US3624353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying cylinder
Assignee: Tampella Oy AB
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Filing: 1970-04-28
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Granted: 1971-11-30
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Expires: 1990-04-28
Abstract
Abstract Drying cylinder for paper webs and equivalent having a rotatable cylindrical mantle, to the inside of which there have been attached several coaxially arranged annular heating elements. The heating elements are electrical resistances which are separately adjustable for achievement of desired temperature profile across the mantle surface of the drying cylinder.
Inventors
- 👤 Nils G H Bjorklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:44
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/0095; F; F26; F26B; F26B13/00; F26B13/10; F26B13/14; F26B13/18; F26B13/183
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A drying cylinder for paper webs comprising: a rotatable cylinder having an axis of rotation and a cylindrical mantle wall with a plurality of separate, nonoverlapping axial, annular regions located along the inner surface of said mantle wall and encircling said axis of rotation, each of said annular regions having attached thereto a separate, coaxial, annular electrical resistance, each said resistance forming a substantially continuous ring around said axis of rotation; and control means providing a separate adjustable electrical current to each of said resistances for providing an axial temperature gradient along said mantle wall.
Claim 2
Dependent Claim
95 words
A drying cylinder for paper webs comprising: a rotatable cylinder having an axis of rotation and a cylindrical mantle wall with a plurality of separate, nonoverlapping axial, annular regions located along the inner surface of said mantle wall and encircling said axis of rotation, each of said annular regions having attached thereto a separate, coaxial, annular electrical resistance, each said resistance forming a substantially continuous ring around said axis of rotation; and control means providing a separate adjustable electrical current to each of said resistances for providing an axial temperature gradient along said mantle wall.
Claim 3
Dependent Claim
22 words
The drying cylinder in claim 1 wherein said control means additionally includes one axially extending electrical connection for each of said resistances.
Claim 4
Dependent Claim
18 words
The drying cylinder in claim 1 wherein each said electrical resistance comprises a plurality of series connected rods.
Claim 5
Dependent Claim
158 words
A drying cylinder for paper webs comprising: a rotatable cylinder having an axis of rotation and a cylindrical mantle wall with a plurality of separate nonoverlapping axial annular regions located along the inner surface of said mantle wall and encircling said axis of rotation, each of said annular regions having attached thereto a separate, coaxial, annular electrical resistance, each said resistance forming a substantially continuous ring around said axis of rotation; journal pins coaxial with said cylinder and integrally fitted to end pieces attached to both ends of said cylinder; a plurality of contact rings upon at least one journal pin, said contact rings being electrically connected to separate resistances; a slide contact mounted in sliding contact with each said contact ring; and an external, adjustable source of current connected to each of said slide contacts for supplying a separate adJustable electrical current to each of said resistances for producing an axial temperature gradient along said mantle wall.
Claim 6
Dependent Claim
158 words
A drying cylinder for paper webs comprising: a rotatable cylinder having an axis of rotation and a cylindrical mantle wall with a plurality of separate nonoverlapping axial annular regions located along the inner surface of said mantle wall and encircling said axis of rotation, each of said annular regions having attached thereto a separate, coaxial, annular electrical resistance, each said resistance forming a substantially continuous ring around said axis of rotation; journal pins coaxial with said cylinder and integrally fitted to end pieces attached to both ends of said cylinder; a plurality of contact rings upon at least one journal pin, said contact rings being electrically connected to separate resistances; a slide contact mounted in sliding contact with each said contact ring; and an external, adjustable source of current connected to each of said slide contacts for supplying a separate adJustable electrical current to each of said resistances for producing an axial temperature gradient along said mantle wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |