US3816941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drier section
Assignee: Escher Wyss Maschinenfabriken GmbH
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Filing: 1973-03-12
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Granted: 1974-06-18
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Expires: 1993-03-12
Abstract
Abstract Drier section for drying a material web, having two superimposed rows of cylinders; said material web travelling alternating from row to row, partially wrapping said cylinders; each two of said cylinders, following one another in the direction of travel of said material web being partially wrapped by different ones of contact webs; the first, in said direction of travel, of said contact webs and the second of said contact webs being so guided as to extend for a length on both the sides of said material web in the immediate vicinity to said material web.
Inventors
- 👤 H Holik
- 👤 E Muehle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:17
CPC Classifications
D; D21; D21F; D21F5/00; D21F5/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
In a drier section of the type in which a traveling web of paper or like material to be dried partially wraps in sequence a plurality of cylinders arranged in two superposed rows and alternates between the rows as it transfers from each cylinder to the next in the direction of travel, and in which the cylinders are also partially wrapped by moving contact webs which are arranged so that a different contact web wraps adjacent cylinders in the direction of travel of said material web, the improvement which comprises guiding means for the contact webs which causes the contact webs associated with each pair of adjacent cylinders, in the direction of travel of said material web, to traverse paths immediately adjacent to and at opposite sides of the material web for at least a portion of the region in which the material web transfers cylinders, the contact webs overlapping in said portion of the transfer region so that they define a guide gap means through which the material web passes as it travels between cylinders and thereby serve to restrict fluttering movement of the material web in a direction normal to its path of travel.
Claim 2
Dependent Claim
196 words
In a drier section of the type in which a traveling web of paper or like material to be dried partially wraps in sequence a plurality of cylinders arranged in two superposed rows and alternates between the rows as it transfers from each cylinder to the next in the direction of travel, and in which the cylinders are also partially wrapped by moving contact webs which are arranged so that a different contact web wraps adjacent cylinders in the direction of travel of said material web, the improvement which comprises guiding means for the contact webs which causes the contact webs associated with each pair of adjacent cylinders, in the direction of travel of said material web, to traverse paths immediately adjacent to and at opposite sides of the material web for at least a portion of the region in which the material web transfers cylinders, the contact webs overlapping in said portion of the transfer region so that they define a guide gap means through which the material web passes as it travels between cylinders and thereby serve to restrict fluttering movement of the material web in a direction normal to its path of travel.
Claim 3
Dependent Claim
18 words
A drier section as defined in claim 1 in which said guide gap means has a constant width.
Claim 4
Dependent Claim
28 words
A drier section as defined in claim 1 in which said guide gap means has a width which decreases in the direction of travel of the material web.
Claim 5
Dependent Claim
29 words
A drier section as defined in claim 1 in which said guide gap means has a width at least twice as great as the thickness of the material web.
Claim 6
Dependent Claim
44 words
A drier section as defined in claim 1 in which the cylinders are perforated wall cylinders; and the guiding means causes the contact webs to bear directly on the cylinders, whereby the material web rests on a contact web as it wraps each cylinder.
Claim 7
Dependent Claim
72 words
A drier section as defined in claim 5 including a solid wall drum which is associated with each of said pairs of adjacent cylinders and which is partially wrapped and in contact with the material web during the course of said transfer; and the guiding means causes one of the contact webs associated with each of said pair of cylinders to rest on the material web as the latter wraps the drum.
Claim 8
Dependent Claim
90 words
A drier section as defined in claim 6 in which there are two solid wall drums associated with each of said pairs of adjacent cylinders, the drums being located at opposite ends of said guide gap means and so arranged that they lead the material web off of and onto the two cylinders, respectively, of each of said cylinder pairs and contact opposite faces of the material web; and the guiding means causes the other contact web to rest on the material web as the latter wraps the second drum.
References Cited (Backward Citations)
US802754A
Cited
US1283888A
Cited
US1595479A
Cited
US1595482A
Cited
US1698818A
Cited
US3303576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |