Copying technology is more and more widely used in various fields of people's work, study and life. People have more and more opportunities to contact photocopiers and copies, but its impact on human health has not attracted enough attention. According to foreign research reports, electrostatic copiers have the following three effects on human health:
(1) At present, carbon paper is the most widely used, and dry and wet developing powder is used. The dry developing powder adopts super-grade carbon black, in which polycyclic aromatic hydrocarbons have carcinogenic effect. However, because the carbon black polymer is wrapped after mixing, the dry developing powder rarely decomposes and is very stable when copying. Scientists have found that the developing powder contains a small amount of nitropyrene, which has the ability to change the normal structure of chromosomes and will lead to tumors. After technical improvement, the content of nitropyrene in dry developing powder is greatly reduced, and its carcinogenic effect can not be detected by conventional methods. Wet developing powder disperses carbon black in hydrocarbon solvent, and aliphatic hydrocarbon containing 10 ~ 20 carbon atoms is helpful for tumor growth. Because the hydrocarbons used are volatile because of their low boiling points, poor ventilation will cause harm to long-term contact.
(2) The developing material of carbonless copier is very irritating, which can cause diseases of skin, eyes, respiratory tract and nervous system. In addition, carbon-free copying will also release some substances that may cause cancer during copying.
(3) When the copier is working, there is some ozone in the copying room due to static electricity. Ozone has a strong oxidizing effect. 1988165438+10, the survey results released by Japan's National Institute of Public Health showed that the ozone concentration in places where photocopiers are frequently used is enough to cause harm to human body. Through the monitoring of some offices and public libraries that use photocopiers, it is found that the ozone concentration at a distance of 0.5m from the photocopiers is 0.12 mg/L. These ozone are produced by the chemical reaction between the parts with high voltage in the copier and the air. Ozone has a high oxidation effect, which can turn nitrogen into nitrogen oxides and has a strong irritation to human respiratory tract. The heavy ozone ratio and slow flow rate, coupled with poor dust-proof and ventilation in the copy room, easily lead to copier syndrome for copier operators. The main symptoms are dry mouth and throat, chest tightness, cough, dizziness, headache and decreased vision. In severe cases, toxic edema may occur, which may also cause symptoms of mental system. In addition, the skin allergy symptoms of some copier operators may also be related to the pollution caused by contact with copy paper, because copy paper contains some special additives, which will produce paper dust during copying.
People who have been engaged in photocopying for a long time should pay attention to strengthening labor protection. Conditional can be installed in the studio exhaust fan or exhaust pipe, so that indoor ozone and nitrogen oxides can be discharged to the outside in time. Dust removal equipment should be installed in rooms with many copiers and heavy workload to reduce dust. Alcohol should be used when cleaning the developing powder, and benzene solvents should not be used. The copier should be covered with objects to block the stimulation of strong light. Copier operators should also increase the intake of vitamin E to protect cell biofilm from nitrogen oxides. In addition, if you have respiratory diseases, insomnia, dizziness and pregnant women, it is best not to operate the copier.