What is ultraviolet (UV) curing technology? What is a UV-LED?

- Jun 26, 2019-

What is ultraviolet (UV) curing technology? What is a UV-LED?


Concept:


A process in which ultraviolet (UV) is used to illuminate a liquid "UV-irradiated hardenable material" to harden it, which we call "UV Curing Process". Industrial UV wavelengths range from 200 nm to 400 nm.


UV Curing or UV Coating is a photochemical reaction.


UV curing is similar to the conventional drying process, but the principle is different. Conventional drying generally forms a hardening by evaporation of a solvent in the coating material, while UV curing cross-linking has no solvent evaporation.


UV curing is a type of radiation curing. Radiation curing is the use of electromagnetic radiation (such as ultraviolet UV or electron beam EB irradiation coating) to produce radiation polymerization, radiation crosslinking and other reactions. The chemical process of rapidly converting low molecular weight substances into high molecular weight products. The system contains no solvent or a very small amount of solvent. After irradiation, the liquid film is almost 100% solidified, so VOC (volatile organic compound) emissions are very low. Therefore, since the late 1960s, this technology has developed rapidly in the world, and its products have been widely used in many industries.

 

UV curing light source


Mercury lamps: UV curing machines have been used for a long time in the mainstream of mercury light sources. The principle of a mercury lamp is that the mercury in the voltage-activated lamp becomes a mercury gas that emits ultraviolet light, visible light, and infrared light. Due to the rapid decay of mercury, short life, high power consumption, high cost of use, high temperature, large volume, and mercury-containing defects, the industry has been striving to improve, but the limitations of original hardware have been difficult to break through.


What is a UV-LED?


UV-LED (UV Light Emitting Diode) is a solid-state semiconductor device that can directly convert electrical energy into ultraviolet light. UV-LED light source operating temperature is usually below 100 °C, with long service life, high reliability, high luminous efficiency, low power consumption, no heat radiation, environmental protection and other characteristics. In recent years, UV curing has gradually gained application.


UV-LED features:


1. Long service life


2. Significant energy saving effect


3. No heat radiation


4. Small size


5. The main peak is narrow, single, and concentrated


6.UV-LED operating temperature is low


7. Instant light


8. Environmental protection