Patent US4390433A successfully refreshed from Google Patents.
US4390433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewatering system with water deckle
Assignee: Albany International Corp
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Filing: 1981-11-09
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Granted: 1983-06-28
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Expires: 2001-11-09
Abstract
Abstract A deliquefying system including at least one drainage device having a wear surface and being connected to a source of suction open to the wear surface. A wet web of material to be deliquefied is passed over the wear surface so that liquid is removed from the wet web of material by the drainage device. A liquid deckle is at each exposed end of the drainage device in position to prevent air from entering the drainage device through the end zone and thereby restricting the flow of air to passage through the wet web into the drainage device.
Inventors
- 👤 Jeffrey B. Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:47
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/48; D21F1/52; D21F1/483
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
111 words
In a deliquefying system including at least one drainage device having a wear surface and connected to a source of suction open to the wear surface and means for passing a wet web of material to be deliquefied over the wear surface so that liquid is removed from the web by the drainage device, the improvement comprising; a liquid deckle including means for injecting liquid under relatively high pressure into a substantial space at each end of the drainage device in position to prevent air from entering the drainage device through the end zone and thereby restricting the flow of air to passage through the wet web into the drainage device.
Claim 2
Dependent Claim
111 words
In a deliquefying system including at least one drainage device having a wear surface and connected to a source of suction open to the wear surface and means for passing a wet web of material to be deliquefied over the wear surface so that liquid is removed from the web by the drainage device, the improvement comprising; a liquid deckle including means for injecting liquid under relatively high pressure into a substantial space at each end of the drainage device in position to prevent air from entering the drainage device through the end zone and thereby restricting the flow of air to passage through the wet web into the drainage device.
Claim 3
Dependent Claim
45 words
The invention in accordance with claim 1 wherein the deliquefying system includes papermaking machinery to dewater the wet web of material, a Fourdrinier wire supporting the wet web of material as it passes over the drainage device, and the wear surface being a bladed surface.
Claim 4
Dependent Claim
85 words
The invention in accordance with claim 2 wherein the liquid deckle is located at both transverse edges of the drainage device and includes means for injecting water into the space between the Fourdrinier wire and the drainage device thereby substantially restricting the passage of air into the drainage box to air drawn by the suction source through the Fourdrinier wire and wet web of material thereover and substantially eliminating leakage of air into the drainage box through the end zone formed at each transverse edge.
Claim 5
Dependent Claim
62 words
The invention in accordance with claim 2 wherein each bladed surface is formed with a leading beveled edge extending in a horizontal surface in the direction of travel of the wet web of material and terminating in a recess open to the source of suction through which suction is applied to remove water collected from the wet web of material passing thereover.
Claim 6
Dependent Claim
39 words
The invention in accordance with claim 2 wherein the liquid deckle is formed by injecting water under high pressure at each exposed transverse edge of the bladed surface from the downstream end of the blade in the upstream direction.
Claim 7
Dependent Claim
61 words
The invention in accordance with claim 2 wherein the liquid deckle is formed at each exposed transverse edge of the drainage device by injecting water at low pressure along each exposed transverse edge of the drainage device from the upstream end of the blade in a downstream direction with respect to the direction of travel of the wet web of material.
Claim 8
Dependent Claim
59 words
The invention in accordance with claim 2 wherein the liquid deckle is produced by injecting water through a transverse groove in the wear surface of the drainage device at the upstream end of the groove and following the groove to the downstream end in a direction substantially parallel to the direction of travel of the wet web of material.
Claim 9
Dependent Claim
116 words
The invention in accordance with claim 2 wherein the bladed surface of the drainage device includes a beveled tip at the upstream end extending in the downstream direction in the form of a horizontal wear surface engaged by the Fourdrinier wire followed by a recess downstream of the engaging wear surface to form a space between the Fourdrinier wire and the drainage device, the liquid deckle being formed by injecting liquid into the recess between the wire and the adjacent surface of the drainage device continuously and in a direction parallel with respect to the direction of travel of the wire with respect to the drainage device at each exposed transverse edge of the drainage device.
