Intaglio printing carton pre-printing is to use intaglio printing technology in advance before corrugated carton is made into corrugated board, to pre-print the required fine patterns on the wide web (carton surface paper), to make corrugated board on the web printed surface paper by corrugated board production line, and then use die-cutting machine to die-cut and indentation to form the box. At present, some developed countries such as Europe and the United States are 30% of the total output of corrugated carton by preprint technology, along with the rapid development of modern paper products packaging industry in our country, in recent years, many clients stable cardboard-box factory such as mengniu, budweiser, tsingtao beer has set his sights on a pre-printed technology, such as drinks, beer, household appliances and food product packaging in the design and the dosage on the stability of the corrugated carton, The production of high-grade color corrugated carton by web preprinting will become the development trend of packaging industry in the future. The technological process of web gravure printing preprinting technology is as follows: gravure printing surface layer paper roll → board line production and cutting into three (or five) layers of board → die-cutting and indentation molding → nail box/stick box. There are two main reasons for gravure preprinting. First, gravure can easily provide high quality color printing; The second is the electronic engraving technology to make the metal plate roller production cycle and cost greatly reduced, close to or even lower than flexo. Domestic Shaanxi north people have produced a high-speed wide-format paper concave machine, the price is only one third of the import flexographic printing press, gravure preprinting may be more suitable for the reality of China's packaging enterprises. Pre-printing has the following advantages: one is to obtain higher printing quality, wider adaptability. The domestic production of paper gravure printing inks has been relatively mature, has been produced to meet the corrugated line preprinting water paper gravure printing inks, can meet the corrugated production line 180℃ high temperature and hot plate friction. Large format multi-color printing. The maximum width of traditional color offset printing is generally up to 1.2m×0.9m (Daqo zhang), and most of them are four-color printing. The maximum width of printing material is 2.5m (including 1300mm, 1650mm, 1800mm, 2000mm, 2200mm and 2500mm) of the unit gravure press used for carton pre-printing, and the number of printing colors can reach 4-10 color groups. At the same time can also be gold ink, silver ink and other special ink printing. The second is to enable the corrugated board to obtain the highest strength, because the pre-printing does not need to be embossed after the board molding, can avoid causing corrugated deformation and strength of the board weakened. Because the production of corrugated boxes for pre-printing is completed on the production line, there is a certain heating and molding time in the production, and the final production of corrugated boxes has high strength, which can avoid the phenomenon of uneven glue coating, carton stiffening, cardboard warping and other phenomena caused by the laminating machine production. The third is high production efficiency, convenient production management, low rejection rate. Especially high-grade carton (including large and special-shaped carton) printing, suitable for large quantities of long printing. The pre-printing plate is made of steel chrome-plated electric engraving gravure plate, with the printing resistance of 3 million to 4 million prints, which reduces the plate change time and is suitable for large and long printing.
