和紙用のり (主として黄蜀葵) の研究

抄録

For making Japanese Style Paper, vegetable mucilage such as "Tororo-aoi", " Nori-asa" or "Ninori"is usuallyadded to obtain uniformpaper sheet. Mechanism of the uniformsheet formation property of mucilage is discussed principally on the standpoint of drainage of water.
Drainage time has been measured by using upper part of schopper's freeness tester. Three kinds of vegetable mucilage extracted from "Tororo-aoi" (Abelmoschus manihot medic), "Nori-asa" (artificial couple of "Tororo-aoi" and "Okura " Abelmoschus esculentus Moench made by prof.Kagawa) and "Ninori" (Hydragea paniculata sieb) have been studied.
Effects of the amounts and the kinds of vegetable mucilage, pulp consistency and temperature of water.
Drainage time increases according to the increase of the addition of vegetable mucilage or pulp consistency, and decreases by rising the temperature of water.
That is to say the drainage degree is the function of (1) the added amount of vegetable mucilage (2) pulp consistency (3) resistance of fiber layer (4) resistance of filtering material (5) beating degree of pulp, and the reverse function of (6) the temperature of water (7) filtering area (8) head difference in vat and (9) x (etc.) :
Drainage =Kφ {(the added amount of vegetable mucilage) (pulp consistency) (resistance of fiber layer) (resistance of filtering material) (beating degree of pulp) (the temp. of water) (filtering area) (head difference in vat) (x)}.
By using white water repeatedly, effect of vegetable mucilage and also drainage time decrease gradually. In the case of using white water repeatedely, the recovery percentage of available component of vegetable mucilage measured by the drainage time, is about by 20% "Tororo-aoi", by 40% "Nori-asa", and by 60% "Ninori ". The order of depression of viscocity of vegetable mucilage is as follows, "Tororo-aoi", " Nori-asa " and " Ninori ". Therefore in mill practice the percentage of recovery of available component of " Ninori " has become greater than the above mentioned data. This is the reason why the " Ninori " notwithstanding the mucilagious extract is smaller than "Tororo-aoi", is comparatively favourable in mill practice.