Apply three-roller coating

Adhesive can be applied by three-roller coating or anilox roller. The relevant process parameters of rubber coating are shown in Table 2. The oven temperature and printing speed determine the dry conditions of the product.

Need to control the quality indicators are: 1 composite fastness; 2 surface roughness; 3 peel integrity.

The quality of the peeling process largely depends on the coating preparation of the base film, the coating layer, and the composite effect. The peeling process itself needs to control the degree of tightness and regularity of the collected film and ensure that the surface is free of scratches. The stripped PET base film can be recoated for transfer again, greatly reducing production costs.

(2) Connection compound transfer gravure printing process

Generally, after the composite paper has undergone a maturation period of 24 hours, the PET base film can be peeled off, so that the aluminum plating layer and the coating layer are transferred onto the base paper. However, the connecting transfer rotogravure printing line has a drying path of 16m and a maximum drying temperature of 200°C. After drying, it can be immediately cooled by double cooling rollers, which can fully achieve the desired composite and transfer effect.

Coating roller: The selection of the coating roller depends on the product being processed. The amount of glue applied directly affects the product quality, composite fastness, and peeling integrity.

Printing plate: Our company's connection compound transfer gravure printing production line should adopt the hollow version according to the original design, but at present many domestic printing enterprises have no good solutions to the problems that appear during the use of the hollow version. Its main drawbacks are: relatively long plate-making time and difficulty in machining; the version axis used by the plate-making factory cannot completely coincide with the axis axis of the printing plate, resulting in serious wear and tear in the long-term use, resulting in dynamic balance oscillation of the printing plate. Beyond the specified range, greater than 0.3mm, overprinting fluctuations are likely to occur during the printing process. Therefore, although the price of the bobbin version is slightly higher, from the viewpoint of product quality and process production, the hollow version should not be used as far as possible from the yield rate of the finished product. We have used the bobbin version instead.

UV glazing: Gravure printing on-line UV glazing technology has been very mature in China, but if we want to make the post-press processing without defects, we also need to consider it carefully before printing.

Since the UV coating must be subjected to the high-temperature baking of the UV lamp, the paper is often deformed, resulting in difficult post-printing registration. Therefore, in the pre-press process layout, we must consider the impact of the die-cutting position accuracy of the product and the deformation rate of the paper on the post-press processing.

The following is a brief introduction to the fine clamshell products in cigarette packs.

The maximum printing width of the connecting compound transfer gravure printing machine used in our factory is 820mm. Due to the high precision requirements for hot stamping, embossing, and die-cutting registration in post-press processing, the clamshell box uses 18 (3×6) when punching, and two single-knife lines in the horizontal row. 4mm double-knife; vertical 6-boxes, plus 4mm double-knife between 3 and 3. This imposition can increase or decrease the size of double-knife based on the deformation rate of the paper, which greatly eases the problem of inaccurate printing due to paper deformation.

New equipment, new technologies, new processes, and re-innovation are our common goals. Only by adopting advanced and even advanced technology can China's packaging and printing technology be quickly advanced to the international level.