Gravure printing carton preprinting process advantages

Preprinting of gravure printing cartons preprints the corrugated cardboard boxes into corrugated cardboard beforehand. Gravure printing technology is pre-printed on the wide web (cardboard facing paper), and the desired pattern is printed in advance. The upper corrugated board production line is made of corrugated boxboard, and then die-cut by a die-cutting machine into a box type.

At present, 30% of the total output of corrugated cartons in some developed countries, such as Europe and the United States, use preprinting technology. With the rapid development of China's paper product packaging industry, in recent years, many stable carton manufacturers such as Mengniu, Budweiser, and Tsingtao Beer have Looking toward preprinting technology, with the packaging and packaging of beverages, beer, home appliances and foodstuffs in the design and usage of corrugated boxes, the use of web preprinting to produce high-grade colored corrugated boxes will become a trend in the future of the packaging industry.

The technological process of the web gravure printing preprinting technology is: gravure printing machine printing surface layer paper roll → cardboard line production cut into three (or five) cardboard → die-cutting indentation molding → nail box/glue box.

There are two main reasons for gravure preprinting. One is that gravure printing can easily provide high-quality color prints; the other is that electronic engraving technology enables the production cycle and cost of metal plate rolls to be greatly reduced, close to or even lower than the flexographic version. The domestic Shaanxi Beiren has produced high-speed wide-format paper concave machines, the price of which is only one-third that of imported flexographic printing machines. The use of gravure pre-printing methods may be more suitable for the actual situation of packaging companies in China. Preprinting has the following advantages:

One is to obtain higher print quality and more adaptability. Domestically produced paper gravure inks are relatively mature, and water-based paper gravure inks that can be used to pre-print corrugated paperboard lines have been manufactured to meet the 180°C high temperature and hot plate friction of corrugated board production lines. Large-format, multi-color printing. The maximum size of traditional offset printing is generally up to 1.2m×0.9m (pan) and mostly four-color printing. The maximum printing material width of the gravure printing machine for carton preprinting is 2.5 meters (Shaanxi Beiren Printing Machinery Co., Ltd. Production of a variety of specifications of the prepress, including 1300mm, 1650mm, 1800mm, 2000mm, 2200mm, 2500mm), the number of print color up to 4-10 color group, but also for gold ink, silver ink and other special ink printing.

The second is to maximize the strength of corrugated board, because the pre-printing does not need to be imprinted after the board is formed, which can avoid the deformation of the corrugated board and the weakened board strength. Since preprinted corrugated cartons are produced on the production line, there is a certain amount of heat-forming time during the production, and the final production of corrugated cartons is of high strength, which can avoid uneven coating and cramping of the carton when it is produced. Cardboard warping and other phenomena.

The third is high production efficiency, ease of production management, and low scrap rate. In particular, the printing of high-grade cartons (including large and special-shaped cartons) is suitable for large-volume long-run printing. The pre-printed plates are all made of steel chrome-plated electric gravure plates. The number of print-resistant prints is 3 to 4 million prints, which reduces the change time and is suitable for large-volume long-lived prints.