Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1998-04-22
1999-09-14
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241296, B02C 712
Patent
active
059509465
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to refining elements for use in refiners of the disk type for lump-shaped, preferably lignocellulosic material, which refiner includes relatively rotatable refining elements, which form a refiner gap therebetween. The present invention further relates to such refining elements in which the outer portion of the refiner gap, spaced from the center of rotation, is angular in relation to the radial plane, so that it extends to a substantial degree in the axial direction.
BACKGROUND OF THE INVENTION
A particularly important field of application for the present invention is in connection with refiners for making fiber- or papermaking pulp from wood chips or similar cellulosic material. Refiners of the disk type are formed with a refiner gap extending in the radial direction between the refining elements, which gap starts from a central feed zone for the raw material where the centrifugal force is relatively low. The centrifugal force affecting the material to be refined therein increases very strongly with increasing radius. In order to prolong the dwell time in the outer portion of the refiner gap, the outer portion thereof can be formed so as to extend angularly in relation to the radial direction, so that only part of the centrifugal force is permitted to affect the material to be refined in the flow direction of the refiner gap. While steps have thus been taken in order to limit the flow rate of the material to be refined in the radially or outer portion of the refiner gap in connection with this design the effect of the centrifugal force in the central feed zone is low, so that the feed to the outer angular portion of the refiner gap is not as intense as would be desired in order to achieve the maximum capacity of the refiner. Attempts have been made to introduce mechanical devices to promote the discharge in the central feed zone, which, however, are not effective, because, inter alia, they must be exchanged relatively often due to their rapid wear.
An object of the present invention is to eliminate these problems and thereby bring about effective feed of the material to be refined from the inner radial portion of the refining zone to the outer angular portion.
SUMMARY OF THE INVENTION
This and other objects of the present invention have now been achieved by the discovery of apparatus for refining lignocellulose material which comprises a first stationary refiner disk, a second rotatable refiner disk rotatably mounted adjacent to the first stationary refiner disk on a rotatable shaft whereby a refining gap is created between the first and second refiner disks, the first stationary refiner disk including an inner substantially radial portion and an outer angular portion, and a second rotatable refiner disk including an inner substantially radial portion and an outer angular portion, whereby the refining gap includes an inner radial refining gap portion and an outer angular refining gap portion angularly disposed with respect to the inner radial refining gap portion in the direction facing away from the inner radial refining gap towards the direction of rotation of the refiner shaft, a first refiner element mounted on the outer angular portion of the first refiner disk, and a second refiner element mounted on the outer angular portion of the second refining disk, thereby defining the outer angular refining gap portion therebetween, the second refiner element including at least one wing member projecting from the second refiner element adjacent to the inner radial refining gap, and the first refiner element including an inlet portion juxtaposed with the wing member of the second refiner element, the inner portion including a concave surface, whereby the lignocellulose material is thrown against the concave surface during its transition from the inner radial refining gap portion to the outer angular refining gap portion.
In accordance with one embodiment of the apparatus of the present invention, the wing member includes an outer surface having a curv
REFERENCES:
patent: 4253613 (1981-03-01), Reinhall
Kjellqvist Olof
Nastren Christer
Rosenbaum Mark
Sunds Defibrator Industries AB
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