Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1994-07-19
1995-11-14
Lacey, David L.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
2412612, 162261, B02C 2302
Patent
active
054659159
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the field of precisely dividing a flow of fibrous material into two or more equally measured flows.
BACKGROUND OF THE INVENTION
In many industrial applications it is necessary to divide a flow of materials into a number of equal, smaller flows. This is normally accomplished by utilizing volumetric metering screws. However, this method becomes useless when, because of various process requirements, the material is first processed and dewatered through a screw press or a plug feeder. Material passing through this equipment will drastically alter its density. That will result in uneven density, which volumetric metering screws cannot properly handle. Such operation is nowhere more important than in the refining of woodchips or other cellulosic material in a twin flow refiner, i.e. a refiner having one rotating rotor element between two stationary elements, thereby forming two grinding zones.
A twin flow refiner relies entirely on the mat of fibrous material being fed to each side of the rotating rotor element, where the grinding zones are contained. It is imperative to maintain the gaps of the two grinding zones within one-half thousandth of an inch, otherwise an inferior fiber quality will be produced. Although each stationary element forming a side of the gap of the grinding zones is individually controlled by a servo mechanism, the rotating rotor position is entirely dependent on the nature of the fibrous mat which is maintained continuously in the two grinding zones. Uneven flow of each zone will result in disastrous fiber quality problems.
The present invention concerns a device that will restore the homogeneous density of the wood chips and fibrous material after being processed and dewatered through the screw press or plug feeder and at the same time spread the material evenly into two or more metering screws. It has been found that this device provides improvement in fiber quality with superior paper tensile strength.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a disintegrating zone to obtain an even density of the incoming material flow and spread the material evenly into the metering screws.
In accordance with the present invention, this and other objects have now been accomplished by the invention of apparatus for controlling the flow of fibrous material. The apparatus comprises a substantially horizontal feeder press including an inlet and an outlet end for feeding a plug of fibrous material therebetween, a vertical housing having a lower outlet end, at least one rapidly rotatable spreader screw disposed in the vertical housing, the outlet end of the feeder press connected to the vertical housing, a metering housing, at least two metering screws disposed in the metering housing, the metering screws being disposed below the outlet end of the vertical housing, and spreader disk means disposed at the outlet end of the vertical housing for disintegrating the fibrous material and distributing the disintegrated fibrous material to the metering housing containing the metering screws.
In accordance with one embodiment of the apparatus of the present invention, one rapidly rotatable spreader screw is utilized. In another embodiment, the at least one rotatable spreader screw comprises first and second threads, and preferably the spreader disk means comprises a plurality of vanes, most preferably comprising direct extensions of the first and second threads.
In accordance with another embodiment of the apparatus of the present invention, the at least one rapidly rotatable spreader screw comprises at least one thread comprising a flank portion, and including teeth thereon.
In accordance with another embodiment of the apparatus of the present invention, the at least one rapidly rotatable spreader screw comprises first and second rapidly rotatable spreader screws. The apparatus preferably includes steam disk means cooperating with the outlet end of the feeder press for preventing steam from flowing from the vertical h
REFERENCES:
patent: 4223847 (1980-09-01), Tantalo et al.
patent: 4457804 (1984-07-01), Reinhall
patent: 4600475 (1986-07-01), Reinhall et al.
patent: 4878997 (1989-11-01), Reinhall
Ahlen Arne
Johansen Thor
Mokvist Anders
Lacey David L.
Padgett Calvin
Sunds Defibrator Industries Aktiebolag
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