The flexible printing of corrugated paper with high wire is a comprehensive system coordination process, which requires the adjustment and coordination of all relevant links to achieve a relatively optimal value. Such as plate-making, ink, corrugated paper and cardboard, printing equipment, printing technology and other links are very important and must be well coordinated. How to realize the flexible printing of high net line corrugated paper? The key technologies are:
(1) In terms of flexible plate making, determine the best solution that is suitable for both printing and product design
1. Determine printability conditions
First, we must understand the printing equipment. For example, the unit color number, the type and line number of the anilox roller, the basic conditions of the paper feeding system, the scraper system. There are also paper types, such as white paper or coated paper. If possible, we can provide a set of test printing plates to test the printing suitability of each printing machine. It includes a ladder bar for testing the expansion of different network lines and dots of the flexographic version, a color block used to measure the solid density value of the ink, a simple chromatogram with different dot ratios overprinted, yin and yang characters and straight lines of different font sizes, a module for measuring color error To observe the pressure bar of the printing equilibrium pressure and so on. The test printing plate needs to be completed under the production conditions of normal printing board, standard production of water-based ink, normal printing pressure and vehicle speed. Of course, you can change some printing conditions to get different test samples. Through the analysis of the test sample, we can get the printability of this type of printing machine under normal conditions. It can get the dot expansion of each color, curve, solid density of water-based ink, hue value, dot collision situation, influence of color sequence, reduction of fine lines, overprint error and printing balance pressure.
Combining the test data obtained above and the printing effect of the test sample, a color matching management system for this printer can be established, such as establishing a dot compensation curve for dot expansion, screen color and gannina curve correction, and color simulation of proof And matching, etc.
2. Determine the plate-making process and color separation plan
In flexo plate-making, the determination of the color separation process plan is a key factor, and it plays a certain role in determining whether the high-net-line products can print successfully. The color separation of flexible printing should use the least amount of color as possible, and the purest color as possible to complete the color superposition, which is very helpful for printing and reducing costs.
3. Selection of the number and angle of screen printing screen
The number of screen lines on the printing plate is restricted by the number of screen lines of the anilox roller, and the ratio between the two is required to be above 1: 5. The anilox roller of 400L / in can achieve the printing plate of 80L / in at most, the line number is too high and it is easy to paste and produce moire. Therefore, the higher the number of screens, the better. Moreover, the printing effect of 80L / in and 75L / in will not be much different in terms of fineness.
The screen angle of flexo printing mainly adopts 7, 37, 67, 82, and 7, 22, 52, 82 angles according to the angle of the anilox roller. However, the angle of the screen should be based on the actual product and cannot be one size fits all. If the linear pattern of the monochromatic screen is linear, the angle of the screen must be 45 degrees or 0 degrees, otherwise the edges of the screen will appear more jagged. The selection of the superimposed pattern angle should be based on the principle that the hue angle of the main color of the product pattern differs by 30 degrees. If the portrait skin is dominated by yellow tones, then the color difference between magenta and yellow must be above 30 degrees; if the landscape is dominated by green tones, then the color difference between cyan and yellow must be above 30 degrees, otherwise it will easily cause moire . Carry out a proofing simulation of screening before making a plate to determine the best screening method. Discrete outlets use a certain screening technology to increase the anti-counterfeiting of products.
4. At present, the direct plate-making system mainly adopts extremely high transfer technology, and the image is directly formed on the resin plate after color separation and imposition. The digital printing plate has the advantages of complete dot pattern, extremely high light dots are not easy to lose, low printing dot expansion rate, long tone, large dots, and no blur, etc. It is the best choice for flexographic printing with high screen.
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