EP0728562B1 - Appareil et procédé pour mouiller des particules avec un liquide - Google Patents

Appareil et procédé pour mouiller des particules avec un liquide Download PDF

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Publication number
EP0728562B1
EP0728562B1 EP96101889A EP96101889A EP0728562B1 EP 0728562 B1 EP0728562 B1 EP 0728562B1 EP 96101889 A EP96101889 A EP 96101889A EP 96101889 A EP96101889 A EP 96101889A EP 0728562 B1 EP0728562 B1 EP 0728562B1
Authority
EP
European Patent Office
Prior art keywords
accordance
particles
wetting
fluid
feed line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96101889A
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German (de)
English (en)
Other versions
EP0728562A3 (fr
EP0728562A2 (fr
Inventor
Albrecht Dr. Epple
Herbert G. Nopper
Wolfgang Haag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dieffenbacher Schenck Panel GmbH
Original Assignee
Dieffenbacher Schenck Panel GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dieffenbacher Schenck Panel GmbH filed Critical Dieffenbacher Schenck Panel GmbH
Publication of EP0728562A2 publication Critical patent/EP0728562A2/fr
Publication of EP0728562A3 publication Critical patent/EP0728562A3/fr
Application granted granted Critical
Publication of EP0728562B1 publication Critical patent/EP0728562B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent

Definitions

  • the invention relates to a method for wetting Particles with a fluid according to the preamble of Claim 1 and a device for wetting Particles with a fluid according to the preamble of Claim 10.
  • Such methods and devices are used, for example, for gluing fibers in the course of Manufacture of plate-shaped materials from chips and fibers, especially fiberboard (wood-based panels and building boards from mineral and / or textile and / or synthetic Fibers used.
  • Document DE-A-3 143 895 discloses a method and such an apparatus with a gluing zone for Glueing of chips, which has a constant Has cross section, being within that of the particles cross-section through which a gluing nozzle is arranged is. It has been shown that with such an arrangement Problem of glue spots when gluing chip and fibrous particles cannot be controlled since it not succeed with the known arrangement, which for Particles tend to form fibers before gluing to loosen or separate sufficiently.
  • DE-A 16 32 450 describes a method and an apparatus for continuous mixing of small quantities of a fine particle Component with an air flow Carrier, especially for wetting chip and fibrous substances with binders according to the preambles of claims 1 and 10 known.
  • the mixing tubes are narrowed in the area of the nozzles. This results in a longer dwell time Carrier, especially the heavier Mixture components.
  • the invention is therefore based on the object of creating a method or a device according to the type mentioned above, which makes it possible to achieve economical wetting with a fluid, which is distinguished by a particularly uniform and fine distribution, with little mechanical outlay.
  • This object is achieved in the inventive method according to the characterizing part of patent claim 1 in that the particles pass through a drying device before reaching the wetting zone.
  • the object is further achieved by a device according to the characterizing part of claim 10 in that is upstream of the wetting zone of a dryer.
  • the particle resolution can still be increased if the wetting zone an accelerated section with a reduced diameter is connected upstream, as this results in the effect of the sudden conversion a fast laminar flow into a slow turbulent Flow is amplified.
  • a particularly suitable field of application of the invention is Gluing of fibers, especially wood fibers. Because through that extremely high resolution of the particle stream, in this case one Fiber flow, it is even possible to have already dried fibers, which tend to form lumps or balls, to glue economically and evenly in the air flow. So far because of the problematic ball formation, the glue was added damp fibers performed, which then dried were.
  • the fiber drying after gluing has the big disadvantage that 5 to 15% of the amount of glue used by pre-curing and volatilization are lost, in addition to note that the proportion of formaldehyde proportional to the amount of glue the dryer exhaust air polluted and caused complex environmental protection measures.
  • the glueing of already dried fibers also has the advantage that the lower humidity (5 to 12%) Influence of the pH value on the resin is greatly reduced.
  • steam can be injected into the material flow.
  • a weighing station for determining the actual existing throughput is provided, which as an input variable to control the amount of fluid to be sprayed and / or Fluid composition is used.
  • the walls of the wetting zone can be tempered. So can, for example, when using the invention as a gluing station a drop below the dew point on the inner surface can be achieved by cooling, thereby baking the Glue is prevented safely.
  • a particularly fine wettability is also favored by that a station to influence the state of charge of the flowing particles is provided, which in combination with the connection a certain charge state of the wetting fluid between fluid and particles improved and thus a Stains prevented.
  • the air temperature below 100 ° C preferably is between 50 and 70 ° C, so is a more uniform Particle moisture, especially with wood fibers, achievable; further it is possible to glue in a second dryer stage and it can also be done without adding steam when producing Wood fiber boards shorten the pressing times.
  • the binder temperature should be below 80 ° C, especially around 40-60 ° C. This measure enables it works with a lower proportion of dilution water, which in turn can save dryer performance. Also can binders with a higher proportion of solid resin be used. This binder becomes less strong from sucked up by the particles, causing the so-called "sagging" is avoided. The binder viscosity remains through that Warming even without thinning in an area where there is a optimal atomization can take place through the nozzles.
  • FIG. 1 shows a schematic overview the use of the invention for fiber gluing in the course of Production of fiberboard
  • Figure 2 shows one of the invention Device containing section of the delivery line.
  • FIG. 1 shows a section of a block diagram Plant for the production of wood-based panels from wood fibers or, for example, MDF boards made from wood fibers.
  • the previously processed fibers are first fed to a dryer 1, from where they are transported to a fiber bunker by air transport 2 3 arrive. Now there is a moisture measurement 4, whose Output signal controls dryer 1.
  • the wetting zone is transported by a conveyor line 6, they pass through a mass determination station 5, which is designed as a belt scale or as a mass flow measuring device can be.
  • the glue nozzle with a high pressure pump 6a connected, which is fed from a storage container 6b becomes.
  • the glued fibers pass through the classifier 7 and are then pneumatic (air transport 8) Scatter bunker 9, which is assigned to the molding station 10. There the glued fibers are scattered to a mat and then pressed into plates.
  • FIG. 2 shows a section of the delivery line between the mass determination station 5 and the classifier 7, which contains the wetting zone 6.
  • a reducer 21, an intermediate tube 22 and a diffuser section 23 are integrated in the delivery line 20, which has a diameter d 1 .
  • the reducing piece 21 tapers in the conveying direction, corresponding to a Venturi nozzle, to the diameter d 2 of the intermediate tube 22.
  • the diameter d 2 of the reducing piece 22 is approximately 25 to 35% smaller than the diameter d 1 of the conveying line 20.
  • the diffuser section 23 widens in the direction of flow first seen as a bulbous diameter d 3 , which is about 10 to 70% larger than the diameter d 1 of the delivery line 20.
  • This expansion takes place over a length l 3 ; This extension is followed by a taper over a length l 4 to a smaller diameter, which in turn corresponds to the diameter d 1 of the delivery line 20 to which the diffuser section 23 is flanged.
  • each glue nozzle can be reached safely and their orientation ⁇ in relation to the horizontal
  • the central axis of the delivery line is provided to be adjustable.
  • the gluing nozzles 24 are known as return nozzle lances trained to ensure that regardless of the changing flow rate over time, automatically, a uniformly fine spray is always generated.
  • the diffuser section consists of high-quality, pore-tight and polished material to prevent glue deposits.
  • the diffuser section is of several Cooling tube windings 25 with a coolant inlet 26 and a Coolant drain 27 surrounded.
  • a smooth release film it is also beneficial to have a lining of the wetting zone a smooth release film. It could also Lining with a double film, through which then one Bath liquid can be passed.
  • the fibers pneumatically conveyed in the horizontally running conveyor line 20 are accelerated when the reducer 21 is reached and reach their maximum speed v 2 in the intermediate tube 22. This creates a laminar flow.
  • the fibers When flowing into the diffuser section 23, the fibers are abruptly braked to the speed v 3 , so that a turbulent flow occurs. As a result, the fiber flow is loosened up very strongly, so that the conveyed material is present as a single fiber. Any balls of fiber previously formed are dissolved.
  • This finely resolved fiber stream passes through the wetting zone (this corresponds approximately to the section l 3), the sprayed from the Beleimungsdüsen 24 binder mist. There the individual fibers are evenly wetted with the fine glue mist.
  • the fibers of the wetting zone have already dried glueing can take place at room temperature, whereby the amount of glue to be used per fiber amount an economically favorable low value can be set can. It goes without saying that the glueing in a preheated air flow with temperatures below 100 ° C preferably 50 to 75 ° C can be carried out, if possible to bring a lot of thermal energy into the fiber mat to be spread.
  • binders based on Isocyanate base are built up and that in conventional Glueing due to its sensitivity to moisture and temperature are not suitable.
  • the delivery line 20, the Reducer 21, the intermediate tube 22 and the diffuser section 23 instead of the described rotationally symmetrical cross sections can also have a polygonal cross-sectional shape.
  • the diffuser section 23 and / or the reducer 21 not necessarily the streamlined course described have, but it can also cross-sectional jumps or ramps are used.

