WO1999040254A1 - Procede et dispositif pour former des panneaux de fibres - Google Patents

Procede et dispositif pour former des panneaux de fibres Download PDF

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Publication number
WO1999040254A1
WO1999040254A1 PCT/EP1999/000381 EP9900381W WO9940254A1 WO 1999040254 A1 WO1999040254 A1 WO 1999040254A1 EP 9900381 W EP9900381 W EP 9900381W WO 9940254 A1 WO9940254 A1 WO 9940254A1
Authority
WO
WIPO (PCT)
Prior art keywords
wedge
zone
wedge zone
dewatering
headbox
Prior art date
Application number
PCT/EP1999/000381
Other languages
German (de)
English (en)
Inventor
Franz Petschauer
Josef Steinegger
Thomas Kefer
Johannes Kappel
Original Assignee
Andritz-Patentverwaltungs-Gesellschaft Mbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Andritz-Patentverwaltungs-Gesellschaft Mbh filed Critical Andritz-Patentverwaltungs-Gesellschaft Mbh
Priority to DE19980188T priority Critical patent/DE19980188B9/de
Priority to CA002285440A priority patent/CA2285440A1/fr
Priority to AU28291/99A priority patent/AU2829199A/en
Publication of WO1999040254A1 publication Critical patent/WO1999040254A1/fr
Priority to FI991903A priority patent/FI112517B/fi
Priority to SE9903570A priority patent/SE516702C2/sv

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
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers

Definitions

  • the invention relates to a method and an apparatus for forming fiberboard.
  • the classic process for the production of fiberboard is the so-called "wet process”. It is an ecologically preferred production method, since the fiberboard is manufactured practically without chemical binders.
  • a dry process for the production of particle board and MDF ( medium density fibreboard) - process which is also a drying process.
  • the current technology of the wet process is several decades old. In many process stages it is ineffective and has practically no control possibilities.
  • the fibers are crushed in a refiner working under pressure (or only small amounts of) binders have to be used, the fibers have to be sufficiently bonded during the shredding process.
  • the previous principle of forming webs with Fourdrinier screens is also called Foudrinier and has some disadvantages.
  • the current headbox technology fulfills the requirements for formation and calibration of the plate thickness are not. Furthermore, web formation based on the Foudrinier principle requires the use of vacuum as the driving force for the main part of the water to be removed. This means an energy consumption of approx. 150 kW for a typical system. The one-sided drainage results in a large machine length.
  • the invention is therefore characterized in that the fiber suspension is dewatered on both sides between two screens or felts. This can significantly reduce energy consumption since no vacuum is required.
  • a further development of the invention is characterized in that local dilution water is added transversely to the web running direction to regulate the plate thickness. This enables the plate thickness to be evened out in a simple manner without great design effort. The regulation is carried out by measuring the final thickness of the plate.
  • a favorable embodiment of the invention is characterized in that lips of the headbox are set locally to regulate the plate thickness transversely to the web running direction. By means of these lips, a rough adjustment of the plate thickness can be achieved, whereby in combination with the thinning the plate thickness can be achieved even more precisely.
  • a favorable further development of the invention is characterized in that preliminary dewatering takes place in a wedge zone. Due to the increasing pressure in the wedge zone, a high and uniform drainage can be achieved quickly and without using a vacuum, whereby the plate thickness can be influenced accordingly by an adjustable wedge zone.
  • An advantageous development of the invention is characterized in that the material is distributed over the working width by means of a cross flow distributor and a partial flow of the fiber suspension is returned. By returning the suspension at the headbox, the basis weight cross-section can be optimally adjusted.
  • An advantageous embodiment of the invention is characterized in that that a drainage to a dry content of more than 40%, preferably more than 45% takes place. This reduces the pressing time in the subsequent hot press (results in higher throughput), the amount of filtrate more heavily loaded during hot pressing and the steam requirement for evaporating the residual water.
  • a favorable embodiment of the invention is characterized in that a cover layer is applied after the preliminary dewatering, it being possible for vacuum suction to be provided in the area of the application of the cover layer. This makes it possible to achieve good surface properties of the panels by using small amounts of high-quality fibers without having to change the composition or quality of the rest of the panels.
  • a favorable further development of the invention is characterized in that takes place after the top layer task further dewatering in "a wedge zone. As a result, the entire web be well drained including top layer.
  • An advantageous development of the invention is characterized in that several points with line pressure, for example two to six, preferably three to five, are provided. This enables a particularly high final dry matter content to be achieved.
  • the invention also relates to a device for forming fiberboard.
  • an upper sieve is provided in the area of the main drainage. Dewatering on both sides can take place through the top sieve, which practically halves the drainage paths and thus also significantly shortens the length of the machine.
  • An advantageous development of the invention is characterized in that the upper sieve forms a wedge zone together with the lower sieve. As a result, a high and controlled pressing force can be applied to the fibrous web, as a result of which a vacuum is no longer required for dewatering.
  • a favorable embodiment of the invention is characterized in that the wedge zone is adjustable. Thanks to the adjustable wedge zone, the panel thickness can be adjusted particularly well.
  • An advantageous embodiment of the invention is characterized in that the lower sieve is guided essentially horizontally, since an adverse influence of gravity can then be prevented.
  • a favorable further development of the invention is characterized in that the screen or felt in the wedge zone is supported by perforated plastic or steel plates, by foil strips or by register rollers.
  • the advantages of the variants mentioned can only be used by the use of a top sieve according to the invention.
  • a favorable embodiment of the invention is characterized in that a second headbox is provided for applying the cover layer.
  • An advantageous embodiment of the invention is characterized in that the wedge zones are designed so that they can be pressed on at the end, which means that regardless of the plate thickness to be produced, the highest dryness can be achieved after the pre-dewatering and so the fabric is optimally prepared for the downstream press zone.
  • An advantageous development of the invention is characterized in that that several press nips, in particular two to six, preferably three to five, are provided, it being possible for the press rolls to be arranged approximately vertically one above the other. This enables a particularly high final dry content to be achieved.
  • a favorable further development of the invention is characterized in that the press roll of the press nips can be pressed on individually. This allows the final dryness or the drainage curve to be regulated well.
  • a favorable embodiment of the invention is characterized in that the machine frame is made cantileverable. This enables the use of endless screens that have a longer service life at high pressures.
  • FIG. 1 shows a side view of a system according to the prior art
  • FIG. 2 shows a top view of FIG. 1
  • FIG. 3 shows a side view of a system according to the invention
  • FIG. 4 shows a section along line IV-IV in FIG. 3
  • FIG 5 shows a section along line VV in FIG. 3
  • FIG. 6 shows a section through a headbox.
  • FIG. 1 shows a side view of a Foudrinier system 1 with a gravity drainage zone 2, in which the web is guided over rollers 3. This is followed by a zone with vacuum rollers 4, in which a large part of the water is sucked out of the web. This is followed by a further pressing using rollers 5 and 6 arranged in pairs.
  • a typical Foudrinier system according to the prior art has a length of approximately 14 m for a throughput of 180 tpd.
  • FIG. 2 shows the top view on which the large number of necessary rollers 3 and the vacuum rollers 4 and the press rollers 5 and 6 is recognizable. Furthermore, the drive motor 7 with the gear 8 can be seen.
  • a fiberboard system according to the invention is shown. It consists of a headbox 22, a first drainage zone 9, in which the main drainage takes place.
  • This dewatering zone 9 has a lower sieve 10 which is guided through the entire system. It also has an upper sieve 11 so that drainage can take place in both directions. If no secondary material feed is provided, there is only one top screen, which is also led through the entire system. As a result, dewatering takes place evenly through the entire thickness of the web, which is particularly important in the production of fiberboard.
  • the first drainage zone 9 is followed by a further drainage zone 12, in which 13 more water is sucked out of the web via vacuum boxes.
  • an upper sieve 14 is again applied for further dewatering.
  • This screen 14 is also passed through the subsequent press zone 15 with the rollers 16 arranged in pairs.
  • the resulting mechanical dewatering achieves a final dry content of over 40%, preferably over 45%.
  • the headbox 22 can be a cross-flow distributor, with a diffuser block and a perforated roller to destroy the flakes formed in the suspension.
  • the lower sieve 10 runs essentially horizontally through the entire system.
  • a wedge 17 is formed in the first dewatering zone 9 together with the upper sieve 11.
  • the screens 10, 11 run here over perforated plates
  • the wedge zone 17 can at its end
  • the end of Wedge zone forms a roller 20 which drives against the top wire 11.
  • a further headbox 23 can be provided for a cover layer in the area of the dewatering zone 12.
  • Another top sieve 14 is arranged to drain the top layer. Drainage is supported by vacuum extraction (via boxes 13).
  • the upper sieve 14 forms with the lower sieve 10 a further wedge zone 21, which can also be made adjustable and, if necessary, can be pressed on at its end.
  • two to six, preferably three to five press nips, ie pairs of rollers pressed against one another, are provided in the pressing zone 15.
  • the present example has four such roller pairs 16, which form press nips.
  • Fig. 4 shows a section along line IV-IV in Fig. 3. Seen in this section against the web running direction, one can see the lower wedge plate 18, a vacuum box 13 and the roller 20 at the end of the wedge zone 17. With FS the so-called driver's side and with TS the drive side on which all drives and other lines are arranged.
  • FIG. 5 shows a section at the same point as FIG. 4, but seen in the direction of web travel.
  • the drive side and driver side are therefore interchanged here with respect to FIG. 4.
  • the further headbox 23 for the cover layer can be seen.
  • the suspension is fed into the headbox 23 via a connecting line 24 from the drive side.
  • the extracted water is over a Line 25 discharged from the vacuum box 13.
  • the suspension is supplied via a cross-flow distributor 26 and, via a diffuser block 27, reaches a perforated roller 28 which destroys the flakes which form in the suspension. From there it is introduced into the wedge zone 17 formed by the lower sieve 10 and the upper sieve 11.
  • the invention is not restricted to the examples shown. Depending on the requirements, other combinations of the individual drainage zones can also be provided.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé permettant de former des panneaux de fibres. L'invention se caractérise principalement en ce que la suspension de fibres est déshydratée de part et d'autre entre deux cribles ou feutres (10, 11). L'invention concerne par ailleurs un dispositif permettant de mettre ledit procédé en oeuvre, dans le cadre duquel il est prévu un crible supérieur (11) dans la zone où s'effectue la déshydratation principale (9).
PCT/EP1999/000381 1998-02-06 1999-01-21 Procede et dispositif pour former des panneaux de fibres WO1999040254A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE19980188T DE19980188B9 (de) 1998-02-06 1999-01-21 Verfahren und Vorrichtung zur Formierung von Faserplatten
CA002285440A CA2285440A1 (fr) 1998-02-06 1999-01-21 Procede et dispositif pour former des panneaux de fibres
AU28291/99A AU2829199A (en) 1998-02-06 1999-01-21 Method and device for the production of fibre panels
FI991903A FI112517B (fi) 1998-02-06 1999-09-07 Menetelmä ja laite kuitulevyn muodostamiseksi
SE9903570A SE516702C2 (sv) 1998-02-06 1999-10-04 Förfarande och anordning för formning av fiberskivor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA215/98 1998-02-06
AT0021598A AT405951B (de) 1998-02-06 1998-02-06 Verfahren und vorrichtung zur formierung von faserplatten

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US40233399A A-371-Of-International 1998-02-06 1999-12-20
US10/053,435 Continuation-In-Part US20020084051A1 (en) 1998-02-06 2002-01-17 Process and a device for the formation of fiberboard
US10/942,435 Continuation-In-Part US20050045299A1 (en) 1998-02-06 2004-09-16 Process and a device for the formation of fiberboard

Publications (1)

Publication Number Publication Date
WO1999040254A1 true WO1999040254A1 (fr) 1999-08-12

Family

ID=3484580

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/000381 WO1999040254A1 (fr) 1998-02-06 1999-01-21 Procede et dispositif pour former des panneaux de fibres

Country Status (8)

Country Link
AT (1) AT405951B (fr)
AU (1) AU2829199A (fr)
CA (1) CA2285440A1 (fr)
DE (1) DE19980188B9 (fr)
FI (1) FI112517B (fr)
SE (1) SE516702C2 (fr)
WO (1) WO1999040254A1 (fr)
ZA (1) ZA99916B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2830046A1 (de) * 1977-09-21 1979-03-29 Tampella Oy Ab Verfahren und einrichtung zur regelung des querprofils der faserbahn in einer papiermaschine
GB2013747A (en) * 1978-01-31 1979-08-15 Fuji Mfg Co Ltd Making fibreboard
DE3235766A1 (de) * 1982-09-22 1984-03-22 Escher Wyss Gmbh, 7980 Ravensburg Papiermaschine
EP0488058A1 (fr) * 1990-11-29 1992-06-03 Valmet Paper Machinery Inc. Aire de formation dans la section de formage à deux toiles d'une machine à papier

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE733057C (de) * 1939-02-18 1943-03-18 Ing Matthias Weiss Entwaesserungs- oder Abpressmaschine fuer fortlaufend bewegte, nasse Stoffbahnen
DE866462C (de) * 1948-10-02 1953-02-09 Rudolph Koepp & Co Chem Fab A Verfahren und Vorrichtung zum kontinuierlichen Pressen, Trocknen und Formen von Material der verschiedensten Art
DE3932098C1 (fr) * 1989-09-26 1990-09-06 G. Siempelkamp Gmbh & Co, 4150 Krefeld, De
DE19523395A1 (de) * 1995-06-28 1997-01-02 Schaeffler Waelzlager Kg Schraubgetriebe mit einer Wälzringmutter
FI98843C (fi) * 1995-10-03 1997-08-25 Valmet Corp Menetelmä ja laite veden poistamiseksi paperi- tai kartonkiradasta puristamalla
JP3670373B2 (ja) * 1995-12-27 2005-07-13 株式会社たいへい 軽量繊維板の製造装置
AT405538B (de) * 1997-11-28 1999-09-27 Andritz Patentverwaltung Vorrichtung zum entwässern einer faserstoffbahn

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2830046A1 (de) * 1977-09-21 1979-03-29 Tampella Oy Ab Verfahren und einrichtung zur regelung des querprofils der faserbahn in einer papiermaschine
GB2013747A (en) * 1978-01-31 1979-08-15 Fuji Mfg Co Ltd Making fibreboard
DE3235766A1 (de) * 1982-09-22 1984-03-22 Escher Wyss Gmbh, 7980 Ravensburg Papiermaschine
EP0488058A1 (fr) * 1990-11-29 1992-06-03 Valmet Paper Machinery Inc. Aire de formation dans la section de formage à deux toiles d'une machine à papier

Also Published As

Publication number Publication date
CA2285440A1 (fr) 1999-08-12
SE516702C2 (sv) 2002-02-12
DE19980188B4 (de) 2006-05-24
SE9903570L (sv) 1999-10-04
FI112517B (fi) 2003-12-15
AU2829199A (en) 1999-08-23
FI19991903A (fi) 1999-09-07
AT405951B (de) 2000-01-25
DE19980188B9 (de) 2006-09-14
ZA99916B (en) 1999-08-05
SE9903570D0 (sv) 1999-10-04
DE19980188D2 (de) 2000-02-10
ATA21598A (de) 1999-05-15

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