US3693891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood grinding
Assignee: NORTON S REMMER
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Filing: 1971-06-24
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Granted: 1972-09-26
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Expires: 1991-06-24
Abstract
Abstract The invention is concerned with the grinding of wood, and in particular to the production of wood pulp in the paper-making industry. The invention provides a method for the grinding of wood which includes the steps of: (a) urging wood against a grinding surface which is adapted for rotation by a source of power, (b) applying to the grinding surface a flow of cooling liquid, (c) maintaining the ratio of the pressure of the wood against the grinding surface to the rate of flow of coolant liquid at a substantially constant value, and (d) maintaining the energy supplied by the source of power per unit weight of ground wood produced at a substantially constant level. The invention also contemplates the provision of apparatus for the grinding of wood which comprises: (a) a grinding surface adapted to be rotated by a source of power, (b) means for urging wood against the grinding surface, (c) means for applying to the grinding surface a flow of cooling liquid, (d) means for maintaining the ratio of the pressure of the wood against the grinding surface to the rate of flow of coolant liquid at a substantially constant value, and (e) means for maintaining the energy supplied by the source of power per unit weight of ground wood produced at a substantially constant level.
Inventors
- 👤 Norton S Remmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:12
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/06; D21B1/063
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
163 words
In a method of grinding wood which includes urging wood against a grinding surface, which surface is adapted for rotation by a source of power and has a flow of cooling liquid applied thereto, the steps of: a. determining the rate factor at which wood is being ground; b. determining the factor of the rate at which power is being consumed by said source of power; c. determining the pressure factor urging the wood against said grinding surface; d. determining the rate of flow factor of said coolant liquid; e. varying at least two of the determined factors of rate of power consumption, rate of flow of coolant liquid, and pressure, to maintain the ratio between the pressure urging the wood against the grinding surface and the rate of flow of coolant liquid at a predetermined and substantially constant value, and to maintain at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 2
Dependent Claim
67 words
A method of grinding wood as defined in claim 2 which includes the steps of: e. varying said pressure factor so as to maintain the ratio between the pressure and the rate of flow of coolant liquid at a substantially constant selected value; and f. simultaneously maintaining at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 3
Dependent Claim
76 words
A method of grinding wood as defined in claim 2 which includes the steps of: e. varying the rate of flow of coolant liquid factor so as to maintain the ratio between the pressure urging the wood against the grinding surface and the rate of flow at a substantially constant selected value; and f. simultaneously maintaining at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 4
Dependent Claim
84 words
A method of grinding wood as defined in claim 2 which includes the steps of: e. varying the rate of flow of coolant liquid factor so as to maintain the ratio between the pressure urging the wood against the grinding surface and the rate of flow at a substantially constant selected value; and f. varying the rate of power consumption factor to maintain at a substantially constant selected level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 5
Dependent Claim
73 words
A method of grinding wood as defined in claim 2 which includes the steps of: e. varying said pressure factor so as to maintain the ratio between the pressure and the rate of flow of coolant liquid at a substantially constant selected value; and f. varying the rate of power consumption to maintain at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 6
Dependent Claim
29 words
A method as defined in claim 2 wherein the relationship between said factors is controlled according to the equation: Ew a + m(P/Q) where a and m are constants.
Claim 7
Dependent Claim
24 words
A method of grinding wood as defined in claim 2 wherein the several factors are determined and controlled with the aid of a computer.
Claim 8
Dependent Claim
24 words
A method of grinding wood as defined in claim 3 wherein the several factors are determined and controlled with the aid of a computer.
Claim 9
Dependent Claim
24 words
A method of grinding wood as defined in claim 4 wherein the several factors are determined and controlled with the aid of a computer.
Claim 10
Dependent Claim
24 words
A method of grinding wood as defined in claim 5 wherein the several factors are determined and controlled with the aid of a computer.
Claim 11
Dependent Claim
24 words
A method of grinding wood as defined in claim 6 wherein the several factors are determined and controlled with the aid of a computer.
Claim 12
Dependent Claim
24 words
A method of grinding wood as defined in claim 7 wherein the several factors are determined and controlled with the aid of a computer.
Claim 13
Dependent Claim
22 words
A method of grinding wood as defined in claim 8 wherein said computer is an electronic digital computer adapted for process control.
Claim 14
Dependent Claim
22 words
A method of grinding wood as defined in claim 9 wherein said computer is an electronic digital computer adapted for process control.
Claim 15
Dependent Claim
22 words
A method of grinding wood as defined in claim 10 wherein said computer is an electronic digital computer adapted for process control.
