Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1991-03-18
1994-10-11
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
241293, B02C 1900
Patent
active
053540050
DESCRIPTION:
BRIEF SUMMARY
The invention relates to grinding equipment for a Jordan refiner for grinding paper pulp, comprising: of which bar-shaped knives are arranged at predetermined angles with respect to the conical shell generating lines, and surface of which bar-shaped knives are arranged at predetermined angles with respect to the conical shell generating lines.
In known embodiments of such Jordan refiner equipment, the knives are arranged in the rotating as well as the stationary part over the entire grinding surface, i.e. from the inlet to the outlet, formed of the same material, and, at least substantially, with the same arrangement.
From U.S. Pat. No. 2,776,800, a disk refiner comprising an additional suction chamber and air vanes became known in which several grinding zones are provided, although the knives in the pre-grinding zone are not arranged at an angle to the radia and the knives in the further zones are not arranged consecutively at an angle to the radia, but at various positive and negative angles to the radia.
U.S. Pat. No. 2,694,344 shows an extremely steep Jordan refiner comprising an inlet pre-grinding zone and a main grinding zone. In the inlet pre-grinding zone bar-shaped knives are welded or cast in place, namely parallel to the conical shell generating lines or at an angle to these in the stationary part, and with a bend at an angle to the conical shell generating lines as well as parallel to these in the rotating part. In the main grinding zone, the knives are arranged in a fish-bone like manner with the resulting longitudinal axes of the knives approximately parallel to the conical shell generating lines in the stationary part, and are inserted parallel to the conical shell generating lines in the rotating part.
The paper pulp in the form of a fiber suspension of, for example, 5% by weight fibers dissolved in 95% by weight water is fed into the refiner equipment by means of a pump and is processed between the knife edges and the knife surfaces. In the inlet region of the equipment, the knives must be robust and arranged with a relatively wide distance therebetween. The danger of clogging of the equipment can only be safely prevented with such an open inlet.
However, the wide spaces between the knives result in that the cutting edge length per second of the equipment achieves low values, whereby the attainable grinding effect is reduced in an undesirable manner. In previous embodiments of cone-shaped equipment, the parameters required for this inlet zone substantially determine the design of the entire remaining grinding surface.
It is an object of the invention to provide grinding equipment of the type initially described, in particular with regard to the knife arrangement of the refiner, which is substantially independent of the inlet parameters.
This object is solved in accordance with the invention in that a pregrinding zone is arranged upstream of one or more fine grinding zones whose configuration or arrangement are adapted to the respective state and desired development of the fibers in the grinding stock flowing through the grinding equipment, zones whose configuration and arrangement are adapted to the respective state and desired development of the fibers of the grinding stock flowing through the grinding equipment, planar layout, to the conical shell lines in the pre-grinding zone amount to at least approximately 10% and in the fine grinding zone to at least approximately 20%.
With this, the transferal of the grinding energy to the fibers can be controlled exactly by means of practically unlimited possibilities of variation of the configurations.
The fine grinding zones differ considerably from the pre-grinding zone, namely with regard to the geometry--width of the knives, width and thickness of the channels between the knives, knife angles with respect to the conical shell generating lines--and also with regard to the knife materials used.
The considerably finer knife structure in the fine grinding zone in comparison to the pre-grinding zone leads on the one hand to a relatively gentle tre
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patent: 27246 (1860-02-01), Sweet
patent: 349332 (1886-09-01), Anderson
patent: 2651976 (1953-09-01), Sutherland
patent: 2931586 (1960-04-01), Messing
patent: 3452939 (1969-07-01), Johnson
patent: 3614826 (1971-10-01), Pilao
Bematec S.A.
Rosenbaum Mark
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