Search International and National Patent Collections

1. (WO1998049389) A PULPING APPARATUS

Pub. No.:    WO/1998/049389    International Application No.:    PCT/SE1998/000756
Publication Date: Fri Nov 06 00:59:59 CET 1998 International Filing Date: Sat Apr 25 01:59:59 CEST 1998
IPC: D21B 1/34
Applicants: CELLWOOD MACHINERY AB
LIIN, Sven
Inventors: LIIN, Sven
Title: A PULPING APPARATUS
Abstract:
A pulper comprises a rotor (5) mounted in a tub adjacent to a screening plate (4) having holes (4a). The rotor (5) includes helical vanes (5a) whose diameter decreases towards the outer end of the rotor. The rotor vanes (5a) carry in the vicinity of the screening plate a radially and outwardly projecting shoulder-like element (10) having a leading surface (10b) which is generally flat and inclined relative to the screening plate (4) 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 means which exerts an alternating effect on the pulp as the rotor rotates, therewith counteracting clogging of the holes (4a) in the screening plate. The shoulder-like element (10) may comprise a completely or partially separate element in relation to the rotor, and may be detachable therefrom and replaceable, and also optionally reversible.