EP0585428B1 - Process for producing pressure formed synthetic resin bodies - Google Patents
Process for producing pressure formed synthetic resin bodies Download PDFInfo
- Publication number
- EP0585428B1 EP0585428B1 EP93905069A EP93905069A EP0585428B1 EP 0585428 B1 EP0585428 B1 EP 0585428B1 EP 93905069 A EP93905069 A EP 93905069A EP 93905069 A EP93905069 A EP 93905069A EP 0585428 B1 EP0585428 B1 EP 0585428B1
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- EP
- European Patent Office
- Prior art keywords
- process according
- fibrous materials
- binding agent
- flame retardant
- dried
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229920003002 synthetic resin Polymers 0.000 title abstract description 4
- 239000000057 synthetic resin Substances 0.000 title abstract description 4
- 239000011230 binding agent Substances 0.000 claims abstract description 29
- 239000002657 fibrous material Substances 0.000 claims abstract description 22
- 238000005470 impregnation Methods 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 15
- 238000009833 condensation Methods 0.000 claims abstract description 7
- 230000005494 condensation Effects 0.000 claims abstract description 7
- 229920002522 Wood fibre Polymers 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 19
- 239000003063 flame retardant Substances 0.000 claims description 16
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 3
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 229910017464 nitrogen compound Inorganic materials 0.000 claims description 2
- 150000002830 nitrogen compounds Chemical class 0.000 claims description 2
- -1 nitrogen-phosphorus compound Chemical class 0.000 claims description 2
- 150000002989 phenols Chemical class 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 150000001642 boronic acid derivatives Chemical class 0.000 claims 1
- 239000013590 bulk material Substances 0.000 claims 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 5
- 239000002025 wood fiber Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 238000000576 coating method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000004114 Ammonium polyphosphate Substances 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 235000019826 ammonium polyphosphate Nutrition 0.000 description 1
- 229920001276 ammonium polyphosphate Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/06—Making particle boards or fibreboards, with preformed covering layers, the particles or fibres being compressed with the layers to a board in one single pressing operation
Definitions
- the invention relates to a process for the production of a synthetic resin compression molding, in which, in one impregnation step, fiber materials, such as wood fibers in the form of a bed, are applied to a conveyor belt for the continuous production of a pre-compact or a raw plate and then, if appropriate, separating papers on both sides with a binder consisting of a condensation resin or resin mixture based on phenols and / or amino compounds and aldehyde such as formaldehyde have been coated, and in which the layer structure thus formed is continuously compressed to an average density in the range between 900 and 1200 kg / m3 and is heated to a higher temperature at which the viscosity of the binder is reduced, so that the binder penetrates completely into the pore volume of the compressed fiber mass and, if appropriate, is subsequently cured.
- fiber materials such as wood fibers in the form of a bed
- the water resistance is reduced by the properties of the flame retardants used in the known method, since large amounts of water-soluble flame retardants are added to the binder, which are partially leached out in the wet area, in particular when the laminated sheet made by the known method is used, as a result of which further points of attack for moisture can arise.
- the invention is based on the object of specifying a method of the type described at the outset which brings about a laminate with improved performance properties with regard to water resistance and flame resistance.
- a method of the type described at the outset which is characterized in that the loose fiber materials are intimately mixed with the binder in a pre-impregnation step, for example in the blowline 3, the surface of the loose fiber materials being regularly coated with the binder , and that these pre-impregnated fiber materials are then dried in a hot air stream 6 to a residual moisture of at most 6% and that these dried, pre-impregnated fiber materials are then used in the impregnation step.
- Another advantage of the invention is that a solid, water-insoluble flame retardant which is dispersed in the binder can be added to the binder in the pre-impregnation step and this flame retardant consists essentially of a water-insoluble nitrogen compound or of a water-insoluble nitrogen-phosphorus compound and borate is added to this flame retardant are, the amount of flame retardant applied is 5-20% by weight based on the dry fiber material.
- the object of the invention is further achieved in that additional fiber materials in loose form and / or in the form of woven fabrics, scrims, mats, nonwovens or the like are added for the impregnation step and the additionally added fiber materials consist of glass fibers, synthetic fibers or natural fibers.
- a further advantage of the process according to the invention is that a condensation resin or resin mixture in liquid form is used as the binder, which has a solid resin content of more than 80% by weight and a water content of at most 8% by weight, preferably at most 6% by weight. contains, the resin application in the pre-impregnation step between 10 and 15% solid resin based on the dry fiber material.
- FIGS. 1a and 1b The method according to the invention is explained in more detail with reference to FIGS. 1a and 1b, the pre-impregnation step being shown in FIG. 1a and the impregnation step in FIG. 1b, and an exemplary embodiment.
- wood chips are softened with water vapor at approx. 170 ° C. and comminuted into wood fibers in the refiner 1 at a pressure of approx. 4-5 bar. These are discharged continuously via the blow valve 2 from the refiner into the blowline 3 under a high pressure drop, as a result of which a turbulent flow is generated.
- a binder for example a phenolic resin with a low degree of condensation and consequently a relatively low viscosity, in which a solid flame retardant is dispersed, is introduced into the blowline 3 at a point 5 via a pipeline 4.
- a water-insoluble ammonium polyphosphate can be used as the flame retardant.
- the wood fibers in the pre-impregnation step are coated with the flame retardant binder up to an order of 15% based on dry matter.
- the free-floating fibers are wetted uniformly on their surface by the binder and, on the other hand, the particles of the flame retardant are glued to the fibers, so that a uniform distribution of the flame retardant is retained during further processing of these pre-impregnated fibers.
- These pre-impregnated fibers are then introduced into the dryer tube 6, which is fed with hot air by a hot air blower 7, and dried to a moisture content of, for example, 4%.
- the fibers thus dried are then introduced into a fiber bunker 9 via a cyclone 8 and can be stored there until the impregnation cut.
- the pre-impregnated wood fibers in the form of a fiber bed 10 are applied to a conveyor belt 12 from the scattering station 11.
- Unimpregnated fibers of other types, such as glass fibers, can be added to the pre-impregnated fibers.
- the basis weight of the fiber fill is continuously checked by means of a balance 13.
- the fiber bed 10 is then pre-compressed in a pre-press 14, 14 '.
- Release papers 15, 15 ' are drawn off from the supply rolls 16 and coated on one side with the highly viscous, water-free binder via the coating installation 17, 17'.
- the basis weight is checked with a basis weight device 18, 18 '.
- the structure thus formed then passes through a belt press 20 which is equipped with a heating zone 21 and a cooling zone 22.
- the heating zone 21 the binder from the coatings of the release papers 25, 25 'penetrates into the fiber cake 19 from both sides. Since the fibers are evenly wetted with the binder from the pre-impregnation, the binder is distributed evenly in the spaces between the fibers. In order to prevent undesired curing of the binder, this composite is cooled in the cooling zone 22 to a temperature of at least 40 ° C.
- the release papers are then pulled off via the rollers 23, 23 ', the band-shaped composite is cut to length in the cutting device 24 and stacked. If the length of the cooling zone 22 is not sufficient for the desired cooling, a cooling star can be switched on between the cutting device 24 and the stacking.
- a pre-compact produced by the process according to the invention is pressed as core material in a high-pressure press at 140 ° C. and 70 bar for 20 min between two decorative papers impregnated with melamine resin, the presses contained in the pre-compact The resins flow well and then harden.
- the method for producing a pre-compact which is described with reference to the figures, which is used in the production of a plate-shaped high-pressure molded body, can also be used directly, with corresponding modifications, for the production of high-pressure molded bodies.
- This is achieved, for example, by pressing pressure in the belt press 20 e.g. to 50 bar and the pressing temperature increased to 150 ° C and the dwell time of the layer structure e.g. extended to 10 minutes, so that the binder contained in the layer initially flows well and then hardens.
- a raw plate is then removed from the belt press 20, the z. B. is cooled to 30 ° C in a downstream, cooled belt press. The raw plate is then cut to length and decoratively painted for further use in a known manner.
- Such decorative high-pressure molded articles of greater thickness are suitable, for example, for the production of self-supporting components or as weatherproof panels for outdoor use.
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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)
- Laminated Bodies (AREA)
- Printing Methods (AREA)
- Printing Plates And Materials Therefor (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Materials For Medical Uses (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines Kunstharz-Druckformkörpers, bei dem in einem Imprägnierschritt Fasermaterialien, wie beispielsweise Holzfasern in Form einer Schüttung auf ein Förderband zur kontinuierlichen Herstellung eines Vorpreßlings oder einer Rohplatte aufgebracht und auf diese anschließend gegebenenfalls beidseitig Trennpapiere, die mit einem Bindemittel bestehend aus einem Kondensationsharz oder -harzgemisch auf Basis von Phenolen und/oder Aminoverbindungen und Aldehyd wie Formaldehyd beschichtet worden sind, aufkaschiert werden, und bei dem der so gebildete Schichtaufbau kontinuierlich auf ein durchschnittliches mittleres Raumgewicht im Bereich zwischen 900 und 1200 kg/m³ komprimiert und auf eine höhere Temperatur aufgeheizt wird, bei der die Viskosität des Bindemittels verringert ist, sodaß das Bindemittel vollständig in das Porenvolumen der komprimierten Fasermasse eindringt und gegebenenfalls in der Folge ausgehärtet wird.The invention relates to a process for the production of a synthetic resin compression molding, in which, in one impregnation step, fiber materials, such as wood fibers in the form of a bed, are applied to a conveyor belt for the continuous production of a pre-compact or a raw plate and then, if appropriate, separating papers on both sides with a binder consisting of a condensation resin or resin mixture based on phenols and / or amino compounds and aldehyde such as formaldehyde have been coated, and in which the layer structure thus formed is continuously compressed to an average density in the range between 900 and 1200 kg / m³ and is heated to a higher temperature at which the viscosity of the binder is reduced, so that the binder penetrates completely into the pore volume of the compressed fiber mass and, if appropriate, is subsequently cured.
Ein derartiges Verfahren wird in der WO 90/13403 beschrieben, welches zu Druckformkörpern führt, die beispielsweise für die Herstellung von dekorativen Kunstharz-Hochdrucklaminaten für die Außenanwendung eingesetzt werden, wobei insbesondere bei der Außenanwendung die Wasserbeständigkeit und Flammwidrigkeit von großer Bedeutung ist.Such a method is described in WO 90/13403, which leads to compression moldings which are used, for example, for the production of decorative high-pressure synthetic resin laminates for outdoor use, water resistance and flame retardancy being particularly important for outdoor use.
Ferner hat es sich gezeigt, daß eine durch das bekannte Herstellungsverfahren bedingte unregelmäßige Beharzung des Fasermaterials zu einem porösen Schichtpreßstoff führt, dessen Wasserbeständigkeit reduziert ist. Der dadurch bewirkte wechselnde Feuchtigkeitsgehalt im Schichtpreßstoff führt zu Spannungen im Material, welche insbesondere an den Schnittkanten zu Rißbildungen verursachen kann.Furthermore, it has been shown that an irregular resinification of the fiber material due to the known production process leads to a porous laminate whose water resistance is reduced. The resulting changing moisture content in the laminate leads to tension in the material, which can cause cracks, particularly at the cut edges.
Ferner wird die Wasserbeständigkeit durch die Eigenschaften der in dem bekannten Verfahren eingesetzten Flammschutzmittel reduziert, da dem Bindemittel große Mengen an wasserlöslichen Flammschutzmitteln zugesetzt werden, welche insbesondere bei der Verwendung der duch das bekannte Verfahren hergestellten Schichtpreßstoffplatte im Naßbereich teilweise ausgelaugt werden, wodurch weitere Angriffstellen für Feuchtigkeit entstehen können.Furthermore, the water resistance is reduced by the properties of the flame retardants used in the known method, since large amounts of water-soluble flame retardants are added to the binder, which are partially leached out in the wet area, in particular when the laminated sheet made by the known method is used, as a result of which further points of attack for moisture can arise.
Der Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Art anzugeben, das eine Schichtpreßstoffplatte mit verbesserten Gebrauchseigenschaften hinsichtlich Wasserbeständigkeit und Flammwidrigkeit bewirkt.The invention is based on the object of specifying a method of the type described at the outset which brings about a laminate with improved performance properties with regard to water resistance and flame resistance.
Diese Aufgabe wird durch ein Verfahren der eingangs beschriebenen Art gelöst, das dadurch gekennzeichnet ist, daß die losen Fasermaterialien in einem Vorimprägnierschritt, beispielsweise in der Blowline 3, mit dem Bindemittel innigst vermischt werden, wobei die Oberfläche der losen Fasermaterialien regelmäßig mit dem Bindemittel beschichtet wird, und daß anschließend diese vorimprägnierten Fasermaterialien in einem heißen Luftstrom 6 auf eine Restfeuchte von maximal 6% getrocknet werden und daß anschließend diese getrockneten, vorimprägnierten Fasermaterialien in den Imprägnierschritt eingesetzt werden.This object is achieved by a method of the type described at the outset, which is characterized in that the loose fiber materials are intimately mixed with the binder in a pre-impregnation step, for example in the
Ein weiterer Vorteil der Erfindung besteht darin, daß im Vorimprägnierschritt dem Bindemittel ein festes, wasserunlösliches Flammschutzmittel, welches im Bindemittel dispergiert ist, zugesetzt werden kann und dieses Flammschutzmittel im wesentlichen aus einer wasserunlöslichen Stickstoffverbindung oder aus einer wasserunlöslichen Stickstoff-Phosphorverbindung besteht und diesem Flammschutzmittel Borate zugesetzt werden, wobei die aufgebrachte Flammschutzmittelmenge 5 - 20 Gew.% bezogen auf das trockene Fasermaterial beträgt.Another advantage of the invention is that a solid, water-insoluble flame retardant which is dispersed in the binder can be added to the binder in the pre-impregnation step and this flame retardant consists essentially of a water-insoluble nitrogen compound or of a water-insoluble nitrogen-phosphorus compound and borate is added to this flame retardant are, the amount of flame retardant applied is 5-20% by weight based on the dry fiber material.
Die Aufgabe der Erfindung wird weiters dadurch gelöst, daß für den Imprägnierschritt zusätzlich Fasermaterialien in loser Form und/oder in Form von Geweben, Gelegen, Matten, Vliesen oder dgl beigemengt werden und die zusätzlich beigemengten Fasermaterialien aus Glasfasern, Kunstfasern oder aus Naturfasern bestehen.The object of the invention is further achieved in that additional fiber materials in loose form and / or in the form of woven fabrics, scrims, mats, nonwovens or the like are added for the impregnation step and the additionally added fiber materials consist of glass fibers, synthetic fibers or natural fibers.
Ein weiterer Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß als Bindemittel ein Kondensationsharz oder -harzgemisch in flüssiger Form verwendet wird, welches einen Festharzgehalt von mehr als 80 Gew.% und einen Wassergehalt von höchstens 8 Gew-%, vorzugsweise höchstens 6 Gew.%, enthält, wobei der Harzauftrag im Vorimprägnierungsschritt zwischen 10 und 15% Festharz bezogen auf das trockene Fasermaterial beträgt.A further advantage of the process according to the invention is that a condensation resin or resin mixture in liquid form is used as the binder, which has a solid resin content of more than 80% by weight and a water content of at most 8% by weight, preferably at most 6% by weight. contains, the resin application in the pre-impregnation step between 10 and 15% solid resin based on the dry fiber material.
Das erfindungsgemäße Verfahren wird anhand der Figuren 1a und 1b, wobei in Fig. 1a der Vorimprägnierschritt und in Fig. 1b der Imprägnierschritt angeführt ist, sowie anhand eines Ausführungsbeispiels näher erläutert.The method according to the invention is explained in more detail with reference to FIGS. 1a and 1b, the pre-impregnation step being shown in FIG. 1a and the impregnation step in FIG. 1b, and an exemplary embodiment.
Dabei werden gemäß einer Vorrichtung nach Fig. 1a Holzhackschnitzel mit Wasserdampf bei ca. 170°C erweicht und im Refiner 1 bei einem Druck von ca. 4 - 5 bar zu Holzfasern zerkleinert. Diese werden kontinuierlich über das Blasventil 2 aus dem Refiner in die Blowline 3 unter hohem Druckabfall ausgetragen, wodurch eine turbulente Strömung erzeugt wird. Über eine Rohrleitung 4 wird ein Bindemittel, beispielsweise ein Phenolharz mit niedrigem Kondensationsgrad und demzufolge relativ niedriger Viskosität, in welchem ein festes Flammschutzmittel dispergiert ist, an der Stelle 5 in die Blowline 3 eingetragen. Als Flammschutzmittel kann beispielsweise ein wasserunlösliches Ammoniumpolyphosphat eingesetzt werden. Durch die turbulenten Strömungsverhältnisse in der Blowline 3 werden die Holzfasern im Vorimprägnierungsschritt mit dem mit Flammschutzmittel versehenen Bindemittel bis zu einem Auftrag von 15% bezogen auf Trockensubstanz überzogen. Dabei werden einerseits die frei schwebenden Fasern vom Bindemittel gleichmäßig an ihrere Oberfläche benetzt und andererseits werden die Partikel des Flammschutzmittels mit den Fasern verklebt, sodaß bei der Weiterverarbeitung dieser vorimprägnierten Fasern eine gleichmäßige Verteilung des Flammschutzmittels erhalten bleibt. Anschließend werden diese vorimprägnierten Fasern in das Trocknerrohr 6, welches durch ein Heißluftgebläse 7 mit heißer Luft gespeist wird, eingebracht und auf einen Feuchtigkeitsgehalt von beispielsweise 4% getrocknet. Danach werden die so getrockneten Fasern über einen Zyklon 8 in einen Faserbunker 9 eingebracht und können dort bis zum Imprägnierschnitt gelagert werden.1a, wood chips are softened with water vapor at approx. 170 ° C. and comminuted into wood fibers in the
Bei der Imprägnierung gemäß einer Vorrichtung nach Fig. 1b werden aus der Streustation 11 die vorimprägnierten Holzfasern in Form einer Faserschüttung 10 auf ein Förderband 12 aufgebracht. Dabei können den vorimprägnierten Fasern unimprägnierte Fasern anderer Art, wie beispielsweise Glasfasern, beigemengt werden. Das Flächengewicht der Faserschüttung mittels einer Waage 13 laufend kontrolliert. Anschließend wird die Faserschüttung 10 in einer Vorpresse 14, 14' vorverdichtet. Von den Vorratsrollen 16 werden Trennpapiere 15, 15' abgezogen und mit dem hochviskosen, wasserfreien Bindemittel über die Streichanlage 17, 17' einseitig beschichtet. Das Flächengewicht wird mit einer Flächengewichtseinrichtung 18, 18' kontrolliert. Die be-schichteten Trennpapiere 25, 25' werden nun an beiden Seiten am vorverdichteten Faserkuchen 19 mit den beschichteten Seiten zum Faserkuchen hin aufkaschiert. Der so gebildete Aufbau durchläuft dann eine Bandpresse 20, welche mit einer Heizzone 21 und einer Kühlzone 22 ausgestattet ist. In der Heizzone 21 dringt das Bindemittel von den Beschichtungen der Trennpapiere 25, 25' von beiden Seiten in den Faserkuchen 19 ein. Da die Fasern schon von der Vorimprägnierung her gleichmäßig mit dem Bindemittel benetzt sind, verteilt sich das Bindemittel dabei auch gleichmäßig in den Zwischenräumen zwischen den Fasern. Um eine ungewünschte Aushärtung des Bindemittels zu verhindern, wird dieser Verbund in der Kühlzone 22 auf eine Temperatur von zumindest 40°C gekühlt. Anschließend werden über die Rollen 23, 23' die Trennpapiere abgezogen, der bandförmige Verbund wird in der Ablängeinrichtung 24 in Einzelstücke abgelängt und abgestapelt. Reicht die Länge der Kühlzone 22 für die gewünschte Abkühlung nicht aus, kann zwischen der Ablängeinrichtung 24 und der Abstapelung noch ein Kühlstern eingeschaltet werden.In the impregnation according to a device according to FIG. 1 b, the pre-impregnated wood fibers in the form of a
Zur Herstellung eines plattenförmigen, dekorativen Hochdruckformkörpers mit einer Dicke von 6 mm werden - zwischen zwei mit Melaminharz imprägnierten Dekorpapieren ein nach dem erfindungsgemäßen Verfahren hergestellter Vorpreßling als Kernmaterial in einer Hochdruckpresse bei 140°C und 70 bar während 20 min verpreßt, wobei die im Vorpreßling enthaltenen Harze gut verfließen und in der Folge aushärten.In order to produce a plate-shaped, decorative high-pressure molded body with a thickness of 6 mm, a pre-compact produced by the process according to the invention is pressed as core material in a high-pressure press at 140 ° C. and 70 bar for 20 min between two decorative papers impregnated with melamine resin, the presses contained in the pre-compact The resins flow well and then harden.
