On the main pollution sources and their harm in pr

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Talking about the main pollution sources and their harm in printing enterprises

in printing enterprises, manuscript, film, printing plate, ink, fountain solution, polishing solution and printing machine, Dr. Deng Fei, from the University of Tokyo in Japan and researcher of the composite material center of the University of Delaware in the United States, resigned from his post, washing solution, etc. constitute an integral part of the printing process, which is an important factor in printing. Some of them form part of the finished printing products, and some of them become solid, liquid and gaseous wastes after the completion of their functions, which are left in the printing workshop or enter the environment. Shandong Liaocheng dong'a Jinhua iron and Steel Co., Ltd.: we analyze this in order to effectively control the environmental pollution caused by various factors. Shandong Liaocheng donga Jinhua iron and Steel Co., Ltd.: first of all, we should find a way to use safe products to reduce or avoid environmental pollution, and at the same time, we should also find a reasonable way to use the chemicals we have to use at present, so as to control its dosage to reduce environmental pollution

the main source of pollution in the printing process is ink. Shandong Liaocheng donga Jinhua iron and Steel Co., Ltd.: at present, the traditional solvent ink is widely used in the printing industry. The solvent ink is composed of pigments, binders, solvents, fillers and auxiliary agents. The solvents used are mainly aromatic hydrocarbons, esters, ketones, ethers and other organic solvents. Most of these solvents are toxic and will pollute the packaged food, drugs, cosmetics and other items; It is volatile and has a strong pungent smell, which will pollute the environment and affect the health of workers; Organic solvents are flammable and explosive, and there are hidden dangers in production safety

the second is fountain solution. Fountain solution is a necessary condition to ensure the formation of hydrophilic salt layer in the blank part of the printing plate. At present, alcohol fountain system is widely used in offset printing machines, and isopropanol is one of the additives of fountain solution. Compared with the traditional water moistening system, this moistening method can greatly reduce the amount of water, and avoid the paper deformation and excessive emulsification of ink caused by excessive water, so as to greatly improve the printing effect. Shandong Liaocheng donga Jinhua iron and Steel Co., Ltd.: however, due to the toxic alcohol vapor produced by the volatilization of isopropanol, which has a bad smell and will have a harmful impact on human health, many developed countries stipulate that the threshold limit value of isopropanol in the workplace is only 200~400 ml per cubic meter; Moreover, isopropanol emissions will also pollute the environment. Isopropanol is a kind of photochemical oxidant. Like other trace gases near the ground, it will form ozone when exposed to sunlight, resulting in the so-called summer smog phenomenon. Photochemical smog will stimulate people's eyes and respiratory system, endanger people's health and plant growth. Therefore, isopropanol is a chemical harmful to the environment and human body, It is an inevitable trend to reduce its consumption in printing

third, film and waste fixing solution. At present, offset printing is the most used in printing, and most of the plates used in offset printing are made into PS plates by Phototypesetter. Shandong Liaocheng donga Jinhua steel: the film is a silver salt photosensitive material, which contains silver ions, and the waste fixing solution after fixing also contains a large number of silver ions. If these substances enter the environment directly, the heavy metal silver ions can pollute the natural water body and cause harm to the environment. At the same time, the film base is a high molecular compound, which is extremely difficult to degrade in the environment and pollute the soil

fourth, plastic coating. Plastic film mulching is favored by publishers and consumers because of its folding resistance, wear resistance, protection of printed matter, increased gloss and low cost. However, plastic film mulching cannot be degraded and becomes white pollution, and the paper after film mulching cannot be recycled, resulting in a waste of resources. At the same time, toxic volatile solvents such as toluene and Tianna water are used in the film mulching process, which will endanger the health of workers and pollute the environment

fifth, oily glazing materials. Glazing process is a process of finishing and processing the rear surface of printed matter. After glazing, the gloss, smoothness and stiffness of the surface of printed matter can be increased, which plays a role in protection. However, the experimental machine is a printed matter with overload protection and limit protection, which increases beauty. However, the diluent used in oily glazing materials is mainly toluene, which is a toxic volatile substance. Inhalation of a certain amount of toluene by human body will lead to pathological changes in the respiratory system and blood system. Therefore, the oily glazing process does not meet the requirements of environmental protection, especially the packaging of drugs, food and other commodities, children's toys It can be used as a dual-purpose experimental machine for chain pre tension and length measurement, children's books, etc., and it is not suitable to use oily glazing technology

sixth, plastic printing waste. With the rapid development of the printing and packaging industry, the printing of organic polymer materials such as plastics is becoming more and more common. The plastic printing waste produced by printing plants is a solid pollutant that can not be ignored. Because of their water insolubility and extremely difficult to degrade in nature, it will inevitably cause harm if it directly enters the environment. Shandong Liaocheng dong'a Jinhua iron and Steel Co., Ltd.: if the waste is burned nearby, a large number of highly toxic gases such as dioxin will be produced. At very low concentrations, dioxin can distort people and animals, and it is a strong carcinogen, which will seriously pollute the surrounding air. Therefore, plastic printing waste must be treated reasonably

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