With the rapid development of packaging industry, users have higher and higher requirements on the quality of corrugated boxes, including the printing quality of the sold cartons. If the printing technology is not well-controlled, there will often be many printing failures, such as "open bottom" and "white spots" when printing on the ground. In view of the many variables that cause the above problems, the following is a simple analysis from the factors of materials, processes, and plates.
1. Reasons for printing materials
1. The poor smoothness of facial paper and cardboard is the most fundamental reason for the problems of "imprinted printing", "open bottom" and "white spots".
The smoothness of the facial paper itself is poor, or the paperboard itself is poorly smooth due to the large amount of glue used during the composite or due to light or heavy "rubbing boards". The surface of the printing plate cannot be fully contacted with the facial paper during printing, resulting in The binder in the ink cannot completely fill the paper gaps. When the facial paper is printed on white plate paper, white small holes will appear, resulting in "open bottom" and "white spots".
In order to solve this problem, some manufacturers often adopt the method of increasing the printing pressure, but this will have great side effects: on the one hand, it will cause the deformation of the dots, and the obvious "edge effect" of the text and lines; on the other hand, the corrugated structure Will be damaged, reducing the strength of the carton.
Therefore, according to the customer's specific requirements for cardboard, choosing smooth paper with different smoothness, and at the same time controlling the process factors of forming the "rubbing board" during the production of cardboard are the fundamentals to solve the "imprinting", "open bottom" and "white spots" method.
2. The paper coating layer produces paper wool under the combined action of printing pressure and ink, which often causes "imprinted" and "white spots".
Solution: For paper boxes with higher requirements, choose paper with high surface strength; avoid large areas of the ground in the design of the layout; according to the surface of the paper, adjust the speed of the printing machine and the viscosity of the ink when printing, so as not to make the surface The occurrence of fluffing on paper avoids the occurrence of "white spots".
Second, the factors of technology
In the carton production line, the knife cuts from top to bottom during the single-edged trimming, which often causes the edge of the cardboard surface to be uneven. When performing full-page printing, the edge is not printed on the edge. Increasing the pressure during printing and ensuring the sharp edge of the edge when trimming, although this phenomenon can be alleviated, it cannot be completely eliminated.
3. Factors of plate material
The printing plates of carton printing machines usually use rubber plates and flexible resin plates (including domestic or imported), and there is a certain gap between the elasticity and inking ability of the two. Generally, the elasticity and inking ability of flexible resin plates are higher than that of rubber plates, and the printing ink layer is relatively thick. Generally, there will be no faults such as "imprinted", "open bottom", and "white spots".
The flatness of the surface of the printing plate is poor, resulting in a difference in the amount of ink on the plate, and the imprint will also appear "open" and "white spots".
Usually the flatness of the surface of the flexible resin plate is better than that of the rubber plate, so for the carton with higher printing requirements, large area solid or dot printing, the flexible resin plate must be selected for printing.
Copier Toner For Ricoh,Newly Compatible Printer Cartridge,Ricoh Mpc2503 Toner,Cheap Ricoh Toner Cartridge
jiangmen jinheng office equipment Co. Ltd. , https://www.jmjhtonercartridge.com