In the printing process of picture albums, there are many reasons for the phenomenon of plate loss due to various reasons. Today, I will give you a specific introduction to the reasons for plate loss in Jinan picture album printing.
1. Improper control of moisture content in the layout.
If the moisture content of the layout is too high, it means that the layout and ink rollers have a thick layer of water film, which affects the normal and uniform transfer and coating of ink. This can easily cause plate loss, and excessive moisture content of the layout can also make the printing ink color lighter. If blindly increasing the ink output to increase the ink concentration, it will cause excessive emulsification due to high water content and ink, and if the moisture content of the layout is too small, it will not be able to compete with the ink, Spreading the ink layer on the layout can also cause a paste phenomenon.
2. The acidity and alkalinity of the fountain solution are too strong.
If the acidity of the fountain solution is too strong, it will corrode the sand mesh of the album printing, damage the hydrophilic layer of the printing plate, and easily cause the printed images and texts to be worn off during the pressure printing process. Therefore, the pH value of the fountain solution is just around 5.
2. Ink viscosity is too high.
If the viscosity of the ink is too high during the offset printing process, in addition to making it difficult to transfer the ink, it can also damage the condition of the middle fracture of the ink layer, resulting in insufficient remaining ink layer on the printing plate. As a result, the exposed and worn parts of the printing plate, causing plate loss.
4. Aging of the inking roller.
After the aging of the inking roller, the hydrophilicity will be enhanced, while the hydrophilicity of the ink will be weakened, resulting in poor ink transfer performance. During the mechanical rolling process, an "oil in water" type of ink emulsification is formed, which later leads to greasy printing plates and partial printing of images and texts in Wuhan picture albums.
5. Equipment aging.
When the equipment is aging, poor lubrication of some key components can cause wear and looseness, such as drum shaft heads, bearing shells, gear components, eccentric sleeves, etc. So, during the pressing process, the drum is prone to slight shaking or sliding, which exacerbates the friction and wear of the printing plate and plate, leading to the indirect occurrence of plate loss and paste caused by the compression deformation during the transfer of the imprint.
In addition, the unevenness of the rubber blanket can also lead to the phenomenon of plate loss in the printing of the album. When the cushion of the rubber blanket is uneven or the wrapping is not tight, there is a phenomenon of virtual looseness on its surface, which causes abnormal friction during embossing and damages the printing plate film layer, resulting in plate loss and pasting. For more information, please consult us http://www.lyjinshayun.com Come on!濟南印刷廠講解的內容 更多的內容 請咨詢公司官網http://www.lyjinshayun.com/