Drying process of an ink-dot analyzed using both digital holographic microscopy and tackiness measurement

摘要

This paper proposes a novel method to investigate the property of a tiny ink dot in its drying process from its gelation to solidification using digital holographic microscopy and tackiness measurement. The method can analyze a variation of an ink dot having a diameter of a few hundred micrometers by using temporal variations of volume, height and contact angle of the ink dot calculated from reconstructed complex amplitudes of the light transmitted through the ink dot. In addition, the tackiness of the ink dot is evaluated using a handmade measurement device having a micro cantilever as the sensing probe. The experimental results using a commercially available water-based magenta ink ejected on a glass plate are presented.