As labels are printed faster and thinner, the advantage of UV LED technology is that it does not generate too much heat and thus does not damage thin labels and heat-sensitive substrate materials.
The energy required to light the LED array (which has many leds in one unit) is significantly lower than the energy required to light the U V lamp.
Because of this difference, UV leds need to be placed fairly close to the substrate material, 5 ~ 10 mm away from the substrate material, the furthest is only 25 mm.
The UV lamp USES a reflector to focus into a single beam about 53 mm away from the substrate. An LED is a floodlight that glows in all directions. The farther away it is from the substrate, the less light it gets on the substrate.
"
Compared with traditional UV lamp, UV LED has two advantages:
The first advantage is that LED lights can be switched on and off for a few microseconds as the label passes under the beam. It can also flicker, open when needed, close when not needed, save energy and cost.
The second advantage is that the curing speed can be increased to 150 m/min.
Phoseon, founded in 2002, specializes in the production of UV LED lamps. LED is only part of Phoseon's products, accounting for 10 percent of the company's entire business.
It has the ability to make leds, which are installed in the system to keep cool to increase their power at any time. The LED array is encapsulated in a system with printed circuit boards and cooling units that can be either air-cooled or water-cooled.
Technically, UV curable inks are solid rather than liquid after curing, and the UV photoinitiator links with other particles in the mixture, causing polymerization to solidify, form a solid and "dry".
Conventional UV curing utilizes the entire UV spectrum of 200 to 450 nm, while UV leds concentrate in a narrow range of UV spectrum, usually 395 to 405 nm. At present, some UV ink curing at 365 nm (mainly in the range of uv-a), but most of the concentrated around 395 nm, which is the best point for curing.