Patent US4004968A successfully refreshed from Google Patents.
US4004968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Consecutive multi-ply formers with an unencumbered doffer felt
Assignee: Sulzer Escher Wyss GmbH
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Filing: 1975-05-27
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Granted: 1977-01-25
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Expires: 1995-05-27
Abstract
Abstract A wire is passed over the suction breast roll between the formed paper web and the doffer belt or the previously formed paper webs and doffer belt. The doffer felt is disposed in an unencumbered fashion over each of a plurality of consecutive suction breast rolls. The wire is removed from the web at a downstream point outside the dewatering influence of each breast roll. Stripping of the wire from the paper web is aided by various suction devices or couch rolls at this latter point.
Inventors
- 👤 Heinz Braun
- 👤 Hans Dahl
- 👤 Jost Hefter
- 👤 Wolf-Gunter Stotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:11
CPC Classifications
D; D21; D21F; D21F11/00; D21F11/06; D21F11/08; D21F9/00; D21F9/04; Y; Y10; Y10S; Y10S162/00; Y10S162/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A paper machine comprising a plurality of consecutively disposed formers, each former including a breast box, a suction breast roll and at least one suction box in said roll for dewatering a paper web formed by said former under negative pressure; a doffer felt extending between said formers over each said suction breast roll of each former in unencumbered fashion; a plurality of guide rolls about each said former; and a long wire extending about each said breast roll and the related guide rolls, said wire having a portion extending along said doffer felt to dispose the formed paper web therebetween.
Claim 2
Dependent Claim
101 words
A paper machine comprising a plurality of consecutively disposed formers, each former including a breast box, a suction breast roll and at least one suction box in said roll for dewatering a paper web formed by said former under negative pressure; a doffer felt extending between said formers over each said suction breast roll of each former in unencumbered fashion; a plurality of guide rolls about each said former; and a long wire extending about each said breast roll and the related guide rolls, said wire having a portion extending along said doffer felt to dispose the formed paper web therebetween.
Claim 3
Dependent Claim
166 words
A paper machine comprising a plurality of consecutively disposed formers, each former including a breast box, a suction breast roll, at least one suction box in said roll for dewatering a paper web formed by said former under negative pressure and a water box downstream of said roll to receive water; a doffer felt extending between said formers, said doffer felt being disposed over each said suction breast roll or each former in unencumbered fashion to receive a fresh web so that the resulting paper web is guided over said breast roll in a non-pressed condition; a plurality of guide rolls about each said former; a long wire extending about each said breast roll and the related guide rolls in an endless path, said wire having a portion extending along said doffer felt to dispose the formed paper web therebetween for gravity dewatering of the web; and a dewatering means within each said water box adjacent to said wire portion for removing water from said wire.
Claim 4
Dependent Claim
166 words
A paper machine comprising a plurality of consecutively disposed formers, each former including a breast box, a suction breast roll, at least one suction box in said roll for dewatering a paper web formed by said former under negative pressure and a water box downstream of said roll to receive water; a doffer felt extending between said formers, said doffer felt being disposed over each said suction breast roll or each former in unencumbered fashion to receive a fresh web so that the resulting paper web is guided over said breast roll in a non-pressed condition; a plurality of guide rolls about each said former; a long wire extending about each said breast roll and the related guide rolls in an endless path, said wire having a portion extending along said doffer felt to dispose the formed paper web therebetween for gravity dewatering of the web; and a dewatering means within each said water box adjacent to said wire portion for removing water from said wire.
Claim 5
Dependent Claim
96 words
A paper machine as set forth in claim 2 wherein said wire disengages from said breast roll at a predetermined place and wherein said suction box within said roll is disposed in a sheet-forming zone of said breast roll, and at least a second suction box is disposed within the breast roll and downstream of said first suction box, said second suction box terminating at a point downstream of said place where said wire disengages from said breast roll whereby water hurled from said breast roll is hurled clear of said wire into said water box.
Claim 6
Dependent Claim
49 words
A paper machine as set forth in claim 3 wherein said wire is disengaged from the formed paper web downstream of each former and further comprising means downstream of each said former for boosting disengagement of the formed paper web from said wire at one end of said portion.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |