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:
Mar. 05, 2024
Filed:
Jun. 14, 2019
Valmet Ab, Sundsvall, SE;
Francois Lambert, Sundsvall, SE;
VALMET AB, Sundsvall, SE;
Abstract
A screw feeder includes a pipe, feed screw, rotatory shaft, dewatering holes, anti-rotation bars extending inside the pipe and protruding towards the feed screw, an inlet to receive solid-liquid mixture, and an outlet to discharge partially dewatered solid. The pipe includes at least one pipe section having a first peripheral zone in a vertically lower area with dewatering holes but no anti-rotation bars and a second peripheral zone in a vertically upper area with anti-rotation bars. A pipe profile includes two differently shaped profiles, a first and second pipe profile are selected from a square-shaped, partly circular, and a partly elliptically-shaped profile. The first pipe profile is selected to enable outer edges of the feed screw to remove material overlying the dewatering holes, and the second pipe profile is selected to prohibit contact between the outer edges of the feed screw and the anti-rotation bars.