Several problems existing in the application of reactive dye digital direct printing
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Compared with traditional flat screen and rotary screen printing, the development time of digital printing is relatively short. There are still some shortcomings in both equipment production and process technology application. In the process of practical application, many product quality problems arise.
1. The color adjustment method is unscientific: traditional printing uses color blocks to adjust colors one by one, while digital printing uses the four-color separation principle to mix colors, so color adjustment can only be done on a computer. At present, most digital colorists use Photoshop software for color correction. The color correction of Photoshop software is mainly for inks and papers in the printing industry, and its parameters are not scientific enough for fabric products. In addition, colorists rely entirely on personal experience to color, which is completely incompatible with the advanced equipment of digital printing.
2. Poor color reproducibility: There are two main reasons for poor color reproducibility: On the one hand, it is determined by the four-color principle. The four-color mixing principle is completed through the reflection of cyan, magenta, and yellow. Secondary or tertiary colors are formed by spatial mixing. Therefore, as long as any one of the three colors of cyan, magenta, and yellow changes, the mixed color will change greatly.
On the other hand, it is affected by reactive dyes. Most of the reactive dye inks used in digital printing are high-temperature K-type dyes. These dyes are very sensitive to humidity. The humidity in the air and inside the steamer box Humidity and fabric moisture content, if one of these factors is inconsistent, it will significantly affect the color finish of digital printing.
3. The color brightness is not high enough: If the color of digital printing is mainly three colors of cyan, coffee, dark green, etc., that is to say, one color requires three of cyan, magenta, yellow, and black. Or four inks mixed together. Then, the vividness of the color will become worse. This is because when the three colors of cyan, magenta, and yellow are mixed, a certain grayscale will be produced.
Most of the printing colors are tertiary colors, which require three or four inks of cyan, magenta, yellow, and black to be mixed together, which will produce a certain grayscale. The printed product will be brighter not good enough.
In addition to poor color brightness caused by color mixing, digital printing with reactive dyes will also cause poor color brightness. The reasons are as follows: water absorption and bleeding of the slurry; water absorption and bleeding of the fabric and dye chemical; the color finish of the three primary color dyes is not standard; the problem of black ink with reactive dyes.
4. The size of the ink droplets cannot be adjusted according to the pattern: Many of the digital printing machines currently on the market can adjust the size of the ink droplets. But this adjustment is entirely an overall ink droplet adjustment, that is, when adjusting the ink droplets for 5PL printing, all nozzles can be supplied at 5PL; when adjusting the ink droplets for 50PL printing, the ink droplet sizes of all nozzles are all 50PL.
Digital printing cannot automatically change the amount of inkjet according to different parts of the block surface and lines according to different patterns. In this way, the differences in different parts of the pattern cannot be satisfied, which will greatly reduce the beauty of the pattern.
5. The sizing system is not perfect: mainly the sizing equipment and additives must fully meet the needs of digital printing. However, there is no good special equipment in terms of sizing uniformity, weft and tilt control, speed, on-demand sizing, etc.; the additives also lack personalization.
It is hoped that in the future, in the process of digital printing progress, continuous improvements will be made, such as the development of nozzles and control software that can automatically adjust the size of ink droplets according to the requirements of different parts of the pattern; the development of better quality sizing equipment and Additives to improve the sizing system; develop scientific color mixing methods to reduce dependence on the experience of color mixing personnel; develop a complete set of process technologies and special additives to improve the color reproducibility and brightness of digital printing . (Guo Wendeng, chief engineer of Hangzhou Wanshili Group Co., Ltd.)
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