Web preprinting and lithographic offset printing carton difference

Web preprinting and lithographic offset printing carton difference

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At present, most of the domestic color cartons use the sheet-fed offset printing pre-printing method. The process flow is: cutting the web into a single sheet of paper → printing a single sheet of offset paper → simultaneously rolling the second layer of the single-sided machine Corrugated board → face paper and single-faced corrugated board on the veneer or veneer veneer → die-cutting indentation molding → nail box / sticky box.

The process of web gravure pre-printing technology is: gravure printing machine printing surface paper roll → cardboard line production cut into three layers (or five layers) cardboard → die cutting and indentation forming → nail box / sticky box.

There are two main reasons for using gravure pre-printing. One is that gravure can easily provide high-quality color prints; the other is that e-engraving technology can greatly reduce the production cycle and cost of metal plate rolls, close to or even softer. Version. Moreover, the people in the northwest of China have produced high-speed wide-format paper concave machines, and the price is only one-third of the imported flexographic printing machines. The gravure pre-printing method may be more suitable for the actual situation of China's packaging enterprises.

In comparison, the printing process commonly used in the past is called “post-printing”, and pre-printing has some obvious advantages compared with post-printing:

1. Can obtain higher printing quality and more adaptability. Pre-printing is performed on a smooth paper surface by gravure printing machine or flexo printing, and compared with post-printing printing using a printing grooving machine on the surface of uneven cardboard, it is possible to carry out beautiful color printing with more layers and more vivid colors. Printing quality will be more stable and reliable.

2. The corrugated board can be given the highest strength. Since the pre-printing does not need to imprint the cardboard after it is formed, the corrugation deformation and the strength of the cardboard can be avoided. Printing with corrugated board printing slotting machine, because each color printing will make the corrugated board more or less deformed, and the more the number of colors, the greater the influence on the deformation of corrugated board.

3. High production efficiency, easy production management, and low scrap rate. Pre-printing has become an important trend in corrugated board printing, especially in high-end cartons, including large and shaped cartons.