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 Orientation of Pearl Pigments Under High Magnetic Fields(2) : Patterning of Pearl Pigments Using Magnetic Field Modulator
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.
日本印刷学会誌 45(1), 27-32, 2008-02-29
The Japanese Society of Printing Science and Technology