ATBECHDEDKESFRGBGRITLILUNLSEMCPTIE......FI......................................JDIM360 (Ver 1.5 21 Nov 2005) - 1100000/00838550EUROPEAN PATENT APPLICATIONA319990804EP97308439.519971023enenen738450 19961025US19990804199931199804291998186 6D 21H 23/04 A 6D 21H 21/10 B 6D 21H 17:01 Z // D21H17:01deVerfahren zum Retensionsmittelzusatz für verbesserte PappeherstellungenMethod of retention aid addition for improved paper board productionfrProcédé d'addition d'agent de rétention pour améliorer la fabrication de cartonNALCO CHEMICAL COMPANY00564151DCH/FP5654371One Nalco CenterNaperville Illinois 60563-1198USSurface, Thomas G.9300 Squirrel Tree CourtChesterfield, VA 23838USNoe, Jeffrey S.2974 Dupler PlaceMillersport, OH 43046USWeatherman, David J.1464 Weinhold WayClaremore, OK 74017USHarrison, David Christopheret al00031532MEWBURN ELLIS York House 23 KingswayLondon WC2B 6HPGBATBECHDEDKESFIFRGBGRIEITLILUMCNLPTSE19990804199931

The present invention relates to a method for manufacturing paper board which contains no inorganic filler. Pulp fines from the white water system and retention agents are mixed and then fed to the stock upstream of the paper machine prior to blending with the long fiber stock. Once flocculation takes place, the stock is drained to form a sheet and the sheet is dried.