With the development of today’s society, people’s life is constantly improving and the pace of life is also getting faster and faster. For example, the dyeing fastness of textiles (color fastness for short) refers to the fading degree of digital printing fabric under the action of external factors (extrusion, friction, washing, rain, insolation, saliva immersion, etc.) during use or processing, and is an important indicator of digital printed fabrics. The color fastness is good, and the textile is not easy to fade in the later processing or use process; If the color fastness is poor, there will be color fading, slight color fading, or staining, causing a lot of *** frequency.

The fading of the digital printed fabric with poor color fastness will affect other clothing worn on the body, or contaminate other clothing when washing with other clothing, affecting the appearance and wearing performance. On the other hand, good or bad color fastness is directly related to human health and safety. Dye molecules and heavy metal ions on digital printed fabrics with poor color fastness may be absorbed by the human body through the skin, thus harming the skin and even the health of the body.

The factors that affect the color fastness of digital printed fabrics include internal factors and external factors. Internal factors refer to the firmness of the combination of dye and fiber, while external factors refer to the external force or environmental conditions imposed on the digital printed fabric by external factors during use. Because external factors cannot be controlled, producers should strive to improve the color fastness of digital printed fabrics.

First, dyes are selected according to the characteristics of the fibers.

Different kinds of dyes have different binding forms with fibers, and the binding bond strength is also different.

Second, dyes are selected according to the color depth.

Try to choose dyes whose color light is close to the desired color, look at the color fastness index of the selected dye itself, and finally, see whether the saturation of dye can reach the depth of the desired color.

Third, the dye uptake rate of the dye to the fiber.

When selecting dyes, the dye loading rate should be taken into account, otherwise there will be a race between dyes, i.e. one dye will occupy the dyeing position of the fiber in advance, resulting in other dyes only being dyed on the surface of the fiber and not forming uniform binding bonds with the fiber, thus being destroyed first in the subsequent process or daily use.

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