Offset printing process Green environmental protection measures Environmental issues Environmental performance problems in offset printing processes include organic compounds (VOC) in offset ink solvents and organic compound gas contamination in multi-ring aromatic solvents (PCA). Heavy metals in inks, packaging and printing products Wastes (recycled paper), pollution problems caused by burning (dioxin), water pollution caused by dampening fluid discharge, and pollution caused by cleaning agents.
Solution 1. Development of non-alcoholic printing and waterless offset printing technology Currently, the most effective method to reduce the use of organic compounds in the offset printing process is to develop non-alcoholic printing and waterless offset printing technology.
Since the use of alcohols in the printing process, people have been exploring ways to eliminate the use of alcohols. Because alcohol vapors are a major factor in the health hazards of printing shops, alcohol can also pollute the environment. At present, people have developed alcohol-free fountain solution, and foreign countries have developed an alcohol substitute called subS-tifiX hd. After extensive tests, it has been confirmed that it is a product that is safe to the human body and the environment. We know that the greatest role of alcohols is to reduce the surface tension of the offset printing plate, so that the non-graphical part of the PS plate wets well. Therefore, the development of non-alcoholic printing should start from the interface chemical properties and rheology to make the ink have good characteristics.
Waterless offset printing refers to a type of lithographic printing method that uses special ink to complete the printing without the use of an aqueous solution dampening, but uses an ink-repellent silicone layer as a blank part of the printing plate. Waterless offset printing eliminates fountain solution and eliminates alcohols, which is of great significance to environmental protection. Many advantages of waterless offset printing are unmatched by ordinary offset printing methods. For example, waterless offset printing is of great significance in the use of recycled paper, because recycled paper fibers are short, unlike the non-recycled paper, which has high surface strength and is easily limited by traditional offset printing; Water offset printing without the fountain solution, you can maintain the original strength of the paper, to solve the restrictions on the development of traditional offset printing on recycled paper, the protection of forest resources, recycling waste paper is of great significance. Other advantages of waterless offset printing include less preparation time and paper waste (this is especially important for digital short-duration digital printing on the machine), there is no problem of the removal of the remaining fountain solution additives, only the air in the press room Less volatile organic compounds, etc.
Waterless offset printing is a huge leap forward in lithographic offset technology. In recent years, waterless offset printing has been adopted in foreign countries, and waterless offset printing is gradually accepted by people in China. A few companies have begun to carry out waterless offset printing on the structure adjustment of the original offset printing equipment and achieved good economic benefits. It opened up a precedent for the development of waterless offset printing in China. Although there are few printing plants actually used in waterless offset printing, from the perspective of environmental protection, all new technologies, new materials, new processes, and new equipment that are conducive to environmental protection will have great future development potential. Estimated. It can be foreseen that waterless offset printing is an advanced printing method. With the continuous development of digital technology, people will eventually exert their enormous advantages in constant exploration and become an inevitable choice for people.
2. Development of environmentally friendly offset printing inks The development of environmentally friendly offset printing inks currently focuses on the development and use of new solvents for offset printing. Aromatic solvents used in offset printing inks have attracted great attention in developed countries. For example, Japan has stopped producing aromatic mineral oil solvents, and oil companies have introduced ink solvents without aromatic ingredients - "AF series solvents." Affected by VOC emission standards and environmental adaptability, the United States has begun to use soy oil (SOY) instead of mineral oil solvents as offset ink solvents. Initially, soybean oil was developed to rejuvenate U.S. soybean agriculture and meet VOC restrictions, from US News. The Publishing Association (ANPA) initiated the use of soybean oil ink to print newspapers. Now in the United States, soy inks are gradually replacing mineral oil inks that use condensing rotary offset inks and gradually consider palm oil instead of mineral oil solvents.
In addition, the offset printing process should also promote the use of good environmental performance inks, such as water-based offset inks, aqueous offset inks are aqueous acrylate-linked inks, no mineral oil, no volatile organic solvents, through the evaporation of water It is suitable for printing on traditional offset printing machines, and it is particularly suitable for small size sheet-fed offset printing machines and short-run printings. Ordinary offset presses can be modified to use environmentally friendly UV inks.
It should be noted that reducing the organic compounds in the fountain solution, and using decarbonated mineral oil solvents and more vegetable oils (such as soybean oil) to make inks and other technologies are the main green development directions for today's offset printing inks. (To be continued)
Solution 1. Development of non-alcoholic printing and waterless offset printing technology Currently, the most effective method to reduce the use of organic compounds in the offset printing process is to develop non-alcoholic printing and waterless offset printing technology.
Since the use of alcohols in the printing process, people have been exploring ways to eliminate the use of alcohols. Because alcohol vapors are a major factor in the health hazards of printing shops, alcohol can also pollute the environment. At present, people have developed alcohol-free fountain solution, and foreign countries have developed an alcohol substitute called subS-tifiX hd. After extensive tests, it has been confirmed that it is a product that is safe to the human body and the environment. We know that the greatest role of alcohols is to reduce the surface tension of the offset printing plate, so that the non-graphical part of the PS plate wets well. Therefore, the development of non-alcoholic printing should start from the interface chemical properties and rheology to make the ink have good characteristics.
Waterless offset printing refers to a type of lithographic printing method that uses special ink to complete the printing without the use of an aqueous solution dampening, but uses an ink-repellent silicone layer as a blank part of the printing plate. Waterless offset printing eliminates fountain solution and eliminates alcohols, which is of great significance to environmental protection. Many advantages of waterless offset printing are unmatched by ordinary offset printing methods. For example, waterless offset printing is of great significance in the use of recycled paper, because recycled paper fibers are short, unlike the non-recycled paper, which has high surface strength and is easily limited by traditional offset printing; Water offset printing without the fountain solution, you can maintain the original strength of the paper, to solve the restrictions on the development of traditional offset printing on recycled paper, the protection of forest resources, recycling waste paper is of great significance. Other advantages of waterless offset printing include less preparation time and paper waste (this is especially important for digital short-duration digital printing on the machine), there is no problem of the removal of the remaining fountain solution additives, only the air in the press room Less volatile organic compounds, etc.
Waterless offset printing is a huge leap forward in lithographic offset technology. In recent years, waterless offset printing has been adopted in foreign countries, and waterless offset printing is gradually accepted by people in China. A few companies have begun to carry out waterless offset printing on the structure adjustment of the original offset printing equipment and achieved good economic benefits. It opened up a precedent for the development of waterless offset printing in China. Although there are few printing plants actually used in waterless offset printing, from the perspective of environmental protection, all new technologies, new materials, new processes, and new equipment that are conducive to environmental protection will have great future development potential. Estimated. It can be foreseen that waterless offset printing is an advanced printing method. With the continuous development of digital technology, people will eventually exert their enormous advantages in constant exploration and become an inevitable choice for people.
2. Development of environmentally friendly offset printing inks The development of environmentally friendly offset printing inks currently focuses on the development and use of new solvents for offset printing. Aromatic solvents used in offset printing inks have attracted great attention in developed countries. For example, Japan has stopped producing aromatic mineral oil solvents, and oil companies have introduced ink solvents without aromatic ingredients - "AF series solvents." Affected by VOC emission standards and environmental adaptability, the United States has begun to use soy oil (SOY) instead of mineral oil solvents as offset ink solvents. Initially, soybean oil was developed to rejuvenate U.S. soybean agriculture and meet VOC restrictions, from US News. The Publishing Association (ANPA) initiated the use of soybean oil ink to print newspapers. Now in the United States, soy inks are gradually replacing mineral oil inks that use condensing rotary offset inks and gradually consider palm oil instead of mineral oil solvents.
In addition, the offset printing process should also promote the use of good environmental performance inks, such as water-based offset inks, aqueous offset inks are aqueous acrylate-linked inks, no mineral oil, no volatile organic solvents, through the evaporation of water It is suitable for printing on traditional offset printing machines, and it is particularly suitable for small size sheet-fed offset printing machines and short-run printings. Ordinary offset presses can be modified to use environmentally friendly UV inks.
It should be noted that reducing the organic compounds in the fountain solution, and using decarbonated mineral oil solvents and more vegetable oils (such as soybean oil) to make inks and other technologies are the main green development directions for today's offset printing inks. (To be continued)
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