Aluminium Tailgate,Aluminum Alloy Tail Lift,Electric Tailgate Lift,Aluminum Alloy Tail Gate Lift GUANGDONG NIULI LOGISTICS MACHINERY TECHNOLOGY CO.,LTD. , https://www.gdniulilogistics.com
The basic composition of the UV ink is: prepolymer, reactive diluent, photoinitiator, pigment, auxiliary, and the like. The prepolymer includes: epoxy acrylate, polyester acrylate, urethane acrylate, modified acrylate, and the like. The reactive diluent has the function of adjusting the viscosity of the system, the speed of the fixed line, and the performance of the ink film after the fixed line. It is divided into polyfunctionality and monofunctionality. The principle of UV ink curing is that the photoinitiator absorbs radiation to form a radical, initiates a cross-linking reaction between the prepolymer and the reactive diluent, and forms a polymer having a network structure, thereby rapidly turning the liquid into a solid. At present, the source of UV ink is generally a high-pressure mercury lamp, and its strongest wavelength is 365 nm. The application structure of many years shows that UV curing technology is an efficient, energy-saving, economical, wide-applicability and environment-friendly technology. But there are also some shortcomings: 1. The life of UV mercury lamps is limited. 2. The energy consumption of the UV mercury lamp is relatively large, and the energy used effectively is not high. Only about 20 of the input energy generates ultraviolet light, and 20 of the visible energy 40 is heat, which is not suitable for the heat sensitive material. 3. Although the UV mercury lamp has no VOC emissions for solvent-based inks, it is environmentally friendly and environmentally friendly. But there are also some hidden pollution. For example, the high pressure, high temperature and strong radiation of a mercury lamp can easily cause a chemical reaction of surrounding oxygen molecules to generate ozone. Ozone not only has an adverse effect on the atmosphere, but also has a greater impact on health. Relatively speaking, the LEDUV light source has the following advantages: 1. The cold light source has no heat radiation, and the surface temperature of the illuminated article is low. Such a characteristic does not deform the film in the process of exposing the liquid photosensitive solder ink, which reduces the distortion of the image transfer, and can better ensure the consistency of the image and the image. It can solve the long-term thermal damage problem in optical communication liquid crystal production, and is especially suitable for applications where liquid crystal edge sealing, film printing, etc. require small temperature rise. The calorific value is small, which can solve the problem that the mercury lamp printing equipment generates a large amount of heat and is unbearable to the staff, and the LED light source emits high-purity single-band ultraviolet light, and there is almost no infrared output, which is a cold light source, and the processed parts are not caused by Deformed by heat. 2. High efficiency. The LED light energy is highly concentrated in an ultraviolet spectrum segment with effective curing effect, and the actual effect is similar to that of a conventional high-pressure mercury lamp UV light source having a light intensity of 1000-2000 mw/cm. Thereby the curing time is shortened. Traditional mercury light looks very bright, but the heat is very high, because its spectrum is very wide, the UV spectrum that really plays an effective role only accounts for a part of the energy, a considerable part is lost in the visible light and infrared. Spectral (causing heat generation) is severely damaging to the eye of the operation and tends to thermally deform the machined workpiece. 3, long life. The service life of LED lamps is more than 10 times that of conventional mercury lamps, and the service life is not affected by the number of switches. 4. The reaction (switching) time is fast. LED lights do not need to be preheated, they can be printed immediately after turning on, and productivity is improved. 5. High security. LED lamps do not have UVC rays and are not easily damaged without ozone release. 6, high stability. The printing quality of UV inkjet printers has a lot to do with the process of UV drying. The stability of LED lamps makes the output energy predictable and stable, so the printing effect is also predictable and stable. The LED allows the ink to be cured deeper. The LED light emits light at a wavelength of 395 nm, which allows the ink to be cured deeper, so that the printed surface does not dry but the underlying layer does not dry. Printing on a variety of media has a strong adhesion and scratch resistance. 7. Low energy consumption. The power of LED lamps is extremely low, which is only equivalent to 10-20 of UV mercury lamps. Between the advantages of LED curing light sources, the development of LED curing inks has become the research and development direction of the UV ink industry. To develop LED curing inks, the first consideration is the compatibility with photoinitiators. One factor that must be considered when selecting photoinitiators is that the absorption spectrum of the photoinitiator matches the emission spectrum of the source. The second consideration is the compatibility with the pigment. The light-emitting wavelength of the LED is such that a substance such as a pigment contained in the UV ink overlaps with the absorption wavelength of the photoinitiator, so that the curing property is extremely inferior to that of a transparent varnish or the like which does not contain a pigment. The LED curing type must use a pigment having a good penetrability (small absorption) for the specific UV light wavelength used as compared with the conventional UV ink. In addition, the choice of prepolymer and reactive monomer is also important. At present, LED curing devices are gradually coming to the market, so LEDUV curing inks will gradually replace traditional UV curing inks. R & D and improvement of LED curing ink will be the focus of future research and development. After years of research and development, the company has developed LED offset UV ink series and screen LEDUV ink series. It has responded well to domestic and international markets.