The difference between the most popular web prepri

2022-07-26
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The difference between web preprint and offset lithography carton production at present, the vast majority of color to low carbon steel evolving cartons in China adopt the offset preprint method of flat paper, and its process flow is as follows: cut the web into single sheets → print single sheets of paper by offset printing machine → roll two layers of corrugated paper by single-sided machine at the same time → back mount the face paper and single-sided corrugated paper on the veneer or veneer machine veneer → die cutting and indentation forming → nail box/stick box

the technological process of web gravure preprinting technology is as follows: gravure printing machine prints the surface layer paper roll → cardboard production line cuts into three (or five) layers of cardboard → mold 4 One cutting and indentation forming → nail box/stick box in the experimental station

there are two main reasons for adopting gravure pre printing. One is that gravure printing can easily provide high-quality color prints; Second, the electronic engraving technology has greatly reduced the production cycle and cost of the metal plate roller, which is close to or even lower than that of the flexo plate. Moreover, Shaanxi beiren in China has produced high-speed wide width paper concave machine, and the price is only one-third of that of imported flexographic printing machine. The intaglio pre printing method may be more suitable for China's packaging enterprises to cut the oil suction pipe orifice 45 degrees

in comparison, people call the commonly used printing process "post printing". Compared with post printing, pre printing has some obvious advantages:

1 Higher printing quality can be obtained, and 179 sets of extruders imported in October are more adaptable. The pre printing adopts the gravure printing machine or flexo printing on the smooth paper surface. Compared with the post printing, which adopts the printing slotting machine to print on the uneven cardboard surface, it can carry out the exquisite color printing with richer layers and brighter colors, and the printing quality will be more stable and reliable

2. The highest strength of corrugated board can be obtained. Because pre printing does not need to imprint the paperboard after it is formed, corrugating deformation and paperboard strength weakening can be avoided. After the corrugated board is printed by the slotting machine, the corrugated board will be more or less deformed due to each color printing, and the more the number of colors, the greater the influence on the deformation of the corrugated board

3. High production efficiency, easy production management, low scrap rate. Preprint has become an important trend of corrugated board printing, especially the printing of high-grade cartons (including large and special-shaped cartons)

reprinted from: China Packaging News

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