US3634948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drying apparatus for papermaking
Assignee: Individual
•
Filing: 1970-08-20
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Granted: 1972-01-18
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Expires: 1990-08-20
Abstract
Abstract A web-drying apparatus having a hood enclosing two parallel transverse rows of drying cylinders set one above the other at a considerable distance from each other, each web run between the upper and lower rows of drying cylinders being lined on either side with a vertical row of jet boxes each of which has a convex profile along the side facing the web and which alternate in position with the jet boxes in the opposite row, so that the web will be dried on the drying cylinders and also as it runs in a wavy path from one row of drying cylinders to the next, while the web is exposed to a hot blast from the convex side of each jet box on both sides of the web, but without touching the jet boxes.
Inventors
- 👤 Tadashi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:52
CPC Classifications
F; F26; F26B; F26B13/00; F26B13/10; F26B13/101; F26B13/104; D; D21; D21F; D21F5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
253 words
A drying apparatus for papermaking, comprising a closed hood, two parallel upper and lower horizontal rows of drying cylinders installed therein one above the other at a considerable vertical distance from each other, the drying cylinders in each of said upper and lower horizontal rows being arranged transversely at regular intervals in positions alternating with those of the drying cylinders in the other horizontal row defining vertical web travel paths between said horizontal rows so that a wet web to be dried may be routed from one drying cylinder in one horizontal row to the next drying cylinder in the other horizontal row, thus shuttling between said upper and lower horizontal rows along said travel paths, and pairs of vertical rows of jet boxes lining said travel paths between said upper and lower horizontal rows of drying cylinders, the jet boxes in each of said paired vertical rows being offset one from the other alternating vertically with those in the other vertical row, and each of said jet boxes having a convex profile vertically along the side thereof that faces the web travel paths, said convex profile at one row being nested in the corresponding convex profile of the other row and disposed to blow a hot blast onto a web passing along said travel path from each of said jet boxes causing said web to run in a wavy course form one row of drying cylinders to the other, said hot blasts and said drying cylinders thus combining to dry said web.
Claim 2
Dependent Claim
253 words
A drying apparatus for papermaking, comprising a closed hood, two parallel upper and lower horizontal rows of drying cylinders installed therein one above the other at a considerable vertical distance from each other, the drying cylinders in each of said upper and lower horizontal rows being arranged transversely at regular intervals in positions alternating with those of the drying cylinders in the other horizontal row defining vertical web travel paths between said horizontal rows so that a wet web to be dried may be routed from one drying cylinder in one horizontal row to the next drying cylinder in the other horizontal row, thus shuttling between said upper and lower horizontal rows along said travel paths, and pairs of vertical rows of jet boxes lining said travel paths between said upper and lower horizontal rows of drying cylinders, the jet boxes in each of said paired vertical rows being offset one from the other alternating vertically with those in the other vertical row, and each of said jet boxes having a convex profile vertically along the side thereof that faces the web travel paths, said convex profile at one row being nested in the corresponding convex profile of the other row and disposed to blow a hot blast onto a web passing along said travel path from each of said jet boxes causing said web to run in a wavy course form one row of drying cylinders to the other, said hot blasts and said drying cylinders thus combining to dry said web.
Claim 3
Dependent Claim
83 words
A drying apparatus for papermaking as claimed in claim 1, wherein the web to be dried is routed from one transverse row of drying cylinders to the other via a guide roll installed between each upper drying cylinder and the top of each pair of vertical rows of jet boxes below said upper drying cylinder and via a guide roll installed between each lower drying cylinder and the bottom of each paiR of vertical rows of jet boxes above said lower drying cylinder.
Claim 4
Dependent Claim
75 words
A drying apparatus for papermaking as claimed in claim 1, wherein said hood has wet and dry ends and at the wet end of the hood the web is first routed around the first drying cylinder in the lower row and goes up, whereas at the dry end the web travels downward between the last pair of vertical rows of jet boxes, at the end of which said web is led out of said hood.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |