EP1874513A1 - Verfahren zur herstellung von mitteldichten faserplatten und faserformteilen mit verringerter emission und niedriger dickenquellung - Google Patents
Verfahren zur herstellung von mitteldichten faserplatten und faserformteilen mit verringerter emission und niedriger dickenquellungInfo
- Publication number
- EP1874513A1 EP1874513A1 EP06742271A EP06742271A EP1874513A1 EP 1874513 A1 EP1874513 A1 EP 1874513A1 EP 06742271 A EP06742271 A EP 06742271A EP 06742271 A EP06742271 A EP 06742271A EP 1874513 A1 EP1874513 A1 EP 1874513A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tannin
- fibers
- binder
- lignocelluloses
- added
- 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
-
- 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 process for the production of medium-density fiberboard (MDF) with reduced emission of volatile organic compounds (VOC) and at the same time low swelling in thickness.
- MDF medium-density fiberboard
- VOC volatile organic compounds
- volatile organic compounds 5 organic substances are subsumed, the boiling point between 5O 0 C and 26O 0 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, further influencing factors being 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 may be woods, annual plants and used chipboard and fiberboard.
- thermomechanical process TMP process
- CTMP process chemithermomechanical process
- Wood chips washed first to remove any existing sand particles. After washing, the wood chips are usually pre-steamed at temperatures between 60 0 C and 8O 0 C and then get via screw conveyance in the so-called cooker, where they are usually digested at temperatures of 17O 0 C to 180 0 C thermohydrolytic. After digestion, the digested chips are transferred to a pressure refiner, where they are defibrated under pressure at temperatures of also 17O 0 C to 18O 0 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, so lower temperatures of 140 0 C to 16O 0 C can be used for digestion in annual plants.
- 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 7O 0 C and 13O 0 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 the injected binder in the
- the object of the invention is firstly to reduce the amount of volatile constituents of medium-density fiberboard and to largely prevent their formation and secondly to improve the physical and technological properties of the plates produced. In particular, the thickness swelling of the plates should be reduced.
- condensed tannins such as quebracho and acacia bark tannins
- CTMP process when added or present in low optimized amounts during fiber production by the CTMP process in the refiner, not only reduce the emissions of volatile organic compounds from the fibers but also the emission of VOC of plates made diminish, and significantly improve their physical-te "ch ⁇ ⁇ ölög ⁇ schen properties.
- the application of CTMP process alone surprisingly reduces the emission of the manufactured medium density fiberboards but has no appreciable reducing effect on the thickness swelling and water absorption of the plates.
- polyphenolic condensed tannins alone reduces the thickness swelling of the plates, but has no diminishing effect on the emission.
- This method differs from the teaching of EP 1 266 730 A1, which has the object of adding condensed tannins to the wet chips or fibers prior to gluing the chips or fibers.
- the tannins are not present during the digestion, and the fibers do not have to be obtained by the CTMP process.
- digestion by the CTMP method is as obligatory as the addition of optimized amounts of condensed tannins.
- the polyphenolic condensed tannins may be added to the refiner along with other additives such as water repellents and / or other polyphenolic materials such as cashew nut oils.
- Tannins on the emission of the produced plates of formaldehyde also after their production stops.
- 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.
- pine wood chips were used at a temperature of
- 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 17O 0 C.
- the production of MDF was carried out under the same conditions as in the case of TMP fibers (see Experiment 1).
- Wood material was added.
- the digestion temperature was also 17O 0 C.
- Table 1 Physico-technological properties of TMP and CTMP medium density fiberboards produced without and with the addition of condensed tannins
- VOC emissions (hexanal, pentanal) of TMP and CTMP medium density fiberboard (MDF) made without and with the addition of condensed tannins.
- MDF medium density fiberboard
- Table 3 Formaldehyde release (24 hours) (mg / 1000 g dry fibers) from TMP and CTMP fibers made without and with the addition of condensed tannins
- binders for the production of medium-density fiberboards 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 (MU PF resins) and adhesives based on PMDI (polymeric diphenylmethane diisocyanates). Binders that result in low moisture resistance fiber-to-fiber bonding include the 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)
Description
Claims
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 (de) | 2005-04-26 | 2006-04-25 | Verfahren zur herstellung von mitteldichten faserplatten und faserformteilen mit verringerter emission und niedriger dickenquellung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1874513A1 true EP1874513A1 (de) | 2008-01-09 |
EP1874513B1 EP1874513B1 (de) | 2010-08-11 |
Family
ID=36616885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06742271A Not-in-force EP1874513B1 (de) | 2005-04-26 | 2006-04-25 | Verfahren zur herstellung von mitteldichten faserplatten und faserformteilen mit verringerter emission und niedriger dickenquellung |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1874513B1 (de) |
AT (1) | ATE477095T1 (de) |
DE (2) | DE102005019627B3 (de) |
ES (1) | ES2349873T3 (de) |
PL (1) | PL1874513T3 (de) |
PT (1) | PT1874513E (de) |
WO (1) | WO2006114089A1 (de) |
Families Citing this family (6)
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)
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 (en) * | 1997-02-20 | 1998-08-27 | Kronospan Gmbh | Adhesive composition and its use |
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 |
ATE321636T1 (de) * | 2001-06-12 | 2006-04-15 | Edmone Roffael | Verfahren zur herstellung von feuchtebeständigen span- und mitteldichten faserplatten (mdf) |
DE60228747D1 (de) * | 2001-10-29 | 2008-10-16 | Shinji Gotou | Verfahren zur herstellung von recyceltem bauholz |
DE10320686B4 (de) * | 2003-04-30 | 2015-02-05 | Faurecia Innenraum Systeme Gmbh | Verfahren zur Herstellung von Formkörpergrundmaterial |
-
2005
- 2005-04-26 DE DE102005019627A patent/DE102005019627B3/de not_active Expired - Fee Related
-
2006
- 2006-04-25 AT AT06742271T patent/ATE477095T1/de active
- 2006-04-25 EP EP06742271A patent/EP1874513B1/de not_active Not-in-force
- 2006-04-25 ES ES06742271T patent/ES2349873T3/es active Active
- 2006-04-25 PL PL06742271T patent/PL1874513T3/pl unknown
- 2006-04-25 PT PT06742271T patent/PT1874513E/pt unknown
- 2006-04-25 WO PCT/DE2006/000728 patent/WO2006114089A1/de not_active Application Discontinuation
- 2006-04-25 DE DE502006007638T patent/DE502006007638D1/de active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2006114089A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE502006007638D1 (de) | 2010-09-23 |
EP1874513B1 (de) | 2010-08-11 |
WO2006114089A1 (de) | 2006-11-02 |
PT1874513E (pt) | 2010-10-25 |
DE102005019627B3 (de) | 2006-10-26 |
PL1874513T3 (pl) | 2011-02-28 |
ES2349873T3 (es) | 2011-01-12 |
ATE477095T1 (de) | 2010-08-15 |
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