EP2179826A1 - Device and method for manufacturing wooden materials - Google Patents

Device and method for manufacturing wooden materials Download PDF

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Publication number
EP2179826A1
EP2179826A1 EP09012440A EP09012440A EP2179826A1 EP 2179826 A1 EP2179826 A1 EP 2179826A1 EP 09012440 A EP09012440 A EP 09012440A EP 09012440 A EP09012440 A EP 09012440A EP 2179826 A1 EP2179826 A1 EP 2179826A1
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EP
European Patent Office
Prior art keywords
transport
products
air flow
adhesive
gluing zone
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Granted
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EP09012440A
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German (de)
French (fr)
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EP2179826B1 (en
Inventor
Axel Siebert
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Kronotec AG
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Kronotec AG
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Priority to PL09012440T priority Critical patent/PL2179826T3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0263—Mixing the material with binding agent by spraying the agent on the falling material, e.g. with the material sliding along an inclined surface, using rotating elements or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit

Definitions

  • the invention relates to a system for carrying out a method for producing wood materials from lignocellulose-containing crushing products with a dryer, the dryer downstream Beleimungs adopted that forms a cylindrical Beleimungszone with a cross-section and is connected to the dryer via a pipe, and a transport pipe, the adjoins the gluing zone.
  • From the EP 1 337 384 is a method for preparing fibers prior to their hot pressing into fiberboard known in which the fibers are first dried to a predetermined residual moisture and then glued. The transport from the dryer to the gluing device takes place via air pressure. The glue is supplied to the dried fibers by atomizing, whereby it attaches in fine droplets on the surface of the fibers. Then the glued fibers over a Connecting pipeline for further processing, for example, directly to a spreader supplied.
  • the gluing zone in the material transport line is formed by an air-permeable inner tube with a pressure-tight outer jacket. In the resulting annular gap compressed air is fed. At the same time, the glue or binder is sprayed through several nozzles and mixed with the fiber stream passing through the inner tube.
  • the invention is therefore based on the object of specifying a method and a plant for the production of wood-based materials, in which the adhesion of glued crushing products from the flow of material in the transport line is avoided.
  • the invention achieves the stated object by a generic method, in which the transport air flow comminution product mixture is mixed with the supply of the adhesive in a rotating or turbulent movement about the transport direction and the mixture envelops the supply of the adhesive from a further air flow parallel to the transport direction becomes.
  • the comminution products are fibrous or span-shaped.
  • the residual moisture to which the comminution products are dried in process step a) is preferably 4 to 6%, based on atro, ie absolutely dry, wood.
  • the residual moisture is advantageously 2 to 4% based on atro-wood.
  • the turbulent movement of the mixture of comminution products and transport air in the gluing zone is advantageously achieved by a high transport speed of the mixture of 25 to 100 m / s. Due to this high speed, the adhesion of already glued crushing products to the inner wall in the gluing zone is furthermore avoided.
  • the turbulent flow is achieved additionally or alternatively to the high speed by increasing the pressure. This also results in less adhesion of already glued crushing products to an inner wall of a pipe.
  • the further air stream which envelops the mixture of glued crushed products and transport air after leaving the gluing zone, is advantageously annular and laminar. In this way, it is ensured that glued shredded products in the transport air flow do not adhere to the inner wall of a transport tube, since they barely come into contact with this inner wall.
  • the further air flow has a temperature which is greater than the temperature of the mixture.
  • a system according to the invention for carrying out a method for producing wood-based materials from lignocellulose-containing comminution products is characterized in that the transport pipe has a larger cross-section than the cylindrical gluing zone and that an annular gap is located between one end of the gluing zone and the transport pipe through which the further air flow can be introduced into the transport pipeline.
  • the end of the gluing zone advantageously opens concentrically in the transport pipeline, so that the annular gap has the same width everywhere. This ensures that the mixture of glued comminution products and transport air leaving the gluing zone in the transport pipeline is uniformly enclosed on all sides by the further air flow.
  • the cross section of the pipe tapers in the transport direction.
  • the fact that the cross-section of the pipeline tapers in the transport direction before the gluing zone increases the speed of the mixture of comminution products and transport air flowing in it.
  • the at least one swirl flap is adjustable by an electric motor. In this way, the twist length of the rotating flow can be adjusted freely.
  • the annular gap is formed so that forms a laminar flow on the inner wall of the transport pipe. This ensures that the mixture of transport air and already glued crushing products does not come into contact with the inner wall of the transport pipe. In particular, there are few vortices and turbulences in the region of the inner wall of the transport pipeline, which can lead to the contact of glued comminution products with the inner wall.
  • comminution products which are introduced via the capsule unit 2 from the dryer 1 into the pipeline 5, are transported via an air flow from a fan 6 to the separator cyclone separator 3. They are dissolved via a tongue 8 in the air stream.
  • a swirl flap 7 is provided with adjusting in the pipe 5 to enable the mixture of transport air and crushing products in rotation can.
  • a uniform cone 14 the flow of crushed products in the pipe 5 is accelerated and fed to a gluing zone 12.
  • the speed of the mixture of transport air and comminuted products is markedly increased by the significantly smaller cross section in the gluing zone 12.
  • the desired speed in the gluing zone 12 is 100 m / s.
  • the necessary length of the gluing zone 12 depends on the desired residence time of the comminution products in the gluing zone 12.
  • a length of the gluing zone 12 has proven advantageous from 3 to 8 times the pipe diameter.
  • gluing zone 12 glue feeds 11, through which the glue or adhesive is mixed with the flying crushing products. This addition takes place, for example, via atomization. Single-fluid nozzles are advantageous since they do without additional air, in particular compressed air.
  • the further air flow is entered via an annular gap 9. This air flow is carried out as ring air, which is advantageous for the entire transport system, since a temperature loss is avoided in the crushing products.
  • the further air flow or the ring air is removed by means of a ring air fan 15 from the sorterzyklonabscheider 3 and returned in a ring air line 16 in the previous process. It is possible to heat this ring air via a heat exchanger 10 and the fan 6 zuzu meeting. Part of the further air flow is cooled by a further heat exchanger 10 and returned as a further air flow through the annular gap 9.
  • the different density of the air at different temperatures advantageously has an effect on the characteristic of the separation property of the further air flow.
  • the amount of the further air flow in the individual partial streams can be regulated by means of adjustment flaps 17.
  • both the liquid pressure and the nozzle shape as well as the shear stress breaks are used by turbulent currents.
  • the gluing zone ends centrally in the transport pipeline 25, where the stream of transport air and glued comminution products is enveloped by the further air stream.
  • FIG. 2 shows the actual gluing device in an enlarged view. It can be clearly seen that the pipe 5 entering from the left is narrowed via the cone 14 to the gluing zone 12. In the gluing zone 12, there is the glue feed 11, via which the glue or adhesive is mixed with the comminuted by-products.
  • the gluing zone 12 ends centrally in the transport pipe 25, in which the transport air stream is enclosed by the further air flow with the crushing products contained therein. The further air flow is introduced through annular gaps 9 from a pressure chamber 13 into the transport pipeline 25.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

The method involves drying the comminution products on a pre-defined residual moisture, and mixing the products with a crushing transport airflow, which has a transport direction. An adhesive is supplied to the air transport-crushing mix products. The transport air-shredding products mixture is placed in the supply of the adhesive in a rotating or turbulent motion to the transport direction. An independent claim is included for a plant for executing a wood products manufacturing method.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Holzwerkstoffen aus lignozellulosehaltigen Zerkleinerungsprodukten, das folgende Schritte umfasst:

  1. a) Trocknen der Zerkleinerungsprodukte auf eine vordefinierte Restfeuchte,
  2. b) Vermischen der Zerkleinerungsprodukte mit einem Transportluftstrom, der eine Transportrichtung aufweist,
  3. c) Zuführen eines Klebstoffs zu dem Transportluftstrom - Zerkleinerungsprodukt-Gemisch, wobei sich der Klebstoff in feinen Tröpfchen oberflächlich an die Zerkleinerungsprodukte anlegt und anhaftet,
  4. d) Verbinden der Zerkleinerungsprodukte unter Druck- und Temperatureinfluss.
The invention relates to a method for producing wood-based materials from lignocellulose-containing comminution products, which comprises the following steps:
  1. a) drying the comminution products to a predefined residual moisture,
  2. b) mixing the shredded products with a transport air stream having a transport direction,
  3. c) supplying an adhesive to the transport air flow - crushed product mixture, wherein the adhesive in fine droplets superimposed on the crushed products and adheres,
  4. d) connecting the shredded products under pressure and temperature influence.

Zudem betrifft die Erfindung eine Anlage zum Durchführen eines Verfahrens zum Herstellen von Holzwerkstoffen aus lignozellulosehaltigen Zerkleinerungsprodukten mit einem Trockner, einer dem Trockner nachgeordneten Beleimungseinrichtung, die eine zylinderförmige Beleimungszone mit einem Querschnitt ausbildet und mit dem Trockner über eine Rohrleitung verbunden ist, und einer Transportrohrleitung, die sich an die Beleimungszone anschließt.In addition, the invention relates to a system for carrying out a method for producing wood materials from lignocellulose-containing crushing products with a dryer, the dryer downstream Beleimungseinrichtung that forms a cylindrical Beleimungszone with a cross-section and is connected to the dryer via a pipe, and a transport pipe, the adjoins the gluing zone.

Aus der EP 1 337 384 ist ein Verfahren zum Aufbereiten von Fasern vor ihrer Heißverpressung zu Faserplatten bekannt, bei dem die Fasern zunächst auf eine vorbestimmte Restfeuchte getrocknet werden und anschließend beleimt werden. Der Transport vom Trockner zur Beleimungseinrichtung erfolgt dabei über Luftdruck. Der Leim wird den getrockneten Fasern durch Bedüsen zugeführt, wodurch er sich in feinen Tröpfchen auf der Oberfläche der Fasern anlagert. Anschließend werden die beleimten Fasern über eine Verbindungsrohrleitung der weiteren Verarbeitung, beispielsweise direkt einer Streumaschine, zugeführt.From the EP 1 337 384 is a method for preparing fibers prior to their hot pressing into fiberboard known in which the fibers are first dried to a predetermined residual moisture and then glued. The transport from the dryer to the gluing device takes place via air pressure. The glue is supplied to the dried fibers by atomizing, whereby it attaches in fine droplets on the surface of the fibers. Then the glued fibers over a Connecting pipeline for further processing, for example, directly to a spreader supplied.

Die Beleimungszone in der Materialtransportleitung wird durch ein luftdurchlässiges Innenrohr mit einem druckdichten Außenmantel gebildet. In den dadurch vorhandenen Ringspalt wird Druckluft eingespeist. Gleichzeitig wird der Leim oder das Bindemittel über mehrere Düsen eingesprüht und mit dem im inneren Rohr hindurchtretenden Faserstrom vermischt.The gluing zone in the material transport line is formed by an air-permeable inner tube with a pressure-tight outer jacket. In the resulting annular gap compressed air is fed. At the same time, the glue or binder is sprayed through several nozzles and mixed with the fiber stream passing through the inner tube.

Nachteilig ist, dass sich der beleimte Faserstrom an die Innenwand der Transportleitung anhaftet, die sich an die Leimbenetzungszone anschließt. Diese Transportleitung wird dadurch verschmutzt und ihr Innendurchmesser wird verringert. Daher müssen derartige Anlagen zur Trockenbeleimung von Zeit zu Zeit stillgelegt und gereinigt werden. Dies hat neben dem erhöhten Wartungs- auch einen erhöhten Kostenaufwand zur Folge.The disadvantage is that the glued fiber stream adheres to the inner wall of the transport line, which adjoins the glue wetting zone. This transport line is thereby polluted and its inner diameter is reduced. Therefore, such systems for dry gluing must be shut down and cleaned from time to time. This has in addition to the increased maintenance and increased costs.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Anlage zum Herstellen von Holzwerkstoffen anzugeben, bei dem das Anhaften beleimter Zerkleinerungsprodukte aus dem Materialstrom in der Transportleitung vermieden wird.The invention is therefore based on the object of specifying a method and a plant for the production of wood-based materials, in which the adhesion of glued crushing products from the flow of material in the transport line is avoided.

Die Erfindung löst die gestellte Aufgabe durch ein gattungsgemäßes Verfahren, bei dem das Transportluftstrom-Zerkleinungsprodukte-Gemisch beim Zuführen des Klebstoffes in eine rotierende oder turbulente Bewegung um die Transportrichtung versetzt wird und das Gemisch nach dem Zuführen des Klebstoffes von einem weiteren Luftstrom parallel zur Transportrichtung umhüllt wird.The invention achieves the stated object by a generic method, in which the transport air flow comminution product mixture is mixed with the supply of the adhesive in a rotating or turbulent movement about the transport direction and the mixture envelops the supply of the adhesive from a further air flow parallel to the transport direction becomes.

In der Beleimungszone, in der dem Gemisch aus Transportluft und Zerkleinerungsprodukten der Klebstoff beigemischt wird, herrscht im erfindungsgemäßen Verfahren entweder eine rotierende laminare Luftströmung oder eine turbulente Luftströmung. Durch beide Strömungsarten wird vermieden, dass sich beleimte Zerkleinerungsprodukte an den Rohrwänden anhaften und diese verschmutzen. Insbesondere bei einer rotierenden laminaren Strömung kann die Dralllänge, also die Strecke in Transportrichtung, die die Luft für eine Umdrehung in Drallrichtung benötigt, frei eingestellt werden. Der Materialstrom der Zerkleinerungsprodukte wird dabei durch seine Trägheit an die Rohraußenwand der Beleimungszone geführt und verhindert somit sicher Anbackungen bzw. beseitigt bereits vorhandene Anhaftungen. Den gleichen Effekt hat eine turbulente Luftströmung, die ebenfalls verhindert, dass beleimte Zerkleinerungsprodukte an der Rohrinnenwand hängen bleiben.In the gluing zone, in which the mixture of transport air and comminuted products is admixed with the adhesive, in the method according to the invention either a rotating laminar air flow or a turbulent air flow prevails. By both types of flow is avoided that glued crushing products adhere to the pipe walls and pollute them. Especially with a rotating laminar Flow, the swirl length, so the distance in the transport direction, which requires the air for a turn in the twisting direction, be set freely. The material flow of the crushed products is guided by its inertia to the tube outer wall of the gluing zone and thus reliably prevents caking or eliminates existing adhesions. A turbulent air flow has the same effect, which also prevents glued shredded products from getting stuck to the inner wall of the pipe.

Nachdem das Gemisch aus beleimten Zerkleinerungsprodukten und Transportluft die Beleimungszone verlassen hat, wird es von einem weiteren Luftstrom parallel zur Transportrichtung umhüllt. Dadurch ist sichergestellt, dass sich auch nach dem Verlassen der Beleimungszone beleimte Zerkleinerungsprodukte nicht an einer Innenwand eines Transportrohres anhaften können. Durch die Ummantelung des Gemisches mit einem weiteren Luftstrom wird ein Kontakt zwischen beleimten Zerkleinerungsprodukten und der Rohrinnenwand weitgehend vermieden.After the mixture of glued comminution products and transport air has left the gluing zone, it is enveloped by another air flow parallel to the transport direction. This ensures that even after leaving the gluing zone glued shredded products can not adhere to an inner wall of a transport tube. By sheathing the mixture with a further air flow, contact between glued crushing products and the tube inner wall is largely avoided.

Vorteilhafterweise sind die Zerkleinerungsprodukte faserförmig oder spanförmig.Advantageously, the comminution products are fibrous or span-shaped.

Bei faserförmigen Zerkleinerungsprodukten beträgt die Restfeuchte, auf die die Zerkleinerungsprodukte im Verfahrenschritt a) getrocknet werden, vorzugsweise 4 bis 6 % bezogen auf atro, also absolut trockenes, Holz. Bei spanförmigen Zerkleinerungsprodukten beträgt die Restfeuchte vorteilhafterweise 2 bis 4 % bezogen auf atro-Holz. Die turbulente Bewegung des Gemisches aus Zerkleinerungsprodukten und Transportluft in der Beleimungszone wird vorteilhafterweise durch eine hohe Transportgeschwindigkeit des Gemisches von 25 bis 100 m/s erreicht. Durch diese hohe Geschwindigkeit wird zudem auch die Anhaftung von bereits beleimten Zerkleinerungsprodukten an der Innenwand in der Beleimungszone weiter vermieden.In the case of fibrous comminution products, the residual moisture to which the comminution products are dried in process step a) is preferably 4 to 6%, based on atro, ie absolutely dry, wood. For chip-shaped crushed products, the residual moisture is advantageously 2 to 4% based on atro-wood. The turbulent movement of the mixture of comminution products and transport air in the gluing zone is advantageously achieved by a high transport speed of the mixture of 25 to 100 m / s. Due to this high speed, the adhesion of already glued crushing products to the inner wall in the gluing zone is furthermore avoided.

Vorteilhafterweise wird die turbulente Strömung zusätzlich oder alternativ zur hohen Geschwindigkeit durch eine Druckerhöhung erreicht. Auch dies hat eine geringere Anhaftung von bereits beleimten Zerkleinerungsprodukten an einer Innenwand eines Rohres zur Folge.Advantageously, the turbulent flow is achieved additionally or alternatively to the high speed by increasing the pressure. This also results in less adhesion of already glued crushing products to an inner wall of a pipe.

Der weitere Luftstrom, der das Gemisch aus beleimten Zerkleinerungsprodukten und Transportluft nach dem Verlassen der Beleimungszone umhüllt, ist vorteilhafterweise ringförmig und laminar. Auf diese Weise wird gewährleistet, dass sich im Transportluftstrom befindende beleimte Zerkleinerungsprodukte nicht an der Innenwand eines Transportrohres anhaften, da sie mit dieser Innenwand kaum noch in Kontakt kommen.The further air stream, which envelops the mixture of glued crushed products and transport air after leaving the gluing zone, is advantageously annular and laminar. In this way, it is ensured that glued shredded products in the transport air flow do not adhere to the inner wall of a transport tube, since they barely come into contact with this inner wall.

Besonders vorteilhafterweise weist der weitere Luftstrom eine Temperatur auf, die größer ist als die Temperatur des Gemisches.Particularly advantageously, the further air flow has a temperature which is greater than the temperature of the mixture.

Eine erfindungsgemäße Anlage zum Durchführen eines Verfahrens zum Herstellen von Holzwerkstoffen aus lignozellulosehaltigen Zerkleinerungsprodukten zeichnet sich dadurch aus, dass die Transportrohrleitung einen größeren Querschnitt als die zylinderförmige Beleimungszone aufweist und dass sich zwischen einem Ende der Beleimungszone und der Transportrohrleitung ein Ringspalt befindet, durch den der weitere Luftstrom in die Transportrohrleitung einbringbar ist.A system according to the invention for carrying out a method for producing wood-based materials from lignocellulose-containing comminution products is characterized in that the transport pipe has a larger cross-section than the cylindrical gluing zone and that an annular gap is located between one end of the gluing zone and the transport pipe through which the further air flow can be introduced into the transport pipeline.

Dabei mündet das Ende der Beleimungszone vorteilhafterweise konzentrisch in der Transportrohrleitung, so dass der Ringspalt überall die gleiche Breite aufweist. Dadurch ist sichergestellt, dass das Gemisch aus beleimten Zerkleinerungsprodukten und Transportluft, das die Beleimungszone in die Transportrohrleitung verlässt, auf allen Seiten gleichmäßig vom weiteren Luftstrom umschlossen wird.In this case, the end of the gluing zone advantageously opens concentrically in the transport pipeline, so that the annular gap has the same width everywhere. This ensures that the mixture of glued comminution products and transport air leaving the gluing zone in the transport pipeline is uniformly enclosed on all sides by the further air flow.

Vorteilhafterweise verjüngt sich der Querschnitt der Rohrleitung in Transportrichtung. Dadurch, dass sich der Querschnitt der Rohrleitung vor der Beleimungszone in Transportrichtung verjüngt, wird die Geschwindigkeit des in ihr strömenden Gemisches aus Zerkleinerungsprodukten und Transportluft erhöht.Advantageously, the cross section of the pipe tapers in the transport direction. The fact that the cross-section of the pipeline tapers in the transport direction before the gluing zone increases the speed of the mixture of comminution products and transport air flowing in it.

In der Rohrleitung befindet sich vorzugsweise wenigstens eine Drallklappe, um einen durch die Rohrleitung strömenden Luftstrom in Rotation zu versetzen. Auf diese Weise wird gewährleistet, dass der Luftstrom in der Beleimungszone rotiert und so Anhaftungen von beleimten Zerkleinerungsprodukten vermieden werden.In the pipeline, there is preferably at least one swirl flap in order to set a stream of air flowing through the pipeline into rotation. This way will ensures that the air stream in the gluing zone rotates, thus avoiding the adhesion of glued crushing products.

Vorzugsweise ist die wenigstens eine Drallklappe elektromotorisch verstellbar. Auf diese Weise kann die Dralllänge der rotierenden Strömung frei eingestellt werden.Preferably, the at least one swirl flap is adjustable by an electric motor. In this way, the twist length of the rotating flow can be adjusted freely.

Vorteilhafterweise ist der Ringspalt so ausgebildet, dass sich an der Innenwand der Transportrohrleitung eine laminare Strömung ausbildet. Dadurch ist gewährleistet, dass das Gemisch aus Transportluft und bereits beleimten Zerkleinerungsprodukten nicht mit der Innenwand der Transportrohrleitung in Kontakt kommt. Insbesondere gibt es im Bereich der Innenwand der Transportrohrleitung wenig Wirbel und Turbulenzen, die zum Kontakt beleimter Zerkleinerungsprodukte mit der Innenwand führen können.Advantageously, the annular gap is formed so that forms a laminar flow on the inner wall of the transport pipe. This ensures that the mixture of transport air and already glued crushing products does not come into contact with the inner wall of the transport pipe. In particular, there are few vortices and turbulences in the region of the inner wall of the transport pipeline, which can lead to the contact of glued comminution products with the inner wall.

Mit Hilfe einer Zeichnung wird ein Ausführungsbeispiel der Erfindung näher beschrieben. Es zeigt:

Figur 1-
eine schematische Teildarstellung eines Ausführungsbeispiels einer erfindungsgemäßen Anlage und
Figur 2-
einen vergrößerten Ausschnitt aus Figur 1.
In Figur 1 ist der Teil einer erfindungsgemäßen Anlage gezeigt, der zum Trocknen der Zerkleinerungsprodukte verwendet wird. Die zu beleimenden Zerkleinerungsprodukte werden zunächst in einem Trockner 1 getrocknet und dann über ein Kapselwerk 2 einer Rohrleitung 5 zugeführt. Die Rohrleitung 5 führt die zu beleimenden Zerkleinerungsprodukte zur Beleimungseinrichtung. Anschließend werden die dann beleimten Zerkleinerungsprodukte
durch die Transportrohrleitung 25 zu einem
Sichterzyklonabscheider 3 und anschließend über ein weiteres Kapselwerk 2 einem Sichter 4 zugeführt.With the aid of a drawing, an embodiment of the invention will be described in more detail. It shows:
Figure 1-
a schematic partial view of an embodiment of a system according to the invention and
FIG. 2
an enlarged section FIG. 1 ,
In FIG. 1 the part of a plant according to the invention is shown, which is used for drying the crushed products. The shredded products to be glued are first dried in a drier 1 and then fed via a capsule unit 2 to a pipeline 5. The pipeline 5 leads the shredded products to be glued to the gluing device. Subsequently, the glued crushed products
through the transport pipe 25 to a
Sichterzyklonabscheider 3 and then fed via a further capsule 2 a classifier 4.

Die Zerkleinerungsprodukte, die über das Kapselwerk 2 vom Trockner 1 in die Rohrleitung 5 eingebracht werden, werden über einen Luftstrom von einem Ventilator 6 zum Sichterzyklonabscheider 3 transportiert. Dabei werden sie über eine Zunge 8 im Luftstrom aufgelöst. Im in Fig. 1 gezeigten Ausführungsbeispiel ist in der Rohrleitung 5 eine Drallklappe 7 mit Verstellvorrichtung vorgesehen, um das Gemisch aus Transportluft und Zerkleinerungsprodukten in Rotation versetzen zu können. Durch einen gleichmäßigen Konus 14 wird der Strom aus Zerkleinerungsprodukten in der Rohrleitung 5 beschleunigt und einer Beleimungszone 12 zugeführt.The comminution products, which are introduced via the capsule unit 2 from the dryer 1 into the pipeline 5, are transported via an air flow from a fan 6 to the separator cyclone separator 3. They are dissolved via a tongue 8 in the air stream. Im in Fig. 1 shown embodiment, a swirl flap 7 is provided with adjusting in the pipe 5 to enable the mixture of transport air and crushing products in rotation can. By a uniform cone 14, the flow of crushed products in the pipe 5 is accelerated and fed to a gluing zone 12.

