EP0967323B1 - Doppelsiebformer - Google Patents
Doppelsiebformer Download PDFInfo
- Publication number
- EP0967323B1 EP0967323B1 EP99101848A EP99101848A EP0967323B1 EP 0967323 B1 EP0967323 B1 EP 0967323B1 EP 99101848 A EP99101848 A EP 99101848A EP 99101848 A EP99101848 A EP 99101848A EP 0967323 B1 EP0967323 B1 EP 0967323B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- twin
- fourdrinier
- mesh belt
- bar
- 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.)
- Expired - Lifetime
Links
Images
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 forming a fibrous web according to the preamble of claim 1.
- a twin wire former has two endless, rotating wire belts which together form a twin wire zone.
- the fibrous web forms between the two wire belts.
- the two wire belts run together over a forming roller, one wire belt, namely the “inner” wire belt, coming into direct contact with the forming roller.
- the other wire belt namely the "outer” wire belt, comes into contact with at least one support device extending transversely over the wire belt, here with a bar. In special cases, this bar can be rigidly fixed in the machine frame.
- the outer sieve belt can preferably be resiliently pressed onto the outer sieve belt (for example by means of a pneumatic hose).
- a temporary divergence of the two sieve belts should be prevented by means of the bar at the drain point mentioned.
- Such a divergence of the two sieve belts can occasionally be observed, although the sieve belts are stretched in the running direction. The result is that proper formation of the fibrous web is disturbed.
- the resilient pressing of the bar provides the advantage that the position of the bar automatically adapts to the current layer thickness of the fiber suspension located between the two sieve belts. In a similar form, this is also disclosed in WO 95/34713.
- the prior art arrangements described above have not yet proven to be sufficiently effective. Occasionally one still observes disturbances of an orderly path formation.
- the invention is therefore based on the object of a twin wire former described design to improve that the disturbances mentioned be avoided in the quality of the finished paper.
- the support device is a bar, the one the sliding surface touching the outer sieve belt and a sliding surface in thereon Screen direction seen-adjoining foil surface, for the purpose of generating Vacuum diverges from the outer screen belt.
- the effect of the inventive design of the negative pressure zone is based on the fact that a similar negative pressure develops in the gusset, which always is present between the running inner screen belt and the jacket of the Forming roll.
- the sliding surface of the foil strip touching the outer screen belt resiliently pressed onto the outer screen belt.
- the foil strip (seen in a cross section through the foil strip) in its downstream Area by means of a joint on a fixed or on an adjustable Support component and in its upstream area by means of a flexible Press the adjusting device (e.g. pneumatic hose) onto the outer sieve belt.
- a breast roller 13 and a forming roller can be seen from a twin wire former 14 and two screen belts 11 and 12, which - starting on the forming roller 14 - form a twin wire zone with each other.
- the one screen belt 12 is the so-called inner screen belt, which is in direct contact comes with the forming roller 14.
- the other sieve belt 11 is the so-called outer one screen belt; it comes into direct contact with the breast roller 13 and runs from it to the forming roller 14.
- a headbox 10 guides a fiber suspension jet into the (from the two sieve belts 11 and 12 formed) inlet gusset. Loop around the two sieve belts 11 and 12 now together a relatively small area of the jacket of the forming roller 14; A suction zone 14a can be located in this area.
- a support device 9 which is shown in Figure 1 as a so-called Foil bar is formed.
- This has an outer screen belt 12 touching Slide surface 9a and a foil surface 9b adjoining it in the direction of wire travel. The the latter diverges at a small angle of, for example, 1 to 5 ° from the outside Sieve belt 12. This results from the movement of the sieve belts between the Foil area 9b and the outer screen belt 11 a negative pressure zone.
- the foil bar 9 is part of a drainage box 8, for example Guide the sieve belts has further strips 8a.
- a bearing block 7a To support the foil bar on the drainage box 8, a bearing block 7a, the downstream Supported area of the foil bar 9 by means of a joint 7.
- the upstream area the foil strip 9 with the sliding surface 9a is by means of a pneumatic hose 6 (with finely adjustable power) resiliently pressed onto the outer sieve belt 11.
- the sliding surface 9a of the foil bar 9 is in the immediate vicinity of the drain point of the two screen belts 11 and 12 from the forming roller 14.
- the outer sieve belt 11 Contacting sliding surface 9a by a small amount x downstream from (ie behind) the Arrange drain point A.
- An arrangement of the sliding surface 9a in front of the drain point A is also possible.
- FIG. 3 shows a schematic Side view of a complete twin wire former, again with a headbox 10, two endless sieve belts 11 and 12, breast roll 13 and forming roll 14, from the two sieve belts to a small sector a (with an angle between 10 and 40 °) is entwined.
- the two fabric belts run from the forming roller 14 (together with the fibrous web that forms in between) via a first Suction roller 18 and then a second suction roller 19.
- the inner part separates Screen belt 12 from the fibrous web and runs back over guide rolls 22 to the forming roll 14.
- the outer screen belt 11 continues the fibrous web until the fibrous web removed from the sieve belt by means of a take-off felt 23 and a take-off roller 24 becomes.
- the outer screen belt 11 runs over guide rollers 21 back to the breast roller 13.
- In the loop of the (lower) outer sieve belt 11 there is one pivotable support device 15 '.
- Foilark 9 arranged, also two compliant to the Umschlingunszone the forming roller 14 pressable formation strips 15.
- the arrangement is made such that the outer sieve belt 11 is a lower sieve and that the inner sieve belt 12th is a top sieve.
- the foil bar 9 is from bottom to top in the direction of the forming roller 14 pressed against the lower sieve 11.
- the two sieve belts run from the forming roller 14, obliquely upwards.
- the outer screen belt 11 comes with a Foil strip 9 in contact, which (as described above) with the outer sieve belt 11 Vacuum zone forms.
- the outer sieve belt 11 is a top sieve and the inner sieve belt 12 a bottom sieve, so that the foil strip 9 from top to bottom to the top sieve 11 is pressed.
- the foil strip 9 is in turn fixed by means of a joint 7 Component supported, which in the present case as an upper drainage box 38 is formed. This is bulged down slightly (with one large radius of curvature R).
- a series of strips 28 which are fixedly connected to the box 38 and over which the outer screen belt 11 slides.
- vacuum chambers 32 are formed in the box.
- Within the loop of the inner screen belt 12 is a lower drainage box 37 provided.
- FIG. 5 shows a more compact design compared to FIG. 4, in which the separating suction device 33 does not apply.
- the drain box 38 ' has an additional vacuum chamber 32 '; the screen suction roller 30 is arranged immediately behind this.
- the twin wire former shown in FIG. 6 again comprises two wire belts 11 and 12.
- the inner sieve belt 12 forms a lower sieve and the outer sieve belt 11 is a top sieve.
- the top wire 11 on the circumference of the forming roller 14 comes into contact with the lower sieve 12, it runs over a breast roller 13.
- the two screen belts 11 and 12 form together a wedge-shaped inlet gap, which is directly from a headbox 10 Fibrous suspension absorbs.
- the headbox is only indicated schematically. It is preferably a Headbox, which in a known manner with a sectionally controllable dilution water addition is equipped for the purpose of setting a desired basis weight cross section the finished paper web.
- the twin-wire former has within the loop of the upper wire 11 in the area of Forming roller 14, a water collecting device 36. It first arrives there large part of the suspension water, which at the beginning of the twin sieve zone Upper sieve 11 penetrates. This is done essentially in the upper descending quadrant the forming roll 14. Approximately at the level of the film roll axis of rotation the two sieves 11 and 12 run with the fibrous web formed between them down from the forming roller. They then run over one in the loop of the Upper sieve 12 arranged, and formed from strips 8a convex curved forming shoe. Further suspension water penetrates into the collecting trough between the strips 8a 36. Another part of the suspension water flows through the lower sieve 11 in a drip pan 40.
- molding strips can be provided, which are known in the art Can be resiliently pressed onto the lower sieve 12 (not shown in FIG. 6). Instead of these forming strips, the bottom wire 12 can be in the area of the strips 8a at least one deflector can be assigned.
- the jacket of the forming roller 14 has recesses for temporary use in a known manner Storing water, e.g. in the form of a honeycomb cover and one on it attached sieve stocking.
- the forming roller 14 can be designed as a suction roller, with vacuum source 29. Also arranged in the loop of the top wire 11 Water collecting device 36 can be connected to a vacuum source 29 'if necessary his. According to the invention at the outlet of the sieve belts 11, 12 of the forming roll 14 arranged a vacuum bar 9, with the help of of the features described in FIG. 1.
- the twin-wire zone forms one with an imaginary vertical plane Angle a, which is between 10 and 50 degrees, in this section the top sieve 11 is always located above the lower sieve 12.
- the angle a is preferably less than 45 degrees.
- further drainage elements can be provided, e.g. the lower sieve 12 touching suction boxes 47.
- Deflection roller 42 is provided, which essentially transforms the two screen belts 11, 12 into one horizontal direction deflected.
- Separating suction device 33 is provided, on which the upper sieve 11 is separated from the lower sieve 12 and the paper web on it lifts off.
- the top wire 11 runs from here over guide rollers 46 back to the breast roll 13.
- the bottom wire 12 runs after the separating suction device 33 - If necessary via at least one further suction box 37 '- to a screen suction roll 30, then via guide rollers 41 back to the forming roller 14.
- the paper web formed in a known manner by means of a Felt 23 and a take-off roller 24 removed from the lower wire 11.
- the foil strip 9 according to the invention in connection with steep sieve belts running below can also be used in a twin-wire former according to the German published application DE / A1 19651493; this is for education a multilayer paper web arranged on a long screen.
Description
Indessen haben sich die oben beschriebenen Anordnungen des Standes der Technik noch nicht als genügend wirksam erwiesen. Gelegentlich beobachtet man immer noch Störungen einer geordneten Bahnbildung.
Claims (9)
- Doppelsiebformer zum Bilden einer Faserstoffbahn, z.B. Papierbahn, aus einer Fasersuspension, insbesondere als Teil einer Papierherstellungsmaschine, mit den folgenden Merkmalen:a) Zwei endlose, umlaufende Siebbänder (11, 12) bilden miteinander eine Doppelsiebzone, in der sich die Faserstoffbahn zwischen den zwei Siebbändern (11, 12) bildet;b) In der Doppelsiebzone laufen die zwei Siebbänder (11, 12), gemeinsam über eine Formierwalze (14), wobei das eine Siebband nämlich das "innere" Siebband (12), in direkten Kontakt mit der Formierwalze (14) kommt;c) Im Bereich der Ablaufstelle der beiden Siebbänder (11, 12) von der Formierwalze (14) kommt das andere Siebband, nämlich das "äußere" Siebband (11), in Kontakt mit wenigstens einer sich quer über das Siebband erstreckenden Stützeinrichtung (9), wobei die Stützeinrichtung (9) auf das äußere Siebband (11) Unterdruck ausübt;
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß die Leiste (9) an ihrer Gleitfläche (9a) nachgiebig an das äußere Siebband (11) andrückbar ist.
- Doppelsiebformer nach Anspruch 2, dadurch gekennzeichnet, daß - in einem Querschnitt durch die Leiste (9) gesehen - der stromabwärtige Bereich der Leiste (9) mittels eines Gelenks (7) abgestützt ist, der stromaufwärtige Bereich der Leiste (9) dagegen mittels einer nachgiebigen Stellenrichtung, z.B. mittels eines Pneumatikschlauches (6).
- Doppelsiebformer nach Anspruch 3, dadurch gekennzeichnet, daß der Abstand des Gelenks (7) vom äußeren Siebband (11) variierbar ist, um den Neigungswinkel zwischen der Foilfläche (9b) und dem äußeren Siebband (11) und somit die Höhe des entstehenden Unterdrucks anpassen zu können.
- Doppelsiebformer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Position der Stützeinrichtung (9) im wesentlichen parallel zur Sieblaufrichtung (Pfeil P) variierbar ist.
- Doppelsiebformer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Stützeinrichtung (9) in der Schlaufe eines Untersiebes (11) und die Formierwalze (14) in der Schlaufe eines Obersiebes (12) angeordnet sind.
- Doppelsiebformer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Stützeinrichtung (9) in der Schlaufe eines Obersiebes (12) und die Formierwalze (14) in der Schlaufe eines Untersiebes (11) angeordnet sind.
- Doppelsiebformer nach Anspruch 7, dadurch gekennzeichnet, daß die Siebe (11, 12) zwischen Formierwalze (14) und Stützeinrichtung (9) von unten nach oben laufen.
- Doppelsiebformer nach Anspruch 7, dadurch gekennzeichnet, daß die Siebe (11, 12) zwischen Formierwalze (14) und Stützeinrichtung (9) von oben nach unten laufen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19828237 | 1998-06-25 | ||
DE19828237A DE19828237A1 (de) | 1998-06-25 | 1998-06-25 | Doppelsiebformer |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0967323A2 EP0967323A2 (de) | 1999-12-29 |
EP0967323A3 EP0967323A3 (de) | 2000-01-05 |
EP0967323B1 true EP0967323B1 (de) | 2003-01-02 |
Family
ID=7871926
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99101848A Expired - Lifetime EP0967323B1 (de) | 1998-06-25 | 1999-01-28 | Doppelsiebformer |
Country Status (4)
Country | Link |
---|---|
US (1) | US6254727B1 (de) |
EP (1) | EP0967323B1 (de) |
AT (1) | ATE230454T1 (de) |
DE (2) | DE19828237A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10343914A1 (de) * | 2003-09-19 | 2005-05-04 | Voith Paper Patent Gmbh | Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren |
DE102004000068A1 (de) * | 2004-12-30 | 2006-07-13 | Voith Paper Patent Gmbh | Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn |
FI20065142L (fi) * | 2006-02-28 | 2007-08-29 | Metso Paper Inc | Imulaatikon etäisyyden säätö vastatelasta |
FI120796B (fi) * | 2006-03-31 | 2010-03-15 | Metso Paper Inc | Imulaatikon etäisyyden säätö vastatelasta |
EP3676447B1 (de) * | 2017-09-01 | 2023-10-11 | Stora Enso Oyj | Verfahren zur herstellung einer pappe, pappe und wellpappe |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH601556A5 (de) * | 1975-10-03 | 1978-07-14 | Escher Wyss Gmbh | |
DE3815316C2 (de) * | 1988-05-05 | 1996-02-01 | Voith Sulzer Papiermasch Gmbh | Vorrichtung zur Entwässerung an einem Doppelsieb-Former |
DE4026953C2 (de) * | 1990-01-26 | 1995-11-30 | Escher Wyss Gmbh | Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer |
DE9105328U1 (de) * | 1991-04-30 | 1991-07-04 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
FI920228A0 (fi) | 1992-01-17 | 1992-01-17 | Valmet Paper Machinery Inc | Banformningsparti foer pappersmaskin. |
US5573643A (en) | 1992-01-17 | 1996-11-12 | Valmet Corporation | Twin wire web former in a paper machine |
DE4328024A1 (de) * | 1993-08-20 | 1995-02-23 | Voith Gmbh J M | Doppelsieb-Blattbildner |
FI112509B (fi) * | 1994-06-15 | 2003-12-15 | Metso Paper Inc | Paperikoneen kitaformeri |
DE19652485A1 (de) * | 1996-12-17 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Siebpartie und Verfahren zum Entwässern einer Faserstoffbahn in einer Siebpartie |
-
1998
- 1998-06-25 DE DE19828237A patent/DE19828237A1/de not_active Withdrawn
-
1999
- 1999-01-28 DE DE59903896T patent/DE59903896D1/de not_active Expired - Lifetime
- 1999-01-28 AT AT99101848T patent/ATE230454T1/de not_active IP Right Cessation
- 1999-01-28 EP EP99101848A patent/EP0967323B1/de not_active Expired - Lifetime
- 1999-05-13 US US09/310,745 patent/US6254727B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE19828237A1 (de) | 1999-12-30 |
ATE230454T1 (de) | 2003-01-15 |
DE59903896D1 (de) | 2003-02-06 |
EP0967323A2 (de) | 1999-12-29 |
EP0967323A3 (de) | 2000-01-05 |
US6254727B1 (en) | 2001-07-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0933473B1 (de) | Doppelsieb-Former | |
DE3100713A1 (de) | Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben" | |
WO1992006242A1 (de) | Vorrichtung zum herstellen eines mehrlagigen papiers oder kartons | |
DE4102065A1 (de) | Doppelsiebformer | |
DE3344217A1 (de) | Vorrichtung zum ueberfuehren einer papierbahn von der pressen- in die trockenpartie einer papiermaschine | |
EP0665914B1 (de) | Doppelsieb-blattbildner | |
DE2920713A1 (de) | Verfahren und vorrichtung zur abnahme einer bahn vom bildungssieb und zu ihrer ueberfuehrung an ein tuch der presspartie einer papiermaschine | |
DE2534290B2 (de) | Siebpartie für Papiermaschinen | |
EP0069925B1 (de) | Siebpartie einer Papiermaschine | |
EP0967323B1 (de) | Doppelsiebformer | |
DE1147470B (de) | Vorrichtung zum Herstellen von Bahnen aus Papier, Pappe od. dgl. | |
DE3014321A1 (de) | Papiermaschine mit einem siebzylinder | |
DE4328997A1 (de) | Naßpartie einer Papiermaschine sowie Verfahren zu deren Betreiben | |
AT16049U1 (de) | Siebpartie, insbesondere eine umgebaute siebpartie | |
DE3107730A1 (de) | "doppelsiebpartie" | |
DE10021320A1 (de) | Doppelsiebformer | |
DE4326867C2 (de) | Siebpartie einer Maschine zur Herstellung von Faserstoffbahnen | |
AT382655B (de) | Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben | |
EP1370726A1 (de) | Doppelsiebformer | |
EP3152360A1 (de) | Einrichtung zum herstellen einer faserstoffbahn | |
EP3423627B1 (de) | Rundsiebpapiermaschine | |
DE69923084T2 (de) | Doppelsiebformer | |
DE2908791C3 (de) | Bahnbildungsabschnitt der Siebpartie einer Papiermaschine | |
DE60113876T2 (de) | Saugkasten mit skimmerleiste | |
DE1511189C (de) | Entwässerungsvorrichtung für eine Langsieb-Papiermaschine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT DE FI SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
17P | Request for examination filed |
Effective date: 20000705 |
|
AKX | Designation fees paid |
Free format text: AT DE FI SE |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH PAPER PATENT GMBH |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 20020415 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE FI SE |
|
REF | Corresponds to: |
Ref document number: 230454 Country of ref document: AT Date of ref document: 20030115 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 59903896 Country of ref document: DE Date of ref document: 20030206 Kind code of ref document: P |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20031003 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20091223 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FI Payment date: 20100115 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20100121 Year of fee payment: 12 Ref country code: AT Payment date: 20100114 Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: EUG |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110128 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110128 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 59903896 Country of ref document: DE Effective date: 20110802 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110129 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20110802 |