Choi، نويسنده , , In S and Hwang، نويسنده , , Seok W and Park، نويسنده , , Jong C، نويسنده ,
Recently, the study on the application of atmospheric plasma treatment has gradually increased because it requires high cost vacuum systems, and the flexibility of application to a continuous process. This paper reports on the new application of medium frequency atmospheric plasma to the continuous surface cleaning of aluminum wire for magnet wire manufacturing. Magnet wire is widely used for transformers and motors. It is composed of a metallic conductor of copper or aluminum, and various types of enamel coated layers as insulator. Copper has been mainly used as a conductor of magnet wire. The use of aluminum conductor has gradually increased, replacing the copper and thus, reducing the wire weight. In order to be used as a conductor of magnet wire, the copper or aluminum wire should be drawn to a proper size. After that, the drawn wire is coated with enamel varnish, and is finally annealed at a temperature of approximately 400°C. In this process, in order to obtain enough bonding strength between conductor and enamel, the drawn wire should have a clean surface without lubrication oil residuals from the wire drawing process. As the lubrication oil for aluminum wire drawing is highly viscous and insoluble in water, tri-chloroethane (1,1,1-TCE), one of the most powerful cleaning agents has been most widely used. However, the manufacture and use of 1,1,1-TCE is restricted by law due to its environmental impact on the ozone layer. This study was performed to solve the environmental problems of conventional chemical cleaning agents such as 1,1,1-TCE by applying a medium frequency atmospheric plasma treatment. Medium frequency and high voltage power supplier (20 kHz, 7∼1.5 kV) was used as a plasma power source, and a tube type electrode was prepared for continuous wire cleaning process. For the evaluation of cleaning effect, not only naked eye inspection, but also surface tension test and peel strength tests were performed. The results were quite good. The wire, which was exposed to corona discharge in the tubular electrode for 0.3–1.2 s, had better surface cleanness than that of wires treated with 1,1,1-TCE. This cleaning effect comes from the reactive oxygen ions generated in the plasma.
Aluminum magnet wire , Atmospheric Plasma , 1 , 1 , 1-TCE , Surface Cleaning