Penetration of Induction-Charged Particles into an Adhesive Material Layer and their Film Formation.

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  • OHKUBO YUTAKA
    Research and Development Division, NKK CORPORATION Measurement and Diagnosis Division, KKS CORPORATION
  • TAKAHASHI YOSHIKI
    Research and Development Division, NKK CORPORATION Information System Department, NKK CORPORATION

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  • 誘導帯電粒子群の電極板上接着剤層中への侵入挙動と皮膜形成
  • ユウドウ タイデン リュウシグン ノ デンキョクバンジョウ セッチャクザイソウ

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Abstract

Penetration of induction-charged particles, through a field with horizontally set parallel plate electrodes, into an adhesion layer on the lower surface of an upper electrode and their film formation are investigated by an experimental approach, using polyurethane, alumna, and silica powders.<BR>The results of the experiment on powder coated film thickness are explained on the basis of ratio of thickness of adhesive material layer to particle diameter. In a thin film of adhesive material, powder-coated film thickness equals particle diameter. In a medium film thickness of adhesive material, powder-coated film thickness after drying is dominated linearly by initial wet film thickness of the adhesive material. High electric fields give high particle penetration speeds and fix them securaly in the adhesive material layer. The effect of particle diameter on dry film thickness is not observed. Particles, having diamond-like shape, are vertical in the adhesive material surface and horizontal on the bottom of the film. When first supplying high voltage, the amount of powder attaching on the adhesion surface increases exponentially. Thereafter, the amount of particle penetrating the film is proportionate to the square root of time. In a thick adhesive material layer, particles can not arrive at the electrode by a certain time due to a high viscosity of adhesion.

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