Preparation before discharge printing
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1. Prepare the ink for discharge. The ink includes: a base, a pigment, an active agent, and other additives. The above ingredients are thoroughly stirred. The amount of preparation should ensure the amount of printing at one time. When adding the active agent, it must be carried out according to the manufacturer's measurement and mixing instructions. Otherwise, the discharge effect will not occur, and the pattern will not have a vivid color effect. The effective time of the discharge ink after the preparation is 8h, and the residual dyeing ink after the operation must be properly disposed and cannot be discarded. Screen printing inks must use screens made of water-resistant photosensitive adhesive.
2. Prepare the printing material. Not all fabrics are suitable for discharge printing. Cotton/polyester blended fabrics are not suitable for the dyeing process. The color dyes on the fabrics are different. When these fabrics are discharged, uneven bleaching effects are produced due to the difference in dyes.
In order to get the most vivid and uniform printing effect, 100% cotton cloth should be used. Such a cloth should be added to the bleaching process before dyeing in the manufacturing process, and printing with plastic melt ink does not require this process. Therefore, the emergence of discharge printing has also promoted the development of garment manufacturers that are suitable for discharge printing (special treatment). If a 100% cotton cloth that has not been bleached beforehand is used, it is not suitable to use the dye.
Printing a color pattern on the area of the normal cotton T-shirt discharge area will affect the dyed fiber after printing, so it is necessary to consider the color of each batch of dyed fabric itself. The only way to print a fine-grained color pattern is to use a cotton cloth that has been bleached.