Improve the printing quality of carton (top)

As we all know, the key factors affecting product quality are equipment, raw materials, personnel, and the environment. The same applies to the carton packaging industry. Many companies are commendable in order to create high-quality brands, spare no expense, update equipment, carry out technological advancement, strictly control the entrance of raw paper to the factory, and sincerely recruit talents from all over the world to improve the working environment. However, they are good at research, good at creating, and good at doing. Interested people will also benefit greatly. Here only a brief description of the experience of improving carton quality from the point of view of ink printing.
First, to ensure the clarity of printing First, the printing plate should be made of wear-resistant, moderately elastic, high-quality materials. The thickness of the same plate should be the same, the thickness of the resin plate should not be less than 4 mm, and the rubber plate should be 6 to 7 mm. optimal. Regardless of whether it is to use a dark film or a handmade knife, the layout must be neat, the pattern must be written, and the line depth should be no less than 3 mm. The arrangement of the text patterns should not be overcrowded. The arc should be sleek, uniform in thickness and straight and straight. Smooth. When printing, the ink should be properly lightened, the ink layer of the ink coating roller should not be too thick, and the pressure of the roller is moderate, so that the printing ink is even and the surface of the ink box has no obvious dent. Do not increase the ink concentration, increase the pressure of the ink roller to improve the printing effect. This not only fails to achieve the ideal purpose, but causes the printing area to be smeared and the printing quality is worse. Especially the text is small, the pattern is complicated, the lines are delicate, and the printing requirements are With high-precision layout, the disadvantages are even more obvious; the speed of the printing press cannot be lower than 800 rpm/miN. Too fast ink is too thick, the layout is easy to blur, but also to prevent paper hair, paper scraps, etc. into the printing press stick to the printing plate, if there is a piece of paper glue sticking, to stop immediately, wipe with a rag and dip in alcohol.
Second, the printing color should be pure, the quality of bulk colorless water-based ink is related to the carton printing the key to pure, bright, so be careful when choosing. There is no significant difference between high-quality ink and color scale, delicate touch, sticky silk, concentration suitable for water or alcohol solvent dilution without precipitation, agglomeration phenomenon, stirring with a wooden stick without foam, mixed with other ink color, good affinity, no phase Solubility, pure ink, no abnormal reaction. On the contrary, it cannot be used.
It is best to print batches at one time when printing, otherwise, the same barrel of ink is used, and color differences also occur. The reason is that the original ink is diluted with water or an alcohol solvent and is not sealed. When it is exposed to the air for a long time, the chemical components in the ink react with the oxygen in the air, that is, the pigment is reduced, and the strong light can also decompose the ink. 
Third, to prevent the application of whiteboard carton printing overprinting, ghost coating whiteboard paper in the manufacture of coating liquid for coating whiteboard containing glue, high-grade white paper surface also coated with a small amount of coating wax, so use whiteboard to do When the carton of cardboard is printed, slippage occurs at the instant when the plate comes into contact with the whiteboard. In addition, the pressure of the printing plate is too heavy, the water-based ink is not easy to infiltrate, and the printed carton ink is dried slowly. The printing job is continuous, and the printing products are stacked one on top of the other.
To solve this problem, the ink should be lightened with ethanol, do not use water, because it is not volatile, is not conducive to the drying of the ink; printing pressure is properly reduced, the printing speed should not be too fast, not more than 600 rpm / miN is appropriate. Before the stacking of printing presses, an exhaust fan or hot air drying box ink is installed. 
Fourth, to ensure the accuracy of overprinting
The overlay accuracy depends first of all on the precision of the equipment and the adjustment of the feeding section to push the paperboard in parallel. In addition, it is the layout production, assembly and correction. The following is a discussion of overprint accuracy in terms of layout collage. (to be continued)