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:
May. 22, 2001
Filed:
Dec. 07, 1999
Sven Liin, Kungsängen, SE;
Cellwood Machinery AB, Nassjo, CH;
Abstract
A pulper includes a rotor (,) mounted in a tube adjacent to a screening plate (,) having holes (,). The rotor (,) includes helical vanes (,) whose diameter decreases towards the outer end of the rotor. The rotor vanes (,) carry in the vicinity of the screening plate a radially and outwardly projecting shoulder-like element (,) having a leading surface (,) which is generally flat and inclined relative to the screening plate (,) at an angle of 55°-85°, and a trailing part having a reversed wing-profile shape as seen in the direction of rotation. The element forms a pressure-generating and subpressure-generating device which exerts an alternating effect on the pulp as the rotor rotates, therewith counteracting clogging of the holes (,) in the screening plate. The shoulder-like element (,) may comprise a completely or partially separate element in relation to the rotor, and may be detachable therefrom and replaceable, and also optionally reversible.