| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide high-quality book printing paper having excellent smoothness in spite of bulkiness, slightly deteriorating tearing strength and stiffness with a small amount of impurities and having high whiteness and excellent offset printability though DIP (de-inked pulp) is highly compounded and to provide the book printing paper having the excellent smoothness in spite of the bulkiness, slightly deteriorating the stiffness and having excellent offset printability. <P>SOLUTION: The DIP prepared by generating bubbles according cavitation, bringing the bubbles into contact with a waste paper pulp suspension and treating the pulp suspension is used as a pulp raw material for the book printing paper. The book printing paper is prepared as follows. The pulp obtained by generating the bubbles according to the cavitation, bringing the bubbles into contact with the pulp suspension, treating the pulp suspension and having the regulated freeness of the pulp is used as the pulp raw material for the book printing paper. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
