Research on inkjet plate making technology
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The rise and popularity of computer typesetting and laser phototypes set off and completed the first revolutionary change in printing digitization. The introduction and application of inkjet technology set off a second revolutionary change in printing digitization, one of which is important. The direction is to use inkjet printers, inkjet film software system and high-performance digital inkjet plate-making film to realize digital plate making with inkjet technology, thus replacing the filmmaking and traditional photo plate making of imagesetters and output machines. The process has improved the efficiency of offset printing, screen printing and other processes, and increased the economic benefits of the printing and plate making industry.
1. The meaning of inkjet plate making
Inkjet plate making is based on the principle of inkjet printing. RIP, color separation and imposition of documents are output to a dedicated inkjet film through an inkjet printer. No complicated processes such as development, fixing and rinsing are required, and then the printing process is directly carried out. Plate making. The ink dots obtained by inkjet are black and precise, the dot shape and angle are adjustable, and the generated dots and lines are clear, which can simulate the real dot and color effect of printing, and the cost is low.
2. The difference between inkjet film and laser printing, laser photo ejection
At present, there are many users who use laser to print out the film, and with a black and white laser printer, it can realize the filming at home anytime and anywhere. However, the alignment accuracy of the laser printed film is relatively poor. For the four color chips, the size of each film will be flexibly changed to different extents, so that the final four color chips cannot be accurately combined. And the laser printer is not suitable for the output of large color blocks and image hanging nets. It usually shows that the color blocks are not black, the flat net is not flat, the dot shape is single, the hanging net mosaic is serious, the number of hanging net lines is not high, the resolution is low, and the small characters cannot be reproduced. Such defects, which affect the quality of the final print. The quality of the laser imagesetter is undoubtedly the best, but its price is expensive, most users can not buy it themselves, but can only go to a special place to go out. The price of the film is very high, and the time and urgency of the film cannot be controlled by itself, which is very inconvenient.
Inkjet printing has successfully solved the defects of laser printing, and the final four-color film alignment accuracy is much higher than laser printing (according to the actual use of the latest E pson St tylus P hoto R 2 1 0) Test, two A 4 size color separation register registration marks can be completely aligned), and the ink dots are black and accurate, the dot shape and angle can be adjusted, and the generated dots and lines are clear, and the effect can be completely matched with the laser photo film Comparable, the number of hanging network lines can reach more than 70 lines. Compared with the laser photo-distribution process, it is simple and practical, low in cost, low in investment, and only requires the addition of special software and printers. Small and medium-sized printing plants can make extremely small investments, establish their own production centers, and end up often going to the production center to be exhausted. Thereby saving a lot of manpower, material resources and financial resources. Moreover, due to the continuous increase in the price of precious metals such as silver in the international market, the cost of laser photo-output of film is increasing, and the profit is getting lower and lower. This is one of the main reasons why many output centers switch to inkjet film production. In addition, inkjet film does not require post-rinsing, is very environmentally friendly, avoids environmental pollution caused by development and fixing syrup, and solves the problem of traditional film contamination of the environment. And can prevent business leaks.
3. Structure and composition of inkjet plate making system
① Mainly configured P C machine (P e n t i u m I I or more C P U , 2 5 6 M or more memory).
② Special inkjet plate making software for color separation, hanging net and inkjet film.
③ High-precision large format inkjet printers.
The most widely used is the E P S O N fifth-generation 7 9 and 9 9 series printers. Compared with previous generations of products, E P S O N made two major changes. The first is to increase the nozzle from the original 180/group to 365/group, which greatly improves the printing speed. Secondly, the traditional mode of pure paper roller feeding is changed. The stepping motor is added to the transmission structure of the paper feeding, and the stable page tension is always maintained when the paper is fed, which greatly improves the registration accuracy of the printer. At the same time, E P S O N's fifth-generation products surpassed the fourth-generation products in terms of stability in use and ink head life.
④ Professional inkjet film output film.
Inkjet film is mainly made of high transparent waterproof and non-waterproof. The key to inkjet printing is that the film used must be highly ink absorbing and the ink dots are not opened. In the printing process, in order to achieve fine and higher blackness, a large number of ink dots are concentrated on the film, and so much ink must be absorbed by the film in a short time, and there is no diffusion phenomenon, which is proposed for the film. Very high demand. In addition, there are many other professional technical requirements, such as printing the plate making pattern should be able to maintain the longest time, the pattern can be scratch resistant, etc., so the quality and performance requirements of the inkjet plate-making film exceeds the ordinary inkjet. Popular inkjet printing media products such as photographic paper and inkjet printing paper.
⑤ Stable quality, various properties (including surface tension, etc.) Excellent inkjet film output special ink.
We know that inks fall into three categories, dye inks, pigment inks, and solvent-based inks. For inkjet film output systems, pure water-based dye inks should be chosen. Because, the first pure water-based dye ink prints smoothly, does not block the head, and has no corrosion to the ink head of the printer, which can ensure the life of the ink head. Secondly, the pure water-based dye ink can completely penetrate into the ink-receiving layer of the film, so that the printing surface can be closely adhered to the PS plate during the printing process, thereby preventing the occurrence of "light seepage" during the printing process, and adding dots. Scratch resistance. And as long as the water-based dye ink and the printed inkjet film can achieve the perfect combination, not only will not smear the ink, but also can be waterproof, you can still get the bottom of the faucet, just blow it and blow it with a hair dryer oven. Drying, there will be no ink smearing on the edge of the dot. However, since the pigment ink cannot penetrate into the cavity of the ink absorption layer, the pigment ink can only stay on the surface of the ink absorption layer, which causes the film and the P S version to be unevenly printed during the printing process, and the phenomenon of "light seepage" occurs. In addition, since the pigment particles stay on the surface, their scratch resistance is also poor. Solvent-based inks are also not available for inkjet film output systems. It is well known that solvent-based inks are corrosive, so printers using solvent-based inks use specially designed ink heads and ink tubes. Not all printers can use solvent-based inks. Otherwise, ink heads and ink tubes The nozzle is easily damaged by corrosion.
4. Application
At present, the inkjet plate-making technology is fully applicable to the book publishing industry, plate-making output center, packaging and other plate-making industries under the premise of uniform network connection, and is also widely used in the printing industry, advertising industry, Textile printing and dyeing industry, pre-press digital proofing, screen plate printing, offset plate printing, business short-run printing, various renderings, engineering drawings, PCB circuit board test proofing, aerospace mapping, handicraft production and other fields.