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US3929065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wedge press for continuous dehydration of a web of fibrous material, such as fiberboard, especially
Assignee: JM Voith GmbH
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Filing: 1974-05-07
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Granted: 1975-12-30
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Expires: 1994-05-07
Abstract
Abstract Device for continuous dehydration of a web of fibrous material including two pressure plates pervious to water and mutually disposed so as to form a wedge-shaped gap therebetween, the wedge angle of the gap and the mutual spacing of the pressure plates being adjustable, and a water-permeable belt looped around the pressure plates respectively, one of the pressure plates having a portion projecting beyond the other pressure plate at the narrow end of the wedge-shaped gap, suction chamber means located at least at the projecting portion and at a region of the one pressure plate immediately preceding the projecting portion in direction of feed of a web of fibrous material through the wedgeshaped gap from the wide to the narrow end thereof, the other pressure plate being formed with perforations.
Inventors
- 👤 Elemer Csordas
- 👤 Karl Gaugenmaier
- 👤 Gerhard Kotitschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:50
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/0209; D21J; D21J1/00; D21J1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
168 words
Device for continuous dehydration of a previously formed web of fibrous material, such as fiberboard, containing moisture, comprising two pressure plates pervious to water and mutually disposed so as to form a wedge-shaped gap therebetween, the wedge angle of said gap and the mutual spacing of said pressure plates being adjustable, and a water-permeable belt looped around said pressure plates, respectively, one of said pressure plates having a terminating portion projecting beyond the other pressure plate at the narrow end of said wedge-shaped gap, suction chamber means located at least at said terminating projecting portion so as to apply suction to the web as the pressure exerted by the pressure plates on the web terminates for preventing rewetting of the web and additional suction means at a region of said one pressure plate immediately preceding said projecting portion in direction of feed of a web of fibrous material through said wedge-shaped gap from the wide to the narrow end thereof, said other pressure plate being formed with perforations.
Claim 2
Dependent Claim
168 words
Device for continuous dehydration of a previously formed web of fibrous material, such as fiberboard, containing moisture, comprising two pressure plates pervious to water and mutually disposed so as to form a wedge-shaped gap therebetween, the wedge angle of said gap and the mutual spacing of said pressure plates being adjustable, and a water-permeable belt looped around said pressure plates, respectively, one of said pressure plates having a terminating portion projecting beyond the other pressure plate at the narrow end of said wedge-shaped gap, suction chamber means located at least at said terminating projecting portion so as to apply suction to the web as the pressure exerted by the pressure plates on the web terminates for preventing rewetting of the web and additional suction means at a region of said one pressure plate immediately preceding said projecting portion in direction of feed of a web of fibrous material through said wedge-shaped gap from the wide to the narrow end thereof, said other pressure plate being formed with perforations.
Claim 3
Dependent Claim
44 words
Device according to claim 1 wherein said one pressure plate extending beyond said wedge-shaped gap is formed with perforations at a region thereof located at the wide end of said wedge-shaped gap through which the web of fibrous material is fed into said gap.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |