EP1874513B1 - Procede pour fabriquer des panneaux de fibres a moyenne densite et elements de moulage fibreux a emissions polluantes reduites et faible gonflement - Google Patents

Procede pour fabriquer des panneaux de fibres a moyenne densite et elements de moulage fibreux a emissions polluantes reduites et faible gonflement Download PDF

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Publication number
EP1874513B1
EP1874513B1 EP06742271A EP06742271A EP1874513B1 EP 1874513 B1 EP1874513 B1 EP 1874513B1 EP 06742271 A EP06742271 A EP 06742271A EP 06742271 A EP06742271 A EP 06742271A EP 1874513 B1 EP1874513 B1 EP 1874513B1
Authority
EP
European Patent Office
Prior art keywords
tannin
fibers
added
lignocelluloses
boards
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.)
Not-in-force
Application number
EP06742271A
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German (de)
English (en)
Other versions
EP1874513A1 (fr
Inventor
Edmone Roffael
Thomas Schneider
Brigitte Dix
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Priority to PL06742271T priority Critical patent/PL1874513T3/pl
Publication of EP1874513A1 publication Critical patent/EP1874513A1/fr
Application granted granted Critical
Publication of EP1874513B1 publication Critical patent/EP1874513B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder

Definitions

  • the invention relates to a method for the production of medium-density fiberboard (MDF) according to the preamble of claim 1, with reduced emission of volatile organic compounds (VOC) and at the same time low thickness swelling.
  • Volatile organic compounds subsume organic substances whose boiling point is between 50 ° C and 260 ° C. Most of the volatile organic compounds come from the wood, but sometimes also from the binder. The interaction between binder and wood also influences the composition of the volatile constituents; other influencing factors are the production conditions of the medium-density fiberboard. Wood-based materials also emit formaldehyde. However, formaldehyde is not included in the definition of volatile organic compounds.
  • Lignocelluloses can be woods and annual plants.
  • thermomechanical process also the production of fibers by the chemo-thermo-mechanical process (CTMP process) is from the EP 0 639 434 known.
  • CMP process chemo-thermo-mechanical process
  • wood chipping products such as Wood chips washed first to remove any existing sand particles. After washing, the wood chips are usually pre-steamed at temperatures between 60 ° C and 80 ° C and then get via screw conveyance in the so-called cooker, where they are usually digested thermohydrolytically at temperatures of 170 ° C to 180 ° C.
  • the digested chips are transferred to a pressure refiner, where they are fiberized under pressure at temperatures of 170 ° C to 180 ° C.
  • the defibering in the pressure refiner can be followed by a non-pressurized refining stage.
  • the digestion conditions can be varied depending on the raw material; for annual plants, lower temperatures of 140 ° C to 160 ° C can be used for digestion.
  • the fibers are conveyed by the pressure prevailing in the refiner into a blow pipe, where they are provided with a binder.
  • chemicals such as sodium sulfite and sodium hydroxide, or combinations of sodium sulfite and sodium hydroxide, are added to the wood chippings before or during digestion. The addition of other chemicals is possible.
  • binders for the production of medium-density fiberboard mainly amino resins such as urea-formaldehyde resins (UF resins) are used, other synthetic binders such as alkaline curing phenol-formaldehyde resins (PF resins) and adhesives based on polymeric diisocyanates (PMDI), however, have only a relatively small importance , It is also possible to use thermoplastic binders such as methacrylate reaction resins for bonding fibers.
  • the binder used for the production of MDF is often injected into the blast line, but it can also be applied after drying the fibers in a blender.
  • Combinations of the two methods are also possible, so only a part of the binder can be injected into the blowing line and the rest are applied only after drying in the blender. It can also enter the blowpipe Binder of certain composition introduced and used after drying another binder with different composition.
  • binders based on natural substances such as tannin-formaldehyde resins (TF resins) can be used for the production of MDF.
  • the TF resins are obtained by reaction between tannins and formaldehyde.
  • the tannins in particular the condensed tannins, are obtained by extraction from certain barks and woods. Particularly suitable for this Quebrachoholz (Quebracho colorado) and bark such as acacia bark (Acacia mearnsii), spruce bark (Picea abies), etc.
  • the extraction of tannins from wood and bark is usually carried out at temperatures between 70 ° C and 130 ° C in water in the cascade process according to the countercurrent principle.
  • binders During extraction, chemicals such as sodium sulfite and / or sodium hydroxide may also be added to predominantly increase the solubility of tannin in the water. The sulfitation of tannin can also take place after the extraction.
  • the extracted tannins are reacted with formaldehyde.
  • starch As another natural binder, starch can be used in various forms (native starch, oxidized starch, modified starch). Also combinations of tannin and starch are known as binders.
  • the volatile degradation components of the wood, coming from the refiner, may be partially emitted during the drying of the fiber to the environment since they are steam volatile. Furthermore, the volatile acids can act as a hardener and partially precondens the injected binder in the blowpipe and optionally during drying. This leads to reduced adhesion of the binder during pressing.
  • the non-volatile degraded carbohydrates formed during digestion remain in the fiberboards produced and may reduce their biological resistance.
  • the DE 101 24 638 A1 describes a process for producing tanning-bonded lignocellulosic plates from used chipboard and fibreboard in which shredded products from the used plates are digested with tannin solutions in a concentration between 1% and 30% in the temperature range between 70 ° C and 200 ° C, dried, spread into mats and be pressed hot.
  • the aim of the process is to produce medium-density fiberboard with the binder tannin-formaldehyde resin without previously controlling tannin with formaldehyde to produce tannin-formaldehyde resins.
  • the decomposition of used wood chips and used wood fiber boards releases formaldehyde and reacts with the aqueous diluted tannin solution to form tannin formaldehyde resin.
  • the object of the invention is firstly to reduce the amount of volatile constituents from medium-density fiberboard and their formation ' largely to prevent and on the other hand, the physico-technological properties of the plates produced to improve. In particular, the thickness swelling of the plates should be reduced.
  • This method with a combined application of CTMP and the presence of tannins is suitable for all lignocelluloses.
  • the addition of chemicals in the sense of the CTMP process can be carried out prior to digestion or during the digestion in a known manner.
  • sodium sulfite, sodium bisulfite and sodium hydroxide or optimized mixtures thereof may be used. Since sodium sulfite and sodium bisulfite can sulfite the tannin and increase its solubility in the water, this procedure makes it possible to combine the digestion and defibration of wood chips with the sulfitation of the condensed tannin in the refiner in a meaningful manner.
  • pine wood chips were digested at a temperature of 170 ° C, in the fiberization stage under pressure in the refiner condensed tannins were added to the wood chips before digestion in amounts of 2% (solid based on atro wood material) (Experiment 2).
  • the dried fibers were usually mixed with the UF resin Glueing amounts of 12% (solid resin based on dry fibers), shaped into fiber mats and hot pressed into medium-density fibreboard (see Experiment 1).
  • the plates thus prepared were then at 20 ° C and 65% rel. Humidity stored before they were tested for their physical-technological properties and emission.
  • medium density fiberboards were made from fibers prepared by adding 1% Na 2 SO 3 and 0.5% NaOH (solid based on dry wood material) according to the CTMP method.
  • the digestion temperature was 170 ° C.
  • the production of the MDF was carried out under the same conditions as in the case of the TMP fibers (see Experiment 1).
  • binders for the production of medium-density fibreboards can be those which lead to a moisture-resistant fiber-to-fiber bond as well as those which lead to fiber-to-fiber bonding with low moisture resistance.
  • Typical binders for the production of moisture-resistant adhesives are alkaline curing phenol-formaldehyde resins (PF resins), tannin-formaldehyde resins (TF resins), melamine-urea phenol-formaldehyde resins (MUPF resins) and adhesives based on PMDI (polymeric diphenylmethane diisocyanates). Binders that result in low moisture resistance fiber-to-fiber bonding include urea formaldehyde resins (UF resins).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Reinforced Plastic Materials (AREA)

Claims (11)

  1. Procédé de fabrication de panneaux de fibres, en particulier des panneaux de fibres à moyenne densité, à base de lignocelluloses, dans lequel on dissout de façon chimico-thermo-hydrolytique les lignocelluloses et ensuite on les défibre dans une défibreuse, on les munit d'un liant, on les disperse en mats de fibres et on les presse en panneaux de fibres, caractérisé en ce que le défibrement des lignocelluloses s'effectue en présence de tanins condensés ajoutés dans la défibreuse et l'alimentation des fibres en liant s'effectue par procédé « blow-line » et/ou dans un mélangeur.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise en tant que liant une résine aminoplastique, une résine phenol-formaldéhyde, une résine tanin-formaldéhyde, et/ou une colle à base de dlisocyanates.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on ajoute au liant de l'amidon en tant que diluant.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on introduit en tant que Ilant une combinaison de tanin, de formaldéhyde et d'amidon.
  5. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'on introduit en tant que liant des résines réactionnelles méthacrylates.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que les panneaux de fibres fabriqués sont ensuite élaborés en pièces moulées.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on ajoute aux lignocelluloses avant la dissolution du sulfite de sodium, du bisulfite de sodium et/ou de l'hydroxyde de sodium.
  8. Procédé selon la revendication 7, caractérisé en ce que les quantités ajoutées de sulfite de sodium, de bisulfite de sodium et/ou d'hydroxyde de sodium valent entre 0,1% et 2% de matière solide par rapport à l'atro de lignocelluloses.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que le tanin ajouté est un tanin sulfité ou désulfité.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on entrepose ou entrepose à chaud les panneaux fabriqués.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que les panneaux fabriqués présentent une masse volumique d'au moins 1000 kg/m3.
EP06742271A 2005-04-26 2006-04-25 Procede pour fabriquer des panneaux de fibres a moyenne densite et elements de moulage fibreux a emissions polluantes reduites et faible gonflement Not-in-force EP1874513B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06742271T PL1874513T3 (pl) 2005-04-26 2006-04-25 Sposób wytwarzania płyt pilśniowych średniej gęstości i formatek o obniżonej emisji i niskiej podatności na pęcznienie

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005019627A DE102005019627B3 (de) 2005-04-26 2005-04-26 Verfahren zur Herstellung von mitteldichten Faserplatten und Faserformteilen mit verringerter Emission und niedriger Dickenquellung
PCT/DE2006/000728 WO2006114089A1 (fr) 2005-04-26 2006-04-25 Procede pour fabriquer des panneaux de fibres a moyenne densite et elements de moulage fibreux a emissions polluantes reduites et faible gonflement

Publications (2)

Publication Number Publication Date
EP1874513A1 EP1874513A1 (fr) 2008-01-09
EP1874513B1 true EP1874513B1 (fr) 2010-08-11

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EP06742271A Not-in-force EP1874513B1 (fr) 2005-04-26 2006-04-25 Procede pour fabriquer des panneaux de fibres a moyenne densite et elements de moulage fibreux a emissions polluantes reduites et faible gonflement

Country Status (7)

Country Link
EP (1) EP1874513B1 (fr)
AT (1) ATE477095T1 (fr)
DE (2) DE102005019627B3 (fr)
ES (1) ES2349873T3 (fr)
PL (1) PL1874513T3 (fr)
PT (1) PT1874513E (fr)
WO (1) WO2006114089A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007054123B4 (de) * 2006-11-15 2012-03-15 Edmone Roffael Verfahren zur Herstellung von Holzfaserplatten mit verringerter Formaldehydemission, hoher Feuchtebeständigkeit und Hydrolyseresistenz der Verleimung
DE102007038041A1 (de) * 2007-08-10 2009-02-12 Kronotec Ag Verfahren zur Vermeidung der Emission von Aldehyden und flüchtigen organischen Verbindungen aus Holzwerkstoffen
DE102009042361B4 (de) * 2009-09-23 2012-12-20 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Verfahren zur Herstellung von kartonähnlichen Faserplatten aus Holzfasern
DE102015103511B4 (de) 2015-03-10 2018-09-20 Fritz Egger Gmbh & Co. Og Verfahren zur Herstellung eines Holzspanwerkstoffs und darin verwendete Härter für Aminoplaste
IT202000019033A1 (it) * 2020-08-03 2022-02-03 Davide Bertinazzo Metodo per ottenere un precursore di un materiale ibrido legno-inorganico e metodo per ottenere un materiale ibrido legno-inorganico
CN116061285A (zh) * 2022-12-06 2023-05-05 佳诺威集团股份有限公司 一种利用回收板条生产纤维板的工艺方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4327774A1 (de) * 1993-08-18 1995-02-23 Fraunhofer Ges Forschung Verfahren zur Herstellung von mitteldichten Holzfaserplatten (MDF)
DE4431316C1 (de) * 1994-09-02 1996-05-02 Schlingmann Gmbh & Co Verfahren zur Verminderung der Formaldehydabgabe von Holzspan- oder Faserplatten
WO1998037147A2 (fr) * 1997-02-20 1998-08-27 Kronospan Gmbh Composition adhesive et son utilisation
DE10054163A1 (de) * 2000-11-02 2002-06-06 Wacker Polymer Systems Gmbh Verfahren zur Herstellung von Holzpressplatten
DE10124638A1 (de) * 2001-05-18 2002-11-21 Edmone Roffael Verfahren zur Herstellung von mit Tanninformaldehydharzen gebundenen Holzspan-und Holzfaserplatten
DE50109378D1 (de) * 2001-06-12 2006-05-18 Edmone Roffael Verfahren zur Herstellung von feuchtebeständigen Span- und mitteldichten Faserplatten (MDF)
CN1578719A (zh) * 2001-10-29 2005-02-09 後藤新二 再生木材的制造方法
DE10320686B4 (de) * 2003-04-30 2015-02-05 Faurecia Innenraum Systeme Gmbh Verfahren zur Herstellung von Formkörpergrundmaterial

Also Published As

Publication number Publication date
WO2006114089A1 (fr) 2006-11-02
ES2349873T3 (es) 2011-01-12
PT1874513E (pt) 2010-10-25
EP1874513A1 (fr) 2008-01-09
ATE477095T1 (de) 2010-08-15
DE502006007638D1 (de) 2010-09-23
DE102005019627B3 (de) 2006-10-26
PL1874513T3 (pl) 2011-02-28

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