In album printing, due to various reasons, there are many reasons for this kind of problem. Today, I'll give you a detailed introduction of the reasons for the printing of album.
1. Improper control of moisture content in the layout.
If the moisture 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 uniform transfer and coating of the ink. In this way, it is easy to cause plate dropping, and the excessive moisture content of the layout will make the printing ink lighter. If we blindly increase the ink flow to improve the ink concentration, it will cause excessive emulsification due to the large amount of water and ink Surface moisture is too small, it can not compete with the ink, so that the layout of the ink layer spread, will also cause paste version phenomenon.
2. Fountain solution pH is too strong.
If the fountain solution is too acidic, it will corrode the album printing sand, destroy the hydrophilic layer of the printing plate, and easily make the printed text and text be worn off in the process of pressure printing. Therefore, the pH value of the fountain solution is just about 5.
2. Ink viscosity is too high.
In the offset printing process, if the viscosity of the ink is too high, in addition to making it difficult to transfer the ink, it will also damage the condition of fracture in the middle of the ink layer, so that the remaining ink layer of the layout is insufficient. As a result, the graphic part of the printing plate will be exposed and worn, resulting in plate dropping.
4. Ink roller aging.
After the ink roller aging, the hydrophilic performance will be enhanced, and the hydrophilic ink performance will be weakened, resulting in poor transfer ink performance. In the process of mechanical rolling, the "oil in water" type of ink emulsification will be formed, and then the printing plate will be greasy and the printing image and text part of Wuhan picture album will be lost.
5. Equipment aging.
When the equipment is aging, some key parts are worn and loose due to poor lubrication, such as roller bearing head, bearing bush, gear parts, eccentric sleeve, etc. Then, in the process of pressing, the cylinder is easy to produce a small amount of vibration or sliding phenomenon, which aggravates 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 drop and paste.
In addition, the uneven blanket will also lead to album printing out of the phenomenon. When the blanket cushion is uneven or the package is not tight, there is a virtual loose situation, the surface of the bulge phenomenon, abnormal friction and damage to the plate film during imprinting, resulting in plate drop, paste phenomenon.
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