In the process of album printing, due to various reasons, there are many reasons for this problem. Today, let's introduce the reasons for the loss of album printing.
1. Improper control of page moisture size.
If the water content of the layout is too large, it means that the layout and ink roller have a thick water film, which will affect the normal and uniform transfer and coating of ink, which is easy to cause plate loss. Moreover, if the water content of the layout is too large, the printing ink will be lighter. Therefore, if we blindly increase the ink delivery to improve the ink concentration, it will cause excessive emulsification due to large water and ink, Moreover, if the moisture content of the layout is too small, it can not compete with the ink, so that the ink layer of the layout will spread, which will also cause the phenomenon of paste.
2. The pH of fountain solution is too strong.
If the acid of the fountain solution is too strong, it will corrode the sand mesh of the album printing, destroy the hydrophilic layer of the printing plate, and it is easy to grind off the printed pictures and texts in the press printing process. Therefore, the pH value of the fountain solution is just about 5.
2. The ink viscosity is too high.
In the offset printing process, if the viscosity of the ink is too large, in addition to making the ink transfer difficult, it will also destroy the conditions of fracture in the middle of the ink layer and make the remaining ink layer of the layout insufficient. As a result, the graphic part of the printing plate will be exposed and worn, resulting in plate loss.
4. Aging of inking roller.
After the aging of the inking roller, the hydrophilic performance will be enhanced, while the performance of the hydrophilic ink will be weakened, resulting in poor performance of the transfer ink. In the process of mechanical rolling, an ink emulsion of "oil in water" type will be formed, which will later lead to greasy printing plates and loss of printing pictures and texts in Wuhan album.
5. Equipment aging.
When the equipment is aging, some key parts are not well lubricated, resulting in wear and looseness, such as roller bearing head, bearing bush, gear parts, eccentric sleeve, etc. Then, in the process of pressing, the drum is easy to produce a small amount of vibration or sliding, which intensifies the friction and wear of the printing plate, resulting in the extrusion deformation in the process of imprint transfer, which indirectly causes the phenomenon of plate falling and pasting.
In addition, the uneven blanket will also lead to the phenomenon of plate loss in album printing. When the blanket pad is uneven or the package is not tight, and there is virtual looseness, the surface will bulge, and abnormal friction will occur during embossing to damage the plate film, resulting in plate dropping and plate pasting.济南印刷厂讲解的内容 更多的内容 请咨询公司官网http://www.xinfengyinshua.cn/