Slightly talk about inkjet CTS system
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Since the contact screen printing, the screen printing process and the film have been inseparable. In short, the process is to put a film that has been prepared according to the requirements of screen printing on a screen that has been coated with a photosensitive adhesive and has been dried, and is exposed to ultraviolet light by using a plate. If the light is not hardened, it can be washed off with water. After the exposure is completed, the water is printed, which shows the graphic to be printed, and a screen version is ready.
This set of procedures has been used for many years, suddenly broke into several English letters, what CTP, CTS, for a while, but a little bit of analysis, the principle is not difficult to understand.
Basic principles of CTS
In recent years, the CTP in the field of offset printing can be described as infinite, and the new technology without direct film-making has brought a digital revolution to the printing industry. In fact, in the world of screen printing. In foreign countries, the direct plate-making technology in screen printing is called CTS, which is Computer To Screen.
The creation of this new technology relies on the development of inkjet printers, which have been developed by porting inkjet printing technology to screen printing. The working principle is as follows: the screen is coated with the photosensitive glue and dried, and the light-blocking ink is printed on the photosensitive layer through the inkjet system, and after the ink is dried, the screen is fully exposed by ultraviolet light, and the place where the ink is not sprayed is seen. Photohardening, the landlord resistant to ink spray can be washed away. After the exposure is completed, the ink-sprayed landlord is rinsed off with a developing solution (usually water) to form a graphic portion of the screen plate. In contrast to the plate making process described in the opening paragraph, it is easy to see what the effect of the film is and the way of inkjet is replaced.
Inkjet system classification
According to the principle of inkjet, inkjet imaging systems are classified into a heated thermal ink system and a piezoelectric inkjet system.
The former has a heating device inside the nozzle, and the temperature inside the nozzle rises when heated, and a gas is formed, and under the bubble pressure, an ink droplet is formed, and the ink droplet is ejected out of the nozzle, and a new ink droplet is replenished. As for the switch of the heating device, it is controlled by the computer according to the desired pattern. The nozzles are arranged in a row or arranged in a matrix, and the entire screen is produced by moving.
As for the latter, the heating device in the nozzle is replaced by a piezoelectric crystal, and when a current passes, the crystal is deformed, and a pressure is generated to press the ink droplet out. When the current is passed is also controlled by the computer according to the desired pattern.
In comparison, the heated inkjet system produces ink splattering when printing, resulting in fine ink droplets at the edges of the image, affecting the quality of the screen. Moreover, such a device has a requirement for the viscosity of the ink, and only water-based ink can be used. The piezoelectric inkjet system does not produce ink splashing, and there is no requirement for the exact adhesion of the ink. Wax inks are generally used, which are ejected from the nozzles in a semi-cured state and dried immediately on the screen. This is the waxing system that some people say.
Precautions
1. Just as we will pay attention to the light blocking property of the film before, in the CTS system, we must pay attention to the light blocking property of the printing ink. Usually we require an ink layer density greater than 3.0.
2. The resolution of an inkjet imaging system is not too high, generally only 600~720dpi. This is because the higher resolution causes the dots to be too small, thereby reducing the blocking power of the ultraviolet rays.
3. The nozzle may be clogged, and the ink may not be sprayed. Pay attention to the cleaning of the nozzle. There are also some CTS systems that can be set to turn off the printheads that cannot be inkjet.
4. The computer directly makes plates, and once it is made, it will be re-plated, which is much larger than the previous ones. Therefore, the proofing is not only indispensable, but also must be fine and fine.
CTS direct plate making features
1. Reduces the plate making process and saves time.
2. Get rid of the film, the printing information is easy to save and easy to modify. It avoids the crease caused by the improper placement of the film, its trace and the size change.
3. Digitized screen positioning during multi-version overprinting reduces human error.
4. There is no requirement for the mesh size, and there is no special requirement for the mesh frame. The photosensitive adhesive does not need a special photosensitive adhesive. There are also no special darkroom requirements.
5. It can save printing information with customers through the network, saving time and effort.
6. The dot shape and dot size can be set.
In view of the CTS system and its many advantages, it is bound to open up a broader market for screen printing. Especially in large-format screen printing, the digitization of the CTS system minimizes many artificial errors, and its role is self-evident.