公开(公告)号：EP0929713B1

公开(公告)日：2001-07-18

申请号：EP97944016.1

申请日：1997-10-07

申请人： Ciba Specialty Chemicals Water Treatments Limited ,  SCA Graphic Research AB

发明人： CUTTS, Paul, Kenneth ,  GREEN, Matthew, James ,  DREHMER, Bo, Gunnar ,  ERIKSSON, Inger, Viktoria ,  JOHANSSON, Hans, Olov

IPC分类号： D21C5/02 ,  D21F1/66 ,  D21B1/32

CPC分类号： D21B1/325 ,  D21C5/02 ,  D21F1/66 ,  Y02W30/646 ,  Y02W30/648 ,  Y10S210/928

摘要： Cellulosic fines and cellulosic fibres are separated from a suspension containing the fines, the fibres and hydrophobic materials by screening the suspension to remove the fibres, and then subjecting the resultant filtrate to dispersed air flotation in the presence of calcium and generally a separation aid to form an upper Reject fraction in which the hydrophobic material is concentrated and a lower Accept fraction in which the cellulosic fines are concentrated.

公开(公告)号：EP0929713A1

公开(公告)日：1999-07-21

申请号：EP97944016.0

申请日：1997-10-07

申请人： Ciba Specialty Chemicals Water Treatments Limited ,  SCA Graphic Research AB

发明人： CUTTS, Paul, Kenneth ,  GREEN, Matthew, James ,  DREHMER, Bo, Gunnar ,  ERIKSSON, Inger, Viktoria ,  JOHANSSON, Hans, Olov

IPC分类号： D21B1 ,  D21C5 ,  D21F1

CPC分类号： D21B1/325 ,  D21C5/02 ,  D21F1/66 ,  Y02W30/646 ,  Y02W30/648 ,  Y10S210/928

摘要： Cellulosic fines and cellulosic fibres are separated from a suspension containing the fines, the fibres and hydrophobic materials by screening the suspension to remove the fibres, and then subjecting the resultant filtrate to dispersed air flotation in the presence of calcium and generally a separation aid to form an upper Reject fraction in which the hydrophobic material is concentrated and a lower Accept fraction in which the cellulosic fines are concentrated.

公开(公告)号：EP0711371B2

公开(公告)日：2007-08-22

申请号：EP95921014.7

申请日：1995-06-01

申请人： Ciba Specialty Chemicals Water Treatments Limited

发明人： CUTTS, Paul, Kenneth

IPC分类号： D21H23/76 ,  D21H17/44 ,  D21H17/42 ,  D21H17/68 ,  D21H21/10

CPC分类号： D21H23/765 ,  D21H17/42 ,  D21H17/44 ,  D21H17/68 ,  D21H21/10

摘要： Paper is made by forming a thick stock cellulosic suspension, flocculating the thick stock by adding a relatively high molecular weight and relatively low cationic charge density polymer, diluting the flocculated thick stock to form a thin stock and then draining the thin stock to form a sheet. Usually coagulant is added to the thin stock before drainage and best results are achieved by adding coagulant followed by anionic colloidal material such as bentonite. The process can be operated to give good retention and good formation and, if the thick stock is dirty, to minimise pitch problems.

公开(公告)号：EP0711371B1

公开(公告)日：2001-08-29

申请号：EP95921014.7

申请日：1995-06-01

申请人： Ciba Specialty Chemicals Water Treatments Limited

发明人： CUTTS, Paul, Kenneth

IPC分类号： D21H23/76 ,  D21H17/44 ,  D21H17/42 ,  D21H17/68 ,  D21H21/10

CPC分类号： D21H23/765 ,  D21H17/42 ,  D21H17/44 ,  D21H17/68 ,  D21H21/10

摘要： Paper is made by forming a thick stock cellulosic suspension, flocculating the thick stock by adding a relatively high molecular weight and relatively low cationic charge density polymer, diluting the flocculated thick stock to form a thin stock and then draining the thin stock to form a sheet. Usually coagulant is added to the thin stock before drainage and best results are achieved by adding coagulant followed by anionic colloidal material such as bentonite. The process can be operated to give good retention and good formation and, if the thick stock is dirty, to minimise pitch problems.