EP 0955405 A1 19991110 - Totally submerged pressurized pulp washer and method of operation thereof
Title (en)
Totally submerged pressurized pulp washer and method of operation thereof
Title (de)
Vollständig eingetauchter, unter Druck stehender Zellstoffwäscher und Verfahren zu dessen Betrieb
Title (fr)
Laveur de pâte à papier pressurisé et complètement submergé, et son procédé d'utilisation
Publication
Application
Priority
US 7289298 A 19980505
Abstract (en)
A pulp mat is formed on a surface of a permeable rotating drum (107) disposed in a pressurized liquid filled washing apparatus (101). Pressurized washing liquid (111) is delivered under the force of gravity or a hydrostatic head from a wash liquid reservoir (112). The wash liquid reservoir includes both wash liquid and gas (113) supplied from a filtrate reservoir. The gas/liquid interface in the wash liquid reservoir is hydraulically disposed above the top of the washer vat (102) to thereby provide a hydrostatic head between the wash liquid reservoir and the washer vat. The interface is monitored and used to control the speed of the rotating drum. In the event the gas/liquid interface rises above a predetermined optimum value for the current operating speed of the drum, the speed of the drum is increased in order to avoid mat collapse and optimize washing efficiency. In the event the gas/liquid interface drops below a predetermined optimum level, the speed of the drum is reduced to increase washing efficiency. <IMAGE>
IPC 1-7
IPC 8 full level
D21C 9/06 (2006.01)
CPC (source: EP)
D21C 9/06 (2013.01)
Citation (search report)
- [A] US 2805773 A 19570910 - MECKLIN ROBERT W, et al
- [A] DE 4428515 A1 19960314 - HIRSCHMANN SIEGFRIED [DE]
- [A] WO 9010750 A1 19900920 - GREEN BAY PACKAGING INC [US]
- [A] WO 9308518 A1 19930429 - INGERSOLL RAND CO [US]
- [DA] US 4827741 A 19890509 - LUTHI OSCAR [US]
Designated contracting state (EPC)
AT DE ES FI SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 99630042 A 19990430; CA 2270382 A 19990428