Application of pollution-free ultraviolet ink in flexographic printing

UV ink has developed rapidly in the past 10 years and has entered a mature stage, and is recognized as a pollution-free ink variety in the world. At the 7th Asian International Conference on Radiation Curing held in Malaysia last August, a lot of information indicated that the world ’s most important application area for radiation curing (including EB curing and UV curing) materials is the printing industry. Its main varieties include: UV varnish, UV screen printing ink, UV offset printing ink, UV flexo printing ink, UV metal printing ink and UV electronic circuit ink, etc. According to information, the UV flexo ink consumed in the United States reached 3,000 tons in 1997, and is increasing at a rate of 9-12% per year.

In recent years, the development of domestic UV materials for printing has also been relatively fast. According to statistics, the domestic consumption of UV printing materials in 1998 has exceeded 2,000 tons (including domestic and imported materials), which are mainly used for UV glazing and printed circuit board inks. In addition to UV screen printing inks, there are also some UV offset printing inks, UV relief printing inks, etc. UV flexo printing inks are used in very small amounts and are still in their infancy.

UV flexo ink is generally valued and favored abroad, mainly because it has the following characteristics:

1. UV flexo printing ink is safe and reliable, free of solvent discharge, non-flammable, and non-polluting to the environment. It is suitable for packaging and printing products with high hygienic requirements such as food, beverages, tobacco, alcohol and medicine. Flexographic UV ink has been used in foreign food packaging for many years without any problems.

2. UV flexo ink has good printability and high printing quality. The printing process does not change physical properties, non-volatile solvents, viscosity is stable, and it is not easy to paste and stack. It can be printed with higher viscosity, strong inking power, high dot definition, and tone reproduction Good performance, bright and bright ink color, firm adhesion, suitable for printing fine products.

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

4. UV flexo 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 of changing from a linear structure to a network structure, so it has many excellent physical and chemical properties such as water resistance, alcohol resistance, wine resistance, wear resistance, aging resistance, etc., which are other This type of ink is unmatched.

5. The amount of UV flexo ink is saved. Because there is no solvent volatilization, the effective ingredient is high, it can be converted into ink film by nearly 100%, and its dosage is less than half of that of ink or solvent ink, and it can greatly reduce the cleaning times of printing plate and anilox roller, so the overall cost is relatively low. Based on the above characteristics, UV flexo ink has obvious advantages and development prospects from the perspective of environmental protection, quality, and technological development.

From now on, the promotion and application of UV flexo technology in China still has a process. On the one hand, it is a further understanding and understanding of the UV flexo printing technology; on the other hand, it needs to be collaboratively improved and perfected in terms of equipment, light sources, supporting equipment, and process technology. The following comprehensive domestic and foreign information discusses some issues that should be noted in the application of UV flexo technology.

1. UV light source: Each color group of UV flexo printing needs to be equipped with an ultraviolet light source. Different colors of UV flexo inks have different abilities to absorb ultraviolet rays. For example, yellow and magenta have low absorption capacities and are easy to cure and dry, while blue and black have strong ultraviolet absorption capabilities and are less likely to dry. The power of the UV lamp can be distributed according to different colors to ensure the reasonable drying of the UV inks of various colors, while also saving energy. Pay attention to the aging of the UV light source and replace the UV lamp in time to prevent incomplete curing and cause adhesion. The life span of an ultraviolet lamp is generally 1000 hours. Frequent startup will significantly shorten the lamp life. [next]

2. Anilox roller: When using UV flexo ink, the mesh angle of the anilox roller is preferably 30 ° or 60 °. The following are some commonly used specifications of ceramic anilox roller.

2O0 line 9.5-11.0 BCM anilox roller: can print opaque solid patterns.

360 line 4.5-6.5 BCM anilox roller: can print solid and line patterns.

550 lines 3. OBCM anilox roller: can print continuous image adjustment products.

650 line 2.5BCM anilox roller: can be used to print continuous image products.

800 line 2.0BCM anilox roller: can print fine continuous image adjustment products.

3. Rubber roller: The rubber roller must be able to resist UV ink. The rubber rollers commonly used are generally made of EPDM rubber (EPDM) or silicone rubber.

Fourth, the plate: Although the flexographic photosensitive plates currently used can basically be used for UV flexo inks, it is best to choose a plate with better UV resistance, such as DuPont's UVP-67 open plate Wait.

V. Ink viscosity The use viscosity of UV flexo ink is slightly larger than that of water-based ink or solvent-based flexo ink, and the range is relatively wide. It can be in the range of 200-1000 CPS, and the general viscosity is 30O-500 CPS.

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

7. Auxiliaries: There are mainly three types of additives commonly used in UV flexo printing inks: 1. UV active thinner; 2. UV curing accelerator; 3. UV ink cleaning agent.

8. Safety protection: At present, there are two main precautions. One is the harm of ultraviolet radiation 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 the ventilation and discharge treatment. The latter should be operated with gloves to prevent the UV ink from directly contacting the skin. If the UV ink splashes on the skin, dry wipe first and then use soap immediately Wash with water.

UV flexo ink and its process technology are still being continuously improved, and new varieties and new equipment are constantly emerging. All of these will promote the perfection of UV case printing technology.

At present, the number of flexo printing machines with UV ink curing systems installed abroad is increasing, and the existing flexo printing machines are also constantly refitting UV ink curing systems. It has become a development trend to replace water-based inks and solvent-based inks with UV flexo inks, and it has been widely used on wide-width and narrow-width flexo printing machines. Undoubtedly, the development prospect of UV flexo technology is very promising. The promotion and application of domestic UV flexo technology needs to be based on our national conditions and product needs, as well as the matching of domestic equipment and equipment. With the increasingly strict environmental protection requirements and quality requirements, I believe that in the near future, domestic UV flexo technology There will certainly be a larger development.

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