US3765611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining process
Assignee: Sprout Bauer Inc
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Filing: 1972-08-07
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Granted: 1973-10-16
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Expires: 1992-08-07
Abstract
Abstract A process of refining pulp type materials utilizing a double revolving disc refiner characterized by introducing said materials into a double revolving disc refiner while maintaining the same under sealed pressurized conditions and subjecting the materials within said refiner to passage between opposed refining surfaces, each of which rotates relative the other with a spacing therebetween not less than about 0.04 inches and from about 0.04 to 0.10 inches, while subjecting said materials to elevated pressures and correspondingly elevated temperatures, and, in movement between said refining surfaces, inducing said materials to form into fiber bundles and individual fibers in a manner to gently produce a separation of the constitutent components of the materials and issue the materials in a form wherein the fibers are relatively long and relatively unscarred.
Inventors
- 👤 H Steiniger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:03
CPC Classifications
B; B02; B02C; B02C7/00; B02C7/02; D; D21; D21D; D21D1/00; D21D1/20; D21D1/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
45 words
A method of refining fibrous materials according to claim 1 characterized by maintaining said refining surfaces with a spacing therebetween from about 0.04 to 0.10 inches while particles of said materials are induced to flow between said refining surfaces for reduction thereof to fiber form.
Claim 2
Dependent Claim
48 words
A method of refining fibrous materials as set forth in claim 1 characterized by limiting the space between said refining surfaces to a distance from approximately 0.04 to 0.08 inches during the operation thereof on said materials in particle form to reduce the same to their fiber content.
Claim 3
Dependent Claim
39 words
A method of refining fibrous materials as set forth in claim 1 characterized by maintaining on said materials during the passage thereof between said refining surfaces a pressure not less than about 100 p.s.i.g. and a correspondingly elevated temperatUre.
Claim 4
Dependent Claim
36 words
A method of refining fibrous materials as set forth in claim 1 characterized by subjecting said materials in particle form to a temperature not lower than about 320* F. during passage thereof between said refining surfaces.
Claim 5
Dependent Claim
66 words
A method of refining fibrous materials as set forth in claim 1 characterized by introducing said materials in particle form and maintaining a pressure on said particles in the range of 100 to 150 p.s.i.g. while passing the same between said refining surfaces and during passage of the particles between said refining surfaces maintaining said refining surfaces spaced apart a distance from 0.04 to 0.10 inches.
Claim 6
Dependent Claim
43 words
The method of refining fibrous materials according to claim 1 characterized by a further step of applying a conditioning medium directly to said materials within the same pressurized environment as that to which said materials are subjected in movement between said refining surfaces.
Claim 7
Dependent Claim
25 words
The method of refining fibrous materials according to claim 7 characterized by applying said conditioning medium on said materials in transit to said refining surfaces.
Claim 8
Dependent Claim
38 words
The method of refining fibrous materials according to claim 7 characterized by applying said conditioning medium to said materials in transit to said refining casing and in a vessel in open and direct communication with said refiner casing.
Claim 9
Independent Claim
200 words
A method of refining fibrous materials, including the step of providing a sealed environment therefor wherein means define a flow path for said materials to move directly through said environment, providing for certain material to enter said flow path under conditions precluding communication of said environment with ambient surroundings and to leave said flow path under like conditions, within said environment passing said material in said path between opposed refining surfaces, each of which is rotated, one relative to the other, maintaining a relatively wide spacing between said refining surfaces in the range of 0.04 to 0.10 inches so that the flow of the fibrous material therebetween is relatively free and rapid, in a single pass of said material between said refining surfaces converting the same to a condition distinguished by relatively long and relatively unscarred fiber elements, and pressurizing said environment by admitting pressure fluid to said path to provide that the fibrous material flows to and between said surfaces in a pressurized condition and subjecting said materials to a digesting action immediately prior to their passage between said refining surfaces and in an environment wherein the conditions are common to the environment within which said refining surfaces operate.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |