EP1851022B1 - Method and device for the production of insulation sheets - Google Patents

Method and device for the production of insulation sheets Download PDF

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Publication number
EP1851022B1
EP1851022B1 EP05814930A EP05814930A EP1851022B1 EP 1851022 B1 EP1851022 B1 EP 1851022B1 EP 05814930 A EP05814930 A EP 05814930A EP 05814930 A EP05814930 A EP 05814930A EP 1851022 B1 EP1851022 B1 EP 1851022B1
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Prior art keywords
calibration
fibres
smoothing
nonwoven
stages
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German (de)
French (fr)
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EP1851022A1 (en
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Michael Hoppe
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Grenzebach BSH GmbH
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Grenzebach BSH GmbH
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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
    • 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
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone

Definitions

  • the invention relates to a method for producing insulating panels of fibers according to the preamble of claim 1 and to an apparatus for carrying out the method.
  • a process for producing insulation boards is known in which wood and / or plant particles are cut into a raw material and then glued and dried. From the intermediate material thus obtained, a non-woven is formed by scattering, which is compacted to a desired plate thickness and treated for 10 to 20 seconds with a vapor-air mixture. Care is taken to avoid pre-curing of the binder. Finally, a hot air stream is passed through the compacted web to dry it and cure the binders.
  • the WO 02/122331 describes a method of producing natural fiber plate-like form elements in which natural fibers are mixed with binders and then applied to a forming station. Here, the mixture is molded and steamed, whereby it is solidified. Subsequently, the mixture is pressed, and there is a H hinderluftzinierug the binder.
  • fibers are formed into a mat and the mat is formed into a plate in a first press.
  • the plate is machined with an abrasive tool and finally reshaped in a second press.
  • the plates are unsuitable as an insulating material; the process is discontinuous.
  • Fibers in the context of this invention are all fibrous materials suitable for the manufacture of insulation boards such as e.g. Glass wool, rock wool, plastic fibers, wood fibers, paper fibers, flax, wool and cotton, singly or mixed.
  • binder comprises a single suitable substance or a mixture of several substances. Suitable substances are liquid, powdery or fibrous and consist for example of resin or plastic.
  • the object of the invention is to provide a method for producing insulating panels made of fibers, can be driven in the case of larger amounts of air and in which a device can be designed correspondingly smaller. Another object is to provide a device for carrying out the method.
  • the first object is solved by the features of claim 1.
  • the molding of the insulation boards is divided into two stages.
  • Each of the stages comprises calibrating and fixing a fiber-binder mixture, wherein the height of the mixture in the first of the stages is greater than in the second.
  • a suitable gas e.g. heated air
  • the first stage is designed so that the binders are only partially effective.
  • the greater amount of air in the first stage causes, due to the higher flow rate in connection with incomplete fixation, e.g. entrain short fibers and / or very loose parts of the mixture (with relatively little mass per volume) are compressed.
  • the upper surface of the web in the first stage can be uneven, that is, it can be indentations on the surface.
  • Milling according to claim 2 causes protruding material is removed from the surface and entered into the recesses.
  • the finished insulation board is generally homogeneous and their surface smoother.
  • the thickness ratios according to claim 3 provide a structure of the mixture which is well permeable to air and therefore allows a high speed of the heat treatment agent in the mixture, without the structure of the finished insulating panels is adversely affected. This is to be seen in particular in connection with the speed range according to claim 4 for the heat treatment agent.
  • the temperature according to claim 5 and the residence time according to claim 6 ensure the full function of the binder and optionally the drying of the mixture by utilizing the best possible performance, without damaging the fibers and / or the binder.
  • a device for producing insulating panels comprises a horizontal, endless conveyor belt 1, which is guided on the input side, in the figure left end and at the output end to each a deflection roller 2.
  • One of the guide rollers 2 is connected to a drive.
  • a scattering device 3 is arranged for a fiber-binder mixture, which is connected to a mixing station, not shown.
  • adjustable strips 4 are attached to limit the width of the insulating panels directly above the belt.
  • a housing 6 is arranged so that it encloses the conveyor belt 1 in a region between the guide rollers 2.
  • two stages 7, 8 are arranged for forming the insulating panels.
  • Each of the stages 7, 8 comprises an endless Kalibrierband 9, 11, which is parallel to the conveyor belt 1 or alternatively wedge-shaped and guided around rollers 10, 12.
  • a heat treatment agent e.g. heated air arranged.
  • the first stage 7 begins immediately behind the entrance of the housing 6 and ends shortly before the center of the housing 6.
  • the length of the first stage 7 is 5 to 50% of the length of the housing 6.
  • the distance of a first lower run 9a of the first 9 Kalibrierbands Upper strand 1a of the conveyor belt 1 is adjustable over the first rollers 10.
  • One of the first rollers 10 is connected to a drive.
  • the second stage 9 begins shortly behind the center of the housing 6 and ends at the outlet of the housing 6.
  • the length of the second stage 9 is 40 to 95% of the length of the housing 6.
  • the distance of a second lower run 11 a of the first Kalibrierbands 11 to the upper strand 1 a of the conveyor belt 1 is adjustable via the second rollers 12.
  • One of the second rollers 12 is connected to a drive.
  • a smoothing device in the form of a smoothing roller 13 is arranged vertically adjustable over the width of the conveyor belt 1.
  • the smoothing roller 13 is connected to a drive.
  • She has a roughened coat; alternatively, e.g. Sprockets or radially projecting pins distributed over the shell arranged.
  • the smoothing device extends over 0 to 10% of the length of the housing 6.
  • a cooling device and furthermore a cutting device are arranged behind the rear deflecting roller 2 (not shown).
  • the conveyor belt 1 and the calibration belts 9, 11 are permeable to air and e.g. designed as a screen belts. They have an at least approximately the same width.
  • fibers are mixed in the mixing station and as binder plastic fibers in a suitable ratio to the fiber-binder mixture and conveyed continuously to the scattering device 3.
  • the spread corresponds approximately to the desired width of the insulation boards; whose width is further determined by the strips 4.
  • the fleece is transported in the direction of the arrow 5 in the housing 6 and thus in the first stage 7 and precompressed by means of the first Kalibrierbands 9 to a first thickness.
  • the first thickness corresponds to 0.8 to 2.0 times, in particular 1.1 to 1.6 times, the nominal thickness of the insulation boards.
  • the first calibration belt 9 is driven at a speed approximately the same as the conveyor belt 1 so that the first lower run 9a runs in the same direction as the web.
  • the precompressed web is flowed through by heated air from top to bottom and in this way partially solidified by the binder is partially activated.
  • the air has a relatively high speed in comparison with the known methods, so that irregularities in the form of indentations may occur on the upper surface of the nonwoven.
  • the smoothing roller 13 is driven in the same direction with the transport direction of the web.
  • the smoothing roller 13 is driven in opposite directions.
  • the height of the smoothing roller 13 is set so that its lowest boundary between the height position of the first lower run 9a and the second lower run 11a is arranged.
  • the distance of the lowest boundary to the upper strand 1a of the conveyor belt 1 is 0.9 to 1.9 times, in particular 1.2 to 1.6 times the target thickness of the insulating panels.
  • the precompressed nonwoven enters the second stage 8, where it is compressed by means of the second Kalibrierbandes 11 to the desired thickness of the insulating panels and is flowed through by heated air from top to bottom.
  • the binder is fully activated.
  • both stages 7, 8 the air is circulated in a known manner.
  • the air is sucked out of a room below the upper run 1a by a blower separately for each stage 7, 8, heated after the blower in a heat exchanger and further passed through nozzle boxes on the surface of the mat.
  • the web After solidification, the web can be cooled before being cut into sheets in a cutter.
  • the operating conditions for the production depend on the mixture used and the desired thickness of the insulating panels.
  • the air velocity through the web is 0.1 to 1.5 m / s.
  • the residence time in each stage 7, 8 is 1 to 10 min, based on the thickness of the insulating panels in particular 0.25 to 0.75 min / 10mm.
  • the temperature of the heated air is greater than 100 ° C, in particular 130 ° to 160 ° C.
  • the pressure difference of the air between the space above and the space below the web is up to 180 mmWS, preferably 30 to 100 mmWS.
  • the finished insulation boards have a thickness of 5 to 200 mm.
  • FIG. 2 In an alternative embodiment according to FIG. 2 is arranged as a smoothing plate 14. It is inclined in the transport direction falling.
  • the conveyor belt 1 facing surface of the sheet 14 is rough and / or provided with short pins.
  • the sheet metal can be connected to a drive, which oscillates it during operation.

Abstract

On production of insulation sheets, care must be taken to ensure the velocity of the processing gas remains low, as otherwise mixing within the still unhardened fibres or thickness differences can occur. The devices must be correspondingly large. According to the invention, said disadvantage is overcome, whereby the shaping of the fibres occurs in two stages (7, 8), each stage (7, 8) comprising gauging and fixing and the upper surface of the partly fixed fibres are smoothed between stages (7, 8).

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Dämmstoffplatten aus Fasern gemäß dem Oberbegriff des Anspruchs 1 sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for producing insulating panels of fibers according to the preamble of claim 1 and to an apparatus for carrying out the method.

Aus der DE 196 35 410 A1 ist ein Verfahren zum Herstellen von Dämmplatten bekannt, bei dem Holz- und/oder Pflanzenpartikel zu einem Rohmaterial zerspant und dann beleimt und getrocknet werden. Aus dem so gewonnenen Zwischenmaterial wird durch Streuen ein Vlies gebildet, das auf eine gewünschte Plattenstärke verdichtet und für 10 bis 20 Sekunden mit einem Dampf-Luft-Gemisch behandelt wird. Hierbei wird darauf geachtet, dass ein Voraushärten des Bindemittels vermieden wird. Schließlich wird durch das verdichtete Vlies ein Heißluftstrom geleitet, um es zu trocknen und die Bindemittel auszuhärten.From the DE 196 35 410 A1 For example, a process for producing insulation boards is known in which wood and / or plant particles are cut into a raw material and then glued and dried. From the intermediate material thus obtained, a non-woven is formed by scattering, which is compacted to a desired plate thickness and treated for 10 to 20 seconds with a vapor-air mixture. Care is taken to avoid pre-curing of the binder. Finally, a hot air stream is passed through the compacted web to dry it and cure the binders.

Die WO 02122331 beschreibt ein Verfahren zum Herstellen von plattenförmigen Formelementen auf Naturfaserbasis, bei dem Naturfasern mit Bindemitteln vermischt und dann auf einer Formstation ausgebracht werden. Hier wird das Gemisch ausgeformt und gedämpft, wobei es verfestigt wird. Anschließend wird das Gemisch gepresst, und es erfolgt eine Heißluftaktivierug der Bindemittel.The WO 02/122331 describes a method of producing natural fiber plate-like form elements in which natural fibers are mixed with binders and then applied to a forming station. Here, the mixture is molded and steamed, whereby it is solidified. Subsequently, the mixture is pressed, and there is a Heißluftaktivierug the binder.

Diese bekannten Verfahren sind einstufig, das heißt, das Faser- Bindemittel- Gemisch wird einmal kalibriert, und anschließend werden die Bindemittel aktiviert und/oder gehärtet. Dies hat-den Nachteil, dass die Geschwindigkeit des Gases für die Aktivierung und/oder Härtung niedrig sein muss, damit das lockere Gefüge des Gemisches erhalten bleibt und keine Unebenheiten der Oberfläche entstehen. Andererseits ist die maximale Temperatur des Gases durch das Material der Fasern und der Bindemittel begrenzt, so dass eine Verbesserung der Produktivität durch Temperaturerhöhung nicht möglich ist. Daher muss eine Vorrichtung zum Herstellen von Dämmstoffplatten relativ groß ausgelegt werden, damit die Wirksamkeit der Bindemittel voll erreicht wird und gegebenenfalls unerwünschte Feuchtigkeit verdampft werden kann.These known methods are one-step, that is, the fiber-binder mixture is calibrated once, and then the binders are activated and / or cured. This has the disadvantage that the speed of the gas for activation and / or curing must be low so that the loose structure of the mixture is maintained and no surface unevenness occurs. On the other hand, the maximum temperature of the gas is limited by the material of the fibers and the binder, so that an improvement in productivity by increasing the temperature is not possible. Therefore, an apparatus for producing insulating panels must be made relatively large so that the effectiveness of the binder is fully achieved and, where appropriate, undesirable moisture can be evaporated.

Aus der US 2004/0213987 A1 ist ein Verfahren zur Herstellung von Faserplatten mit konturierten Oberflächen bekannt Hierbei werden Fasern zu einer Matte geformt und die Matte in einer ersten Presse zu einer Platte geformt. Die Platte wird mit einem abtragenden Werkzeug bearbeitet und schließlich in einer zweiten Presse erneut geformt. Die Platten sind als Dämmstoff ungeeignet; das Verfahren ist diskontinuierlich.From the US 2004/0213987 A1 Here, fibers are formed into a mat and the mat is formed into a plate in a first press. The plate is machined with an abrasive tool and finally reshaped in a second press. The plates are unsuitable as an insulating material; the process is discontinuous.

Aus der GB-C 1401900 ist ein zweistufiges Verfahren zur Herstellung von Faserplatten entsprechend dem Oberbegriff des Anspruchs 1 bekannt.From the GB-C 1401900 a two-stage process for the production of fiberboard according to the preamble of claim 1 is known.

Fasern im Sinn dieser Erfindung sind alle für das Herstellen von Dämmstoffplatten geeigneten faserartigen Materialien wie z.B. Glaswolle, Steinwolle, Kunststofffasern, Holzfasern, Papierfasern, Flachs, Wolle und Baumwolle, einzeln oder gemischt.Fibers in the context of this invention are all fibrous materials suitable for the manufacture of insulation boards such as e.g. Glass wool, rock wool, plastic fibers, wood fibers, paper fibers, flax, wool and cotton, singly or mixed.

Der Begriff Bindemittel umfasst einen einzelnen geeigneten Stoff oder eine Mischung mehrerer Stoffe. Geeignete Stoffe sind flüssig, pulver- oder faserförmig und bestehen z.B. aus Harz oder Kunststoff.The term binder comprises a single suitable substance or a mixture of several substances. Suitable substances are liquid, powdery or fibrous and consist for example of resin or plastic.

Aufgabe der Erfindung ist es, ein Verfahren zum Herstellen von Dämmstoffplatten aus Fasern zur Verfügung zu stellen, bei dem mit größeren Luftmengen gefahren werden kann und bei dem eine Vorrichtung entsprechend kleiner ausgelegt sein kann. Eine weitere Aufgabe besteht in der Bereitstellung einer Vorrichtung zur Durchführung des Verfahrens.The object of the invention is to provide a method for producing insulating panels made of fibers, can be driven in the case of larger amounts of air and in which a device can be designed correspondingly smaller. Another object is to provide a device for carrying out the method.

Die erste Aufgabe ist durch die Merkmale des Anspruchs 1 gelöst. Das Formen der Dämmstoffplatten ist in zwei Stufen aufgeteilt. Jede der Stufen umfasst ein Kalibrieren und ein Fixieren eines Faser- Bindemittel- Gemisches, wobei die Höhe des Gemisches in der ersten der Stufen größer ist als in der zweiten. In jeder der Stufen wird ein geeignetes Gas, z.B. erhitzte Luft, zum Fixieren der Bindemittel von oben nach unten durch das Gemisch geleitet. Hierbei ist die erste Stufe so ausgelegt, dass die Bindemittel nur zum Teil wirksam werden. Diese Maßnahmen bewirken, dass das Fixieren in jeder der Stufen mit einer größeren Luftmenge erfolgen kann, wodurch sie wesentlich kleiner dimensioniert werden können als die bekannten Vorrichtungen oder eine entsprechend höhere Kapazität aufweisen.The first object is solved by the features of claim 1. The molding of the insulation boards is divided into two stages. Each of the stages comprises calibrating and fixing a fiber-binder mixture, wherein the height of the mixture in the first of the stages is greater than in the second. In each of the stages, a suitable gas, e.g. heated air, for fixing the binder passed from top to bottom through the mixture. Here, the first stage is designed so that the binders are only partially effective. These measures cause the fixing in each of the stages can be done with a larger amount of air, whereby they can be dimensioned much smaller than the known devices or have a correspondingly higher capacity.

Die größere Luftmenge in der ersten Stufe verursacht infolge der höheren DurchströmungsGeschwindigkeit in Verbindung mit einer nur unvollständigen Fixierung, dass z.B. kurze Fasern mitgerissen und/oder sehr lockere Stellen des Gemisches (mit relativ wenig Masse pro Volumen) verdichtet werden. Hierdurch kann die obere Fläche des Vlieses in der ersten Stufe uneben werden, das heißt, es können Einbuchtungen auf der Oberfläche entstehen. Diese Unebenheiten werden durch das Glätten, das zwischen den Stufen durchgeführt wird, und durch das zweite Kalibrieren ausgeglichen, so dass am Ende des Verfahrens eine Dämmstoffmatte mit den geforderten Eigenschaften zur Verfügung steht.The greater amount of air in the first stage causes, due to the higher flow rate in connection with incomplete fixation, e.g. entrain short fibers and / or very loose parts of the mixture (with relatively little mass per volume) are compressed. In this way, the upper surface of the web in the first stage can be uneven, that is, it can be indentations on the surface. These unevennesses are compensated by the smoothing that is carried out between the steps and by the second calibration, so that at the end of the process an insulation mat with the required properties is available.

Entsprechendes gilt für die zweite Aufgabe, die durch die Merkmale des Anspruchs 7 gelöst ist.The same applies to the second object, which is solved by the features of claim 7.

Die Unteransprüche betreffen die vorteilhafte Ausgestaltung der Erfindung.The subclaims relate to the advantageous embodiment of the invention.

Fräsen nach Anspruch 2 bewirkt, dass überstehendes Material von der Oberfläche abgetragen und in die Einbuchtungen eingetragen wird. Hierdurch wird die fertige Dämmstoffplatte insgesamt homogener und ihre Oberfläche glatter.Milling according to claim 2 causes protruding material is removed from the surface and entered into the recesses. As a result, the finished insulation board is generally homogeneous and their surface smoother.

Die Dickenverhältnisse nach Anspruch 3 ergeben eine Struktur des Gemisches, die gut luftdurchlässig ist und daher eine hohe Geschwindigkeit des Wärmebehandlungsmittels im Gemisch erlaubt, ohne dass die Struktur der fertigen Dämmstoffplatten nachteilig verändert wird. Dies ist insbesondere im Zusammenhang mit dem Geschwindigkeitsbereich nach Anspruch 4 für das Wärmebehandlungsmittel zu sehen.The thickness ratios according to claim 3 provide a structure of the mixture which is well permeable to air and therefore allows a high speed of the heat treatment agent in the mixture, without the structure of the finished insulating panels is adversely affected. This is to be seen in particular in connection with the speed range according to claim 4 for the heat treatment agent.

