What are the characteristics of the silk screen printing ink of the packaging box

The current screen printing machine is very different from the previous printing machine. The most important point is the screen printing screen, which has the text or pattern to be printed on it. For screen printing, it is mainly composed of five basic elements: screen printing screen, printing squeegee, ink, screen printing machine and other consumables.

However, for the working principle of the screen printing machine, that is, the part of the text or pattern on the screen printing screen can penetrate the ink, and to print on the principle of the ink-tight substrate without the part of the mesh, we can understand it as There are many small holes on a piece of fishing net, and then we use cloth to seal up the excess holes.

Only the hole we want is left, and then the hole is continuously reduced and reduced until it is as small as the screen mesh, so that the ink can pass through the place without holes, and the place without holes cannot pass, so that It's easier to understand.

What is the viscosity of the ink? During the screen printing, we need to pour the adjusted ink on one side, and then use the screen printing to scrape the ink part on the screen printing plate, and then apply pressure while facing the other side of the screen printing screen. to move. During the movement of the ink, if it is squeezed by the squeegee from the place of the picture and text to the substrate.

In this way, the viscous effect of the ink will make the mark fixed within a certain range, and the squeegee will always be in line contact with the screen printing plate and the substrate during the printing process, and the contact line will move with the movement of the squeegee. A certain gap is maintained between the printing plate and the substrate, so that the screen printing plate during printing generates a reaction force on the squeegee through its own tension, and this reaction force is called rebound force.

And because of the rebound force, there will be a moving line contact between the screen printing plate and the substrate, but the other parts of the screen printing plate and the substrate are in a disengaged state. The ink and the screen are broken, which ensures the printing dimensional accuracy and avoids smudging the substrate.

When the scraper scrapes the entire layout and lifts up, the screen printing plate also lifts up and gently scrapes the ink back to the original position. So far it is a printing trip. Then remove the printed product and change it to another product to print.

Finally, I want to focus on the screen printing ink. Screen printing ink is actually printed by screen, and the ink is thicker. It not only has self-drying ink, but also infrared curing ink and ultraviolet curing ink. Because the printed ink is thicker, the curing time is longer.

The characteristics of the packaging screen printing ink are introduced as follows:

1. Thickness of ink layer

The silk screen printing ink has bright colors, giving people a very full feeling, strong three-dimensional sense, suitable for large-area field, text and other patterns. Disadvantages: The ink consumption is large, about 3 times thicker than offset printing, the light curing speed is slow, the ink film shrinks more obviously, and it is easy to cause the shrinkage or even bending of the disc, resulting in quality problems.

2. Low precision

The screen printing ink is limited by the screen printing process and raw materials. The screen printing image accuracy is 80-120 lines/inch, and the reproduction range of the dot tone is generally 10%-85%, so the fineness and layering of the product are not enough.

3. Small printing pressure

Screen printing is soft and elastic, with small printing pressure, which has little impact on the content of the disc, which is beneficial to protect the disc.