Vor dem Konus 14 befinden sich in der Rohrleitung 5 nur unbeleimte Zerkleinerungsprodukte. Um hier Anhaftungen an der Rohrleitungswand sicher zu vermeiden, ist eine Luftgeschwindigkeit von 20 bis 25 m/s notwendig.Before the cone 14 are in the pipe 5 only unglued crushed products. In order to safely avoid buildup on the pipe wall, an air velocity of 20 to 25 m / s is necessary.

In der Beleimungszone 12 ist die Geschwindigkeit des Gemisches aus Transportluft und Zerkleinerungsprodukten durch den deutlich kleineren Querschnitt in der Beleimungszone 12 deutlich erhöht. Im vorliegenden Beispiel beträgt die Sollgeschwindigkeit in der Beleimungszone 12 100 m/s. Die notwendige Länge der Beleimungszone 12 richtet sich nach der erwünschten Verweilzeit der Zerkleinerungsprodukte in der Beleimungszone 12. Als vorteilhaft hat sich eine Länge der Beleimungszone 12 vom 3-bis 8-fachen des Rohrdurchmessers herausgestellt.In the gluing zone 12, the speed of the mixture of transport air and comminuted products is markedly increased by the significantly smaller cross section in the gluing zone 12. In the present example, the desired speed in the gluing zone 12 is 100 m / s. The necessary length of the gluing zone 12 depends on the desired residence time of the comminution products in the gluing zone 12. A length of the gluing zone 12 has proven advantageous from 3 to 8 times the pipe diameter.

In der Beleimungszone 12 befinden sich Leimzuführungen 11, über die der Leim oder Klebstoff den durchfliegenden Zerkleinerungsprodukten beigemischt wird. Diese Zugabe erfolgt beispielsweise über eine Verdüsung. Vorteilhaft sind Einstoffdüsen, da diese ohne zusätzliche Luft, insbesondere Pressluft, auskommen. Am Ende der Beleimungszone 12 wird über einen Ringspalt 9 der weitere Luftstrom eingegeben. Dieser Luftstrom wird als Ringluft ausgeführt, was für das gesamte Transportsystem vorteilhaft ist, da ein Temperaturverlust in den Zerkleinerungsprodukten vermieden wird.In the gluing zone 12 are glue feeds 11, through which the glue or adhesive is mixed with the flying crushing products. This addition takes place, for example, via atomization. Single-fluid nozzles are advantageous since they do without additional air, in particular compressed air. At the end of the gluing zone 12, the further air flow is entered via an annular gap 9. This air flow is carried out as ring air, which is advantageous for the entire transport system, since a temperature loss is avoided in the crushing products.

Vorteilhafterweise wird der weitere Luftstrom oder die Ringluft mittels eines Ringluftventilators 15 vom Sichterzyklonabscheider 3 entnommen und in einer Ringluftleitung 16 in den vorherigen Prozess zurückgeführt. Dabei besteht die Möglichkeit, diese Ringluft über einen Wärmetauscher 10 zu erwärmen und dem Ventilator 6 zuzuleiten. Ein Teil des weiteren Luftstromes wird über einen weiteren Wärmetauscher 10 abgekühlt und als weiterer Luftstrom über den Ringspalt 9 zurückgegeben.Advantageously, the further air flow or the ring air is removed by means of a ring air fan 15 from the Sichterzyklonabscheider 3 and returned in a ring air line 16 in the previous process. It is possible to heat this ring air via a heat exchanger 10 and the fan 6 zuzuleiten. Part of the further air flow is cooled by a further heat exchanger 10 and returned as a further air flow through the annular gap 9.

Vorteilhaft wirkt sich dabei insbesondere die unterschiedliche Dichte der Luft bei verschiedenen Temperaturen auf die Ausprägung der Trenneigenschaft des weiteren Luftstroms aus. Die Menge des weiteren Luftstroms in den einzelnen Teilströmen kann mittels Einstellklappen 17 geregelt werden.In this case, the different density of the air at different temperatures advantageously has an effect on the characteristic of the separation property of the further air flow. The amount of the further air flow in the individual partial streams can be regulated by means of adjustment flaps 17.

