Analysis of factors affecting cleaning efficiency of atmospheric pressure plasma cleaning machine process parameters

• Categories:Company Dynamics
• Author:plasma cleaning machine-surface treatment equipment-CRF plasma machine-Sing Fung Intelligent Manufacturing
• Origin:
• Time of issue:2021-03-24
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(Summary description)Low pressure plasma cleaning machine is a typical plasma cleaning equipment. Because the production of plasma needs to be carried out under the condition of low pressure, vacuum equipment and closed system are needed, the cost of equipment is high, the operating space and the size of items to be cleaned are easily limited, which is not conducive to large-scale industrial production. So in recent years, the development of atmospheric plasma and its cleaning technology has attracted much attention. Atmospheric pressure jet plasma spray gun is a capacitance-coupled RF discharge device. Its plasma characteristics are similar to glow discharge. When cleaning the material surface, the working gas can be selected according to the characteristics of the pollutants to be cleaned. In addition, there is a atmospheric air dielectric barrier discharge plasma cleaning device, which can be used to clean the surface of continuous fibers, fabrics and other large fabrics under atmospheric pressure. Dielectric barrier discharge (DBD) can produce macroscopic uniform and stable plasma with high discharge intensity and high processing efficiency. During the cleaning process of atmospheric pressure plasma cleaning machine, the main factors affecting the cleaning efficiency of equipment parameters are as follows: (1) Discharge pressure: in the case of low-voltage plasma, discharge pressure increases, plasma density increases, and electron temperature decreases; The cleaning effect of plasma depends on the density of plasma and the temperature of electrons. The higher the density of plasma, the faster the cleaning speed will be. The higher the temperature of electrons, the better the cleaning effect will be. The discharge pressure selection is the key in the process of low-voltage plasma cleaning. (2) Gas types: there are a variety of pollutants on the substrate and surface of the items to be treated, while the plasma cleaning speed and cleaning effect generated by different gas discharges are widely different. Therefore, working gas plasma should be selected specifically. For example, oxygen plasma can be used to remove oil stains on the surface of objects, and mixed gases such as hydrogen and argon can be used to remove the oxide layer. (3) Discharge power: the greater the discharge power, the greater the density of plasma, the greater the energy of active particles, and the better the cleaning effect. For example, the discharge power has a large effect on the density of oxygen plasma. (4) Contact time: the contact time of the material to be cleaned in the plasma has an important influence on the cleaning effect of the plasma and the working efficiency of the plasma. Long contact time, the cleaning effect is better, but the work efficiency is reduced. Also, too long cleaning time can cause damage to the material surface. (5) transmission speed: for atmospheric plasma cleaning process, continuous transmission will be involved when dealing with large objects. The results show that the slower the relative moving speed of the cleaned object and electrode is, the better the treatment effect is. However, too slow a speed on the one hand affects the work efficiency, on the other hand, it will cause damage to the material surface, and the treatment time is too long. (6) Others: parameters such as gas distribution, gas flow rate and electrode setting in the cleaning process of atmospheric pressure plasma cleaning machine will also have an impact on the cleaning effect. Therefore, specific process parameters should be set according to the actual situation and cleaning requirements.