| The surface modification of chemical fiber and textile is an important subject with academic significance and practical profit. Plasma modification is a kind of sanitary and dry processing method. So it has huge market potential and development prospects. But corona discharge plasma and dielectric barrier discharge (DBD) plasma are easy to damage them when processing fabrics. The usual low-pressure glow discharge plasma has to be operated in a reactor with vacuum system. So they are difficult to realize the industrial applications. In order to make it possible to industrialize the plasma modification of chemical fabrics. The Atmospheric Pressure Glow Discharge Plasma (APGDP) and its modification technique of fabric become a hot point of research in recent years. Under the support of National Natural Science Foundation of China (No: 10075010), the research on the characteristics of APGDP and the modification of silpron fabric has being carried out in our lab. The thesis is a part of this research.In this thesis the homemade APGDP reactor, which was equipped with power supply of 10 or 20 kHz, is introduced at first. Then the results of PET (Polyethylene Terephthalate) fabric modification with this device are described. The PET is well modified. But if we want to make PP (Polypropylene) modified, it is necessary to develop a new inverter with variable frequency from 1 kHz to 5 kHz, maximum output voltage 15kV and power 3kW, and then to establish the atmospheric pressure glow discharge plasma in air or other gas needed for modifying PP. As a main part of my work, new power supply system, (including main circuit, control and driving circuit, and detecting and display circuit) is described in more detail. By use of the new power supply, the Voltage-Ampere characteristic of discharge and the preliminary results of PET modification are described. The results showed that both discharge and modification effect are better than the former, and the design of the power supply is basically successful. Finally, some suggestion about the whole experiment system including the power supply, the reactor and modification method are given in this thesis. |
