At present, the commonly used UV LED curing light sources are mainly concentrated in the wavelength range of 365nm and 395nm, which are also known as the UV LED short wave band and long wave band in the field of UV light curing.
The UVLED short wave band (365nm) is mainly used for UV glue and film surface curing. On the one hand, this is because the short wave penetration is weak and can be used for the surface of the substrate, but cannot achieve deep curing results,
The disadvantage is that insufficient short wave exposure can easily cause incomplete surface curing of the substrate
The UVLED long wave band (395nm) is concentrated in the deep curing inside the ink printing or coating, with stronger penetrability. It can penetrate through the surface of the ink coating and enter the interior to complete the deep curing of the ink
The disadvantage is that insufficient long wave energy can lead to weak adhesion of ink.
Range and application areas of various bands of UVLED
UVA [wavelength range 320-420nm]: It is commonly used in the form of LED beads and is mainly used for UV curing of coatings such as UV glue, film, ink, varnish, and paint
The commonly used frequency bands are concentrated at 365nm, 395nm, and 405nm
UVB [wavelength range 275-320nm]: mostly irradiated by UV lamps, mainly used to promote plant growth, with a peak at around 295nm;
UVC [band range 200-275nm]: mostly irradiated by UV lamps, mainly used in the sterilization and disinfection industry, with an ideal peak at around 250nm;
UVD [band range 100-200nm]: This band of ultraviolet light source is prone to react with oxygen, producing ozone,
This is also the reason why many full band UV mercury lamp workshops have odors;
UVV [band range 420-500nm]: an extended band in the UV curing industry, belonging to the visible ultraviolet range. Long term exposure can also cause eye pain, and professional protective glasses should be worn.
Because this wavelength band is longer and less harmful to the human body, it is also used in many UV glue curing fields.
When choosing different UV LED curing machines, it is necessary to match the corresponding band size according to the characteristics of UV glue and UV ink in order to achieve the best curing effect
