As we all know, in order to improve the beauty of socks, make them less monotonous and attract customers to buy them. Manufacturers will design some patterns on the socks, which requires printing technology to operate. Printing technology can be divided into traditional printing and digital printing. Due to the continuous improvement of the market demand for printed fabric technology, traditional printing is gradually replaced by the rapid development of digital printing. Today, WIN@TEX will explain the process of digital printing in detail.
What is digital printing?
Digital direct jet printing refers to inputting various digital graphics produced and processed by the computer into the computer, and then processing them through the computer color separation printing system. The special RIP software directly sprays various special dyes (active, disperse, acid and paint) onto various fabrics or other media through the jet printing system, and then obtains various high-precision printing products on various textile fabrics after processing. It is characterized by flexibility, easy modification, fast speed and more accurate and realistic details. It can make up for the shortcomings of traditional printing, such as fine patterns with high processing requirements or patterns with high color change requirements.
What are the advantages and disadvantages of digital printing
Advantages of digital printing
- Digital printing is inkjet on demand to reduce the waste of chemicals and wastewater discharge; Low ink-jet noise, low energy consumption, quiet and clean, no environmental pollution, and realize green production process.
- It breaks the defects of the traditional printing process, simplifies the cumbersome process, shortens the traditional printing process, improves the order cycle, and reduces the cost of printing plate production and proofreading.
- The color gamut is wide, the colors are bright and rich, and there are more than 10 million kinds, while the traditional printing is only 10 kinds.
- High precision, clear and delicate image. At present, the resolution of digital printing is as high as 1440dpi, while that of traditional printing process is only 255dpi.
- Realize small batch production, not limited by production batch, and realize personalized production demand.
Disadvantages of digital printing
1.The printing speed is slow.
Efficiency is money. The speed of printing is largely the benefit of the enterprise. At present, the printing speed of the fastest digital ink-jet printing machine can reach 150m2 / h, but compared with the traditional printing machine, it is still far behind and needs to be further improved.
2.The ink cost is high.
Although digital ink-jet printing does not need to make screen printing, the total cost of small-scale production is lower than that of traditional printing, and the price of the ink used is much higher than that of the dyes and pigments used in traditional printing. Therefore, after a certain printing length is exceeded, the ink price will pull the cost of digital ink-jet printing to exceed that of traditional printing. In order to promote the development of digital ink-jet printing, the price of ink in the future needs to be adjusted reasonably.
Compared with the spot color printing of traditional printing, that is, each set of colors is separately mixed with color paste. Through the computer color measurement and color matching system, high color accuracy can be achieved. Even if a certain color paste has deviation, it will only affect a set of colors. Digital printing is CMYK mixed color printing. All colors are mixed by four-color inks. A little extra influence, such as the difference of ink, the difference between print heads, and the small change of environment during printing, will affect the accuracy of a series of colors after color mixing. Therefore, the color accuracy of digital printing is slightly worse than that of traditional printing.
What determines the quality of digital printing?
As for the accuracy of digital printing, people always ask what the printing resolution is. Originally, this is only a part of the printing accuracy, which involves the resolution of the nozzle, the mechanical accuracy, and the matching degree of the ink and the nozzle.
At present, there are piezoelectric nozzles, thermal foam nozzles, photo nozzles and industrial nozzles in the market. The most commonly used nozzles for printing are piezoelectric photo heads and industrial nozzles. The piezoelectric photo head mainly consists of Epson fourth generation head, fifth generation head and sixth generation head. The fifth generation head is the mainstream product, with the highest resolution of 1440dpi, and supports 720dpi and 540dpi printing forms. It is also the most used head in the printing machine.
The impact on printing was much greater than the resolution of the nozzle because the mechanical processing was not very high in China. The assembly accuracy is not good, and the same is the primary reason that affects the accuracy of printing machinery. For example, poor parallelism will lead to fabric deviation, poor bearing quality and inconsistent wear, which will also affect the question of parallelism.
It is generally thought that ink may affect color saturation, color fastness and coloring amount, but in fact, ink also has a great impact on printing accuracy. What is remarkable is that if the ink is not smooth and there are many mechanical impurities, there may be broken lines and plugs, small white lines in the printing process, and then the printing accuracy will be affected.