セルロースナノファイノ、、一調製技術の古紙•リサイクルパルプ繊維への応用

摘要

This paper first refers to the current situation of the paper industry in Japan, and explains the types of cellulose nanofibers (CNFs) and summary of their preparation methods, then introduces research examples where CNFs are prepared using wastepaper pulp fibers. Wastepaper-derived CNFs, which are currently published in academic journals, are CNFs which are obtained by hydrolyzing wastepaper with acid, and there are not any research examples of CNFs which are obtained by a mechanical treatment. This paper refers to the possibilities of the new sheet material, which we have recently studied, that is created in combination with the CNF preparation technique and recycled pulp fibers. Our preparation method of cellulose nanofibers is a wet mechanical method using aqueous counter collision. The sheets which were composed of fine fibers obtained from recycled pulp fibers by using the aqueous counter collision method, showed lower-density and high-strength characteristics. We believe it important to provide the pulp and paper industry with new business areas, where they are used for mass-produced products, in a rapidly developing IT society, by not only using the CNF preparation technique for preparing CNFs but also applying the technique to the pulp fiber modification technique.%日本製紙連合会の報告資料によれば，紙•板紙の内需は2000年まで緩やかな 成長を遂げおよそ3,200万tに達したが， リーマン•ショック後の2009年に大き く数量を落とし，それ以降もV字回復 することなく 2016年には2,700万t近 くまで低下したその減少量は約500 万tであり，2016年度のプラスチックス の国内の総生産量が約570万tである から，その数量の大きさを窺い知ること ができる.今後も，IT技術の発達，IoT 社会の推進によって，ますます紙•板紙 生産量の低下は進むものと予想され，製紙分野において新たな材料•素材の開発 または，紙•板紙の新たな利用用途の開拓が急務となっている.