US3748225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous web press nip structure including nonporous belts backed by pistons supported with fluid pressure
Assignee: Beloit Corp
•
Filing: 1970-11-19
•
Granted: 1973-07-24
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Expires: 1990-11-19
Abstract
Abstract An extended nip press device for removing fluids from a fibrous web and including a pair of endless looped non-porous belts positioned to define a nip of at least 6 inches in length. A porous belt or felt is positioned to pass through the nip and is used as a web carrying device. The pressure exerted in the nip is caused by a piston positioned inside the loop of each of the nonporous belts having a force transmitting surface contacting the nonporous belts substantially across the width and length of the nip. Lubrication lines are provided for each piston so as to lubricate the surface contacting the nonporous belt. Deflection control structure defining a fluid reservoir and positioned to accept one of the pistons in each reservoir is further provided, and includes feed lines for supplying fluid to the reservoir in an amount sufficient to support the piston in the reservoir. Force supplied by the piston on the nonporous belt is balanced by the deflection control structure so as to prevent deflection of the piston.
Inventors
- 👤 L Busker
- 👤 C Francik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:08
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/0209
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 1: wherein said means supporting each of said force applying means includes deflection control means including a fluid pressure backing chamber means for the force applying means extending laterally of the direction of belt travel across the force applying means and applying a fluid pressure backing thereto at uniform force across the force applying means so that substantial bending of the force applying means is prevented.
Claim 2
Dependent Claim
65 words
An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 2: wherein said force applying means is in the form of a piston, and the deflection control means is in the form of a reservoir with the piston slidably mounted in the reservoir, with means to pressurize the reservoir to provide said fluid pressure backing to the piston.
Claim 3
Dependent Claim
40 words
An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 3: wherein conduit means are provIded communicating between said reservoir and said chamber for each of said first and second force applying means.
Claim 4
Dependent Claim
56 words
An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 3. wherein said means for delivering pressurized fluid to the chambers is connected to said reservoir and said chambers are supplied by conduit means communicating between said reservoir and said chamber of each of said stationary force applying means.
Claim 5
Dependent Claim
31 words
An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 1: and including lubricating means for the sealing surfaces of the force applying means.
Claim 6
Dependent Claim
38 words
An extended nip press for removing water from a traveling fibrous web constructed in accordance with claim 1: wherein said water receiving means comprises a looped traveling belt passing through the nip between said belts with the web.
Claim 7
Dependent Claim
194 words
An extended nip press for removing water from a traveling fibrous web comprising: first and second web pressing means on each side of the web forming a nip supporting and pressing water from a web carried therebetween, at least one of said pressing means including: a looped nonporous flexible belt, guide means within the belt guiding its travel to said nip, a stationary force applying means defining a pressure chamber with an opening exposed to the inner surface of the belt at said nip, said force applying means having sealing surfaces surrounding said opening at the leading and trailing edges of the opening end at each side thereof sealingly engaging said belt, means for delivering pressurized fluid to said chamber so that fluid pressure is applied at said opening to the belt to be transmitted to the web, deflection control means including a fluid pressure backing chamber means for the force applying means extending laterally of the direction of belt travel and applying a fluid pressure backing to the force applying means at a uniform force; and water receiving means for through the nip with the web to receive water pressed from the web.
References Cited (Backward Citations)
US1539542A
Cited
BE525788A
Cited
US2928464A
Cited
US3215065A
Cited
US3293121A
Cited
US3269893A
Cited
US3454463A
Cited
US3556939A
Cited
US3586602A
Cited
US3620158A
Cited
US3562106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |