In album printing, printing will be caused by various reasons. There are many reasons for this phenomenon. How to solve this problem is very important. Today, Xiaobian will share some methods with you, hoping to help you!
One of the reasons for the lack of plate in album printing
1. Ink viscosity
In the offset printing process, if the viscosity of the ink is too large, it will not only cause the difficulty of ink transfer, but also cause the ink layer, the middle situation, so that the remaining ink layer is not enough, the result is to make the text part of the plate plate plate naked through, resulting in the plate.
II. PH value of runban solution
If the acid is too strong, it will corrode the printing plate sand and destroy the hydrophilic layer of the printing plate, which is easy to make the print and text fall off in the process of printing. Generally, the pH value of the fountain solution is about 5.
The second reason for the lack of album printing
If the plate pressure on the ink roller is too small, the ink is not enough on the plate, the adjustment of the ink layer, graphics and text components will be worn.
If the pressure between the ink roller and the plate is too large, it will accelerate the abrasion of the plate image and text, so that the sand on the plate is damaged, the blank on the plate is dirty, and the image and text on the plate is rough, which leads to the problem of the plate.
4. Ink roller
After the aging of the ink roller, the hydrophilicity can be enhanced, while the ink promoting performance becomes weak, and the ink transfer performance becomes poor. In the process of mechanical rolling, the emulsion of "oil and water" type ink is formed, which results in greasy dirt on the plate and the printing text.