Disk refiner having sliding rigid multiple disks

Details Disk refiner having sliding rigid multiple disks Disk refiner having sliding rigid multiple disks

1986-02-25

1988-11-08

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

241290, 241297, B02C 714

Patent

active

047830140

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to disk refiners, and more particularly to disk refiners for providing a low intensity treatment of pulp fiber to increase the strength characteristics of the pulp and reduce the amount of specific energy required during refining.
It has recently been shown that low intensity treatment of certain pulp fiber increases the strength of characteristics of the pulp while reducing the amount of specific energy required. In this context, intensity for a given throughput is proportional to the horsepower per inch of refiner bar crossings, as disclosed in U.S. Pat. No. 4,661,911 filed Jan. 31, 1985, in which specific operational parameters of a refining system are sensed to control the refiner disk spacing by way of a gearmotor. A reduction in intensity, therefore, may be accomplished by increasing the number of refining surfaces in a given refiner.
It is the object of the present invention to provide a new and improved multi-disk refiner for low intensity treatment of pulp fiber.
The above object is achieved, according to the present invention, in providing an increase in the number of refining surfaces by mounting several rigid refiner disks in a manner so as to provide each disk with complete freedom of axial movement. The rotating refiner disks can be mounted so as to be axially slidable on a torque transmitting section of a shaft so that rotational forces can be transmitted to the disks while an axial motion thereof is not restrained. The torque transmitting section of the shaft may be splined or have a geometrical cross-sectional (e.g. square, triangular or other polygon) and the rotatable disks may have correspondingly shaped central openings receiving the respective torque transmitting section. Non-rotatable or fixed refiner disks can be supported by several support lemens (e.g. pins, guide rails and the like) which prevent rotation of the disk, but permit each such refiner disk to slide in the axial direction. The shaft and the stator support elements can be constructed of a hard material, and the sliding members may be constructed of softer, wearable material. The sliding members may also be molded from a structural plastic material. The non-rotating disks each include a central aperture for receiving the shaft therethrough and for supporting the flow of paper stock and the rotating disks each include ports to permit the paper stock to flow therethrough and be properly distributed to each pair of refiner disks.
The refiner may be loaded to the desired power by axially adjusting the last stationary element of a series of refiner disks.
Inasmuch as the refiner disks are not axially secured to the refiner shaft or housing, the number of plates may easily be increased or decreased in the refiner to match the process requirements.
Also, inasmuch as there is no limitation on the axial movement of the refiner disks, a large number of plates may be added to a refiner to increase the overall capacity of a given size of the refiner. Therefore, a smaller diameter refiner having many refiner discs may be used in place of a large refiner having fewer discs. This reduces the capital expense for large horsepower, low speed motors which are required by the larger diameter refiners.
Other objects, features and advantages of the invention, its organization, construction and operation will be best understood from the following detailed description, taken in conjunction with the accompanying drawings.


ON THE DRAWINGS

FIG. 1 is a fragmentary sectional view of a refiner constructed in accordance with the present invention;
FIG. 2 is a fragmentary enlarged view of a portion of the refiner illustrated in FIG. 1;
FIG. 3 is a partial sectional view taken substantially along the parting line III--III of FIG. 1;
FIG. 4 is a fragmentary sectional view illustrating a shaft having a square torque transmitting section;
FIG. 5 is a fragmentary sectional view illustrating a shaft having a triangular torque transmitting section;
FIG. 6 is a fragmentary sectional view illustrating a shaft having a hexagonal

REFERENCES:
patent: 1991899 (1935-02-01), Holbeck
patent: 2661667 (1953-12-01), Knoll
patent: 3448934 (1969-06-01), Vaughan
patent: 3717309 (1973-02-01), Luker et al.
patent: 4570862 (1986-02-01), Kirchner

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