US3674217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulp fiberizing grinding plate
Assignee: Individual
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Filing: 1970-07-30
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Granted: 1972-07-04
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Expires: 1990-07-30
Abstract
Abstract A pulp fiberizing grinding plate or disc, known in the art as the ''''Asplund Defibrator,'''' employed for breaking down wood chips, or the like fibrous material into fibers for use in various pulp employing processes, such for example, as in the paper industry, or the like. The defibrator plate or disc is formed of disc segments with a grinding face having a plurality of upstanding ribs extending across the working area of the plate, with the ribs at the beginning of the working area lying at an angle of between 0* and 60* to a radius intercepting the rib at the commencement of the rib in the working area, with the rib gradually transitioning across the working area at a progressively increasing angle to the plate radius, until at the circumference, the ridge is at an angle of between 65* and 90* to the radius. The ridges of this plate face similar ridges on an opposed grinding surface, with relative movement provided for between the grinding surfaces. As a result of the angulation of the ridges or ribs, the previously encountered problems of fiber breakage, occurring on previously evolved grinding plates is eliminated, since the angulation between the relatively moving ridges minimizes the shear forces exerted on the fibers, producing instead of the conventional fiber cutting action, a compressive fiber separating pushing force.
Inventors
- 👤 Rolf Bertil Reinhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:23
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
A grinding plate segment as in claim 1 in which each oF said ribs is formed with a rounded fillet between the rib sidewall and the channel bottom on the side of said rib closest to the beginning of the working area of said grinding plate.
Claim 2
Dependent Claim
23 words
A grinding plate segment as in claim 2 in which the opposite side of said ribs extends substantially perpendicular to the channel bottom.
Claim 3
Dependent Claim
119 words
A grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0* and 60* to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65* and 90* to a radius intercepting the end of the rib at the periphery of the working area of said plate member and plurality of dam ridges are formed at spaced intervals on said plate member between two adjacent ribs.
Claim 4
Dependent Claim
30 words
A grinding plate segment as in claim 4 in which adjacent channels have dam ridges at different spaced points so that the free length of adjacent channels will be different.
Claim 5
Dependent Claim
34 words
A grinding plate segment as in claim 4 in which said dam ridges are formed with a rounded fillet formed on the downstream side of said ridge between the ridge and the channel bottom.
Claim 6
Dependent Claim
136 words
A grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0* and 60*j to the radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65* and 90* to a radius intercepting the end of the rib at the periphery of the working area of said plate member, at least one of the channels of the segment being formed with a spacing between the ribs defining said channel of a gradually approaching orientation in a direction towards the outer edge of said segment.
Claim 7
Dependent Claim
129 words
A grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0* and 60* to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65* and 90* to a radius intercepting the end of the rib at the periphery of the working area of said plate member, some of the channels downstream of other of said channels in the direction of the flow of material over said segment having greater cross-section than the preceding channels.
Claim 8
Dependent Claim
130 words
A grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0* and 60* to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65* and 90* to a radius intercepting the end of the rib at the periphery of the working area of said plate member, at least one of said ribs being formed with entry tips cut at an angle to the direction of flow of material in the channels formed by said ribs.
Claim 9
Dependent Claim
123 words
A grinding plate segment comprising: a plate member having a grinding face on one surface thereof; a plurality of spaced ribs on said face with material flow channels between said ribs, said ribs extending across the working area of the grinding face, and lying at an angle of between 0* and 60* to a radius of the plate intercepting the end of the rib at its beginning in the plate working area, and at an angle of between 65* and 90* to a radius intercepting the end of the rib at the periphery of the working area of said plate member, at least some of said ribs being formed of gradually increasing height at their ends adjacent the beginning of the working area.
Claim 10
Independent Claim
93 words
A method of breaking fibrous material into its fiber constituents comprising the steps of moving the fibrous material along a rigid surface; exerting a pushing force on the fibrous material at an angle to the desired direction of movement of the fibrous material having a vector resultant in the desired direction of movement, said pushing force being exerted at an angle of between 15* and 75* to a diameter perpendicular to the desired direction of movement of said fibrous material, thereby minimizing the shear force exerted on the fibers of said fibrous material.
Claim 11
Dependent Claim
40 words
A method as in claim 11 in which the pushing force on said fibrous material is periodically relieved as the fibrous material is moved over the rigid surface, thus disturbing any equilibrium of said material, and implementing its break down.
Claim 12
Dependent Claim
128 words
A grinding disc having a grinding surface formed by spaced arcuate ribs and channels intermediate said ribs, said ribs extending from the beginning of a working area towards the center of said disc at an angle of between 0* and 60* to a radius of said disc and increasing progressively as the distance from the center increases towards the periphery of said disc where said ribs lie at an angle of between 65* and 90* to the radius of said disc, the rate of increase of the angle of said ribs with respect to the disc radius being such as to correspond to the decrease in the rate of feed of material and to the increase in channel area to maintain said channels filled with fibrous material throughout.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |