The effect of the quality of the bleaching and semi-finished products on the printing is as follows:
(1) Remaining slurries on semi-finished products will produce reducing substances when steamed at high temperature, causing some poorly colored dyes that are sensitive to reduction. The presence of residual slurry will also cause the capillary effect of the semi-finished product of the bleaching and bleaching to be different, which will cause poor penetration and poor level dyeing. Therefore, the desizing should be net.
(2) Better permeability is required for tight fabrics, otherwise it will affect the freshness of printed color, the outline of the pattern, and the smoothness of the lines.
(3) The degree of mercerization will directly affect the amount of color and brightness of the surface of the dye. After mercerizing, the width of the cloth should be controlled and the pH of the fabric should be maintained at neutral and non-reducible.
(4) Before printing, semi-finished products can not have dry, wet uneven and curling phenomenon.
(5) The surface of the semi-finished products before printing must be clean and smooth, and the surface short velvet should be removed. Otherwise, the surface of the screen can easily adhere to the surface of the screen during the printing process, resulting in the screen mesh being blocked or the incarnation of the screen. .
(6) Rectangular or horizontal stripe arrangement Geometric patterns and grid patterns require particularly high flatness of semi-finished products. They cannot have slack or arc bends. Otherwise, the printed pattern will be deformed. Therefore, the semi-finished products of this type should be fixed in full-width tenter before printing to ensure that the fabric of the semi-finished product is flat.
(7) In addition to desizing and purifying the viscose fiber fabrics, conditions should be causticized so that the fibers can be fully expanded and shrunk to achieve dimensional stability, which is conducive to the even penetration and diffusion of the dyes inside the fibers, and improved color. Thickness. In the current conventional production, in order to increase the amount of coloration of the reactive dyes and the degree of richness of the color, a urea-sodium carbonate solution is impregnated before printing to facilitate the dissolution and dyeing of reactive dyes at the time of fixation.
(8) Synthetic fabrics must be thoroughly cleaned of the oils and slurries on the fabric prior to printing. Failure to do so may affect the dyeing of the dye and even affect the feel of the finished product after printing.
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