Rewritable Paper Utilizing Kapok Fibers Containing Thermo-sensitive Inks

Abstract

We have succeeded to make paper sheets integrating hollow Kapok fibers containing solid fluorescence particles or magnetic particles. The focus of this work is to develop a novel paper sheet which integrates Kapok fibers containing thermo-sensitive inks. We utilized a thermo-sensitive ink which exhibits blue color under 40°C and pink color over 40°C. We have succeeded to make Kapok fibers containing the thermo-sensitive ink and paper sheet integrating the Kapok fibers. The paper sheet which integrates Kapok fibers containing thermo-sensitive inks changed its color reversibly depending on temperature. This observation suggests that the paper sheet utilizing Kapok fibers has the potential for rewritable paper sheet.