US4372495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for comminuting using abrasive discs in a disc refiner
Assignee: Research Foundation of the State University of New York
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Filing: 1980-04-28
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Granted: 1983-02-08
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Expires: 2000-04-28
Abstract
Abstract An apparatus for comminuting a substance which comprises a rotatable disc having a disintegrating surface and a base surface proximate to and facing the disintegrating surface. The apparatus has a means for rotating the disc and for feeding particles of the substance between the disintegrating surface and base surface. At least one of the disintegrating surface and base surface comprise an abrasive and at least one of the base surface and disintegrating surface comprise breaker bars. The invention also includes a novel disc for use in a disc refiner having an abrasive disintegrating surface and a novel comminuting plate for use as part of such a disc. The apparatus also desirably comprises a means for elevating the temperature of the substance being comminuted and desirably comprises a means for pressurizing the environment surrounding the substance being comminuted especially when the substance is wet wood chips and the desired product is fiberized wood pulp. The invention also includes a process for comminuting a substance by feeding particles of the substance into the apparatus and wood pulp made by the process.
Inventors
- 👤 Renata Marton
- 👤 Alton F. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:49
CPC Classifications
B; B02; B02C; B02C7/00; B02C7/11; B02C7/12; B02C7/02; B02C7/06
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
97 words
A mechanical comminuting plate for use as a part of a mechanical comminuting disc, said plate comprising a truncated circular sector having a disintegrating surface, said surface being divided by an arc of the circle of the sector into adjacent inside and outside surfaces, the inside surface of which is provided with a series of integral breaker bars each of which has a longitudinal axis essentially parallel with the nearest diameter of the circle of the sector and said outside surface comprising an abrasive having an average particle size of between about 140 micrometers and 1/4 centimeter.
Claim 2
Dependent Claim
97 words
A mechanical comminuting plate for use as a part of a mechanical comminuting disc, said plate comprising a truncated circular sector having a disintegrating surface, said surface being divided by an arc of the circle of the sector into adjacent inside and outside surfaces, the inside surface of which is provided with a series of integral breaker bars each of which has a longitudinal axis essentially parallel with the nearest diameter of the circle of the sector and said outside surface comprising an abrasive having an average particle size of between about 140 micrometers and 1/4 centimeter.
Claim 3
Dependent Claim
28 words
The mechanical comminuting plate of claim 1 wherein the area of the outside surface has from about 1.5 to about 2.5 times the area of the inside surface.
Claim 4
Dependent Claim
25 words
The plate of claim 1 wherein the bars protrude to a height equal to from to one-tenth to one-half of the thickness of the plate.
Claim 5
Dependent Claim
20 words
The plate of claim 3 wherein the circular sector has an outside edge in the form of a 60° arc.
Claim 6
Dependent Claim
24 words
The plate of claim 3 wherein the area of the outside surface is from 1.5 to 2.5 times the area of the inside surface.
Claim 7
Dependent Claim
26 words
The plate of claim 3 wherein the abrasive is a ceramic material selected from the group consisting of silica, alumina, silicon carbide, zirconia and tungsten carbide.
Claim 8
Dependent Claim
19 words
The plate of claim 6 wherein the abrasive has a grit size of between about 40 and 120 grit.
Claim 9
Independent Claim
178 words
An apparatus for mechanically comminuting a substance which is solid at the comminuting temperature which apparatus comprises a first rotatable disc having a disintegrating surface; a base surface proximate to and facing said disintegrating surface, said base surface and said disintegrating surface being harder than the substance being comminuted and said surfaces being separated along at least a portion of said surfaces by a distance of from 0 to 1 millimeters; a means for rotating said disc and means for feeding particles of said substance between the disintegrating surface and the base surface, at least one of the disintegrating surface and the base surface comprising an abrasive having an average particle size of between 140 micrometers and 1/4 centimeter, and at least one of the disintegrating surface and the base surface comprising breaker bars, each of said bars having a longitudinal axis in a plane approximately perpendicular to a circle of the disc at the intersection of the axis with the circle, said disc comprising a plurality of plates, the combined surfaces of which form said disintegrating surface.
Claim 10
Independent Claim
178 words
An apparatus for mechanically comminuting a substance which is solid at the comminuting temperature which apparatus comprises a first rotatable disc having a disintegrating surface; a base surface proximate to and facing said disintegrating surface, said base surface and said disintegrating surface being harder than the substance being comminuted and said surfaces being separated along at least a portion of said surfaces by a distance of from 0 to 1 millimeters; a means for rotating said disc and means for feeding particles of said substance between the disintegrating surface and the base surface, at least one of the disintegrating surface and the base surface comprising an abrasive having an average particle size of between 140 micrometers and 1/4 centimeter, and at least one of the disintegrating surface and the base surface comprising breaker bars, each of said bars having a longitudinal axis in a plane approximately perpendicular to a circle of the disc at the intersection of the axis with the circle, said disc comprising a plurality of plates, the combined surfaces of which form said disintegrating surface.
Claim 11
Dependent Claim
16 words
The apparatus of claim 8 wherein the base surface comprises the surface of a grinding stone.
Claim 12
Dependent Claim
18 words
The apparatus of claim 8 wherein the base surface comprises the disintegrating surface of a second rotatable disc.
Claim 13
Dependent Claim
27 words
The apparatus of claim 10 wherein means is provided for rotating the second rotatable disc in a direction opposite to the rotation of the first rotatable disc.
Claim 14
Dependent Claim
15 words
The apparatus of claim 8 wherein the first rotatable disc comprises an abrasive disintegrating surface.
Claim 15
Dependent Claim
93 words
The apparatus of claim 8 wherein each of said plates comprises a truncated circular sector having a disintegrating surface, said disintegrating surface being divided by an arc of the article of the sector into adjacent inside and outside surfaces, the inside surface of which is provided with a series of integral breaker bars each of which has a longitudinal axis essentially parallel with the nearest diameter of the circle of the sector and in a plane essentially perpendicular to the arc of rotation of the disc and the outside surface comprising said abrasive.
Claim 16
Dependent Claim
30 words
A process for forming a fiber pulp by mechanically fiberizing and disintegrating a fiber containing substance which process comprises feeding particles of the substance into the apparatus of claim 13.
Claim 17
Dependent Claim
21 words
The process of claim 14 wherein the comminuted substance is wood pulp and the particles of the substance are wood chips.
Claim 18
Dependent Claim
29 words
The apparatus of claim 8 wherein means is provided for elevating the temperature of the substance being comminuted to a temperature of from above 100° to about 170° C.
Claim 19
Dependent Claim
30 words
A process for forming a fiber pulp by mechanically fiberizing and disintegrating a fiber containing substance which process comprises feeding particles of the substance into the apparatus of claim 16.
Claim 20
Dependent Claim
21 words
The process of claim 17 wherein the comminuted substance is wood pulp and the particles of the substance are wood chips.
Claim 21
Dependent Claim
30 words
The apparatus of claim 16 wherein means is provided for pressurizing the environment surrounding the substance being comminuted to from about 1.2 to about 8 kilograms per square centimeter absolute.
Claim 22
Dependent Claim
30 words
A process for forming a fiber pulp by mechanically fiberizing and disintegrating a fiber containing substance which process comprises feeding particles of the substance into the apparatus of claim 19.
Claim 23
Dependent Claim
21 words
The process of claim 20 wherein the comminuted substance is wood pulp and the particles of the substance are wood chips.
Claim 24
Dependent Claim
59 words
The apparatus of claim 19 wherein the substance is wood chips, and means is provided for increasing the water content of the wood and the means for increasing the water content, the means for elevating the temperature and the means for pressurizing the environment are at least partially included within a means for surrounding the chips with pressurized steam.
Claim 25
Dependent Claim
18 words
A process for comminuting a substance by feeding particles of the substance into the apparatus of claim 8.
Claim 26
Dependent Claim
30 words
A process for forming a fiber pulp by mechanically fiberizing and disintegrating a fiber containing substance which process comprises feeding particles of the substance into the apparatus of claim 8.
Claim 27
Dependent Claim
21 words
The process of claim 24 wherein the comminuted substance is wood pulp and the particles of the substance are wood chips.
Claim 28
Dependent Claim
96 words
A mechanical comminuting disc comprising a plurality of adjacent comminuting plates each of said plates comprising a truncated circular sector having a disintegrating surface, said surface being divided by an arc of the circle of the sector into adjacent inside and outside surfaces, the inside surface of which is provided with a series of integral breaker bars each of which has a longitudinal axis essentially parallel with the nearest diameter of the circle of the sector and said outside surface comprising an abrasive having an average particle size of between about 140 micrometers and 1/4 centimeters.
Claim 29
Dependent Claim
96 words
A mechanical comminuting disc comprising a plurality of adjacent comminuting plates each of said plates comprising a truncated circular sector having a disintegrating surface, said surface being divided by an arc of the circle of the sector into adjacent inside and outside surfaces, the inside surface of which is provided with a series of integral breaker bars each of which has a longitudinal axis essentially parallel with the nearest diameter of the circle of the sector and said outside surface comprising an abrasive having an average particle size of between about 140 micrometers and 1/4 centimeters.
Claim 30
Dependent Claim
25 words
The mechanical comminuting disc of claim 26 wherein the outside surface has from about 1.5 to about 2.5 times the area of the inside surface.
Claim 31
Dependent Claim
26 words
The mechanical comminuting disc of claim 26 wherein the bars protrude to a height equal to from one-tenth to one-half of the thickness of the plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |