| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To produce a deinked pulp having low ash content by remarkably improving a deliming property in a washing step in a deinking method for printed waste paper having high ash content. <P>SOLUTION: The method for producing the deinked pulp comprises carrying out additional treatment of at least one kind of dispersing agent selected from a dialkyl sulfosuccinate, a polyacrylate, a polycarboxylate, a quaternary ammonium salt type cationic polymer and a sulfonic group-modified polyvinyl alcohol in a disintegrating step (A) for disintegrating printed waste paper having high ash content and containing ash content in an amount of 15.0-35.0mass% based on total solid content and reducing the ash in the pulp in a washing step (C) of a post-process. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
