紙における墨のにじみとクレム吸水度試験に基づくその評価法の提案

摘要

Three perspectives were devised to characterize Chinese ink blurring, namely the ink absorption, the unevenness of the rrnoutlines at the blurring heads, and the difference of the tones at the blurring heads. Laboratory handsheets from softwood rrnkraft pulp, having various basis weights, were prepared with or without wet pressing. They were soaked in Chinese ink for rrnvarious times as the Klemm method. After drying, they were scanned by an image scanner set at 800 dpi to prepared bit-mapped rrnimages. These images were changed to binary images. Using the obtained images, various blurring indices based on the three rrnperspectives were introduced. The blurring indices based on the ink absorption, the adsorbed ink amount and the capillary rrnrise, for the handsheets without wet pressing were larger than those for the handsheets with wet pressing. Other blurring rrnindices showed few differences between these papers with or without wet pressing. Thus, the three perspectives have different rrncharacter in blots evaluation.%以上の実験から，湿圧せずに乾燥した密度の小さい紙，rnもしくは坪量の小さい紙を一定時間浸漬させた場合に『墨rn液吸収量』と『浸透距離の最大値?平均値?最小値』がrn増加し，『浸透量』という観点からにじみやすいと評価しrnた．しかし，紙の密度，坪量，F?W 面，及び浸漬時間はrn『輪郭線の凹凸』と『墨色の濃淡』に影響を与えるとはrnいえなかった．