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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)

Claims (21)

  1. Procédé de mouillage de particules avec un fluide, comportant les étapes suivantes :
    a) amenée des particules depuis une cuve dans une conduite de transport (20),
    b) transport pneumatique à l'intérieur de cette conduite de transport, vers un poste de retraitement et
    c) pulvérisation des particules s'écoulant dans la conduite de transport (20), dans une zone de mouillage,
    d) augmentation de la vitesse d'écoulement des particules dans une portion de conduite (21, 22) qui est située en amont de la zone de mouillage (23),
    e) ensuite, relâchement du courant de particules par réduction de la vitesse d'écoulement à l'intérieur de la zone de mouillage (23),
    caractérisé en ce qu'avant d'atteindre la zone de mouillage, les particules traversent un dispositif de séchage (1).
  2. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'humidité des particules est réglée avec précision par injection de vapeur au moyen d'injecteurs de vapeur dans la zone de la conduite de transport.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'au cours d'une autre étape de procédé, il est procédé à une détermination du débit des particules, qui sert de grandeur d'entrée pour la régulation de la quantité de fluide à pulvériser et/ou de la composition du fluide.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu une étape de procédé pour la commande de l'état de charge des particules, avant leur mouillage.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on utilise un liant comme fluide de mouillage.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que le mouillage s'effectue avec un liant préchauffé.
  7. Procédé selon l'une des revendication précédentes, caractérisé en ce que le mouillage s'effectue pendant un transport pneumatique horizontal des particules.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la surface d'enveloppe de la zone de mouillage peut être tempérée de manière que la température de la surface intérieure de la zone de mouillage soit inférieure au point de rosée.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que le mouillage s'effectue à des températures inférieures à 100 °C, de préférence entre 50 et 75 °C.
  10. Dispositif de mouillage de particules transportées pneumatiquement avec un fluide, le fluide étant pulvérisé au moyen d'au moins une buse dans une conduite de transport traversée par les particules, la ou les buses (24) étant disposées dans une portion de diffusion (23) de la conduite de transport, qui présente un élargissement (23) de sa section, et la conduite de transport, vue dans le sens d'écoulement, présentant avant la portion de diffusion (23), une portion de section réduite (22), caractérisé en ce que la zone de mouillage (23) est située devant un dispositif de séchage (1).
  11. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la conduite de transport contient des injecteurs pour l'alimentation en vapeur.
  12. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un dispositif pour déterminer le débit des particules.
  13. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la quantité de fluide et/ou la composition du fluide peuvent être commandées.
  14. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la surface d'enveloppe de la zone de mouillage (23) peut être tempérée.
  15. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un dispositif d'ionisation est disposé devant la zone de mouillage.
  16. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la surface de section maximale dans la zone de mouillage (23) est supérieure à la section de la conduite de transport (20).
  17. Dispositif selon l'une des revendications précédentes, caractérisé par des lances à retour pour la pulvérisation du fluide.
  18. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le cône de pulvérisation des buses est réglable.
  19. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'orientation des buses (24) par rapport au courant de transport est réglable.
  20. Dispositif selon l'une des revendications précédentes, caractérisé en ce que plusieurs buses (24) réparties sur le pourtour de la zone de mouillage (23) sont prévues pour le mouillage.
  21. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la conduite de transport (20) est chargée d'air préchauffé et est isolée contre le rayonnement thermique.
EP96101889A 1995-02-23 1996-02-09 Appareil et procédé pour mouiller des particules avec un liquide Expired - Lifetime EP0728562B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19506353A DE19506353A1 (de) 1995-02-23 1995-02-23 Verfahren und Vorrichtung zum Benetzen mit einem Fluid
DE19506353 1995-02-23

Publications (3)

Publication Number Publication Date
EP0728562A2 EP0728562A2 (fr) 1996-08-28
EP0728562A3 EP0728562A3 (fr) 1997-03-19
EP0728562B1 true EP0728562B1 (fr) 2002-06-05

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ID=7754865

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Application Number Title Priority Date Filing Date
EP96101889A Expired - Lifetime EP0728562B1 (fr) 1995-02-23 1996-02-09 Appareil et procédé pour mouiller des particules avec un liquide

Country Status (4)

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US (1) US5827566A (fr)
EP (1) EP0728562B1 (fr)
CA (1) CA2170207A1 (fr)
DE (2) DE19506353A1 (fr)

