| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent mingled sticky foreign materials from becoming very fine, and minimizing the selection of waste paper causing the increase of cost. SOLUTION: This method for producing a regenerated pulp by de-inking waste paper, and having each of the processes of disintegrating, maturing, float-selecting, cleaning and bleaching is characterized by treating the raw material waste paper with a de-inking chemical containing sodium hydroxide and a de-inking reagent in the de-inking process, and performing a first-half disintegration treatment, an immerse-treatment and a second-half disintegration treatment in a disintegration device, in which the three treatments are performed in 10-20 wt.% pulp concentration.</p> |
