High-speed UV LED Ink is the most important fact affect your printing quality and efficiency. Well-formulated inks ensure continued print quality, system uptime reliability, and high productivity without user intervention.
Compared with traditional UV ink, UV LED inks only active for typical wavelength. Because of special consideration of photoinitiators and pigments
in the ink formulation, which only matches the spectral output of
the LED lamps. These special photoinitiators absorb at a higher
wavelength as opposed to traditional photoinitiators and are
typically more expensive. The spectral output of a LED lamp to
cure UV LED inks is very narrow, 365 – 405 nm, as compared to
a UV mercury system which operates from 200 – 700 nm range.
Because of the limited spectral wavelength, UV LED primarily
operates in the UV-A zone and considered to be ‘safe’ because
it is closest to visible light. However, prolonged exposure to
this energy can be dangerous. The UV-B and much of the
UV-C spectrums of light are primarily used for germicidal and
sterilization purposes. The light produced at these wavelengths are
not only harmful to microorganisms but are also dangerous to
humans and other forms of life that may come in contact with it.
These lamps should always be shielded and never viewable to
the naked eye, even though it may appear that little or no light is
emanating from the device. Exposure to these wavelengths may
cause skin cancer and temporary or permanent vision loss or
How does high-speed UV LED ink work?
Compared with traditional UV lamp, UV LED lamp only active on typical wavelength. However, it doesn’t mean UV LED ink need less UV energy for curing. You can see from the following picture of our UV LED Ink testing report, good DOSIS energy will help for improving curing speed and quality. Therefore, we have confidence that even use the same UV LED ink, DPL high power UV LED curing system can cure faster and better.
UV LED curing technology is more and more popular in industry developing. Because UV LED curing technology offers many benefits over traditional broad-spectrum UV light curing.
What is UV LED Curing Technology?
Compared with traditional UV lamp, UV LED lamp provides typical wavelength light to reach our requirement. For example, when we turn on a UV lamp, the light will cover wavelength from 100 to 410nm. But for UV LED lamp, we can choose which wavelength we want to have according to the different request by ink or coating lacquer.
What is the advantage of DPL UV LED curing system?
DPL Customer Designed UV LED module
DPL eAsycureTM LED curing system use our own design LED Modules with wider curing area (41x60mm per unit) and high-resolution optical lens, which can provide high curing energy up to 26w/cm2
Individual Power for each LED Module
Each LED module has one LED driver with stable voltage and adjustable electric current, which provide high uniformity energy output up to 98%. Independent driver unit also increases LED module’s working lifetime and decrease LED energy damping.
DPL eAsycureTM UV LED curing system series is build up with length from 82mm to 2240mm. We also provide custom design service.
DPL eAsycureTM UV LED curing system includes one set of lamp house, one set of LED Driver, one set of PLC. Clients can use their own chiller or our recommend brands. To protect LED Modules’s working life, we request chiller should have flower sensor so chiller will be automatic switch on/off according to DPL temperature sensor in lamp house.
Long lifetime: >20.000h
With our highly effective water chilling construction, DPL LED curing system keep the low temperature even at power at 26w/cm2 . DPL cooling system optimizes the heat extraction from the LED chip, which provides surface printing temperature lower than 40oC. Low temperature also reduces wastage and rejects with heat sensitive substrates.
“Plug & Play” smart system:
DPL LED Curing system is a smart system with “plug &play” design, easy to operate and suitable to install in the existing machine
In modern industry, more and more people pay attention to how to produce “safe product” with the green process. For example, you can find more and more organic markets in our city. Back to our printing and coating industry, more and more people are thinking about how to reduce pollute, one of the good ways is using more green source instead of difficulty recycled material, such as in printing and coating process, use UV lamp as drying source instead of heating source, because UV light or LED light drying source can cure the ink in very short time.
Is your UV lamp safe? I believe that you have the experience when you walk into a UV printing production in China, or when you visit a printing machine exhibition, you can smell “Rotten egg”. That is Ozone smell.
The Environmental Protection Agency (EPA) warns that although ozone in the stratosphere protects us from harmful UV radiation, low-level ozone is dangerous. Infants, children, and those with respiratory problems may be in particular danger.
How UV lamp produce Ozone?
Before we try to solve this harmful ozone problem, we need to find out how UV lamp produces ozone. UV light includes different wavelength light from UVA to UVC. When UVC hits oxygen (O2) molecules, it produces ozone.
DPL UV Lamphouse uses a closed design house construction. Therefore after you close the house, UV light will not touch outside air.Also, there is only very low-density air inside lamphouse, very low-density ozone will be produced when you just close the lamphouse, which is proofed by Denmark and European Industry. It means that our client doesn’t need to install expensive “ozone exhaust” system, their worker can work in a clean “Ozone free ” production.
Super wider UV curing lamp means lamp provides curing width over 1700mm.
For graphics printing and coating business, more and more clients are looking for the more efficient printing process to reduce production cost. Therefore, our clients also need wider web printing or coating machine equipped with Super wider UV curing lamps. But super wider UV lamp is not only just wider. Compared with standard width UV lamp, super wider lamp need to consider more than the width.
DPL Pattern Lamphouse construction
DPL Super wide Cold UV curing lamp at 2000mm with specially coated reflector and our pattern design on lamp construction. For example, from the top to two side frame of lamphouse, there is UV radiation refect coating. When UV lamp is on, these coating layers will reflect light to the bottom quartz window. Quartz window has very high UV transmission, means more than 95% UV light will pass throw. In order to reduce production cost, there are many manufacturers use the cheap reflector or even don’t use specially coated UV reflector. But as you know, more than 60% light energy of UV lamp is IR. The problem of IR is to dry the solvent or water-based content inside of UV Ink or lacquer. The Result is the outside of ink is dry, but inside ink cannot be dried. Because the dried top side is too hard to go throw.
High-efficiency chilling channel
Inside of lamphouse, DPL high-efficiency chilling channel can cool down lamphouse frame by automatic controlled chilling water. The chilling control sensor can automatically increase or decrease water flow.
DPL Super wider curing Lamps are designed for super wide printing and coating machine. Lamp carry on DPL’s focus on cold curing temperature and uniformity, which is suitable for super wide touch screen or printed electrics process.
According to the different application, there are several types of UV Lamp. For example, we can see many UV lamps when we visit emergency or operating room in hospitals. They are UVC lamp, which uses for disinfecting. UVC means the light wavelength from 100-280nm. For graphics printing and coating industry, we use kinds of Gas-discharge UV lamps or UV LED lamp. Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas. For UV LED lamp, we will introduce later.
What is DPL cold UV curing system?
As you know, UV lamp output includes 60% IR energy, a normal metal reflector reflects IR energy out of the lamp head/house, and heat up the touch temperature between your base material and lamp head. Every DPL lamp head/house use specially coated reflectors from the top frame to the two sides frame. These reflectors can absorb 90% IR from your lamp and transfer to the chilling system. Therefore, the surface temperature of your printing material is the only 5-10C degree higher than your environment temp.
What is the advantage of Cold UV curing system?
Besides of which we mentioned before, reduce UV curing temperature can help improving printing quality. Cold UV curing temperature can also help improving UV lamp bulb ‘s working lifetime. By our pattern design lamphouse, the general lifetime of our UV lamp bulb is over 2000 to 3000hours. On the other way, the lower curing temperature is good for curing UV lacquer on the thermal sensitive material. For example, even for printing base film as PET film, lower curing temperature will help improving printing accuracy.