Application of pulsed power technology to recycling of metal-coated plastic

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23525
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Kagawa National College of Technology
• Principal Investigator: Yamashita Tomohiko 香川高等専門学校, 機械電子工学科, 助教 (20846109)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: パルスパワー / 放電 / 衝撃波 / 金属被覆プラスチック / 金属剥離 / リサイクル

Outline of Final Research Achievements

This study has focused on a phenomenon of metal removal from metal-coated plastic using pulsed power technology from the viewpoint of valuable resource recovery. In this study, to expand the application of metal removal treatment, a DVD-R with the pretreated to expose a metal layer was used as the treatment target. An out-sided and center electrode (OCE) arrangement with an air gap between the electrodes and metal layer was employed. The influence of the air gap on the metal removal was examined and discussed mainly based on the voltage/current waveforms. The state of discharge and the shockwave were also observed with the high-speed camera and the Schlieren system. As a result, it was revealed that the metal is effectively removed from the DVD-R by providing an air gap between the electrodes and the metal layer.

Free Research Field

高電圧パルスパワー工学

Academic Significance and Societal Importance of the Research Achievements

本研究では，パルスパワー技術を用いた金属剥離処理の電気電子機器筐体などへの適用拡大を目的として，金属層が露出している金属被覆プラスチックからの金属剥離について研究を行った。パルス放電によって金属層が露出した金属被覆プラスチックを処理する場合は，電極と金属層との間に空隙を設けることで金属が効果的に剥離されることが明らかとなった。このことは，パルス放電を用いた金属剥離処理の実用化に向けて，非常に重要な知見である。さらに，金属剥離処理中に発生する放電および衝撃波の様子を撮影した。それらは，極めて薄い金属薄膜の蒸発を伴う放電現象の解明および衝撃波の効果的利用にも役立つと考えられる。