EP3112106B1 - Procédé de fabrication d'un produit en panneau à copeaux orientés, et produit en panneau à copeaux orientés. - Google Patents

Procédé de fabrication d'un produit en panneau à copeaux orientés, et produit en panneau à copeaux orientés. Download PDF

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EP3112106B1
EP3112106B1 EP15174631.0A EP15174631A EP3112106B1 EP 3112106 B1 EP3112106 B1 EP 3112106B1 EP 15174631 A EP15174631 A EP 15174631A EP 3112106 B1 EP3112106 B1 EP 3112106B1
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Prior art keywords
product
wood
osb
layer
fines
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EP15174631.0A
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German (de)
English (en)
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EP3112106A1 (fr
Inventor
David Murray
Guillaume COSTE
Michael NICHOL
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Smartply Europe Ltd
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Smartply Europe Ltd
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Priority to EP15174631.0A priority Critical patent/EP3112106B1/fr
Priority to PCT/EP2016/064962 priority patent/WO2017001380A1/fr
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    • 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
    • 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
    • B27N1/006—Pretreatment of moulding material for increasing resistance to swelling by humidity
    • 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
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B27N7/005—Coating boards, e.g. with a finishing or decorating layer
    • 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
    • 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
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • 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
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity

Definitions

  • the present invention relates to wood products and in particular to oriented strand board (OSB) having low air permeability, low oxygen gas transmission rate, and high water vapour resistance.
  • OSB oriented strand board
  • Air leakage through building components is a major issue for energy efficient structure design.
  • the air permeability of a material defines a material propensity to allow air to pass through it. Air permeability is a property of a material regardless of its dimensions. Air permeance of a material refers to the permeability of a material divided by it thickness. Reducing the overall air permeability of a structure i.e. preventing air loss from the inside of a structure to the outside of the structure, can have large benefits in terms of energy costs and overall energy use of the structure.
  • OSB oriented strand board
  • an oriented strand board, OSB, product for example a panel, as defined in claim 1.
  • the air permeability of the panel at 50 Pa may be between about 0.0007 and about 0.0015 m 3 /m 2 /h/Pa, for example from between about 0.0009 and about 0.0012 m 3 /m 2 /h/Pa.
  • the OSB product may have an air permeability of about 0.001 m 3 /m 2 /h/Pa.
  • the volume ratio of wood fines to wood flakes is from 3% to 15% higher, for example the volume ratio of wood fines to wood flakes may be from about 4% to 12% higher in the top layer and bottom layer compared to the core layer of the OSB product.
  • the volume ratio of wood fines to wood flakes may be from about 5% higher to about 10% higher in the top layer and bottom layer compared to the core layer of the OSB product.
  • the volume ratio of wood fines to wood flakes is from 28% to 35% in the top layer and bottom layer and wherein the volume ratio of wood fines to wood flakes is from 20% to 25% in the core layer.
  • the volume ratio of wood fines to wood flakes may be about 30% in the top layer and bottom layer and wherein the volume ratio of wood fines to wood flakes may be about 22% in the core layer.
  • too high a proportion of fines in a layer leads to decreased mechanical strength and increased distortion in the panel.
  • a product in which the top and bottom layers have a higher proportion of fines compared to the core layer provides a dual benefit of being mechanically resilient and also displaying reduced air permeability.
  • the OSB product comprises a water vapour resistant coating. This is advantageous as it provides for an OSB product which is water vapour resistant and obviates the need for additional air/vapour control (AVCL) sheets or membranes to be applied to the product to achieve vapour resistance.
  • AVCL air/vapour control
  • the vapour resistant coating thus provides an integrated vapour barrier to the product. This further prevents interstitial condensation within a timber frame structure incorporating the OSB product.
  • the water vapour resistant coating may comprise one or more cured UV curable layers. This is advantageous as the layers are easy to apply while curing ensures that the surface properties of the product are chemically altered to provide a consistent water vapour resistant surface. This presents an advantage over AVCL sheets which are merely applied to a wood surface and do not change any surface properties, and are easily punctured during construction. The coating is more robust and easier to apply than the application of AVCL membranes.
  • the UV curable coating provides an integrated vapour barrier with consistently high water vapour resistance over the entire surface of the product.
  • the dry cup water vapour diffusion factor, ⁇ , of the product may be from about 480 to about 640 for a product of 12.5 mm thickness.
  • the dry cup water vapour diffusion factor of the product may be from about 500 to about 620 for a product of 12.5 mm thickness, for example from between 520 and 600.
  • the dry cup water vapour diffusion factor of the product may be from about 540 to about 580 for a product of 12.5 mm thickness.
  • the dry cup water vapour diffusion factor of the product may be about 560 for a product of 12.5 mm thickness.
  • the wet cup water vapour diffusion factor of the product may be from about 160 to about 240 for a product of 12.5 mm thickness.
  • the wet cup water vapour diffusion factor of the product may be from about 170 to about 230 for a product of 12.5 mm thickness, for example from between 180 and 220.
  • the wet cup water vapour diffusion factor of the product may be from about 190 to about 210 for a product of 12.5 mm thickness.
  • the wet cup water vapour diffusion factor of the product may be about 200 for a product of 12.5 mm thickness.
  • the average density of the OSB product may be from about 580 kg/m 3 to about 660 kg/m 3 , for example the average density of the OSB product may be from about 600 kg/m 3 to about 640 kg/m 3 .
  • the average density of the OSB product may be about 620 kg/m 3 . This is advantageous as it provides for a structurally robust product.
  • the wood flakes in the core layer of the OSB product may be oriented at 90 degrees relative to the wood flakes in the top and bottom layers.
  • the top layer may have flakes oriented at 0 degrees from the major (x) axis.
  • the core layer may have flakes oriented at 90 degrees to the major (x) axis while the bottom layer may have flakes oriented at 0 degrees from the major (x) axis.
  • the core layer may have a top core and a bottom core. Having different relative orientation for flakes between the layers provide for enhanced structural strength in the OSB product. Providing a top core and a bottom core layer results in enhanced resistance to cupping or deformation of the product.
  • the OSB product may be oxygen gas diffusion tight in accordance with ASTM D 3985 and DIN 53 380 Part 3.
  • OSB boards perform as oxygen gas diffusion open which reduces the thermal performance of composite panels (i.e. panels formed from OSB panels facing one insulating layer) by up to 10%.
  • An oxygen gas diffusion tight OSB product provides enhanced thermal performance in composite panels made using the OSB product.
  • a process for forming an oriented strand board, OSB as defined in claim 10.
  • the process comprises applying a water vapour resistant coating to the product.
  • the process may comprise applying a water vapour resistant coating to the top or bottom layer.
  • the water vapour resistant coating may be one or more cured UV curable layers.
  • the UV curable coating provides an integrated water vapour barrier with consistently high water vapour resistance over the entire surface of the product.
  • FIG. 1 shows a schematic representation of an embodiment of the present invention.
  • OSB product in the form of the panel 1 comprises three layers, a top layer 2, a core layer 3 and a bottom layer 4. The layers are pressed together to form the OSB panel 1. It should be noted that the relative thickness of the layers in the figure are illustrative only and do not represent the actual relative thickness of the panel layers.
  • the structure as described above is typically fabricated via the process flow as shown in Figure 2 . In order to achieve reduced air permeability of panels which are fabricated via the process, the process is different from a typical OSB manufacturing process as set out below.
  • Wood logs suitable for fabrication of OSB are processed 201 to produce wood flakes and wood fines.
  • the flake geometry is monitored and controlled 202 to produce wood flakes and fines of the required dimensions.
  • Each of the layers of the OSB panel comprises a mixture of wood flakes and wood fines.
  • Wood flakes are wood elements with typical dimensions of flake length 100mm +/- 10mm, flake width, 40mm+/- 10mm and flake thickness 0.75mm+/- 0.1mm.
  • Wood fines are smaller wood elements with typical length, width and thickness dimensions of 0.1 mm - 3.3 mm.
  • the dimensions of the wood fines is less than about 5% of the longest wood flake dimension in the mixture.
  • the volume ratio of wood fines to wood flakes in the OSB panel differs between the panel layers. Desirably the volume ratio of wood fines to wood flakes in the OSB panel differs in the top layer and bottom layer compared to the core layer. Suitably the volume ratio of wood fines to wood flakes in the OSB panel is higher in the top layer and bottom layer compared to the core layer.
  • the top and bottom layer will have the same volume ratio of wood fines to wood flakes.
  • the core layer will have a different volume ratio of wood fines to wood flakes as compared to the top and bottom layer.
  • This ratio of flakes to fines as described can be controlled by addition of additional fines to the flakes/ fines mix of the wood material.
  • the density of the layers can be controlled also in this manner.
  • a greater ratio of fines is provided in the top and bottom layers when compared to the core layer. Increased fines addition in this manner increases the surface density of the top and bottom layer and reduces the movement of air through these surfaces.
  • maintaining a lower ratio of fines in the core layer provides the strength and structural integrity typically required of an OSB panel.
  • the volume ratio of wood fines to wood flakes in the OSB panel is from 28% to 35% in the top layer and bottom layer and the volume ratio of wood fines to wood flakes is from 20% to 25% in the core layer, for example the volume ratio of wood fines to wood flakes may be about 30% in the top layer and bottom layer and the volume ratio of wood fines to wood flakes may be about 22% in the core layer.
  • a number of further process parameters can have a bearing on the properties of the OSB material produced by the process. Control of these parameters can be relevant to the production of quality OSB with reduced air permeability properties. In particular, the following parameters are controlled during the board manufacturing process
  • the resin to wood ratio is controlled in the following manner with reference to Figure 2 and Figure 3 .
  • the wood product is dried 203 and the wood weight is measured using a calibrated scales conveyor.
  • the actual moisture content is measured using an inline moisture detection unit. This gives a 0% moisture calculation - an O.D (oven dry) weight of wood- which is then used to calculate a required resin content.
  • the rate of resin addition is controlled 204.
  • Required resin content is entered to a user interface or human machine interface (HMI) and this value is fed forward to a Proportional Integral Derivative (PID) control loop.
  • PID Proportional Integral Derivative
  • the OD wood weight is also fed forward to the PID control loop. This control instructs pumps to apply a calculated resin amount based on a measured solids content of the particular resin in use.
  • a number of resin types may be used for such a purpose, such as MDI (Methylene Diphenyl Diiocynate) including pMDI (Polymeric Methylene Diphenyl Diiocynate), and MUF (Melamine Urea Formaldehyde) and PF (Phenolic Formaldehyde).
  • MDI Methyl Diiocynate
  • pMDI Polymeric Methylene Diphenyl Diiocynate
  • MUF Melamine Urea Formaldehyde
  • PF Phhenolic Formaldehyde
  • the overall resin content in the formed OSB product fabricated in this manner is 4.0 - 5.5%.
  • This increased resin volume decreases the volume available in the OSB material for gas/air to permeate. This further results in a panel made from the OSB material being more durable than a typical OSB panel in moist conditions.
  • the resin may be further mixed with MPU (Micronized Polyurethane). Use of MPU further results in reduced volume in the surface (top and bottom layers) and core layers for gas/air to permeate. This is as a result of the increased surface area of MPU resin particles, compared to other resin types.
  • a typical MPU to resin mix comprises: Top layer: from about 1% up to about 35% MPU.
  • the top layer may comprise from about 10% up to about 30% MPU, for example the top layer may comprise about 25% MPU.
  • Core layer from about 1% up to about 25% MPU.
  • the core layer may comprise from about 5% up to about 20% MPU, for example the top layer may comprise about 15% MPU.
  • Bottom layer from about 1% up to about 35% MPU.
  • the bottom layer may comprise from about 10% up to about 30% MPU, for example the top layer may comprise about 25% MPU.
  • a moisture resistant release wax is further added at this point in the process.
  • the wood moisture content is controlled 205 in the following manner with reference to Figure 2 and Figure 4 :
  • OSB material with added resin is stored in "dry" bins.
  • Inline moisture meter determines moisture of the "dry” wood as it leaves the bin. A moisture content of 7% is typical. Wood weight is also measured at this stage.
  • a total moisture target is entered into HMI, e.g. a typical moisture content of 8 to 10% is required for quality OSB.
  • a control loop determines the net percentage of moisture required to be added to the "dry" wood (e.g. 1% to 3% based on the example moisture target above) and calculates the water volume required to be added 206 to achieve this percentage, as a function of the O.D wood flake weight measured. The control instructs the water pumps to apply calculated amount.
  • the density profile of the final board is controlled 207 in the following manner with reference to Figure 2 and Figure 5 :
  • a density set point for the desired OSB panel is entered into HMI as a weight. This is a predetermined calculation based on thickness and density.
  • This total figure is then split into the Bottom layer (BSL), Core Layer (CR) and Top layers (TSL).
  • BSL Bottom layer
  • CR Core Layer
  • TTL Top layers
  • the wood weight is measured for each layer and the weights of resin, wax and moisture are subtracted. This gives give the wood weight setpoint to be delivered on the production line. This is replicated at each of 4 forming stations.
  • the wood flakes are then oriented 208 on a mat before pressing.
  • the top layer will typically have flakes oriented at 0 degrees from the major (x) axis i.e. laid flat and parallel to the mat length.
  • the core layer will typically have flakes oriented at 90 degrees to the major (x) axis, i.e laid flat and perpendicular to the mat length, while the bottom layer will typically have flakes oriented at 0 degrees from the major (x) axis, i.e. laid flat and parallel to the mat length.
  • the core layer may be formed from a top core layer and a bottom core layer.
  • a typical pressing process is as follows: the bottom layer is laid in the major (x) direction first. Prior to pressing this layer is typically about 42.3 mm thick and is pressed to about 4.2 mm. The bottom core layer is laid next in the minor (y) direction. The bottom core is typically about 23 mm thick pre-pressing and about 2.4 mm post-pressing. The top core is laid next in the same direction as the bottom core. The top core layer thickness is typically about 32mm pre-pressing and about 3.2 mm post-pressing. The top layer is laid last in the major (x) direction.
  • the top layer thickness is typically about 42.3 mm pre-pressing and about 4.2 mm post-pressing. As such, based on the above dimensions, the thickness of a typical panel may comprise about 30% top layer thickness, about 23% top core layer thickness, about 17% bottom core layer thickness and about 30% bottom layer thickness.
  • the first pressing stage is 'closing'. Closing involves closing the press in a number of controlled compression stages. This stage contributes to the forming of the vertical density profile of the panel. This stage is followed by the 'hold' where the press is held closed for an extended duration. This stage heat cures the resin. Heat is conducted from the press through the wood initially from the surfaces but then the moisture content in the panel is converted to steam which allows more uniform heat transfer through panel. The final stage is the 'open'. Upon the completion of the hold stage there is a large amount of steam pressure in each panel. The open stage is a number of decompression stages which incrementally release internal steam pressure. This is done incrementally to prevent destructive pressure release. Typical panel properties are shown in Table 1 below.
  • the panels 1 have a layer 5 (See Figure 1 ) comprising a water vapour resistant barrier applied to them in order to enhance the water vapour resistant properties of the panel.
  • Figure 6 shows a flow diagram of the process of water vapour resistant barrier application to the OSB.
  • An uncoated OSB panel 1 is sanded to remove any excess agents that would prevent coating adhesion to wood strands.
  • a base coating is applied to the panel by rollers in two separate layers.
  • a first base coating is applied 601 to the panel and is then cured 602 by UV light.
  • a second coating is applied 603 and is then cured 604 by UV light.
  • a third, top coating is applied 605.
  • the top coating may be applied to the panel by any suitable means/ applicator including rollers.
  • the top coat is then cured 606 with UV light.
  • the coatings may be applied to the top or bottom layer of the panel.
  • a coating layer of UV curable material was found to be particularly advantageous.
  • the material comprises inorganic pigments and extenders and further comprise
  • a smooth finish is applied to the coating. This provides for good adhesion for airtight adhesive tape to seal the expansion gaps between adjacent panels when installed in a structure.
  • Air permeability was tested in accordance with EN 12114:2000 Thermal Performance of Buildings - Air Permeability of Building Components and Building Elements. Air permeability values in the range 0.0005 m 3 /m 2 /h/Pa - 0.0018 m 3 /m 2 /h/Pa at 50 Pa were achieved. A value of 0.0018 m 3 /m 2 /Pa is considered particularly advantageous for standardised low energy building construction, for example for Passive House type constructions.
  • Water vapour resistance was tested in accordance with EN ISO 12572:2001 Hygrothermal Performance of Building Materials and Products - determination of Water Vapour Transmission Properties. It is necessary to conduct both wet cup and dry cup tests in accordance with EN ISO 12572:2001.
  • the wet cup test measures the resistance of the passage of water vapour from an aqueous solution in a test cup, through an OSB sample (which is sealed to the cup), and into the surrounding atmosphere of the test chamber which is at a lower relative humidity level - vapour pressure is created due to the difference in humidity levels between the cup and the chamber atmosphere, which causes the vapour to pass through the OSB.
  • the test cup assembly with sample is weighed periodically until its weight loss ends when all of the aqueous solution has passed through the OSB.
  • the dry cup test measures water vapour transmission rate in the opposite direction, i.e. water vapour passes from a high humidity environment, through the OSB, and into a desiccant (silica gel). This time the test cup assembly is weighed periodically until its weight gain ends when all of the water vapour in the atmosphere has passed through the OSB and is absorbed by the desiccant. Applying a barrier to the panel in the manner described above results in an improvement of the vapour resistance property of the OSB panel. Dry Cup Water Vapour resistance values of 560+/- 80 were achieved for OSB panels with a thickness of 12.5 mm. Wet Cup Water Vapour resistance values of 200 +/- 40 were achieved for OSB panels with a thickness of 12.5 mm.
  • the OSB panels as described herein can be classified as oxygen gas diffusion tight.
  • the diffusion tight property of a panel is shown if the oxygen transmission rate is less than 4.5 ml per 24h per m 2 when measured at 23 +/- 3 °C in accordance with ASTM D 3985. It is demonstrated by taking ten facing specimens to be tested with no single result exceeding the limit value of 4.5ml per 24 h per m 2 .
  • the specimens are placed in the test apparatus at 23 +/- 3°C and 50 +/- 10% relative humidity with the side on which insulation foam is to be applied to the panel (for example in a wall construction) facing towards a nitrogen chamber and with the edges of the panel unsealed against lateral air infiltration.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Laminated Bodies (AREA)

Claims (11)

  1. Un panneau à copeaux orientés, OSB, tel qu'un panneau multicouche, formé d'une pluralité de couches pressées ensemble pour former le produit, ladite pluralité de couches comprenant une couche supérieure, une couche médiane et une couche inférieure, chaque couche comprenant un mélange de fragments de bois et de fines de bois, dans lequel panneau le rapport volumique fines de bois/fragments de bois est de 28% à 35% dans la couche supérieure et la couche inférieure et dans lequel le rapport volumique fines de bois/fragments de bois est de 20% à 25% dans la couche médiane et dans lequel le produit comprend en outre un revêtement résistant à la vapeur d'eau, tel que la perméabilité à l'air du produit formé est de 50 Pa, testé selon la norme EN 12114 : entre environ 0,0005 et environ 0,0018 m3/m2/h/Pa.2000 sous 50 Pa est comprise entre 0,0005 et 0,0018 m3/m2/h.Pa et dans lequel les dimensions des fines de bois sont inférieures à environ 5% de la plus longue dimension des fragments dans le mélange.
  2. Le produit OSB selon la revendication 1, dans lequel la perméabilité à l'air du produit est de 0,001 m3/m2/h/Pa.
  3. Le produit consistant en le panneau à copeaux orientés selon la revendication 1 ou 2, dans lequel le rapport volumique fines de bois/fragments de bois est de 30% dans la couche supérieure et la couche inférieure et dans lequel le rapport volumique fines de bois/fragments de bois dans la couche médiane est de 20%.
  4. Le produit OSB selon la revendication 1, dans lequel le revêtement résistant à la vapeur d'eau comprend une ou plusieurs couches polymérisables par les UV et durcies.
  5. Le produit OSB selon une quelconque des revendications 1 à 4, dans lequel le facteur de diffusion de vapeur d'eau du produit est de 480 à 640 pour un produit de 12,5 mm d'épaisseur, testé selon le procédé dit à coupelle sèche de la norme EN ISO 12572.2001.
  6. Le produit OSB selon l'une quelconque des revendications 1 à 4, dans lequel le facteur de diffusion de la vapeur d'eau est de 160 à 240 pour un produit de 12,5 mm d'épaisseur testé selon le procédé dit à coupelle humide de la norme EN ISO 12572.2001.
  7. Le produit OSB selon l'une quelconque des revendications précédentes, dans lequel la densité moyenne du produit est de 620 kg/m3.
  8. Le produit OSB selon l'une quelconque des revendications précédentes, dans lequel le produit résiste à la diffusion de gaz oxygène conformément aux normes ASTM D 3985 et DIN 53 380 Partie 3.
  9. Le produit OSB selon l'une quelconque des revendications précédentes, dans lequel les fragments de bois dans la couche médiane sont orientés à 90° par rapport aux fragments de bois dans les couches supérieure et inférieure.
  10. Un procédé de fabrication d'un panneau à copeaux orientés, OSB, selon l'une quelconque des revendications précédentes, comprenant:
    - le pressage d'une pluralité de couches pressées ensemble pour former le produit, ladite pluralité de couches comprenant une couche supérieure, une couche médiane et une couche inférieure, chaque couche comprenant un mélange de fragments de bois et de fines de bois, dans lesquelles le rapport volumique fines de bois/fragments de bois est de 28% à 35% dans la couche supérieure et la couche inférieure et dans lequel le rapport volumique fines de bois/fragments de bois est de 20% à 25% dans la couche médiane,
    - l'application d'un revêtement résistant à la vapeur d'eau sur la couche supérieure et sur la couche inférieure de façon que la perméabilité à l'air du produit testé par la norme EN 12114:2000 sous 50 Pa soit comprise entre 0,0005 et 0,0018 m3/m2/h/Pa.
  11. Le procédé selon la revendication 10, dans lequel le revêtement résistant à la vapeur d'eau comprend une ou plusieurs couches polymérisables par rayonnement ultraviolet et durcies.
EP15174631.0A 2015-06-30 2015-06-30 Procédé de fabrication d'un produit en panneau à copeaux orientés, et produit en panneau à copeaux orientés. Active EP3112106B1 (fr)

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EP15174631.0A EP3112106B1 (fr) 2015-06-30 2015-06-30 Procédé de fabrication d'un produit en panneau à copeaux orientés, et produit en panneau à copeaux orientés.
PCT/EP2016/064962 WO2017001380A1 (fr) 2015-06-30 2016-06-28 Produit formant panneau de grandes particules orientées

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EP15174631.0A EP3112106B1 (fr) 2015-06-30 2015-06-30 Procédé de fabrication d'un produit en panneau à copeaux orientés, et produit en panneau à copeaux orientés.

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EP3112106B1 true EP3112106B1 (fr) 2018-11-28

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