EP0078960A1 - Method and device for glueing particles, especially wood-shavings - Google Patents

Method and device for glueing particles, especially wood-shavings Download PDF

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Publication number
EP0078960A1
EP0078960A1 EP82109799A EP82109799A EP0078960A1 EP 0078960 A1 EP0078960 A1 EP 0078960A1 EP 82109799 A EP82109799 A EP 82109799A EP 82109799 A EP82109799 A EP 82109799A EP 0078960 A1 EP0078960 A1 EP 0078960A1
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Prior art keywords
glue
pneumatic
conveying
chips
gluing
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EP82109799A
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German (de)
French (fr)
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EP0078960B1 (en
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Ag Bayer
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Bayer AG
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Bayer AG
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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

Definitions

  • the invention relates to a method for gluing particulate material, in particular chips, wafers, beaches, fibers, chips, dust from various, optionally predried raw materials, in particular substances containing lignocellulose, such as wood, annual plants; but also from shredded material waste, by spraying glue onto the material dissolved into a particle veil.
  • a device for carrying out the method is shown, which is based on a known pneumatic material transport device with a conveying fan, feed screw, piping, separator, compensating vessel and knife lock.
  • a method of the type mentioned at the outset is known from DE-OS 1 653 223, in which a fine distribution device is provided for producing a particle veil.
  • the system used is tailored to the processing of fiber material, such as wood fibers, short-fiber fine wood dust, i.e. short, fine and thin fibers.
  • the fine distribution device for the fiber material essentially consists of a stationary sieve cage or a perforated wall and an agitator arranged inside the cage. A metering device for the fiber material is connected upstream of this fine distribution device.
  • the agitator in the fine distribution device is driven ben and has stirring arms, which drive the fiber material through the openings of the cage in superimposed planes radially outwards, so that in this way and without touching the particles with a wall a particle curtain is formed, which slides down in free fall and is formed in the form of a cylindrical surface is.
  • This particle curtain is glued in two stages, one from the inside and one or more times from the outside, by successively spraying binder or glue onto the particles of the particle curtain.
  • the particle curtain itself has a considerable thickness, so that the glue jets, which are applied to the particle curtain from the inside out, wet the particle curtain differently and penetrate the particle curtain to different depths. Gluing from the inside takes place without pressure. Gluing from outside can be done under pressure.
  • agitators are connected downstream or two wetting systems are provided in series, through which the particles are passed one after the other. The mechanical effort for these special treatments is considerable.
  • DE-OS 2 913 081 shows a method with which even wood chips of a flat design, such as are indispensable proportionately in a particle board, can be properly glued by the particle curtain of the wood chips between two gluing stages and the glue is applied primarily on the front in the first stage and predominantly on the back of the flat wood chips in the second stage.
  • the particle veil is made very thin. Considerable mechanical effort is also required here.
  • DE-OS 2 653 683 a method and a device are known, wherein a spirally moving ring is formed from wood chips and the wood chips are provided with the binder.
  • a high-speed mixer shaft is used, which generates the spirally moving ring of chips along the inner wall of the mixing container.
  • Glue centrifugal tubes with their outlet openings for the binder are immersed in this ring of chips.
  • the mixer shaft is provided in the entire gluing and mixing zone with such centrifugal glue pipes over the circumference and axially distributed.
  • the glue centrifugal pipes not only have the function of releasing the binding agent to the chips, but they also exert a certain mixing effect on the wood chips of the ring of chips.
  • the binding agent emerges from chips in the form of drops and is carried away by the passing chips by blurring.
  • the binder is distributed evenly over all chips by rubbing the wood chips using constantly changing relative speeds. Despite the considerable length, a homogeneous distribution is not achieved because the binder in the form of drops is initially transferred to individual chips in a very concentrated manner.
  • DE-AS 2 304 262 shows a very similar device, but the binder is added through tubes in the wall of the mixing container with a pressure-free feed. The openings of the tubes are in the ring of chips. Here, too, the binder in droplet form is removed from the chips at the free end of each feed tube and, by blurring and coming into contact with other chips, reaches other wood chips.
  • pneumatic chip transport devices with a conveying fan, feed screw, piping, separator, compensating vessel and knife lock or the like are known, which serve to transport the chips, for example from their production point to a further processing point.
  • the known systems convey the chips in a loosened form through pipelines with a more or less high proportion of transport air. Long transport routes can also be bridged without significant wear on system parts or an additional shredding effect on the chips.
  • the invention has for its object to achieve an optimal gluing of the material high in the 'meaning a homogeneous distribution of the glue and the same time to keep the mechanical complexity relatively low.
  • this is achieved in that the glue is sprayed on during the pneumatic conveying of material.
  • the pneumatic conveying device which is present anyway and in which a particle curtain is formed, is used for a second function, namely for gluing.
  • This eliminates the use of an additional gluing system and its additional drive.
  • the use of the pneumatic material conveying for the gluing of the material particles has the further advantage that hardly any wear occurs.
  • the pneumatic conveying device requires very little maintenance in comparison to, for example, a turbo mixing system. There is also no change in the particle size of the material as a result of undesired secondary comminution, as occurs in the case of intensively working gluing systems which are equipped with a mixer.
  • the glue can be sprayed on in a tube for pneumatic material conveyance. So the pipe or pipeline already there is used. It is not even necessary to change the diameter of the pipe. Of course, the binder must be sprayed on there, but this means comparatively little effort.
  • a medium pressure system with an air pressure of approximately 0.2 to 0.8 bar is used for the pneumatic conveying of goods.
  • These medium pressure systems have the advantage of a relatively high consistency, ie the ratio of air volume to particle volume is favorable here.
  • the binder is not diluted too much.
  • the particle curtain absorbs the binder, which is sprayed or atomized without the risk that the inner wall of the pipe or the pipeline is unreasonably wetted by the binder, so that build-up phenomena could form there.
  • a material density is favorable in which about 150 liters of chips with a layer weight of 100 kg / m 3 are conveyed or moved in one cubic meter of air.
  • a liquid pressure of about 200 bar can be useful for spraying on the glue in the pneumatic material conveying pipe, but it is not limited to that.
  • Two-substance nozzles that can be pressurized with air can also be used.
  • the gluing is expediently carried out by a plurality of spatially staggered nozzles which are arranged one behind the other in the tube.
  • the particle curtain can be evenly distributed by air baffles in the tube of the pneumatic material conveying and thinned in front of the outlet openings of the nozzles. H. be kept away from these outlet openings so that the binder is first dissolved in air and sprayed on, only to then come into contact with the good particles in a finer distribution.
  • glue polyisocyanate mixture of the diphenylmethane series such as. B. described in DE-AS 2 711 958, used alone or in a mixture with water, there is a very low risk of contamination of the pipeline of the pneumatic conveying.
  • the device for carrying out the method consists first of all of a pneumatic material transport device with conveying fan, feed screw, pipes, separator, expansion tank and knife lock and is characterized in that one or more nozzles for spraying the glue are arranged in one or more sections of the pipes of the material transport device. These nozzles are located at the end of supply pipes for the glue, which penetrate the pipe from the outside in and end more or less centrally in the axis of the pipe.
  • a medium-pressure blower with an air pressure of approximately 0.2 to 0.8 bar is used as the conveying blower in order to achieve a high material density around the nozzles in the pipeline, which is just favorable for the application of the glue. It can also more than one nozzle for spraying the glue at a minimum distance of about one meter in a row in the pipe of the material transport device in order to apply the glue step by step. This results in a particularly homogeneous distribution.
  • FIG. 1 shows the essential parts of a pneumatic material transport device for wood chips.
  • Air is drawn in by a conveying fan 2 via a filter 1 and pressed into the pipeline 3.
  • the pipeline 3 can be designed very differently depending on the local needs and consist of individual pipes 5 connected to one another via flanges 4. Only the essential parts of the pneumatic material transport device are shown here.
  • Downstream of the conveyor blower 2 and in the vicinity thereof, a feed device 6 with a corresponding lock is provided in order to be able to introduce the wood chips into the pneumatic conveyor system.
  • One or more sight glasses 7 can be installed in the pipeline 3 so that the air flow with the chips carried by it can be observed from the outside as a particle curtain in the form of a particle curtain.
  • the glue supply is provided on a pipe 5 or else distributed one behind the other on several pipes.
  • a pump 8 is used to apply the liquid pressure to the liquid glue, which is approximately 200 bar.
  • a line 9 leads through the wall of the tube 5 and ends in a nozzle 10 through which the glue is sprayed.
  • the nozzle 10 is arranged approximately in the axis of the tube 5 and points in the direction of conveyance of the chip flow according to arrow 11 that cause the exit end of the nozzle 10 to be kept free of chips.
  • the dissolved particle veil of the wood chips is expanded outwards at this point, so that the flow lines 13 result. This creates a pressure cone 14 behind the nozzle 10, in which the glue has the opportunity to mix with the air and to distribute it finely over a larger volume of air before it comes into contact with the particle curtain.
  • a plurality of nozzles 10 are provided axially one behind the other in the pipe 5 or in the pipe 3, but a minimum distance of one meter is not exceeded. In this way it is possible to gradually increase the glue application and to achieve a particularly homogeneous distribution of the glue on the particle veil of the wood chips.