Claim 10
Dependent Claim
66 words
The invention in accordance with claim 2 wherein there are a plurality of drainage devices with bladed surfaces thereon arranged consecutively in the direction of travel of the wire and having their longitudinal dimension transverse to the direction of flow of the wire, and a liquid source provided to introduce liquid to each exposed transverse edge of each drainage device to form a liquid deckle thereon.
Claim 11
Independent Claim
123 words
A method for preventing air from entering the end zones of a drainage device used in a deliquefying system comprising; providing at least one drainage device having a wear surface, connecting the drainage device to a source of suction open to the wear surface, passing a wet web of material to be deliquefied over the wear surface so that liquid is removed from the web by the drainage device, and forming a liquid deckle by injecting liquid under relatively high pressure into a substantial space at each end of the drainage device in position to prevent air from entering the drainage device through the end zone and thereby restricting the flow of air to passage through the wet web into the drainage device.
Claim 12
Independent Claim
123 words
A method for preventing air from entering the end zones of a drainage device used in a deliquefying system comprising; providing at least one drainage device having a wear surface, connecting the drainage device to a source of suction open to the wear surface, passing a wet web of material to be deliquefied over the wear surface so that liquid is removed from the web by the drainage device, and forming a liquid deckle by injecting liquid under relatively high pressure into a substantial space at each end of the drainage device in position to prevent air from entering the drainage device through the end zone and thereby restricting the flow of air to passage through the wet web into the drainage device.
Claim 13
Dependent Claim
45 words
The invention in accordance with claim 10 wherein the deliquefying system includes papermaking machinery to dewater the wet web of material, a Fourdrinier wire supporting the wet web of material as it passes over the drainage device, and the wear surface being a bladed surface.
Claim 14
Dependent Claim
84 words
The invention in accordance with claim 11 wherein the liquid deckle is located at both transverse edges of the drainage device and is formed by injecting water into the space between the Fourdrinier wire and the drainage device thereby substantially restricting the passage of air into the drainage box to air drawn by the suction source through the Fourdrinier wire and wet web of material and substantially eliminating leakage of air into the drainage box through the end zones formed at each transverse edge.
Claim 15
Dependent Claim
62 words
The invention in accordance with claim 11 wherein each blade surface is formed with a leading beveled edge extending in a horizontal surface in the direction of travel of the wet web of material and terminating in a recess open to the source of suction through which suction is applied to remove water collected from the wet web of material passing thereover.
Claim 16
Dependent Claim
39 words
The invention in accordance with claim 11 wherein the liquid deckle is formed by injecting water under high pressure at each exposed transverse edge of the bladed surface from the downstream end of the blade in the upstream direction.
Claim 17
Dependent Claim
61 words
The invention in accordance with claim 11 wherein the liquid deckle is formed at each exposed transverse edge of the drainage device by injecting water at low pressure along each exposed transverse edge of the drainage device from the upstream end of the blade in a downstream direction with respect to the direction of travel of the wet web of material.
Claim 18
Dependent Claim
59 words
The invention in accordance with claim 11 wherein the liquid deckle is produced by injecting water through a transverse groove in the wear surface of the drainage device at the upstream end of the groove and following the groove to the downstream end in a direction substantially parallel to the direction of travel of the wet web of material.
Claim 19
Dependent Claim
116 words
The invention in accordance with claim 11 wherein the bladed surface of the drainage device includes a beveled tip at the upstream end extending in the downstream direction in the form of a horizontal wear surface engaged by the Fourdrinier wire followed by a recess downstream of the engaging wear surface to form a space between the Fourdrinier wire and the drainage device, the liquid deckle being formed by injecting liquid into the recess between the wire and the adjacent surface of the drainage device continuously and in a direction parallel with respect to a direction of travel of the wire with respect to the drainage device at each exposed transverse edge of the drainage device.
Claim 20
Dependent Claim
66 words
The invention in accordance with claim 11 wherein there are a plurality of drainage devices with bladed surfaces thereon arranged consecutively in the direction of travel of the wire and having their longitudinal dimension transverse to the direction of flow of the wire, and a liquid source provided to introduce liquid to each exposed transverse edge of each drainage device to form a liquid deckle thereon.
References Cited (Backward Citations)
US1534948A
Cited
US2101109A
Cited
US2345647A
Cited
US3468424A
Cited
US3607624A
Cited
US3839148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |