Orientation of Pearl Pigments Under High Magnetic Fields (2) Patterning of Pearl Pigments Using Magnetic Field Modulator

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  • 強磁場によるパール顔料の配向 (2) 磁気モジュレータによるパール顔料のパターニング
  • キョウジバ ニ ヨル パール ガンリョウ ノ ハイコウ 2 ジキ モジュレータ ニ ヨル パール ガンリョウ ノ パターニング

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Abstract

Patterning of nonmagnetic pearl pigments using magnetic field modulator composed of a ferromagnetic material and a nonmagnetic material was studied. Pearl pigments were dispersed in a UV resin and the dispersion was coated on a PET film. The coated film was set on a magnetic field modulator made of an etched stainless steel plate, and then exposed to a horizontal magnetic field (3 tesla) . The pearl pigments in the coating resin moved along the distribution of magnetic flux density induced by the magnetic field modulator. A pattern of the pigments was formed following the pattern of magnetic field modulator. The achieved pattern was fixed by UV curing. It was found by observation of a microscope and spectrum photometry that the manner of patterning depends on the magnetic susceptibility of the pigment composition. A new method proposed here for patterning pearl pigments is unique and will be applied to a print with design and to a watermark for anti-counterfeit.

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