Discussion on the Water-ink Printing Technology of Corrugated Board
With the development of social economy and the improvement of national living standards, people pay more and more attention to the perfection of commodity packaging. Corrugated carton packaging accounts for an increasing proportion of the entire article packaging industry due to its unique functions, and the most critical technology of corrugated carton is water-ink printing. This article talks about my experience on how to use equipment improvement to improve the quality of ink printing. 1 Treatment of printing white spots Printed white spots are the most common and most difficult quality problems in the production of corrugated cardboard boxes. The causes are: ①poor ink absorption of paper; ② dirty offset; ③ paper dust and dust on the cardboard. The traditional treatment method for these problems is to manually change the box, and the second is to increase the frequency of manual wiping. These methods will play a role objectively. However, the effect is not much improved after changing the box, and the efficiency is reduced, and the rubbing also causes waste of water, electricity and labor. In the process of equipment installation, maintenance, and management, after long-term observation and analysis, I believe that the key to printing white spots is to remove dust, and the main source of dust is generated when the paper is separated by a single knife. Based on this situation, I installed an electrostatic dust suction device at the back end of the computer cross cutter of the cardboard production line and the paper feed section of the printing machine two years ago. Use a blower in front of the computer cross-cutting knife to blow out or blow away the paper shreds hidden in the pits when the single-piece knife is split, and then use an electrostatic dust suction device to shred the paper at the paper receiving rack behind the computer cross-cutting knife Suck away. At the gap between the paper feed rubber ring and paper feed roller of the paper feed section of the printing press, the dust on the cardboard is sucked away by electrostatic dust to keep the printing surface clean and dust-free, so that when the product enters the printing roller, the ink is unobstructed and the ink is absorbed. Evenly. After such improvement, the printing effect of the product has been significantly improved, and the phenomenon of printing white spots caused by dust is fundamentally prevented. 2 Handling of overprinting Nowadays, product packaging pays more and more attention to the artistic and three-dimensional sense of patterns, so that consumers can feel the perfection of the purchased products from the outer packaging. To achieve this goal, packaging printing must use multi-color printing-that is, multi-color overprinting. In the process of overprinting, there is often a misalignment between the latter color and the previous color or the positioning position, so that the printed pattern cannot reflect the design effect of the product packaging, or even a big difference, which damages the image of the product. In response to this special problem, after a period of in-depth on-site investigation and research, from the electronic control reaction speed to the mechanical tolerance tolerance accuracy, I made a detailed calculation, made many improvements to the existing equipment, and formulated relevant equipment maintenance Measures. 1) Improve the accuracy of the phase positioning of the plate cylinder The plate cylinder phase positioning adopts the encoder (encoder) and counter (counter) to cooperate to control. If the counter precision is too low, it will cause the encoder position to be inaccurate, and will move when printing. Generally, the counter response speed is 3K, but an error of ± 1mm ​​is often generated during positioning. After consultation with the Taiwan Electric Control Company, a 5K counter is produced, which reduces the positioning error to 0.4mm. 2) Timing lubrication and detection of transmission machinery In the paper feeding process, if the transmission machinery cannot maintain a good and smooth operation, the position of the cardboard will change every time it arrives, resulting in overprinting. Therefore, it is very important to carry out correct maintenance and testing of the equipment. We have developed a daily operation checklist before starting the work, including lubrication maintenance. At the same time, the wear limit of the paper feed wheel and paper feed ring is formulated. When it is unqualified, it must be refurbished, re-coated or replaced, thereby overcoming the phenomenon of cardboard displacement and skew during walking. 3) Use suction to feed paper The traditional printing machine adopts the upper printing, and only the paper-checking wheel can be used to transport the cardboard, while the new printing machine adopts the advanced technology of lower printing and upper suction to transport the cardboard. The suction paper feed uses the wind force to attract the paperboard to the conveying wheel. Its suction force is uniform, not in the position or in the oblique position, and the curved paperboard is sucked flat, aligned during printing, and the ink is more uniform. 3 Bad printing ink treatment In addition to paper quality problems and offset problems, there are also technical problems with the ink rollers on the equipment. Anilox rollers are used for inking rollers. In high-standard carton printing, anilox rollers with more than 250 lines are used. The mesh holes are easily clogged with ink residue, resulting in uneven ink application, insufficient ink volume, and light ink. The traditional method is to use clean water cleaning, non-aqueous water scrubbing or cleaning agent scrubbing, but the effect is not ideal. The life of a new ink roller is less than a month, and the effect is obviously not as good as before. Through long-term trial and error, we feel that the following methods can effectively solve the problem of poor printing ink. 1) Add a filter in the ink tank to prevent ink particles from entering the ink roller? Through the maintenance of the above points, the inking effect of the inking roller will always remain good. The above-mentioned printing technical problems are very important to the quality of carton products in actual production. 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2) Regular (usually half a month) use anilox roller deep cleaning agent for cleaning?
3) Clean the ink roller with clean water circulation every day after work, and check the mesh of the ink roller with a magnifying glass of 60 times to 100 times. There should be no residue of ink residue, such as local residual ink residue, immediately scrub clean with deep cleaning agent.
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