EP3620282A1 - Procédé de fabrication de panneaux en matériaux dérivés du bois osb à faible émission de composés organiques volatils (cov) - Google Patents

Procédé de fabrication de panneaux en matériaux dérivés du bois osb à faible émission de composés organiques volatils (cov) Download PDF

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Publication number
EP3620282A1
EP3620282A1 EP19201042.9A EP19201042A EP3620282A1 EP 3620282 A1 EP3620282 A1 EP 3620282A1 EP 19201042 A EP19201042 A EP 19201042A EP 3620282 A1 EP3620282 A1 EP 3620282A1
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EP
European Patent Office
Prior art keywords
wooden
wood
strands
steam
treated
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EP19201042.9A
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German (de)
English (en)
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EP3620282B1 (fr
Inventor
Norbert Kalwa
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Swiss Krono Tec AG
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Swiss Krono Tec AG
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Priority to EP19201042.9A priority Critical patent/EP3620282B1/fr
Priority to PT192010429T priority patent/PT3620282T/pt
Priority to PL19201042T priority patent/PL3620282T3/pl
Priority to ES19201042T priority patent/ES2904805T3/es
Priority to HUE19201042A priority patent/HUE057379T2/hu
Publication of EP3620282A1 publication Critical patent/EP3620282A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K1/00—Damping wood
    • B27K1/02—Apparatus
    • 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
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/001—Heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/007—Treating of wood not provided for in groups B27K1/00, B27K3/00 using pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/04—Combined bleaching or impregnating and drying of wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/007—Combined with manufacturing a workpiece
    • 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
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • 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
    • 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
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/143—Orienting the particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2200/00—Wooden materials to be treated
    • B27K2200/10—Articles made of particles or fibres consisting of wood or other lignocellulosic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2200/00—Wooden materials to be treated
    • B27K2200/15—Pretreated particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2240/00—Purpose of the treatment
    • B27K2240/10—Extraction of components naturally occurring in wood, cork, straw, cane or reed

Definitions

  • the present invention relates to a method for treating wooden beaches with water vapor according to claim 1, a device for carrying out the water vapor treatment according to claim 7, a method for producing OSB wood-based panels according to claim 10 and a production line for producing OSB-based wood panels according to claim 14.
  • Coarse chipboard also called OSB (oriented strand boards), are wood-based panels that are made from long chips (strands). OSB boards are increasingly used in timber and prefabricated houses, as OSB boards are light and still meet the structural requirements placed on building boards. OSB panels are used as building panels and as wall or roof cladding or in the floor area.
  • the OSB boards are produced in a multi-stage process, with the chips or strands made from debarked logs, preferably softwood, being peeled off in the longitudinal direction by rotating knives.
  • the natural moisture of the beaches is reduced at high temperatures.
  • the moisture level of the strands can vary depending on the adhesive used, whereby the moisture should be well below 10% in order to avoid splitting during later pressing. Depending on the adhesive, wetting on rather damp or dry strands may be cheaper.
  • as little moisture as possible should be present in the beaches during the pressing process in order to largely reduce the steam pressure generated during the pressing process, since this could otherwise cause the raw plate to burst.
  • the strands After the strands have dried, they are introduced into a gluing device in which the glue or adhesive is applied to the chips in finely divided form.
  • PMDI polymeric diphenylmethane diisocyanate
  • MUPF melamine-urea-phenol-formaldehyde
  • glues are predominantly used for gluing.
  • the glues can also be used mixed in the OSB boards. These glues are used because, as mentioned above, the OSB boards are often used for structural applications. Moisture or moisture-resistant glues must be used there.
  • the glued strands are scattered alternately lengthways and crossways to the production direction, so that the strands are arranged crosswise in at least three layers (lower cover layer - middle layer - upper cover layer).
  • the scattering direction of the lower and upper cover layer is the same, but differs from the scattering direction of the middle layer.
  • the beaches used in the top and middle layers also differ from one another.
  • the strands used in the cover layers are flat and the strands used in the middle layer are less flat to chip-like.
  • two strands of material are used in the production of the OSB boards: one with flat strands for the later top layers and one with "chips" for the middle layer.
  • the strands in the middle layer can be of poor quality, since the bending strength is essentially generated by the cover layers. That is why fines that are produced during machining can also be used in the middle layer of OSB panels.
  • the percentage distribution between the middle and top layers is at least 70% to 30%.
  • OSB panels are becoming increasingly popular and versatile due to their sustainability, for example as a construction element in house construction or as formwork in concrete construction.
  • the hygroscopic properties inherent in the wood-based materials have a disadvantageous effect in some applications.
  • volatile organic compounds also called VOCs
  • volatile organic compounds include volatile organic substances which evaporate easily or are already present as a gas at lower temperatures, such as at room temperature.
  • the volatile organic compounds are either already present in the wood material and are released from it during processing or they become According to the current state of knowledge, it is formed by the degradation of unsaturated fatty acids, which in turn are decomposition products of the wood.
  • Typical conversion products that occur during processing are, for example, pentanal and hexanal, but also octanal, 2-octenal or 1-heptenal.
  • conifers, from which OSB boards are mainly manufactured contain large amounts of resin and fats, which lead to the formation of volatile organic terpene compounds and aldehydes.
  • VOC like the aldehydes mentioned, can also arise or be released when using certain adhesives for the production of the wood-based materials.
  • OSB material boards The emission of ingredients in OSB material boards is particularly critical because this material is mainly used uncoated. This allows the ingredients to evaporate unhindered.
  • OSB panels are often used for cladding / planking large areas, which usually results in a high room load (m 2 OSB / m 3 indoor air). This also leads to a concentration of certain substances in the room air.
  • VOC scavengers are almost always added after the strands have dried, as this or the temperature exposure in the press was thought to be the cause of the majority of the emissions.
  • the VOC scavengers were added in liquid form via the gluing system, and solids were added at various points in the process (e.g. scattering). This required an additional installation of dosing stations, which should ensure a homogeneous distribution.
  • the invention is based on the technical problem of improving the known process for the production of OSB material boards in order to produce OSB material boards easily and safely with a significantly reduced emission of volatile organic compounds (VOCs). At least the emission of the terpenes should be reduced. If possible, the manufacturing process should be changed as little as possible and the costs should not increase disproportionately. Furthermore, the solution should include the greatest possible flexibility. Ultimately, ecological aspects should also be taken into account. H. the solution should not generate additional energy consumption or generate additional waste.
  • Another technical task was to design a system that enables easy treatment of the beaches to reduce VOC emissions. This should be integrated into the production process and not disrupt or make the production of the OSB more expensive. The technical effort for the treatment should also not lead to an increase in safety measures or contain a greater risk potential.
  • a method for the treatment of wood strands suitable for the production of OSB boards, in particular with the aim of reducing the VOC emission from these wood strands is provided, the wood strands being treated with steam after being obtained from suitable woods without drying, the Water vapor with a temperature between 80 ° C and 120 ° C and a pressure between 0.5 bar and 2 bar is passed over the wooden strands.
  • the treatment of the wooden beaches with water vapor takes place in such a way that the water vapor has a temperature between 90 ° C. and 110 ° C., particularly preferably 100 ° C., at a pressure between 0.7 bar and 1.5 bar. is particularly preferably passed over the wooden strands at 1 bar (atmospheric pressure).
  • the water vapor treatment takes place at the temperature-dependent pressure with which the water vapor is introduced into the treatment device.
  • steam treatment at normal pressure temperature of the introduced steam of 100 ° C.
  • an additional (external) pressure i.e. in addition to the pressure with which water vapor enters the system
  • no pressure vessels such as an autoclave or a pressure chamber
  • the steam treatment of the wooden beaches is carried out in a low-oxygen atmosphere or with the greatest possible exclusion of oxygen.
  • the present steam treatment of the wooden beaches is carried out in a separate steam treatment device.
  • the steam treatment takes place outside of a chipper (e.g. knife ring chipper or disc chipper) and is therefore not part of the chipping or shredding process for wood to produce wooden strands. It is also essential that the steam treatment can be carried out before the wooden beaches dry.
  • a chipper e.g. knife ring chipper or disc chipper
  • no additives are added to the water vapor: in particular, no bleaching agents, such as bisulfites or oxygen-releasing substances, are added. But there is also no need to add other VOC scavengers to the binder.
  • the steam treatment of the wooden beaches takes place over a period of 5 to 30 minutes, preferably 10 to 20 minutes, particularly preferably 15 minutes.
  • the maximum amount of steam is 1 kg steam / kg strands (atro).
  • the duration of the water vapor treatment is primarily determined by the speed of the transport device on which the wooden strands are guided through the water vapor treatment device in a continuous manner.
  • the water vapor is collected as condensate after passing through the wooden beaches. It is advantageous that the loading of the condensate with organic compounds is relatively low.
  • the COD chemical oxygen demand
  • the wooden strands used here can have a length between 50 to 200 mm, preferably 70 to 180 mm, particularly preferably 90 to 150 mm; a width between 5 to 50 mm, preferably 10 to 30 mm, particularly preferably 15 to 20 mm; and have a thickness between 0.1 and 2 mm, preferably between 0.3 and 1.5 mm, particularly preferably between 0.4 and 1 mm.
  • the wooden beaches e.g. a length between 150 and 200 mm, a width between 15 and 20 mm, a thickness between 0.5 and 1 mm and a humidity of max. 50% on.
  • the at least one housing can be in the form of a metal tube or tubular body.
  • the at least one transport device consists of at least one transport belt.
  • the conveyor belt should Have perforations or other openings so that the water vapor can be guided from the top of the conveyor belt past the wooden beaches to the bottom of the conveyor belt.
  • the wooden strands are distributed on the conveyor belt so that a homogeneous flow of water vapor through the wooden strands is possible.
  • more than one spray is provided on the water vapor feed line.
  • the number of spraying agents is particularly dependent on the total length of the housing.
  • the spraying means can also be controlled individually, so that the required amount of water vapor can be specifically adjusted.
  • Nozzles or other suitable injectors can be used as spraying means, which enable uniform spraying and uniform distribution of the water vapor on and between the wooden beaches.
  • the water vapor is collected as condensate after passing through the wooden beaches.
  • at least one means for collecting the condensate is provided in the evaporation system below the conveyor belt (based on the direction of flow of the water vapor).
  • the tubular body can be angled upward in the feed direction.
  • the condensate collected in this way contains wood constituents washed out from the wooden beaches, in particular aldehydes, organic acids and / or terpenes, in particular those which have a certain water solubility.
  • the steam-treated beaches After leaving the steam treatment device, the steam-treated beaches have a temperature of 80 to 90 ° C. At this temperature, the wood strands from the steam treatment station enter a dryer (as part of the production line for OSB panels), which leads to an increase in dryer performance. The energy that is used to remove wood constituents is then used for the drying process. In a normal process, the inlet temperature of the strands in the dryer is around 25 ° C.
  • the present method enables the production of OSB wood-based panels using steam-treated wooden strands, which are introduced into a known manufacturing process in addition or as an alternative to untreated wooden strands.
  • An OSB wood-based panel produced with the method according to the invention and comprising steam-treated wooden strands has a reduced emission of volatile organic compounds, in particular of terpenes and aldehydes.
  • the production of OSB is changed compared to the conventional OSB production process in such a way that at least some of the strands used are treated with steam before they are dried.
  • the beaches can be those intended for the top or middle class.
  • the strands of the drying performed as standard. This is done e.g. B. immediately before the gluing, whereby a complete substitution or only a partial substitution of the standard beaches can take place.
  • steam-treated wood strands or a mixture of steam-treated wood strands and non-steam-treated wood strands are used as the middle layer and / or top layer of the OSB wood-based panel.
  • the steam-treated wooden strands being used in the middle layer and in one or both outer layers or in all layers.
  • only one or both cover layers are formed from water-vapor-treated wooden strands, and dried and non-steam-treated wooden strands are used for the middle layer.
  • the mixture can comprise between 10 and 50% by weight, preferably between 20 and 30% by weight of untreated or non-steam-treated wooden beaches and between 50 and 90% by weight, preferably between 70 and 80% by weight of water-steam treated wooden beaches.
  • the step of steam treatment of the wooden beaches can be carried out separately from the manufacturing process of the OSB wood-based panels.
  • the water vapor treatment takes place outside the overall process or the process line.
  • the wooden beaches are removed from the manufacturing process and into the Steam treatment device (eg steaming system) introduced.
  • the steam-treated wooden beaches can be reinserted into the conventional manufacturing process, if necessary after intermediate storage, for example immediately before gluing. This enables a high degree of flexibility in the manufacturing process.
  • the steam treatment of the wooden beaches can be integrated into the manufacturing process of the OSB wood-based panels, i.e.
  • the steam treatment step is integrated into the overall process or process line and takes place online.
  • the steam treatment can i) take place immediately after the cutting and preparation of the wooden strands or ii) only after the sifting and separation of the wooden strands in accordance with the use of the wooden strands for the middle or top layer.
  • a separate steam treatment of the wooden strands can be carried out according to the requirements for the wooden strands used in the middle and top layers.
  • the steam treatment of the wooden beaches is carried out in at least one steaming system, preferably in two steaming systems.
  • the vapor deposition system used here can exist or function as a batch system or as a continuously operated system, a continuously operated system being preferred.
  • the steam treatment of wood strands used for the middle layer and the top layers of the OSB wood-based panel can each be carried out separately in at least two steaming systems.
  • This enables the degree of water vaporization of the water vapor-treated wooden strands used in the middle and / or top layer to be adapted to the respective requirements and customer requirements.
  • the two vapor deposition systems used are preferably connected or arranged in parallel.
  • the contacting of the wooden strands with the at least one binder in step d) is preferably carried out by spraying or spraying the binder onto the wooden strands.
  • Many OSB systems work with rotating coils (drums with atomizer gluing). Mixer gluing would also be possible.
  • the strands are intimately mixed with the glue in a mixer by rotating blades.
  • a polymer adhesive is preferably used as the binder, which is selected from the group comprising formaldehyde adhesives, such as urea-formaldehyde resin adhesive (UF) and / or melamine-formaldehyde resin adhesive (MF), polyurethane adhesives , Epoxy resin adhesives, polyester adhesives.
  • formaldehyde adhesives such as urea-formaldehyde resin adhesive (UF) and / or melamine-formaldehyde resin adhesive (MF), polyurethane adhesives , Epoxy resin adhesives, polyester adhesives.
  • formaldehyde adhesives such as urea-formaldehyde resin adhesive (UF) and / or melamine-formaldehyde resin adhesive (MF), polyurethane adhesives , Epoxy resin adhesives, polyester adhesives.
  • the polyurethane adhesive is preferred, the polyurethane adhesive being based on aromatic polyisocyanates, in particular polydiphenylmethane diisocyanate (
  • the steam-treated and non-steam-treated wooden strands are glued with a binder amount of 1.0 to 5.0% by weight, preferably 2 to 4% by weight, in particular 3% by weight (based on the total amount of the wooden strands).
  • the flame retardant can typically be added in an amount between 1 and 20% by weight, preferably between 5 and 15% by weight, particularly preferably ⁇ 10% by weight, based on the total amount of the wooden beaches.
  • Typical flame retardants are selected from the group comprising phosphates, sulfates, borates, in particular ammonium polyphosphate, tris (tri-bromoneopentyl) phosphate, zinc borate or boric acid complexes of polyhydric alcohols.
  • the glued (water vapor-treated and / or non-water vapor-treated) wooden strands are sprinkled onto a conveyor belt to form a first cover layer along the direction of transport, then to form a middle layer transverse to the direction of transport and finally to form a second cover layer along the direction of transport.
  • the glued wood strands are pressed at temperatures between 200 and 250 ° C, preferably 220 and 230 ° C, to form an OSB wood-based panel.
  • the present method enables the production of an OSB wood-based panel with reduced emission of volatile organic compounds (VOCs), which comprises steam-treated wooden beaches.
  • VOCs volatile organic compounds
  • the present OSB wood-based panel can consist entirely of steam-treated wooden strands or a mixture of steam-treated and non-steam-treated wooden strands.
  • both top layers and the middle layer of the OSB consist of steam-treated wooden strands
  • the two top layers consist of non-steam-treated wooden strands and the middle layer consists of steam-treated wooden strands
  • the two top layers consist of steam-treated wooden strands and the middle layer from non-steam treated wooden beaches.
  • the present OSB wood-based panel can have a bulk density between 300 and 1000 kg / m 3 , preferably between 500 and 800 kg / m 3 , particularly preferably between 500 and 600 kg / m 3 .
  • the thickness of the present OSB wood-based panel can be between 5 and 50 mm, preferably between 10 and 40 mm, a thickness between 15 and 25 mm being preferred in particular.
  • the OSB wood-based panel produced with the present method has, in particular, a reduced emission of aldehydes released during the wood digestion, in particular pentanal or hexanal, and / or terpenes, in particular carene and pinene.
  • Aldehydes are released during the machining process and the associated aqueous processing and cleaning of the wooden beaches.
  • Specific aldehydes can be formed from the basic building blocks of cellulose or hemicellulose.
  • the aldehyde furfural is formed from mono- and disaccharides of cellulose or hemicellulose, while aromatic aldehydes can be released from lignin.
  • the aliphatic aldehydes (saturated and unsaturated) are formed by the fragmentation of fatty acids with the participation of oxygen.
  • C 2 -C 10 aldehydes particularly preferably acetaldehyde, pentanal, hexanal or furfural
  • released terpenes in particular C 10 monoterpenes and C 15 sesquiterpenes, in particular preferably acyclic or cyclic monoterpenes in the OSB wood-based panels.
  • Typical acyclic terpenes are terpene hydrocarbons such as myrcene, terpene alcohols such as gerianol, linaool, ipsinol and terpene aldehydes such as citral.
  • Typical representatives of the monocyclic terpenes are p-menthan, terpeninol, limonene or carvone, and typical representatives of the bicyclic terpenes are carane, pinane, bornane, 3-carene and ⁇ -pinene being of particular importance.
  • Terpenes are constituents of tree resins and are therefore particularly present in tree species containing resin, such as pine or spruce.
  • Organic acids in particular the emission of acetic acid from OSB wood-based panels can also be reduced.
  • Organic acids are obtained in particular as cleavage products of the wood constituents cellulose, hemicellulose and lignin, alkane acids such as acetic acid and propionic acid or aromatic acids preferably being formed.
  • the vapor deposition system can be designed continuously.
  • the wooden strands are applied to a conveyor belt, which guides the wooden strands through the steaming system at a predetermined speed.
  • the wooden strands are sprayed evenly with water vapor, which is introduced from nozzles provided above the conveyor belt.
  • the steaming system can be provided upstream (upstream) of the device for classifying and separating the wooden strands.
  • upstream of the device for classifying and separating the wooden strands.
  • all wooden beaches are subjected to steam treatment.
  • two vapor deposition systems may be provided behind (downstream) the device for classifying and separating the wooden beaches.
  • one steaming system is used for steam treatment of the wooden strands that are provided for the middle layer
  • the other steaming system is used for steam treatment of the wooden strands that are provided for the cover layers. This enables an optional steam treatment of the wooden strands for the middle layer or the wooden strands for the top layers.
  • FIG. 1 shows a variant of a device 10 for steam treatment of wooden beaches.
  • the device comprises a (thermally insulated) tubular body 11 with a perforated conveyor belt 12 passing through the tubular body 11.
  • the present device 10 enables steam treatment of the strands before the strands are dried in the drum dryer. All or part of the beaches that are intended for the later production of the OSB can be treated. The treatment takes place at normal pressure and achieves the homogeneous treatment of the beaches with steam by using the conveyor belt 12 made of metal mesh.
  • the belt of the transport device is dimensioned so that the strands cannot fall through the gaps.
  • the strands are transferred to the conveyor belt 12, which runs through the tubular body 11, directly after production.
  • the strands are distributed on the conveyor belt 12 in such a way that a homogeneous flow of water vapor through the strands is possible. Separation stations positioned at regular intervals ensure that existing or forming beach heaps are dissolved.
  • heating of the conveyor belt must be provided before the beaches are sprinkled on. This accelerates the heating of the beaches and thus reduces the duration of the steam treatment.
  • the heating can be done by resistance heating or by radiation.
  • the steam is then applied from above to the strands through nozzles 14.
  • the steam has a temperature of approx. 100 ° C.
  • the insulation of the metal tube 11 ensures that the heat losses are as low as possible.
  • the condensate that forms is collected under the transport device 12, freed from suspended matter and returned to the system after a cleaning step to remove dissolved substances.
  • the dwell time of the beaches in the saturated steam atmosphere is 5 to 15 minutes.
  • the progress of beach heating is determined at regular intervals by thermal sensors.
  • the temperature of the beaches should be close to 90 ° C at the end of the treatment.
  • step 1 suitable wood starting material for the production of the wooden beaches is provided. All softwoods, hardwoods or mixtures thereof are suitable as wood raw material.
  • the debarking (step 2) and the cutting (step 3) of the wood starting material is carried out in suitable chippers, whereby the size of the wooden beaches can be controlled accordingly.
  • shredding and preparation of the wooden strands they may be subjected to a pre-drying process, with a humidity of 5-10% being set in relation to the initial moisture of the wooden strands (not shown).
  • the wooden strands are introduced into an evaporation system (step 4).
  • the steam treatment of the wooden beaches takes place in a temperature range between 80 ° and 120 ° C at a pressure between 0.5 bar and 2 bar.
  • the resulting condensate can be collected and the substances washed out of the wooden beaches (terpenes, aldehydes) can be used from the condensate for further use.
  • step 9 After completion of the steam treatment, which in this case takes about 10-20 minutes, the steam-treated wooden beaches are dried (step 9), viewed and separated (step 5).
  • step 6a There is a separation in wooden strands for use as a middle layer (step 6a) or as a top layer (step 6b) with respective gluing.
  • the glued, steam-treated wooden strands are sprinkled onto a conveyor belt in the order of the first lower cover layer, middle layer and second upper cover layer (step 7) and then pressed into an OSB wood-based panel (step 8).
  • the wood raw material in analogy to Figure 1 First provided (step 1), debarked (step 2) and machined (step 3).
  • the wooden strands are optionally subjected to a pre-drying process, with a moisture of 5-10% being set in relation to the initial moisture of the wooden strands (step 3a).
  • a pre-drying process with a moisture of 5-10% being set in relation to the initial moisture of the wooden strands (step 3a).
  • a separation in wooden beaches for use as a middle layer or as a top layer step 5).
  • step 4a water vapor treatment of the wooden strands provided for the middle layer
  • step 4b water vapor treatment of the wooden strands provided for the cover layer (s)
  • the steam treatment of the wooden beaches takes place in a temperature range between 80 ° and 120 ° C at a pressure between 0.5 bar and 2 bar.
  • the resulting condensate can be collected and the substances washed out of the wooden beaches (terpenes, aldehydes) can be used from the condensate for further use.
  • steps 9a, 9b After completion of the water vapor treatment, which in the present case takes about 10-20 minutes, the water vapor-treated wooden strands are dried (steps 9a, 9b) and glued (steps 6 a, b).
  • the glued water-treated wooden strands are sprinkled onto a conveyor belt in the order of the first lower cover layer, middle layer and second upper cover layer (step 7) and then pressed into an OSB wood-based panel (step 8).
  • the OSB wood-based panel obtained is suitably assembled in each case.
  • Strands are produced from pine trunks (length: max. 200 mm, width: 20 mm, thickness: max. 1 mm, humidity max. 50%) and treated in a continuous process with steam at around 100 ° C.
  • the strands are loosely heaped up on a conveyor belt which has perforations and thus allows the steam to pass through after passing the strands.
  • the steam treatment was preferably carried out from top to bottom.
  • the conveyor belt is guided through a tubular body.
  • Nozzles are attached that distribute the steam evenly over the beaches.
  • the treatment with steam takes about 15 minutes.
  • the steam treatment takes place with the greatest possible exclusion of oxygen, so that one can speak of a reductive process control.
  • the tube body has a diameter of 50 cm and a length of 3 m in order to achieve a dwell time of about 15 minutes.
  • the conveyor belt was moved through the tubular body at a speed of about 2 m / 10 minutes. In the feed direction, the tube body was angled slightly upwards (2 to 10 degrees), so that the condensate that formed could easily be collected. This is a test facility with which the effect should be demonstrated. For a production plant, this can be enlarged and easily optimized by a specialist in terms of transport speed and quantity.
  • the strands are then dried in a conventional drum dryer.
  • the energy consumption of the drum dryer is significantly reduced, since the strands already have a temperature of around 90 ° C when they enter the dryer.
  • they are glued in a coil with adhesive, preferably with PMDI (approx. 3% by weight on dry wood).
  • the glued stands are spread in a conventional OSB system as top and middle layers.
  • the percentage distribution between the middle and top layers is preferably 70% to 30%.
  • the strands are pressed into sheets with a bulk density of around 570 kg / m3. After a storage period of one week, the test plate was tested for VOC release together with a standard plate of the same thickness in a micro-chamber.
  • Chamber parameters temperature: 23 ° C; Humidity: 0%; Air flow: 150 ml / min; Air change: 188 / h; Loading: 48.8 m 2 / m 3 ; Sample surface: 0.003 m 2 ; Chamber volume: 48 ml.
  • Table 1 parameter Test plate [ ⁇ g / m2 xh] Standard plate [ ⁇ g / m2 xh] Hexanal 194 1474 3-carene 208 626 ⁇ -pinene 181 925 Pentanal - 155 ⁇ -pinene - 285 2-octenal 60 115

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP19201042.9A 2017-04-25 2017-04-25 Panneau osb en matériaux dérivés du bois Active EP3620282B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19201042.9A EP3620282B1 (fr) 2017-04-25 2017-04-25 Panneau osb en matériaux dérivés du bois
PT192010429T PT3620282T (pt) 2017-04-25 2017-04-25 Painel à base de madeira osb
PL19201042T PL3620282T3 (pl) 2017-04-25 2017-04-25 Płyta drewnopochodna osb
ES19201042T ES2904805T3 (es) 2017-04-25 2017-04-25 Plancha de materia derivada de la madera OSB
HUE19201042A HUE057379T2 (hu) 2017-04-25 2017-04-25 OSB faalapú lap

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19201042.9A EP3620282B1 (fr) 2017-04-25 2017-04-25 Panneau osb en matériaux dérivés du bois
EP17167974.9A EP3395520B1 (fr) 2017-04-25 2017-04-25 Procédé de fabrication de panneaux de lamelles orientées osb à faible émission sur des composés organiques volatils (cov)

Related Parent Applications (1)

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EP19201042.9A Active EP3620282B1 (fr) 2017-04-25 2017-04-25 Panneau osb en matériaux dérivés du bois
EP18713575.1A Active EP3615288B1 (fr) 2017-04-25 2018-03-12 Procédé de fabrication de panneaux de lamelles orientées osb à faible émission sur des composés organiques volatils (cov)

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EP (3) EP3395520B1 (fr)
CN (2) CN112476694B (fr)
CA (1) CA3060986C (fr)
ES (3) ES2767090T3 (fr)
HU (3) HUE057379T2 (fr)
PL (3) PL3395520T3 (fr)
PT (2) PT3395520T (fr)
RU (1) RU2728871C1 (fr)
UA (1) UA127129C2 (fr)
WO (1) WO2018197094A1 (fr)

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HUE057379T2 (hu) * 2017-04-25 2022-05-28 SWISS KRONO Tec AG OSB faalapú lap
SE543059C2 (en) * 2019-03-07 2020-09-29 Stora Enso Oyj Device and method of processing logs using a thermal camera
LT3872256T (lt) 2020-02-28 2022-04-11 Fiberboard Gmbh Lakiųjų organinių junginių mažinimo medienos drožlėse būdas ir apdorojimo sistema

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CN110545971B (zh) 2020-11-03
CA3060986C (fr) 2023-08-15
US11904496B2 (en) 2024-02-20
PT3620282T (pt) 2022-01-13
ES2904805T3 (es) 2022-04-06
US11007668B2 (en) 2021-05-18
EP3395520A1 (fr) 2018-10-31
CN110545971A (zh) 2019-12-06
CN112476694A (zh) 2021-03-12
PL3615288T3 (pl) 2023-12-18
ES2767090T3 (es) 2020-06-16
US20210245391A1 (en) 2021-08-12
EP3620282B1 (fr) 2021-11-03
PL3620282T3 (pl) 2022-02-21
EP3615288C0 (fr) 2023-07-05
PL3395520T3 (pl) 2020-05-18
CN112476694B (zh) 2022-06-28
EP3395520B1 (fr) 2019-10-30
PT3395520T (pt) 2020-02-03
US20200108523A1 (en) 2020-04-09
EP3615288B1 (fr) 2023-07-05
EP3615288A1 (fr) 2020-03-04
HUE057379T2 (hu) 2022-05-28
WO2018197094A1 (fr) 2018-11-01
RU2728871C1 (ru) 2020-07-31
HUE048530T2 (hu) 2020-07-28
ES2958617T3 (es) 2024-02-12
UA127129C2 (uk) 2023-05-10
HUE063434T2 (hu) 2024-01-28
CA3060986A1 (fr) 2018-11-01

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