As we all know, the electrostatic phenomenon is mainly reflected in the surface of the object, and printing is carried out on the surface of the object. During the printing process, due to the repeated impact and friction between different substances, all the printed objects will be charged with static electricity. The editor will analyze and solve the static electricity problem, which is a headache for the printing industry, from the following three major sections.
NO.1 Three major factors
①Technical influence
Objects will be subject to factors such as extrusion, friction, contact, peeling, machine speed, etc., which will cause the surface temperature of the object to rise, which is prone to thermal decomposition of molecules, resulting in the redistribution of electrons and the generation of static electricity.
②Influence of equipment raw materials
Most of the printing machines are metal objects, and the outermost electrons of the metal body are easily separated from the attraction of the nucleus and become free electrons, so the metal objects have the ability to conduct electric charges quickly. In printing, the frictional electrification of paper, lining, wire and tape, etc., causes the surface condition of the object to have a great influence on static electricity.
③Environmental impact
When the air temperature of the printing place rises, the thermal decomposition of the molecules and the hot spot effect will be more severe, which will greatly increase the accumulation of static electricity. Temperature and humidity are interrelated. An increase in temperature will make the air dry and the relative humidity of a space will decrease. Humidity has a much greater impact on static electricity than temperature.
① Harm to printing quality
Due to the influence of static electricity, a lot of dust and impurities will be adsorbed on the paper, and the paper on the delivery table will attract each other and stick together, so that the aligning device cannot align them, and at the same time, double-sheet failures often occur, resulting in inaccurate overprinting. , ghosting, blurring of pictures and texts, etc., also have an impact on the folding work of the next process.
In printing, high-speed contact separation and friction will cause the ink to generate static electricity, forming relatively fixed light-colored ink spots. This not only affects the quality of the printed product, but also reduces the service life of the printing press.
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② Harm to the human body
Printing workers often come into contact with electrified sheets and piles of paper while operating in the workshop. When the finger in operation touches the casing or metal parts of the printing machine, the static electricity of the human body will be discharged from the finger to the casing of the printing machine, so that the static electricity leaks into the ground, and the human body is shocked.
Although the electric shock of printing static electricity is only an instant shock electric shock, and the discharge current is only at the microamp level, but it is worth noting that the sudden electric shock brings acupuncture and numbness to people, which will make people nervous and even Affect the operation of printing workers, and may cause product or personal accidents in severe cases.
③Cause fire and explosion
In the operation of high-speed printing presses, a large amount of static electricity will be generated due to the strong friction in high-speed operation, and spark discharges are prone to occur. When the amount of discharge sparks reaches the minimum ignition energy of gasoline and alcohol, it will cause fire and explosion hazards.
①Release elimination method
After printing static electricity, the electrostatic charge will be released naturally through various ways, but the release speed is very slow. In order to prevent the accumulation of static electricity, the release of static electricity must be accelerated. Usually, antistatic additives are used and sprayed on the surface of insulating materials. When the surface of the material absorbs moisture in the air to form ink, the resistance decreases, the conductivity is enhanced, and the electrostatic charge is released quickly.
②Neutralization and elimination method
Use a static elimination device to eliminate static electricity on the surface of the material. The static elimination device uses the ions generated by corona discharge to accelerate the neutralization of the electrostatic charge on the surface of the material. Therefore, the static elimination device is also called an electrostatic neutralizer. At present, the common static elimination devices on the market are ion air nozzles, ion fans, and ion air bars. It can effectively eliminate static electricity, improve the quality of printed products and ensure production safety.
NO.4 Conclusion
With the development of science and technology, the methods of overcoming static electricity are constantly being updated. The static elimination device produced by Sindin Precision has been widely used in mobile phones, semiconductors, films, printing and other industries. , Insulator workpiece, do not want to apply conductive material occasions.