Abstract: After entering WTO, the environmental protection advantages of flexographic printing and its overall development trend in the field of packaging and printing will be very obvious. This article fully demonstrates the above points of view from the flexographic printing process, consumables and other aspects.
In order to enter a high-tech and civilized society, apart from mastering the skills of survival, human beings have entered the stage of self-protection and sustainable development due to the development of science and technology. Therefore, attention should be paid to the unfavorable phenomena of the ecological environment and human health. For example, scientists have now discovered that the climate temperature in most parts of the world is known to be high, which is called the heat island effect. Humans are threatened if they are not controlled and uncontrolled. All countries in the world attach great importance to it.
Last year, China joined the WTO, and international trade has increased. This shows that China’s overall national strength has increased and it can compete in the international community. But first of all, we need to understand that we must compete with international laws and regulations. Now in the international competition, there are two aspects that need to be taken seriously: 1) environmental pollution, and 2) technical barriers. Some national trade laws and regulations, in addition to strict compliance with environmental protection requirements, also protect domestic products and limit imports of foreign goods. In each of these two aspects, various technical documents have been formulated, and these technical documents are basically legal. For example, the provisions for food include packaging, which means that not only food safety must comply with environmental protection requirements, but also packaging, and whether the printed matter has environmental pollution problems. After joining the WTO, it must be raised to the agenda and aroused widespread concern.
The impact of printed products on environmental protection is understood to be limited in two aspects internationally: 1) The residual content of solvents is not allowed to exist or exceed the standard, where the deep-agents mainly refer to benzene, esters, ketones, etc.; 2) heavy metal The content of lead, cadmium, and mercury must comply with European 94/62/EC. The metal concentration must not exceed 100 PPM. The above two limitations are all derived from ink. In our opinion, the thickness of the ink layer on paper and other printing substrates is only a few microns, which is not so severe for environmental protection and human health. It is insignificant. However, it is not controversial that the law is straight. Not long ago, Shanghai's KFC restaurant changed the printing method of pad and other materials on food trays from original offset printing to flexo printing, which is an example of environmental protection requirements.
The ink used in flexographic printing has its unique advantages. At present, there are three types of flexographic printing inks: 1) aqueous ink, 2) alcohol-soluble ink, and 3) UV ink. In particular, water-based inks do not contain solvents, so there is no residual solvent content, and it is recognized as an environmentally friendly ink that has been used in large quantities. The alcohol solvent in methanol-free alcohol-soluble ink is much less contaminated than benzene, ester, and ketone. Trace amounts of alcohol do not affect human health. Most of the overseas plastic film printing products we see use flexographic printing and use alcohol-soluble inks, so alcohol-soluble inks are environmentally-friendly inks that can be widely promoted. UV inks also do not contain solvents and do not pollute the environment after UV drying. Since the UV ink itself has no solvent, and the UV light is dried; the ultraviolet lamp power used by the UV ink is 400W each, and at least 10 UV lamps are required for a color group on a flexo printer. Therefore, the printing product using the UV ink is also environmentally friendly. Type.
The heavy metals in inks are mainly stricter than inorganic pigments and fillers, and flexographic printing inks have a large fluidity and low viscosity, and almost no inorganic pigments and fillers are used. In addition, dyestuffs can be added to the inks used in flexographic printing. On the other hand, inks are improved. The color concentration of the pigment, on the other hand, makes the other ink less.
The advantages of using flexographic printing inks are unmatched by other printing methods. Offset ink transfer system is a long ink way. More than 10 ink rollers are designed for use with thick inks. If water-based inks are used in long ink paths, the ink will dry up in the middle and cannot be transferred to the plate. When shutting down, the water-based ink can not stay again, and it should not be controlled. In addition, offset printing uses the principle of oil-water repulsion to complete the printing. Therefore, the fat-sensitive and hydrophilic portions of the printing plate should be used as the wetted non-graphic portion of the fountain solution of the main body. Therefore, ink and ink cannot be used. Larger ink?br>Gravure printing without ink roller, its plate cylinder is the ink roller, together with the impression roller can form a color group, so the machine structure is simpler than the flexographic printing machine, so it is also For short ink paths, you can use inks with high fluidity. It has also been known that the use of water-based ink for gravure printing has not been promoted. The main problem is that the part of the gravure cylinder engraving is metal electrolytic copper. Although electrolytic copper is protected by electroplated chromium, the water-based ink is alkaline. The drum is immersed in the alkaline ink, which is likely to cause chemical corrosion and damage. Secondly, a large part of the gravure printing base is plastic. The fastness of the water-based ink on the plastic is not satisfactory enough. Problems can be solved, and gravure printing can also be environmentally friendly printing. The gravure printing process has matured in China, and the current development trend is good, but if it still stays in the ink using benzene solvent, it will inevitably hinder the development.
The three key technologies that make up the flexographic printing are: 1) a rubber-based elastic printing plate; 2) a metal anilox roller; and 3) an ink with low viscosity and high fluidity. The three are complementary, closely related, indispensable, and closely linked, such as the use of metal anilox roller transfer structure, there is only one ink roller, it is impossible to uniform the thick ink, so you can only use small viscosity flow Large inks, as well as rubber type printing plates, cannot use organic solvents, otherwise the printing plates will swell, corrode, and be damaged, so only inks such as water-based inks can be used. The unique structure and printing principle of flexographic printing are uncontroversial. Packaging printing requirements, so it is currently the only, ideal, recognized green printing.
The above brief analysis of the relationship between plain, concave and soft printing methods and environmental protection is expected to arouse everyone's attention and attention.
Water-based inks have been identified as non-toxic inks by the U.S. Food and Drug Association. The safety of UV inks has also been the United States Environmental Protection Agency. Flexographic printing accounts for 75% of packaging printing in the United States, and the proportion is much higher. Although there are environmental protection factors, other features such as flexographic printing quality can meet the packaging requirements, can be online operations, multi-process production at one time, occupying less area and managing Convenient, low cost, but also in line with market needs.
As China's accession to the WT and environmental protection awareness increase, and take the road of sustainable development, green safe, environmentally friendly flexo printing, will win more and more favors, no doubt this will promote and develop China's flexographic printing Play a positive and beneficial role. Currently engaged in food packaging, pharmaceutical packaging, cosmetics packaging, gift packaging and printing units, but not yet engaged in flexographic printing, it should be rainy days.
In order to enter a high-tech and civilized society, apart from mastering the skills of survival, human beings have entered the stage of self-protection and sustainable development due to the development of science and technology. Therefore, attention should be paid to the unfavorable phenomena of the ecological environment and human health. For example, scientists have now discovered that the climate temperature in most parts of the world is known to be high, which is called the heat island effect. Humans are threatened if they are not controlled and uncontrolled. All countries in the world attach great importance to it.
Last year, China joined the WTO, and international trade has increased. This shows that China’s overall national strength has increased and it can compete in the international community. But first of all, we need to understand that we must compete with international laws and regulations. Now in the international competition, there are two aspects that need to be taken seriously: 1) environmental pollution, and 2) technical barriers. Some national trade laws and regulations, in addition to strict compliance with environmental protection requirements, also protect domestic products and limit imports of foreign goods. In each of these two aspects, various technical documents have been formulated, and these technical documents are basically legal. For example, the provisions for food include packaging, which means that not only food safety must comply with environmental protection requirements, but also packaging, and whether the printed matter has environmental pollution problems. After joining the WTO, it must be raised to the agenda and aroused widespread concern.
The impact of printed products on environmental protection is understood to be limited in two aspects internationally: 1) The residual content of solvents is not allowed to exist or exceed the standard, where the deep-agents mainly refer to benzene, esters, ketones, etc.; 2) heavy metal The content of lead, cadmium, and mercury must comply with European 94/62/EC. The metal concentration must not exceed 100 PPM. The above two limitations are all derived from ink. In our opinion, the thickness of the ink layer on paper and other printing substrates is only a few microns, which is not so severe for environmental protection and human health. It is insignificant. However, it is not controversial that the law is straight. Not long ago, Shanghai's KFC restaurant changed the printing method of pad and other materials on food trays from original offset printing to flexo printing, which is an example of environmental protection requirements.
The ink used in flexographic printing has its unique advantages. At present, there are three types of flexographic printing inks: 1) aqueous ink, 2) alcohol-soluble ink, and 3) UV ink. In particular, water-based inks do not contain solvents, so there is no residual solvent content, and it is recognized as an environmentally friendly ink that has been used in large quantities. The alcohol solvent in methanol-free alcohol-soluble ink is much less contaminated than benzene, ester, and ketone. Trace amounts of alcohol do not affect human health. Most of the overseas plastic film printing products we see use flexographic printing and use alcohol-soluble inks, so alcohol-soluble inks are environmentally-friendly inks that can be widely promoted. UV inks also do not contain solvents and do not pollute the environment after UV drying. Since the UV ink itself has no solvent, and the UV light is dried; the ultraviolet lamp power used by the UV ink is 400W each, and at least 10 UV lamps are required for a color group on a flexo printer. Therefore, the printing product using the UV ink is also environmentally friendly. Type.
The heavy metals in inks are mainly stricter than inorganic pigments and fillers, and flexographic printing inks have a large fluidity and low viscosity, and almost no inorganic pigments and fillers are used. In addition, dyestuffs can be added to the inks used in flexographic printing. On the other hand, inks are improved. The color concentration of the pigment, on the other hand, makes the other ink less.
The advantages of using flexographic printing inks are unmatched by other printing methods. Offset ink transfer system is a long ink way. More than 10 ink rollers are designed for use with thick inks. If water-based inks are used in long ink paths, the ink will dry up in the middle and cannot be transferred to the plate. When shutting down, the water-based ink can not stay again, and it should not be controlled. In addition, offset printing uses the principle of oil-water repulsion to complete the printing. Therefore, the fat-sensitive and hydrophilic portions of the printing plate should be used as the wetted non-graphic portion of the fountain solution of the main body. Therefore, ink and ink cannot be used. Larger ink?br>Gravure printing without ink roller, its plate cylinder is the ink roller, together with the impression roller can form a color group, so the machine structure is simpler than the flexographic printing machine, so it is also For short ink paths, you can use inks with high fluidity. It has also been known that the use of water-based ink for gravure printing has not been promoted. The main problem is that the part of the gravure cylinder engraving is metal electrolytic copper. Although electrolytic copper is protected by electroplated chromium, the water-based ink is alkaline. The drum is immersed in the alkaline ink, which is likely to cause chemical corrosion and damage. Secondly, a large part of the gravure printing base is plastic. The fastness of the water-based ink on the plastic is not satisfactory enough. Problems can be solved, and gravure printing can also be environmentally friendly printing. The gravure printing process has matured in China, and the current development trend is good, but if it still stays in the ink using benzene solvent, it will inevitably hinder the development.
The three key technologies that make up the flexographic printing are: 1) a rubber-based elastic printing plate; 2) a metal anilox roller; and 3) an ink with low viscosity and high fluidity. The three are complementary, closely related, indispensable, and closely linked, such as the use of metal anilox roller transfer structure, there is only one ink roller, it is impossible to uniform the thick ink, so you can only use small viscosity flow Large inks, as well as rubber type printing plates, cannot use organic solvents, otherwise the printing plates will swell, corrode, and be damaged, so only inks such as water-based inks can be used. The unique structure and printing principle of flexographic printing are uncontroversial. Packaging printing requirements, so it is currently the only, ideal, recognized green printing.
The above brief analysis of the relationship between plain, concave and soft printing methods and environmental protection is expected to arouse everyone's attention and attention.
Water-based inks have been identified as non-toxic inks by the U.S. Food and Drug Association. The safety of UV inks has also been the United States Environmental Protection Agency. Flexographic printing accounts for 75% of packaging printing in the United States, and the proportion is much higher. Although there are environmental protection factors, other features such as flexographic printing quality can meet the packaging requirements, can be online operations, multi-process production at one time, occupying less area and managing Convenient, low cost, but also in line with market needs.
As China's accession to the WT and environmental protection awareness increase, and take the road of sustainable development, green safe, environmentally friendly flexo printing, will win more and more favors, no doubt this will promote and develop China's flexographic printing Play a positive and beneficial role. Currently engaged in food packaging, pharmaceutical packaging, cosmetics packaging, gift packaging and printing units, but not yet engaged in flexographic printing, it should be rainy days.
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