The gravure printing carton pre-printing is to pre-print the corrugated cardboard box into corrugated cardboard using gravure printing technology, pre-print the required fine patterns on the wide web (carton face paper), and print the roll-shaped face paper The upper corrugated cardboard production line is made into corrugated box board, and then die-cutting and creasing is made into a box shape with a die-cutting machine.
At present, pre-printing technology is used for 30% of the total output of corrugated carton in some developed countries such as Europe and the United States. With the rapid development of China's paper product packaging industry, many carton factories with stable customers such as Mengniu, Budweiser and Tsingtao Brewery have The focus is on pre-printing technology. With the stable design and consumption of corrugated cardboard boxes for beverages, beer, home appliances and food products, the production of high-end color corrugated cardboard boxes using roll paper pre-printing will become the future development trend of the packaging industry.
The process flow of web pre-printing technology for gravure printing is: gravure printing machine printing surface paper roll → cardboard line production and cutting into three-layer (or five-layer) cardboard → die-cutting indentation molding → nail box / sticking box.
There are two main reasons for gravure pre-printing. One is that gravure can easily provide high-quality color prints. The second is that electronic engraving technology has greatly reduced the production cycle and cost of metal plate rollers, which is close to or even lower than that of flexo. Shaanxi Beiren has produced a high-speed wide-format paper gravure machine at a price of only one-third of the imported flexographic printing presses. The use of gravure pre-printing may be more suitable for the actual situation of China's packaging companies. Preprinting has the following advantages:
One is to obtain higher printing quality and wider adaptability. Domestically produced paper gravure inks are relatively mature, and have produced water-based paper gravure inks that can meet the pre-printing requirements of corrugated board lines, and can meet the 180 ℃ high temperature and hot plate friction on corrugated board production lines. Carry out large-format multi-color printing. The maximum format of traditional color offset printing is generally up to 1.2m × 0.9m (complex sheet), mostly four-color printing, the maximum material width of the unit-type gravure printing machine for carton pre-printing is 2.5 meters (including 1300mm, 1650mm, 1800mm, 2000mm , 2200mm, 2500mm), the printing color number can reach 4-10 color groups, and can also print gold ink, silver ink and other special inks.
The second is to obtain the highest strength of corrugated cardboard. Since pre-printing does not need to be embossed after the cardboard is formed, it can avoid corrugated deformation and weaken the strength of the cardboard. Since the production of corrugated boxes for pre-printing is completed on the production line, there is a certain heating molding time during the production. The final corrugated boxes produced have high strength, which can avoid uneven coating and ribbing of the carton during the production of the veneer machine. Cardboard warpage and other phenomena.
The third is high production efficiency, easy production management, and low scrap rate. In particular, the printing of high-end carton (including large and special-shaped carton) is suitable for long-run printing in large quantities. The pre-printed plates are all made of steel chrome-plated electrogravure gravure plate, and the number of printing resistance is 3 million to 4 million prints, which reduces the time of plate change and is suitable for large-volume long-form printing.
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