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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)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Nozzles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Hard Magnetic Materials (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Vending Machines For Individual Products (AREA)
  • Road Signs Or Road Markings (AREA)
  • Jellies, Jams, And Syrups (AREA)
  • Confectionery (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

For achieving optimum application of bonding agent to particulate material, in particular chips, without elaborate plant and machinery, it is proposed to carry out the application of bonding agent using a pneumatic conveyor device for material which is in any case present, by arranging at least one spray nozzle for bonding agent in at least one section of the pipes of the material transport device and spraying the particles which are transported in the form of a film, using this spray nozzle for bonding agent.

Description

Die Erfindung bezieht sich auf ein Verfahren zum Beleimen von teilchenförmigem Gut, insbesondere Spänen, Wafers, Strands, Fasern, Schnitzeln, Staub aus verschiedenen, gegebenenfalls vorgetrockneten Rohstoffen, insbesondere lignozellulosehaltigen Stoffen, wie Holz, Einjahrespflanzen; darüber hinaus aber auch aus zerkleinerten Werkstoffabfällen, durch Sprühen von Leim auf das zu einem Teilchenschleier aufgelöste Gut. Es wird gleichzeitig eine Vorrichtung zur Durchführung des Verfahrens aufgezeigt, die auf einer bekannten pneumatischen Guttransportvorrichtung mit Fördergebläse, Aufgabeschnecke, Rohrleitungen, Abscheider, Ausgleichsgefäß und Messerschleuse aufbaut.The invention relates to a method for gluing particulate material, in particular chips, wafers, beaches, fibers, chips, dust from various, optionally predried raw materials, in particular substances containing lignocellulose, such as wood, annual plants; but also from shredded material waste, by spraying glue onto the material dissolved into a particle veil. At the same time, a device for carrying out the method is shown, which is based on a known pneumatic material transport device with a conveying fan, feed screw, piping, separator, compensating vessel and knife lock.

Ein Verfahren der eingangs genannten Art ist aus der DE-OS 1 653 223 bekannt, bei dem eine Feinverteileinrichtung zur Erzeugung eines Teilchenschleiers vorgesehen ist. Die dabei eingesetzte Anlage ist auf die Verarbeitung von Fasermaterial, wie Holzfasern, kurzfaserigem feinen Holzstaub, abgestimmt, also auf kurze, feine und dünne Fasern. Die Feinverteileinrichtung für das Fasermaterial besteht im wesentlichen aus einem stillstehenden Siebkäfig bzw. einer durchbrochenen Wandung und einem innerhalb des Käfigs angeordneten Rührwerk. Dieser Feinverteileinrichtung ist eine Zumeßeinrichtung für das Fasermaterial vorgeschaltet. Das Rührwerk in der Feinverteileinrichtung wird angetrieben und besitzt Rührarme, die das Fasermaterial durch die Durchbrechungen des Käfigs in übereinanderliegenden Ebenen radial nach außen austreiben, so daß auf diese Weise und ohne Berührung der Teilchen mit einer Wand ein Teilchenschleier gebildet wird, der im freien Fall niedergleitet und in Form einer Zylindermantelfläche ausgebildet ist. Dieser Teilchenschleier wird in zwei Stufen beleimt, und zwar einmal von innen und einmal oder mehrmals von außen, indem nacheinander Bindemittel bzw. Leim auf die Teilchen des Teilchenschleiers aufgesprüht wird. Der Teilchenschleier selbst besitzt eine beachtliche Dicke, so daß die Leimstrahlen, die von innen nach außen auf den Teilchenschleier aufgebracht werden, den Teilchenschleier unterschiedlich benetzen und unterschiedlich tief in den Teilchenschleier eindringen. Die Beleimung von innen erfolgt drucklos. Die Beleimung von außen kann unter Druck erfolgen. Um der ungleichmäßigen Beleimung entgegenzuwirken, werden Rührwerke nachgeschaltet oder auch zwei Benetzungsanlagen hintereinander vorgesehen, durch die die Teilchen nacheinander hindurchgeführt werden. Der maschinelle Aufwand für diese Sonderbehandlungen ist erheblich.A method of the type mentioned at the outset is known from DE-OS 1 653 223, in which a fine distribution device is provided for producing a particle veil. The system used is tailored to the processing of fiber material, such as wood fibers, short-fiber fine wood dust, i.e. short, fine and thin fibers. The fine distribution device for the fiber material essentially consists of a stationary sieve cage or a perforated wall and an agitator arranged inside the cage. A metering device for the fiber material is connected upstream of this fine distribution device. The agitator in the fine distribution device is driven ben and has stirring arms, which drive the fiber material through the openings of the cage in superimposed planes radially outwards, so that in this way and without touching the particles with a wall a particle curtain is formed, which slides down in free fall and is formed in the form of a cylindrical surface is. This particle curtain is glued in two stages, one from the inside and one or more times from the outside, by successively spraying binder or glue onto the particles of the particle curtain. The particle curtain itself has a considerable thickness, so that the glue jets, which are applied to the particle curtain from the inside out, wet the particle curtain differently and penetrate the particle curtain to different depths. Gluing from the inside takes place without pressure. Gluing from outside can be done under pressure. In order to counteract the uneven gluing, agitators are connected downstream or two wetting systems are provided in series, through which the particles are passed one after the other. The mechanical effort for these special treatments is considerable.

Um eine gleichmäßigere Beleimung der Teilchen eines Teilchenschleiers zu erzielen, wird in der DE-OS 2 913 081 ein Verfahren aufgezeigt, mit dem auch flächig ausgebildete Holzspäne, wie sie anteilmäßig in einer Holzspanplatte unerläßlich sind, ordnungsgemäß beleimt werden können, indem der Teilchenschleier der Holzspäne zwischen zwei Beleimungsstufen gewendet wird und der Leimauftrag in der ersten Stufe überwiegend auf die Vorderseite und in der zweiten Stufe überwiegend auf die Rückseite der flächigen Holzspäne erfolgt. Der Teilchenschleier wird dabei sehr dünn ausgebildet. Auch hier ist ein beachtlicher maschineller Aufwand erforderlich. Aus der DE-OS 2 653 683 sind ein Verfahren und eine Vorrichtung bekannt, wobei aus Holzspänen ein sich spiralförmig bewegender Ring gebildet wird und die Holzspäne dabei mit dem Bindemittel versehen werden. In der eingesetzten Vorrichtung findet eine schnellaufende Mischwerkswelle Anwendung, die den sich spiralig bewegenden Ring aus Spänen entlang der Innenwandung des Mischgutbehälters erzeugt. In diesen Ring aus Spänen tauchen Leimschleuderrohre mit ihren Austrittsöffnungen für das Bindemittel ein. Die Mischwerkswelle ist in der gesamten Beleim- und Mischzone mit solchen Leimschleuderrohren über den Umfang und axial verteilt versehen. Die Leimschleuderrohre haben nicht nur die Funktion, das Bindemittel an die Späne abzugeben, sondern sie üben auch noch eine gewisse Mischwirkung auf die Holzspäne des Ringes aus Spänen aus. Das Bindemittel tritt am Ende der Rohre im Ring aus Spänen in Tropfenform aus und wird von den vorbeistreichenden Spänen durch Verwischen mitgenommen. Das Bindemittel wird durch Reiben der Holzspäne unter Anwendung ständig wechselnder Relativgeschwindigkeiten gleichmäßig auf sämtliche Späne verteilt. Trotz erheblicher Baulänge wird keine homogene Verteilung erreicht, weil das Bindemittel in Tropfenform zunächst einmal sehr konzentriert auf einzelne Späne übertragen wird.In order to achieve a more uniform glueing of the particles of a particle curtain, DE-OS 2 913 081 shows a method with which even wood chips of a flat design, such as are indispensable proportionately in a particle board, can be properly glued by the particle curtain of the wood chips between two gluing stages and the glue is applied primarily on the front in the first stage and predominantly on the back of the flat wood chips in the second stage. The particle veil is made very thin. Considerable mechanical effort is also required here. From DE-OS 2 653 683 a method and a device are known, wherein a spirally moving ring is formed from wood chips and the wood chips are provided with the binder. In the device used, a high-speed mixer shaft is used, which generates the spirally moving ring of chips along the inner wall of the mixing container. Glue centrifugal tubes with their outlet openings for the binder are immersed in this ring of chips. The mixer shaft is provided in the entire gluing and mixing zone with such centrifugal glue pipes over the circumference and axially distributed. The glue centrifugal pipes not only have the function of releasing the binding agent to the chips, but they also exert a certain mixing effect on the wood chips of the ring of chips. At the end of the tubes in the ring, the binding agent emerges from chips in the form of drops and is carried away by the passing chips by blurring. The binder is distributed evenly over all chips by rubbing the wood chips using constantly changing relative speeds. Despite the considerable length, a homogeneous distribution is not achieved because the binder in the form of drops is initially transferred to individual chips in a very concentrated manner.

Eine ganz ähnliche Vorrichtung zeigt die DE-AS 2 304 262, wobei jedoch die Bindemittelzugabe durch Röhrchen in der Wandung des Mischbehälters unter druckfreiem Zulauf erfolgt. Die öffnungen der Röhrchen befinden sich in dem Ring aus Spänen. Auch hier wird das Bindemittel in Tropfenform von den Spänen am freien Ende jedes Zulaufröhrchens abgenommen und gelangt durch Verwischen und durch Kontakt mit anderen Spänen auf weitere Holzspäne.DE-AS 2 304 262 shows a very similar device, but the binder is added through tubes in the wall of the mixing container with a pressure-free feed. The openings of the tubes are in the ring of chips. Here, too, the binder in droplet form is removed from the chips at the free end of each feed tube and, by blurring and coming into contact with other chips, reaches other wood chips.

Auch bei diesen bekannten Vorrichtungen müssen gesonderte Anlagen eingesetzt und betrieben werden, die in jedem Fall einen zusätzlichen Aufwand darstellen.Also in these known devices, separate systems must be used and operated, which in any case represent an additional expense.

Andererseits sind pneumatische Spänetransportvorrichtungen mit Fördergebläse, Aufgabeschnecke, Rohrleitungen, Abscheider, Ausgleichsgefäß und Messerschleuse oder dergleichen bekannt, die dazu dienen, die Späne zu transportieren, beispielsweise von ihrer Erzeugungsstelle zu einer Weiterverarbeitungsstelle. Die bekannten Anlagen fördern mit einem mehr oder weniger hohen Anteil an Transportluft die Späne in aufgelockerter Form durch Rohrleitungen. Dabei sind auch lange Transportwege überbrückbar, ohne daß ein wesentlicher Verschleiß an Anlagenteilen oder eine zusätzliche Zerkleinerungswirkung an den Spänen auftritt.On the other hand, pneumatic chip transport devices with a conveying fan, feed screw, piping, separator, compensating vessel and knife lock or the like are known, which serve to transport the chips, for example from their production point to a further processing point. The known systems convey the chips in a loosened form through pipelines with a more or less high proportion of transport air. Long transport routes can also be bridged without significant wear on system parts or an additional shredding effect on the chips.

Der Erfindung liegt die Aufgabe zugrunde, eine optimale Beleimung des Gutes im 'Sinne hoher homogener Verteilung des Leimes zu erreichen und gleichzeitig den maschinellen Aufwand vergleichsweise gering zu halten.The invention has for its object to achieve an optimal gluing of the material high in the 'meaning a homogeneous distribution of the glue and the same time to keep the mechanical complexity relatively low.

Erfindungsgemäß wird dies dadurch erreicht, daß das Aufsprühen des Leimes während der pneumatischen Gutförderung erfolgt. Dies hat den wesentlichen Vorteil, daß die ohnehin vorhandene pneumatische Fördereinrichtung, in welcher ein Teilchenschleier gebildet wird, zu einer zweiten Funktion herangezogen wird, nämlich zum Beleimen. Damit entfällt die Verwendung einer zusätzlichen Beleimungsanlage und deren zusätzlicher Antrieb. Das Ausnutzen der pneumatischen Gutförderung für die Beleimung der Gutteilchen hat den weiteren Vorteil, daß kaum Verschleiß auftritt. Die pneumatische Fördereinrichtung ist im Vergleich zu beispielsweise einer Turbomischanlage sehr wartungsarm. Es tritt auch keine Änderung der Teilchengröße des Gutes durch unerwünschte Nachzerkleinerung ein, wie dies bei intensiv arbeitenden Beleimungsanlagen, die mit einem Mischer ausgestattet sind, auftritt. Oft ist dort aber gerade die Mischzone unerläßlich, um eine Weiterverteilung des Leimes von einem Teilchen auf das andere zu erreichen. Durch die Beleimung während der pneumatischen Gutförderung tritt auch keine Aufheizung des Gutes ein, die in Rührwerken durch die eingebrachte Rührenergie oft beobachtet wird. Dadurch erhöht sich die Gebrauchsdauer der beleimten Gutteilchen. Weiterhin ist es vorteilhaft, daß die bei Mischanlagen erforderliche Reinigung bei Verwendung der pneumatischen Späneförderung zu Beleimzwecken weitgehend entfallen kann.According to the invention, this is achieved in that the glue is sprayed on during the pneumatic conveying of material. This has the essential advantage that the pneumatic conveying device, which is present anyway and in which a particle curtain is formed, is used for a second function, namely for gluing. This eliminates the use of an additional gluing system and its additional drive. The use of the pneumatic material conveying for the gluing of the material particles has the further advantage that hardly any wear occurs. The pneumatic conveying device requires very little maintenance in comparison to, for example, a turbo mixing system. There is also no change in the particle size of the material as a result of undesired secondary comminution, as occurs in the case of intensively working gluing systems which are equipped with a mixer. But there is often the mixing zone is indispensable in order to distribute the glue from one particle to the other. Due to the gluing during the pneumatic conveying of goods, there is also no heating of the goods, which is often observed in agitators due to the stirring energy introduced. This increases the useful life of the glued particles. Furthermore, it is advantageous that the cleaning required in mixing plants can largely be dispensed with when using pneumatic chip conveying for gluing purposes.

Das Aufsprühen des Leimes kann in einem Rohr der pneumatischen Gutförderung durchgeführt werden. Es wird also das ohnehin dort vorhandene Rohr bzw. die Rohrleitung benutzt. Es ist nicht einmal erforderlich, den Durchmesser des Rohres zu verändern. Selbstverständlich muß das Bindemittel dort aufgesprüht werden, was aber einen vergleichsweise geringen Aufwand bedeutet.The glue can be sprayed on in a tube for pneumatic material conveyance. So the pipe or pipeline already there is used. It is not even necessary to change the diameter of the pipe. Of course, the binder must be sprayed on there, but this means comparatively little effort.

Besonders vorteilhaft ist es, wenn für die pneumatische Gutförderung ein Mitteldrucksystem mit etwa 0,2 bis 0,8 bar Luftdruck eingesetzt wird. Diese Mitteldrucksysteme haben den Vorteil einer relativ hohen Stoffdichte, d. h. das Verhältnis von Luftmenge zu Teilchenmenge ist hier günstig. Das Bindemittel wird nicht zu sehr verdünnt. Der Teilchenschleier nimmt das Bindemittel auf, welches versprüht bzw. verdüst wird, ohne daß die Gefahr besteht, daß die Innenwandung des Rohres bzw. der Rohrleitung unzumutbar von dem Bindemittel benetzt wird, so daß sich dort Aufbauerscheinungen ausbilden könnten. Günstig ist eine Stoffdichte, bei der etwa 150 Liter Späne mit einem Schichtgewicht von 100 kg/m3 in einem Kubikmeter Luft gefördert bzw. bewegt werden. Für das Aufsprühen des Leimes in dem Rohr der pneumatischen Gutförderung kann ein Flüssigkeitsdruck von etwa 200 bar sinnvoll sein, ist aber nicht darauf beschränkt. Auch druckluftbeaufschlagbare Zweistoffdüsen können Anwendung finden.It is particularly advantageous if a medium pressure system with an air pressure of approximately 0.2 to 0.8 bar is used for the pneumatic conveying of goods. These medium pressure systems have the advantage of a relatively high consistency, ie the ratio of air volume to particle volume is favorable here. The binder is not diluted too much. The particle curtain absorbs the binder, which is sprayed or atomized without the risk that the inner wall of the pipe or the pipeline is unreasonably wetted by the binder, so that build-up phenomena could form there. A material density is favorable in which about 150 liters of chips with a layer weight of 100 kg / m 3 are conveyed or moved in one cubic meter of air. A liquid pressure of about 200 bar can be useful for spraying on the glue in the pneumatic material conveying pipe, but it is not limited to that. Two-substance nozzles that can be pressurized with air can also be used.

Die Beleimung erfolgt zweckmäßig durch mehrere räumlich versetzt angeordnete Düsen, die hintereinander in dem Rohr angeordnet sind.The gluing is expediently carried out by a plurality of spatially staggered nozzles which are arranged one behind the other in the tube.

Der Teilchenschleier kann durch Luftleiteinbauten im Rohr der pneumatischen Gutförderung gleichmäßig verteilt und vor den Austrittsöffnungeh der Düsen verdünnt werden, d. h. von diesen Austrittsöffnungen ferngehalten werden, damit zunächst einmal das Bindemittel in Luft aufgelöst und aufgesprüht wird, um dann in feinerer Verteilung erst mit den Gutteilchen in Kontakt zu treten.The particle curtain can be evenly distributed by air baffles in the tube of the pneumatic material conveying and thinned in front of the outlet openings of the nozzles. H. be kept away from these outlet openings so that the binder is first dissolved in air and sprayed on, only to then come into contact with the good particles in a finer distribution.

Sofern als Leim Polyisocyanatgemisch der DiphenylmethanReihe (polymeres MDI), wie z. B. in der DE-AS 2 711 958 beschrieben, allein oder in Mischung mit Wasser eingesetzt wird, besteht eine sehr geringe Verschmutzungsgefahr der Rohrleitung der pneumatischen Gutförderung.If the glue polyisocyanate mixture of the diphenylmethane series (polymeric MDI), such as. B. described in DE-AS 2 711 958, used alone or in a mixture with water, there is a very low risk of contamination of the pipeline of the pneumatic conveying.

Die Vorrichtung zur Durchführung des Verfahrens besteht zunächst aus einer pneumatischen Guttransportvorrichtung mit Fördergebläse, Aufgabeschnecke, Rohrleitungen, Abscheider, Ausgleichsgefäß und Messerschleuse und kennzeichnet sich dadurch, daß eine oder mehrere Düsen zum Versprühen des Leimes in einem oder mehreren Abschnitten der Rohre der Guttransportvorrichtung angeordnet sind. Diese Düsen sitzen am Ende von Zufuhrrohren für den Leim, die das Rohr von außen nach innen durchdringen und mehr oder weniger zentrisch in der Achse der Rohrleitung enden. Als Fördergebläse wird ein Mitteldruckgebläse mit etwa 0,2 bis 0,8 bar Luftdruck eingesetzt, um um die Düsen in der Rohrleitung herum eine hohe Stoffdichte zu erzielen, die für die Aufbringung des Leimes gerade günstig ist. Es können auch mehr als eine Düse zum Versprühen des Leimes in einem Mindestabstand von etwa einem Meter hintereinander im Rohr der Guttransportvorrichtung angeordnet sein, um den Leimauftrag stufenweise aufzubringen. Hierdurch wird eine besonders homogene Verteilung erreicht.The device for carrying out the method consists first of all of a pneumatic material transport device with conveying fan, feed screw, pipes, separator, expansion tank and knife lock and is characterized in that one or more nozzles for spraying the glue are arranged in one or more sections of the pipes of the material transport device. These nozzles are located at the end of supply pipes for the glue, which penetrate the pipe from the outside in and end more or less centrally in the axis of the pipe. A medium-pressure blower with an air pressure of approximately 0.2 to 0.8 bar is used as the conveying blower in order to achieve a high material density around the nozzles in the pipeline, which is just favorable for the application of the glue. It can also more than one nozzle for spraying the glue at a minimum distance of about one meter in a row in the pipe of the material transport device in order to apply the glue step by step. This results in a particularly homogeneous distribution.

Ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

  • Fig. 1 eine schematische Übersichtsskizze der Vorrichtung insgesamt und
  • Fig. 2 einen Schnitt durch das Rohr mit Düse.
An embodiment of the device according to the invention is shown in the drawing and is described in more detail below. Show it:
  • Fig. 1 is a schematic overview sketch of the device as a whole and
  • Fig. 2 shows a section through the tube with a nozzle.

Die in Fig. 1 dargestellte Anlage zeigt die wesentlichen Teile einer pneumatischen Guttransportvorrichtung für Holzspäne. über ein Filter 1 wird von einem Fördergebläse 2 Luft angesaugt und in die Rohrleitung 3 gepreßt. Die Rohrleitung 3 kann je nach den örtlichen Bedürfnissen ganz verschieden ausgebildet sein und aus einzelnen über Flansche 4 miteinander verbundenen Rohren 5 bestehen. Es sind hier nur die wesentlichen Teile der pneumatischen Guttransportvorrichtung dargestellt. Dem Fördergebläse 2 nachgeschaltet und in dessen Nähe ist eine Aufgabeeinrichtung 6 mit entsprechender Schleuse vorgesehen, um die Holzspäne in die pneumatische Förderanlage einbringen zu können. In der Rohrleitung 3 können ein oder mehrere Schaugläser 7 eingebaut sein, damit der Luftstrom mit den durch ihn getragenen Spänen in der Auflösung als Teilchenschleier von außen beobachtet werden kann.The system shown in Fig. 1 shows the essential parts of a pneumatic material transport device for wood chips. Air is drawn in by a conveying fan 2 via a filter 1 and pressed into the pipeline 3. The pipeline 3 can be designed very differently depending on the local needs and consist of individual pipes 5 connected to one another via flanges 4. Only the essential parts of the pneumatic material transport device are shown here. Downstream of the conveyor blower 2 and in the vicinity thereof, a feed device 6 with a corresponding lock is provided in order to be able to introduce the wood chips into the pneumatic conveyor system. One or more sight glasses 7 can be installed in the pipeline 3 so that the air flow with the chips carried by it can be observed from the outside as a particle curtain in the form of a particle curtain.

An geeigneter Stelle im Bereich der Rohrleitung 3 ist an einem Rohr 5 oder auch verteilt hintereinander an mehre- ,ren Rohren die Leimzuführung vorgesehen. Eine Pumpe 8 dient dem Aufbringen des Flüssigkeitsdruckes auf den flüssigen Leim, der etwa 200 bar beträgt. Durch die Wandung des Rohres 5 hindurch führt eine Leitung 9, die in einer Düse 10 endet, durch die der Leim versprüht wird. Wie aus Fig. 2 ersichtlich ist, ist die Düse 10 etwa in der Achse des Rohres 5 angeordnet und weist in Förderrichtung des Spänestroms gemäß Pfeil 11. Die Düse 10 bzw. das Ende der Leitung 9 ist von trichter- bzw. kegelförmigen Luftleiteinbauten 12 umgeben, die bewirken, daß das Austrittsende der Düse 10 frei von Spänen gehalten wird. Der aufgelöste Teilchenschleier der Holzspäne wird an dieser Stelle nach außen aufgeweitet, so daß sich die Strömungslinien 13 ergeben. Hierdurch baut sich ein Druckkegel 14 hinter der Düse 10 auf, in welchem der Leim Gelegenheit hat, sich mit der Luft zu durchmischen und auf ein größeres Luftvolumen fein zu verteilen, bevor dies mit dem Teilchenschleier in Kontakt tritt.At a suitable point in the area of the pipeline 3, the glue supply is provided on a pipe 5 or else distributed one behind the other on several pipes. A pump 8 is used to apply the liquid pressure to the liquid glue, which is approximately 200 bar. A line 9 leads through the wall of the tube 5 and ends in a nozzle 10 through which the glue is sprayed. As can be seen from FIG. 2, the nozzle 10 is arranged approximately in the axis of the tube 5 and points in the direction of conveyance of the chip flow according to arrow 11 that cause the exit end of the nozzle 10 to be kept free of chips. The dissolved particle veil of the wood chips is expanded outwards at this point, so that the flow lines 13 result. This creates a pressure cone 14 behind the nozzle 10, in which the glue has the opportunity to mix with the air and to distribute it finely over a larger volume of air before it comes into contact with the particle curtain.

Gemäß Fig. 2 sind mehrere Düsen 10 axial hintereinander verteilt im Rohr 5 bzw. in der Rohrleitung 3 vorgesehen, wobei ein Mindestabstand von einem Meter jedoch nicht unterschritten wird. Auf diese Weise ist es möglich, den Leimauftrag stufenweise zu erhöhen und eine besonders homogene Verteilung des Leimes auf den Teilchenschleier der Holzspäne zu erreichen.2, a plurality of nozzles 10 are provided axially one behind the other in the pipe 5 or in the pipe 3, but a minimum distance of one meter is not exceeded. In this way it is possible to gradually increase the glue application and to achieve a particularly homogeneous distribution of the glue on the particle veil of the wood chips.

Claims (9)

1. Verfahren zum Beleimen von teilchenförmigem Gut, insbesondere von Spänen, Fasern oder dergleichen, durch Sprühen von Leim auf das zu einem Teilchenschleier aufgelöste Gut, dadurch gekennzeichnet, daß das Aufsprühen des Leimes während der pneumatischen Gutförderung erfolgt.1. A method for gluing particulate material, in particular chips, fibers or the like, by spraying glue onto the material dissolved into a particle veil, characterized in that the glue is sprayed on during the pneumatic material conveyance. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Aufsprühen des Leimes .in einem Rohr (5) der pneumatischen Gutförderung durchgeführt wird.2. The method according to claim 1, characterized in that the spraying of the glue. In a tube (5) of the pneumatic material conveying is carried out. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß für die pneumatische Gutförderung ein Mitteldrucksystem mit 0,2 bis 0,8 bar Luftdruck eingesetzt wird.3. The method according to claims 1 and 2, characterized in that a medium pressure system with 0.2 to 0.8 bar air pressure is used for the pneumatic conveying of goods. 4. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Beleimung durch mehrere räumlich versetzt angeordnete Düsen (10) erfolgt.4. The method according to claims 1 to 3, characterized in that the gluing is carried out by several spatially offset nozzles (10). 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß der Teilchenschleier durch Luftleiteinbauten (12) im Rohr (5) der pneumatischen Späneförderung gleichmäßig verteilt und vor den Austrittsöffnungen der Düsen (10) verdünnt wird.5. The method according to claim 4, characterized in that the particle curtain is distributed evenly by air guide internals (12) in the tube (5) of the pneumatic chip conveyor and is diluted in front of the outlet openings of the nozzles (10). 6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Leim ein Polyisocyanatgemisch der DiphenylmethanReihe eingesetzt wird.6. The method according to claim 1, characterized in that a polyisocyanate mixture of the diphenylmethane series is used as the glue. 7. Vorrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 6, bestehend aus einer pneumatischen Guttransportvorrichtung mit Fördergebläse (2), Aufgabeeinrichtung (6), Rohrleitungen (3, 5), Abscheider (1), Ausgleichsgefäß und Messerschleuse, dadurch gekennzeichnet, daß mindestens eine Leimsprühdüse (10) in wenigstens einem Abschnitt der Rohre (5) der Guttransportvorrichtung angeordnet ist.7. Device for performing the method according to claims 1 to 6, consisting of a pneumatic material transport device with conveying fan (2), feed device (6), pipes (3, 5), separator (1), off Equal vessel and knife lock, characterized in that at least one glue spray nozzle (10) is arranged in at least a section of the tubes (5) of the material transport device. 8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß das Fördergebläse (2) aus einem Mitteldruckgebläse für 0,2 bis 0,8 bar Luftdruck besteht.8. The device according to claim 7, characterized in that the conveying fan (2) consists of a medium-pressure fan for 0.2 to 0.8 bar air pressure. 9. Vorrichtung nach den Ansprüchen 7 und 8, dadurch gekennzeichnet, daß die Leimsprühdüsen (10) in einem Mindestabstand von etwa einem Meter hintereinander im Rohr (5) der Guttransportvorrichtung angeordnet sind.9. Device according to claims 7 and 8, characterized in that the glue spray nozzles (10) are arranged at a minimum distance of about one meter in a row in the tube (5) of the material transport device.
EP82109799A 1981-11-05 1982-10-23 Method and device for glueing particles, especially wood-shavings Expired EP0078960B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82109799T ATE19606T1 (en) 1981-11-05 1982-10-23 METHOD AND DEVICE FOR GLUEING PARTICULATE GOOD,. PARTICULARLY FROM SPAENEN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3143895 1981-11-05
DE3143895A DE3143895C2 (en) 1981-11-05 1981-11-05 Method and device for applying glue to particulate material in the form of chips, fibers or the like.

