bundles.
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