The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 1997
Filed:
May. 04, 1995
Holger Engdahl, Savonlinna, FI;
Pekka Tormikoski, Savonlinna, FI;
Ahlstrom Machinery Oy, Helsinki, FI;
Abstract
A filtering method and apparatus pass the suspension (e.g. green liquor) to be filtered in a falling film down a first side of a filtering surface of a filter element at a different (higher) pressure than a second side, so that due to the pressure difference prevailing across the filtering surface the filtrate flows through the filtering surface and separated solids substantially remain in the suspension, without forming an undesirable solids layer on the filtering surface. A uniform liquid film falling on the filtering surface is generated by recirculating suspension from the bottom of the filter housing to an upper portion of the filter element. Nozzles may direct flow toward the filtering surface in localized areas. The method may be practiced continuously or in batches.