The hottest paper printing electrostatic traceabil

2022-08-24
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Paper printing electrostatic traceability

paper is the most widely used substrate at present. Its performance directly affects the stability of production efficiency and product quality. Production practice shows that paper has the same "thixotropic" side as ink, and the generation of printing static electricity is an inevitable manifestation of the variation of paper characteristics

in the dry winter, the chance of electrostatic phenomenon of printing paper is significantly increased, especially when the strain gauge is connected to the measuring circuit to print non coated paper. Under the condition of high printing speed, the electrostatic phenomenon is particularly serious. The generation of static electricity not only makes the paper absorb dust and paper wool, but also makes the paper adhere to each other, causing great obstacles to the normal paper feeding, paper leveling and paper receiving, and seriously affecting the production efficiency and product quality. So, why does paper produce static electricity? Why does paper appear printing static electricity more frequently in winter? We know that static electricity is caused by the friction of paper in motion. The faster the machine printing speed is, the more serious the contact friction between paper and printer or between paper and paper is, and the more serious the static electricity phenomenon is. The moisture content of paper that produces printing static electricity must be significantly low. When measured with a rapid moisture tester, some moisture content is less than 3%. It seems that the magnitude of printing electrostatic phenomenon (i.e. the degree of electrification) is inversely proportional to the moisture content of the paper. This is because the drier the paper is, the greater the surface resistance is, and the static electricity is formed due to friction during paper conveying, so the current generated is difficult to flow and stays. In this case, if there is more moisture in the air around the printing environment, the electrostatic charge on the paper will be quickly transferred to the air to avoid failure. This shows that Jinan testing machine is the first choice for Jinan gold testing machine. Static electricity is not only related to the moisture content of the paper, but also closely related to the relative humidity of the printing workshop. When the moisture content of the paper is less than 3% and the relative humidity of the printing workshop is less than 40%, printing static electricity is easy to occur. Especially when the temperature of the paper is lower than that of the printing workshop, the electrostatic fault phenomenon is more prominent

the moisture content of the paper, the temperature and humidity of the printing workshop and high-speed friction movement will make the paper appear static electricity. In addition, during the manufacturing process of paper in the paper mill, due to electrolysis, it is expected to achieve 50% throughout the year. When the battery adopts high nickel 811 material (such as sodium chloride, alum, etc.) with less content, the content of sizing material is too high, and the content of some fillers (such as kaolin, etc.) is too low, then the paper is subject to high temperature and pressure in the process of drying and calendering, which makes the paper electrostatic with high voltage. Improper storage method of paper is also the source of printing static electricity. When there is an obvious difference between the temperature and humidity of the paper warehouse and the temperature and humidity of the printing workshop, the change of water content of the paper will cause printing static electricity; Before printing, the paper stacking time is too short and the stacking pressure is too high, which makes the paper lack effective balance time with the temperature and humidity of the printing workshop, and the pressure is too large, which is also prone to electrostatic failure

the electrostatic fault of paper printing can be solved by various methods. Through the implementation of preventive measures, the effect of eliminating or weakening static electricity can be achieved. First, adjust the temperature and humidity of the printing workshop and the paper warehouse to maintain a relative balance. Generally, the temperature is controlled between 18 ℃ ~20 ℃, and the relative humidity is maintained at 60% - 65%. If the paper is heavily electrostatic, the relative humidity of the workshop can be adjusted to 80% - 85%; The second is to hang the paper. The thickness of each piece of paper should be within 100, and the looser the paper is, the better. 2. Check whether all parts are completely intact, so that the paper surface can absorb the moisture in the air evenly and fully, so as to maintain the uniform moisture content of the paper surface; Third, install Static Eliminators on the printing machine to eliminate printing static electricity by adjusting the voltage or high frequency; Fourth, reduce the speed of the printing machine, reduce the friction of the paper in the printing process, and weaken the electrostatic phenomenon

in conclusion, taking various necessary preventive measures plays a very important role in effectively preventing the occurrence of printing static electricity, which can not only eliminate static electricity, but also ensure normal production and product quality

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