UV inkjet printing technology application (4)
In order to meet the requirements of the UV lamp device described above, the following design principles are very important. Lamp design Flat Brushes For Oil Painting And Acrylic Painting
Flat Brushes is good for Color Painting and Line Painting. It used a lot for Oil Painting and Acrylic Painting.These Brushes can make Bold, Sweeping Strokes or be on their edge for Painting for fine lines. The material of Flat Brushes can be Hog hair and Synthetic hair.
Types of brushes
There are so many many brushes:washes/glazes, rounds, flats, filberts and liners and more. Choosing the right type for the technique is important. Let`s look at the different types.
Flat Brushes
Flats are brushes with a straight chisel edge and square shaped filaments. These can be known as shades if they`re in smaller sizes and washes/glazes if in bigger sizes. Large areas are painted with a wash/glaze brush whereas smaller flats are used for small areas of painting
Round brushes
Round brushes have a large diameter of the ferrule, more so than a liner, which can be used for applying thick to thin lines, filling in odd shaped areas, painting details and work great for lettering. Liners don`t hold as much paint as a round, however, they are super great for creating lines or curves. Script liners are similar to liners but the filaments are much longer and hold more paint. A round brush tapers to a pointed tip – several types of rounds are referred to rounds, liners or script liners. Angle brushes are filaments that have been cut on an angle – these are excellent to use in small or curved areas of the painting.
Filberts
Brushes with oval shaped filaments are known as filberts in smaller sizes and oval wash in larger sizes. Both shapes can be used for base coating, stroke work and more. There are filbert combs, filbert wash and more.
Mop Brushes
Then there are mop brushes–great for blending and smoothing out small areas. They`re also ideal for applying powdered pigments–just dust them lightly over hot or tacky wax.
Specialty Brushes
Then there are all the speciality brushes on the market used for certain techniques and garner their own results–fan, deer-foot, stumbler, mops,stencil and more
Irradiation device
In order to achieve a UV illumination that is both compact and high-intensity, the light valve diameter and reflector design are important. When the same energy is input into the light valve, the finer the diameter, the higher the energy density per unit volume. As a result, the number of photons output per unit area per unit area increases, thereby increasing the illumination illuminance.
About 70% of the UV-irradiated energy received by the substrate is obtained via a reflector. For this reason, the shape of the reflector and the UV reflection coefficient become important factors. In order to obtain high-intensity UV illumination, the shape of the reflector is preferably elliptical. It is important to place the lighted lamp valve at one focus of the ellipse and the irradiated substrate should be placed at another focus of the ellipse.
Furthermore, the reflection efficiency of the reflector is also related to the surface finish of the reflector, and the illuminance efficiency of the spectral band required for curing will change, so it is also very important. When it is desired to suppress the influence of the thermal energy to the irradiated substrate, a dichroic-reflective reflector that absorbs from the long wavelength region to the infrared region but reflects only the ultraviolet region should be used.
Since 70% of the UV energy reaches the substrate via the reflector, once the surface of the reflector is covered with dust and the like, illumination illumination decreases, so the key design is to ensure that the reflector is clean.
Luminescence spectrum and stability
UV light lamp valve has a variety of characteristics of the light band, so it is necessary to choose the best light valve for UV curing ink.
The UV curing lamp device is divided into an electrode lamp device that applies a high voltage to a filament of a light emitting lamp valve to make it emit light, and an electrodeless lamp device that does not have a filament in a light emitting lamp valve and emits light by absorbing microwaves. Lights. The experiment proved that the electrodeless lamp has stable output and spectrum because it has no filament.
Power device
The use of solid-state switch engine technology constitutes a high-voltage circuit power supply device, its power supply parts not only to achieve a compact, lightweight, power saving, but also to achieve a stable light output and variable adjustment, and then in a short time to complete the lamp ON/OFF control, so there is no need to set the shutter. According to this, in addition to curing the ink, it is possible to suppress the influence of the lamp on the inkjet printing mechanism. Figure 6 shows the ON/OFF output characteristics. 
With fixed print heads or mobile print heads, the UV lamp design requirements are different. In the case of a fixed print head, it is possible to further compact the used UV lamp fixture and increase the illuminance output.
Figure 7 (see next page) is a lamp unit that was recently developed by Fusion UV and mounted on a mobile printhead printer. The lamp device is an electrodeless lamp with a luminous valve length of 1 inch. The microwave source is not at the light source but at the power source. Therefore, the size of the light source is only 8.6 x 8.6 x 4.6 cm. It is very compact, weighs only 200g, and has an illuminance of 1200mW/cm2. 
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