US3797384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple belt press
Assignee: Beloit Corp
•
Filing: 1971-12-20
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Granted: 1974-03-19
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Expires: 1991-12-20
Abstract
Abstract A press structure for pressing a traveling fibrous web including a support roll with first, second and third belts wrapped over a portion of the roll and forming an extended pressing zone with the belts engaging each other successively along the zone so that the pressure will increase with each additional belt applied to the pressing zone.
Inventors
- 👤 D Hoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/0209
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine comprising in combination: a support roll mounted for rotation for receiving and carrying a moisture containing web from a web forming section; a first tensioned pressing belt wrapping a portion of the support roll and defining with the roll an extended pressing zone through the area of wrap throughout which the web is pressed; a second tensioned pressing belt laid over the first belt for at least a portion of said pressing zone with the web subjected to the forces of both belts against the roll for the area wrapped by said second belt and subjected to forces of the first belt in the area wrapped solely by the first belt; and means between the belts and roll positioned against the web for receiving water expressed from the web.
Claim 2
Dependent Claim
145 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine comprising in combination: a support roll mounted for rotation for receiving and carrying a moisture containing web from a web forming section; a first tensioned pressing belt wrapping a portion of the support roll and defining with the roll an extended pressing zone through the area of wrap throughout which the web is pressed; a second tensioned pressing belt laid over the first belt for at least a portion of said pressing zone with the web subjected to the forces of both belts against the roll for the area wrapped by said second belt and subjected to forces of the first belt in the area wrapped solely by the first belt; and means between the belts and roll positioned against the web for receiving water expressed from the web.
Claim 3
Dependent Claim
62 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 1 and including a third tensioned pressing belt laid over the second belt for at least a portion of the pressinG zone with the web subjected to the forces of each of the belts against the support roll in said zone.
Claim 4
Dependent Claim
42 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 1 wherein said second belt engages the first belt at a secondary location after the starting point of said pressing zone.
Claim 5
Dependent Claim
74 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 2 and including a third tensioned pressing belt laid over the second belt for at least a portion of the press zone with the web subjected to the forces of each of the belts in said zone and with said third belt engaging the second belt at a location after said secondary location.
Claim 6
Dependent Claim
62 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 1 and including first tension control means for the first belt, and second tension control means for the second belt so that different tensions can be placed in each belt for controlling the pressure on the web along said pressing zone.
Claim 7
Dependent Claim
53 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 5 and including a third tensioned pressing belt laid over the second belt for at least a portion of the pressing zone, and a third tension control means for the third belt.
Claim 8
Dependent Claim
43 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 1 and including means for changing the angle of wrap of said first belt to change the length of said pressing zone.
Claim 9
Dependent Claim
55 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 1 with means for changing the angle of wrap of the second belt to change the length of time that the web is subjected to the pressures of both belts in said pressing zone.
Claim 10
Dependent Claim
48 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 1 and including means for controlling the tension of at least one of said belts for controlling the pressure applied to the web in said pressing zone.
Claim 11
Dependent Claim
57 words
A press structure for pressing and dewatering a traveling fibrous web in a paper making machine constructed in accordance with claim 1 wherein a felt is passed through said pressing zone between the roll and the web and the roll is provided with grooves for aiding in the transfer of moisture from the web to the felt.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |