At present, China's corrugated carton printing technology is in a period of rapid development. The high-end carton printing technology has been greatly developed in recent years. 60LPI ~ 85LPI products have gradually increased, sometimes reaching 100LPI ~ 133LPI. But it is undeniable that with the development of high-end carton printing technology, a series of problems have gradually increased, mainly reflected in low production efficiency and high scrap rate. Now let's make some discussion on the problems encountered by manufacturers.
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In general, production efficiency is mainly restricted by issues such as pre-preparation, printing speed, and time to change plates. The preliminary preparation includes the adjustment of the printing plate, the allocation of ink, the adjustment of various pressures, and the adjustment of color registration. Because it is a high-end carton printing, all links are relatively demanding, relatively time-consuming and laborious. Furthermore, the speed is determined by the machine itself. Generally, because of the high requirements for the color accuracy and color superposition of high-end carton printing, the speed of the machine is not as fast as that of printing ordinary carton. In addition, the cardboard of high-end carton is mostly thin, and the requirements for the paper feeder are relatively strict, so the speed will be limited.
At present, as the market products tend to be produced in many varieties and small batches, the impact of the changeover time on production efficiency is increasing. Ordinary printing machines use a track structure. Each color machine needs to be separated when changing or wiping the plates, and then merged together after changing the plates, which wastes a lot of time invisible. In order to overcome this problem, most of the high-end printing machines at home and abroad now use a unit-independent structure. When the unit is fixed, all the work can be completed by opening the door between the units when changing and wiping the version, which saves a lot of time To improve production efficiency.
In addition, for the printing of high-end carton, the level of waste is a very important issue. The production of waste products is mainly due to inaccurate color registration or poor color superposition. The color misregistration is mainly caused by the bending of the cardboard, the inclination and expansion of the printing plate, and the insufficient precision of the printing equipment. Of course, the cardboard will be somewhat deformed in production. We can't require it to be completely flat, so we need the printing machine to adapt and correct the cardboard as much as possible in the entire process of paper feeding and printing to achieve the best use effect. At present, high-end printing presses adopt vacuum absorption in the paper feeder section, and adopt a suction belt conveyor structure in the middle of the printing press, which greatly reduces the requirements for cardboard and achieves good results. In addition, the tilt adjustment of the printing plate is also very important. The printing of high-end carton requires high printing plate. When the printing plate of each color is impossible to install, it can ensure centering and leveling. The problem of centering can be adjusted by the axial adjustment of the printing roller Adjustment, but the general horizontal machine can not adjust. Therefore, when choosing a printing machine, it is best to choose a machine with a plate tilt adjustment system.
There are many factors for the quality of the color superposition effect: equipment, ink, scraper, cardboard, drying effect, operator's printing experience, etc. But for the printing press, the key problem of color superposition is inking. At present, the inking systems of high screen printing machines on the market are mainly divided into two categories: traditional rubber roller, anilox roller inking and blade system and chamber blade inking system.
The traditional rubber roller and anilox roller inking and scraping system adopts the method of rubber roller and anilox roller first inking, and then scraping the ink evenly with the scraper. In this way, in the field printing or low dot printing, the anilox roller and rubber roller can be used to directly inject ink. Due to the large amount of ink, the printing effect is better. When high dot printing is used, the doctor blade system is used at the same time, so that the amount of ink is uniform, and a good effect can also be achieved. This shows that the adaptability of this system is relatively large, and the ink content of the anilox roller can be changed within a certain range through the pressure adjustment between the anilox roller and the rubber roller, and the pressure of the scraper, so this system is suitable for high-end carton The printing effect is particularly outstanding.
In addition, the chamber scraper inking system is also a method of scraping ink that is currently widely used. This system is more suitable for printing products with the same network cable, but it is not easy to meet the requirements for product network cable replacement. Because the pressure of the ink scraping chamber directly affects the situation of ink leakage, the pressure adjustable range is relatively narrow, and it is difficult to adjust the ink content of the anilox roller through it. In this structure, if the machine is equipped with an anilox roller automatic replacement system, the anilox roller can be replaced according to the network line of the product, and high dot printing can also be completed together with the ink scraping chamber, but this model is not currently available in China.