UV ink, also known as UV ink, is the use of ultraviolet radiation of a certain wavelength, through the instantaneous photochemical reaction, so that the liquid UV ink becomes a solid ink.
UV inks have developed rapidly in the recent 10 years and have entered the mature stage, and are recognized by the world as pollution-free ink varieties. At the 7th Asian Radiation Hardening International Conference held in Malaysia in August last year, a lot of information showed that the world's current application of radiation curing (including EB curing and UV curing) materials is the printing industry. Its main varieties include: UV Varnish, UV screen printing inks, UV offset printing inks, UV flexo printing inks, UV metal printing inks, and UV electronic circuit inks. According to information, the amount of UV flexo printing ink consumed in the United States in 1997 reached 3,000 tons, and it is also increasing at a rate of 9 to 12% per year.
In recent years, the development of domestic printing UV materials is also relatively fast. According to statistical data, in 1998, the domestic consumption of UV printing materials has exceeded 2,000 tons (including domestic and imported materials), which is mainly used for UV coating, printed circuit board ink And UV screen printing ink, in addition, there are some UV offset printing inks, UV embossing inks, etc., UV flexo printing ink usage is very small, is still in its infancy.
UV flexo printing inks are widely recognized and favored abroad because they have the following characteristics:
1. UV flexo printing ink is safe, reliable, solvent-free, non-flammable, and environmentally friendly. It is suitable for packaging and printing crystals that require high hygienic conditions such as food, beverages, tobacco and alcohol, and pharmaceuticals. Flexo-UV inks have been used in foreign food packaging for many years without any problems.
2. UV flexo printing inks have good printability, high printing quality, no change in physical properties during the printing process, no volatile solvent, stable viscosity, and are not easy to paste plate, can use higher viscosity printing, strong ink, high dot definition, reproduction of tone It is good in nature, bright and light in ink, and firmly attached, suitable for printing fine products.
3. UV flexo printing inks can be instantaneously dried, have high production efficiency and wide application range. They have good adhesion on different printing carriers such as paper, aluminum foil and plastics. Products can be stacked immediately after printing, and adhesion will not occur.
4. UV flexo ink has excellent physical and chemical properties. The process of UV curing and drying is the photochemical reaction of UV ink, ie, the process of changing from a linear structure to a network structure. Therefore, it has many excellent physical and chemical properties such as water resistance, alcohol resistance, alcohol resistance, abrasion resistance, and aging resistance. This type of ink is not as good as it is.
5. UV flexo ink consumption. Because there is no solvent volatilization, the active ingredient is high, nearly 100% can be converted into an ink film, the amount of which is less than half of the ink or solvent ink, and the cleaning times of the printing plate and the anilox roller can be greatly reduced, so the overall cost is relatively low. Based on the following characteristics, UV flexo inks have obvious advantages and development prospects from the perspective of environmental protection, quality, and technology development.
The promotion and application of UV flexo printing technology in the country has a process from the current point of view. On the one hand, it is a further understanding and understanding of UV flexo printing technology. On the other hand, it is necessary to improve and perfect the equipment, light sources, supporting equipment, and process technologies. The following comprehensive domestic and international information discusses some issues that should be noted in the application of UV flexo technology.
First, UV light source: UV flexo printing needs to be equipped with 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.
Second, the anilox roller: When using UV flexo ink, the anilox roller mesh angle is preferably 30 ° or 60 °. The following are several common specifications of ceramic anilox roller.
200 line 9.5-11. OBCM Anilox: Can print opaque solid patterns.
360 line 4.5-6.5 BCM Anilox: Printable field and line patterns.
550 line 3.0BCM Anilox: Printable continuously adjustable image product.
650 Line 2.5BCM Anilox Roller: Printable Continuously Adjustable Image Product
800 line 2.0BCM anilox roller: Printable fine continuous tone image product.
Third, the rubber roller: The roller must be able to resist UV ink, usually used rubber roller EPDM rubber (EPDM) or silicone rubber.
Fourth, the media: Although the current use of flexo printing plate can basically be used for UV flexo ink, but it is best to use UV ink resistance better plate, such as DuPont's UVP-67 open plate Wait.
V. Ink Viscosity UV flexo inks have a slightly higher viscosity than water-based inks or solvent-based flexographic inks, and they have a wide range, which can be in the range of 200-1000 CPS, with a typical viscosity of 300-500 cps.
Six, storage: UV flexo ink should be strictly avoid light, avoid heat storage. Storage temperature should be controlled at 5 °C -30 °C, storage shelf life is generally six months.
Seven, additives: UV flexo printing ink commonly used additives are mainly three kinds: 1. UV reactive diluent; 2. UV curing accelerator; 3. UV ink cleaner.
VIII. Security Protection: There are two main points for prevention. One is the harm of UV radiation to the human body and the other is the harm of UV ink to the human body. The former needs to use lightproof material to shield and seal the light source and strengthen the ventilation and discharge treatment. The latter should be operated with gloves to prevent UV ink from directly contacting the skin. For example, UV ink splashed on the skin should be dry rubbed and then used immediately. Wash with water.
UV flexo printing ink and its process technology are still continuously improving, new varieties and new equipment are emerging. All of these will promote more perfect UV flexo technology.
