EP2251170A2 - Method and cycle press for producing a high density material board made of wooden materials or materials similar to wood, high density material board and use of the material board - Google Patents
Method and cycle press for producing a high density material board made of wooden materials or materials similar to wood, high density material board and use of the material board Download PDFInfo
- Publication number
- EP2251170A2 EP2251170A2 EP10005057A EP10005057A EP2251170A2 EP 2251170 A2 EP2251170 A2 EP 2251170A2 EP 10005057 A EP10005057 A EP 10005057A EP 10005057 A EP10005057 A EP 10005057A EP 2251170 A2 EP2251170 A2 EP 2251170A2
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- European Patent Office
- Prior art keywords
- chips
- density
- material plate
- mat
- press
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- 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.)
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Classifications
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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
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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
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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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
- B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat
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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
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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
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
- B27N3/183—Forming the mat-edges, e.g. by cutting
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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
- B27N3/20—Moulding or pressing characterised by using platen-presses
Definitions
- the invention relates to a method for producing a high-density material plate from wood or wood-like raw materials according to the preamble of claim 1. Further, the invention relates to a high-density material plate according to claim 20, to a use of the material plate according to claim 27 and on a cycle press according to claim 28th
- the temperature increases steadily in the middle of the mat of the pressed material.
- the surface begins to cool and, with some delay, the near-surface layers of the material also follow.
- the temperature continues to increase in the middle of the mat, as the amount of heat introduced despite cooling continues to penetrate towards the middle of the mat.
- the middle of the mat can increase significantly above 120 ° C according to this method in conjunction with the parameters specified therein.
- a cooling carried out with a heating plate temperature or surface temperature below 80 ° C in the continuous press after leaving the continuous press plates produced by this method burst because the temperature in the middle of the mat increases to over 120 ° C and thus the vapor pressure in the mat inside of the outlet from the continuous press becomes so high that the surfaces of the finished plate burst open.
- the adhesive on the grit on the surface itself and to near-surface spreading material (20% of the outer layers over the thickness) at a temperature above 100 ° C is not fully cured when working with short pressing times.
- the cover layers can not withstand the internal pressure of the trapped vapor in the plate at short pressing times and burst.
- the method should be characterized in that the pressed material is glued before spreading on the forming belt with an adhesive that can cure at a temperature of 90 ° to 105 ° C in less than 10 minutes, the material to be pressed is then scattered to a pressed material mat in that, after being compressed to the nominal thickness in the continuously operating press, the wood-based panel has a density of 860 to 950 kg / m 3 , after which the pressed material mat scattered from the material to be compacted is in front of the inlet continuous press is preheated over the full cross section to a temperature of 90 ° to 105 ° C, the pressed material mat is subjected to the inlet to the continuously operating press with a pressing pressure of 4 to 6 N / mm 2 , the pressed material mat is with a steel strip temperature of 90 ° - 130 ° C, preferably 110 ° to 120 ° C, heated, wherein the temperature of the pressed material mat during the continuous pressing in the entire cross section, the preheating temperature not lower and should not exceed
- the invention has for its object to provide a method by which it is possible to produce high-density multilayer material plates of oriented scattered chips.
- an oriented scattered material plate is to be created, which can be used as a cheaper alternative or as a competitor compared to the plywood panels with comparable properties.
- the object of the method is achieved by essentially spreading chips of a length of more than 180 mm in the longitudinal direction to a mat, the divided mat is compacted in a cycle press to a first density which is higher than a second density of the material plate to be produced , the chips are heated and plastified to a temperature above 120 ° C substantially during the compression with a fluid introduced at least over one surface side, the adhesive is cured substantially by the entry of the fluid and the concomitant increase in temperature in the cycle prior to opening wherein the curing of the adhesive in the material plate and the plasticization of the chips by the temperature increase and / or the compression is adjusted so that during or after opening the Clock press the material plate after a spring back has a second density of more than 800 kg / m 3 .
- the solution of the problem for a material plate is that the material plate has a density above 800 kg / m 3 and at least an odd number of at least five layers (22) oriented scattered chips (6), each layer (22) for at least one adjacent layer (22) has a different orientation of the chips (6) in the longitudinal direction (2), the Schnitzel have a length of over 180 mm in all layers and contains the material plate MDI or an equivalent binder.
- an optimized compression and a plasticization of the chips is achieved by the combination according to the invention.
- This makes it possible to limit the springback of the pressed plate during or after opening the press to less than 20%.
- the steam heats the wood evenly to over 120 ° and in addition it increases the humidity.
- the lignin in the raw material wood softens and a compression to over 800 kg / m 3 is essentially possible stress-free. Since in some cases a large amount of steam should be introduced into the mat in a few seconds, considerable losses of steam occur at the narrow surfaces of the mat, which must be additionally compensated. There are therefore high flow velocities of the fluid between the Chipping, which causes leaching of the binder.
- the material plate as a bearing covering, in particular as a floor covering on parallel and spaced support surfaces to be created taking advantage of their special properties or preferred direction.
- the material plate consisting of at least five layers, arranged with the vast number of aligned in the same longitudinal direction chips, respectively the corresponding layers, transversely to a possible support structure or support surfaces to constructional gaps, such as in containers on the ground by the Trapezoidal or U-profile frame construction available, to bridge.
- the neutral fiber has the correct orientation (transverse) to the bearing surfaces or the majority of the chips (the cover layers) are arranged transversely to the bearing surfaces, but the neutral fiber of the three-layer plate (middle layer ) has chips, which are oriented parallel to the bearing surfaces and are accordingly susceptible to the shear stress.
- the three-layer plate is extremely susceptible to bending loads (forklift tires, pallet supports), in the second case, the plate can only insufficiently withstand shear stresses in the neutral fiber.
- the invention means by adhesive or binder a so-called adhesive fleet, which consists in its main component of an adhesive.
- an adhesive emulsion, hardener, formaldehyde scavengers, dyes, insect repellent and antifungal agents and other additives are added. It is also common to use the adhesive without additives.
- the adhesive is preferably MDI (diphenylmethane diisocyanate) or PMDI (polymeric diphenylmethane diisocyanate) from the group of isocyanates used, which is particularly suitable for an application with steam.
- a cured plate preferably has a thickness of over 25 mm.
- the trimming of the mat parallel to the production direction is at least half the length of the chips, for example 200 mm long chips are trimmed at least 100 mm per longitudinal side or narrow side.
- the invention means that the chips reach a wood moisture content above 6% and a temperature above 120 ° during compaction.
- the increase in temperature above this temperature level is important for the plasticization and must be ensured throughout the several layers throughout.
- the disadvantages of the prior art have arisen here, since pure convection heaters can optimally heat the surfaces of a mat, but a penetrating sudden heating is not adjustable. Also can be achieved with a double belt press a high temperature above 120 ° Celsius only with high energy expenditure, since heated by passing through the heat transfer medium heating plates passing rolling bars and the adjacent steel strip must be heated by the rolling rods. The losses are correspondingly high. Also, a purely convective heat transfer at high temperatures leads much more to precoating topcoats, which additionally impede proper heat transfer into the interior of the chip mat.
- the proposed material plate (five-layer plate) or its use can arise on the one hand by the method according to the invention; but this can also be regarded as an independent material plate.
- FIG. 1 is shown a schematic and exemplary production process for producing a high-density material plate of wood or wood-like raw materials.
- shreds 6 are prepared from the raw materials in a preparation 1 and glued essentially with MDI as an adhesive.
- the glued chips 6 are then oriented in a forming station 12, usually consisting of several scattering stations with respect to their longitudinal direction 2 and placed on a continuously endless circulating forming belt in at least five layers 22 of a mat 19.
- the chips 6 are oriented and scattered in each layer 22 such that they have a substantially different orientation in their longitudinal direction 2 than the at least one adjacent layer 22.
- the mat 19 is divided in its length and in a cycle press 15 to a Material plate 1 pressed.
- the mat 19 may be subjected to a pre-treatment 18 before the pressing, which comprises a change in the temperature, the humidity and / or the density of the mat 19 and the chips 6, respectively.
- FIG. 2 is a five-layer material plate 1 with five layers 22 different orientation of the chips in their longitudinal direction 2 shown.
- FIG. 3 a diagram in which is shown in a particularly preferred embodiment.
- the chips 6 are heated and plasticized to a temperature 9 of more than 120 ° C., preferably to more than 130 ° C., more preferably to more than 140 ° C.
- the press plates of the cycle press can be preheated or heated to a temperature of more than 120 ° Celsius, but it is also conceivable to use the cycle press with passively heated press plates (heating by the fluid introduction during the production process).
- the mat 19 is compacted in the press, whereby the density D in FIG. 3 entered in the coordinate system of the y-axis steeply increased from top to bottom.
- the mat 19 reaches a predetermined density and it will begin to introduce a fluid into the mat 19.
- the fluid provides for a strong heating of the chips 6 to a temperature 9 above 120 ° C, which is preferably maintained during the hold time 17.
- a springback 21 of the material plate which has been compressed to a first density 3 during compaction, to a second density 4, wherein the second density should not be less than 800 kg / m 3 .
- the height of the first density 3 is measured from empirical values and / or from tests with differently used adhesives, fluids, such as water vapor, superheated steam or steam-air mixtures, temperatures, etc.
- the fluid is particularly preferred only when a third density 5 of the press contents is reached of more than 150 kg / m 3 initiated.
- the material plate 1 is not more than a second density 4 of 800 kg / m 3 , preferably to a density 4 of 850 kg / m 3 , particularly preferably to a density of 4th of 900 kg / m 3 , spring back.
- the springback 21 of the material plate 1 during and after opening of the cycle press 15 should be set to a maximum of 20%, preferably 10% of the first density 3.
- Next is a gradient curve with a density 3a in FIG. 3 located. This should clarify the possibility that in the holding time 17 no static compression must be driven, but that during the holding time different pressures on the material to be pressed respectively the material plate 1 can act.
- the line of density 3a shows a compression to about 10% under final gauge and during the hold time 17, the pressure is reduced and possibly even opened almost to final gauge the press.
- the resilience 21 can be controlled by adjusting the curing of the adhesive and / or by adjusting the plasticization of the chips 6 by the amount and / or the temperature of the fluid. Also, the amount of glue in the gluing and / or the degree plays the compression and / or the compression time 16 and / or the holding time 17 during the pressing cycle 23 a significantly supporting role. Particularly preferably, chips 6 have a thickness of 0.6 to 1.1 mm and / or a width of 5 to 90 mm in such a material plate or in the process for producing a high-density material plate proven.
- the mat 19 should be trimmed at its narrow sides 8 before entry into the cycle press 15 or before the division 14 by a trimming device 13, wherein the trimming 20 of the mat parallel to the production direction to at least half the length of the chips. 6 should be adjusted.
- Each layer of the spread mat 19 has a height of 10% to 35% of the total height of the mat.
- binders and / or additives such as emulsions, fungi or insect repellent can be added.
- FIG. 5 has a material plate 1 has a density over 800 kg / m 3 and includes an odd number of at least five layers 22 oriented scattered chips 6, each layer 22 to at least one adjacent layer 22 has a different orientation of the chips 6 in the longitudinal direction 2 and the Schnitzel have a length of over 180 mm in all layers and are essentially bound by MDI or an equivalent binder.
- a proportionate amount preferably in the single-digit percentage range, to be smaller Schnitzel than 180 mm use find.
- these arise from the Randbekladung and are returned to the production cycle.
- the trim 20, represented by a line in the edge region of the mat 19 corresponds to about half the length of a used Schnitzel.
- the production direction 7 goes into the plane.
- the surface side may have a very rough surface after compression, because especially at densities above 850 kg / m 3 or during the springback parts of the chips are pushed out of the surface side. If a rough surface is desired, this can be left.
- the material plate as covering plate or as a base plate for containers at least one surface side, preferably the useful side, ground. Depending on the effort and appearance, this can only affect the protruding chips, or a complete surface grinding is carried out.
- the use of the material plate 1 produced by the process as a durable coating 27 on a support structure 24 is favored consisting of several separated by distances 26 bearing surfaces 25, wherein the coating 27, consisting of one or more material plates 1, is arranged on the support structure 24 in that the majority of the layers 22 of the material plate 1 are the chips 6 arranged transversely to the extent of the bearing surfaces 25 in their longitudinal direction 2. That means that in the two upper and in the middle layer in one Five-layer plate, the chips 6 are arranged so that they are aligned parallel to the indicated bearing distance 26.
- the chips 6 are oriented in their longitudinal direction 2 longitudinally, transversely, longitudinally, transversely, along the direction of production to a mat 19, whereby the chips 6 of the individual layers 22 can preferably be scattered substantially at right angles to one another.
- a wheel 28 of a forklift or pallet truck arranged on the pad 27, a wheel 28 of a forklift or pallet truck.
- a pallet foot as a detail.
- a force arrow F is shown simplified perpendicular to the surface side of the covering.
- a cycle press for the production of material plates with a press frame and press plates arranged therein, wherein at least one press plate is adjustable in height and at least one press plate has fluid holes for spraying a surface side of the mat.
- the timing press is particularly characterized in that a control device is arranged in operative connection with a fluid device of the press plate, wherein the control device determines the actual values of the density of the mat between the press plate from the degree of compaction of the mat and the associated spreading density and uses these actual values to control the fluid device.
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- 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)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung einer hochdichten Werkstoffplatte aus holz- oder holzähnlichen Rohstoffen nach dem Oberbegriff des Anspruches 1. Weiter bezieht sich die Erfindung auf eine hochdichte Werkstoffplatte nach Anspruch 20, auf eine Verwendung der Werkstoffplatte nach Anspruch 27 und auf eine Taktpresse nach Anspruch 28.The invention relates to a method for producing a high-density material plate from wood or wood-like raw materials according to the preamble of
Zur Herstellung von Holzwerkstoffplatten werden üblicherweise diskontinuierliche Etagenpressen und kontinuierlich arbeitende Pressen verwendet, wobei in letzterer zwischen zwei umlaufenden Stahlbändern eine gestreute Pressgutmatte mit beleimten Streupartikeln unter Druck und Wärmeeintrag verpresst wird. Neben den reinen Partikelplatten (MDF) kommen auch gespante Holzschnitzel zur Anwendung, die in der Regel orientiert gestreut werden, um den hergestellten Holzwerkstoffplatten in Länge und Breite verstärkt Festigkeit zu verleihen. Dabei werden Herstellungsarten unterschieden für orientiert gestreute Platten in längs und quer Richtung (OSB) und in einer Orientierung rein in Längsrichtung (OSL). Üblicherweise werden derartige OSB- und OSL-Platten auf kontinuierlichen Doppelbandpressen mit Dichten bis maximal 750 kg/m3 hergestellt. Versuche mit unterschiedlichen Pressverfahren, die Dichten auf über 750 kg/m3 zu erhöhen, sind nicht erfolgreich gewesen, da die noch warmen Platten nach dem Verlassen der Presse aufplatzen oder einer zu starken Rückfederung unterliegen, so dass sich die Plattendicke stark erhöht wodurch die Plattendichte wieder deutlich absinkt.For the production of wood-based panels usually discontinuous floor presses and continuously operating presses are used, in the latter between two rotating steel belts a scattered pressed material mat is pressed with glued scattering particles under pressure and heat input. In addition to pure particle boards (MDF), chipboard wood chips are also used, which are usually spread in an oriented manner in order to increase the strength and strength of the wooden boards produced in their length and width. This will be production methods distinguished for oriented scattered plates in the longitudinal and transverse direction (OSB) and in an orientation purely in the longitudinal direction (OSL). Usually, such OSB and OSL boards are produced on continuous double belt presses with densities of up to 750 kg / m 3 . Experiments with different pressing methods to increase the densities to more than 750 kg / m 3 have not been successful, because the still hot plates burst after exiting the press or undergo too strong springback, so that the plate thickness increases greatly, causing the plate density again drops significantly.
Mit
Mit
Das Verfahren hat sich grundsätzlich bewährt. Es hat sich aber herausgestellt, dass die Steuerung und Regelung des komplexen Ablaufes der Herstellung einer derartigen Werkstoffplatte sehr kompliziert zu handhaben sind; insbesondere gilt dies bei einer so hochkomplexen Anlagentechnik wie einer kontinuierlich arbeitenden Presse. Auch die Belastungsgrenzen der einzelnen Maschinenelemente werden während der Herstellung einer derartigen hochdichten Platte nahezu ausgereizt, wenn nicht sogar überschritten. Proben der hergestellten Platten haben auch gezeigt, dass die Plastifizierung der Späne bei dicken Platten in der Mitte während einer kontinuierlichen Pressung nicht so stark eingetreten ist, wie erhofft.The procedure has proven itself in principle. However, it has been found that the control and regulation of the complex process of producing such a material plate are very complicated to handle; This applies in particular to such a highly complex system technology as a continuously operating press. The load limits of the individual machine elements are almost exhausted during the production of such a high-density plate, if not exceeded. Samples of the panels made have also shown that the plasticization of the shavings with thick panels in the middle during a continuous pressing has not occurred as much as was hoped.
Von weit reichender wirtschaftlicher Bedeutung ist mittlerweile der Wunsch nach hochdichten orientierten Schnitzelplatten in der Containerindustrie für Schiffs-, Lager-, Büro- oder Wohncontainer. Eine Vorgabe der chinesischen Industrie für Containerplatten schreibt eine Biegefestigkeit von 69 N/mm2 bei einem Auflagerabstand von 250 mm für 28 mm dicke Containerböden vor. Die europäische Industrie schreibt im Vergleich zur Prüfung der Biegefestigkeit höhere Auflagerabstände vor, die auch zu höheren Biegefestigkeiten führen. Der geringere Auflagerabstand von 250 mm führt aber bei der Biegeprüfung zu sehr hohen Schubbeanspruchungen in der neutralen Faser der Platte. Als Platten für Containerböden werden deshalb bisher vorwiegend Sperrholzplatten mit Dichten um die 900 kg/m3 eingesetzt. Neben der hohen Biegefestigkeit muss die Plattenoberfläche eine ausreichende Härte und genügend Abriebfestigkeit aufweisen. Zusätzlich muss die Last, die mittels eines Rades, zum Beispiel von einem Gabelstapler, auf die Platte aufgebracht wird, ausreichend in die Platte längs und quer zum Rad über die Abstützungen der Blechrillen am Containerboden verteilt werden.Of far-reaching economic importance is now the desire for high-density oriented chipboard in the container industry for ship, storage, office or residential containers. A requirement of the Chinese industry for container plates contributes a bending strength of 69 N / mm 2 a support distance of 250 mm for 28 mm thick container floors. European industry requires higher bearing distances compared to bending strength tests, which also leads to higher bending strengths. However, the smaller bearing distance of 250 mm leads to very high shear stresses in the neutral fiber of the plate during the bending test. As plates for container floors, plywood panels with densities of around 900 kg / m 3 have hitherto been used predominantly. In addition to the high flexural strength, the plate surface must have sufficient hardness and sufficient abrasion resistance. In addition, the load which is applied to the plate by means of a wheel, for example from a forklift, must be sufficiently distributed in the plate longitudinally and transversely to the wheel via the supports of the plate grooves on the container floor.
Aufgrund dieser hohen Anforderungen ist es bis heute nicht gelungen eine Platte aus Schnitzeln herzustellen, die den Anforderungen des Containerbaus genügt. Andererseits wird dringend nach einem Ersatz für Sperrholzplatten gesucht, da die benötigten Furniere für eine Sperrholzplatte teuer sind und zusätzlich eine Imprägnierung der Furniere mit Fungiziden (pilzhemmenden Mitteln) schwierig ist. Da ein hoher Prozentsatz von Containern auf Containerschiffen weltweit verschifft wird unterliegen viele dieser Containerplatten einer hohen Luftfeuchtigkeit in schlecht belüfteten Räumen, was ebenfalls einen regelmäßigen Austausch der Containerplatten bedingt. Eine Containerplatte die bereits durch die Herstellung resistent oder einen höheren Widerstand gegen Schimmel- und Pilzbefall bietet wäre hier durchaus von Vorteil.Because of these high requirements, it has not been possible to produce a slab of chips that meets the requirements of container construction. On the other hand, it is urgently searched for a replacement for plywood panels, because the required veneers for a plywood panel are expensive and in addition an impregnation of veneers with fungicides (fungicides) is difficult. Since a high percentage of containers are shipped on container ships worldwide, many of these container plates are subject to high humidity in poorly ventilated areas, which also necessitates regular replacement of the container panels. A container plate that is already resistant to manufacturing or a Higher resistance to mold and fungus attack would be quite advantageous here.
Der Erfindung liegt die Aufgabe zugrunde ein Verfahren anzugeben, mit dem es möglich ist hochdichte mehrschichtige Werkstoffplatten aus orientiert gestreuten Schnitzeln herzustellen. Weiter soll eine orientiert gestreute Werkstoffplatte geschaffen werden, die als eine kostengünstigere Alternative bzw. als ein Konkurrenzprodukt gegenüber den Sperrholzplatten bei vergleichbaren Eigenschaften verwendet werden kann.The invention has for its object to provide a method by which it is possible to produce high-density multilayer material plates of oriented scattered chips. Next, an oriented scattered material plate is to be created, which can be used as a cheaper alternative or as a competitor compared to the plywood panels with comparable properties.
Die Aufgabe für das Verfahren wird dadurch gelöst, dass im Wesentlichen Schnitzel einer Länge von über 180 mm in Längsrichtung zu einer Matte gestreut werden, die aufgeteilte Matte in einer Taktpresse auf eine erste Dichte verdichtet wird, die höher ist als eine zweite Dichte der herzustellenden Werkstoffplatte, die Schnitzel im Wesentlichen während der Verdichtung mit einem zumindest über eine Flächenseite eingebrachten Fluid auf eine Temperatur über 120° C aufgeheizt und plastifiziert werden, der Klebstoff im Wesentlichen durch den Eintrag des Fluids und die damit einhergehende Temperaturerhöhung in der Taktpresse vor dem Öffnen ausgehärtet wird, wobei die Aushärtung des Klebstoffes in der Werkstoffplatte und die Plastifizierung der Schnitzel durch die Temperaturerhöhung und/oder die Verdichtung so eingestellt wird, dass während oder nach dem Öffnen der Taktpresse die Werkstoffplatte nach einer Rückfederung eine zweite Dichte von mehr als 800 kg/m3 aufweist.The object of the method is achieved by essentially spreading chips of a length of more than 180 mm in the longitudinal direction to a mat, the divided mat is compacted in a cycle press to a first density which is higher than a second density of the material plate to be produced , the chips are heated and plastified to a temperature above 120 ° C substantially during the compression with a fluid introduced at least over one surface side, the adhesive is cured substantially by the entry of the fluid and the concomitant increase in temperature in the cycle prior to opening wherein the curing of the adhesive in the material plate and the plasticization of the chips by the temperature increase and / or the compression is adjusted so that during or after opening the Clock press the material plate after a spring back has a second density of more than 800 kg / m 3 .
Die Lösung der Aufgabe für eine Werkstoffplatte besteht darin, dass die Werkstoffplatte einer Dichte über 800 kg/m3 aufweist und zumindest aus einer ungeraden Anzahl von zumindest fünf Schichten (22) orientiert gestreuter Schnitzel (6) besteht, wobei jede Schicht (22) zur zumindest einen angrenzenden Schicht (22) eine andere Orientierung der Schnitzel (6) in Längsrichtung (2) aufweist, die Schnitzel einer Länge von über 180 mm in allen Schichten aufweisen und die Werkstoffplatte MDI oder ein gleichwertiges Bindemittel enthält.The solution of the problem for a material plate is that the material plate has a density above 800 kg / m 3 and at least an odd number of at least five layers (22) oriented scattered chips (6), each layer (22) for at least one adjacent layer (22) has a different orientation of the chips (6) in the longitudinal direction (2), the Schnitzel have a length of over 180 mm in all layers and contains the material plate MDI or an equivalent binder.
In vorteilhafter Weise wird durch die erfindungsgemäße Kombination eine optimierte Verdichtung und eine Plastifizierung der Schnitzel erreicht. Damit ist es möglich die Rückfederung der verpressten Platte während oder nach dem Öffnen der Presse auf weniger als 20% zu begrenzen. Denn durch den Dampf wird das Holz gleichmäßig auf über 120° erwärmt und zusätzlich wird die Feuchte erhöht. Dadurch wird das Lignin im Rohstoff Holz weich und eine Verdichtung auf über 800 kg/m3 ist im Wesentlichen spannungsfrei möglich. Da teilweise eine große Menge Dampf in die Matte in wenigen Sekunden eingebracht werden sollte, entstehen an den Mattenschmalflächen erhebliche Dampfverluste, die zusätzlich kompensiert werden müssen. Es entstehen deshalb hohe Strömungsgeschwindigkeiten des Fluids zwischen den Schnitzeln, was für Auswaschungen des Bindemittels sorgt. Es wurde nun gefunden, dass MDI oder PMDI im Wesentlichen an den Schnitzeln verbleibt und den Bestrebungen des Auswaschens entgegenwirkt, weil hohe Adhäsionskräfte wirken, und/oder das MDI oder das PMDI in die Holzschnitzel eindringen. Andere Kondensationsharze können in Teilen als Verdünner oder Streckmittel hinzu gegeben werden.Advantageously, an optimized compression and a plasticization of the chips is achieved by the combination according to the invention. This makes it possible to limit the springback of the pressed plate during or after opening the press to less than 20%. Because the steam heats the wood evenly to over 120 ° and in addition it increases the humidity. As a result, the lignin in the raw material wood softens and a compression to over 800 kg / m 3 is essentially possible stress-free. Since in some cases a large amount of steam should be introduced into the mat in a few seconds, considerable losses of steam occur at the narrow surfaces of the mat, which must be additionally compensated. There are therefore high flow velocities of the fluid between the Chipping, which causes leaching of the binder. It has now been found that MDI or PMDI essentially remains on the chips and counteracts the leaching efforts because high adhesion forces act and / or the MDI or PMDI penetrate the wood chips. Other condensation resins may be added in portions as a diluent or diluent.
In einem Teilaspekt der Erfindung soll eine Verwendung der Werkstoffplatte als tragender Belag, insbesondere als Bodenbelag auf parallel verlaufenden und beabstandeten Stützflächen unter Ausnutzung ihrer speziellen Eigenschaften bzw. Vorzugsrichtung geschaffen werden. Dazu wird die Werkstoffplatte, bestehend aus zumindest fünf Schichten, mit der überwiegenden Anzahl an in gleicher Längsrichtung orientierten Schnitzeln, respektive der entsprechenden Schichten, quer zu einer eventuellen Tragkonstruktion bzw. Abstützflächen angeordnet, um konstruktionsbedingte Spalte, wie zum Beispiel bei Containern am Boden durch die Blechtrapez- oder U-Profil-Rahmenkonstruktion vorhanden, zu überbrücken.In one aspect of the invention, a use of the material plate as a bearing covering, in particular as a floor covering on parallel and spaced support surfaces to be created taking advantage of their special properties or preferred direction. For this purpose, the material plate, consisting of at least five layers, arranged with the vast number of aligned in the same longitudinal direction chips, respectively the corresponding layers, transversely to a possible support structure or support surfaces to constructional gaps, such as in containers on the ground by the Trapezoidal or U-profile frame construction available, to bridge.
Durch die Fünfschichtigkeit und die Länge der Schnitzel über 180 mm und der entsprechenden Ausrichtung von zumindest drei Schichten und der damit verbundenen Ausrichtung der Schnitzeln quer zu den sich erstreckenden Stützflächen ergibt sich eine sehr geringe Durchbiegung, da auch die "neutrale Faser" der Werkstoffplatte durch ihre Fünfschichtigkeit eine Ausrichtung der Schnitzel in deren Länge aufweist, die quer zur Längserstreckung der Auflagerflächen orientiert ist. Dies ist im Übrigen der große Nachteil gegenüber einer herkömmlichen dreischichtigen OSB-Platte, auch wenn diese hochverdichtet verpresst wird. Entweder sind die Mehrzahl der Schnitzel parallel zur Längserstreckung der Auflagerflächen und die neutrale Faser weist die richtige Ausrichtung (quer) zu den Auflagerflächen auf oder die Mehrzahl der Schnitzel (die Deckschichten) sind quer zu den Auflagerflächen angeordnet, aber die neutrale Faser der Dreischichtplatte (Mittelschicht) weist Schnitzel auf, die parallel zu den Auflagerflächen orientiert sind und dementsprechend anfällig für die Scherbelastung sind. Im ersten Fall ist die Dreischichtplatte extrem anfällig für Biegebelastungen (Gabelstaplerreifen, Palettenauflager), im zweiten Fall kann die Platte nur unzureichend Scherbelastungen in der neutralen Faser vertragen.Due to the five-layeredness and the length of the chips over 180 mm and the corresponding orientation of at least three layers and the associated orientation of the chips transverse to the extending support surfaces results in a very low deflection, as well as the "neutral fiber" of the material plate by their Five layer has an orientation of the chips in the length, which is transverse to the longitudinal extent of the Support surfaces oriented. Incidentally, this is the big disadvantage compared to a conventional three-layer OSB board, even if it is compressed to a high density. Either the plurality of chips are parallel to the longitudinal extent of the bearing surfaces and the neutral fiber has the correct orientation (transverse) to the bearing surfaces or the majority of the chips (the cover layers) are arranged transversely to the bearing surfaces, but the neutral fiber of the three-layer plate (middle layer ) has chips, which are oriented parallel to the bearing surfaces and are accordingly susceptible to the shear stress. In the first case, the three-layer plate is extremely susceptible to bending loads (forklift tires, pallet supports), in the second case, the plate can only insufficiently withstand shear stresses in the neutral fiber.
Die Erfindung versteht unter Klebstoff oder Bindemittel eine so genannte Klebstoffflotte, die in ihrer Hauptkomponente aus einem Klebstoff besteht. Je nach Bedarf werden zusätzlich Emulsion, Härter, Formaldehydfänger, Farbstoffe, Insektenschutz und Pilzschutzmittel und andere Additive beigegeben. Es ist auch üblich den Klebstoff ohne Zusätze zu verwenden. Als Klebstoff kommt vorzugsweise MDI (Diphenylmethandiisocyanat) oder PMDI (polymeres Diphenylmethandiisocyanat) aus der Gruppe der Isocyanate zum Einsatz, das besonders geeignet ist für eine Anwendung mit Dampfeintrag. Dies liegt darin begründet, dass es zumindest teilweise in die Schnitzel eindringt, bei Dampfinjektionsanwendungen dadurch nicht oder nur teilweise ausgewaschen wird und bei einer Grenztemperatur (in etwa 105° C) schnell abbindet. Eine ausgehärtete Platte weist vorzugsweise eine Dicke von über 25 mm auf. die Besäumung der Matte parallel zur Produktionsrichtung minimal die halbe Länge der Schnitzel beträgt, beispielsweise bei 200 mm langen Schnitzeln werden je Längsseite respektive Schmalseite mindestens 100 mm besäumt.The invention means by adhesive or binder a so-called adhesive fleet, which consists in its main component of an adhesive. Depending on requirements, in addition emulsion, hardener, formaldehyde scavengers, dyes, insect repellent and antifungal agents and other additives are added. It is also common to use the adhesive without additives. As the adhesive is preferably MDI (diphenylmethane diisocyanate) or PMDI (polymeric diphenylmethane diisocyanate) from the group of isocyanates used, which is particularly suitable for an application with steam. This is due to the fact that it at least partially penetrates into the chips, in steam injection applications not or only partially is washed out and sets quickly at a limit temperature (about 105 ° C). A cured plate preferably has a thickness of over 25 mm. the trimming of the mat parallel to the production direction is at least half the length of the chips, for example 200 mm long chips are trimmed at least 100 mm per longitudinal side or narrow side.
Unter Plastifikation von Schnitzeln während der Verdichtung versteht die Erfindung, dass die Schnitzel beim Verdichten eine Holzfeuchte über 6% und eine Temperatur über 120° erreichen. Insbesondere die Temperaturerhöhung über diese Temperaturstufe ist wichtig für die Plastifizierung und muss über die mehreren Schichten durchgehend gewährleistet sein. Hier entstanden im Stand der Technik die Nachteile, da reine Konvektionsheizungen zwar die Oberflächen einer Matte optimal aufheizen können, aber eine durchdringende schlagartige Durchwärmung nicht einstellbar ist. Auch kann mit einer Doppelbandpresse eine hohe Temperatur über 120° Celsius nur mit hohem Energieaufwand erreicht werden, da von den mit Wärmeträgermedium durchflossenen Heizplatten vorbeilaufende Rollstangen erhitzt und über die Rollstangen das anliegende Stahlband aufgeheizt werden muss. Die Verluste sind entsprechend hoch. Auch führt eine rein konvektive Wärmeübertragung mit hohen Temperaturen viel mehr zu voraushärtenden Deckschichten, die einen ordentlichen Wärmetransfer in das Innere der Schnitzelmatte zusätzlich behindern.By plastification of chips during compaction, the invention means that the chips reach a wood moisture content above 6% and a temperature above 120 ° during compaction. In particular, the increase in temperature above this temperature level is important for the plasticization and must be ensured throughout the several layers throughout. The disadvantages of the prior art have arisen here, since pure convection heaters can optimally heat the surfaces of a mat, but a penetrating sudden heating is not adjustable. Also can be achieved with a double belt press a high temperature above 120 ° Celsius only with high energy expenditure, since heated by passing through the heat transfer medium heating plates passing rolling bars and the adjacent steel strip must be heated by the rolling rods. The losses are correspondingly high. Also, a purely convective heat transfer at high temperatures leads much more to precoating topcoats, which additionally impede proper heat transfer into the interior of the chip mat.
Die vorgeschlagene Werkstoffplatte (Fünfschichtplatte) bzw. deren Verwendung kann zum einen durch das erfindungsgemäße Verfahren entstehen; diese kann aber auch als eine eigenständige Werkstoffplatte angesehen werden.The proposed material plate (five-layer plate) or its use can arise on the one hand by the method according to the invention; but this can also be regarded as an independent material plate.
Weitere vorteilhafte Maßnahmen und Ausgestaltungen des Gegenstandes der Erfindung gehen aus den Unteransprüchen und der folgenden Beschreibung mit der Zeichnung hervor.Further advantageous measures and embodiments of the subject matter of the invention will become apparent from the dependent claims and the following description with the drawing.
Es zeigen:
Figur 1- den schematisch dargestellten Produktionsablauf einer Herstellung einer hochdichten Werkstoffplatte,
Figur 2- eine dreidimensionale Schnittzeichnung einer Werkstoffplatte mit fünf unterschiedliche orientierten Schichten der Schnitzel,
Figur 3- ein Zeit/Temperatur/Dichte-Diagramm während eines Presszyklus',
- Figur 4
- eine schematische Darstellung einer Werkstoffplatte als Belag auf einer Stützkonstruktion mit beispielhafter Belastung durch einen Palettenfuß und einem Rad eines Gabelstaplers respektive eines Palettenhubwagens,
Figur 5- eine Schnittdarstellung einer vorteilhaften Besäumung eines OSB- Mattenstranges und
Figur 6- einen Schnitt durch eine hochdichte Werkstoffplatte mit von der Flächenseite abstehenden Schnitzeln.
- FIG. 1
- the schematically illustrated production process of producing a high-density material plate,
- FIG. 2
- a three-dimensional sectional drawing of a material plate with five different oriented layers of chips,
- FIG. 3
- a time / temperature / density diagram during a pressing cycle ',
- FIG. 4
- a schematic representation of a material plate as a covering on a support structure with exemplary load by a Palettenfuß and a wheel of a forklift or a pallet truck,
- FIG. 5
- a sectional view of an advantageous edging an OSB mat strand and
- FIG. 6
- a section through a high-density material plate with projecting from the surface side chips.
In
Besonders vorteilhaft ist es, wenn bei sehr langen Schnitzeln 6 die Ränder einer zumindest fünfschichtig gestreuten Matte durch eine Besäumvorrichtung 13 besäumt werden, da sich, bedingt durch die bekannten und verwendbaren Streumaschinen, bei der Querorientierung zur Produktionsrichtung an den Rändern große Dichteunterschiede entstehen (
Die Rückfederung 21 kann besonders durch die Einstellung der Aushärtung des Klebstoffes und/oder durch die Einstellung der Plastifizierung der Schnitzel 6 durch die Menge und/oder die Temperatur des Fluides gesteuert werden. Auch spielt die Menge des Klebstoffes bei der Beleimung und/oder der Grad der Verdichtung und/oder die Verdichtungszeit 16 und/oder die Haltezeit 17 während des Presszyklus 23 eine wesentlich unterstützende Rolle. Besonders bevorzugt haben sich Schnitzel 6 einer Dicke von 0,6 bis 1,1 mm und/oder einer Breite von 5 bis 90 mm bei einer derartigen Werkstoffplatte bzw. bei dem Verfahren zur Herstellung einer hochdichten Werkstoffplatte bewährt. Es hat sich gezeigt, dass die Matte 19 an ihren Schmalseiten 8 vor dem Eintritt in die Taktpresse 15 oder vor der Aufteilung 14 durch eine Besäumvorrichtung 13 besäumt werden sollte, wobei die Besäumung 20 der Matte parallel zur Produktionsrichtung auf mindestens die halbe Länge der Schnitzel 6 eingestellt werden sollte. Jede Schicht der gestreuten Matte 19 weist eine Höhe von 10% bis 35%, bezogen auf die Gesamthöhe der matte, auf. Bei der Aufbereitung 11 der Schnitzel 6 können neben dem Klebstoff MDI anteilig weitere Bindemittel und/oder Zuschlagstoffe wie Emulsionen, Pilz- oder Insektenschutzmittel hinzugefügt werden.The
Unter anderem nach
Nach
Nach
To
Besonders bevorzugt werden die Schnitzel 6 in ihrer Längsrichtung 2 orientiert nacheinander längs, quer, längs, quer, längs zur Produktionsrichtung zu einer Matte 19 gestreut, wobei die Schnitzel 6 der einzelnen Schichten 22 vorzugsweise im Wesentlichen im rechten Winkel zueinander gestreut werden können. Zur Verdeutlichung der Belastungssituation ist in
Eine Taktpresse für die Herstellung von Werkstoffplatten mit einem Pressengestell und darin angeordneten Pressenplatten, wobei zumindest eine Pressenplatte in der Höhe verstellbar ist und zumindest eine Pressenplatte Fluidbohrungen zur Bedüsung einer Flächenseite der Matte aufweist. Die Taktpresse zeichnet sich besonders dadurch aus, dass eine Steuer- oder Regelungsvorrichtung in Wirkverbindung mit einer Fluidvorrichtung der Pressenplatte angeordnet ist, wobei die Steuer- oder Regelungsvorrichtung die aktuellen Werte der Dichte der Matte zwischen den Pressenplatte aus dem Verdichtungsgrad der Matte und der zugehörigen Streudichte ermittelt und diese aktuellen Werte zur Steuerung oder Regelung der Fluidvorrichtung verwendet.A cycle press for the production of material plates with a press frame and press plates arranged therein, wherein at least one press plate is adjustable in height and at least one press plate has fluid holes for spraying a surface side of the mat. The timing press is particularly characterized in that a control device is arranged in operative connection with a fluid device of the press plate, wherein the control device determines the actual values of the density of the mat between the press plate from the degree of compaction of the mat and the associated spreading density and uses these actual values to control the fluid device.
- 1.1.
- WerkstoffplatteMaterial board
- 2.Second
- Längsrichtung von 6Longitudinal direction of 6
- 3.Third
- erste Dichtefirst density
- 4.4th
- zweite Dichtesecond density
- 5.5th
- dritte Dichtethird density
- 6.6th
- Schnitzelschnitzel
- 7.7th
- Produktionsrichtungproduction direction
- 8.8th.
- Schmalseitenarrow side
- 9.9th
- Temperatur von 6Temperature of 6
- 10.10th
- Flächenseitesurface side
- 11.11th
- Aufbereitungprocessing
- 12.12th
- Formstationforming station
- 13.13th
- Besäumvorrichtungtrimming device
- 14.14th
- Aufteilungdivision
- 15.15th
- PressePress
- 16.16th
- Verdichtungszeitcompaction time
- 17.17th
- Haltezeithold time
- 18.18th
- Vorbehandlungpreparation
- 19.19th
- Mattemat
- 20.20th
- Besäumungtrimming
- 21.21st
- Rückfederungrebound
- 22.22nd
- Schichtlayer
- 23.23rd
- Presszykluspressing cycle
- 24.24th
- Tragkonstruktionsupporting structure
- 25.25th
- Auflagerflächebearing surface
- 26.26th
- Abstanddistance
- 27.27th
- Belagcovering
- 28.28th
- Rad Gabelstapler / PalettenhubwagenWheel forklift / pallet truck
- 29.29th
- Palettenfußpallet
Claims (28)
dadurch gekennzeichnet, dass
characterized in that
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE200910021016 DE102009021016A1 (en) | 2009-05-13 | 2009-05-13 | Process for producing a high-density material plate from wood or wood-like raw materials, a material plate and a use of the material plate |
Publications (2)
Publication Number | Publication Date |
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EP2251170A2 true EP2251170A2 (en) | 2010-11-17 |
EP2251170A3 EP2251170A3 (en) | 2012-11-14 |
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EP10005057A Withdrawn EP2251170A3 (en) | 2009-05-13 | 2010-05-12 | Method and cycle press for producing a high density material board made of wooden materials or materials similar to wood, high density material board and use of the material board |
Country Status (3)
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EP (1) | EP2251170A3 (en) |
CN (1) | CN101885202B (en) |
DE (1) | DE102009021016A1 (en) |
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DE102016110075A1 (en) * | 2016-05-31 | 2017-11-30 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Forming station and method for producing a multi-layer spreading material mat for pressing to material plates and a spreading material mat |
DE202017102815U1 (en) | 2017-05-10 | 2018-06-12 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Material board |
DE102017110122A1 (en) * | 2017-05-10 | 2018-11-15 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Method for producing a material plate and a material plate |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0814013A1 (en) * | 1996-06-20 | 1997-12-29 | HOFA Homann GmbH & Co. KG | Floor for the superstructure of a load-carrying trailer or motor vehicle |
DE10206861A1 (en) | 2002-02-18 | 2003-09-04 | Siempelkamp Masch & Anlagenbau | Method for compressing and hardening of fiberboard or chipboard, using steam and pre-heated steel bands |
DE102005035214A1 (en) | 2005-07-27 | 2007-02-01 | Dieffenbacher Gmbh + Co. Kg | Manufacture of wooden particle board, coats particles with specified adhesive, preheats before pressing and controls temperature over entire cross section |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1281528C (en) * | 1986-09-03 | 1991-03-19 | Derek Barnes | Waferboard lumber |
JP3050156B2 (en) * | 1996-05-31 | 2000-06-12 | ヤマハ株式会社 | Wood board manufacturing method |
US6479127B1 (en) * | 1999-10-12 | 2002-11-12 | J.M. Huber Corporation | Manufacture of multi-layered board with a unique resin system |
DE10349485A1 (en) * | 2003-10-21 | 2005-05-25 | Dieffenbacher Gmbh + Co. Kg | Process for the production of long shavings or long shavings with defined dimensions |
US7547488B2 (en) * | 2004-12-15 | 2009-06-16 | Weyerhaeuser Nr Company | Oriented strand board panel having improved strand alignment and a method for making the same |
CN100387413C (en) * | 2005-10-25 | 2008-05-14 | 南京林业大学 | Manufacturing method of large piece wood shaving laminated material |
US7662457B2 (en) * | 2006-06-26 | 2010-02-16 | Huber Engineered Woods Llc | Wood composite material containing strands of differing densities |
CN101066603A (en) * | 2006-11-08 | 2007-11-07 | 国家林业局北京林业机械研究所 | Process of making directional bamboo structure board |
-
2009
- 2009-05-13 DE DE200910021016 patent/DE102009021016A1/en not_active Withdrawn
-
2010
- 2010-05-12 EP EP10005057A patent/EP2251170A3/en not_active Withdrawn
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0814013A1 (en) * | 1996-06-20 | 1997-12-29 | HOFA Homann GmbH & Co. KG | Floor for the superstructure of a load-carrying trailer or motor vehicle |
DE10206861A1 (en) | 2002-02-18 | 2003-09-04 | Siempelkamp Masch & Anlagenbau | Method for compressing and hardening of fiberboard or chipboard, using steam and pre-heated steel bands |
DE102005035214A1 (en) | 2005-07-27 | 2007-02-01 | Dieffenbacher Gmbh + Co. Kg | Manufacture of wooden particle board, coats particles with specified adhesive, preheats before pressing and controls temperature over entire cross section |
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DE102009021016A1 (en) | 2010-11-18 |
CN101885202A (en) | 2010-11-17 |
EP2251170A3 (en) | 2012-11-14 |
CN101885202B (en) | 2015-09-09 |
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