US3650892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stock tank sealing means for papermaking
Assignee: Feldmuehle AG
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Filing: 1969-07-11
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Granted: 1972-03-21
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Expires: 1989-07-11
Abstract
Abstract The screen inlet to the stock tank is sealed to prevent loss of stock water by a water chamber. The seal water pressure is adjustable. The chamber is sealed with reference to the screen by two rollers each of which is in close proximity to but not in contact with an opposite side of the screen and is driven in either direction at variable speed. The gap between rollers and screen is adjustable to accommodate different screen gages, different concentrations of fiber suspension, different stock levels and other operating conditions.
Inventors
- 👤 Heinz Genz
- 👤 Heinz Liborius
- 👤 Dieter Pfleiderer
- 👤 Karl Schmidt
- 👤 Dieter Berger
- 👤 Horst Seeliger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:22
CPC Classifications
D; D21; D21F; D21F9/00; D21F9/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
Apparatus including a stock tank having an opening in one wall which is below the stock level in said tank and an inclined endless wire screen passing upwardly through the opening for producing non-woven fabrics by depositing fibers from water-fiber stock in the tank on the screen as it moves up through the tank and means for preventing the loss of stock water through the opening comprising: a seal chamber around and below the opening for holding sealing water under pressure and sealing means comprising a pair of rolls forming a portion of a wall of the chamber on opposite sides of the screen as it enters the chamber below the stock tank opening, the rolls lying opposite each other in close proximity to but not touching the surfaces of the screen and means connected to the rolls for rotating them in the direction of wire screen travel to retain the seal water in the chamber.
Claim 2
Dependent Claim
156 words
Apparatus including a stock tank having an opening in one wall which is below the stock level in said tank and an inclined endless wire screen passing upwardly through the opening for producing non-woven fabrics by depositing fibers from water-fiber stock in the tank on the screen as it moves up through the tank and means for preventing the loss of stock water through the opening comprising: a seal chamber around and below the opening for holding sealing water under pressure and sealing means comprising a pair of rolls forming a portion of a wall of the chamber on opposite sides of the screen as it enters the chamber below the stock tank opening, the rolls lying opposite each other in close proximity to but not touching the surfaces of the screen and means connected to the rolls for rotating them in the direction of wire screen travel to retain the seal water in the chamber.
Claim 3
Dependent Claim
31 words
Apparatus according to claim 1 wherein the roll rotating means includes means for rotating the peripheries of the rolls at a faster rate than the speed of travel of the screen.
Claim 4
Dependent Claim
39 words
Apparatus according to claim 1 wherein there is a scraper device for each roll defining a wall of the chamber and engaging the surface of its roll for sealing the chamber against the passage of water past the roll.
Claim 5
Dependent Claim
20 words
Apparatus according to claim 1 wherein there are means for adjusting the spacing of the rolls from the wire screen.
Claim 6
Dependent Claim
46 words
Apparatus according to claim 1 wherein the roll Rotating means include means for rotating the peripheries of the rolls at a faster rate than the speed of travel of the screen and there are means for adjusting the spacing of the rolls from the wire screen.
Claim 7
Dependent Claim
39 words
Apparatus according to claim 5 wherein there is a scraper device for each roll defining a wall of the chamber which engages the surface of its roll for sealing the chamber against the passage of water past the roll.
Claim 8
Dependent Claim
46 words
Apparatus according to claim 6 wherein the means for rotating the rolls in the direction of travel of the wire screen includes means for varying the speed of rotation of the rolls to suit various operation conditions, and means for rotating them in the reverse direction.
References Cited (Backward Citations)
US2873597A
Cited
US2918069A
Cited
US3190790A
Cited
US3351348A
Cited
US3306594A
Cited
US3291468A
Cited
US3440136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |