US3812598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drying damp web material
Assignee: Omnium de Prospective Industrielle SA
•
Filing: 1973-01-24
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Granted: 1974-05-28
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Expires: 1993-01-24
Abstract
Abstract Apparatus for drying damp web material having a distribution chamber with inlet and outlet slots through which the material is moved, the chamber having means for receiving compressed gas to which the material is subjected for uniform drying.
Inventors
- 👤 M Lefebvre
- 👤 P Lapierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:53
CPC Classifications
D; D06; D06B; D06B15/00; D06B15/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
Apparatus for pneumatically drying a web of porous damp material moving through said apparatus in a predetermined direction, said apparatus comprising first and second frame elements, said first frame element including means for providing a web engaging surface along which the web being dried moves during operation of the apparatus and said second frame element including means cooperating with said web engaging surface for forming an air distribution chamber in said apparatus through which said web moves, and an air supply chamber formed therein in communication with said air distribution chamber for uniformly supplying pressurized air from a source thereof to said distribution chamber; said frame elements being spaced from each other a predetermined distance to define therebetween inlet and outlet slots on opposite sides of said distribution chamber transversely to the direction of movement of said web through the apparatus and through which said web passes, said slots having a height dimension selected to be substantially equal to the thickness of the web being treated, whereby pressurized air supplied to said distribution chamber is forced into the web to escape from said distribution chamber through said slots, thereby to remove liquid from said web.
Claim 2
Dependent Claim
195 words
Apparatus for pneumatically drying a web of porous damp material moving through said apparatus in a predetermined direction, said apparatus comprising first and second frame elements, said first frame element including means for providing a web engaging surface along which the web being dried moves during operation of the apparatus and said second frame element including means cooperating with said web engaging surface for forming an air distribution chamber in said apparatus through which said web moves, and an air supply chamber formed therein in communication with said air distribution chamber for uniformly supplying pressurized air from a source thereof to said distribution chamber; said frame elements being spaced from each other a predetermined distance to define therebetween inlet and outlet slots on opposite sides of said distribution chamber transversely to the direction of movement of said web through the apparatus and through which said web passes, said slots having a height dimension selected to be substantially equal to the thickness of the web being treated, whereby pressurized air supplied to said distribution chamber is forced into the web to escape from said distribution chamber through said slots, thereby to remove liquid from said web.
Claim 3
Dependent Claim
42 words
The apparatus as defined in claim 1 wherein said web engaging surface is substantially air-impervious whereby said pressurized air squeezes said web in said distribution chamber forcing liquid out of the web and through said slots as the pressurized air escapes therefrom.
Claim 4
Dependent Claim
63 words
The apparatus as defined in claim 1 wherein said first and second frame elements include substantially superimposed spaced wall pOrtions defining said inlet and outlet slots, at least one of said wall portions having a plurality of grooves formed therein extending transversely of the direction of travel of said web whereby transversely extending baffles are defined in said at least one wall portion.
Claim 5
Dependent Claim
73 words
The apparatus as defined in claim 1 wherein said first and second frame elements include opposed wall portions extending generally parallel to the path of travel of said web through the apparatus and on opposite sides thereof, said opposed wall portions being spaced from each other to define auxiliary slots in said apparatus which receive edge portions of said web and permit escape of part of the pressurized air from said distribution chamber.
Claim 6
Dependent Claim
79 words
The apparatus as defined in claim 1 wherein said means providing said web engaging surface is mounted in said first frame element for movement with respect to said second frame element in a direction generally perpendicular to the plane of said surface, under the influence of the pressurized air in said distribution chamber; and means for producing an auxiliary balancing force for maintaining said web engaging surface in a predetermined balanced position with respect to said second frame element.
Claim 7
Dependent Claim
25 words
The apparatus as defined in claim 5 wherein said means providing said web engaging surface is formed of a flexible material and is locally deformable.
Claim 8
Dependent Claim
32 words
The apparatus as defined in claim 5 wherein said means for producing said auxiliary balancing force includes means for regulating said force as a function of the pressure in the distribution chamber.
Claim 9
Dependent Claim
60 words
The apparatus as defined in claim 5 wherein said first frame element has an auxiliary air chamber formed therein adapted to be connected to a source of pressurized air and located adjacent said means providing said web engaging surface, and on the opposite side thereof from said surface, whereby the air pressure in said auxiliary chamber produces said balancing force.
Claim 10
Dependent Claim
69 words
The apparatus as defined in claim 8 wherein said means providing said web engaging surface has a plurality of apertures therein providing air communication between said auxiliary chamber and said air distribution chamber whereby air in said auxiliary chamber escapes therefrom through said apertures in accordance with the air pressure in said distribution chamber, thereby to vary the pressure in said auxiliary chamber and the balancing foce produced thereby.
Claim 11
Dependent Claim
170 words
The apparatus as defined in claim 1 wherein said first frame element has an auxiliary air chamber formed therein opening towards said air distribution chamber and said means providing said web engaging surface comprises a plate formed of a flexible material movably mounted in said first frame adjacent said auxiliary air chamber for movement towards and away from said second frame element, said auxiliary air chamber being operatively connected to a source of air whereby an auxiliary balancing force is produced on said plate for maintaining said web engaging surface in a predetermined balanced position with respect to said air distribution chamber under the influence of the air pressure in said air distribution chamber; said plate having a plurality of apertures therein providing air communication between said auxiliary chamber and said air distribution chamber whereby air in said auxiliary chamber escapes therefrom through said apertures in accordance with the air pressure in said distribution chamber, thereby to vary the pressure in said auxiliary chamber and the balancing force produced thereby.
References Cited (Backward Citations)
US3230636A
Cited
US3096161A
Cited
US3143396A
Cited
US3199224A
Cited
US3416237A
Cited
US3435751A
Cited
US3447247A
Cited
US3524265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |