Effective way to improve printing results
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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 has a growing share of the overall packaging industry with its unique features, while the most critical technology for corrugated boxes is ink printing. This article talks about how to use equipment improvement to improve the quality of ink printing.
First, the processing of printing white
Printing white is the most common and most difficult quality problem in the production of corrugated boxes. The reasons for this are: poor ink absorption on paper; dirty printing plates; paper dust and dust on cardboard. The traditional way to deal with these problems is to manually change the box or increase the frequency of manual rubbing. These methods will play a certain role in the objective, but the improvement effect after the box is changed is small, and it is easy to cause the efficiency to drop; the wiping plate will also cause waste of water, electricity and labor.
After long-term observation and analysis, the author believes that in the process of equipment installation, maintenance and management, the key to solving printing whiteness is dust removal. The main source of dust is generated when the single-knife paper is separated. Based on this situation, the author installed an electrostatic suction and dust suction device in the paper-feeding section of the paperboard production line and the paper feeding section of the printing machine two years ago. Before using the hair dryer, use a hair dryer to blow out or blow off the paper dust hidden in the pit pattern when the single knife is separated, and then use the electrostatic suction device to suck the paper dust at the delivery tray behind the computer cross cutter. go. In the gap between the paper feed rubber ring and the paper feed roller of the paper feeding section of the printing machine, the dust on the paperboard is sucked away by electrostatic vacuum to keep the printing surface clean and dust-free. Under such conditions, when the paperboard enters the printing roller, the ink is inked. Barrier-free, even ink absorption. After such improvement, the printing effect of the product has been greatly improved, and the phenomenon of printing whiteness caused by dust has been fundamentally overcome.
Second, the processing of overprinting
Nowadays, commodity packaging is paying more and more attention to the artistic and three-dimensional sense of the pattern, so that consumers can feel the perfection of the purchased goods from the outer packaging. In order to achieve this, packaging printing must use multi-color printing, that is, multi-color overprinting.
In the overprinting process, there is often a misalignment between the latter color and the previous color or the positioning position, so that the printed pattern can not reflect the design effect of the product packaging, and even different, completely destroying the image of the product.
In response to this special problem, after a period of in-depth investigation and research, the author's company carried out detailed calculations on the electronic control response speed to the mechanical tolerance tolerance, and carried out several improvements on the existing equipment, and at the same time formulated relevant Equipment maintenance measures.
1. Improve the accuracy of the phase positioning of the printing cylinder
The phase of the printing cylinder is controlled by the encoder and the counter. If the accuracy of the counter is too low, the encoder position will be inaccurate and the position will be changed during printing.棸鉩 ounter reflects the speed of 3K, but it often produces ±1mm error when positioning. After discussing with Taiwan Electronic Control Company, it produces a 5K counter, which reduces the positioning error of the printing cylinder to ± 0.4mm.
2. Timing lubrication, inspection transmission machinery
In the process of feeding, if the transmission machinery can not maintain a good and smooth operation, the position of each cardboard arrival will change, resulting in printing and positioning, so it is very important to carry out proper maintenance and inspection of the equipment. . A daily test runlist for start-up work, including lubrication and maintenance, can be developed. At the same time, the limit of the amount of wear of the paper feed roller and the paper feed ring is determined. If it fails, it must be lapped, re-encapsulated or replaced to overcome the phenomenon of the paperboard walking and oblique position during the walking process.
3. Using suction to feed paper
The traditional printing press adopts the upper printing, and only the paper feeding wheel can be used for conveying the paperboard, and the new printing machine adopts the advanced technology of the lower printing and the upper suction conveying cardboard. The air suction paper uses the wind to adsorb the paperboard on the conveying wheel, and the suction force is uniform, does not move, does not slant, and the curved cardboard is sucked flat, the printing is correct, and the ink is more even and flat.
Third, the processing of poor printing on the ink
In addition to paper and offset problems, there is also a technical problem with the inking roller on the equipment.
The inking roller adopts an anilox roller. In the high standard carton printing, an anilox roller of 250 lpi or more is used, and the mesh is most likely to be blocked by the ink residue, thereby causing uneven ink, insufficient ink, and shallow ink. phenomenon. The traditional method is to clean the inking roller with water. No matter the method of water scrubbing the inking roller or cleaning agent, the effect is not ideal. A new inking roller is used less than one month, and the effect is obviously not as good as before.
Through long-term exploration and experiment, the author's company believes that the following methods can effectively solve the problem of poor printing ink.
1. A filter is placed in the ink tank to prevent the ink particles from being transferred to the inking roller.
2. Regularly (usually half a month) use an anilox deep cleaning agent for circulation cleaning.
3. Wash the inking roller with dripping water every day after work, and dialysis the inking roller mesh with a magnifying glass of 60 times to 100 times. No residual ink residue, such as residual ink residue, should be cleaned immediately with a deep cleaning agent.
Through the maintenance of the above points, the inking effect of the inking roller can always be good.
The above-mentioned several printing technical problems are crucial to the quality of the carton products in actual production. Through the understanding and improvement of the equipment and good maintenance, the products that satisfy the customers can be produced and the comprehensive benefits of the enterprises can be improved.