US5085737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the dewatering of a web of cellulosic matter or a web of material for the pasteboard or cardboard production
Assignee: Andritz AG
•
Filing: 1990-06-08
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Granted: 1992-02-04
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Expires: 2010-06-08
Abstract
Abstract The invention relates to apparatus for the dewatering of a web of cellulosic matter or a web of material for the pasteboard or cardboard production, having endless screen belts or the like circulating in opposite directions between which the web is made to pass for dewatering, the web being made to pass through at least one first dewatering zone with at least two screen belts or the like and thereupon to at least one further dewatering zone, in particular a compresion zone, with at least two screen belts. The invention is mainly characterized in that the web is made to pass at least largely unsupported from at least one dewatering zone serving as a pre-dewatering zone and in particular formed as a double screen belt press to at least one further dewatering zone, in particular to a compression zone in particular formed as a double screen belt press, preferably as a high-pressure press, one or a plurality of heating means, in particular means for applying a heating medium, conveniently one or a plurality of steam-blowing box(es), being provided behind the at least one first dewatering zone serving for pre-dewatering on the web or on the path of the web, in particular above it, one or a plurality of suction site(s), suction box(es) or/and heating means, in particular means for applying a heating medium, conveniently (a) suction box(es), being provided opposite to said steam-blowing box(es) on the other side, in particular underneath, the web or the path of the web, heating means and suction sites conveniently being disposed above and underneath the web opposite to one another and thus forming pairs.
Inventors
- 👤 Edgar Brogyanyi
- 👤 Giselher Stummer
- 👤 Franz P. Kittel
- 👤 Roland Schick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:08
CPC Classifications
D; D21; D21F; D21F3/00; D21F3/02; D21F3/04; D21F3/0272; D21F3/0281
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
209 words
An apparatus for the dewatering of a web of material for the production of pasteboard or cardboard, comprising: endless screen belts and means for circulating said endless screen belts; a first dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said first dewatering zone; a second dewatering zone positioned downstream from said first dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said second dewatering zone; said first and second dewatering zones being dimensioned and arranged so as to provide an open area between said first and second dewatering zones and to pass the web along and without a screen belt through the open area in an unsupported and freely suspended state, and said apparatus being structured and arranged such that the freely suspended web, while passing through the open area, curves downwardly; heating means for heating the web, said heating means being positioned adjacent a first surface of the web and downstream from said first dewatering zone; a dewatering device positioned on an opposite surface of the web and in opposing relationship with said heating means.
Claim 2
Independent Claim
209 words
An apparatus for the dewatering of a web of material for the production of pasteboard or cardboard, comprising: endless screen belts and means for circulating said endless screen belts; a first dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said first dewatering zone; a second dewatering zone positioned downstream from said first dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said second dewatering zone; said first and second dewatering zones being dimensioned and arranged so as to provide an open area between said first and second dewatering zones and to pass the web along and without a screen belt through the open area in an unsupported and freely suspended state, and said apparatus being structured and arranged such that the freely suspended web, while passing through the open area, curves downwardly; heating means for heating the web, said heating means being positioned adjacent a first surface of the web and downstream from said first dewatering zone; a dewatering device positioned on an opposite surface of the web and in opposing relationship with said heating means.
Claim 3
Dependent Claim
29 words
An apparatus according to claim 1 further comprising a second heating means and a second dewatering device positioned upstream, with respect to web passage, from said first dewatering zone.
Claim 4
Dependent Claim
20 words
An apparatus according to claim 1 wherein said heating means includes a heating element positioned within said second dewatering zone.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 1 wherein said heating means includes a heating element positioned downstream from said first dewatering zone and upstream from said second dewatering zone.
Claim 6
Dependent Claim
19 words
The apparatus according to claim 1, wherein said first dewatering zone is formed as a double screen belt press.
Claim 7
Dependent Claim
17 words
The apparatus according to claim 1, wherein said second dewatering zone is formed as a compression zone.
Claim 8
Dependent Claim
18 words
The apparatus according to claim 6, wherein said compression zone is formed as a double screen belt press.
Claim 9
Dependent Claim
16 words
The apparatus according to claim 6, wherein said compression zone is formed as a high-pressure press.
Claim 10
Dependent Claim
14 words
The apparatus according to claim 1, wherein said heating means is a steam-blowing box.
Claim 11
Dependent Claim
15 words
The apparatus according to claim 1, wherein said heating means is arranged above said web.
Claim 12
Dependent Claim
14 words
The apparatus according to claim 1, wherein said dewatering device is a suction site.
Claim 13
Dependent Claim
14 words
The apparatus according to claim 11, wherein said suction site is a suction box.
Claim 14
Dependent Claim
15 words
The apparatus according to claim 11, wherein said suction site is provided underneath said web.
Claim 15
Dependent Claim
17 words
The apparatus according to claim 1, wherein said dewatering device is at least one further heating means.
Claim 16
Dependent Claim
20 words
The apparatus according to claim 14, wherein said further heating means for applying a heating medium is a steam-blowing box.
Claim 17
Dependent Claim
25 words
The apparatus according to claim 11, wherein said heating means and suction site are disposed opposite to one another so as to form a pair.
Claim 18
Dependent Claim
16 words
The apparatus according to claim 1, wherein said heating means is disposed in said open area.
Claim 19
Dependent Claim
16 words
The apparatus according to claim 11, wherein said suction site is disposed in said open area.
Claim 20
Dependent Claim
32 words
The apparatus according to claim 11, wherein said heating means and said suction site are disposed in said open area and said first and second dewatering zones are double screen belt presses.
Claim 21
Dependent Claim
37 words
The apparatus according to claim 1, wherein a gap between the heating means and said dewatering device is provided, said gap being adapted for passage or the web therethrough and said apparatus further comprising gap adjustment means.
Claim 22
Dependent Claim
15 words
The apparatus according to claim 20, wherein said dewatering device is a further heating means.
Claim 23
Dependent Claim
13 words
The apparatus according to claim 20, wherein said dewatering device includes suction means.
Claim 24
Dependent Claim
16 words
The apparatus according to claim 21, wherein said heating means and further heating means are adjustable.
Claim 25
Dependent Claim
17 words
The apparatus according to claim 22, wherein said adjustment means adjusts the position of said suction means.
Claim 26
Dependent Claim
15 words
The apparatus according to claim 24, wherein said suction means is pivotal about an axis.
Claim 27
Dependent Claim
15 words
The apparatus according to claim 23, wherein said heating means is pivotal about an axis.
Claim 28
Independent Claim
182 words
An apparatus for dewatering of a web of cellulosic matter, comprising: endless screen belts and means for circulating said endless screen belts; a first dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said first dewatering zone; a second dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said second dewatering zone; said first and second dewatering zones being dimensioned and arranged so as to provide an open area between said first and second dewatering zones and to pass the web alone and without a screen belt through the open area in an unsupported and freely suspended state; heating means for heating the web, said heating means being positioned downstream, with respect to web passage, at a distance from said first dewatering zone; and wherein said apparatus is structured and arranged such that said part of the web passing unsupported and freely suspended through said open area is curved downward.
Claim 29
Independent Claim
182 words
An apparatus for dewatering of a web of cellulosic matter, comprising: endless screen belts and means for circulating said endless screen belts; a first dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said first dewatering zone; a second dewatering zone with at least two of said screen belts circulating in opposite directions so as to force the web material through and away from said second dewatering zone; said first and second dewatering zones being dimensioned and arranged so as to provide an open area between said first and second dewatering zones and to pass the web alone and without a screen belt through the open area in an unsupported and freely suspended state; heating means for heating the web, said heating means being positioned downstream, with respect to web passage, at a distance from said first dewatering zone; and wherein said apparatus is structured and arranged such that said part of the web passing unsupported and freely suspended through said open area is curved downward.
Claim 30
Dependent Claim
19 words
The apparatus according to claim 27, wherein said first dewatering zone is formed as a double screen belt press.
Claim 31
Dependent Claim
17 words
The apparatus according to claim 27, wherein said second dewatering zone is formed as a compression zone.
Claim 32
Dependent Claim
18 words
The apparatus according to claim 29, wherein said compression zone is formed as a double screen belt press.
Claim 33
Dependent Claim
16 words
The apparatus according to claim 29, wherein said compression zone is formed as a high-pressure press.
Claim 34
Dependent Claim
16 words
The apparatus according to claim 27, wherein said heating means includes at least one steam-blowing box.
Claim 35
Dependent Claim
15 words
The apparatus according to claim 27, wherein said heating means is arranged above the web.
Claim 36
Dependent Claim
17 words
The apparatus according to claim 27, wherein said at least one dewatering device is a suction site.
Claim 37
Dependent Claim
17 words
The apparatus according to claim 27, wherein said heating means is positioned within said second dewatering zone.
Claim 38
Dependent Claim
15 words
The apparatus according to claim 34, wherein said suction site is provided underneath the web.
Claim 39
Dependent Claim
15 words
The apparatus according to claim 27, wherein said dewatering device includes a further heating means.
Claim 40
Dependent Claim
15 words
The apparatus according to claim 37, wherein said further heating means is a steam-blowing box.
Claim 41
Dependent Claim
23 words
The apparatus according to claim 34, wherein said heating means and suction sites are disposed opposite one another and to form a pair.
Claim 42
Dependent Claim
16 words
The apparatus according to claim 27, wherein said heating means is positioned in the open area.
Claim 43
Dependent Claim
19 words
The apparatus according to claim 34, wherein said at least one suction site is disposed in the open area.
Claim 44
Dependent Claim
26 words
The apparatus according to claim 34, wherein said heating means and said suction sites are disposed in the open area and between double screen belt presses.
Claim 45
Dependent Claim
38 words
The apparatus according to claim 27, wherein a gap between said heating means and said dewatering means is provided, said gap being adapted for the passage therethrough of the web and said apparatus further comprising gap adjustment means.
Claim 46
Dependent Claim
14 words
The apparatus according to claim 43, wherein said dewatering device is a heating means.
Claim 47
Dependent Claim
14 words
The apparatus according to claim 43, wherein said dewatering device is a suction site.
Claim 48
Dependent Claim
21 words
The apparatus according to claim 43, wherein said gap adjustment means includes means for adjusting the position of said suction site.
Claim 49
Dependent Claim
21 words
The apparatus according to claim 44, wherein said gap adjusting means includes means for adjusting the position of said heating means.
Claim 50
Dependent Claim
15 words
The apparatus according to claim 46, wherein said suction site is pivotal about an axis.
Claim 51
Dependent Claim
15 words
The apparatus according to claim 47, wherein said heating means is pivotal about an axis.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |