Printing is actually a partial dyeing, so the dye fixing principle of printing is similar to dyeing. But printing pays attention to the effect of the pattern. In large-scale production, the printing process has many characteristics. The following description will be introduced by Bedding Twill Printed Fabric Factory.
(1)Printing uses the original paste as the medium. In order to stabilize the pattern and prevent the pattern from seeping in the printing process, nearly half of the original paste should be added to the printing paste; and the dyeing medium is usually water.
(2)Co-solvents are often added to printing pastes. Due to the thick requirements
of printing pastes and the small amount of water, it is difficult to dissolve
the dyes. It is often necessary to add co-solvents such as urea and dissolved
(3)The fixing time is short and the temperature is high. The process of making printing dyes dye fibers under high temperature is called evaporation. When printing Plain Printed Cotton Fabric, the dyeing of printing dyes needs to go through several processes of "seal film hygroscopic expansion-dye redissolution-dye transfer-dye dyeing", and the entire steaming process should not take too long, otherwise the pattern The sharpness of the outline is affected. Therefore, high temperature methods such as steam and baking are often used in production to speed up the diffusion of dyes, help dyes dye fibers, and shorten the steaming time.
Plain Printed Cotton Fabric
(4)Vat dyes need to be screened. Printing is local dyeing. When the same type of dye is used for the same fiber fabric, the printing and dyeing principles are the same, and the color fastness is the same, but not all dyes can be used for printing. In view of the printing pattern, the stability requirements of the color paste, and the particularity of the steaming and washing environment. Printing requires different dyeing requirements than dyeing.
(5)Semi-finished products require high pre-treatment. This is mainly reflected in three indicators: whiteness, instantaneous hair effect and weft skew. For the direct printing process, in order to make the white ground clean and highlight the vividness of the flowers, semi-finished products are often required to have good whiteness, especially in the anti-discharge printing process. Secondly, the printing process is short in time and requires uniform color of the printed pattern. , The outline is clear, the lines are clean, and the stem cannot be broken, so the semi-finished product should have a better capillary effect, especially it should have a good instantaneous capillary effect, and the hair effect is uniform, so that the fabric can quickly absorb the color paste and reduce the paste. Defects occur; the printing effect is irreparable due to the existence of the pattern, so the weft slope of the semi-finished product must be low to ensure the regular printing pattern.
(6)The requirements for washing after printing are high. Unlike water washing after dyeing, after printing, the original paste should be removed by water washing to restore the fabric feel and remove floating colors to improve the color fastness of the product. Dyeing products require uniform color, while printed products require clear flowers, bright colors and clear outlines. In the washing process after printing, the floating colors of dyes of different colors are washed and entered into the washing liquid together, which easily causes the fabric to be stained in white and the color is not pure, that is, stained. Therefore, the main points of water washing quality control are: strengthen water washing, remove original paste and floating color, prevent water staining, and protect fabric strength.
(7)The printing process is long. Such as printing Interlining Cotton Printed Plain Fabrics. Therefore, engaging in printing work has a wide range of knowledge, high technical content, difficult quality control, and strong challenges. It requires printing workers to have a strong sense of quality, rigorous work attitude, a high degree of global conception, and excellent skills. Professional theory and expertise.
The above are the technical characteristics of printed fabrics.