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Analyze some key technologies that restrict waterless printing during the process of ordering cartons
In the process of ordering cartons, some key technologies for waterless printing are restricted. Although waterless offset printing technology is constantly developing, its development speed is far from being as fast as people expected. The main reason is that some key technologies have not been solved, such as plates, inks, Temperature control, etc.
1, plate.
The plate is the main consumable in printing production, which directly affects the production cost. The printing plate is the core of waterless offset printing. The waterless offset printing plate is different from the PS plate. Its surface is similar to the flat intaglio plate. It has the advantages of good ink reproducibility, vivid color, good print quality, etc. It is difficult, and the printing resistance is subject to the operating environment.
2. Waterless offset printing ink.
Waterless offset printing and inks used in water offset printing are no different in the choice of colorant. The main difference between them is that the resin used in the ink is the part of the binder. Due to the characteristics of waterless offset printing, the ink used has the following special properties compared with water offset printing inks.
(1) It is required to have higher viscosity and viscosity than water-based offset printing ink, so that it is possible to provide a larger ink cohesion to be greater than the force between the ink and the silicone rubber layer, so that the silicone rubber layer appears to be sparse. Oily, making it play the role of water in water offset printing.
(2) Must adapt to the special rheological properties of waterless offset printing. Because the waterless offset ink has a high viscosity, it will become more difficult to flow between the ink roller and the printing plate, which requires the ink to have better rheological properties.
(3) Due to the special influence of temperature in waterless offset printing, the waterless offset printing ink preferably has a relatively wide printing temperature range.
3. Temperature control system for waterless offset printing.
Another important component of the waterless offset printing system is its temperature control system, which is one of the most obvious differences between it and water offset printing on mechanical structures. In water offset printing, in addition to maintaining the balance of ink and water, another important function of the fountain solution is to take away the heat generated by the high-speed rotary friction of the printing plate, so that the printing plate can be kept stable and suitable for ink transfer. Within the temperature range. Since no water is used in waterless offset printing, a temperature control system is required to maintain a temperature range suitable for ink transfer.
The heat of waterless offset printing mainly comes from two aspects: one is the friction between the plate cylinder, the blanket cylinder and the impression cylinder; the other is the high viscosity of the waterless offset ink, which makes the ink roller and the ink roller Heat is generated by friction during the ink transfer process. If these heats are not eliminated in time, the temperature of the printing plate and the ink roller will rise sharply, and the rheological properties and viscosity of the ink will be greatly changed, resulting in extremely unstable conditions, so that the normal transfer of the ink cannot be completed.