Gravure printing occupies nearly 30% of the market in cigarette pack printing due to its high saturation, high contrast, high brightness, strong consistency, and high printing plate durability. The gravure pack printing process is relatively mature. The reason why it is relatively mature is because, firstly, there are so many types of gravure inks and papers that platemaking manufacturers have no and cannot formulate a complete set of gray balance parameters and printing characteristic curves for each printing manufacturer; second, platemaking factories More proofs are used to evaluate the quality of plate-making, and the actual printing conditions are quite different from the process conditions of proofing. Because gravure packs are mostly solid, color blocks, and lines, the color management requirements in plate making are relatively strict, and the control of the gravure printing process is relatively easy compared to offset and flexo printing. Cigarette printing plant's in-depth understanding of the gravure plate-making process helps to improve the success rate of the cigarette plate on the machine. Specifically: 1. The gravure is expressed by the size and depth of the mesh hole. In order to improve the transfer rate of the ink, the field version commonly uses 37 ° flattened diamond dots, the angle of the engraving needle is 130 °, and the number of screen lines is 70 to 75 lines / cm; when engraving small text, the angle of the engraving needle is 110 °, and the number of screen lines is 80 lines / cm. 2. For solid, fine (inverted) text or products with the same color on a lighter screen, if you want to ensure the depth of the net hole when making a plate, the clarity of the text will be affected; and the angle of the scraper during printing will affect the solid and dot It is also different. The angle of the blade is large, and the text and dots are clear, but the solid ink layer is thin and the gloss is poor. On the contrary, the angle of the scraper is small, the text and dots are blurred, the solid ink layer is thick, and the gloss is high. In addition, In order to improve the transfer rate of ink, the slow-drying agent is used in a large proportion, and the fast-drying agent in field printing is used in a large proportion. Therefore, separate plate making should be considered. 3. After the printing plate is made, carefully check its concentricity, balance, incremental increments, etc., so as not to affect the printing overprint. The cigarette pack has the requirements of friction resistance and high temperature resistance of the printing ink (0.5 seconds at 150 ~ 160 ° C without fading). There are usually two solutions, one is to choose high temperature resistant ink (nitrocellulose resin meets this requirement, and the price is cheap, so it is the first choice of link material); second, choose high temperature resistant varnish, cigarette pack printing often use water-based Oil (relative to solvent-based varnish, the amount of water-based varnish is small, and the residual smell of ethanol solvent used is much lighter than ethyl acetate). At the same time, the gravure ink should have high fluidity, better scraping characteristics, good transferability and drying. The use of solvents in printing is to adjust the viscosity and dryness of the ink. Since the dissolving power and volatilization rate of various solvents are different (ethyl acetate volatilization rate> toluene> ethanol> isopropanol), mixed solvents are often used. In printing, as the solvent continues to volatilize, the balance of the mixed solvent is broken. At this time, printing problems are easy to occur, and new solvents must be added continuously. In addition, the requirements for the amount of residual solvent in cigarette packs are usually not higher than 30mg / m2. For the faults that occur in the gravure of cigarette packs, it is necessary to comprehensively consider the same ink, printing plate, printing machine, doctor blade, printing environment, solvent, paper and other factors, and analyze the specific problems.
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