EP1799412A1 - Verfahren zur verminderung der abgabe von flüchtigen organischen verbindungen (voc) aus holz und holzzerkleinerungsprodukten und aus daraus hergestellten holzwerkstoffen, insbesondere holzspanplatten - Google Patents
Verfahren zur verminderung der abgabe von flüchtigen organischen verbindungen (voc) aus holz und holzzerkleinerungsprodukten und aus daraus hergestellten holzwerkstoffen, insbesondere holzspanplattenInfo
- Publication number
- EP1799412A1 EP1799412A1 EP05813055A EP05813055A EP1799412A1 EP 1799412 A1 EP1799412 A1 EP 1799412A1 EP 05813055 A EP05813055 A EP 05813055A EP 05813055 A EP05813055 A EP 05813055A EP 1799412 A1 EP1799412 A1 EP 1799412A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wood
- strands
- chips
- treated
- alkali
- 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
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
Definitions
- VOC volatile organic compounds
- the invention relates to a process for reducing the emission of volatile organic compounds (VOCs) from wood and from wood pulp products such as wood shavings, wood strands, wood fibers and wood veneers, in particular from softwood, and from wood-based materials produced therefrom.
- VOCs volatile organic compounds
- the volatile organic compounds are classified according to their boiling point or vapor pressure as very volatile organic compounds (WOCs), volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs).
- WOCs very volatile organic compounds
- VOCs volatile organic compounds
- SVOCs semi-volatile organic compounds
- To the volatile organic compounds (VVOC) include compounds having a boiling point below 50 0 C. These include formic acid and formaldehyde.
- volatile organic compounds (VOC) are those volatile subsumed organics with boiling points between about 50 0 C and 260 0 C.
- the VOCs include acetic acid and terpenes.
- the VOC are air pollutants, certain VOC cause eg odor nuisance and can have toxicological effects on living things.
- the VOCs are mainly derived from the ingredients (extractives) of the wood or its transformation products and, where appropriate, the degradation products of the main components of the wood (lignin, celluloses, hemicelluloses).
- the VOCs include wood components such as ⁇ -pinene, ⁇ -pinene, ⁇ 3 -caren, which mainly escape from the wood of the coniferous trees.
- Modification products of the ingredients include pentanal, hexanal, etc. From the hemicelluloses, acetic and formic acid can be formed.
- softwoods contain ingredients (extractives) such as resins and fats, which lead to the formation of volatile organic terpene compounds and aldehydes such as pentanal and hexanal.
- Hardwoods release mainly acetic and formic acid.
- the chemical composition and amount of VOC depends on many factors, in particular the type of wood, the treatment of the wood, the storage period and the storage conditions of the wood or its shredded products, as well as from the drying conditions. Furthermore, in wood-based materials, the binder influences the emission of VOCs.
- Volatile organic compounds can escape from the wood and the wood comminution products and wood-based materials produced therefrom.
- wood materials made from wood chippings such as wood shavings, wood strands, wood fibers and wood veneers by known methods, volatile organic compounds are released during manufacture, after production and when used.
- wood-based materials such as Oriented Strand Boards (OSB), which are mainly produced in Europe from mostly un-stored softwoods such as pine and Douglas fir, can still produce large amounts of volatile organic compounds after production.
- OSB Oriented Strand Boards
- the nature and extent of the emission of VOCs from wood-based materials is additionally determined, inter alia, by the type of wood and, in particular, by the production technology and the binder used.
- PF resins alkaline curing phenol-formaldehyde resins
- volatile organic compounds having unsaturated carbon-to-carbon bonds can react with the atmospheric oxygen under ambient conditions.
- VOCs oxygen
- O 2 oxygen
- the wood shredded products or the wood-based materials odor-intensive compounds can be obtained. fertilize arise.
- OSB Oriented Strand Boards
- the odor can be particularly unpleasant and concise. This is particularly true when the wood, as is usually the case, is used without prior storage for wood-based material production.
- VOC volatile organic compounds
- the object is achieved in that wood and / or wood shredded products are treated with suitable chemical substances that react with the wood and / or the wood shred products, in particular with the moisture of the wood or with the water in the wood.
- suitable chemical substances that react with the wood and / or the wood shred products, in particular with the moisture of the wood or with the water in the wood.
- the adjusting by reaction with the wood moisture pH should be above 7, in particular above 9.
- Possible suitable substances which cause such a reaction are bases such as sodium hydroxide (NaOH), basic salts such as sodium carbonate (Na 2 COs), sodium sulfite (Na 2 SO 3 ) and tri-sodium phosphate (Na 3 PO 4 ) , Even gases such as ammonia, which lead to pH values higher than 7 after a reaction with water, can be used for this purpose.
- the pH can be adjusted due to a reaction of the alkali with the ingredients or free or liberated wood acids below the theoretically expected by reaction of the alkali with the moisture content of wood.
- other agents well known to those skilled in the art may be used to effect an increase in the pH of the wood.
- the treatment of the wood or its shredded products can be carried out for the production of wood-based materials before or after storage of the wood.
- the lignocelluloses can be washed after the aforementioned treatment and before the gluing with water or with aqueous solutions.
- the treatment is usually carried out at room temperature and under atmospheric pressure.
- alkali such as sodium hydroxide
- PF resins alkaline phenol-formaldehyde resins
- Schmidt-Hellerau (1968) investigated the influence of the addition of a 50% sodium hydroxide solution to the binder immediately prior to gluing or after drying the shavings of the extractable sweet chestnut on the physical-technological properties of particleboard made from it (Schmidt-Hellerau , Ch., 1968: Possibilities for Improving the Quality of Phenolic Chipboards, Holz-Zentralblatt 94: 1327).
- alkali in amounts up to 20% (based on wood) to the already alkaline PF resins had the aim to increase the alkali balance of the binder topipepuffem acids in the highly acidic Kastanienholzs Georgnen.
- the alkali is added to the wood or wood chips before drying and gluing and not to the binder (e.g., phenolic resin).
- the binder e.g., phenolic resin
- Roffael and Parameswaran (1984) have beech wood with 6% ammonia solution at 100 0 C for 3 hours in an autoclave and then washed the chips until neutral. This treatment led to an increase in the nitrogen content in the wood and to the buffering of the acids contained therein as well as to a partial degradation of the hemicelluloses (Parameswaran, N. and Roffael, E., 1984: state of knowledge and investigation results on the effect of ammonia on wood chips. and Material 42: 327-333).
- the wood or wood crushing products may be both conifers and hardwoods. Even mixtures of these two wood types are possible.
- the wood shavings and strands of conifers come from.
- the wood-based materials produced from the lignocellulose-containing materials can be chipboard, such as OSB.
- the plates produced can be one or more layers. Furthermore, the other layers may also contain other lignocelluloses such as straw or bark.
- binders include phenol-formaldehyde resin (PF resin), diisocyanate-based adhesive (PMDI), melamine-urea-phenol-formaldehyde resin (MUPF resin) and / or tannin-formaldehyde resin (TF resin), or a mixture thereof.
- PF resin phenol-formaldehyde resin
- PMDI diisocyanate-based adhesive
- MUPF resin melamine-urea-phenol-formaldehyde resin
- TF resin tannin-formaldehyde resin
- the wood-based materials produced from the treated lignocellulose-containing materials may additionally be post-treated with alkali, such as sodium hydroxide, sodium sulfite, trisodium phosphate and sodium carbonate and mixtures thereof after production.
- alkali such as sodium hydroxide, sodium sulfite, trisodium phosphate and sodium carbonate and mixtures thereof after production.
- the aftertreatment can also be done by ammonia gas.
- the method according to the invention can also include a further alkali treatment after drying.
- the treatment according to the invention of the wood or of the wood shredded products can take place before or after storage of the wood.
- the wood or the wood shredded products may optionally be washed with water or aqueous solutions.
- the alkali compounds such as sodium hydroxide, sodium sulfite or sodium carbonate used to increase the pH can be applied or impregnated by spraying or by other known methods on the wood or the wood crushing products.
- the value of the incorporated compound to increase the pH in a range of 0.1% to 2% solids on atro chips.
- the invention aims to develop a simple method for reducing the release of volatile organic compounds (VOC) from wood and wood chippings and from wood-based materials produced therefrom.
- VOC volatile organic compounds
- the core and sapwood strands were sprayed in one case with 2% sodium sulfite solution and in another case with 2% sodium hydroxide solution.
- the dosage of sodium sulfite or sodium hydroxide was in each case at 1, 5% solids based on absolutely dry (atro) strands.
- the treated strands were air dried without being washed. As a reference served on the air dried untreated core and sapwood strands of pine.
- VOC volatile organic compounds
- Table 2 Influence of treatment of pine core and sapwood strands (Pinus sylvestris L) with sodium sulphite (1.5% solids on dry beach) on the concentrations ( ⁇ g / m 3 ) of volatile organic compounds (VOC) after 5 h , 24 h and 48 h in a 23 liter test chamber at 23 ° C and 50% relative humidity (degree of loading: 0.5 m 2 / m 3 , air exchange rate: 0.5 h "1 )
- part of the core and sapwood strands were treated with sodium hydroxide solution.
- the treatment was carried out by first loading the strands in a gluing drum with 7.5% sodium hydroxide solution (dosage 1.5% solids based on absolutely dry (atro) strands). Subsequently, the strands were dried in a drying oven at a temperature of 5O 0 C to a moisture content of about 6%.
- the untreated core or sapwood strands were each precoated in a gluing drum with an amount of water corresponding to the above-mentioned sodium hydroxide solution dosage. Subsequently, the strands were dried in a drying oven at a temperature of 5O 0 C to a moisture content of about 6%.
- OSB Oriented Strand Boards
- VOC emissions were determined after storage for 24 hours in a 1 m 3 test chamber at 23 ° C and 50% relative humidity.
- the loading level of the test chamber was 0.5 ⁇ rVm 3
- the air exchange rate was 0.5 h-1.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL05813055T PL1799412T3 (pl) | 2004-10-15 | 2005-10-12 | Sposób zmniejszania uwalniania lotnych związków organicznych (LZO) z produktów z drewna i wiórów drewnianych, oraz pochodzących od nich materiałów drewnianych, w szczególności płyt wiórowych |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004050406 | 2004-10-15 | ||
PCT/DE2005/001830 WO2006039914A1 (de) | 2004-10-15 | 2005-10-12 | Verfahren zur verminderung der abgabe von flüchtigen organischen verbindungen (voc) aus holz und holzzerkleinerungsprodukten und aus daraus hergestellten holzwerkstoffen, insbesondere holzspanplatten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1799412A1 true EP1799412A1 (de) | 2007-06-27 |
EP1799412B1 EP1799412B1 (de) | 2011-01-19 |
Family
ID=35976663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05813055A Not-in-force EP1799412B1 (de) | 2004-10-15 | 2005-10-12 | Verfahren zur verminderung der abgabe von flüchtigen organischen verbindungen (voc) aus holz und holzzerkleinerungsprodukten und aus daraus hergestellten holzwerkstoffen, insbesondere holzspanplatten |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1799412B1 (de) |
AT (1) | ATE495866T1 (de) |
DE (1) | DE502005010889D1 (de) |
PL (1) | PL1799412T3 (de) |
WO (1) | WO2006039914A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009000109A1 (de) * | 2008-06-27 | 2009-12-31 | BAM Bundesanstalt für Materialforschung und -prüfung | Verfahren zur Emissionsminderung von Holz und Holzwerkstoffen |
DE102009046127A1 (de) | 2008-10-28 | 2010-04-29 | Institut Für Holztechnologie Dresden Gemeinnützige Gmbh | Verfahren zur Herstellung von Holzfaserwerkstoffen sowie Holzfaserwerkstoffe mit verringerter Emission an flüchtigen VOC |
DE102011104025A1 (de) | 2010-06-11 | 2011-12-15 | Technische Universität Dresden | Verfahren zur Modifizierung von Holz oder Holzwerkstoffen sowie chemisch und thermisch modifiziertes Holz |
DE102012020842B4 (de) | 2012-10-24 | 2017-06-29 | Fritz Egger Gmbh & Co. Og | Verfahren zur Herstellung eines Holzwerkstoffs |
DE102013001678A1 (de) | 2013-01-31 | 2014-07-31 | INNOLYSIA GbR (vertretungsberechtigte Gesellschafterin: Virginie Soua, 53639 Königswinter) | Reduzierung der Schadstoffemission von Holzwerkstoffen |
DE102014114921A1 (de) | 2013-10-14 | 2015-04-16 | Hochschule für Nachhaltige Entwicklung Eberswalde | Verfahren zur Herstellung eines emissionsreduzierten Massivholzproduktes oder eines emissionsreduzierten, holzhaltigen Ausgangsstoffes sowie emissionsreduzierte Massivholzprodukte oder emissionsreduzierte, holzhaltige Ausgangsstoffe |
WO2019117799A1 (en) * | 2017-12-15 | 2019-06-20 | Nsr Ab | Hybrid resin particle-board |
EP4023812A1 (de) | 2020-12-29 | 2022-07-06 | MM BOARD & PAPER GmbH | Verfahren zur herstellung von produkten auf basis von holz als rohstoff |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3222195A1 (de) * | 1982-06-12 | 1983-12-15 | Basf Ag, 6700 Ludwigshafen | Verfahren zur herstellung von spanholzwerkstoffen mit verringerter formaldehydemission |
US4514255A (en) * | 1983-08-19 | 1985-04-30 | Borden, Inc. | Process for the manufacture of dried, resin-treated fiber furnish |
CA1269602A (en) * | 1984-09-18 | 1990-05-29 | Raymond A. Young | Base-activated wood polymer adhesive system |
DD242193A1 (de) * | 1985-11-06 | 1987-01-21 | Univ Dresden Tech | Verfahren zur erzeugung von holzwerkstoffen |
US4678686A (en) * | 1986-04-15 | 1987-07-07 | Park David W | Treatment of formaldehyde-containing wood panel products |
FR2619741B1 (fr) * | 1987-06-23 | 1992-09-04 | Guidat Gilbert | Installation industrielle pour la production en flux continu de parcelles ou particules stabilisees a partir de dechets de bois |
SE470330B (sv) * | 1992-06-11 | 1994-01-24 | Sunds Defibrator Ind Ab | Förfarande för framställning av fiberboard enligt torra metoden |
DE4327774A1 (de) * | 1993-08-18 | 1995-02-23 | Fraunhofer Ges Forschung | Verfahren zur Herstellung von mitteldichten Holzfaserplatten (MDF) |
US7371787B2 (en) * | 2000-04-14 | 2008-05-13 | Viance, Llc | Methods of incorporating treatment agents into wood based composite products |
ATE321636T1 (de) * | 2001-06-12 | 2006-04-15 | Edmone Roffael | Verfahren zur herstellung von feuchtebeständigen span- und mitteldichten faserplatten (mdf) |
DE10160316A1 (de) * | 2001-12-07 | 2003-06-26 | Ihd Inst Fuer Holztechnologie | Verfahren zur Herstellung von Faserplatten mit erhöhter Feuchtebeständigkeit nach dem Trockenverfahren |
-
2005
- 2005-10-12 PL PL05813055T patent/PL1799412T3/pl unknown
- 2005-10-12 WO PCT/DE2005/001830 patent/WO2006039914A1/de active Application Filing
- 2005-10-12 AT AT05813055T patent/ATE495866T1/de active
- 2005-10-12 DE DE502005010889T patent/DE502005010889D1/de active Active
- 2005-10-12 EP EP05813055A patent/EP1799412B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2006039914A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE495866T1 (de) | 2011-02-15 |
DE502005010889D1 (de) | 2011-03-03 |
PL1799412T3 (pl) | 2011-06-30 |
EP1799412B1 (de) | 2011-01-19 |
WO2006039914A1 (de) | 2006-04-20 |
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