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Cause Analysis and Elimination of Static Electricity in Packaging bags and Printing

China YLTpacking packaging editor: In the process of printing production, sometimes paper or printed products are attracted to each other and stick together, as if the paper surface has a strong vacuum suction, and it is difficult to separate. This phenomenon is printing static electricity. In the dry winter, the static electricity phenomenon of printing paper is particularly prominent, which may cause obstacles to normal paper feeding, delivery and aligning, and in severe cases, automatic paper feeding cannot be performed or double sheets and empty sheets frequently occur. Undesirable consequences such as sheet and delivery disorder, increased loss, etc., not only reduce production efficiency but also affect product quality. Therefore, the correct understanding of printing static electricity and mastering the coping methods have positive significance for promoting production. When the water content of the paper is high, it can become an electrical conductor; on the contrary, when the water content is very low, it has insulating properties. In this case, the paper is more prone to static electricity. Reasons for Static Electricity First, the discomfort of the papermaking process easily makes the paper electrostatically charged. That is, during the papermaking process, due to the low content of electrolytes (adding alum, sodium chloride, etc.), the content of sizing substances is too high, and the content of some fillers (such as kaolin, etc.) is low, the paper is in the drying and calendering process. In the middle, it will be affected by high temperature and pressure, which will make the paper charged with high voltage static electricity. Second, improper storage of paper can also generate static electricity. For example, when there is a large disparity between the temperature of the paper library and the temperature of the printing workshop, the variation of the moisture content of the paper will not only cause the expansion and contraction of the paper to affect the registration, but also easily cause static electricity to bring inconvenience to the printing. In addition, the paper laying time before printing is too short or the stack of paper is too high, so that there is no effective balance time between the temperature and humidity of the paper and the printing environment, and the stack of paper is too heavy, causing static electricity on the paper. Third, static electricity caused by printing friction. For example, when the water content of the paper is obviously low, the paper will be too dry, so that the paper will be subject to friction and pressure during the printing process, resulting in the gain and loss of electrons outside the nucleus of the paper, and the paper will be affected by friction and pressure during the printing process. Static phenomenon. There is one reason for the static electricity of paper, and there are also several adverse conditions that are concurrently formed, and the situation is different. All kinds of paper are even the same kind of paper, the size of the static electricity of this batch and the previous batch of paper is not necessarily the same, that is to say, the voltage level will be different. Another feature is that the two sides of the paper are opposite to each other after being charged, and the front and back sides of the paper are the same when they are printed, that is, the front side is up or the back side is up. It is not easy to separate, which brings certain obstacles to printing paper feeding, transmission, and paper alignment. At the same time, it will not only affect the production efficiency and product quality (such as easy to cause overprinting, misregistration and cascading failure), but also increase the loss of printed products, so measures should be taken to eliminate printing static electricity and ensure normal printing. To prevent the occurrence of printing static electricity, we must first control it from the source. For paper with static electricity, it can be temporarily used, and the inventory time can be extended appropriately. The temperature and humidity of the paper warehouse should be controlled. The temperature in the warehouse should be controlled at 18℃~20℃.

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