Gravure printing carton pre-printing is to pre-print the desired fine pattern on the wide web (carton paper) by using the gravure printing technology before making the corrugated cardboard, and then printing the rolled surface. The paper is then made into a corrugated board production line, and then the die-cutting machine is used to die-cut the indentation into a box type.
        At present, in the international market, some 30% of the total output of corrugated boxes in Europe and the United States adopts pre-printing new technology. With the rapid development of China's paper product packaging industry, in recent years, many manufacturers such as Mengniu, Budweiser, Tsingtao Brewery, etc. have Focus on pre-printing new technology. With the stability of the design and consumption of corrugated boxes for beverages, beer, home appliances and food products, the production of high-grade color corrugated boxes by web preprinting will become the development trend of the packaging industry in the future.
       The difference between paper preprinting and lithographic offset printing production carton
       At present, most of the domestic color cartons use the sheet-fed offset printing pre-printing method. The process flow is: cutting the web into a single sheet of paper → printing a single sheet of offset paper → simultaneously rolling the second layer of the single-sided machine Corrugated board → face paper and single-faced corrugated board on the veneer or veneer veneer → die-cutting indentation molding → nail box / sticky box.
        The process of web gravure preprinting technology is: gravure printing machine printing surface paper roll → cardboard line production cut into three layers (or five layers) cardboard → die cutting indentation molding → nail box / sticky box.
        Why do we need gravure preprinting? There are two main reasons. One is that gravure can easily provide high-quality color prints; the other is that e-engraving technology greatly reduces the production cycle and cost of metal plate rolls, which is close to or even lower than flexo. Moreover, the people in the northwest of China have produced high-speed wide-format paper concave machines, and the price is only one-third of the imported flexographic printing machines. The gravure pre-printing method may be more suitable for the actual situation of China's packaging enterprises.
        In comparison, the printing process commonly used in the past is called “post-printing”, and pre-printing has some obvious advantages compared with post-printing:
        1, can obtain higher printing quality, more adaptable. Pre-printing is performed on a smooth paper surface by gravure printing machine or flexo printing, and compared with post-printing printing using a printing grooving machine on the surface of uneven cardboard, it is possible to carry out beautiful color printing with more layers and more vivid colors. Printing quality will be more stable and reliable.
        2. The corrugated board can be obtained with the highest strength. Since the pre-printing does not need to be stamped after the cardboard is formed, the corrugated deformation and the strength of the cardboard can be avoided. Printing with corrugated board printing slotting machine, because each color printing will make the corrugated board more or less deformed, and the more the number of colors, the greater the influence on the deformation of corrugated board.

        3, high production efficiency, easy to produce management, low scrap rate. Pre-printing has become an important trend in corrugated board printing, especially in high-end cartons, including large and shaped cartons.