Shenzhen Huaxu Machinery Co., Ltd

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 discuss the problems encountered by manufacturers.
(Huaxu Machinery Waste Cleaning Machine Co., Ltd.)

Generally speaking, production efficiency is mainly restricted by pre-preparation, printing speed, plate change time and other issues. Pre-preparation includes the adjustment of printing plates, the configuration of inks, the adjustment of various pressures, and the adjustment of color registration. Because it is the printing of high-end cartons, each link has relatively high requirements, which is relatively time-consuming and laborious. In addition, the speed is determined by the machine itself. Generally, due to the very high requirements for color registration accuracy and color superposition of high-end carton printing, the machine speed is not as fast as printing ordinary cartons. In addition, the cardboard of high-end cartons is mostly thin, and the requirements for paper feeders are relatively strict, so the speed will also be subject to certain restrictions.
(Huaxu Machinery Waste Cleaning Machine Co., Ltd.)

At present, as market products tend to be multi-variety and small-batch production, the impact of plate change time on production efficiency is increasing. General printing machines use track structures. When changing and wiping plates, each color machine needs to be separated, and then merged together after changing plates, which invisibly wastes a lot of time. To overcome this problem, most of the high-end printing machines at home and abroad now adopt a unit-independent structure. The unit is fixed. When changing and wiping the plate, you only need to open the door between the units to complete all the work, which reduces a lot of time and improves production efficiency.

In addition, for the printing of high-end cartons, the scrap rate is a very important issue. The generation of scrap is mainly caused by inaccurate color registration or poor color superposition. The inaccurate color registration is mainly caused by bending of cardboard, tilting and telescoping of the printing plate, and insufficient precision of the printing machine equipment. Of course, the cardboard will be deformed to some extent during production, and we cannot require it to be completely flat, so the printing machine needs to adapt to and correct the cardboard as much as possible during the entire process of paper feeding and printing to achieve the best utilization effect. Now high-end printing machines use vacuum adsorption in the paper feeder part, and a suction belt conveyor structure in the middle of the printing machine, 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 cartons has high requirements for the printing plate. It is impossible to ensure the centering and level of each color printing plate when it is installed. The centering problem can be adjusted by the axial adjustment of the printing roller, but the horizontal direction of the general machine cannot be adjusted. Therefore, when choosing a printing machine, it is best to choose a machine with a tilt adjustment system for the printing plate.
(Huaxu Machinery Waste Cleaning Machine Co., Ltd.)

There are many factors that affect the quality of color superposition: equipment, ink, scraper, cardboard, drying effect, operator's printing experience, etc. However, for a printing machine, the key issue of color superposition lies in inking. At present, the inking system of high-line printing machines on the market is mainly divided into two categories: traditional rubber roller, anilox roller inking plus scraper system and chamber scraper inking system.

The traditional rubber roller, anilox roller inking plus scraper system uses a rubber roller and anilox roller to first ink, and then use a scraper to evenly scrape the ink. This method can use anilox rollers and rubber rollers to directly ink when performing solid printing or low-dot printing. Due to the large amount of inking, the printing effect is better. When high-dot printing is performed, a scraper system is used at the same time to make the ink application uniform, which can also achieve good results. This shows that this system has a large adaptability. The ink content of the anilox roller can be changed within a certain range by adjusting the pressure between the anilox roller and the rubber roller and the pressure of the scraper, so this system is particularly effective for high-end cartons.

In addition, the chamber scraper inking system is also a widely used scraping method. This system is more suitable for printing products with the same mesh line, but it is not easy to meet the requirements for replacing the product mesh line. Because the pressure of the scraper chamber directly affects the ink leakage, the adjustable pressure 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 automatic anilox roller replacement system, the anilox roller can be replaced according to the different product mesh lines, and high-dot printing can be completed together with the scraper chamber, but this model is not available in China at present.

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