EP 1373637 A1 20040102 - METHOD FOR PRODUCING A SHEET OF PAPER COMPRISING CALCITE
Title (en)
METHOD FOR PRODUCING A SHEET OF PAPER COMPRISING CALCITE
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER CALCIT ENTHALTENDEN PAPIERBAHN
Title (fr)
PROCEDE D'OBTENTION D'UNE FEUILLE PAPETIERE COMPORTANT DE LA CALCITE
Publication
Application
Priority
- FR 0200574 W 20020214
- FR 0102186 A 20010216
Abstract (en)
[origin: FR2821095A1] The invention relates to a method for producing a sheet of paper (6) comprising paper fibres and calcium carbonate mainly in the form of calcite crystals linked directly to the paper fibres. The inventive method is characterised in that it comprises the following steps: - (i) an aqueous composition comprising calcium bicarbonates (5) and/or hydrated and/or dissolved carbon dioxide (3) and (ii) an aqueous composition comprising calcium hydroxide (4) are mixed in an aqueous medium in such a way as to precipitate the calcium carbonate in the form of vaterite crystals; - paper fibres (2, 2') are immediately added; - the vaterite crystals are left to transform into calcite crystals on contact with the fibres; - said mixture containing the calcite crystals which are fixed to the fibres is subsequently sent on the conveying wire of the papermaking machine (M) for drainage and so that the sheet of paper can be formed; - the sheet of paper (6) thus obtained is treated, if necessary, and dried.
IPC 1-7
IPC 8 full level
D21H 17/70 (2006.01); D21H 17/67 (2006.01)
CPC (source: EP US)
D21H 17/70 (2013.01 - EP US); D21H 17/675 (2013.01 - EP US)
Citation (search report)
See references of WO 02066735A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
FR 2821095 A1 20020823; FR 2821095 B1 20030411; AR 032698 A1 20031119; EP 1373637 A1 20040102; US 2004118542 A1 20040624; US 7504000 B2 20090317; WO 02066735 A1 20020829
DOCDB simple family (application)
FR 0102186 A 20010216; AR P020100519 A 20020215; EP 02706858 A 20020214; FR 0200574 W 20020214; US 46746104 A 20040120