high temperature
Toner type digital printers are widely used in the on-demand printing process. When the fusion image is exposed on paper, due to the high temperature, the paper is prone to curling, drying, and sometimes blistering. If it is double-sided printing, such a process will be repeated twice, and the damage to the paper will be even greater. Therefore, it is extremely important to control the humidity of paper and the environment.
In addition, it is also possible to use a substance called fused oil, which is a high-viscosity silicone resin solution. Using it on paper ensures that the toner is combined with the paper material, and its effect is much better than that of a roller. Usually, these colorless liquids cause flicking on the coated material or in areas with thicker ink layers. When the liquid oil volatilizes, the tail flicker disappears, eliminating the need for ink drying time, which is also digitally printed. One major advantage.
Fused oil is different from ink, it will not scratch or rub when binding, but it is too smooth, it will bring some trouble to the paper, especially for some small printing machines in the field of fast printing. in this way.
Electrostatic charging
Since electrostatic charging is the core of laser/toner printing technology, common electrostatic control technologies, such as jetting and gold foil technology, are not well suited for digital printing applications. Similarly, electrostatic charging technology is also related to the temperature and humidity of the printing shop, and it is also the key to successful printing. Many companies set up an independent digital printing area to make environmental control easier and avoid excessive use of dusting. Unfortunately, the handling of paper is harder. If the outdoor temperature is zero while the paper is being transported, it should be moved to a workshop where the temperature has been controlled. The temperature is 25 degrees above zero, and the paper undergoes a temperature change. Temperature and humidity have a great influence on the electrostatic effect. If printing on paper that is prone to static electricity will produce deinking or white spots, the image will not transfer well and paper jams will also occur.
The ability of different thicknesses of paper to adapt to the surrounding environment is also very different. For example, a paper may need to adapt to the surrounding humidity and temperature overnight, and a forklift's paper may take a month to adapt to the environment. Therefore, when performing on-demand printing, special attention should be paid to the analysis of storage conditions. If paper is removed from the warehouse, consider drying the paper before entering the digital printing shop.
Binding
Common paper failures have the following four main characteristics:
1. Wrinkles, wave patterns
If the product produced has wave patterns, it is a poor quality product that is not acceptable to customers. Therefore, during the production process, it is necessary to pay close attention to the occurrence of wave or curling of the paper, which will cause great troubles for the post-processing process, especially for the equipment with a roller, such as a folder.
2. Paper breaks
Paper breakage is not a unique phenomenon in the digital printing process, but the phenomenon of paper breakage is even more pronounced in digital printing. This is because the image is floating on the surface of the paper instead of being absorbed by the paper during digital printing.
3. Paper peeling
Improper paper handling can cause paper peeling when printing on a toner type printer. In general, the paper peeling occurs when the image fusion is not sufficiently tight. Sometimes the peeling of paper is very obvious and sometimes it is very subtle. You only need to use your fingernail to gently cross the area of ​​the solid image to determine if this malfunction has occurred.
This problem is difficult to solve. Compared with four-color printers, monochrome machines are more prone to such problems. Printing with coated paper on black-and-white digital printers can easily explain this problem.
4. Scratches
When the paper passes through the device, it is prone to rubbing or scratches. If scratches appear on the cover, it will affect the quality of the entire book. Some printing machines are more likely to cause such problems due to the structure of the machine, so it is more necessary to carry out special processing on the paper in order to obtain high-quality prints. During offset printing, this problem can be avoided by coating or laminating. The cost of laminating digital printing products is relatively high.
Experiments have shown that if the color digital printer is matched with the appropriate paper, effective anti-friction effect can be obtained. This can not only effectively avoid failures, but also improve the competitiveness of production.
In the field of on-demand digital printing, on-line post-press processing is widely used, and some jobs do not require post-press processing at all, so that the rapidity of digital printing can be fully utilized. Otherwise, the above mentioned defects cannot be avoided. Sometimes the quality of printing is good, but friction or scratches can also occur during transport or mailing.
Brave New World
Some excellent digital printing machines have created new application areas and market scopes. Under such circumstances, consumers can have more flexible choices in paper parameters and prices, which is the basis for them to produce high-quality products.