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DE19732931A1 (de) * 1997-07-31 1999-02-04 Frank Petrick Verfahren und Vorrichtung zum Beschichten und/oder Ummanteln von granulatförmigen Partikeln mit einem aushärtbaren Klebstoff
DE19740676C2 (de) * 1997-09-16 2003-07-17 Fraunhofer Ges Forschung Verfahren zum Beleimen von Fasern
DE19930800A1 (de) * 1998-08-05 2000-02-17 Fraunhofer Ges Forschung Verfahren zur Herstellung von MDF-Platten
US6902125B2 (en) 2000-05-24 2005-06-07 Fritz Schneider Process and device for disintegrating irregularities in flows of wood fibres
ATE324967T1 (de) 2000-08-11 2006-06-15 Flakeboard Company Ltd Verfahren und vorrichtung zum beleimen von zur herstellung von faserplatten vorgesehenen, getrockneten fasern
DE10059881B4 (de) 2000-12-01 2005-06-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Anlage zur Faseraufbereitung
DE10153593B4 (de) * 2001-11-02 2005-11-17 Fritz Egger Gmbh & Co Vorrichtung und Verfahren zum Benetzen von Holzfasern mit einem Bindemittelfluid
DE10336533A1 (de) * 2003-08-05 2005-02-24 Dieffenbacher Gmbh + Co. Kg Verfahren und Vorrichtung zum Benetzen von rieselförmigen Gütern mit einem Bindemittel
DE10347052A1 (de) 2003-10-07 2005-05-04 Schenkmann Piel Engineering Gm Verfahren zur Herstellung von Faserplatten aus Holzfasern
CA2577923C (fr) * 2004-08-27 2013-07-02 Force Technology Procede et dispositif pour l'application d'un liant synthetique sur un flux de fibres aerien
DE102008052961B4 (de) * 2008-10-23 2016-07-28 SWISS KRONO Tec AG Verfahren zum Herstellen von Holzwerkstoffen
DE202008015419U1 (de) 2008-11-21 2010-04-22 Epple, Albrecht, Dr. Vorrichtung zur Beleimung von Fasern in einem Blasrohr
DE102009006704A1 (de) * 2009-01-29 2010-08-12 Dieffenbacher Gmbh + Co. Kg Verfahren zum Betreiben einer Anlage und eine Anlage zur Herstellung von Faser-, MDF, HDF, Holzwerkstoff- oder Kunststoffplatten aus Fasern oder faserähnlichem Material
IT1399772B1 (it) 2010-04-30 2013-05-03 Imal Srl Apparato per l'iniezione di componenti chimici in un flusso di materiale legnoso incoerente
EP2431144B1 (fr) 2010-09-15 2012-10-31 Kronotec AG Procédé et dispositif destinés au collage humide de fibres en bois
DE102011007336A1 (de) * 2011-04-13 2013-04-25 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren zum Betreiben einer Anlage und Vorrichtung zur Beleimung von Spänen, Fasern oder faserähnlichem Material im Zuge der Herstellung von Werkstoffplatten
CN102785278B (zh) * 2012-07-20 2014-07-09 宁波大世界家具研发有限公司 一种木纤维复合材料整体式木门的制造设备
ITMO20120248A1 (it) * 2012-10-16 2014-04-17 Imal Srl Dispositivo e metodo per l'iniezione di fluidi all'interno di un flusso di materiale incoerente.
DE102015206548A1 (de) 2015-04-13 2016-10-13 Lechler Gmbh Sprühanordnung und Verfahren zum Betreiben einer Sprühanordnung
DE202016101394U1 (de) 2016-03-14 2017-05-17 Dieffenbacher GmbH Maschinen- und Anlagenbau Strahlpumpe zum Auflockern und Vereinzeln von Holzfasern mit zeitgleicher Benetzung der Holzfasern mit Bindemittelfluid, sowie Anlage zur Benetzung und/oder Vorbenetzung von Holzfasern mit einem Bindemittelfluid
DE102016104563B3 (de) * 2016-03-14 2017-08-03 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren und Strahlpumpe zum Auflockern und Vereinzeln von Holzfasern mit zeitgleicher Benetzung der Holzfasern mit Bindemittelfluid, sowie Anlage zur Benetzung und/oder Vorbenetzung von Holzfasern mit einem Bindemittelfluid

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Also Published As

Publication number Publication date
EP0728562A3 (fr) 1997-03-19
EP0728562A2 (fr) 1996-08-28
US5827566A (en) 1998-10-27
DE19506353A1 (de) 1996-08-29
DE59609274D1 (de) 2002-07-11
CA2170207A1 (fr) 1996-08-24

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