Publications (2)

Publication Number Publication Date
EP0078960A1 true EP0078960A1 (en) 1983-05-18
EP0078960B1 EP0078960B1 (en) 1986-05-07

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EP82109799A Expired EP0078960B1 (en) 1981-11-05 1982-10-23 Method and device for glueing particles, especially wood-shavings

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US (1) US4510184A (en)
EP (1) EP0078960B1 (en)
AT (1) ATE19606T1 (en)
BE (1) BE894930A (en)
CA (1) CA1192796A (en)
DE (1) DE3143895C2 (en)
DK (1) DK159482C (en)
ES (1) ES8401335A1 (en)
FI (1) FI73166C (en)
FR (1) FR2515535B1 (en)

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EP0744259A2 (en) * 1995-05-24 1996-11-27 C.M.P. Costruzioni Meccaniche Pomponesco S.p.A. Gluing machine for wood fibreboard panel production plants, and a plant using the gluing machine
DE10153593A1 (en) * 2001-11-02 2003-05-22 Fritz Egger Gmbh & Co Unterrad Method and device for wetting wood fibers with a binder fluid
EP1862214A2 (en) 2006-06-03 2007-12-05 Glunz Ag Procedure and device for liming fibres around a blast pipe

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US5057166A (en) * 1989-03-20 1991-10-15 Weyerhaeuser Corporation Method of treating discontinuous fibers
US5064689A (en) * 1989-03-20 1991-11-12 Weyerhaeuser Company Method of treating discontinuous fibers
US5230959A (en) * 1989-03-20 1993-07-27 Weyerhaeuser Company Coated fiber product with adhered super absorbent particles
US5432000A (en) * 1989-03-20 1995-07-11 Weyerhaeuser Company Binder coated discontinuous fibers with adhered particulate materials
US5498478A (en) * 1989-03-20 1996-03-12 Weyerhaeuser Company Polyethylene glycol as a binder material for fibers
US5071675A (en) * 1989-03-20 1991-12-10 Weyerhaeuser Company Method of applying liquid sizing of alkyl ketene dimer in ethanol to cellulose fibers entrained in a gas stream
DE4122842C2 (en) * 1991-07-10 1993-11-18 Glunz Ag Process for the production of fiberboard from lumpy wood particles and isocyanate as a binder
SE502518C2 (en) * 1991-09-05 1995-11-06 Sunds Defibrator Ind Ab Methods and apparatus for bonding particles
WO1993012282A1 (en) 1991-12-17 1993-06-24 Weyerhaeuser Company Hopper blender system and method for coating fibers
DE19506353A1 (en) * 1995-02-23 1996-08-29 Schenck Ag Carl Method and device for wetting with a fluid
IT1307924B1 (en) * 1999-01-25 2001-11-29 Cmp Spa GLUING MACHINE FOR PLANTS TO PRODUCE WOOD INFIBRA PANELS.
PT1663593E (en) * 2003-09-12 2007-10-10 Kronospan Tech Co Ltd High-pressure gluing in a fiber mixer
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EP0744259A2 (en) * 1995-05-24 1996-11-27 C.M.P. Costruzioni Meccaniche Pomponesco S.p.A. Gluing machine for wood fibreboard panel production plants, and a plant using the gluing machine
EP0744259A3 (en) * 1995-05-24 1996-12-11 C.M.P. Costruzioni Meccaniche Pomponesco S.p.A. Gluing machine for wood fibreboard panel production plants, and a plant using the gluing machine
US5792264A (en) * 1995-05-24 1998-08-11 C.M.P. Costruzioni Meccaniche Pomponesco S.P.A. Gluing machine for wood fibreboard panel production plants, and a plant using the gluing machine
DE10153593A1 (en) * 2001-11-02 2003-05-22 Fritz Egger Gmbh & Co Unterrad Method and device for wetting wood fibers with a binder fluid
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EP1862214A2 (en) 2006-06-03 2007-12-05 Glunz Ag Procedure and device for liming fibres around a blast pipe
EP1862214A3 (en) * 2006-06-03 2008-07-02 Glunz Ag Procedure and device for liming fibres around a blast pipe

Also Published As

Publication number Publication date
ES517106A0 (en) 1983-12-16
FR2515535A1 (en) 1983-05-06
FR2515535B1 (en) 1986-11-07
FI73166C (en) 1987-09-10
ES8401335A1 (en) 1983-12-16
DK159482C (en) 1991-04-08
US4510184A (en) 1985-04-09
DE3143895A1 (en) 1983-05-11
FI823760A0 (en) 1982-11-03
DK159482B (en) 1990-10-22
CA1192796A (en) 1985-09-03
FI73166B (en) 1987-05-29
EP0078960B1 (en) 1986-05-07
DK490382A (en) 1983-05-06
DE3143895C2 (en) 1985-01-17
BE894930A (en) 1983-03-01
ATE19606T1 (en) 1986-05-15
FI823760L (en) 1983-05-06

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