J. Technology and Education, Vol.22, No.2, pp.41–48(2015)




上嶋 晃智1、後反 克典1、大堂 充2、小泉 貞之1

1福井工業高等専門学校 (916-8507鯖江市下司町)

2KBセーレン株式会社 (530-0001大阪市北区梅田3310 梅田ダイビル)



Study on viscous material used for Japanese paper production and preservation

Akinori UEJIMA1, Katsunori GOTAN1, Mitsuru ODO2 and Sadayuki KOIZUMI1,

National Institute of Technology, Fukui College, Geshi-cho, Sabae-shi, Fukui 916-8507

KB Seiren Co. LTD, 3-3-10, Dai Umeda Building, Umeda, Kita-ku, Osaka-shi, Osaka 530-0001


(Received November 2, 2015; Accepted December 1, 2015)


Since early times, Japanese paper has been made by using the rind of plants such as paper mulberry and mitsumata and by uniformly scattering these fibrous raw materials over hibiscus extract. The hibiscus extract is sticky and has been used as a dispersant of the paper fiber material. Unfortunately, in the process of manufacturing Japanese paper, the viscosity of this hibiscus extract decreases. In addition, because cresol used for the preservation of this hibiscus is industrial waste, discarding cresol into the natural environment was considered to cause environmental degradation.

 In this study, we investigated causative factors of the viscosity drop of hibiscus extract used in Japanese paper production. Using a viscosimeter on the hibiscus extract that filled the acrylic pipe with glass beads, the viscosimetry of the hibiscus extract was determined, and the deterioration of the extracting solution was examined for heat and metal ions.

Key words: Japanese paper, Hibiscus extract, Cresol, Viscosimeter, Preservation