Das anhand der Figuren beschriebene Verfahren zur Herstellung eines Vorpreßlings, welcher bei der Erzeugung eines plattenförmigen Hochdruckformkörpers eingesetzt wird, kann mit entsprechenden Abänderungen auch direkt zur Herstellung von Hochdruckformkörpern verwendet werden. Dies wird z.B dadurch realisiert, daß man in der Bandpresse 20 den Preßdruck z.B. auf 50 bar und die Preßtemperatur auf 150°C erhöht sowie die Verweildauer des Schichtaufbaus z.B. auf 10 min verlängert, sodaß das im Schichtaufbau enhaltene Bindemittel zunächst gut verfließt und in der Folge aushärtet. Aus der Bandpresse 20 wird dann eine Rohplatte abgeführt, die z. B. in einer nachgeschalteten, gekühlten Bandpresse auf 30°C abgekühlt wird. Die Rohplatte wird dann abgelängt und für den weiteren Gebrauch in bekannter Weise dekorativ lackiert.The method for producing a pre-compact, which is described with reference to the figures, which is used in the production of a plate-shaped high-pressure molded body, can also be used directly, with corresponding modifications, for the production of high-pressure molded bodies. This is achieved, for example, by pressing pressure in the belt press 20 e.g. to 50 bar and the pressing temperature increased to 150 ° C and the dwell time of the layer structure e.g. extended to 10 minutes, so that the binder contained in the layer initially flows well and then hardens. A raw plate is then removed from the
Derartige dekorative Hochdruckformkörper größerer Stärke (z.B. 6 und 15 mm dick) eignen sich beispielsweise für die Herstellung selbsttragender Bauteile bzw. als witterungsfeste Platten in der Außenanwendung.Such decorative high-pressure molded articles of greater thickness (for example 6 and 15 mm thick) are suitable, for example, for the production of self-supporting components or as weatherproof panels for outdoor use.
Claims (12)
- A process for manufacturing a moulded block, in which in one impregnation step fibrous materials such as wood fibres for instance, are applied in form of a bulk material (10) to a belt conveyor (12) for the continuous manufacture of a rough-pressed blank or of a crude plate, and thereafter eventually on both sides are covered with intermediate layers consisting of paper (25,25') coated on one side with a binding agent consisting of a condensation resin or mixture thereof based on phenols and/or amino compounds and aldehyde, such as formaldehyde, in that the covered structure (19) formed in this way is compressed continuously to an average mean volumetric weight in the range between 900 and 1200 kg/mn , and is heated to a higher temperature, at which the viscosity of the binding agent is reduced, so that the binding agent penetrates completely into the pore volume of the compressed fibre mass and is eventually subsequently cured, characterized in that the loose fibrous materials are mixed extensively in a preimpregnation step, for instance in a blow line (3), with the binding agent, in that the surface of the loose fibrous materials is coated regularly with the binding agent, and that subsequently these preimpregnated fibrous materials are dried in a hot air-flow (6) to a residual moisture of a maximum of 6% and that thereafter these dried preimpreganted fibrous materials pass to the impregnation step.
- A process according to claim 1, characterized in that in the preimpregnation step is added to the binding agent a solid water insoluble flame retardant which is dispersed in the binding agent.
- A process according to claim 2, characterized in that the flame retardant consists essentially of a water insoluble nitrogen compound.
- A process according to claim 2, characterized in that the flame retardant consists essentially of a water insoluble nitrogen-phosphorus compound.
- A process according to one of claims 2 to 4, characterized in that borates are added to the flame retardant.
- A process according to one of claims 2 to 5, characterized in that the quantity of the applied flame retardant is 5 - 20 %-wt. in relation to the dried fibrous material.
- A process according to one of claims 1 to 6, characterized in that for the impregnation step fibrous materials in loose and/or woven or laid form, mats, fleeces or the like are additionally mixed.
