During the printing of the composite packaging bag, it was suddenly found that the printing was white, so the operator began to increase the printing pressure! If the printing pressure gap is 4 mm, reduce the gap to 3 mm, or it is still white; continue to increase the printing pressure and adjust it to 2 mm. At this time, the cardboard has been flattened and the printing fonts are slurred, but the printing is still white
So the chief of the printing press rushed to find managers, and collectively studied the cause of Lu Bai. Ink problems? Cardboard problem? Device problem? Time passed by one minute and one second, so it took a lot of time and energy, and the problem was still not solved. In fact, it is not that the problem is difficult to solve, but that we have the wrong method in the operation, and we always start adjusting after the problem occurs.
So how do you avoid printing exposure and solve the printing exposure problem?
First, pre-press preparations are inevitable
1. Check whether the ink viscosity is normal before the ink is put on the machine
The common problem of printing dew is that the viscosity of the ink is too low, which is more likely to occur after many times of use. Because in the production process, the printing staff often add water to the ink tank, which causes the ink viscosity to decrease. As a result, printing is exposed, so the ink must be tested before using the machine.
2. Check whether the printed version is good
If the printing plate is used for a long time or the ink stain on the printing plate surface is too much, the ink transfer amount of the printing plate will be reduced. When the ink transfer amount is reduced, the printing dew phenomenon will often occur.
3. Anilox roller
The cleaning of the anilox roller directly affects the printing situation. A large part is that the clogging of the anilox roller has not been cleaned, so that the anilox roller has a small amount of ink, which leads to the phenomenon of printing whiteness.
Second, learn how to eliminate printing white
1. Check the thickness value of the unprinted cardboard first, and then check the cardboard thickness value after the cardboard comes out of the paper feeding unit to see if the cardboard is crushed by the paper feeding wheel. If it is crushed, first solve the problem of cardboard crushing, the paper feeding gap is cardboard thickness -0.3mm .
2. Check whether the printing plate pressure is normal, you can check whether there is enough ink on the printing plate surface. The printing plate hardness field plate is suitable for 34-36 degrees.
3. If the above is correct, increase the printing pressure value. The pressure value should not be too large. If it is too large, it will easily cause printing paste, and the printing will wear slowly and accelerate.
Of course, if the printing ink viscosity is correct, the printing plate and the anilox roll are good or the printing is white. The main adjustment direction is the ink process. The printing pressure should not be increased all the time. You can continue to increase the ink viscosity and ink permeability. It is also possible to adjust the printing machine to print in the interleaved paper feeding state.
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