EP1280959A2 - Doppelsiebformer - Google Patents
DoppelsiebformerInfo
- Publication number
- EP1280959A2 EP1280959A2 EP01949297A EP01949297A EP1280959A2 EP 1280959 A2 EP1280959 A2 EP 1280959A2 EP 01949297 A EP01949297 A EP 01949297A EP 01949297 A EP01949297 A EP 01949297A EP 1280959 A2 EP1280959 A2 EP 1280959A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- twin
- wire former
- deflection device
- wire
- former
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Definitions
- the invention relates to a twin-wire former for producing a fibrous web, in particular a paper, cardboard or tissue web, from a fibrous suspension according to the preamble of claim 1.
- twin wire former is known from the applicant's German published application DE 198 03 591 A1 (PB10656 DE).
- the twin wire former has two wire belts (bottom wire and top wire) which together form a twin wire zone.
- the two sieve belts In a first part of the twin-wire zone, in which the two sieve belts run over a dewatering element in the form of a rotating forming roller, the two sieve belts form a wedge-shaped inlet gap directly on the forming roller, which directly absorbs the fiber suspension from a headbox (“gap former”)
- the two wire belts with the fibrous web that forms between them run steeply downward over further drainage elements, for example over several forming strips and / or at least one forming shoe, preferably at an angle of 10 ° to 50 ° to an imaginary vertical plane
- the sieve belts run over a deflection device and then over a separating device which separates one of the sieve belts from the fibrous web
- a disadvantage of this known twin wire former is that it has a large overall height due to the relatively large forming roller diameter, which can, for example, take a value between 1.5 and 2.5 m. This large overall height leads to problems with the height of the hall or crane, in particular with conversions, and thus to increased conversion costs and maintenance or operating costs.
- first twin-wire former of the type mentioned at the outset in that the two wire belts run upwards at an angle to an imaginary second horizontal plane after the first deflection device in such a way that the upper vertex of the second deflection device is above the lower vertex of the first deflection device lies, and that the angle between the headbox and the imaginary first horizontal plane runs downwards.
- the upper vertex of the second deflection device is at least 50 mm, preferably at least 100 mm, in particular at least 200 mm, above the lower vertex of the first deflection device and that the angle between the headbox and the second one is intended Horizontal plane takes a value between 0 ° and 45 °, preferably between 0 ° and 30 °.
- a second twin-wire former of the type mentioned at the outset in that the two wire belts run upwards at an angle to an imaginary second horizontal plane after the first deflection device, that a felt forms the fibrous web that forms at a pickup point, which lies above the lower vertex of the first deflection device, decreases from the screen belt and that the pickup point is followed by a press unit in which the fibrous web that is formed is first passed through a first press nip, which is preferably double felted, with a first press roll and a second press roll the first press nip is guided around the first press roll with one of the felts, then transferred to a non-felted press roll in a second press nip, and then passes through at least one further press nip felted on one side, follows.
- a first press nip which is preferably double felted
- the advantages mentioned in the first embodiment also result in this second twin-wire former according to the invention.
- the position of the pick-up point ensures that it does not contribute to an increase in the overall height, in particular when converting, but is in the height range of the upstream twin-wire former determining the overall height.
- the pickup point be at least 50 mm, preferably at least 100 mm, in particular at least 200 mm, above the lower apex of the first deflection device.
- the angle at which the two sieve belts run upwards to an imaginary second horizontal plane after the deflection device assumes a value between 10 ° and 90 °, preferably between 25 ° and 40 °, the achievement of the goal of reducing the overall height being positively supported.
- so-called constant-pressure dewatering elements are arranged between the first deflection device and the separating device, between which the fibrous web that forms, wrapped between the two sieve belts, passes.
- This ensures that the formation of the best possible formation, that is to say chamfering / distribution as uniform as possible, is ensured for the fibrous web that is formed, and this with the highest possible dewatering performance and with the lowest possible energy requirement during the web formation process.
- at least one stationary constant pressure dewatering element is arranged on one sieve belt and at least one constant pressure dewatering element is arranged on the other sieve belt, which can be flexibly adjusted to the sieve belt by means of a selectable force.
- the constant pressure dewatering elements can thus be adapted to different operating conditions and to different fiber suspensions in a lighter, time-saving and cost-effective manner.
- the constant pressure drainage elements are designed as plates or as plate segments, since these forms can be produced and operated inexpensively.
- at least one flat suction device is arranged after the separating device, which acts on the screen belt which carries the fibrous web that is being formed. This additionally positively supports the dewatering and formation of the fibrous web that is formed.
- the screen belt is deflected on the second deflection device in such a way that the screen belt is then at an angle of less than 60 °, preferably less than 40 °, in particular less than 25 °, down to an imaginary second vertical plane running.
- the screen belt is deflected in such a way that the screen belt then runs essentially horizontally, with a further sheet formation device, preferably a hybrid former, being arranged downstream of the second deflection device.
- the sieve belt advantageously runs at least 50 mm, preferably at least 100 mm, above the lower vertex of the first deflection device.
- the second deflection device is preferably a suction roll, a shoe with lasts or a shoe with lasts and with vacuum application, since these elements are part of the known state of the art and therefore have increased functional reliability and low acquisition costs, possibly also low operating costs.
- the distance between the lower vertex of the first deflection device and the upper vertex of the second deflection device has a value between 1 and 8 m, preferably between 3 and 6 m.
- the first deflection device is a closed roller, an open roller or an open roller with vacuum application.
- the separating device is designed as a separating suction device and / or as a vacuum shoe.
- the forming roller which according to the invention advantageously has a diameter of greater than 1,200 mm, preferably greater than 1,635 mm, in particular greater than 1,760 mm, is designed as an open roller, the open forming roller by means of one Grill or honeycomb structure is open or is a suction roller.
- the forming roller has a dewatering capacity that has a value of at least 50%, preferably at least 65%, of the total dewatering capacity of the twin wire former. This means that the components for the remaining drainage, including the overall height, can be significantly smaller than usual. It is technologically advantageous if the dewatering on the deflection roller is greater than on the other rollers, that is to say the roller diameter of the deflection roller is larger than the roller diameter of the forming roller and / or the roller diameter of the suction roller.
- twin-wire former has an overall height in a range from 2 to 8 m, preferably from 3 to 6 m.
- twin-wire former according to the invention is also excellently suitable for use in a mold remodeling, since existing structural conditions, for example hall dimensions, generally have to be taken into account here, and the mold remodeling should therefore not require any further space, for example due to an increased overall height of the lulating twin wire former.
- FIG 1 is a schematic and sectional side view of a first advantageous embodiment of the twin wire former according to the invention
- Figure 2 is a schematic and sectional side view of a second advantageous embodiment of the twin wire former according to the invention
- FIGS. 3 to 6 schematic and sectional side views of further advantageous embodiments of the twin wire former according to the invention.
- the twin wire former 1 shown in a schematic and sectional side view in FIG. 1 comprises two endless wire belts, namely a lower wire 2 and an upper wire 3, which guide a fibrous web 4 that forms in the middle.
- These two sieve belts 2, 3 together form a twin-wire zone 5, wherein in the twin-wire zone 5 they run in a first section over a dewatering element 6 in the form of a rotating forming roller 7 and together form a wedge-shaped inlet gap 8 directly from one at an angle ⁇ to an imaginary one
- the first horizontal plane H1 attached headbox 9 receives the fiber suspension ("gap former").
- the schematically illustrated headbox 9 can of course also be equipped as a multi-layer headbox and / or as a headbox with sectionally controllable dilution water technology ("ModuIeJet" system).
- ModeIeJet sectionally controllable dilution water technology
- the two wire belts 2, 3 with the fibrous web 4 that forms between them run over a plurality of drainage elements 6, not shown, such as a forming shoe, a plurality of forming strips or a plurality of constant pressure drainage elements, at an angle of 10 ° to 60 ° down to an imaginary first vertical plane V1.
- the two wire belts 2, 3 run over a first deflection device 10 with a lower apex 10.SU and then over a machine-wide separating device 11, in the area of which the top wire 3 is separated from the fibrous web 4 that is being formed and the bottom wire 2 is led away.
- the lower wire 2 can also be separated from the fibrous web 4 and the upper wire 3 that are being formed.
- the separated top wire continues to a guide roller 12 and from there directly or indirectly via additional rollers back to the wedge-shaped inlet nip 8.
- a second deflection device 15 is arranged with an upper apex 15.
- the first advantageous embodiment of the twin wire former 1 now provides that the two wire belts 2, 3 after the first deflection device 10 are at an angle ß run up to an imaginary second horizontal plane H2 such that the upper vertex 15.
- the upper vertex 15 SO of the second deflection device 15 is at least 50 mm, preferably at least 100 mm, in particular at least 200 mm, above the lower vertex 10 SU of the first deflection device 10 and the angle ⁇ takes a value between 0 ° and 45 according to the invention °, preferably between 0 ° and 30 °.
- angle ⁇ at which the two sieve belts 2, 3 after the first deflection device 10 increases to an imaginary second horizontal plane H2 run a value between 10 ° and 90 °, preferably between 25 ° and 40 °.
- the screen belt 2 is deflected such that the screen belt 2 then runs downward at an angle ⁇ of less than 60 °, preferably less than 40 °, in particular less than 25 °, to an imaginary second vertical plane V2.
- the forming roller 7 in FIG. 1 has a diameter D7 of greater than 1,200 mm, preferably greater than 1,635 mm, in particular greater than 1,760 mm, and is designed as a suction roller; however, it can also be designed as an open roller, the open roller in turn being opened up by means of a grill or honeycomb structure.
- the forming roller 7 has a dewatering capacity which has a value of at least 50%, preferably at least 65%, of the total dewatering capacity of the twin-wire former.
- the first deflection device 10 is a closed roller 16; however, it can also be an open roller or an open roller with vacuum application.
- the separating device 11 in FIG. 1 is designed as a separating suction device 17; however, it can also be designed as a vacuum shoe.
- the second deflection device 14 is designed as a suction roll 13; however, it can also be designed as a shoe with lasts or a shoe with lasts and with vacuum.
- the distance A between the lower vertex 10. SU of the first deflection device 10 and the upper vertex 15. SO of the second deflection device 15 assumes a value between 1 and 8 m, preferably between 3 and 6 m.
- the twin wire former 1 preferably assumes an overall height H in a range from 2 to 8 m, preferably from 3 to 6 m.
- the twin wire former 1 shown in a schematic and sectional side view in FIG. 2 is basically similar to the twin wire former of FIG. 1; with regard to the further description of the twin wire former 1, reference is made to the description of FIG. 1.
- the two wire belts 2, 3 run upward after the first deflection device 10 at an angle ⁇ to an imaginary second horizontal plane H2, that a felt 23 contacts the fiber web 4 that is being formed a pick-up point S P , which lies above the lower vertex 10.SU of the first deflection device 10, decreases from the wire belt 2, and that the pick-up point S P is a press unit 24, in which the fibrous web 4 which forms is preferably first removed by a first double-felted press nip 25 is guided with a first press roller 26 and a second press roller 27, after the first press nip 25 is guided around the first press roller 26 with one of the felts 23, then transferred to a non-felted press roller 29 in a second press nip 28 is, and then at least one further press nip 30 felted on one side, which from the nich t felted press roller 29 and a suction roller 31 is formed, passes, follows.
- the pickup point S P lies at least 50 mm, preferably at least 100 mm, in particular at least 200 mm, above the lower vertex 10 SU of the first deflection device 10.
- the press unit 24 shown in FIG. 2 is taken from the detail of the German published application DE 196 54 325 A1 (PC10453 DE). Furthermore, the German patent application DE 197 44 341 A1 (PC10623 DE) discloses further embodiments of a corresponding press unit. The descriptions of these two mentioned publications are hereby made the subject of the present description in their entirety.
- the press unit 24 can have at least one further one, not shown, but which is part of the known prior art Connect the press unit, whereby the combination of individual press units is also possible. The design of the press unit 24 is therefore not limited to the illustrated and described design of the same.
- the angle ⁇ runs counterclockwise in FIG. 2 with respect to the imaginary first horizontal plane H1.
- FIG. 3 shows a further advantageous embodiment of the twin wire former 1 according to the invention in a schematic and sectional side view.
- This twin wire former 1 has essentially the same construction with regard to the twin wire zone 5 as the twin wire former of FIG. 1.
- constant-pressure dewatering elements 18, 19 are arranged between the first deflection device 10 and the separating device 11 of this twin-wire former 1, between which the fibrous web 4 that forms, wrapped between the two sieve belts 2, 3, runs through.
- Such constant pressure drainage elements 18 are described in the German patent application DE 197 33 316 A1 (PB10569 DE) of the applicant; the content of this publication is hereby made the subject of this description.
- a stationary constant pressure dewatering element 18 is arranged on the upper sieve 3 and at least one constant pressure dewatering element 19 is arranged on the lower sieve 2, which can be flexibly adjusted to the lower sieve 2 by means of a selectable force.
- constant pressure drainage elements 18, 19 can also act in reverse attachment to the sieve belts 2, 3.
- the constant pressure drainage elements 18, 19 are designed as plates or as plate segments.
- three flat suction devices 20 are arranged after the separating device 11, which act on the lower wire 2, which carries the fibrous web 4 that is being formed.
- FIG. A further advantageous embodiment of the twin wire former 1 according to the invention is shown in FIG. provides.
- This twin wire former 1 has essentially the same construction with regard to the twin wire zone 5 as the twin wire former of FIG. 1.
- the second deflection device 15 is designed as a shoe 21. The deflection takes place in such a way that the lower sieve 2 then runs essentially horizontally.
- the second deflection device 15 is followed by a further sheet-forming device 22, which produces a further fibrous web 4.1.
- the two fibrous webs 4, 4.1 are gassed by means of known devices and transported to further production stages of the paper, cardboard or tissue machine. Since the further sheet-forming device is designed as a former, preferably a hybrid former, which is part of the known prior art, it is not dealt with in any more detail; rather, reference is made to the known prior art.
- FIG. 5 shows a schematic and sectional side view of a further advantageous embodiment of the twin wire former 1 according to the invention.
- the angle ⁇ assumes a value of 90 ° according to the invention, so that the twin-wire zone 5 extends vertically upwards after the first deflection device 10. This has the advantage of improved water removal without rewetting and without using a vacuum.
- the lower sieve 2 together with the fibrous web 4 that forms are guided into a horizontal position by means of a suction roller 13.
- the lower wire 2 together with the forming fibrous web 4 runs over three flat suction devices 20, which act on the lower wire 2, which carries the forming fibrous web 4.
- the twin wire former 1 shown in a schematic and sectional side view in FIG. 6 is designed as a hybrid former known per se, the upper wire 3 of the hybrid former simultaneously forming the fourdrinier wire of a fourdrinier wire former with the hybrid former attached.
- S moderate web guidance and the attachment of drainage elements 6, in particular of constant pressure drainage elements will refer to the above statements.
- the invention creates a twin-wire former of the type mentioned, the overall height of which is reduced in such a way that there are no significant additional costs for conversions (conversion costs, maintenance costs, operating costs), and which enables complete post-drainage at higher machine speeds.
- V2 Second vertical plane ⁇ , ⁇ , ⁇ , ⁇ angle
Landscapes
- Paper (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10021320A DE10021320A1 (de) | 2000-05-02 | 2000-05-02 | Doppelsiebformer |
DE10021320 | 2000-05-02 | ||
PCT/EP2001/004774 WO2001083882A2 (de) | 2000-05-02 | 2001-04-27 | Doppelsiebformer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1280959A2 true EP1280959A2 (de) | 2003-02-05 |
EP1280959B1 EP1280959B1 (de) | 2007-04-04 |
Family
ID=7640513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01949297A Expired - Lifetime EP1280959B1 (de) | 2000-05-02 | 2001-04-27 | Doppelsiebformer |
Country Status (7)
Country | Link |
---|---|
US (2) | US6875309B2 (de) |
EP (1) | EP1280959B1 (de) |
JP (1) | JP4992053B2 (de) |
AT (1) | ATE358748T1 (de) |
DE (2) | DE10021320A1 (de) |
ES (1) | ES2282269T3 (de) |
WO (1) | WO2001083882A2 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10255471A1 (de) * | 2002-11-28 | 2004-07-22 | Voith Paper Patent Gmbh | Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren |
EP3091462B1 (de) | 2005-12-14 | 2020-06-17 | Cold Spring Harbor Laboratory | Verfahren zur beurteilung von probabilistischen massnahmen von klinischen ergebnissen mithilfe genomischer profilierung |
US7588663B2 (en) * | 2006-10-20 | 2009-09-15 | Kimberly-Clark Worldwide, Inc. | Multiple mode headbox |
DE102008000778A1 (de) | 2008-03-20 | 2009-09-24 | Voith Patent Gmbh | Stoffauflauf für eine Papier- oder Kartonmaschine |
CA2715826A1 (en) * | 2008-03-21 | 2009-09-24 | Nippon Paper Industries Co., Ltd. | Processes for preparing coated papers |
US8604332B2 (en) | 2010-03-04 | 2013-12-10 | Guardian Industries Corp. | Electronic devices including transparent conductive coatings including carbon nanotubes and nanowire composites, and methods of making the same |
US8460747B2 (en) | 2010-03-04 | 2013-06-11 | Guardian Industries Corp. | Large-area transparent conductive coatings including alloyed carbon nanotubes and nanowire composites, and methods of making the same |
US8518472B2 (en) * | 2010-03-04 | 2013-08-27 | Guardian Industries Corp. | Large-area transparent conductive coatings including doped carbon nanotubes and nanowire composites, and methods of making the same |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1980591U (de) | 1965-10-16 | 1968-03-07 | Krups Fa Robert | Scherkopf fuer elektrische trockenrasierapparate. |
AU2874271A (en) * | 1970-05-25 | 1972-11-16 | The Black Clawson Company | Papermaking machine |
US3726758A (en) * | 1971-07-08 | 1973-04-10 | J Parker | Twin-wire web forming system with dewatering by centrifugal forces |
US3844881A (en) * | 1972-06-09 | 1974-10-29 | Rice Barton Corp | Multi-layered fibrous web forming system employing a suction roll positioned adjacent the web side of the forming wire and around which the forming wire is wrapped |
US3951736A (en) * | 1974-12-30 | 1976-04-20 | Tadashi Kobayashi | Single-layer and multi-layer paper making apparatus |
SE410482B (sv) * | 1978-02-15 | 1979-10-15 | Karlstad Mekaniska Ab | Forfarande och anordning vid en dubbelviraformare |
FI78133C (fi) * | 1980-03-14 | 1989-06-12 | Valmet Oy | Foerfarande vid viradelen foer en pappersmaskin samt dubbelviraformare. |
AT379622B (de) * | 1980-11-26 | 1986-02-10 | Escher Wyss Gmbh | Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben |
AT375111B (de) * | 1981-04-08 | 1984-07-10 | Escher Wyss Gmbh | Doppelsieb-papiermaschine |
DE3222428C2 (de) * | 1982-06-15 | 1985-04-04 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | Doppelsieb-Papiermaschine |
FI84734C (fi) * | 1988-05-23 | 1992-01-10 | Valmet Paper Machinery Inc | Dubbelviraformare foer pappersmaskin. |
DE19654325A1 (de) | 1996-12-24 | 1998-06-25 | Voith Sulzer Papiermasch Gmbh | Pressenpartie für eine Papiermaschine |
DE19702575A1 (de) * | 1997-01-24 | 1998-07-30 | Voith Sulzer Papiermasch Gmbh | Maschine zur Herstellung einer Faserstoffbahn |
DE19733316A1 (de) | 1997-08-01 | 1999-02-04 | Voith Sulzer Papiermasch Gmbh | Verfahren und Vorrichtung zum Bilden einer Faserstoffbahn |
DE19744341A1 (de) | 1997-10-07 | 1999-04-15 | Voith Sulzer Papiertech Patent | Papiermaschine |
DE19803591A1 (de) * | 1998-01-30 | 1999-08-05 | Voith Sulzer Papiertech Patent | Doppelsieb-Former |
DE19950805A1 (de) * | 1999-10-21 | 2001-04-26 | Voith Paper Patent Gmbh | Former |
-
2000
- 2000-05-02 DE DE10021320A patent/DE10021320A1/de not_active Withdrawn
-
2001
- 2001-04-27 US US10/019,285 patent/US6875309B2/en not_active Expired - Fee Related
- 2001-04-27 JP JP2001580485A patent/JP4992053B2/ja not_active Expired - Fee Related
- 2001-04-27 EP EP01949297A patent/EP1280959B1/de not_active Expired - Lifetime
- 2001-04-27 ES ES01949297T patent/ES2282269T3/es not_active Expired - Lifetime
- 2001-04-27 WO PCT/EP2001/004774 patent/WO2001083882A2/de active IP Right Grant
- 2001-04-27 DE DE50112289T patent/DE50112289D1/de not_active Expired - Lifetime
- 2001-04-27 AT AT01949297T patent/ATE358748T1/de active
-
2005
- 2005-01-13 US US11/033,725 patent/US7332060B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0183882A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001083882A3 (de) | 2002-03-14 |
EP1280959B1 (de) | 2007-04-04 |
JP4992053B2 (ja) | 2012-08-08 |
US20040069430A1 (en) | 2004-04-15 |
ES2282269T3 (es) | 2007-10-16 |
WO2001083882A2 (de) | 2001-11-08 |
US20050150623A1 (en) | 2005-07-14 |
ATE358748T1 (de) | 2007-04-15 |
US6875309B2 (en) | 2005-04-05 |
DE10021320A1 (de) | 2001-11-08 |
DE50112289D1 (de) | 2007-05-16 |
JP2003531971A (ja) | 2003-10-28 |
US7332060B2 (en) | 2008-02-19 |
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