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:
Jun. 12, 2007
Filed:
Oct. 22, 2003
Antero Laine, Kotka, FI;
Risto Ljokkoi, Karhula, FI;
Olavi Pikka, Karhula, FI;
Sami Siik, Kymi, FI;
Harri Qvintus, Glens Falls, NY (US);
Antero Laine, Kotka, FI;
Risto Ljokkoi, Karhula, FI;
Olavi Pikka, Karhula, FI;
Sami Siik, Kymi, FI;
Harri Qvintus, Glens Falls, NY (US);
Andritz-Ahlstrom Oy, Helsinki, FI;
Abstract
The present invention relates to the thickening of pulp suspensions. A low consistency pulp suspension is fed to a pre-thickener () through an inlet conduit (). A layer of thickened pulp, formed on a filter surface (), is pushed along the filter surface by a cleaning member to the discharge end of the pre-thickener and is discharged through the outlet (). The cleaning member comprises a rotating shaft (), on which shaft at least one screw thread () is fixed so as to leave a free space between the shaft and the screw thread. Essentially non-thickened pulp is allowed to flow through the apparatus via this space.