How to solve the problem of pass path in printing?

What is pass path?

Pass refers to the number of times the screen needs to be printed (coverage per unit area)—in simple terms, it means the number of times the print head runs to print a line of images when printing. It is the printing method of inkjet behavior, and 4pass is 4 passes. The higher the value, the higher the precision, but the slower the printing.

The pass path refers to the deep and shallow channel that appears drawn when printed, which is more common in large-area monochrome printing. This situation cannot be completely avoided in theory, because mechanical errors cannot be completely eliminated, but when the printing accuracy of the equipment is high enough, the naked eye cannot distinguish subtle differences and does not affect the printing effect.

1. Adjust feathering settings.

By adjusting the feathering settings, increasing the parameters can effectively reduce the generation of pass channels. Feathering can make up for the gaps of ink dots in the printing process, so that the ink printed on the material can be connected more smoothly and smoothly, and the influence of the pass channel can be reduced.

2. Clean the clogged nozzle.

If the nozzle is slightly clogged, the ink ejection cannot meet the requirements, which will also lead to the generation of pass channel. One is to keep the environment hygienic and reduce the clogging effect of dust in the air. Second, before printing or when the machine is on standby for a long time, the ink should be pressed for maintenance before printing, so as to reduce the possibility of pass lanes in wire drawing. The third is to check and clean the clogged nozzles. If you have no experience in this link, you can seek professional maintenance.

3. Use original or high quality ink.

The printing quality of UV flatbed printer will also be affected by ink quality. When printing, using original ink and ink with better compatibility can show better results, and the possibility of pass is less, and there will be fewer cases of pass due to differences in fusion and dryness.

4. Use uni-direction printing.

Different materials and different printing speeds will also affect the printing effect. If pass lanes appear in bidirectional printing, you can switch to unidirectional printing and reduce the printing speed, which can also effectively reduce the possibility of pass lanes.

5. Negative pressure ink supply is stable.

If the negative pressure is unstable, it may cause ink silt on the surface of the nozzle or air into the nozzle, resulting in broken ink in the nozzle, which is also one of the factors that cause PASS.

6. Machine precision control.

There are many mechanical reasons for the pass channel. Inaccurate stepping, inaccurate two-way, and inaccurate color registration will all cause deep and shallow channels. No matter what kind of problem causes the dark and light color difference, it can be summed up to one problem, which is the problem of drop point difference. To solve the problem of ink drop point deviation, one is to ensure the accuracy of equipment parameters and reduce mechanical errors; the other is to carry out regular maintenance on the long-term use of the machinery, to check and maintain the movement structure of the equipment to ensure that the components are not loose and unstable.