Types of Equipment and Materials Applied to UV Printing (II)

Since the UV lamp emits IR (infrared wave) when it emits UV electromagnetic waves, the UV equipment will operate at a high temperature (for example, the temperature of the quartz lamp can reach 600~800°C), which will not only shorten the life of the equipment However, the importance of the cooling device is evident in the fact that prints are also prone to stretching.

3. Ink supply system

Since UV inks have higher viscosity, higher friction, and damage to the components of the printing press (including blankets, ink rollers, etc.) than conventional lithographic inks, the ink in the ink tank should be treated in addition to printing. Should continue to be stirred, the ink roller and blanket used in the ink supply system should be designed for UV printing. In order to maintain the stability of the UV ink, so as not to affect the viscosity of the ink, the temperature control device of the ink roller is also an important device.

4. Heat dissipation and exhaust device

The main function is to remove excessive heat from the inside of the machine and eliminate the ozone generated when the ink cures and polymerizes. Usually consists of an exhaust motor and an exhaust pipe.

5. Printing ink

Whether the quality of the ink is good or not is the most critical factor that directly affects the UV printing. In addition to affecting the traditional quality factors such as color performance and color gamut, the printability of printing ink directly affects the adhesion, strength, and anti-friction force of printed materials after printing is completed. Photoinitators and polymer monomers and their properties are key basic materials.

To control the adhesion of the UV ink, when the wet UV ink is in contact with the object to be printed, the surface tension of the object to be printed (unit: dynes/cm) must be higher than the surface tension of the ink (Schilstra, 1997) to produce Good ink adhesion, so controlling the surface tension of the ink and the printed material is an important technology for UV printing.

6.UV energy measuring equipment

In UV printing, because the UV lamp aging, power supply, printer speed and other factors, need to control the UV energy to remain stable, so the measurement of UV energy technology has become a very important part.