Claim 16
Dependent Claim
22 words
A method of grinding wood as defined in claim 11 wherein said computer is an electronic digital computeR adapted for process control.
Claim 17
Dependent Claim
22 words
A method of grinding wood as defined in claim 12 wherein said computer is an electronic digital computer adapted for process control.
Claim 18
Dependent Claim
22 words
A method of grinding wood as defined in claim 13 wherein said computer is an electronic digital computer adapted for process control.
Claim 19
Dependent Claim
94 words
A wood grinding assembly including: a. a grinding surface adapted to be rotated by a source of power, b. means for urging wood against said grinding surface, c. means for applying to said grinding surface a flow of cooling liquid, d. means for maintaining the ratio between the pressure of the wood against the grinding surface and the rate of flow of coolant liquid at a substantially constant value, and e. means for maintaining at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 20
Dependent Claim
168 words
A wood grinding assembly including: a. a grinding surface adapted to be rotated by a source of power, b. means for urging wood against said grinding surface, c. means for applying to said grinding surface a flow of cooling liquid, d. means for determining the rate at which wood is being ground, e. means for determining the rate of power consumption by said source of power, f. means for determining the pressure urging the wood against said grinding surface, g. means for determining the rate of flow of said coolant liquid, and h. means for varying at least two of (i) the rate of power consumption, (ii) the rate of flow of coolant liquid and (iii) said pressure to maintain the ratio between the pressure urging the wood against the grinding surface and the rate of flow of coolant liquid at a substantially constant value, and to maintain at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 21
Dependent Claim
63 words
A wood grinding assembly as defined in claim 21 including: h. means for varying said pressure so as to maintain the ratio between the pressure and the rate of flow of coolant liquid at a substantially constant value, and i. means for maintaining at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 22
Dependent Claim
72 words
A wood grinding assembly as defined in claim 21 including: h. means for varying the rate of flow of coolant liquid so as to maintain the ratio between the pressure urging the wood against the grinding surface and the rate of flow at a substantially constant value, and i. means for maintaining at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 23
Dependent Claim
79 words
A wood grinding assembly as defined in claim 21 including: h. means for varying the rate of flow of coolant liquid so as to maintain the ratio between the pressure urging the wood against the grinding surface and the rate of flow at a substantially constant value; and i. means for varying the rate of power consumption to maintain at a substantially constant level the energy supplied by the source of power per unit weight of ground wood produced.
Claim 24
Dependent Claim
70 words
A wood grinding assembly as defined in claim 21 including: h. means for varying said pressure so as to maintain the ratio between the pressure and the rate of flow of coolant liquid at a substantially constant value; and i. means for varying the rate of power consumption to maintain at a substantially constant in the energy supplied by the source of power per unit weight of ground wood produced.
Claim 25
Dependent Claim
20 words
A wood grinding assembly as defined in claim 20 wherein said means defined i (d) and (e) comprise a computer.
Claim 26
Dependent Claim
23 words
A wood grinding assembly as defined in claim 21 wherein said means defined in (d), (e), (f), (g) and (h) comprise a computer.
Claim 27
Dependent Claim
24 words
A wood grinding assembly as defined in claim 22 wherein said means defined in (d), (e), (f), (g), (h), and (i) comprise a computer.
Claim 28
Dependent Claim
24 words
A wood grinding assembly as defined in claIm 23 wherein said means defined in (d), (e), (f), (g), (h), and (i) comprise a computer.
Claim 29
Dependent Claim
24 words
A wood grinding assembly as defined in claim 24 wherein said means defined in (d), (e), (f), (g), (h), and (i) comprise a computer.
Claim 30
Dependent Claim
24 words
A wood grinding assembly as defined in claim 25 wherein said means defined in (d), (e), (f), (g), (h) and (i) comprise a computer.
Claim 31
Dependent Claim
21 words
A wood grinding assembly as defined in claim 26 wherein said computer is an electronic digital computer adapted for process control.
Claim 32
Dependent Claim
21 words
A wood grinding assembly as defined in claim 27 wherein said computer is an electronic digital computer adapted for process control.
Claim 33
Dependent Claim
21 words
A wood grinding assembly as defined in claim 28 wherein said computer is an electronic digital computer adapted for process control.
Claim 34
Dependent Claim
21 words
A wood grinding assembly as defined in claim 29 wherein said computer is an electronic digital computer adapted for process control.
Claim 35
Dependent Claim
21 words
A wood grinding assembly as defined in claim 30 wherein said computer is an electronic digital computer adapted for process control.
Claim 36
Dependent Claim
21 words
A wood grinding assembly as defined in claim 31 wherein said computer is an electronic digital computer adapted for process control.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |