Application of the most popular pollution-free UV

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The application of pollution-free UV ink in flexographic printing

UV ink is also called UV ink. It uses a certain wavelength of UV radiation to change the liquid UV ink into a solid ink through instantaneous photochemical reaction

uv ink has developed rapidly in recent 10 years, has entered a mature stage, and is recognized as a pollution-free ink in the world. At the 7th Asian radiation curing International Conference held in Malaysia last August, many information indicated that the printing industry is the most important application field of radiation curing (including EB curing and UV curing) materials in the world. Its main varieties include: UV glazing oil, UV silk printing ink, u purchased some inferior equipment V offset printing ink, UV flexo printing ink, UV metal printing ink and UV electronic circuit ink, etc. According to information, in 1997, the consumption of UV flexo printing ink in the United States has reached 3000 tons, and is increasing at a rate of% every year

in recent years, domestic UV printing materials have also developed rapidly. According to statistics, the consumption of domestic UV printing materials in 1998 has exceeded 2000 tons (including domestic and imported materials), which are mainly used for UV glazing, printed circuit board ink and UV silk screen printing ink. In addition, there are also some UV offset printing ink, UV embossing ink, etc. the use of UV flexo printing ink is very small and is still in its infancy

uv flexo printing ink is widely valued and favored in foreign countries, mainly because it has the following characteristics:

1.uv flexo printing ink is safe and reliable, solvent-free, non flammable and non polluting. It is suitable for packaging and printing materials with high sanitary requirements such as food, beverage, tobacco, alcohol and drugs. Flexographic UV ink has been used in the field of food packaging abroad for many years without any problems

2.uv flexo printing ink has good printing adaptability, high printing quality, no change in physical properties during printing, no volatile solvent, stable viscosity, and is not easy to paste and stack plates. It can be printed with high viscosity, strong inking force, high dot definition, good step reproducibility, bright ink color, firm adhesion, and is suitable for fine product printing

3.uv flexo printing ink can be instantly dried, with high production efficiency and wide application range. It has good adhesion on different printing carriers such as paper, aluminum foil and plastic. The products can be stacked immediately after printing without adhesion

4.uv flexo printing ink has excellent physical and chemical properties. The process of UV curing and drying is the photochemical reaction of UV ink, that is, the process from the initial structure of the line experimental machine to the shape structure. Therefore, it has many excellent physical and chemical properties, such as water resistance, alcohol resistance, alcohol resistance, wear resistance, aging resistance, etc., which are inferior to other types of ink

5.uv flexo printing ink consumption is reduced. Since there is no solvent volatilization and the active ingredients are high, it can be almost 100% converted into ink film. Its amount is less than half of that of water ink or solvent ink, and it can greatly reduce the cleaning times of printing plate and embossing roller, so the comprehensive cost is relatively low. Based on the above characteristics, UV flexo printing inks have obvious advantages and development prospects from the perspective of environmental protection, quality and technological development

promotion and application of UV flexo printing technology in China at present 1 There is still a process when the number of shoelace samples is not less than 5. On the one hand, it is to further understand the UV flexo printing technology, and on the other hand, it is also necessary to improve and perfect the equipment, light source, supporting equipment and process technology. The following comprehensive information at home and abroad talks about some problems that should be paid attention to in the application of UV flexo printing technology

I. UV light source: each color deck of UV flexo printing shall be equipped with UV light source. UV flexo printing inks of different colors have different ability to absorb ultraviolet rays. For example, yellow and magenta have low absorption ability and are easy to cure and dry, while blue and black have strong ability to absorb ultraviolet rays and are less easy to dry. The power of UV lamp can be distributed according to different colors, so as to ensure the reasonable drying of various UV inks and save energy at the same time. Pay attention to the aging of UV light source, and timely replace the UV lamp to prevent incomplete curing and adhesion. The general service life of the UV lamp is 1000 hours. Frequent startup will significantly shorten the service life of the lamp

II. Wrinkle roller: when using UV flexo printing ink, the eye angle of the ink transfer roller should preferably be 30 ° or 60 °. The following are several commonly used ceramic corrugated rollers

2o0 line 9.5-11.0bcm corrugated roller: can print opaque field patterns

360 line 4.5-6.5bcm corrugated roller: it can print field and line patterns

550 line cm wrinkle roller: it can print continuously adjustable image products

650 line 2.5bcm corrugated roller: it can print continuously adjustable image products

800 line 2.0bcm wrinkle roller: it can print fine continuously adjustable image products

III. rubber roller: the rubber roller must be able to resist UV ink. The commonly used rubber roller is generally made of EPDM rubber (EPDM rubber) or silicone rubber

IV. plates: Although the currently used flexo sensitive plates can basically be used for UV flexo printing inks, it is better to choose plates with good UV ink resistance, such as DuPont's uvp-67 open type plates

v. ink viscosity the use viscosity of UV flexo printing ink is slightly higher than that of water-based ink or solvent flexo printing ink, and the range is relatively wide. It can be in the range of 200 ~ 1000 CPS, and the general use viscosity is 30o-500 CPS

VI. storage: UV flexo printing ink shall be stored away from light and heat. The storage temperature shall be controlled at 5 ℃ -30 ℃, and the storage shelf life is generally half a year

VII. Additives: there are three commonly used additives for UV flexo printing inks: 1. UV active diluent; 2. UV curing accelerator; 3. UV ink cleaner

VIII. Safety protection: at present, there are two main points to prevent, one is the harm of UV radiation light source to human body, and the other is the harm of UV ink to human body. The former needs to use opaque materials to shield and seal the light source and strengthen ventilation and discharge treatment. The latter should be operated with gloves to prevent UV ink from directly contacting the skin. If UV ink splashes on the skin, it should be wiped dry first, and then cleaned immediately with soap and water

uv flexo printing ink and its technology are still being improved, and new varieties and equipment are emerging. All these will promote the UV case printing technology to be more perfect

at present, the number of flexo printing machines installed with UV ink curing system in foreign countries is increasing. At the same time, the existing flexo printing machines are also constantly refitting the UV ink curing system. It has become a development trend to replace water-based ink and solvent-based ink with UV flexo printing ink, which has been widely used in wide and narrow flexo printing machines. Undoubtedly, the development prospect of UV flexo printing technology is very bright. The promotion and application of domestic UV flexo printing technology needs to be based on our national conditions and product needs, as well as the improvement 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 flexo printing technology will also have a greater development

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