EP 0215044 B1 19900606 - METHOD FOR PREPARING A FIBROUS SHEET BY USING PAPER MANUFACTURING TECHNIQUES
Title (en)
METHOD FOR PREPARING A FIBROUS SHEET BY USING PAPER MANUFACTURING TECHNIQUES
Publication
Application
Priority
FR 8503947 A 19850318
Abstract (en)
[origin: FR2578870A1] New method for the preparation of a fibrous sheet by using paper manufacturing techniques in order to improve the retention and particularly the opacity, said method being characterized in that 1) an aqueous suspension of fibrous is prepared; 2) an aqueous suspension of mineral filler and binder is prepared wherein the filler/binder mixture is preflocculated by means of a cationic flocculent; 3) at the head circuits of the paper machine and before the head box of the latter, the aqueous suspension of the preflocculated filler-binder mixture is introduced into the aqueous suspension of fibers so that (i) the average diameter of the flocks of the filler-binder mixture added into said fiber suspension is comprised between 0.01 and 0.3mm, and (ii) the contact duration of said filler-binder mixture with the fibers in the resultant suspension is comprised between 10 and 60 seconds; 4) before the heat box, a cationic flocculent is introduced into the aqueous suspension of the mixture of fibers-filler-binder obtained in the stage (3), so that the contact duration of said floculent with the mixture of fibers-filler-binder is shorter than 45 seconds; 5) the resulting aqueous suspension is introduced into the head box and forms a sheet on a paper machine which is pressed and dried.
IPC 1-7
IPC 8 full level
D21H 11/00 (2006.01); D21F 11/00 (2006.01); D21H 17/37 (2006.01); D21H 17/45 (2006.01); D21H 17/55 (2006.01); D21H 17/56 (2006.01); D21H 17/63 (2006.01); D21H 23/10 (2006.01); D21H 23/76 (2006.01)
CPC (source: EP)
D21F 11/00 (2013.01); D21H 17/375 (2013.01); D21H 17/455 (2013.01); D21H 17/55 (2013.01); D21H 17/56 (2013.01); D21H 23/10 (2013.01); D21H 23/765 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
FR 2578870 A1 19860919; FR 2578870 B1 19880729; DE 3671767 D1 19900712; EP 0215044 A1 19870325; EP 0215044 B1 19900606; ES 553296 A0 19871201; ES 8801009 A1 19871201; FI 81157 B 19900531; FI 81157 C 19900910; FI 864653 A0 19861114; FI 864653 A 19861114; JP S62502696 A 19871015; WO 8605530 A1 19860925
DOCDB simple family (application)
FR 8503947 A 19850318; DE 3671767 T 19860307; EP 86901427 A 19860307; ES 553296 A 19860312; FI 864653 A 19861114; FR 8600073 W 19860307; JP 50145586 A 19860307