公开(公告)号：EP2135991B1

公开(公告)日：2017-02-22

申请号：EP08722607.2

申请日：2008-03-21

申请人： Nippon Paper Industries Co., Ltd.

发明人： YUZAWA, Chie ,  IWABUCHI, Hisashi ,  KAMIJO, Yasuyuki ,  GOTO, Shisei ,  IIMORI, Takeshi

IPC分类号： D21C5/02

CPC分类号： D21C5/025 ,  Y02W30/648

公开(公告)号：EP2135991A1

公开(公告)日：2009-12-23

申请号：EP08722607.2

申请日：2008-03-21

申请人： Nippon Paper Industries Co., Ltd.

发明人： YUZAWA, Chie ,  IWABUCHI, Hisashi ,  KAMIJO, Yasuyuki ,  GOTO, Shisei ,  IIMORI, Takeshi

IPC分类号： D21C5/02

CPC分类号： D21C5/025 ,  Y02W30/648

摘要： The object of the present invention is to provide a process for producing deinked pulp from recovered paper containing stickies while preventing excessive reduction in the size of stickies, lowering the COD of effluents, and producing deinked pulp with a smaller residual ink content.
In the ink detachment stage of the process for producing deinked pulp from recovered paper containing stickies, an anhydride of crystalline layered silicate is added, preferably in an amount of 0.1-1.5 weight% of absolute-dry pulp, and a deinking treatment is performed at a pH of 7.0-9.9. In the present invention, the deinking treatment is performed in a weakly alkaline to neutral region which is generally said to be effective in reducing the amount of stickies but less effective in ink detachment and, yet, deinked pulp having a smaller amount of residual ink can be produced.