Corrugated board ink printing technology

With the development of social economy and the improvement of people’s living standards, people are paying more and more attention to the perfection of commodity packaging. Corrugated carton packaging has an increasingly large proportion of the entire package and its specific function. The key technology of corrugated cartons lies in the printing of ink and ink. This article talks about how to use the equipment improvement to improve the quality of ink printing.

First, printing dew white printing and whitening is the most common and most difficult to eliminate quality problems in corrugated box production, its causes are as follows: 1 paper poor ink absorption performance: 2 printing plate dirty: 8 cardboard with paper dust, dust Wait. The traditional way to deal with these problems is to change the box manually or increase the frequency of artificial wipes. These methods will play a role in the objective. However, the improvement effect after the change of the box is small, and it is easy to cause the efficiency to drop; the version will also cause waste of water, electricity, and labor.
In the process of equipment installation, maintenance, and management, after a long period of observation and analysis, I believe that the key to solving the problem of printing and dewpointing is dust removal, and the main source of dust is the single-blade separation. Based on this situation, I installed electrostatic suction and dust collection devices two years after the cross cutting knife of the cardboard production line and the paper feeding section of the printing press. Use a hair dryer in front of the computer to cut the knife to blow out or blow out the paper scraps hidden in the pit pattern when separating the single knife, and then use an electrostatic suction dust suction device at the delivery rack after the computer crosses the knife. Confetti sucks away. Apply electrostatic dust to the dust on the paperboard at the feed aprons and feed wheel gaps of the printer's paper feeding section to keep the printing surface clean and dust-free. Ink evenly. After such improvements, the printing effect of the product has been greatly improved, and the phenomenon of printing and whitening caused by dust has been fundamentally overcome.

Second, the treatment of overprinting and taking place Now that commodity packaging is more and more focused on the artistic and three-dimensional design of the pattern, consumers are able to feel the perfection of the purchased goods from the packaging. To achieve this goal, packaging and printing must use multiple printing—multicolor overprinting.
In the overprinting process, there often occurs overlap between the latter color and the previous color or the positioning position is misplaced, so that the printing pattern cannot reflect the design effect of the product packaging, and even the people diverge from each other completely destroy the image of the product.
In response to this special problem, our factory has gone through a period of in-depth field investigation and study, from the speed of electronic control to the accuracy of mechanical fit tolerances, carried out detailed calculations, carried out many improvements on existing equipment, and developed related equipment. Maintenance measures.
1. Improve the accuracy of printing cylinder phase positioning The encoder drum is used to control the phase position of the printing cylinder. If the counter is too low, the encode position is inaccurate and the printer moves. The general counter reflects a speed of 3K, but it often produces an error of ±1mm when positioning. After discussions with Taiwan Electric Control Co., Ltd., a 5K counter was produced, which reduced the positioning error of the printing cylinder to ±0.4 mm.
2. Timely lubrication of the transmission machinery, detection in the paper feeding process, if the transmission machinery can not maintain a good and smooth operation, then each board will arrive at the change in position, resulting in printing and set the walk. Therefore, it is very important to properly maintain and test the equipment. We have developed a daily commissioning checklist before starting work, including lubrication and maintenance. At the same time, the limits for wear of feed rollers and feed rollers are set. If they fail to pass, they must be turned and re-wrapped or replaced to overcome the phenomenon of walking and oblique movement of the cardboard during walking.
3. The traditional printing machine adopting suction feeding adopts the upper printing, and only the inspection paper wheel can be used to transport the paperboard, while the new printing machine adopts the advanced technology of lower printing and upper suction air conveying cardboard. The suction paper feed uses the wind to suck the paperboard on the transfer wheel. The suction force is uniform, the position is not taken, and the position is not inclined. The curved paperboard is evenly leveled, the printing level is right, and the ink is evener and flatter.

Third, printing ink bad treatment Ink bad problem In addition to paper problems, offset problems, in the equipment there is a technical problem with the ink roller.
Anilox roller is used in the anilox roller, in the high standard carton printing, using 250lpi anilox roller, the mesh hole is most likely to be blocked by ink residue, resulting in uneven ink, ink is not enough, light ink and so on phenomenon. The traditional method is to use clean water to clean the ink roller. No matter how the water scrubs the ink roller or the scrubbing method, the effect is not ideal. A new ink roller is used for less than a month, and the effect is obviously not as good as before.
Through long-term exploration and experimentation, 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 the ink particles from entering the ink roller.
2. Regularly (usually two weeks) use an anilox roller cleaner to perform cycle cleaning.
3. Every day after work, use a dripping water circulation to clean the ink roller, and use a 60 to 100 times magnifying glass to dial the mesh of the ink roller. There should be no residue of the ink residue. If there is residual ink residue, immediately clean it with a deep cleaning agent.
Through the above points of maintenance, the inking ink roller effect can always be maintained.
The above-mentioned several printing technical problems are crucial to the quality of the carton products in actual production. Through the recognition and improvement of the equipment and good maintenance, the products that the customer is satisfied with can be produced and the comprehensive benefits of the enterprise can be improved.