EP1747865B1 - Méthode et dispositif pour la fabrication de panneaux lignocellulosiques - Google Patents

Méthode et dispositif pour la fabrication de panneaux lignocellulosiques Download PDF

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Publication number
EP1747865B1
EP1747865B1 EP20060015368 EP06015368A EP1747865B1 EP 1747865 B1 EP1747865 B1 EP 1747865B1 EP 20060015368 EP20060015368 EP 20060015368 EP 06015368 A EP06015368 A EP 06015368A EP 1747865 B1 EP1747865 B1 EP 1747865B1
Authority
EP
European Patent Office
Prior art keywords
steam
scattering
particle
nozzles
particle stream
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.)
Not-in-force
Application number
EP20060015368
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German (de)
English (en)
Other versions
EP1747865A3 (fr
EP1747865A2 (fr
Inventor
Gernot Dr. Von Haas
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 GmbH Maschinen und Anlagenbau
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Dieffenbacher GmbH Maschinen und Anlagenbau
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Publication of EP1747865A2 publication Critical patent/EP1747865A2/fr
Publication of EP1747865A3 publication Critical patent/EP1747865A3/fr
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Publication of EP1747865B1 publication Critical patent/EP1747865B1/fr
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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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres

Definitions

  • the invention relates to a method for the production of wood-based panels according to the preamble of claim 1 and an associated apparatus for carrying out the method according to claim 14.
  • the object of the present invention is to provide a method for preheating particles, especially fibers or chips, in a spreader to form a Pressgutmatte in the course of the production of wood-based panels, which makes it possible to avoid the disadvantages presented above and the mentioned possibility of temperature setting in the scattering stations with a minimum of effort to allow.
  • a device for carrying out the method is to be created which is able to work economically.
  • the object is achieved according to claim 1, characterized in that during the dropping of the particle stream from the scattering bin or in the scattering head of nozzles in the particle curtain water vapor at a temperature of 100 ° - 180 ° C, preferably 105 - 130 ° C for adjusting the humidity and the temperature of the particles is injected.
  • the solution for a device for carrying out the method according to claim 14 is that in the scattering machine between dosing bunker and scattering head and / or in the scattering head to baffles steam strips are mounted with steam nozzles over the entire width of the scattering head.
  • the use of nozzles achieves such a high vapor velocity that a particle flow of up to 30 cm in thickness is just penetrated.
  • the exit velocity of the steam from the nozzle is between 5 and 50 m / sec.
  • the exit velocity is selected as a function of the thickness of the particle flow and the spray angle.
  • flat jet nozzles are used, which form a complete steam curtain, through which the particles fall across the full width.
  • the spraying should take place after the particles leave the spreading hopper or the dosing hopper on their way to the spreading head.
  • the nozzles and the tube for supplying steam to the nozzles can be integrated into the baffles or mounted at a certain distance of 1 - 30 cm to the particle flow.
  • the spraying can also take place alternately or simultaneously into the particle flow from both sides. These arrangements allow a steam curtain to be formed into which the particles enter and the vapor losses described above not occur.
  • the steam jet should be directed at an angle of 20-160 °, preferably 90 ° to the particle flow. If too low an angle is chosen, the steam does not fully penetrate the particle flow and the heating is uneven.
  • the amount of steam is adjusted according to the selected preheating temperature as a function of the mass flow passing on the steam strip.
  • fibers are heated to heat a particle stream from 40 t / h of 40 ° to 50 ° C, a steam quantity of 320 kg / h with complete condensation of the injected steam needed, ie 0.8 kg / h of steam per 1 t / h of particulate material. Since a small part of the steam is not condensed and mixed with the air, about 380 kg / h are sprayed onto the particle stream by means of a steam strip.
  • the amount of steam supplied to the steam bar per unit time can be adjusted by means of a proportional steam valve or a pressure reducing valve.
  • Fluctuating particle temperatures in the pressed material mat which are usually caused by outside temperature differences, are often the cause of burst wood-based panels after a press.
  • the temperature of the particles in the pressed material mat can be measured and used to control the amount of steam or to adjust the valve position of the steam valve.
  • a constant particle temperature is obtained in front of a press, which significantly increases the production reliability in terms of bursting of the plates after the press and also allows further optimization of the pressing program.
  • the pressing speed can be increased at a constant particle temperature. This means that the press speed and the system capacity are increased not only by the increased particle temperature but also by more constant production conditions.
  • the particles of the cover layers should preferably be raised to a temperature higher than 60 ° C., preferably 80 ° C., while the particles of the middle layer are heated to a maximum of 60 ° C.
  • a homogeneous density profile with a uniform density across the plate cross section is also desired.
  • the middle layer is not preheated to a significantly higher temperature and the top layer or not heated to a maximum of 50 ° C.
  • the glued particle moisture must be lowered with increasing temperature increase, since the moisture of the particles increases due to the condensation of the steam. For each 1 ° C increase in temperature, the humidity must be reduced by 0.04 - 0.08%.
  • the steam supply pipe for the nozzles should be equipped with a condensate separator.
  • the use of slightly superheated steam prevents wet steam from escaping from the nozzles, which would lead to water spots on the plates.
  • a scattering machine 1 consists of a dosing bunker 2 with scattering head 3 arranged underneath.
  • the particle stream 6 is usually discharged across the width of the spreading head 3 in the dosing bunker 2, depending on the requirement of the wood-based material board to be produced by means of the discharge belt 13 and the discharge rollers 12 and into the scattering head promoted.
  • the particle stream 6 impinges on an adjustable guide flap 4, which directs the particle stream 6 in a targeted manner onto dividing rolls 5, which distribute the particle stream 6 in the scattering head 3.
  • the divided particle stream 6 is finally guided via guide plates 7 onto the orientation rollers 9.
  • Orientation rollers 9 deposit the particles oriented or not orientated on the forming belt 10, as required, and thus form the pressed material mat 11 or, if several are arranged one behind the other Spreading machines 1 also only one layer of a pressed material mat 11.
  • the pressed material mat 11 is then as quickly as possible in a press (not shown) pressed. This can be depending on the equipment a floor or continuously operating press for the production of wood-based panels.
  • steam strips 8 are arranged in the baffles 8, which inject steam into the past sweeping particle stream 6. It is not essential in the context of the invention whether the steam strips 8 are arranged in the upper or lower region of the baffles 7. To avoid stray errors, it is common to construct the baffles 7 so that caking or accumulation of particles, especially on the back, are avoided. It is up to the reading designer how to arrange or encapsulate the steam strips 8 in order to ensure smooth spreading. In a second embodiment according to FIG. 2 , which can also occur in combination with the first, are the steam strips 8 directly above the dividing rollers 5, and below the Dosierbunkers 2.
  • the bed of particle flow 6 does not necessarily take place from a Dosierbunker 2, but can also directly from a Blow-line or via other delivery variants for particles.
  • the particle stream 6 emerging from the dosing bunker 2 is vaporized at the moment by means of the steam strip 8 when it encounters the deflector 4.
  • the spraying takes place over the entire width of the particle stream 6 and can also take place from two sides, but parallel to the transport direction of the forming belt 10, in order to avoid scattering errors.
  • this has a temperature of 100 ° to 180 ° C, preferably from 105 to 130 ° C.
  • a control of the supplied amount of steam depending on the desired temperature of 40 ° - 80 ° C and carried out the particle throughput are, with the Pressgutmatte 11 should leave the spreader and optimally is pressed immediately afterwards.
  • the spraying can be carried out at a speed of 5 to 50m / s.
  • the particle flows 6 of the cover layers must be at 70 ° -80 ° C. and the particle flows 6 of the cover layers Middle layers are preheated to 50 ° - 60 ° C.
  • the particle flows 6 of the outer layers must be preheated to 50 ° C and the particle streams 6 of the middle layers to 70 ° - 80 ° C.
  • the steam nozzles 15 may be formed as flat jet nozzles, be arranged close to tight and in several rows. In this case, it is possible to set the rows of the steam nozzles 15 at different angles to the particle stream 6 in order to increase the efficiency of the steam injection. In this case, it is of course possible to form the steam bar 8 as a tube or as a square, wherein the steam bar 8 should always have means for condensate removal 14 or a condensate bag is attached.
  • the optimum arrangement of the steam strips 8 to the particle flow is 1 to 20 cm away, the steam strip 8 can of course also be designed to be pivotable.

Landscapes

  • 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 (23)

