Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Volume 94, Issue 5
Displaying 1-4 of 4 articles from this issue
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Review
  • Kazuyuki TACHI
    2021 Volume 94 Issue 5 Pages 124-132
    Published: May 20, 2021
    Released on J-STAGE: May 27, 2021
    JOURNAL RESTRICTED ACCESS

    The surface profile of automotive topcoats, which affects the appearance such as orange peel and gloss, is determined by two mechanisms.

    The surface irregularity with wavelength of about 1-5 mm is formed on the paint film during spraying, since the volume of paint droplets deposited on the substrate is not uniform along the substrate surface. Though the irregularity is reduced during drying and baking, it does not disappear, resulting in the unevenness like orange peel.

    The irregularities of substrate surface, interface between wet film layers by wet-on-wet processing, and pigment distribution in the films are transcribed on the surface of top layer (clearcoat in many cases), resulting in the unevennesses with various wavelengths, after the top layer cannot flow along the substrate surface. It is because the irregularities make the shrinkage of the film thickness ununiform along the substrate surface.

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Serial Lecture
Serial Lecture
  • Dominique Kenshi NUMAKURA
    2021 Volume 94 Issue 5 Pages 140-146
    Published: May 20, 2021
    Released on J-STAGE: May 27, 2021
    JOURNAL RESTRICTED ACCESS

    The presence of flexible circuits in wearable electronics, especially medical devices, has been expanding. The thick film printing process has been becoming the key technology in this area. Advantages and disadvantages of the technology were evaluated comparing with traditional photolithography and etching process. The thick film printing process is able to generate functional circuits employing new unique materials. Several examples were introduced to show the mechanisms of the printed devices.

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