- A process according to claim 7, characterized in that the additionally mixed fibrous materials consist of glass fibres.
- A process according to claim 7, characterized in that the additionally mixed fibrous materials consist of natural fibres.
- A process according to claim 7, characterized in that the additionally mixed fibrous materials consist of synthetic fibres.
- A process according to one of claims 1 - 10, characterized in that as binding agent a solvent-free condensation resin or mixture thereof in liquid form, which has a content of solid resin of more than 80 %-wt. and a water content of a maximum of 8 %-wt., preferably a maximum of 6 %-wt., is used.
- A process according to one of claims 1 - 11, characterized in that the resin applied in the preimpregnation step is between 10 and 15% solid resin in relation to the dried fibrous material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0041392A AT397805B (en) | 1992-03-04 | 1992-03-04 | METHOD FOR PRODUCING A SYNTHETIC RESIN PRINTING BODY |
| AT413/92 | 1992-03-04 | ||
| PCT/AT1993/000037 WO1993017845A1 (en) | 1992-03-04 | 1993-03-04 | Process for producing pressure formed synthetic resin bodies |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0585428A1 EP0585428A1 (en) | 1994-03-09 |
| EP0585428B1 true EP0585428B1 (en) | 1995-08-30 |
Family
ID=3489968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93905069A Revoked EP0585428B1 (en) | 1992-03-04 | 1993-03-04 | Process for producing pressure formed synthetic resin bodies |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0585428B1 (en) |
| AT (2) | AT397805B (en) |
| AU (1) | AU3620293A (en) |
| DE (1) | DE59300533D1 (en) |
| WO (1) | WO1993017845A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744762A (en) * | 2012-07-19 | 2012-10-24 | 昆山吉美川纤维科技有限公司 | Oven for fireboard production |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2168682A1 (en) * | 1995-06-02 | 1996-12-03 | David M. Harmon | Method and apparatus for reducing blowline obstructions during production of cellulosic composites |
| DE19746383A1 (en) * | 1997-10-21 | 1999-04-22 | Hofa Homann Gmbh & Co Kg | Fiber panel, manufacturing plant and process |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1560817B1 (en) * | 1965-07-28 | 1971-08-12 | Gruenzweig & Hartmann | Process for the production of, in particular, plate-shaped porous molded bodies made of glass or mineral fibers and the like. Like. And a heat-curable binder |
| AT338003B (en) * | 1975-10-21 | 1977-07-25 | Marischler Gerhard Dipl Ing | PROCESS FOR THE MANUFACTURING OF WOODEN CHIPBOARD MATERIAL USING ACCELERATED HARDENING PHENOLIC RESIN GLUE |
| SU1544570A1 (en) * | 1988-02-15 | 1990-02-23 | Flomenblit Avram | Arrangement for forming fibrous heat-insulating boards |
| US5093058A (en) * | 1989-03-20 | 1992-03-03 | Medite Corporation | Apparatus and method of manufacturing synthetic boards |
| 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 |
-
1992
- 1992-03-04 AT AT0041392A patent/AT397805B/en not_active IP Right Cessation
-
1993
- 1993-03-04 DE DE59300533T patent/DE59300533D1/en not_active Revoked
- 1993-03-04 WO PCT/AT1993/000037 patent/WO1993017845A1/en not_active Ceased
- 1993-03-04 AU AU36202/93A patent/AU3620293A/en not_active Abandoned
- 1993-03-04 EP EP93905069A patent/EP0585428B1/en not_active Revoked
- 1993-03-04 AT AT93905069T patent/ATE127065T1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744762A (en) * | 2012-07-19 | 2012-10-24 | 昆山吉美川纤维科技有限公司 | Oven for fireboard production |
Also Published As
| Publication number | Publication date |
|---|---|
| ATA41392A (en) | 1993-11-15 |
| WO1993017845A1 (en) | 1993-09-16 |
| DE59300533D1 (en) | 1995-10-05 |
| ATE127065T1 (en) | 1995-09-15 |
| AT397805B (en) | 1994-07-25 |
| EP0585428A1 (en) | 1994-03-09 |
| AU3620293A (en) | 1993-10-05 |
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