Talking about the Application of Ultraviolet Ray in Soft Groove Printing

UV is the abbreviation of Ultraviolet Rays in English, which is ultraviolet light. Ultraviolet (UV) is invisible light, visible electromagnetic radiation other than violet light, and the wavelength is in the range of 10 to 400 nm. It is usually finely divided according to its nature. Section: a Vacuum UV, wavelength 10-200nm Note: nm is nanometer

b Short-wave ultraviolet (UV-C) wavelengths of 200-290 nm Sterilization

c Ultraviolet B (UV-B) at a wavelength of 290--320 nm d Long-wave ultraviolet (UV-A) at a wavelength of 320--400 nm

e Visible light, with a wavelength of 400--760nm. Ultraviolet (UV) is used in industrial production. Internationally, long-wave UV (UV-A) is commonly used.

Spectral segment diagram text

What is "nano"?

"Nano" is the English translation of namometer (abbreviation: nm) and is a unit of measurement. One nanometer is one millionth of a millimeter, which is also one billionth of a meter. It is equivalent to the length of 45 atoms strung together. .

1, the spectral range

Mercury Lamp Spectrogram Xenon Spectrograph Iron Spectra

Second, the appearance of the lamp:

1 UV lamps need matching matching transformers, capacitors, ballasts, triggers and other related power sources can be lit (1KW, ​​2KW supporting town, touch; 2KW supporting transformers, capacitors). (2) The ultraviolet ray needs to be equipped with a reflector. The function of the reflector is to collect light on the ultraviolet high-pressure mercury lamp. The UV light emitted by the UV lamp is reflected to the surface of the product to be cured, mainly in a line or a point. Position; and role in the exposure exposure lamp is astigmatism, the purpose is to evenly within a range of UV light, you can even plate, of course, different power platen area is different.

3 lamp power density = lamp power / lamp pole power density and the size of the UV coating, such as: 80w/cm 120w/cm 240w/cm

After the UV coating is irradiated with ultraviolet light, the photoinitiator is initiated to generate a ionic group or ion. These free radicals or ions react with the double bonds in the prepolymer or the unsaturated monomer to form a monomer gene, thereby causing Polymerization, cross-linking, and grafting reactions convert resins (UV coatings, inks, adhesives, etc.) from liquid to solid within seconds (unequal). (This process is called "UV curing"). A complete curing process is over.

UV flexo requires a UV light source for each color group. Different colors of UV flexo inks have different UV absorption capabilities. For example, yellow and magenta have low absorption capacity, they are easy to cure and dry, and blue and black have strong UV absorption ability and are less likely to dry. The power of UV lamps can be assigned according to different colors to ensure proper drying of various colors of UV inks, and also to save energy. Pay attention to the aging of the UV light source and replace the UV lamp in time to prevent incomplete curing and adhesion. UV lamps have a typical lifetime of 1000 hours. Frequent startup will significantly reduce lamp life.

The main purpose of today's lampshade for soft-groove printing is not only focusing, but it also provides the function of the shutter and can be controlled online. When the printer stops, the shutter closes and the lamp power drops. To the minimum maintenance state, to prevent the printed material from heat and fire, if it is a heat-sensitive material, it needs to be equipped with a quartz heat insulation sheet.

1. The entire UV curing device should be divided into two parts: light box and power control box

2. The appearance of the light box should be compact and complete, and ensure that the cooling wind can be convective.

3, the light source power is higher, the power can be fully work or 75% work can be converted.

4, fan switch in the electrical box control, and after turning off the lights to have 6-8 minutes of delay air cooling, cooling the lamp.

5, the main switch is equipped with lights, and the main electrical devices must have protective measures.

6, the lampshade part of the matching quartz heat insulation sheet, used for curing the sensitive material.

At present, flexographic presses and web transfer machines equipped with UV ink curing systems have been increasing in foreign countries. At the same time, the existing adhesive-adhesive machines are constantly being converted into UV ink curing systems. Replacing water-based inks and solvent-based inks with UV inks has become a development trend and has been widely applied to soft-convex machines. There is no doubt that the development prospect of UV flexo printing technology is very good. The promotion and application of domestic UV flexo technology needs to be based on our national conditions and the needs of products, as well as the perfection of domestic equipment and equipment. With the increasingly stringent environmental protection requirements and quality requirements, it is believed that in the near future, domestic UV device technology will also There must be a big development.