The Research Of The Industrial Dielectric Barrier Discharge (DBD) Plasma Equipment At Atmospheric Pressure

In this paper, it is based on previous results of our research group and "Studies on the Surface Modification to Synthetic Fibers and Fabrics Using Atmospheric Pressure Dielectric Barrier Discharge"(No:02SG28) supported by the "Dawn Project" of Shanghai Municipal Education Commission that configuration used to treat material surface by at atmospheric pressure is optimized.The previous DBD plasma equipment is improved in this paper and the wool textile won't be damaged when it is treated under the plasma. The emission spectral lines plasma at atmospheric pressure and the electricity parameters were recorded, the electricity parameters of the equipment is measured and the plasma emission spectra were recorded, the results indict that the discharge power of improved equipment is larger than that of the previous equipment, the intensity of the air plasma falls and the intensity of argon plasma increases after the previous equipment was improved. The hydrophilic property of wool textile after treatment increased considerably and the increases of the K/S value indict the increases of the chromaticity. The XPS analyses indict that the hydrophilicity of the textiles increases because of the increase of the oxygen-containing groups in the surface.A new approach of m-scale equipment to surface modification using DBD plasma at atmospheric pressure is presented in this paper. The relationships among those electricity parameters, such as discharge gap and discharge power, which is measured by Lissajous figure of the oscilloscope, are analyzed by using improved DBD equipment. The results of experiments indict that the improvement of discharge voltage can improve plasma intensity and the 0.5-1.5mm discharge gap is optimum for surface modification of materials. The result is of great importance to dielectric barrier discharge at atmospheric pressure and its application to surface modification of textile materials. The emission spectral lines of argon plasma jet at atmospheric pressure were recorded and the electron excitation temperature was analyzed. The hydrophilic property of wool textile and nonwoven fabrics (PBT) after treatment increased considerably and the contact angle decreased with the increase of the treatment period. The SEM images of wool textile and nonwoven fabrics (PBT) indict that the microstructure of the surface had been changed after treatment.A new approach to surface modification of materials using DBD plasma jet at atmospheric pressure is presented in this paper. The emission spectral lines of argon plasma jet at atmospheric pressure were recorded and the macroscopic temperature of plasma is measured using the liquid-in-glass thermometer. The results show that electron excitation temperature and the macroscopic temperature of plasma increase with increasing applied voltage and decrease with the increasing flow rate of the gas. The macroscopic temperature of plasma is different at the different directions. The experimental results indicate that DBD plasma jet at atmospheric pressure is a new approach to improve the quality of materials' surface modification, and spectral diagnose is proved to be a kind of workable method by choosing suitable applied voltage. After wool treatment using argon plasma jet, its anti-felting property ameliorates evidently.In the process of discharge, impedance matching network of the whole circuitry is in the state of self-adjusting of the designed power. The discharge frequency of power is discussed in this paper. It is shown that the resonant frequency is decided by DBD settings of equipment and the discharge power.