What are the similarities and differences between printing and dyeing

The same point of printing and dyeing

In the process of printing and dyeing, the mechanism of dyeing fibers on dyes is the same, including three stages of adsorption, diffusion, and fixed in the adsorption, diffusion, and fixing of each other. Only a color of a color in the print is applied to the part of the textile according to the pattern pattern, and the dye dye fiber is completed after a certain post -treatment, and a printing product with one or more colors is obtained on the textiles. Therefore, printing can also be said to be "local dyeing."

When choosing dyes of the same type of dyeing and printing, the physical and chemical attributes of the chemical aids used are similar or the same, so their dye dyeing and the principle of fixation are similar or the same. For fibrous products of the same variety, if the same dye dyeing and printing can have the same dyeing fastness, such as reducing the dye dyeing, which is good, or its fastness on print products.

The difference between printing and dyeing

The difference between printing and dyeing is the following aspects.

1. In the printing and dyeing operation, dye aquatic solution is used for dyeing. Generally, it does not add thickening paste or adds only a small amount of paste. Add a lot of sticky slurry that is tuned into a certain degree of viscosity to prevent the flower -shaped outline, the distortion of the flower, and the swimming of dyes when the pattern seeps out due to the seepage of the pattern.

2. The concentration of dyes during dyeing is generally not high, and the problem of dye dissolution is not too large. Generally, solvents are not added. The concentration of dyes and chemicals in the color paste during stamp paste is much higher than the concentration in general dye baths. In addition, it contains a large amount of paste, which makes it difficult to dissolve dyes. Therefore Dissolt salt B and so on.

3. During dyeing (especially immersion), the fabric has a longer action time in the dye bath, so that the dye can be fully diffused and penetrated into the fiber to complete the dye process. The dye in the stamp is not easy to diffuse and penetrate, so the steam or roasting of the dye should be improved after printing to improve the diffusion rate of dyes and help dye dye fibers.

4. If you need to color when dyeing, it is generally required to use the same type of dye for coloring. It rarely uses two different types of dyes (the exception of dyeing textiles). The printing can be used to use several different types of dyes on the same textiles for common printing, such as: coating with insoluble nitrogen dyes with the same printing, active dyes and insoluble nitrogen dyes with the same printing Puppet nitrogen dyes are printed with cluster dyes, etc., and sometimes can be used to print different types of dyes in the same color slurry, such as: coatings are the same as the insoluble nitrogen dye, decentralized dyes, and active dyes. Coupled with a variety of processes such as extraction printing, anti -dye printing, and anti -print printing, the printing process design is different from dyeing. Printing workers must deeply understand the characteristics of various dyes and additives, and use the contradictions and compatibility of dyes and additives as product services to print some special -style printing products.

5. Printing and dyeing dyes are roughly the same, but there are also some dyes specifically used for printing, such as printed active dyes (domestic P type active dyes, etc.), stable and insoluble pupil dyes, soluble reduction dyes.

6. Print fabrics have white ground prints, or white and white printed products. Therefore, it is required to process the whiteness requirements similar to bleaching cloth and semi -products before the printing fabric. Products have low requirements, especially before treatment when dyeing dark color.

7. During the staining, the weft inclined control of the fabric is not high. When printing, there must be no strain, especially the pattern such as grid -shaped, horizontal strips, squares, or characters. The requirements for the semi -product latitude are very strict. During the tollment, the pattern on the fabric deformation is generated.

8. Dyeing half products require a good capacity to facilitate the spread and infiltration of the dye to the fiber during dyeing. During printed processing, printing and drying are continuous. The dye has a short role in dye. It also requires the printing of the printing area to be uniform, clear outline, smooth lines, and no disconnection. Therefore, for semi -printed products, not only the hair effect is uniform and has a good "instantaneous hair effect", and each step is important for each step of processing and processing. Only by obtaining a good semi -products The pre -processing requirements of the product are higher than the dyeing half of the product.

9. The cover of the printing point of the printed blossoms is better than dyeing, especially some disorderly flower types have a good cover -up effect on some billet woven defects.

10. For non -ferrous textiles, dyeing products require uniform and full color and bright cores, while printing products are required to be clear and generous, with clear outlines, white flowers, full color, and artistic.