Holopulp Elements of Rice Straw in Relation to Their Papermaking Properties

Abstract

The characteristics of holopulp elements from rice straw were studied to obtain fundamental knowledge related to their papermaking properties. Various methods to prepare rice straw holopulp were examined, and the chlorite-sodium hydroxide method was found to be most suitable. In this method the sodium hydroxide treatment was very effective for defibration and desilication. The classification of holopulp to separate the fiber elements from the non-fiber elements was achieved successfully. Although rice straw contains a considerable amount of fines elements, the fiber elements have much higher slenderness ratio and are slightly shorter than those of hardwood fibers

製紙特性に関連する基礎的な知見を得るため, イネワラのホロパルプ構成要素の特徴について検討を行った。イネワラからホロパルプを調製する方法について検討し, 亜塩素酸 - 水酸化ナトリウム法が適当と推定されたが, この過程でアルカリ処理が解繊と脱シリカに非常に有効であることがわかった。ふるい分け試験により繊維要素の分離に成功した。また, イネワラには多量の非繊維要素が含まれているが, その繊維は広葉樹よりやや短く, 幅に対する長さの比が大きいことを確認した。