Für die Verdüsung des Leimes in der Beleimungszone 12 durch die Leimzuführung 11 werden sowohl der Flüssigkeitsdruck und die Düsenform als auch die Scherspannungsabrisse durch turbulente Strömungen benutzt. Im in Figur 1 gezeigten Ausführungsbeispiel endet die Beleimungszone zentrisch in der Transportrohrleitung 25, wo der Strom aus Transportluft und beleimten Zerkleinerungsprodukten vom weiteren Luftstrom ummantelt wird.For the atomization of the glue in the gluing zone 12 by the glue feed 11, both the liquid pressure and the nozzle shape as well as the shear stress breaks are used by turbulent currents. Im in FIG. 1 In the embodiment shown, the gluing zone ends centrally in the transport pipeline 25, where the stream of transport air and glued comminution products is enveloped by the further air stream.

Figur 2 zeigt die eigentliche Beleimungseinrichtung in einer vergrößerten Darstellung. Deutlich zu erkennen ist, dass die von links einlaufende Rohrleitung 5 über den Konus 14 zur Beleimungszone 12 verengt wird. In der Beleimungszone 12 befindet sich die Leimzuführung 11, über die der Leim oder Klebstoff den durchfliegenden Zerkleinerungsprodukten beigemischt wird. Die Beleimungszone 12 endet zentrisch in der Transportrohrleitung 25, in der der Transportluftstrom mit den darin enthaltenen Zerkleinerungsprodukten vom weiteren Luftstrom ummantelt wird. Der weitere Luftstrom wird durch Ringspalten 9 aus einer Druckkammer 13 in die Transportrohrleitung 25 eingeführt. FIG. 2 shows the actual gluing device in an enlarged view. It can be clearly seen that the pipe 5 entering from the left is narrowed via the cone 14 to the gluing zone 12. In the gluing zone 12, there is the glue feed 11, via which the glue or adhesive is mixed with the comminuted by-products. The gluing zone 12 ends centrally in the transport pipe 25, in which the transport air stream is enclosed by the further air flow with the crushing products contained therein. The further air flow is introduced through annular gaps 9 from a pressure chamber 13 into the transport pipeline 25.

Bezugszeichenliste

1
Trockner
2
Kapselwerk
3
Sichterzyklonabscheider
4
Sichter
5
Rohrleitung
6
Ventilator
7
Drallklappe
8
Zunge
9
Ringspalt
10
Wärmetauscher
11
Leimzuführung
12
Beleimungszone
13
Druckkammer
14
Konus
15
Ringluftventilator
16
Ringluftleitung
17
Einstellklappe
25
Transportrohrleitung
LIST OF REFERENCE NUMBERS
1
dryer
2
capsule works
3
Sichterzyklonabscheider
4
sifter
5
pipeline
6
fan
7
swirl flap
8th
tongue
9
annular gap
10
heat exchangers
11
Leimzuführung
12
Beleimungszone
13
pressure chamber
14
cone
15
Ring air fan
16
Ring-air line
17
adjusting flap
25
Transport pipeline

Claims (14)

Verfahren zum Herstellen von Holzwerkstoffen aus lignozellulosehaltigen Zerkleinerungsprodukten, das folgende Schritte umfasst: a) Trocknen der Zerkleinerungsprodukte auf eine vordefinierte Restfeuchte, b) Vermischen der Zerkleinerungsprodukte mit einem Transportluftstrom, der eine Transportrichtung aufweist, c) Zuführen eines Klebstoffes zu dem Transportluftstrom-Zerkleinerungsprodukte-Gemisch, wobei sich der Klebstoff in feinen Tröpfchen oberflächlich an die Zerkleinerungsprodukte anlegt und anhaftet, d) Verbinden der Zerkleinerungsprodukte unter Druck- und Temperatureinfluss, dadurch gekennzeichnet, dass das Transportluftstrom-Zerkleinerungsprodukte-Gemisch beim Zuführen des Klebstoffs in eine rotierende oder turbulente Bewegung um die Transportrichtung versetzt wird und das Gemisch nach dem Zuführen des Klebstoffes von einem weiteren Luftstrom parallel zur Transportrichtung umhüllt wird.Process for producing wood-based materials from lignocellulose-containing comminution products, comprising the following steps: a) drying the comminution products to a predefined residual moisture, b) mixing the shredded products with a transport air stream having a transport direction, c) supplying an adhesive to the transport airflow comminuted product mixture, said adhesive superficially depositing and adhering in fine droplets to the comminution products, d) connecting the shredded products under the influence of pressure and temperature, characterized in that the transport air flow comminuted product mixture is mixed in supplying the adhesive in a rotating or turbulent movement about the transport direction and the mixture is wrapped after supplying the adhesive from a further air flow parallel to the transport direction. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Zerkleinerungsprodukte faserförmig sind.A method according to claim 1, characterized in that the crushed products are fibrous. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die vordefinierte Restfeuchte 4 bis 6 % bezogen auf atro-Holz beträgt.A method according to claim 2, characterized in that the predefined residual moisture is 4 to 6% based on atro-wood. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Zerkleinerungsprodukte spanförmig sind.A method according to claim 1, characterized in that the crushed products are span-shaped. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Restfeuchte 2 bis 4 % bezogen auf atro-Holz beträgt.A method according to claim 4, characterized in that the residual moisture is 2 to 4% based on atro-wood. Verfahren nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die turbulente Bewegung durch eine Geschwindigkeit des Gemisches von 25 bis 100 m/s erreicht wird.Method according to one or more of the preceding claims, characterized in that the turbulent movement is achieved by a speed of the mixture of 25 to 100 m / s. Verfahren nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die turbulente Bewegung durch eine Druckerhöhung erreicht wird.Method according to one or more of the preceding claims, characterized in that the turbulent movement is achieved by an increase in pressure. Verfahren nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der weitere Luftstrom ringförmig und laminar ist.Method according to one or more of the preceding claims, characterized in that the further air flow is annular and laminar. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass der weitere Luftstrom eine Temperatur aufweist, die größer ist als eine Temperatur des Transportluftstrom-Zerkleinerungsprodukte-Gemischs.A method according to claim 8, characterized in that the further air flow has a temperature which is greater than a temperature of the transport air flow-crushed product mixture. Anlage zum Durchführen eines Verfahrens zum Herstellen von Holzwerkstoffen aus lignozellulosehaltigen Zerkleinerungsprodukten mit einem Trockner (1), einer dem Trockner (1) nachgeordneten Beleimungseinrichtung, die eine zylinderförmige Beleimungszone (12) mit einem Querschnitt ausbildet und mit dem Trockner (1) über eine Rohrleitung (5) verbunden ist, und einer Transportrohrleitung (25), die sich an die Beleimungszone (12) anschließt, dadurch gekennzeichnet, dass die Transportrohrleitung (25) einen größeren Querschnitt als die zylinderförmige Beleimungszone (12) aufweist und sich zwischen dem Ende der Beleimungszone (12) und der Transportrohrleitung (25) ein Ringspalt (9) befindet, durch den ein weiterer Luftstrom in die Transportrohrleitung (25) einbringbar ist.Installation for carrying out a method for producing wood-based materials from lignocellulose-containing comminution products with a dryer (1), a gluing device downstream of the dryer (1), which forms a cylindrical gluing zone (12) with a cross-section and with the dryer (1) via a pipeline ( 5), and a transport pipe (25) which adjoins the gluing zone (12), characterized in that the transport pipe (25) has a larger cross section than the cylindrical gluing zone (12) and extends between the end of the gluing zone (12). 12) and the transport pipe (25) is an annular gap (9) through which a further air flow in the transport pipe (25) can be introduced. Anlage nach Anspruch 10, dadurch gekennzeichnet, dass sich der Querschnitt der Rohrleitung (5) in Transportrichtung verjüngt.Installation according to claim 10, characterized in that the cross section of the pipe (5) tapers in the transport direction. Anlage nach Anspruch 11, dadurch gekennzeichnet, dass sich in der Rohrleitung (5) wenigstens eine Drallklappe (7) befindet, um einen durch die Rohrleitung (5) strömenden Luftstrom in Rotation zu versetzen.Plant according to Claim 11, characterized in that at least one swirl flap (7) is located in the pipeline (5) in order to set a stream of air flowing through the pipeline (5) into rotation. Anlage nach Anspruch 12, dadurch gekennzeichnet, dass die wenigstens eine Drallklappe (7) elektromotisch verstellbar ist.Plant according to claim 12, characterized in that the at least one swirl flap (7) is electromotively adjustable. Anlage nach einem oder mehreren der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass der Ringspalt (9) so ausgebildet ist, dass sich an einer Innenwand der Transportrohrleitung (25) eine laminare Luftströmung ausbildet.Installation according to one or more of claims 10 to 13, characterized in that the annular gap (9) is formed so that an laminar air flow is formed on an inner wall of the transport pipe (25).
EP09012440.5A 2008-10-23 2009-10-01 Device for manufacturing wooden materials Active EP2179826B1 (en)

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ES (1) ES2511846T3 (en)
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AT522983A1 (en) * 2019-09-30 2021-04-15 Andritz Ag Maschf SYSTEM AND METHOD FOR APPLYING GLUE TO A FIBER FIBER

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EP0745463A2 (en) * 1995-06-02 1996-12-04 Medite Corporation Method and apparatus for reducing blowline obstructions during production of cellulosic composites
EP1337384A1 (en) 2000-12-01 2003-08-27 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Fibre preparation system
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Publication number Priority date Publication date Assignee Title
AT522983A1 (en) * 2019-09-30 2021-04-15 Andritz Ag Maschf SYSTEM AND METHOD FOR APPLYING GLUE TO A FIBER FIBER
AT522983B1 (en) * 2019-09-30 2022-12-15 Andritz Ag Maschf PLANT AND PROCESS FOR APPLYING GLUES TO A FABRIC

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PT2179826E (en) 2014-10-30
DE102008052961A1 (en) 2010-05-27
ES2511846T3 (en) 2014-10-23
PL2179826T3 (en) 2015-01-30
DE102008052961B4 (en) 2016-07-28
EP2179826B1 (en) 2014-09-10

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