Many people always like to confuse dyeing and printing, but in fact there are obvious differences between the two. Here, let us give you the difference between dyeing and printing. Printing is a kind of local dyeing. Therefore, when the same type of dye is used for printing or dyeing, the physical and chemical properties of the used chemical aids are similar. The principle of dyeing and fixing of the dyes used is similar. The dyes are in the fiber. The same should have all the color fastness that the fabric should have during the course of use, which is the common point of printing and dyeing. The difference between dyeing and printing (1) Staining solution is generally not added thickening paste or only a small amount of paste, and printing paste generally have to add more thickening paste in order to prevent the pattern of osmotic patterns caused by unclear Distortion and prevention of dye migration during drying after printing. (2) The dye concentration during dyeing is generally not high, and the problem of dye dissolution is not so large, so the cosolvent is often not added, and the dyestuff concentration of the printing paste is high, and more paste must be added in the paste. It is difficult to dissolve the dye, so it is often necessary to add more cosolvents. For example, urea, alcohol, dissolved salt B, etc. (3) When dyeing (especially dip dyeing), the fabric has a longer action time in the dyeing bath, which allows the dye to fully diffuse and penetrate into the fiber to complete the dyeing process. During printing, after the paste added in the paste is dried to form a film, the polymer film affects the diffusion of the dye to the fiber, and the diffusion rate of the dye must be increased by means of post-treatment steaming, baking, etc. to help the dye. Dyed with fiber. (4) Dyeing is rarely done with two different types of dyes (except when blending fabrics), and printing is often done using different types of dyes for common printing or even pulp printing. In addition, there are various processes such as discharge printing, anti-stain printing and anti-imprint printing, so the printing process design is different from dyeing. (5) Printed fabrics have white prints, or white and white prints. Therefore, semi-finished products of printed cloth are required to have a whiteness similar to that of semi-finished bleached fabrics. Lower. (6) Semi-finished dyed fabrics require a good capillary effect to facilitate diffusion and penetration of dyes into the fibers during dyeing. When the printed cloth is processed, the printing and drying are continuous, and are usually completed within a few seconds at the same time, and the pattern at the printing site is required to have uniform color, clear outline, smooth lines and continuous lines. Therefore, the semi-finished products of the printed cloth not only require a good capillary effect, but also require a uniform and good instantaneous capillary effect, so that the fabric can be printed at the printing pattern at the moment of printing by means of the capillary effect. Color paste "according to single receipt." The difference between dyeing and printing First, the differences between dyeing and printing are as follows: 1. The print is better than the dyeing on the defects of the fabric . 2. The weftiness requirement of semi-finished products on printed fabrics is particularly strict. 3. Dyeing and printing may have special requirements for the same type of dye. 4. Dyeing and printing require different pre-processing requirements for semi-finished products. (such as whiteness, gross effect) 5. Staining solution without or with a small amount of thickening paste, printing paste plus more thickening paste. 6. Dye penetration is sufficient for dyeing. When printing, the dye is not easy to diffuse penetration, steaming or baking. 7. Dyeing solution, the dye is easy to dissolve, no auxiliary solvent. Printing paste, add more co-solvent. 8. Dyeing is rarely done with two different types of dyes. Different types of dyes are often used for printing. Second, dyeing and printing have the same three points: 1. The same type of fiber, if dyed and printed with the same dye, can have the same color fastness. 2. The physical and chemical properties of the chemical additives used are similar. 3, the application of dyes dyeing, fixing principle is similar. waterproof zipper waterproof zipper Jiangmen M.F.B.S. Machinery Ltd. , https://www.newpowerhk.com
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