US3633284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web drying
Assignee: General Electric Canada Co
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Filing: 1970-06-17
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Granted: 1972-01-11
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Expires: 1990-06-17
Abstract
Abstract A paper drier of the conventional drying cylinder-type is provided with air pressure caps, to obviate the need of the presser felts, while pocket ventilation is provided and web wrap angle is increased; together with the provision of improved capsealing arrangements.
Inventors
- 👤 Stephen Anthony Rodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:33
CPC Classifications
F; F26; F26B; F26B13/00; F26B13/10; F26B13/14; F26B13/18; D; D21; D21F; D21F5/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
In a web drying apparatus having a plurality of heated dryer cylinders in spaced arrangement to provide a generally serpentine path for a moving web to pass in drying relation when in operation, the improvement comprising; cap means in airflow control overlying relation with a surface portion of a said cylinder including boundary seal means to seal the edges of said cap relative to the cylinder, to closely limit losses of air from beneath the cap means and to sustain air pressure within the spaced so bounded, and air supply means to supply air at a pressure sufficient to provide pressurized contact between said cylinder and said web, said serpentine path including at least one pocket of tapered section formed between adjacent said cylinders and the web, pocket air supply means located between a said cap and said pocket to limit transfer of air between said pocket and said cap means and to provide ventilating air to the pocket in a direction toward the enlarged portion of said pocket tapered section, whereby the drying capacity of the apparatus is enhanced.
Claim 2
Dependent Claim
180 words
In a web drying apparatus having a plurality of heated dryer cylinders in spaced arrangement to provide a generally serpentine path for a moving web to pass in drying relation when in operation, the improvement comprising; cap means in airflow control overlying relation with a surface portion of a said cylinder including boundary seal means to seal the edges of said cap relative to the cylinder, to closely limit losses of air from beneath the cap means and to sustain air pressure within the spaced so bounded, and air supply means to supply air at a pressure sufficient to provide pressurized contact between said cylinder and said web, said serpentine path including at least one pocket of tapered section formed between adjacent said cylinders and the web, pocket air supply means located between a said cap and said pocket to limit transfer of air between said pocket and said cap means and to provide ventilating air to the pocket in a direction toward the enlarged portion of said pocket tapered section, whereby the drying capacity of the apparatus is enhanced.
Claim 3
Dependent Claim
61 words
The apparatus as claimed in claim 1 wherein said cap boundary seal means includes an arcuate nozzle extending closely adjacent each end of said cylinder, including air supply passage means to provide reverse inward movement of air relative to an edge portion of the surface of the cylinder whereby air pressure on the outer surface of said web may be controlled.
Claim 4
Dependent Claim
63 words
Apparatus as claimed in claim 1, together with web guide means located intermediate said cylinders to increase the wrap of said web about the respective said cylinder and significantly extend tHe arc of wrap of a said web with the cylinder whereby the contact surface of the web with the respective cylinder is increased, and the web path through the apparatus is extended.
Claim 5
Dependent Claim
37 words
Apparatus as claimed in claim 3 wherein said guide means comprise nonrotatable roll means having a perforated arcuate surface, and means to supply air thereto to support said web in air born passage over the roll periphery.
Claim 6
Dependent Claim
80 words
Apparatus as claimed in claim 2 wherein said boundary seal means at the end of said caps each comprises an annular collar extending radially from the end of the respective said cylinder in close spaced relation with said arcuate nozzle, having a radially inwardly directed air nozzle attached in sealing relation to an arcuate portion of the cap adjacent said cylinder end, and air compressor means to circulate sealing air in edge sealing relation between the collar and the cap.
Claim 7
Dependent Claim
40 words
Web-drying apparatus as claimed in claim 3, wherein said guide means is swingably mounted in relation to a said cylinder, whereby the angle of wrap of said web about the cylinder may be varied, and threading of said web facilitated.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |