2023 Volume 62 Issue 5 Pages 450-456
In this study, non-destructive penetration area measurements were performed using X-ray CT (computed tomography) to elucidate the penetration behavior of pigment ink. Using an ink in which silver particles were added as pigment particles to a solution of propylene glycol mixed with a cesium iodide solution, we were able to measure the ink penetration area and the pigment particle deposition area using X-ray CT, and observed the penetration behavior of pigment inks on plain and coated paper. In particular, we examined the effect of the presence or absence of pigment particles on ink penetration. As a result, no change in the penetration area was observed on plain paper with or without pigment particles. On coated paper, however, the pigment particles penetrate into the coated layer and fill the voids in the coated layer, suppressing ink penetration and reducing the horizontal and vertical penetration areas.
