Starting from the characteristics of various parameters in the printing process, understand the faults that are easy to occur in the printing of double offset paper, and give solutions, and provide references.

1. Printing pressure is too low

The printing process is a process in which the printing plate selectively absorbs the ink and transfers the ink to the substrate through the blanket. However, due to the addition of paper wool and paper powder, the transfer of ink is hindered, so that the ink cannot be smoothly transferred to the substrate and remains on the blanket. By properly increasing the pressure between the three cylinders, forcing the ink to transfer to the substrate unconditionally, the problem of pasting the blanket can be solved. But while increasing the pressure between the cylinders, the durability of the printing plate should also be considered. When printing a large number of products, plate drying can be performed to increase the durability of the printing plate.

2. Uneven rubber layout

If the blanket and pad are used for too long, unevenness will appear. It is easy to accumulate paper wool and paper dust in the sunken places, causing partial paste on the blanket. In the sunken place, wipe the reducing agent or use 1 or 2 layers of transparent plastic tape to stick to the back of the blanket to restore its smoothness. If the phenomenon of partially pasting the blanket cannot be solved, the blanket and pad can only be replaced.

3. Poor fluidity of ink

If the fluidity of the ink is not good or too sticky, the peeling force on the paper surface will increase, the paper wool and paper powder on the paper surface can be easily peeled off, and then transferred to the printing plate, ink roller or ink through the blanket In the groove, causing a vicious circle. When printing large quantities of products, it should be cleaned in time according to the amount of paper wool and paper powder in the ink roller and ink tank, so as to ensure the durability of the printing plate.

Adding an appropriate amount of auxiliary materials (No. 6 oil or thinner) to the ink can increase the fluidity of the ink, and then add an appropriate amount of desalting agent, which also increases the mobility of the ink, so that the ink can be transferred to the printing well On the object, alleviate the phenomenon of rubber blanket.

In the case of the above, some operators may mistakenly believe that adding an appropriate amount of debonding agent can increase the fluidity of the ink, but adding the debonding agent also reduces the ink's mobility and makes it stick to the printing plate and rubber The ink on the cloth is difficult to clean, and the phenomenon of pasting the blanket will not be reduced.

4. The arrangement of printing color sequence is unreasonable

If it is a four-color machine, you can put the side with less graphics and less ink consumption on the front side, so that the paper wool and paper powder are left on the previous print.

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