Multi-color coating printing machine (1)

With the increasing trend of the coating function provided by printing presses, the printing staff has turned the coating problem into an important production capacity problem in order to meet the increasing demands of customers. Now, this problem is not just a matter of coating, but what kind of coating can be used to achieve special quality results. The common trend of on-line coating is that most modern sheet-fed presses have coating tower devices installed. According to Heidelberg's statistics, approximately 85% of the Heidelberg six-color and 40-inch and above presses currently purchased have been equipped with coating towers, including several online configurations for packaging applications. And it is said that more than 90% of these printers use a balancing device for UV coating to provide waterborne coating services. With a counter press such as the SpeedMaster 74, the number of presses equipped with the coating function was reduced to 70%. Other printer manufacturers have also made the same trend. Komori said that 90% of the six-color and 40-inch presses they installed had coating capabilities. The relatively small number of 28-inch devices were introduced into the packaging industry (almost every one of these devices was equipped with a coating function), Komori sources said, about 80% of Komori's devices are equipped with coating devices. Most other sheet-fed press manufacturers also reported the same ratio. MAN Roland said that all the Roland 900 series have tower applicators installed. The effective sizes of these printers are 44-inch, 51-inch, and 56-inch models. When the new printing press was equipped with a coating function, the upgrade trend of the old printing press also showed the same interest. Commercial printers have found that printing equipment without coating capabilities may be at a disadvantage in the competition, so they would like to increase the number of coating installations for the previously purchased printers. For the issue of innovation, Dahlgren proposed that the last printing unit be used in conjunction with a rubber coating unit so that the final unit can be used as a coating or printing unit. This method, which limits the printing capacity of the press, allegedly used Dahlgren's LithoPlus unit to overcome this problem, as it allowed the final unit to be used for both coating and printing - this feature is especially true for four colors. Printing presses are very attractive. About 85% of Dahlgren's installations currently use aqueous coatings, although their interest in UV polishing is gradually increasing. Web printing presses for packaging printing - including offset printing, flexo printing and gravure printing equipment also install coating devices in various configurations from time to time. Publication roll presses for product catalogs or magazine prints rarely have coating devices. Web offset presses with heat setting, like the Heidelberg M600, mainly do high-end jobs such as small brochures and annual mailings, often with water-based coating devices. So why are all people so interested in this area? In recent years, the use of coating has grown rapidly because technology has provided a wide range of product and production capacity improvements. From an early glazing perspective, glazing part or all of a page's surface can create a luster that the human eye can see. This is a long-term, stable application process. Quite similarly, the coating can also be used to protect various printed products from the front cover to the packaging. In commercial printing processes, coating devices are often used to increase efficiency. For example, when printing on a sheet of paper, the paper must be discharged from the conveyor belt, stacked in piles, and then returned to the printer for a second printing after a short drying cycle. The use of the coating layer shortens the waiting time. . The printer has found that the coating process can help the job quickly pass through the printing unit and perform a second printing and binding process. This "production capacity" improvement device enables a very bright coating to be formed by rapid setting and has a protective effect on the underlying wet ink without affecting the gloss of the material and the surface condition of the paper. The coating increases the slippage of the paper and reduces dusting, accelerating the completion of the job during the bookbinding process. It is difficult to use the test results to illustrate the improvement of this kind of production capacity, but this process of increasing production capacity does exist. Waterborne coating is the most widely used. UV glazing is gaining popularity, and the electron beam method is used only on a small number of package printing web printing equipment. Each of these types of coating has its own characteristics, and there are many enthusiastic supporters. Taken together, as the printers adapt to the increasingly stringent environmental protection rules and the requirements of customers for high-quality print appearance and product protection, these coating forms have promoted a limited use of solvent-based coatings and coatings. In the market area. With the off-line glazing method gradually becoming a continuous chemical process, in some cases, double-layer glazing may be required.