US4301974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining apparatus
Assignee: Valmet AB
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Filing: 1979-11-30
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Granted: 1981-11-24
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Expires: 1999-11-30
Abstract
Abstract Apparatus for refining lignocellulose-containing material is disclosed, including a refiner housing, a pair of counter-rotating refining discs within the housing, one of the discs including a feed passage for refining stock and the other disc including a steam passage therethrough to permit steam to exit from the refining space between the discs, channel means rotatable with that refining disc which includes the steam passage in order to conduct steam therefrom through the refiner housing, and passage means located outside of the refiner housing for conducting away steam exiting from the channel means.
Inventors
- 👤 Axel H. Sjobom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:19
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
Apparatus for refining lignocellulose-containing material comprising a refiner housing, first and second refining disc members rotatably mounted within said refiner housing, each of said first and second refining disc members including an inner surface and an outer surface, said refining disc members being mounted so that said inner surfaces of said refining disc members are in opposed face-to-face relationship defining a refining space therebetween, a feed passage extending from said outer surface of said first refining disc member to said inner surface of said first refiner disc member for feeding said lignocellulose-containing material to said refining space, a steam passage extending from said outer surface of said second refining disc member to said inner surface of said second refining disc member so as to permit steam generated in said refining space to pass from said refining space to a point within said refiner housing, channel means rotatable with said second refining disc member for conducting steam from said outer surface of said second refining disc member entirely through said refiner housing, and passage means located entirely outside of said refiner housing for conducting away steam exiting from said channel means, said passage means being sealingly connected to said channel means to prevent leakage of steam therefrom.
Claim 2
Dependent Claim
206 words
Apparatus for refining lignocellulose-containing material comprising a refiner housing, first and second refining disc members rotatably mounted within said refiner housing, each of said first and second refining disc members including an inner surface and an outer surface, said refining disc members being mounted so that said inner surfaces of said refining disc members are in opposed face-to-face relationship defining a refining space therebetween, a feed passage extending from said outer surface of said first refining disc member to said inner surface of said first refiner disc member for feeding said lignocellulose-containing material to said refining space, a steam passage extending from said outer surface of said second refining disc member to said inner surface of said second refining disc member so as to permit steam generated in said refining space to pass from said refining space to a point within said refiner housing, channel means rotatable with said second refining disc member for conducting steam from said outer surface of said second refining disc member entirely through said refiner housing, and passage means located entirely outside of said refiner housing for conducting away steam exiting from said channel means, said passage means being sealingly connected to said channel means to prevent leakage of steam therefrom.
Claim 3
Dependent Claim
47 words
The apparatus of claim 1 wherein said steam passage extends from a point on said inner surface of said second refining disc member located radially inward with respect to said point on said inner surface of said first refining disc member from which said feed passage extends.
Claim 4
Dependent Claim
25 words
The apparatus of claim 1 wherein said channel means comprises a cylindrical annular shield affixed to said outer surface of said second refining disc member.
Claim 5
Dependent Claim
71 words
The apparatus of claim 1 wherein said refiner housing includes an outer wall, and including sealing means for sealingly connecting said channel means to said passage means, said sealing means comprising a cylindrical gap seal formed between said rotatable channel means and a point on said outer wall of said refiner housing, whereby said second refining disc member can be moved axially towards said outer wall of said refining disc member.
Claim 6
Dependent Claim
22 words
The apparatus of claim 4 wherein said point on said outer wall of said refiner housing is defined by said passage means.
Claim 7
Dependent Claim
69 words
The apparatus of claim 1 including a plurality of radially projecting bar members on said inner surface of said second refining disc member, said bar members being located radially outward with respect to said point on said inner surface of said second refining disc member from which said steam passage extends so that said bar members can assist in moving said lignocellulose-containing material radially outward through said refining space.
Claim 8
Dependent Claim
62 words
The apparatus of claim 6 wherein said plurality of bar members includes projecting means extending from said bar members towards said inner surface of said first refining disc member so as to prevent the flow of said lignocellulose-containing material radially inward through said refining space towards said steam passage while permitting steam to flow into said steam passage from said refining space.
References Cited (Backward Citations)
GB641298A
Cited
US3207450A
Cited
CA974958A
Cited
CA1052156A
Cited
DE2713300A1
Cited
US4221343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |