Masayuki Araya, Toshifumi Yuji, Tsuneo Watanabe, Junzou Kashihara, Yoshitake Sumida

Application to cleaning of waste plastic surfaces using atmospheric non-thermal plasma jets

Thin Solid Films 515 (2007) 4301-4307

The removal of paint on the surface of waste plastics is difficult by the conventional process; in this research, a new cleaning mechanism using atmospheric plasmas was examined through optical emission spectroscopy, electron spectroscopy for chemical analysis, and scanning electron microscopy. Results indicate that an increase of pulse frequency enables for a short processing time for the removal of the paint film, signifying that the production of radicals in plasma, especially oxygen radicals, can be controlled by pulse frequency. Plasma jets were generated under the experimental conditions of an input power of 250 W to 400 W, a pulse frequency of 2kHz to 12kHz, and a plasma gas flow rate of 3 0 L/min. Examination of the intensity ratio of the reactive species, as measured by emission spectroscopy, showed that the O/N value increased with an increase in pulse frequency. Results of analysis with electron spectroscopy for chemical analysis show that nitrogen atoms and molybdenum in only the paint film decreased through plasma processing. (c) 2006 Elsevier B.V. All rights reserved.

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