US3895449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air impingement system
Assignee: Beloit Corp
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Filing: 1973-12-14
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Granted: 1975-07-22
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Expires: 1993-12-14
Abstract
Abstract Method and apparatus for drying a moving web of paper or the like including one or more impingement boxes which are disposed in spaced relation to the moving web, with means for introducing pressurized air into each of the impingement boxes, each of the boxes including an apertured plate spaced from the web being dried, the plate having relatively small diameter holes centrally thereof and relatively larger diameter holes along the leading and trailing edges to minimize cross flow interference with exhaust spaces being provided along the leading and trailing edges for directing spent drying air into an exhaust plenum.
Inventors
- 👤 James L Chance
- 👤 Shu Tang Han
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:13
CPC Classifications
F; F26; F26B; F26B21/00; F26B21/50; D; D21; D21F; D21F5/00; D21F5/02; D21F5/18; F26B13/00; F26B13/10; F26B13/101; F26B13/104; F26B21/55
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
An apparatus for drying a moving web comprising a housing, an smoothly curved apertured plate closing off the housing and extending the width of said web, means for introducing pressurized air into said housing for flow through said plate, and exhaust means extending the width of said web for exhausting spent air at the edges of the plate, the apertures in said plate including small diameter holes normal to the plane of the web located centrally of said plate and larger diameter holes normal to the plane of the web located at the edges of said plate and in close proximity and parallel to said exhaust means, the smaller diameter holes being in closer proximity to the web than the larger diameter holes so that increased volume of cross flow spent air occurs at the plate edge at the location of the larger holes with higher volume air jets.
Claim 2
Independent Claim
149 words
An apparatus for drying a moving web comprising a housing, an smoothly curved apertured plate closing off the housing and extending the width of said web, means for introducing pressurized air into said housing for flow through said plate, and exhaust means extending the width of said web for exhausting spent air at the edges of the plate, the apertures in said plate including small diameter holes normal to the plane of the web located centrally of said plate and larger diameter holes normal to the plane of the web located at the edges of said plate and in close proximity and parallel to said exhaust means, the smaller diameter holes being in closer proximity to the web than the larger diameter holes so that increased volume of cross flow spent air occurs at the plate edge at the location of the larger holes with higher volume air jets.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1 in which the diameter of said holes and their spacing from the web is such that the spacing of any given hole from the web is not greater than four times its diameter.
Claim 4
Independent Claim
188 words
An apparatus for drying a moving web moving in the direction of the length of the web comprising a housing, an apertured plate closing off the housing and extending in a direction across the width of the web, means for introducing pressurized air into said housing for flow through said plate, and exhaust means extending across the width of said web at the leading and trailing edges of said plate relative to the direction of web movement for exhausting spent air, the apertures in said plate including small diameter holes normal to the plane of the web located centrally of said plate and larger diameter holes normal to the plane of the web located at the edges of said plate with the smaller and larger diameter holes respectively each being of a uniform size in a direction across the width of the web so that a uniform drying effect is had by the web across its width due to the air flow against the moving web, the larger diameter holes being located at the areas of higher volume of spent air flow at the edges of the plate.
Claim 5
Independent Claim
188 words
An apparatus for drying a moving web moving in the direction of the length of the web comprising a housing, an apertured plate closing off the housing and extending in a direction across the width of the web, means for introducing pressurized air into said housing for flow through said plate, and exhaust means extending across the width of said web at the leading and trailing edges of said plate relative to the direction of web movement for exhausting spent air, the apertures in said plate including small diameter holes normal to the plane of the web located centrally of said plate and larger diameter holes normal to the plane of the web located at the edges of said plate with the smaller and larger diameter holes respectively each being of a uniform size in a direction across the width of the web so that a uniform drying effect is had by the web across its width due to the air flow against the moving web, the larger diameter holes being located at the areas of higher volume of spent air flow at the edges of the plate.
Claim 6
Dependent Claim
38 words
The apparatus of claim 3 in which the diameter of said holes and their spacing from the web is such that the spacing of any given hole from the web is not greater than four times its diameter.
Claim 7
Dependent Claim
24 words
The apparatus of claim 3 in which the spacing of any given hole from the web is from one to four times its diameter.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |