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EP3181315B1 - Procede de fabrication d'un panneau osb presentant une surface lisse - Google Patents

Procede de fabrication d'un panneau osb presentant une surface lisse Download PDF

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Publication number
EP3181315B1
EP3181315B1 EP15003585.5A EP15003585A EP3181315B1 EP 3181315 B1 EP3181315 B1 EP 3181315B1 EP 15003585 A EP15003585 A EP 15003585A EP 3181315 B1 EP3181315 B1 EP 3181315B1
Authority
EP
European Patent Office
Prior art keywords
mixture
scattered
layer
osb
wood
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.)
Active
Application number
EP15003585.5A
Other languages
German (de)
English (en)
Other versions
EP3181315A1 (fr
Inventor
Norbert Kalwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swiss Krono Tec AG
Original Assignee
Swiss Krono Tec AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Swiss Krono Tec AG filed Critical Swiss Krono Tec AG
Priority to ES15003585T priority Critical patent/ES2806753T3/es
Priority to EP15003585.5A priority patent/EP3181315B1/fr
Priority to PT150035855T priority patent/PT3181315T/pt
Priority to PL15003585T priority patent/PL3181315T3/pl
Priority to HUE15003585A priority patent/HUE050762T2/hu
Publication of EP3181315A1 publication Critical patent/EP3181315A1/fr
Application granted granted Critical
Publication of EP3181315B1 publication Critical patent/EP3181315B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • 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
    • 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

Definitions

  • the invention relates to a method for producing an OSB in which long wood chips (strands) glued with an adhesive are scattered in at least three layers, the orientation of the wood chips being offset in adjacent layers and then the scattered layers under high pressure and temperature desired thickness can be pressed onto a plate, whereby the adhesive hardens.
  • Such a plate is for example from the EP 1 136 636 A1 known.
  • An OSB is characterized by the fact that it has intersecting beaches that run alternately in the longitudinal direction as well as in the transverse direction of the floor plan.
  • the strands are 70 to 200 mm long, 6 to 30 mm wide and 0.3 to 1.2 mm thick.
  • Softwood or hardwood is used as the material, with the proportion of wood in the finished board between 90% and 98%.
  • the chips are oriented in the individual layers using scattering units arranged one behind the other.
  • the well-known OSB Oriented Strand Board
  • OSB Oriented Strand Board
  • fibers or chips are sprinkled on the last beach layer, which should compensate for the unevenness of the surface of the core in order to achieve a surface that is as flat as possible.
  • This fine surface layer consists of a fine wood material, which after a Sieve mesh size, which is smaller than 0.5 mm, was obtained.
  • a layer of paper is placed on the fine chip layer and all layers are pressed together in a short-cycle press, whereby the core flows under pressure and heat and thus there is an adhesive bond between the phenolic paper and the core.
  • OSB is rotated by 90 ° from one layer to the next.
  • Another advantage is that an OSB, especially when using softwood, has a lower bulk density than other wood-based materials. This also makes OSB the product of choice for applications in vehicle construction.
  • OSB can be produced in lengths and widths, which, for example, minimizes the effort required for assembly when manufacturing a truck loading area.
  • OSB Due to the geometry of the beaches and their scattering, there is no smooth or even closed surface on the finished OSB, but the OSB has a surface structure with many depressions, sometimes up to about 4 mm. This surface structure prevents OSB from being coated with technologies commonly used in other wood-based materials, such as the lamination of paper impregnated with urea and / or melamine resin, the lamination of finish foils, etc. This closes many applications that would be economically interesting. Applications for concrete formwork, floors, vehicle floors and side panels of loading areas of trucks and transport vehicles are conceivable here.
  • the DE 25 13 764 A1 discloses a method for producing a wood-based panel, in which a mixture of adhesive, plastic and wood flour is applied as a powder to the sides of the wood-based panel to be coated and then pressed with the wood-based panel. Such a plate can then be coated with a decorative paper, a PVC film or a veneer in order to be used as a furniture plate.
  • the EP 1 749 587 A1 discloses a building board made of wood-based material and a method for its production, in which an OSB board is produced from at least three layers of compressed, resin-glued chips. A coating of a water-based varnish is applied to these pressed chips, which is then dried and a flat surface can be achieved. Wood flour can be added to the water-based varnish.
  • Another solution is the use of relatively thick phenolic resin-impregnated sodium kraft papers, which often have a final weight of more than 400 g / m 2 . These are pressed onto the surface in a short-cycle press. This does cover the existing holes optically, but the resistance to indentation remains low in the areas in which a typical flaw in the surface of the OSB is under coating. There is therefore a very high risk that if such an OSB is used, for example, as a loading area in a truck, punctiform loads will cause damage. Water can later penetrate into this damage and lead to swelling of the plate, which results in extensive material destruction.
  • the object of the invention is to create an alternative method for producing an OSB with a smooth surface which can be provided with a coating.
  • a first-class surface is obtained that is easy to coat.
  • paper or foil can be applied.
  • the OSB finished in this way can preferably be used as a concrete formwork panel or as a loading area for a truck.
  • the mixture can be sprinkled on top of an already pressed OSB or sprinkled on the last scattered layer of long chips, a chip cake consisting of at least three scattered layers of long chips.
  • the mixture is preferably sprinkled with a basis weight of at least 100 g / m 2 . It is particularly preferably sprinkled with a weight per unit area of 200 g / m 2 .
  • the mixture can preferably consist of 50% by weight wood flour and 50% by weight synthetic resin powder.
  • the long wood chips are scattered on a conveyor belt rotating in a transport direction T. If a smooth underside is also to be created, a mixture of wood flour and synthetic resin powder is first sprinkled on a paper layer and the first layer of long wood chips is sprinkled on it. In this case, the layer structure is later preferably pressed in a short-cycle press, because the technological structure of a short-cycle press would be very complex for this.
  • a phenolic resin-impregnated sodium kraft paper can preferably be placed on the upper mixture layer before the layer structure consisting of the layers lying on top of one another is pressed.
  • the mixture is sprinkled on using an anilox roller. However, it can also be sprinkled very simply over a funnel-shaped container arranged above the conveyor belt. Milling dust is well suited for use as wood flour in the mixture. This also takes recycling aspects into account.
  • wood or cellulose fibers with a proportion of 5 to 20% by weight can also be added to the reinforcement.
  • Wetting agents, hardeners etc. can also be added to the mixture as auxiliaries which have a positive effect on the process.
  • An OSB consisting of at least three layers of strands is characterized by a layer of a mixture of wood flour and synthetic resin applied to the visible side of the first and / or last layer and a coating, in particular a paper layer, applied to the mixture layer.
  • a paper layer covering this can be laminated onto the layer of wood flour and synthetic resin.
  • the paper layer is preferably a phenolic resin impregnated sodium kraft paper.
  • the synthetic resin is preferably melamine or phenolic resin.
  • long wood shavings which have a length of 150 to 300 mm, preferably a maximum of 200 mm, a width of 10 to 2 mm and a thickness of less than 1 mm, on a circumferential in a transport direction T - not shown here - Scattered conveyor belt and scattered to a lower cover layer 1.
  • a middle layer 2 of long chips is scattered onto this layer 1, the chips in the middle layer 2 being offset by essentially 90 ° with respect to the lower cover layer 1. This means that if the chips in the lower cover layer 1 are oriented in the longitudinal direction (transport direction T), the strands in the middle layer 2 are oriented transversely thereto, that is to say they run in the transverse direction.
  • An upper cover layer 3 of long wood chips is sprinkled on the middle layer 2, which have the same orientation as the strands in the lower cover layer 1. The wood chips are glued with an adhesive.
  • Suitable adhesives are phenol-formaldehyde binders (PF), urea-formaldehyde binders (MF), melamine-urea-formaldehyde binders (MUF) or melamine-urea-phenol-formaldehyde binders (MUPF).
  • PF phenol-formaldehyde binders
  • MF urea-formaldehyde binders
  • UMF melamine-urea-formaldehyde binders
  • MUPF melamine-urea-phenol-formaldehyde binders
  • MUPF melamine-urea-phenol-formaldehyde binders
  • a layer 4 made of a mixture 4 is made from the top cover layer 3 Wood flour and a synthetic resin powder (melamine resin or phenolic resin) sprinkled on.
  • the mixture layer 4 is stripped off by means of a stripping device 6, so that the mixture 4 of wood flour and synthetic resin powder is actively rubbed into the holes in the top 5 of the top cover layer 3.
  • the cake 8 consisting of layers 1, 2, 3, 4 is transported into a double belt press 20. At a pressing temperature of 260 ° C, a pressure of up to 300 N / cm 2 , the layer structure is pressed to an OSB 10 of the desired thickness.
  • FIG. 1 shows the compressed mixture 4 in the layer 4 fills the spaces between the wood chips in the upper cover layer 3. Due to the different thicknesses and lengths or widths of the strands, cavities form in the individual layers 1, 2, 3, which leave 3 depressions of up to 4 mm on the upper side 5 of the upper cover layer, which may also have undercuts into the mixture 4 of wood flour and synthetic resin powder of the layer 3 is pressed in, so that the in Figure 2 shown smooth surface 7 on the pressed OSB 10.
  • a coating preferably made of paper or film, is then laminated onto the smooth surface 7 of the OSB 10.
  • the paper can also be placed on the doctored or shaken off layer 4 before the chip cake 8 is pressed.
  • a mixture 4 of wood flour and melamine resin powder (100 g / m 2 ) in a ratio of 1: 1 was sprinkled onto the top 5 of an OSB 10 (22 mm) using a scattering device.
  • a machine from TPS is used for spreading, the essential components of which are a hopper, a rotating anilox roller underneath and a stripping device. The application rate per square meter is determined by the rotation speed of the anilox roller fixed.
  • Behind the spreader is a device with which the sprinkled powder is doctored into the recesses by a pulling device.
  • a phenolic resin-impregnated sodium kraft paper was placed on the sprinkled surface 7. The impregnate had a final weight of approx. 450 g / m 2 .
  • the structure was pressed in a short cycle press at a press temperature of 200 ° C, a pressure of 20 bar and a press time of 35 seconds.
  • an OSB 10 without the sprinkled powder was pressed with the same phenolic resin impregnate.
  • the indentation strength of the two samples was tested using a ball drop test.
  • an iron ball was dropped onto surface 7 from different heights. Five drop tests were carried out for each height. The test for the corresponding height is passed if no mechanical damage is observed in any of the five tests.
  • a mixture 4 of grinding dust and melamine resin powder (200 g / m 2 ) is sprinkled on the top beach layer 3 of a chip cake 8 with the aid of a scattering device in a ratio of 1: 1.
  • the increased quantity takes into account the beaches still lying loosely on the conveyor belt, which have even larger gaps to be filled.
  • a machine from TPS is used for spreading, the main components of which are a hopper and a rotating anilox roller underneath and are a scraper.
  • the application rate per square meter is determined by the rotation speed of the anilox roller.
  • Phenol resin-impregnated sodium kraft paper was placed on the sprinkled surface 7.
  • the impregnate had a final weight of approx. 210 g / m 2 .
  • the structure was pressed in a short cycle press at a press temperature of 200 ° C, a pressure of 20 bar and a press time of 35 seconds.
  • an OSB 10 without powder sprinkled on was pressed with the phenolic resin impregnate from embodiment 1.
  • the indentation strength of the two samples was tested using a ball drop test.
  • an iron ball was dropped onto surface 7 from different heights. Five drop tests were carried out for each height. The test for the corresponding height is passed if no mechanical damage is observed in any of the five tests.
  • thermosetting binders or binder mixtures other than powder resins (phenol-formaldehyde resin, melamine-phenol-formaldehyde resin). Wood or cellulose fibers can also be added for reinforcement (5 to 20% by weight). Additional auxiliaries that positively influence the process (wetting agents, hardeners etc.) can be added to the powder resins.
  • the chip cake can be sprinkled in 3 or 5 layers. More than five layers of glued chips are also possible.

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)

Claims (17)

  1. Procédé de fabrication d'un panneau OSB (10), dans lequel des copeaux de bois longs encollés d'une colle sont dispersés de façon orientée en au moins trois couches (1, 2, 3),
    dans lequel
    l'orientation des copeaux de bois dans des couches adjacentes (1, 2, 3) s'effectue avec un décalage et ensuite les couches dispersées (1, 2, 3) sont pressées à une pression et une température élevées pour donner un panneau (10) d'épaisseur désirée, ce qui fait que la colle fond et durcit,
    comprenant les étapes suivantes consistant à :
    - disperser un mélange (4) de farine de bois et d'une poudre en résine synthétique sur une face supérieure (5) de la couche de couverture supérieure (3),
    - racler ou secouer le mélange dispersé (4) de manière à remplir les irrégularités jusqu'à une profondeur de 4 mm,
    - faire durcir le mélange (4) sous l'influence de la pression et de la température en pressant le mélange (4) dans les cavités de la couche de couverture supérieure (3), ce qui fait fondre la résine synthétique et réalise une couche de surface régulière,
    dans lequel la résine synthétique est une résine de mélamine ou une résine phénolique et le mélange (4) est dispersé en une quantité d'au moins 80 g/m2
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    le mélange (4) est dispersé sur une face supérieure (5) d'un panneau OSB (10) déjà pressé.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    le mélange est dispersé sur la face supérieure (5) de la couche (3) dispersée en dernier de copeaux de bois longs à partir d'un gâteau de copeaux (8) constitué d'au moins trois couches dispersées (1, 2, 3).
  4. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le mélange (4) est dispersé avec un grammage d'au moins 100 g/m2.
  5. Procédé selon la revendication 4,
    caractérisé en ce que
    le mélange (4) est dispersé avec un grammage d'au moins 200 g/m2.
  6. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le mélange (4) est constitué à 50 % en poids de farine de bois et à 50 % en poids de poudre de résine synthétique.
  7. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le mélange (4) est intégré activement par raclage dans les cavités.
  8. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    les copeaux de bois longs sont dispersés sur une bande de transport circulant dans une direction de transport.
  9. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    un mélange (4) de farine de bois et de poudre de résine synthétique est dispersé tout d'abord sur une couche de papier sur laquelle est alors dispersée la première couche de copeaux de bois longs.
  10. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    un papier kraft à la soude imprégné est appliqué sur la couche de mélange avant que la structure de couches ne soit pressée.
  11. Procédé selon la revendication 10,
    caractérisé en ce que
    le papier kraft à soude est imprégné de résine phénolique.
  12. Procédé selon l'une des revendications 2 à 7,
    caractérisé en ce que
    la structure de couches est pressée dans une presse à cycle court à une température de 200 °C, une pression de 20 bar et une durée de pressage de 35 secondes.
  13. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le mélange (4) est dispersé au moyen d'un rouleau tramé.
  14. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    de la poussière de fraisage est utilisée comme farine de bois.
  15. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    des fibres de bois ou de cellulose sont ajoutées en supplément au mélange (4) pour le renforcer.
  16. Procédé selon la revendication 15,
    caractérisé en ce que
    le renforcement représente une part de 5 à 20 % en poids.
  17. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    un agent mouillant et/ou un durcisseur est/sont ajouté(s) au mélange (4).
EP15003585.5A 2015-12-16 2015-12-16 Procede de fabrication d'un panneau osb presentant une surface lisse Active EP3181315B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ES15003585T ES2806753T3 (es) 2015-12-16 2015-12-16 Procedimiento para la fabricación de un panel de OBS con superficie lisa
EP15003585.5A EP3181315B1 (fr) 2015-12-16 2015-12-16 Procede de fabrication d'un panneau osb presentant une surface lisse
PT150035855T PT3181315T (pt) 2015-12-16 2015-12-16 Processo de produção de uma osb com uma superfície lisa
PL15003585T PL3181315T3 (pl) 2015-12-16 2015-12-16 Sposób produkowania płyty osb z gładką powierzchnią
HUE15003585A HUE050762T2 (hu) 2015-12-16 2015-12-16 Eljárás egy sima felületû OSB lemez elõállítására

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15003585.5A EP3181315B1 (fr) 2015-12-16 2015-12-16 Procede de fabrication d'un panneau osb presentant une surface lisse

Publications (2)

Publication Number Publication Date
EP3181315A1 EP3181315A1 (fr) 2017-06-21
EP3181315B1 true EP3181315B1 (fr) 2020-06-10

Family

ID=54936751

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15003585.5A Active EP3181315B1 (fr) 2015-12-16 2015-12-16 Procede de fabrication d'un panneau osb presentant une surface lisse

Country Status (5)

Country Link
EP (1) EP3181315B1 (fr)
ES (1) ES2806753T3 (fr)
HU (1) HUE050762T2 (fr)
PL (1) PL3181315T3 (fr)
PT (1) PT3181315T (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2513764C3 (de) 1975-03-27 1980-07-31 Bison-Werke Baehre & Greten Gmbh & Co Kg, 3257 Springe Verfahren zum Herstellen einer mindestens einseitig beschichteten Holzwerkstoff-Platte, wie Spanplatte o.dgl
US4364984A (en) 1981-01-23 1982-12-21 Bison-Werke, Bahre & Greten Gmbh & Co., Kg Surfaced oriented strand board
AT392758B (de) * 1989-05-03 1991-06-10 Isovolta Verfahren zum herstellen eines gegebenenfalls plattenfoermigen kunstharz-druckformkoerpers sowie vorprodukt zum einsatz bei einem solchen verfahren
ATE268421T1 (de) 2000-03-24 2004-06-15 Kronotec Ag Holzpartikelplatte, insbesondere schalungsplatte
DE102005036579A1 (de) * 2005-08-01 2007-02-08 Kronotec Ag Bauplatte aus Holzwerkstoff und Verfahren zur Herstellung
DE102007039267B4 (de) * 2007-08-20 2013-04-04 Kronotec Ag Verfahren zur Herstellung von leitfähigen Holzwerkstoffplatten und solche Holzwerkstoffplatten
IT1397156B1 (it) * 2009-07-15 2013-01-04 Renolit Gor Spa Pannello per la realizzazione di elementi di arredo come porte, ante, tavoli, mobili o simili

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
HUE050762T2 (hu) 2021-01-28
EP3181315A1 (fr) 2017-06-21
ES2806753T3 (es) 2021-02-18
PL3181315T3 (pl) 2020-11-16
PT3181315T (pt) 2020-07-17

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