[China Packaging Network News] Printing exposure often occurs in production, which is time-consuming and labor-intensive and also affects production efficiency. When exposure occurs, many factories focus on how to solve it, but forget that only minor adjustments need to be made before operation, which can be completely avoided.

When the printing bleaching appears uuuuuuuuuuuuu

In the process of printing, it suddenly appears that the printing is white, so the operators begin to increase the printing pressure! uuuuuuuuuu If the printing pressure gap is 4 mm, reduce the gap to 3 mm, or expose; continue to add printing pressure, adjust to 2 mm, by this time the cardboard has been squashed, the print font is pasted, but the printing is still exposed.

So the printer came to the managers to study the causes of dew. Ink problem? Cardboard problem? Equipment problems? As time passed by, a lot of time and energy were spent, and the problem remained unsolved. In fact, it is not a problem that is difficult to solve. There are some wrong methods in our operation. It is always a problem that we begin to adjust.

So how to avoid printing exposure and solve the problem of printing exposure?

First, prepress preparation is inevitable.

1. Check the ink viscosity before putting it on the machine, whether it is normal or not.

One of the common problems of printing dew is that the ink viscosity is too low, which is easier to produce after many times of use. Because in the production process, the printer often adds water to the ink barrel, which leads to the decrease of ink viscosity. Therefore, it is necessary to test the ink before going to the computer.

2. Check whether the printing plate is in good condition.

If the printing plate is used for a long time or the ink dirt on the printing plate is too much, the ink transfer amount of the printing plate will be reduced. When the ink transfer amount is reduced, the phenomenon of printing bleaching will occur frequently.

3. Screen Roller

The cleaning of the screen roller directly affects the printing situation, a large part of which is that the blockage of the screen roller has not been cleaned up, so that the ink load of the screen roller is small, which leads to the phenomenon of printing bleaching.

2. Learn how to eliminate the exposure of printing

1. First check the thickness of unprinted cardboard, and then check the thickness of cardboard after it comes out of the feeding unit to see if the cardboard is crushed by the feeding wheel. If the crushing problem is solved first, the feeding gap is - 0.3mm.

2. Check whether the printing press is normal, you can check whether the printing plate has enough ink. The hardness of the printing plate is suitable for the field version at 34-36 degrees.

3. Above all, the printing pressure value should not be too high. It is easy to produce printing paste when the pressure value is too large, and the slow wear and tear of printing will be accelerated.

Of course, if the viscosity of printing ink is correct, printing plate and screen roller are good or there is a phenomenon of printing bleaching. The main direction of adjustment is to take ink technology as the dominant factor. Printing pressure should not always increase, and ink viscosity and ink permeability can continue to be improved. The printing press can also be adjusted to separate sheet feeding for printing.