EP 1052327 B1 20040721 - White water circuit and process for the circulation of water in a papermachine
Title (en)
White water circuit and process for the circulation of water in a papermachine
Title (de)
Siebwasserkreislauf und Verfahren zur Wasserzirkulation einer Papiermaschine
Title (fr)
Circuit d' eau blanche et procédé de circulation de l' eau dans une machine à papier
Publication
Application
Priority
DE 19922391 A 19990514
Abstract (en)
[origin: EP1052327A1] The water circuit system, at the fourdrinier section of a papermaking machine, is linked to an applicator where a mass is applied to the wet paper web containing a pigment and/or filling materials. An initial water circuit is fed exclusively by the sections (2.1,2.2) which extract water from the wet web in the web production process, before the wet web is coated with a mass. Part of the extracted water, in a second water circuit, is used to feed the web applicator, and the remainder is cleaned of contained matter pref. in a micro-filtration station (7). A thickening stage (6) is in front of the micro-filtration unit (7). P of the water for the applicator is taken from the overflow at the thickening stage (6) and/or from the micro-filter (7). An Independent claim is included for the operation of a water circuit at the fourdrinier section of a papermaking machine, where only water which is wholly clean of pigments and/or filling materials is returned to the stock inlet (1). Preferred Features: Only water which carries pigments and/or filling materials is passed to the applicator. Unused water, w carries matter, is cleaned by micro-filtration (7) after thickening (6) to give a clear water output.
IPC 1-7
IPC 8 full level
D21F 1/66 (2006.01); D21H 23/28 (2006.01)
CPC (source: EP US)
D21F 1/66 (2013.01 - EP US); D21H 23/28 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE FI SE
DOCDB simple family (publication)
EP 1052327 A1 20001115; EP 1052327 B1 20040721; AT E271627 T1 20040815; DE 19922391 A1 20001116; DE 50007102 D1 20040826; US 6497788 B1 20021224
DOCDB simple family (application)
EP 00108222 A 20000414; AT 00108222 T 20000414; DE 19922391 A 19990514; DE 50007102 T 20000414; US 57037600 A 20000512