White point! White point! White point!!!
Is it troubled by the white point problem in the printing process?
It’s not terrible to meet white spots.
Learn the following tricks, the right medicine!
White spots run light!
It is common to print white spots caused by paper or dust caused by paper or dust. Printing white spots caused by dust in the printing environment are usually obvious and fixed. However, the white spots caused by the paper hair are not so regular. Generally, there are not many white spots at the beginning. After printing for a period of time, there will be more and more, and there will be obvious white paper on the pressure roller of the machine feeding part. Hair, paper scraps.
In the case of such problems, you need to analyze the specific reasons. If there is more dust in the printing environment, the workshop needs to be cleaned. The most effective way is to sprinkle the water and mopping the floor. Under normal circumstances, there can be obvious improvement. If it is a printing white point caused by paper or paper dust on the surface of the paper, a dusting cloth can be added to the paper feeding portion of the machine to reduce the generation of white spots. For the product quality requirements are particularly strict, you can also print the primer ink first before printing, which can play the role of pressing the paper to reduce the incidence of white spots.
Printing white spots caused by the falling of the printing material can also produce printing white spots. Different from paper wool and paper dust, the powder of the printing material is insufficient in surface strength, which causes the ink to stick the tiny powder particles on the surface of the printing material during the printing process, thereby forming white spots. The performance of such problems is that the number of white spots is small and the location is not fixed. Looking at the magnifying glass, there is almost no ink in the white dot portion. This is because the fine powder on the surface layer of the material is stuck by the ink, and a slight depression is formed, and the ink cannot cover it.
When you encounter such problems, you can solve them by reducing the viscosity of the ink. If the effect is not obvious, the qualified company can also print a layer of primer ink or eliminator on the surface of the printing material to solve the problem of powder drop. Because the primer ink and the smear agent can cover the surface of the printing material, which is equivalent to scraping a layer of putty on the surface of the printing material, and the ink printed on the back is actually printed on the primer ink or the varnish coating. Effectively reduce the printing white spots caused by the falling of the printing material.
Printing white spots caused by uneven materials Sometimes uneven surface of the printing material can also cause white spots to be printed. The main manifestation of printing white spots caused by this reason is that the white spots are more and more dense. When viewed under a magnifying glass, the printed surface will be found throughout the dense white spots.
In the case of such problems, the flatness of the surface of the printing material can be increased by printing the undercoat ink to solve the white point problem. Of course, for some large solid pattern labels , the process of printing the solid portion twice can also be used to solve the white point problem.
Printing white spots caused by static electricity Some film-type self-adhesive materials will generate static electricity during the printing process, and static electricity will push the ink away, which will also cause white spots. The white point caused by this phenomenon is observed under a magnifying glass and it is found that there is an explosion around the white point. At the same time, the most obvious phenomenon is that there is a strong static electricity on the surface of the printing material during the printing process, and the first-line printing operation workers are often charged.
In the case of such problems, it is necessary to add a static elimination device to the printing machine, such as an electrostatic copper wire or an ion wind static elimination device. For unprinted printing companies, a humidifier can be placed next to the machine to increase the local ambient humidity and also provide good static removal.
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