Die Temperatur nach Anspruch 5 und die Aufenthaltszeit nach Anspruch 6 gewährleisten die volle Funktion des Bindemittels und gegebenenfalls die Trocknung des Gemisches unter Ausnutzung der bestmöglichen Leistung, ohne dass die Fasern und/oder das Bindemittel geschädigt werden.The temperature according to claim 5 and the residence time according to claim 6 ensure the full function of the binder and optionally the drying of the mixture by utilizing the best possible performance, without damaging the fibers and / or the binder.

Die Erfindung wird anhand des in der Zeichnung schematisch dargestellten Ausführungsbeispiels weiter erläutert. Es zeigen

  • Figur 1 einen Längsschnitt durch eine erfindungsgemäße Vorrichtung und
  • Figur 2 eine alternative Glättvorrichtung.
The invention will be further explained with reference to the embodiment shown schematically in the drawing. Show it
  • FIG. 1 a longitudinal section through a device according to the invention and
  • FIG. 2 an alternative smoothing device.

Wie aus Figur 1 ersichtlich umfasst eine Vorrichtung zum Herstellen von Dämmstoffplatten ein horizontales, endloses Transportband 1, das am eingangsseitigen, in der Figur linken Ende und am ausgangsseitigen Ende um jeweils eine Umlenkwalze 2 geführt ist. Eine der Umlenkwalzen 2 ist mit einem Antrieb verbunden.How out FIG. 1 a device for producing insulating panels comprises a horizontal, endless conveyor belt 1, which is guided on the input side, in the figure left end and at the output end to each a deflection roller 2. One of the guide rollers 2 is connected to a drive.

Über dem eingangsseitigen Ende des Transportbands 1 ist eine Streuvorrichtung 3 für ein Faser- Bindemittel- Gemisch angeordnet, die mit einer nicht dargestellten Mischstation verbunden ist. Unter der Streuvorrichtung 3 sind unmittelbar über dem Band verstellbare Leisten 4 zum Begrenzen der Breite der Dämmstoffplatten befestigt.About the input side end of the conveyor belt 1, a scattering device 3 is arranged for a fiber-binder mixture, which is connected to a mixing station, not shown. Under the spreader 3 adjustable strips 4 are attached to limit the width of the insulating panels directly above the belt.

In Transportrichtung gemäß Pfeil 5, auf die sich im Folgenden Richtungsangaben beziehen, hinter der Streuvorrichtung 3 ist ein Gehäuse 6 so angeordnet, dass es das Transportband 1 in einem Bereich zwischen den Umlenkwalzen 2 umschließt. Innerhalb des Gehäuses 6 sind zwei Stufen 7, 8 zum Formen der Dämmstoffplatten angeordnet. Jede der Stufen 7, 8 umfasst ein endloses Kalibrierband 9, 11, das parallel zum Transportband 1 oder alternativ keilförmig ausgerichtet und um Walzen 10, 12 geführt ist. Weiterhin sind für jede Stufe 7, 8 nicht dargestellte Mittel zum Umwälzen von einem Wärmebehandlungsmittel, z.B. erhitzter Luft angeordnet.In the transport direction according to arrow 5, to which directional data refer in the following, behind the scattering device 3, a housing 6 is arranged so that it encloses the conveyor belt 1 in a region between the guide rollers 2. Within the housing 6, two stages 7, 8 are arranged for forming the insulating panels. Each of the stages 7, 8 comprises an endless Kalibrierband 9, 11, which is parallel to the conveyor belt 1 or alternatively wedge-shaped and guided around rollers 10, 12. Furthermore, for each stage 7, 8 means not shown for circulating a heat treatment agent, e.g. heated air arranged.

Die erste Stufe 7 beginnt unmittelbar hinter dem Eingang des Gehäuses 6 und endet kurz vor der Mitte des Gehäuses 6. Die Länge der ersten Stufe 7 beträgt 5 bis 50 % der Länge des Gehäuses 6. Der Abstand eines ersten Untertrums 9a des ersten Kalibrierbands 9 zum Obertrum 1a des Transportbands 1 ist über die ersten Walzen 10 einstellbar. Eine der ersten Walzen 10 ist mit einem Antrieb verbunden.The first stage 7 begins immediately behind the entrance of the housing 6 and ends shortly before the center of the housing 6. The length of the first stage 7 is 5 to 50% of the length of the housing 6. The distance of a first lower run 9a of the first 9 Kalibrierbands Upper strand 1a of the conveyor belt 1 is adjustable over the first rollers 10. One of the first rollers 10 is connected to a drive.

Die zweite Stufe 9 beginnt kurz hinter der Mitte des Gehäuses 6 und endet am Ausgang des Gehäuses 6. Die Länge der zweiten Stufe 9 beträgt 40 bis 95 % der Länge des Gehäuses 6. Der Abstand eines zweiten Untertrums 11 a des ersten Kalibrierbands 11 zum Obertrum 1 a des Transportbands 1 ist über die zweiten Walzen 12 einstellbar. Eine der zweiten Walzen 12 ist mit einem Antrieb verbunden.The second stage 9 begins shortly behind the center of the housing 6 and ends at the outlet of the housing 6. The length of the second stage 9 is 40 to 95% of the length of the housing 6. The distance of a second lower run 11 a of the first Kalibrierbands 11 to the upper strand 1 a of the conveyor belt 1 is adjustable via the second rollers 12. One of the second rollers 12 is connected to a drive.

Zwischen den Kalibrierbändern 9, 11 ist über die Breite des Transportbands 1 eine Glättvorrichtung in Form einer Glättwalze 13 höhenverstellbar angeordnet. Die Glättwalze 13 ist mit einem Antrieb verbunden. Sie weist einen gerauhten Mantel auf; alternativ sind z.B. über den Mantel verteilt Zahnscheiben oder radial abstehende Stifte angeordnet. Die Glättvorrichtung erstreckt sich über 0 bis 10 % der Länge des Gehäuses 6.Between the Kalibrierbändern 9, 11, a smoothing device in the form of a smoothing roller 13 is arranged vertically adjustable over the width of the conveyor belt 1. The smoothing roller 13 is connected to a drive. She has a roughened coat; alternatively, e.g. Sprockets or radially projecting pins distributed over the shell arranged. The smoothing device extends over 0 to 10% of the length of the housing 6.

Hinter der hinteren Umlenkwalze 2 ist bei Bedarf eine Kühlvorrichtung und weiterhin eine Schneidvorrichtung angeordnet (nicht dargestellt).If required, a cooling device and furthermore a cutting device are arranged behind the rear deflecting roller 2 (not shown).

Das Transportband 1 und die Kalibrierbänder 9, 11 sind luftdurchlässig und z.B. als Siebbänder ausgebildet. Sie weisen eine zumindest annähernd gleiche Breite auf.The conveyor belt 1 and the calibration belts 9, 11 are permeable to air and e.g. designed as a screen belts. They have an at least approximately the same width.

Im Betrieb werden in der Mischstation Fasern und als Bindemittel Kunststofffasern in einem geeigneten Verhältnis zu dem Faser- Bindemittel- Gemisch vermischt und kontinuierlich zu der Streuvorrichtung 3 gefördert. Diese verstreut das Gemisch weitgehend gleichmäßig auf das durchlaufende Transportband 1, so dass ein Vlies mit vorwählbarem Flächengewicht entsteht. Die Streubreite entspricht in etwa der Soll- Breite der Dämmstoffplatten; deren Breite wird weiter durch die Leisten 4 festgelegt.In operation, fibers are mixed in the mixing station and as binder plastic fibers in a suitable ratio to the fiber-binder mixture and conveyed continuously to the scattering device 3. This scatters the mixture largely uniformly on the continuous conveyor belt 1, so that a nonwoven fabric with preselectable basis weight arises. The spread corresponds approximately to the desired width of the insulation boards; whose width is further determined by the strips 4.

Das Vlies wird in Richtung des Pfeils 5 in das Gehäuse 6 und somit in die erste Stufe 7 transportiert und mit Hilfe des ersten Kalibrierbands 9 auf eine erste Dicke vorverdichtet. Die erste Dicke entspricht dem 0,8 bis 2,0- fachem, insbesondere dem 1,1 bis 1,6- fachem der Solldicke der Dämmstoffplatten. Das erste Kalibrierband 9 wird mit einer annähernd gleichen Geschwindigkeit wie das Transportband 1 so angetrieben, dass der erste Untertrum 9a in die selbe Richtung läuft wie das Vlies. In der ersten Stufe 7 wird das vorverdichtete Vlies von erhitzter Luft von oben nach unten durchströmt und auf diese Weise teilweise verfestigt, indem das Bindemittel teilweise aktiviert wird. Die Luft hat im Vergleich zu den bekannten Verfahren eine relativ hohe Geschwindigkeit, so dass auf der oberen Fläche des Vlieses Unregelmäßigkeiten in Form von Einbuchtungen entstehen können.The fleece is transported in the direction of the arrow 5 in the housing 6 and thus in the first stage 7 and precompressed by means of the first Kalibrierbands 9 to a first thickness. The first thickness corresponds to 0.8 to 2.0 times, in particular 1.1 to 1.6 times, the nominal thickness of the insulation boards. The first calibration belt 9 is driven at a speed approximately the same as the conveyor belt 1 so that the first lower run 9a runs in the same direction as the web. In the first stage 7, the precompressed web is flowed through by heated air from top to bottom and in this way partially solidified by the binder is partially activated. The air has a relatively high speed in comparison with the known methods, so that irregularities in the form of indentations may occur on the upper surface of the nonwoven.

Diese Unregelmäßigkeiten werden von der Glättwalze 13 ausgeglichen, indem diese Fasern von den höheren Stellen der oberen Fläche abträgt und in den Einbuchtungen einlagert. Hierfür ist die Glättwalze 13 gleichsinnig mit der Transportrichtung des Vlieses angetrieben. Alternativ ist die Glättwalze 13 gegensinnig angetrieben. Die Höhe der Glättwalze 13 so eingestellt, dass deren unterste Begrenzung zwischen der Höhenlage des ersten Untertrums 9a und des zweiten Untertrums 11a angeordnet ist. Der Abstand der untersten Begrenzung zum Obertrum 1a des Transportbands 1 beträgt das 0,9 bis 1,9- fache, insbesondere das 1,2 bis 1,6- fache der Solldicke der Dämmstoffplatten.These irregularities are compensated by the smoothing roll 13, by these fibers from the higher places of the upper surface removes and stores in the indentations. For this purpose, the smoothing roller 13 is driven in the same direction with the transport direction of the web. Alternatively, the smoothing roller 13 is driven in opposite directions. The height of the smoothing roller 13 is set so that its lowest boundary between the height position of the first lower run 9a and the second lower run 11a is arranged. The distance of the lowest boundary to the upper strand 1a of the conveyor belt 1 is 0.9 to 1.9 times, in particular 1.2 to 1.6 times the target thickness of the insulating panels.

Nach der Glättwalze 13 tritt das vorverdichtete Vlies in die zweite Stufe 8 ein, wo es mit Hilfe des zweiten Kalibrierbandes 11 auf die Soll- Dicke der Dämmstoffplatten verdichtet und von erhitzter Luft von oben nach unten durchströmt wird. Hierbei wird das Bindemittel vollständig aktiviert. Auch in der zweiten Stufe 8 sind relativ hohe Geschwindigkeiten der Luft einstellbar, ohne dass Nachteile entstehen, weil das Vlies in der ersten Stufe 7 bereits vorverfestigt wurde.After the smoothing roll 13, the precompressed nonwoven enters the second stage 8, where it is compressed by means of the second Kalibrierbandes 11 to the desired thickness of the insulating panels and is flowed through by heated air from top to bottom. In this case, the binder is fully activated. Even in the second stage 8 relatively high air velocities are adjustable, without causing disadvantages, because the web was already preconsolidated in the first stage 7.

In beiden Stufen 7, 8 wird die Luft auf bekannte Weise im Kreislauf gefahren. Hierfür wird getrennt für jede Stufe 7, 8 die Luft aus einem-Raum unterhalb des Obertrums 1a durch ein Gebläse abgesaugt, nach dem Gebläse in einem Wärmetauscher erhitzt und weiter über Düsenkästen auf die Oberfläche des Vlieses geleitet.In both stages 7, 8, the air is circulated in a known manner. For this purpose, the air is sucked out of a room below the upper run 1a by a blower separately for each stage 7, 8, heated after the blower in a heat exchanger and further passed through nozzle boxes on the surface of the mat.

Nach dem Verfestigen kann das Vlies gekühlt werden, bevor es in einer Schneidvorrichtung zu Platten geschnitten wird.After solidification, the web can be cooled before being cut into sheets in a cutter.

Die Betriebsbedingungen für die Herstellung sind abhängig von dem eingesetzten Gemisch und der Soll- Dicke der Dämmstoffplatten. In beiden Stufen 7, 8 beträgt die Luftgeschwindigkeit durch das Vlies 0,1 bis 1,5 m/s. Die Aufenthaltszeit in jeder Stufe 7, 8 beträgt 1 bis 10 min, auf die Dicke der Dämmstoffplatten bezogen insbesondere 0,25 bis 0,75 min/10mm. Die Temperatur der erhitzten Luft ist größer 100°C, insbesondere 130° bis 160°C. Der Druckunterschied der Luft zwischen dem Raum oberhalb und dem Raum unterhalb des Vlieses beträgt bis 180 mmWS, vorzugsweise 30 bis 100 mmWS.The operating conditions for the production depend on the mixture used and the desired thickness of the insulating panels. In both stages 7, 8, the air velocity through the web is 0.1 to 1.5 m / s. The residence time in each stage 7, 8 is 1 to 10 min, based on the thickness of the insulating panels in particular 0.25 to 0.75 min / 10mm. The temperature of the heated air is greater than 100 ° C, in particular 130 ° to 160 ° C. The pressure difference of the air between the space above and the space below the web is up to 180 mmWS, preferably 30 to 100 mmWS.

Die fertigen Dämmstoffplatten haben eine Dicke von 5 bis 200 mm.The finished insulation boards have a thickness of 5 to 200 mm.

Bei einem alternativen Ausführungsbeispiel nach Figur 2 ist als Glättvorrichtung ein Blech 14 angeordnet. Es ist in Transportrichtung fallend geneigt. Die dem Transportband 1 zugewandte Fläche des Blechs 14 ist rauh und/oder mit kurzen Stiften versehen. Das Blech kann mit einem Antrieb verbunden sein, der es im Betrieb schwingend in Bewegung setzt.In an alternative embodiment according to FIG. 2 is arranged as a smoothing plate 14. It is inclined in the transport direction falling. The conveyor belt 1 facing surface of the sheet 14 is rough and / or provided with short pins. The sheet metal can be connected to a drive, which oscillates it during operation.

Claims (9)

  1. Method for the continuous production of insulating sheets made of fibres, wherein the fibres are mixed with a binding agent, the mixture of fibres and binding agent being applied at a predetermined thickness to a carrying belt (1) to form a nonwoven, then being calibrated to a desired thickness and then fixed by heat treatment and optionally dried, wherein the forking takes place in two stages (7, 8), each of the stages (7, 8) comprising calibration and fixing, characterised in that the upper face of the partially fixed nonwoven is smoothed between the stages (7, 8).
  2. Method according to claim 1, characterised in that milling takes place for smoothing.
  3. Method according to claim 1 or 2, characterised in that a thickness of the nonwoven after the first calibration is 0.8 to 2.0 times a desired thickness and, after the smoothing, is 0.9 to 1.9 times the desired thickness of the insulating sheets.
  4. Method according to any one of claims 1 to 3, characterised in that a speed of a heat treatment agent through the applied mixture is 0.1 to 1.5 m/s.
  5. Method according to any one of claims 1 to 4, characterised in that a temperature of a heat treatment agent is 100° to 180°C.
  6. Method according to any one of claims 1 to 5, characterised in that a residence time in each stage (7, 8) is 0.25 to 0.75 minutes per cm desired thickness.
  7. Device for the continuous production of insulating sheets made of fibres with a drivable transport belt (1), with a scattering device (3), which distributes a mixture of the fibres and a binding agent on the transport belt (1) to form a nonwoven, with at least one calibration belt (9, 11), which is arranged above the transport belt (1), with two calibration belts (9, 11), which are arranged one behind the other in the transport direction, wherein the spacing between a first of the calibration belts (9) and the transport belt (1) is greater than the spacing between a second of the calibration belts (11) and the transport belt (1), characterised in that means are provided to blow heated gas through the calibrated nonwoven, the gas being guided at least partially in the circuit, and in that a smoothing device is arranged between the calibration belts (9, 11).
  8. Device according to claim 7, characterised in that the smoothing device is a roller (13).
  9. Device according to claim 7, characterised in that the smoothing device is a metal sheet (14).
EP05814930A 2005-02-14 2005-12-09 Method and device for the production of insulation sheets Active EP1851022B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005006796A DE102005006796B3 (en) 2005-02-14 2005-02-14 Method and device for producing insulation boards
PCT/EP2005/013192 WO2006084498A1 (en) 2005-02-14 2005-12-09 Method and device for the production of insulation sheets

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EP1851022A1 EP1851022A1 (en) 2007-11-07
EP1851022B1 true EP1851022B1 (en) 2011-02-23

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DE (2) DE102005006796B3 (en)
WO (1) WO2006084498A1 (en)

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DE102020205345B3 (en) 2020-04-28 2021-07-22 Gutex Holzfaserplattenwerk H. Henselmann Gmbh + Co Kg Flexible fiber mat made of wood fibers and bicomponent fibers as a thermoplastic binder as well as a method and device for their production
DE102021004096A1 (en) 2021-08-10 2023-02-16 Hubert Hergeth pulp crusher

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DE2334954A1 (en) * 1972-07-14 1974-01-31 Raimund Jetzer METHOD FOR MANUFACTURING PRESSED PLATES
DE3539364A1 (en) * 1985-11-06 1987-05-14 Fraunhofer Ges Forschung Process for the continuous production of chipboards or fibreboards
DE19635410C2 (en) * 1996-08-31 2003-02-27 Siempelkamp Gmbh & Co Maschine Device for pressing a fleece into a sheet strand
DE10056829C2 (en) * 2000-06-02 2003-09-25 Steico Ag Process for producing an insulation board or mat made of wood fibers and insulation board or mat produced according to this process
DE50015837D1 (en) * 2000-09-13 2010-02-25 Homatherm Ag PLATE-SHAPED FORMING ON NATURAL FIBER BASE AND METHOD FOR THE PRODUCTION THEREOF
US6743318B2 (en) * 2001-11-28 2004-06-01 Masonite Corporation Method of manufacturing consolidated cellulosic panels with contoured surfaces and variable basis weight

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DE502005011013D1 (en) 2011-04-07
ATE499193T1 (en) 2011-03-15
EP1851022A1 (en) 2007-11-07
WO2006084498A1 (en) 2006-08-17

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