Refining disc for disc refiners

Details Refining disc for disc refiners Refining disc for disc refiners

2000-03-13

2001-08-21

Rosenbaum, Mark (Department: 3725)

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

C241S298000

Reexamination Certificate

active

06276622

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a refining disk for disk refiners of the type that includes spaced ridges or ribs which extend over the refining zones of the disk.
BACKGROUND OF THE INVENTION
In disk refiners fitted with refining disks of the above-described type, the material to be refined is treated in a space defined between two refining disks, and the fibers in that material are treated at the location where the ribs or ridges meet one another. Because the ribs meet at an angle to one another as the disks rotate, so-called clip refining occurs. This should be avoided, since it impairs the quality of the treated material.
Attempts have been made to solve this problem by using spaced arcuate ribs or ridges; reference in this regard can be made to U.S. Pat. Nos. 3,674,217 and 4,023,737. It is stated in these prior patents that the fiber material will be worked uniformly when the ribs or ridges are arcuate and that defibration is achieved with the minimum of fiber clipping. These proposals, however, do not provide any real solution to the problem, since the ridges on the two counteracting disks do not meet each other along their full lengths, in spite of this.
The object of the present invention is thus to solve the aforesaid problems and to avoid clip-refining of the material being treated.
SUMMARY OF THE INVENTION
In accordance with the present invention, these and other objects have now been realized by the invention of a refining disk having a surface, an inner end and an outer end and including a plurality of ribs generally extending outwardly towards the outer end across the surface, the plurality of ribs having a uniform width and being curved with the shape of an involute arc with circular evolutes.
In accordance with one embodiment of the present invention, a disk refiner is disclosed including a first refining disk and a second relatively rotatable refining disk facing the first refining disk with a refining space therebetween, the first and second refining disks having a surface, an inner end and an outer end and including a plurality of ribs generally extending outwardly towards the outer end across the surface, the plurality of ribs including a pair of edges and having a uniform width, and being curved with the shape of an involute arc with circular evolutes, whereby the direction of rotation of the first refining disk can be reversed so that both of the pair of edges of the ribs can be used for refining purposes. In a preferred embodiment, the plurality of ribs on the first refining disk have a first pitch and the plurality of ribs on the second refining disk have a second pitch, the first pitch and the second pitch being different.


REFERENCES:
patent: 3674217 (1972-07-01), Reinhall
patent: 4023737 (1977-05-01), Leider et al.
patent: 5975438 (1999-11-01), Garasimowicz

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