The pre-printing of gravure printing carton is to pre-print the corrugated carton into the corrugated cardboard before using the gravure printing technology on the wide-web paper (carton paper), and then print the paper on the roll. 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, 30% of the total output of corrugated cardboard boxes in some developed countries such as Europe and the United States is using pre-printed new technology. With the rapid development of China's paper product packaging industry, in recent years, many customers have stabilized carton factories such as Mengniu, Budweiser, Qingdao Beer has set its sights on new pre-printing technology. With the stable design and consumption of corrugated cardboard boxes for beverages, beer, home appliances and food, the production of high-end color corrugated cardboard boxes by roll paper pre-printing will become the future packaging Industry trends.
Web preprinting is better than flat offset preprinting
At present, the vast majority of color cartons in China use flat sheet offset printing pre-printing. The process is as follows: cut the roll paper into a single sheet of paper â†’ offset printing a single sheet of paper â†’ simultaneously using a single-sided machine to roll two-layer corrugations Cardboard â†’ facial paper and single-sided corrugated board mounted on the veneer or veneer veneer â†’ die-cutting and creasing forming â†’ nail box / sticking box
The process flow of pre-printing technology for web gravure printing is: gravure printing machine printing surface paper roll â†’ cardboard line production and cutting into three-layer (or five-layer) cardboard â†’ die-cutting indentation molding â†’ nail box / sticking box
So why do you need gravure preprinting? There are two main reasons, one is that gravure printing can easily provide high-quality color prints; the second is that the electronic engraving technology makes the production cycle and cost of metal plate rollers greatly reduced, close to or even lower than flexo. Moreover, Shaanxi Beiren has produced a high-speed wide-format paper gravure machine at a price only one-third of that of imported flexographic printing presses. The use of gravure pre-printing may be more suitable for the reality of China's packaging companies.
In comparison, people usually call the commonly used printing process "post-printing". Compared with post-printing, pre-printing has some obvious advantages:
â€”â€”A higher printing quality can be obtained and the adaptability is wider. Pre-printing uses a gravure printing machine or flexo printing on a smooth paper surface. Compared with post-printing using a printing slotting machine to print on an uneven cardboard surface, it can perform fine color printing with richer layers and brighter colors, and Printing quality will be more stable and reliable.
â€”â€”Corrugated cardboard can get the highest strength, because pre-printing does not need to imprint the cardboard after it is formed, which can avoid corrugated deformation and weaken the strength of the cardboard. After corrugated cardboard printing and slotting machine is used for printing, because each color printing will cause corrugated cardboard to be more or less deformed, and the more colors, the greater the impact on the corrugated cardboard deformation.
â€”â€”High production efficiency, easy for production management, and low scrap rate. Pre-printing has become an important trend in corrugated cardboard printing, especially the printing of high-end carton (including large and special-shaped carton).
Compared with the traditional color offset printing method, the production method using gravure printing carton pre-printing has the following significant features:
--high productivity. The printing speed of gravure printing web is up to 150-200m / min, which is basically matched with many corrugated cardboard production lines in China, which is shorter than the offset printing and veneer mounting tile of traditional flat sheet paper, with low labor cost and high efficiency.
â€”â€”The color carton produced by gravure printing pre-printing can obtain high-quality ink-printed products. Due to the high accuracy of gravure printing, no more than 0.2mm, gravure printing can also complete printing and varnishing at one time. Up to 300 lines, the amount of inking ink is larger than other printing methods, up to 4.5-6g / m2, the ink color of the printed product is full, soft, bright and firm, and there is a sufficient drying system for each color after gravure printing. Therefore, under the premise of selecting paper with a high surface smoothness for printing, gravure printing can obtain a high quality of ink printing.
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