Method and printing equipment for reducing printing color differences of metal printing plates

Abstract

The invention relates to the technical field of surface coating of metal plates, in particular to a method and printing equipment for reducing printing color differences of metal printing plates. According to the scheme, at least one printing process includes the steps that a carved plate roller is coated with printing ink and then a rubber transfer roller making contact with the carved plate roller transfers and prints the printing ink onto the metal plates, the process further includes the steps that after the redundant printing ink on the carved plate roller is collected and then coats thecarved plate roller in a circulating manner and a cleaning roller soaking in a cleaning solution is used for cleaning the part transferred and printed by the rubber transfer roller, and a printing inkbarrel is supplemented with the equal mass of a solvent according to volatile quantity data, measured in real time, of the solvent in the printing ink; the cleaning degree and the uniform degree of the cleaning solution in a cleaning solution containing disk are maintained unchanged in real time; the corresponding equipment comprises a solvent supplementing device, the solution containing disk comprises a slope-shaped bottom and the bottom sinking trough so as to collect and discharge printing ink molecules depositing in the cleaning solution, and the solution containing disk is uniformly supplemented with the cleaning solution in the length direction of the solution containing disk.

Description

technical field [0001] The invention relates to the technical field of surface coating of metal plates, in particular to a method for reducing printing color difference of metal printing plates and printing equipment thereof. Background technique [0002] Metal printed decorative panels have been widely used in construction, transportation, and medical and health industries. This kind of metal printed decorative panels is an integrated thermal insulation board. It has a new installation method that can replace traditional wood and stone patterns. It is suitable for building interiors and exteriors. In public areas such as wall decoration, airports, subways, shopping malls, etc., the metal printing plate generally includes a metal plate base layer and a printing composite layer set on the metal plate base layer. According to the printing requirements, the metal strip is oiled and dried on the printing equipment. , re-oiling and re-drying to form the desired pattern color. Sin...

AI Technical Summary

Problems solved by technology

[0002] Metal printed decorative panels have been widely used in construction, transportation, and medical and health industries. This kind of metal printed decorative panels is an integrated thermal insulation board. It has a new installation method that can replace traditional wood and stone patterns. It is suitable for building interiors and exteriors. In public areas such as wall decoration, airports, subways, shopping malls, etc., the metal printing plate generally includes a metal plate base layer and a printing composite layer set on the metal plate base layer. According to the printing requirements, the metal strip is oiled and dried on the printing equipment. , re-oiling and re-drying to form the desired pattern color. Since the entire printing production line is long and continuous production, the process factors involved are complex and the parameters are prone to uncontrollable changes. It is easy to cause color difference between the front and rear printing patterns on the metal plate. The color difference may not be seen in the printing at similar positions, but the color difference will exist in the patterns at the farther positions on the whole roll of strips, especially at the ends of the head and tail. Obvious color difference. During subsequent processing, the whole roll of printed boards is cut into standard blocks after compounding. When the blocks with color difference are spliced ​​together, the appearance is affected, and the functions of the decorative board are lost. Rich construction experience The personnel will choose to use it, or put the color difference board at a position far away from the line of sight. Even so, it will affect the construction quality and efficiency. For the production enterprises that pursue high quality, solving the color difference problem of the printing board can improve the popularity of the product and improve user experience

[0003] Analyze the various reasons for the color difference, and find two reasons that are easily overlooked, that is: 1. The problem of solvent in the ink. After the ink is applied to the engraved roller, the excess ink will be scraped up by the scraper from the engraved roller. The two ends fall down and flow back to the ink barrel. Due to the process of recycling the excess ink after reflowing, and the presence of volatile solvents in the ink, as the solvent continues to decrease, the color of the ink will change from light to dark. In addition, due to the metal The plate will be heated before printing. When the equipment is turned on for printing, the temperature of the engraved roller will rise due to the transfer of heat from the metal plate. As the temperature rises, the volatilization speed of the solvent in the excess ink on the engraved roller is also accelerating. Eventually 2. The problem of the cleaning device of the transfer rubber roller. Since the cleaning roller is immersed in the liquid pan, the residual liquid of the liquid in the liquid pan will be left on the cleaning roller. It will be brought into the next transfer. If the color of the cleaning liquid in the liquid pan changes, it will inevitably cause color difference on the printing plate. To ensure that the cleanliness and uniformity of the cleaning liquid in the liquid pan remain unchanged should be important means

[0004] attached figure 1 and 2 It shows the existing printing methods and corresponding devices. According to the requirements of the pattern, there may be several printing processes, and each printing needs to be dried once. There may be several such printing devices on a printing production line; now Some cleaning devices such as figure 1 and figure 2 , is to set a cleaning liquid outlet above the contact between the cleaning roller and the transfer rubber roller, the falling cleaning liquid washes at the contact point and flows into the liquid pan, and the cleaning liquid in the liquid pan is pumped to the liquid outlet, The liquid intake port of the pump is located on the upper part of the liquid pan, so that the ink molecules deposited at the bottom of the liquid pan will not be extracted. Among them, the liquid pan is flat-bottomed, which is an ideal and easy-to-think cleaning method, but cleaning The cleanliness of the liquid is not guaranteed throughout the process, so, in fact, there are still color differences in the printed plates produced;

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