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:
Nov. 14, 1989
Filed:
Jun. 11, 1987
Frey Frejborg, Glens Falls, NY (US);
A. Ahlstrom Corporation, Noormarkku, FI;
Abstract
The pulp screening apparatus comprises a housing having an inlet for allowing fibrous stock to be introduced into the interior, a first outlet for allowing the accept screened stock to be removed, a second outlet for the reject, a screen having a contour surface within the housing, a rotor moving in the vicinity of the screen at a predetermined speed and forming together with the screen an annular screening chamber. The rotor has at least the surface facing the screen partially contoured and is provided with a plurality of perforations along at least a portion of the length of the screening chamber to allow fibrous stock to be introduced into the screening chamber and to prevent the undesired debris of the stock from entering the chamber. Both sides of the rotor may have a contoured surface with grooves.