Which dye printing processes are used for rayon, linen […]
Which dye printing processes are used for rayon, linen cotton, and cotton? In theory, the printing processes that can be used for cotton, rayon, linen cotton, and all cotton, and their spandex-containing woven fabrics can also be used for knitted fabric printing. However, the printing of cotton, rayon and its knitted fabrics containing spandex currently mostly use reactive dye direct printing, vat dye discharge, reactive dye ground color and other processes, while reactive dye printing, paint discharge reactive dye ground color, reactive dye Printing processes such as discharge reactive dyes and ground colors are less used.
This may be related to factors such as the characteristics of the printing process, the equipment used for printing, and the shorter time for dye printing on knitted fabrics. For example, single-sided anti-print printing is relatively mature, but the characteristic of the printing process is that the anti-print paste is printed first and then the ground color is printed on the ground. However, the printing of knitted fabrics mostly uses a flat screen printing machine. Improper is more likely to produce "press-to-print" defects. In addition, paint discharge reactive dye ground color, reactive dye discharge reactive dye ground color printing process is less used, and may also be related to the mature color printing process of vat dye discharge reactive dye ground color. The above-mentioned printing process needs to be further explored, summarized and improved in the future to be better used in production.
The reactive dyes have complete chromatograms, bright colors, soft feel, convenient to configure printing pastes, and have good color fastness. They are suitable for all kinds of printing areas including brightly colored cotton, rayon and spandex-containing products with larger printing areas. The printing of elastic knitted fabrics has great application space and prospects.
The major drawback of reactive dyes is that their fixation rate is usually low. In addition, the structure of knitted fabric is loose, and there is more pulp per unit area in the printing process, and it is difficult to complete dyeing and fixing. If the semi-products of knitted fabrics to be printed are not mercerized, it is even more unfavorable for dye adsorption and fixation. Thereby increasing the pressure of washing and soaping printed fabrics. Knitted fabrics are washed and soaped by continuous or intermittent flat washing machine.
The fabric of the printing machine must be dried. If it feels damp, it can be baked after re-drying.
The baking temperature and time must strictly follow the process regulations.
Take one piece of cloth from each box to test the color fastness (soaping, rubbing, brushing).
After the stenter is pre-shrunk, the dye fastness test is performed again before entering the finished product.
For a small amount of paint with color change after baking, the direction of the color matching materials should be determined according to the pattern size and color depth, the baking temperature should be adjusted, and the laboratory should provide it to the printing workshop. The forehand must be proofed and baked to ensure that the color and color fastness reach the standard.