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In the process of labeling and labeling of self-adhesive labels , static electricity can be said to be ubiquitous, which causes us a lot of trouble. Therefore, we need to correctly understand and adopt appropriate methods to eliminate static electricity.
The main cause of static electricity is friction. When two solid materials are in contact and quickly exit, one of the materials has a greater ability to adsorb electrons to transfer electrons to the surface of the material, causing the surface of the material to exhibit a negative charge and the other material to exhibit a positive charge. During the printing process, all substances involved in printing generate static electricity due to friction, impact and contact between different substances. Once charged with static electricity, especially film materials, it is often found that the edge of the printed product is burr-like and overprinted due to ink spillage during printing; the ink may be affected by static electricity to cause shallow web or missing ink; film and ink adsorption environment Foreign matter such as dust and hair is prone to quality problems such as knives.
Static elimination method in printing
With a full understanding of static electricity, we have many ways to eliminate static electricity. The best way is to eliminate the nature of the material by using the characteristics of static electricity.
Ground elimination method
In the process of installation, the printing and labeling equipment usually uses a metal conductor to eliminate the electrostatic substance and the ground connection, and eliminates the static electricity generated during the operation of the equipment by the equipotentiality with the earth, but this method has no effect on the insulator.
2. Humidity control elimination method
The surface resistance of the printed material decreases as the humidity of the air increases, so increasing the relative humidity of the air can increase the conductivity of the surface of the material, thereby effectively eliminating static electricity. Generally speaking, the suitable environmental conditions for the printing workshop are: the temperature is about 20 °C, and the ambient humidity is about 60%. If the static elimination function of the processing equipment itself is insufficient, the ambient humidity can be appropriately increased, the humidification equipment can be installed in the printing workshop, or artificial. Cleaning the floor with a wet mop can increase the ambient humidity and effectively eliminate static electricity.
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