EP3181315B1 - Method for producing an osb with a smooth surface - Google Patents

Method for producing an osb with a smooth surface 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
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Prior art keywords
mixture
scattered
layer
osb
wood
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EP15003585.5A
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German (de)
French (fr)
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EP3181315A1 (en
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 EP15003585.5A priority Critical patent/EP3181315B1/en
Priority to PL15003585T priority patent/PL3181315T3/en
Priority to HUE15003585A priority patent/HUE050762T2/en
Priority to PT150035855T priority patent/PT3181315T/en
Priority to ES15003585T priority patent/ES2806753T3/en
Publication of EP3181315A1 publication Critical patent/EP3181315A1/en
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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
    • 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.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer OSB bei dem lange, mit einem Klebstoff beleimte Holzspäne (Strands) in mindestens drei Schichten orientiert gestreut werden, wobei die Ausrichtung der Holzspäne in angrenzenden Schichten versetzt erfolgt und anschließend die gestreuten Schichten unter hohem Druck und Temperatur zu einer Platte gewünschte Dicke verpresst werden, wobei der Klebstoff aushärtet.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.

Eine solche Platte ist beispielsweise aus der EP 1 136 636 A1 bekannt. Eine OSB zeichnet sich dadurch aus, dass sie von Lage zu Lage sich kreuzende, abwechselnd in Längsrichtung so wie in Querrichtung des Grundrisses verlaufende Strands aufweist. Die Strands weisen eine Länge von 70 bis 200 mm, eine Breite von 6 bis 30 mm und eine Dicke von 0,3 bis 1,2 mm auf. Als Material wird Nadelholz oder Laubholz verwendet, wobei der Holzanteil in der fertigen Platte zwischen 90 % und 98 % liegt. Die Orientierung der Späne in den einzelnen Schichten wird durch hintereinander angeordnete Streuaggregate realisiert.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.

Die bekannte OSB (Oriented Strand Board) wird als Schalungsplatte verwendet. Um eine glatte Oberfläche zu erzielen, werden auf die letzte StrandSchicht Fasern oder Späne aufgestreut, die die Unebenheiten der Oberfläche des Kerns ausgleichen sollen, um eine möglichst plane Oberfläche zu erzielen. Diese Feindeckschicht besteht aus einem Holz-Feinstmaterial, das nach einer Siebmaschenweite, die kleiner als 0,5 mm ist, erhalten wurde. Auf die Feinspäneschicht wird eine Papierschicht aufgelegt und in einer Kurztaktpresse werden alle Schichten miteinander verpresst, wobei unter Druck und Hitze ein Fließen des Kernes erreicht wird und somit eine Klebung zwischen dem Phenolpapier und dem Kern erfolgt.The well-known OSB (Oriented Strand Board) is used as formwork panel. In order to achieve a smooth surface, 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.

Dadurch, dass die Streurichtung der Strands von einer Lage zur nächsten um 90° gedreht ist, resultiert eine hohe Biegefestigkeit von OSB, was OSB für viele Anwendungen im Baubereich interessant macht. Ein weiterer Vorteil ist, dass eine OSB, besonders bei der Verwendung von Nadelhölzern, im Vergleich zu anderen Holzwerkstoffen eine niedrigere Rohdichte besitzt. Dies macht OSB auch für Anwendungen im Fahrzeugbau zum Produkt der Wahl. Zudem kann OSB in Längen und Breiten produziert werden, die zum Beispiel den Aufwand zur Konfektionierung bei der Herstellung einer LKW-Ladefläche minimiert.The fact that the direction of the strands is rotated by 90 ° from one layer to the next results in a high bending strength of OSB, which makes OSB interesting for many applications in the construction sector. 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. In addition, OSB can be produced in lengths and widths, which, for example, minimizes the effort required for assembly when manufacturing a truck loading area.

Bedingt durch die Geometrie der Strands und deren Streuung ergibt sich an der fertigen OSB keine glatte oder gar geschlossene Oberfläche, sondern die OSB weist eine Oberflächenstruktur mit vielen Vertiefungen, teilweise bis zu etwa 4 mm, auf. Diese Oberflächenstruktur verhindert eine Beschichtung von OSB mit bei anderen Holzwerkstoffen üblicherweise verwendeten Technologien, wie beispielsweise das Auflaminieren von mit Harnstoff-/ und/oder Melaminharz imprägnierten Papieren, Aufkaschieren von Finishfolien usw. Damit sind OSB viele Anwendungen verschlossen, die wirtschaftlich interessant wären. Denkbar sind hier Anwendungen für Betonschalungen, Fußböden, Fahrzeugböden und Seitenverkleidungen von Ladeflächen von LKW und Transportfahrzeugen.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.

Die einfachste Methode, eine glatte Oberfläche bei einer OSB zu erzeugen wäre das Schleifen, was aber zu Materialverlusten von mehr als 10 % führt. Nicht nur unter Kosten-, sondern auch unter ökologischen Aspekten ist das aber nicht sinnvoll.The easiest way to create a smooth surface on an OSB would be grinding, but this leads to material losses of more than 10%. This does not make sense not only from a cost perspective, but also from an ecological perspective.

Eine andere Möglichkeit, eine glatte Oberfläche zu erzeugen, besteht darin, in eine OSB-Fertigungslinie zusätzliche Streueinrichtungen für feine Späne einzubauen. Dies zieht jedoch eine umfangreiche Investition für die Spanherstellung, Spanaufbereitung und Spanbeleimung nach sich. In bestehenden Fertigungsbetrieben ist in vielen OSB-Linien kein Platz für derartige Installationen, sodass diese Möglichkeit für die meisten Hersteller ausscheidet. Auch bei Neuanlagen ist unklar, wieviel Prozent der gesamten Produktion mit einer derart optimierten Deckschicht versehen werden soll, sodass in einer dahingehenden Investition ein erhebliches Risiko gesehen werden muss.Another way to create a smooth surface is to install additional spreading devices for fine chips in an OSB production line. However, this entails an extensive investment in chip production, chip preparation and chip gluing. In existing manufacturing plants, there is no space for such installations in many OSB lines, so this option is ruled out for most manufacturers. Even with new plants, it is unclear what percentage of the entire production should be provided with such an optimized top layer, so that a considerable investment must be seen as a risk.

In der US 4,364,984 A wird eine OSB mit einem fünfschichtigen Aufbau offenbart, wobei die untere und obere Deckschicht gegenüber den Strands des Kernes wesentlich feinere Späne aufweist.In the US 4,364,984 A discloses an OSB with a five-layer structure, the lower and upper cover layers having significantly finer chips than the core strands.

Die DE 25 13 764 A1 offenbart ein Verfahren zur Herstellung einer Holzwerkstoffplatte, bei dem eine Mischung aus Klebstoff, Kunststoff und Holzmehl als Pulver auf die zu beschichtenden Seiten der Holzwerkstoffplatte aufgebracht und dann mit der Holzwerkstoffplatte verpresst wird. Eine solche Platte kann anschließend mit einem Dekorpapier, einer PVC-Folie oder einem Furnier beschichtet werden, um als Möbelplatte Verwendung zu finden.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.

Eine andere Möglichkeit der Glättung der Oberseite ist das Füllen der Löcher mit Hilfe eines Lackes. Dies erfordert eine Lackierlinie mit mehreren Auftragswerken. Da auch die Auftragsmengen bei einigen 100 g/m2 liegen müssen, ist dieses Verfahren sehr kostenintensiv. Außerdem ist eine anschließende Beschichtung mit Melaminharz imprägnierten Papieren auf einer Kurztaktpresse nicht ohne weiteres möglich, da es regelmäßig zwischen der lackierten OSB-Oberfläche und Melamin zu Haftungsproblemen kommt. Auch die Ausrüstung des Lackes mit geeigneten Füllstoffen, wie beispielsweise Holzmehl usw. löst dieses Problem offensichtlich nicht. Darüber hinaus kann es zu Störungen bei Aushärtung des Lackes kommen, jedenfalls dann, wenn die Fehlstellen in der Oberfläche der OSB besonders tief sind.Another way of smoothing the top is to fill the holes with a varnish. This requires a painting line with several application units. Since the application quantities must also be around 100 g / m 2 , this process is very cost-intensive. In addition, subsequent coating with papers impregnated with melamine resin on a short-cycle press is not readily possible, since adhesion problems regularly arise between the coated OSB surface and melamine. Equipping the paint with suitable fillers, such as wood flour, etc., obviously does not solve this problem. In addition, there may be problems with the hardening of the paint, at least when the imperfections in the surface of the OSB are particularly deep.

Die EP 1 749 587 A1 offenbart eine Bauplatte aus Holzwerkstoff und ein Verfahren zu ihrer Herstellung, bei dem eine OSB-Platte aus mindestens drei Lagen verpresster, harzbeleimter Späne hergestellt wird. Auf diese verpresste Späne wird eine Beschichtung aus einem wasserbasierten Lack aufgetragen, der anschließend getrocknet wird und so eine ebene Oberfläche erreicht werden kann. Dem wasserbasierten Lack kann Holzmehl zugegeben werden.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.

Ein weiterer Lösungsansatz ist die Verwendung von relativ dicken phenolharzimprägnierten Natronkraftpapieren, die oft auf ein Endgewicht von mehr als 400 g/m2 kommen. Diese werden in einer Kurztaktpresse auf die Oberfläche aufgepresst. Damit werden zwar die vorhandenen Löcher optisch überdeckt, jedoch bleibt die Eindruckfestigkeit in den Bereichen, in denen sich unter Beschichtung eine typische Fehlstelle in der Oberfläche der OSB befindet, niedrig. Damit besteht ein sehr hohes Risiko, dass wenn eine derartig beschichtete OSB beispielsweise als Ladefläche in einem LKW eingesetzt wird, durch punktförmige Belastungen Beschädigungen entstehen. In diese Beschädigungen kann später Wasser eindringen und zu Quellungen der Platte führen, die großflächige Materialzerstörungen nach sich zieht. Im Vergleich zu üblicherweise dafür verwendete Materialien (Sperrholz) ergäbe sich dann ein kürzerer Zyklus zum Austausch der Ladefläche, was die Kosten für den Nutzer erhöht. Innerhalb der bereits beschriebenen Inhomogenität unterhalb der Beschichtung lässt sich häufig eine Wolkigkeit, die aus hellen und dunklen Bereichen resultiert und eine leichte Welligkeit beobachten. Daraus resultiert keine hochwertige Anmutung des Produktes.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. Compared to the materials usually used for this (plywood), this would result in a shorter cycle for replacing the loading area, which increases the costs for the user. Within the inhomogeneity already described below the coating, a cloudiness that results from light and dark areas and a slight ripple can often be observed. This does not result in a high-quality appearance of the product.

In der EP 2 027 979 A1 wird ein anderes Problem der Beschichtung von Holzwerkstoffplatten angesprochen. Aus Umweltschutzgründen soll eine Holzwerkstoffplatte pulverbeschichtet werden. Zur Pulverbeschichtung wird ein elektrostatisch aufgeladenes Lackpulver unter Anwendung eines elektrischen Feldes gleichmäßig auf der zu lackierenden Oberfläche verteilt, anschließend auf dieser Oberfläche aufgeschmolzen und zu einer homogenen, fest an der Oberfläche haftenden Lackschicht verbunden. Um die Pulverbeschichtung vornehmen zu können, muss die Platte entsprechend leitfähig sein, damit das elektrische Feld angelegt werden kann. Hierzu wird vorgeschlagen, leitfähige Salze bei der Herstellung von Phenol-Klebstoff gebundene Platten anzuwenden.In the EP 2 027 979 A1 Another problem of coating wood-based panels is addressed. For environmental reasons, a wood-based panel should be powder-coated. For powder coating, an electrostatically charged paint powder is evenly distributed on the surface to be painted using an electric field, then melted onto this surface and bonded to form a homogeneous paint layer that adheres firmly to the surface. To make the powder coating too the plate must be correspondingly conductive so that the electrical field can be applied. For this purpose, it is proposed to use conductive salts in the manufacture of phenolic adhesive-bound plates.

Hiervon ausgehend liegt der Erfindung die Aufgabe zu Grunde, ein alternatives Verfahren zur Herstellung einer OSB mit einer glatten Oberfläche zu schaffen, die mit einer Beschichtung versehen werden kann.Proceeding from this, 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.

Zur Problemlösung zeichnet sich das gattungsgemäße Verfahren durch folgende Schritte aus:

  • Aufstreuen eines Gemisches aus Holzmehl und einem Kunstharzpulver auf eine Oberseite (5) der oberen Deckschicht (3),
  • Abstreifen oder Abrütteln des aufgestreuten Gemisches, sodass Unebenheiten bis zu einer Tiefe von 4 mm verfüllt werden,
  • Aushärten des Gemisches (4) unter Druck- und Temperatureinfluss indem das Gemisch (4) in die Vertiefungen in der oberen Deckschicht (3) hineingepresst wird, wobei das Kunstharz aufschmilzt und eine gleichmäßige Oberflächenschicht ausbildet,
wobei das Kunstharz Melamin- oder Phenolharz ist und das Gemisch in einer Menge von mindestens 80 g/m2 aufgestreut wird.To solve the problem, the generic method is characterized by the following steps:
  • Sprinkling a mixture of wood flour and a synthetic resin powder on an upper side (5) of the upper cover layer (3),
  • Scraping or shaking off the sprinkled mixture so that unevenness is filled to a depth of 4 mm,
  • Hardening of the mixture (4) under the influence of pressure and temperature by pressing the mixture (4) into the depressions in the upper cover layer (3), whereby the synthetic resin melts and a uniform surface layer trains,
wherein the synthetic resin is melamine or phenolic resin and the mixture is sprinkled in an amount of at least 80 g / m 2 .

Durch das aktive Einrakeln/Einrütteln des Gemischs in die Vertiefungen wird später eine erstklassige Oberfläche erhalten, die gut zu beschichten ist. Beispielsweise kann ein Papier oder eine Folie aufgebracht werden. Die so veredelte OSB kann bevorzugt als Betonschalungsplatte oder als Ladefläche eines LKW eingesetzt werden. Das Gemisch kann auf eine Oberseite einer bereits verpressten OSB aufgestreut werden oder auf die letzte gestreute Schicht langer Späne, eines aus mindestens drei gestreuten Schichten langer Späne bestehenden Spänekuchens aufgestreut werden.By actively scraping / shaking the mixture into the wells, a first-class surface is obtained that is easy to coat. For example, 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.

Das Gemisch wird vorzugsweise mit einem Flächengewicht von mindestens 100 g/m2 aufgestreut. Insbesondere vorzugsweise wird mit einem Flächengewicht von 200 g/m2 aufgestreut.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 .

Das Gemisch kann vorzugsweise aus 50 Gew% Holzmehl und 50 Gew% Kunstharzpulver bestehen.The mixture can preferably consist of 50% by weight wood flour and 50% by weight synthetic resin powder.

Die langen Holzspäne werden auf ein in einer Transportrichtung T umlaufendes Förderband gestreut. Wenn auch eine glatte Unterseite erzeugt werden soll, wird zunächst auf eine Papierlage ein Gemisch aus Holzmehl und Kunstharzpulver aufgestreut und darauf die erste Schicht langer Holzspäne aufgestreut. In diesem Fall erfolgt das Verpressen des Schichtaufbaus später bevorzugt in einer Kurztaktpresse, weil der technologische Aufbau einer Kurztaktpresse hierfür sehr aufwändig wäre.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.

Grundsätzlich denkbar wäre aber auch, den Schichtaufbau kontinuierlich zu verpressen.In principle, however, it would also be conceivable to continuously press the layer structure.

Auf die obere Gemischschicht kann bevorzugt ein phenolharzimprägniertes Natronkraftpapier aufgelegt werden, bevor der aus den aufeinander liegenden Schichten bestehende Schichtaufbau verpresst wird.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.

Vorteilhaft ist es, wenn das Gemisch mittels einer Rasterwalze aufgestreut wird. Es kann aber auch sehr einfach über einen oberhalb des Förderbandes angeordneten trichterförmigen Behälter aufgestreut werden. Frässtaub eignet sich gut für die Verwendung als Holzmehl in dem Gemisch. Damit werden gleichzeitig Recyclingaspekte berücksichtigt.It is advantageous if 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.

Um das Gemisch zu stabilisieren, können zur Armierung zusätzlich Holz- oder Cellulosefasern mit einem Anteil von 5 bis 20 Gew% hinzugegeben werden. Auch können dem Gemisch Netzmittel, Härter usw. als Hilfsstoffe zugegeben werden, die den Prozess positiv beeinflussen.To stabilize the mixture, 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.

Eine OSB bestehend aus mindestens drei Schichten von Strands zeichnet sich durch eine auf der Sichtseite der ersten und/oder letzten Schicht aufgebrachten Schicht aus einem Gemisch aus Holzmehl und Kunstharz aus und einer auf der Gemisch-Schicht aufgebrachten Beschichtung, insbesondere einer Papierlage, aus.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.

Auf die Schicht aus Holzmehl und Kunstharz kann eine diese abdeckende Papierlage aufkaschiert sein. Die Papierlage ist vorzugsweise ein phenolharzimprägniertes Natronkraftpapier. Das Kunstharz ist vorzugsweise Melamin- oder Phenolharz.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.

Mit Hilfe einer Zeichnung soll die Erfindung nachfolgend näher beschrieben werden. Es zeigen:

Figur 1 -
die schematische Darstellung einer OSB-Plattenherstellungsanlage;
Figur 2 -
die vergrößerte Darstellung gemäß Sichtpfeil II aus Figur 1;
The invention will be described in more detail below with the aid of a drawing. Show it:
Figure 1 -
the schematic representation of an OSB board manufacturing plant;
Figure 2 -
the enlarged view according to arrow II Figure 1 ;

Zunächst werden lange Holzspäne (Strands), die eine Länge von 150 bis 300 mm, vorzugsweise maximal 200 mm, eine Breite von 10 bis 2 mm und eine Dicke von weniger als 1 mm aufweisen, auf ein in einer Transportrichtung T umlaufendes - hier nicht dargestelltes - Transportband gestreut und zu einer unteren Deckschicht 1 gestreut. Auf diese Schicht 1 wird eine Mittelschicht 2 langer Späne gestreut, wobei die Späne in der Mittelschicht 2 gegenüber der unteren Deckschicht 1 um im Wesentlichen 90° versetzt sind. Das heißt, wenn die Späne in der unteren Deckschicht 1 in Längsrichtung (Transportrichtung T) orientiert sind, sind die Strands in der Mittelschicht 2 quer dazu orientiert, sie verlaufen also in Querrichtung. Auf die Mittelschicht 2 wird eine obere Deckschicht 3 langer Holzspäne aufgestreut, die dieselbe Ausrichtung wie die Strands in der unteren Deckschicht 1 haben. Die Holzspäne sind mit einem Klebstoff beleimt.First, long wood shavings (strands), 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.

Als Klebstoffe kommen Phenol-Formaldehydbindemittel (PF), Harnstoff-Formaldehydbindemittel (MF), Melamin-Harnstoff-Formaldehydbindemittel (MUF) oder Melamin-Harnstoff-Phenol-Formaldehydbindemittel (MUPF) in Betracht. Auch PDMI ist als Klebstoff geeignet. Innerhalb einer OSB können auch zwei verschiedene Bindemittel als Klebstoff eingesetzt werden. In der Mittelschicht können die Späne beispielsweise mit PDMI und in den Deckschichten mit MUF- bzw. MUPF-Bindemittel beleimt werden. Vorzugsweise wird PMDI als Klebstoff verwendet.Suitable adhesives are phenol-formaldehyde binders (PF), urea-formaldehyde binders (MF), melamine-urea-formaldehyde binders (MUF) or melamine-urea-phenol-formaldehyde binders (MUPF). PDMI is also suitable as an adhesive. Two different binders can also be used as adhesives within an OSB. In the middle layer, the chips can be glued with PDMI, for example, and in the outer layers with MUF or MUPF binders. PMDI is preferably used as an adhesive.

Auf die obere Deckschicht 3 wird eine Schicht 4 aus einem Gemisch 4 aus Holzmehl und einem Kunstharzpulver (Melaminharz oder Phenolharz) aufgestreut. Mittels einer Abstreifvorrichtung 6 wird die Gemisch-Schicht 4 abgestreift, sodass das Gemisch 4 aus Holzmehl und Kunstharzpulver aktiv in die in der Oberseite 5 der oberen Deckschicht 3 befindlichen Löcher gerieben wird. Der aus den Schichten 1, 2, 3, 4 bestehende Kuchen 8 wird in eine Doppelbandpresse 20 transportiert. Bei einer Presstemperatur von 260° C, einem Druck von bis zu 300 N/cm2 wird der Schichtaufbau zu einer OSB 10 gewünschter Dicke verpresst.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.

Wie Figur 2 zeigt füllt das verpresste Gemisch 4 in der Schicht 4 die Zwischenräume zwischen den Holzspänen in der oberen Deckschicht 3 aus. Durch die unterschiedlichen Dicken und Längen beziehungsweise Breiten der Strands bilden sich in den einzelnen Schichten 1, 2, 3 Hohlräume aus, die auf der Oberseite 5 der oberen Deckschicht 3 Vertiefungen von bis zu 4 mm hinterlassen, die auch noch Hinterschnitte aufweisen können, in die das Gemisch 4 aus Holzmehl und Kunstharzpulver der Schicht 3 hineingepresst wird, sodass sich die in Figur 2 gezeigte glatte Oberfläche 7 an der verpressten OSB 10 einstellt.How Figure 2 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.

Auf die glatte Oberfläche 7 der OSB 10 wird anschließend eine Beschichtung, vorzugsweise aus Papier oder Folie aufkaschiert. Das Papier kann auch auf die abgerakelte beziehungsweise abgerüttelte Schicht 4 aufgelegt werden, bevor der Spänekuchen 8 verpresst wird.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.

Ausführungsform 1Embodiment 1

Auf die Oberseite 5 einer OSB 10 (22 mm) wurde mit einer Streuvorrichtung ein Gemisch 4 aus Holzmehl und Melaminharzpulver (100 g/m2) im Verhältnis 1:1 aufgestreut. Zum Aufstreuen wird eine Maschine der Firma TPS eingesetzt, deren wesentliche Komponenten ein Vorratstrichter, eine darunter befindliche, rotierende Rasterwalze und eine Abstreifvorrichtung sind. Durch die Rotationsgeschwindigkeit der Rasterwalze wird dabei die Auftragsmenge pro Quadratmeter festgelegt. Hinter der Streumaschine befindet sich eine Vorrichtung mit der durch eine Abziehvorrichtung das aufgestreute Pulver in die Vertiefungen gerakelt wird. Auf die bestreute Oberfläche 7 wurde ein phenolharzimprägniertes Natronkraftpapier aufgelegt. Das Imprägnat besaß ein Endgewicht von ca. 450 g/m2. Der Aufbau wurde in einer Kurztaktpresse bei einer Presstemperatur von 200° C, einem Druck von 20 bar und einer Presszeit von 35 sec verpresst. Zum Vergleich wurde eine OSB 10 ohne aufgestreutes Pulver mit dem gleichen Phenolharzimprägnat verpresst. Beim visuellen Vergleich wurde an der Vergleichsplatte eine deutlich stärkere Welligkeit und Wolkigkeit beobachtet. Teilweise sind die unter der Beschichtung befindlichen Strands noch deutlich erkennbar beziehungsweise fühlbar. An den beiden Mustern wurde mit Hilfe eines Kugelfalltests die Eindruckfestigkeit geprüft. Dazu wurde eine Eisenkugel aus verschiedenen Höhen auf die Oberfläche 7 fallen gelassen. Pro Höhe wurden jeweils fünf Fallversuche durchgeführt. Der Test für die entsprechende Höhe gilt als bestanden, wenn bei keinem der fünf Versuche eine mechanische Beschädigung zu beobachten ist. Variante OSB mit Pulver und Imprägnat rhino TEG OS 400 OSB ohne Pulver mit Imprägnat rhino TEG OS 400 Fallhöhe Kugelfalltest 1500 mm 900 mm 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. For comparison, an OSB 10 without the sprinkled powder was pressed with the same phenolic resin impregnate. In the visual comparison, a significantly stronger ripple and cloudiness was observed on the comparison plate. In some cases, the beaches under the coating can still be clearly recognized or felt. The indentation strength of the two samples was tested using a ball drop test. For this purpose, 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. variant OSB with powder and impregnated rhino TEG OS 400 OSB without powder with impregnated rhino TEG OS 400 Fall height ball drop test 1500 mm 900 mm

Ausführungsform 2Embodiment 2

An einer OSB-Linie wird auf die oberste Strandschicht 3 eines Spänekuchens 8 mit Hilfe einer Streuvorrichtung ein Gemisch 4 aus Schleifstaub und Melaminharzpulver (200 g/m2) im Verhältnis 1:1 aufgestreut. Mit der erhöhten Menge wird dabei den noch lose auf dem Transportband liegenden Strands Rechnung getragen, die noch größere zu füllende Zwischenräume aufweisen. Zum Aufstreuen wird eine Maschine der Firma TPS eingesetzt, deren wesentliche Komponenten ein Vorratstrichter, eine darunter befindliche, rotierende Rasterwalze und eine Abstreifvorrichtung sind. Durch die Rotationsgeschwindigkeit der Rasterwalze wird dabei die Auftragsmenge pro Quadratmeter festgelegt. Auf die bestreute Oberfläche 7 wurde bei einem Muster phenolharzimprägniertes Natronkraftpapier aufgelegt. Das Imprägnat besaß ein Endgewicht von ca. 210 g/m2. Der Aufbau wurde in einer Kurztaktpresse bei einer Presstemperatur von 200° C, einem Druck von 20 bar und einer Presszeit von 35 sec verpresst.On an OSB line, 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.

Zum Vergleich wurde eine OSB 10 ohne aufgestreutes Pulver mit dem Phenolharzimprägnat aus der Ausführungsform 1 verpresst. An den beiden Mustern wurde mit Hilfe eines Kugelfalltests die Eindruckfestigkeit geprüft. Dazu wurde eine Eisenkugel aus verschiedenen Höhen auf die Oberfläche 7 fallen gelassen. Pro Höhe wurden jeweils fünf Fallversuche durchgeführt. Der Test für die entsprechende Höhe gilt als bestanden, wenn bei keinem der fünf Versuche eine mechanische Beschädigung zu beobachten ist.For comparison, 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. For this purpose, 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.

Hier zeigt sich, dass durch das aufgestreute Gemisch 4 aus Holzmehl und Melaminharzpulver, eine Verwendung von dünnerem phenolharzimprägniertem Natronpapier bei gleichen Eindruckfestigkeiten ermöglicht. Variante OSB mit Pulver 1x Imprägnat pro TEG 827 OSB ohne Pulver 1x Imprägnat Rhino TEG OS 400 Fallhöhe Kugelfalltest 900 mm 900 mm This shows that the sprinkled mixture 4 of wood flour and melamine resin powder enables the use of thinner phenolic resin-impregnated soda paper with the same indentation strength. variant OSB with powder 1x impregnate per TEG 827 OSB without powder 1x impregnated Rhino TEG OS 400 Fall height ball drop test 900 mm 900 mm

In dem Gemisch 4 aus Holzmehl oder Frässtaub können natürlich auch andere duroplastische Bindemittel oder Bindemittelgemische als Pulverharze eingesetzt werden (Phenol-Formaldehydharz, Melamin-Phenol-Formaldehydharz). Auch können zur Armierung Holz- oder Cellulosefasern zugesetzt werden (5 bis 20 Gew%). Den Pulverharzen können weitere Hilfsstoffe zugesetzt werden, die den Prozess positiv beeinflussen (Netzmittel, Härter usw.)In the mixture 4 of wood flour or milling dust it is of course also possible to use 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.

Der Spänekuchen kann 3- oder 5-lagig gestreut werden. Auch mehr als fünf Lagen beleimter Späne sind möglich.The chip cake can be sprinkled in 3 or 5 layers. More than five layers of glued chips are also possible.

BezugszeichenlisteReference symbol list

11
untere Deckschichtlower cover layer
22nd
MittelschichtMiddle class
33rd
obere Deckschichtupper cover layer
44th
Schicht/GemischLayer / mixture
55
OberseiteTop
66
AbstreifvorrichtungScraper
77
Oberflächesurface
88th
SpänekuchenChip cake
1010th
Platteplate
2020th
KurztaktpresseShort cycle press

Claims (17)

  1. Method for producing an OSB (10), in which long wood strands coated with an adhesive are scattered in an oriented manner in at least three layers (1, 2, 3), wherein the wood strands in adjoining layers (1, 2, 3) are aligned in an offset manner and then the scattered layers (1, 2, 3) are compressed under high pressure and temperature to form a board (10) of the desired thickness, as a result of which the adhesive melts and cures, comprising the following steps:
    - scattering a mixture (4) of wood flour and a synthetic resin powder onto an upper side (5) of the top cover layer (3),
    - stripping or shaking off the scattered-on mixture (4) so that unevennesses to a depth of 4 mm are filled,
    - curing the mixture (4) under the influence of pressure and temperature by pressing the mixture (4) into the depressions in the top cover layer (3), wherein the synthetic resin melts and a uniform surface layer forms,
    wherein the synthetic resin is melamine resin or phenolic resin and the mixture (4) is scattered on in an amount of at least 80 g/m2.
  2. Method according to Claim 1, characterized in that the mixture (4) is scattered onto an upper side (5) of an already pressed OSB (10).
  3. Method according to Claim 1, characterized in that the mixture is scattered onto the upper side (5) of the last scattered layer (3) of long wood strands of a strand cake (8) consisting of at least three scattered layers (1, 2, 3).
  4. Method according to one of the preceding claims, characterized in that the mixture (4) is scattered on with a weight per unit area of at least 100 g/m2.
  5. Method according to Claim 4, characterized in that the mixture (4) is scattered on with a weight per unit area of 200 g/m2.
  6. Method according to one of the preceding claims, characterized in that the mixture (4) consists of 50% by weight wood flour and 50% by weight synthetic resin powder.
  7. Method according to one of the preceding claims, characterized in that the mixture (4) is actively introduced into the depressions by a doctor blade.
  8. Method according to one of the preceding claims, characterized in that the long wood strands are scattered onto a conveyor belt circulating in a transporting direction.
  9. Method according to one of the preceding claims, characterized in that first a mixture (4) of wood flour and synthetic resin powder is scattered onto a paper layer and, after that, the first layer of long wood strands is scattered on.
  10. Method according to one of the preceding claims, characterized in that an impregnated soda kraft paper is placed onto the mixture layer before the layer structure is compressed.
  11. Method according to Claim 10, characterized in that the soda kraft paper is impregnated with phenolic resin.
  12. Method according to one of Claims 2 to 7, characterized in that the layer structure is compressed in a short-cycle press at a temperature of 200°C, a pressure of 20 bar and for a pressing time of 35 sec.
  13. Method according to one of the preceding claims, characterized in that the mixture (4) is scattered on by means of an anilox roll.
  14. Method according to one of the preceding claims, characterized in that milling dust is used as wood flour.
  15. Method according to one of the preceding claims, characterized in that wood fibres or cellulose fibres are additionally added to the mixture (4) for reinforcement.
  16. Method according to Claim 15, characterized in that the reinforcement comprises a proportion of 5 to 20% by weight.
  17. Method according to one of the preceding claims, characterized in that wetting agents and/or curing agents are added to the mixture (4).
EP15003585.5A 2015-12-16 2015-12-16 Method for producing an osb with a smooth surface Active EP3181315B1 (en)

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EP15003585.5A EP3181315B1 (en) 2015-12-16 2015-12-16 Method for producing an osb with a smooth surface
PL15003585T PL3181315T3 (en) 2015-12-16 2015-12-16 Method for producing an osb with a smooth surface
HUE15003585A HUE050762T2 (en) 2015-12-16 2015-12-16 Method for producing an osb with a smooth surface
PT150035855T PT3181315T (en) 2015-12-16 2015-12-16 Method for producing an osb with a smooth surface
ES15003585T ES2806753T3 (en) 2015-12-16 2015-12-16 Procedure for the manufacture of an OBS panel with a smooth surface

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Publication number Priority date Publication date Assignee Title
DE2513764C3 (en) 1975-03-27 1980-07-31 Bison-Werke Baehre & Greten Gmbh & Co Kg, 3257 Springe Method for producing a wood-based panel coated at least on one side, such as chipboard or the like
US4364984A (en) 1981-01-23 1982-12-21 Bison-Werke, Bahre & Greten Gmbh & Co., Kg Surfaced oriented strand board
AT392758B (en) * 1989-05-03 1991-06-10 Isovolta METHOD FOR PRODUCING A PLANT-SHAPED PLASTIC RESIN PRINTING MOLD, AND PRE-PRODUCT FOR USE IN SUCH A METHOD
TR200401512T4 (en) 2000-03-24 2004-08-23 Kronotec Ag Particle boards, especially molded wood
DE102005036579A1 (en) * 2005-08-01 2007-02-08 Kronotec Ag Building board of wood-based material and method of manufacture
DE102007039267B4 (en) * 2007-08-20 2013-04-04 Kronotec Ag Process for the production of conductive wood-based panels and such wood-based panels
IT1397156B1 (en) * 2009-07-15 2013-01-04 Renolit Gor Spa PANEL FOR THE CONSTRUCTION OF FURNISHING ELEMENTS AS DOORS, DOORS, TABLES, FURNITURE OR SIMILAR

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ES2806753T3 (en) 2021-02-18
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PL3181315T3 (en) 2020-11-16

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