| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain regenerated pulp having slight foreign matters and high whiteness by efficiently removing foreign matters such as ink, stuck materials and colored materials, etc., from pulp in a regenerating treatment of waste paper. SOLUTION: In a regeneration treatment of waste paper, waste paper-treating processes such as defiberizing.deinking and further bleaching by using an enzyme in which a ratio of (alkali lipase activity/alkali cellulose) is adjusted to (100/1) to (1-10) to the waste paper are performed in at least one stage of following processes; a defiberizing process to add an enzyme at defiberizing time and treating with the enzyme, a treating process to provide an enzyme- treating stage after defiberizing of the waste paper, a deinking process to add the enzyme at the time of kneading in deinking and treat with the enzyme, a treating process to provide an enzyme-treating stage before a bleaching process of the waste paper, and a bleaching process to add the enzyme at the time of kneading in bleaching and treating with the enzyme.</p> |
