Rheological Studies on Curing Behavior of UV Inks (II)

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  • OTSUBO Yasufumi
    Department of Image Science and Technology, Faculty of Engineering, Chiba University
  • AMARI Takeshi
    Department of Image Science and Technology, Faculty of Engineering, Chiba University
  • WATANABE Koichiro
    Department of Image Science and Technology, Faculty of Engineering, Chiba University

Bibliographic Information

Other Title
  • UVインキの硬化挙動に関するレオロジー的研究 (第II報)
  • UVインキの硬化挙動に関するレオロジー的研究-2-硬化速度と吸光係数との関係
  • UV インキ ノ コウカ キョドウ ニ カンスル レオロジーテキ ケンキュウ
  • 硬化速度と吸光係数との関係
  • Relationship between Cure Rate and Absorption Coefficient

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Description

The dynamic viscosity of UV inks during curing was measured by the use of an oscillating plate rheometer. Since logarithmic plots of the dynamic viscosity against exposure energy are closely related by two straight lines, the minimum exposure energy defined as the exposure energy at the intersection of two lines is adopted to evaluate the cure rate. On exposure to a monochromatic light of 365 nm, the minimum exposure energy exponentially increases with film thickness. This is attributed to an exponential decay of the light intensity with depth in the film. Therefore, the absorption coefficient can be rheologically determined. The UV curability on direct exposure to UV lamp is predicted from the spectral sensitivity of the vehicle and the viscosity data obtained during curing under 365 nm light. The model calculation shows a good agreement with the experimental results.

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