DVD Disk Printing Ink "Shrink" Outer Perspective (3)

In the field of CD and DVD printing, the basic application of white ink is very important. It is also the basic coating of waterless offset printing. So we used 140/34 mesh to test different formulations of white oil between the two layers. Using improved white ink in screen printing, we can see that the printed discs do not meet the specifications soon after the climate test.

Here we can explain the result after shrinking: The basic component of UV ink is acrylate. When it is under a UV lamp, the basic photochemical reaction takes place and the monomers and oligomeric polymers bind to each other. This reaction creates a network, which is why we call UV curing the reason for net formation. Depending on the raw materials used, the network becomes more compact or looser, and if the network density is high, shrinkage occurs.

In general, the shrinkage of the film will reduce the stickiness. When plastic printing causes problems, this parameter is very obvious. Of course, if the ink is not adhesive, the disc will not be deformed and there will be no problem with the tilt angle. However, when printing white inks, we obtained stickiness by using aggressive monomers. The adhesion of the ink plus high shrinkage can lead to very significant radiation deviations. After the climate test, the results are obvious. We will elaborate on this point in this article.

The next example is a white ink with good adhesion and low shrinkage. Before the climate test, the results of radiation and tangential deviations were very good. If you do not have to consider the climatic conditions mentioned in the DVD manual, then this white ink is very suitable for DVD printing.

However, after the climate test, the problem occurred. The deviation of radiation and tangency is very bad. The DVD looks like a Chinese hat. So this is a new consideration. When it comes to DVD inks, adhesion and low shrinkage are not the only parameters to consider.

We can explain the humidity inhalation results. Some formulations in the climate test may absorb water vapor. The expansion of the diaphragm can cause deformation of the disk. In some very bad cases, some air bubbles will be seen on the surface of the diaphragm, the adhesion will be lost, and the diaphragm will also peel off.

DVD Ink New Formula and Measurement of Printing Effects

We study with new parameters and develop new DVD ink formulations that have the following characteristics:

- Good adhesion properties on PC

- Low shrinkage

- Does not absorb moisture

See Figure 6 and Figure 7 for the results of the new formulation before and after the climate test.

This is a new area of ​​research, but recently we have also measured the effect of printing on the tilt angle.

For example, if only half of the CD is printed, we can observe that the tangent deviation is affected, but when printing with the new formula ink, the printed CD will meet the specifications and will not cause problems.

In this research process, we declared that the printing effect in DVD printing is a very important parameter that should be considered. The best way to obtain high-quality finished discs is to use special recipes to minimize the effects of tilt angles.

This kind of research is very important for the DVD industry, and we also realize that this kind of research is also very critical for other areas of the optical disc industry.




Source: CD production network