At present, flexographic presses equipped with a UV ink curing system are continuously increasing in foreign countries, and the existing flexographic presses are constantly being modified into UV ink curing systems. Replacing water-based inks and solvent-based inks with UV flexo inks has become a development trend, and has been widely applied to wide-width and narrow-width flexo printing 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, we believe that in the near future, domestic UV flexo technology There must also be a larger development. (Text / Zhu Meisheng)
UV inks have developed rapidly in the recent 10 years and have entered the mature stage, and are recognized by the world as pollution-free ink varieties. At the 7th Asian Radiation Hardening International Conference held in Malaysia in August last year, a lot of information showed that the world's current application of radiation curing (including EB curing and UV curing) materials is the printing industry. Its main varieties include: UV Varnish, UV screen printing inks, UV offset printing inks, UV flexo printing inks, UV metal printing inks, and UV electronic circuit inks. According to information, the amount of UV flexo printing ink consumed in the United States in 1997 reached 3,000 tons, and it is also increasing at a rate of 9 to 12% per year.
In recent years, the development of domestic printing UV materials is also relatively fast. According to statistical data, in 1998, the domestic consumption of UV printing materials has exceeded 2,000 tons (including domestic and imported materials), which is mainly used for UV coating, printed circuit board ink And UV screen printing ink, in addition, there are some UV offset printing inks, UV embossing inks, etc., UV flexo printing ink usage is very small, is still in its infancy.
UV flexo printing inks are widely recognized and favored abroad because they have the following characteristics:
1. UV flexo printing ink is safe, reliable, solvent-free, non-flammable, and environmentally friendly. It is suitable for packaging and printing crystals that require high hygienic conditions such as food, beverages, tobacco and alcohol, and pharmaceuticals. Flexo-UV inks have been used in foreign food packaging for many years without any problems.
2. UV flexo printing inks have good printability, high printing quality, no change in physical properties during the printing process, no volatile solvent, stable viscosity, and are not easy to paste plate, can use higher viscosity printing, strong ink, high dot definition, reproduction of tone It is good in nature, bright and light in ink, and firmly attached, suitable for printing fine products.
3. UV flexo printing inks can be instantaneously dried, have high production efficiency and wide application range. They have good adhesion on different printing carriers such as paper, aluminum foil and plastics. Products can be stacked immediately after printing, and adhesion will not occur.
4. UV flexo ink has excellent physical and chemical properties. The process of UV curing and drying is the photochemical reaction of UV ink, ie, the process of changing from a linear structure to a network structure. Therefore, it has many excellent physical and chemical properties such as water resistance, alcohol resistance, alcohol resistance, abrasion resistance, and aging resistance. This type of ink is not as good as it is.
5. UV flexo ink consumption. Because there is no solvent volatilization, the active ingredient is high, nearly 100% can be converted into an ink film, the amount of which is less than half of the ink or solvent ink, and the cleaning times of the printing plate and the anilox roller can be greatly reduced, so the overall cost is relatively low. Based on the following characteristics, UV flexo inks have obvious advantages and development prospects from the perspective of environmental protection, quality, and technology development.
The promotion and application of UV flexo printing technology in the country has a process from the current point of view. On the one hand, it is a further understanding and understanding of UV flexo printing technology. On the other hand, it is necessary to improve and perfect the equipment, light sources, supporting equipment, and process technologies. The following comprehensive domestic and international information discusses some issues that should be noted in the application of UV flexo technology.
First, UV light source: UV flexo printing needs to be equipped with 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.
Second, the anilox roller: When using UV flexo ink, the anilox roller mesh angle is preferably 30 ° or 60 °. The following are several common specifications of ceramic anilox roller.
200 line 9.5-11. OBCM Anilox: Can print opaque solid patterns.
360 line 4.5-6.5 BCM Anilox: Printable field and line patterns.
550 line 3.0BCM Anilox: Printable continuously adjustable image product.
650 Line 2.5BCM Anilox Roller: Printable Continuously Adjustable Image Product
800 line 2.0BCM anilox roller: Printable fine continuous tone image product.
Third, the rubber roller: The roller must be able to resist UV ink, usually used rubber roller EPDM rubber (EPDM) or silicone rubber.
Fourth, the media: Although the current use of flexo printing plate can basically be used for UV flexo ink, but it is best to use UV ink resistance better plate, such as DuPont's UVP-67 open plate Wait.
V. Ink Viscosity UV flexo inks have a slightly higher viscosity than water-based inks or solvent-based flexographic inks, and they have a wide range, which can be in the range of 200-1000 CPS, with a typical viscosity of 300-500 cps.
Six, storage: UV flexo ink should be strictly avoid light, avoid heat storage. Storage temperature should be controlled at 5 °C -30 °C, storage shelf life is generally six months.
Seven, additives: UV flexo printing ink commonly used additives are mainly three kinds: 1. UV reactive diluent; 2. UV curing accelerator; 3. UV ink cleaner.
VIII. Security Protection: There are two main points for prevention. One is the harm of UV radiation to the human body and the other is the harm of UV ink to the human body. The former needs to use lightproof material to shield and seal the light source and strengthen the ventilation and discharge treatment. The latter should be operated with gloves to prevent UV ink from directly contacting the skin. For example, UV ink splashed on the skin should be dry rubbed and then used immediately. Wash with water.
UV flexo printing ink and its process technology are still continuously improving, new varieties and new equipment are emerging. All of these will promote more perfect UV flexo technology.
At present, flexographic presses equipped with a UV ink curing system are continuously increasing in foreign countries, and the existing flexographic presses are constantly being modified into UV ink curing systems. Replacing water-based inks and solvent-based inks with UV flexo inks has become a development trend, and has been widely applied to wide-width and narrow-width flexo printing 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, we believe that in the near future, domestic UV flexo technology There must also be a larger development. (Text / Zhu Meisheng)
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