  1. Procédé pour la fabrication de panneaux de matériau à base de bois à partir d'un mélange de particules fines, plus grossières et allongées contenant de la lignocellulose et/ou de la cellulose et additionnées de liants, telles que de la sciure, des fibres ou des copeaux allongés, composés d'une ou plusieurs couches, les couches étant dispersées à partir de postes de dispersion sur une bande de formage continue en mouvement pour former une nappe de matière à presser qui est ensuite amenée à sa forme définitive et durcie par application de pression et de chaleur au moyen d'un pressage, caractérisé en ce que pendant la chute d'un flux de particules hors d'une trémie de dispersion ou d'une tête de dispersion de la machine de dispersion, de la vapeur d'eau à une température de 100°C à 180°C, de préférence de 105°C à 130°C, est injectée à partir de buses dans le flux de particules afin d'ajuster l'humidité et la température des particules.
  2. Procédé selon les revendications 1, caractérisé en ce que la quantité de vapeur amenée est régulée en fonction de la température de préchauffage souhaitée de 40°C à 80°C et du débit de particules.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que pour une tonne/heure de particules en circulation, on utilise 0,8 à 1,5 kg/h de vapeur pour une augmentation de la température d'un degré.
  4. Procédé selon les revendications 1 à 3, caractérisé en ce que l'humidité après encollage est abaissée avant l'injection de vapeur de 0,04 à 0,08 % par 1 °C.
  5. Procédé selon les revendications 1 à 4, caractérisé en ce que la vapeur est injectée sous un angle de 20° à 160° par rapport au flux de particules tombant.
  6. Procédé selon les revendications 1 à 5, caractérisé en ce que l'injection de la vapeur est effectuée à une vitesse de 5 à 50 m/s.
  7. Procédé selon les revendications 1 à 6, caractérisé en ce que l'injection de la vapeur dans le flux de particules est effectué entre la trémie de dispersion et l'amont de l'entrée dans la tête de dispersion sur toute la largeur du flux de particules.
  8. Procédé selon les revendications 1 à 7, caractérisé en ce que l'injection dans le flux de particules a lieu au niveau des rouleaux répartiteurs et/ou des tôles de guidage dans la tête de dispersion d'une machine de dispersion.
  9. Procédé selon les revendications 1 à 8, caractérisé en ce que l'injection est effectuée par les deux côtés du flux de particules.
  10. Procédé selon les revendications 1 à 9, caractérisé en ce que l'injection n'a lieu dans la tête de dispersion que parallèlement dans le sens d'avancement de la bande de formage ou en sens inverse.
  11. Procédé selon les revendications 1 à 10, caractérisé en ce que des paramètres différents sont réglés dans les machines de dispersion selon si les particules sont utilisées pour des couches intermédiaires ou de couverture d'une nappe de matière à presser multicouche.
  12. Procédé selon la revendication 11, caractérisé en ce qu'en vue d'obtenir un profil de densité avec des densités élevées dans les couches de couverture et une faible densité dans les couches intermédiaires, les flux de particules des couches de couverture sont préchauffés à 70°- 80°C et les flux de particules des couches intermédiaires à 50°-60°C.
  13. Procédé selon la revendication 11, caractérisé en ce qu'en vue d'obtenir un profil de densités uniforme, les flux de particules des couches de couverture sont préchauffés à 50°C et les flux de particules des couches intermédiaires à 70°- 80°C.
  14. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, avec des postes de dispersion à partir desquels des couches sont dispersées sur une bande de mise en forme continue en mouvement pour former une nappe de matière à presser, et des presses qui amènent la nappe de matière à presser à une forme finale en utilisant une pression et de la chaleur, le flux de particules tombant d'une trémie de dispersion par une tête de dispersion dans la machine de dispersion, caractérisé en ce que des conduites de vapeur (8) avec des buses de vapeur (15) sont disposées entre la trémie de dosage (2) et la tête de dispersion (3) et/ou dans la tête de dispersion (3) sur des tôles de guidage (7) sur toute la largeur de la tête de dispersion (3).
  15. Dispositif selon la revendication 14, caractérisé en ce que les buses de vapeur (15) sont conçues comme des buses plates.
  16. Dispositif selon la revendication 14 ou 15, caractérisé en ce que la conduite de vapeur (8) est construite comme un tube ou un carré.
  17. Dispositif selon les revendications 14 à 16, caractérisé en ce que la conduite de vapeur (8) présente des moyens pour l'évacuation du condensat (14) et en ce qu'une poche à condensat est mise en place.
  18. Dispositif selon les revendications 14 à 17, caractérisé en ce que la conduite de vapeur (8) est disposée à une distance de 1 à 20 cm du flux de particules.
  19. Dispositif selon les revendications 14 à 18, caractérisé en ce que les buses de vapeur (15) sont disposées sur la largeur de la conduite de vapeur (8) à une distance suffisamment faible pour que la vapeur forme un jet de vapeur cohérent, vu sur la largeur.
  20. Dispositif selon les revendications 14 à 19, caractérisé en ce qu'en vue du réglage de l'angle d'injection, la conduite de vapeur (8) est disposée de façon pivotante.
  21. Dispositif selon les revendications 14 à 20, caractérisé en ce que les buses de vapeur (15) sont disposées en plusieurs rangées sur la conduite de vapeur (8).
  22. Dispositif selon la revendication 21, caractérisé en ce que les rangées des buses de vapeur (15) sont disposées sous des angles différents par rapport au flux de particules (6).
  23. Dispositif selon les revendications 14 à 22, caractérisé en ce qu'en vue du réglage de la quantité de vapeur par unité de temps, il est prévu une soupape proportionnelle de vapeur ou un détendeur proportionnel.
EP20060015368 2005-07-25 2006-07-24 Méthode et dispositif pour la fabrication de panneaux lignocellulosiques Not-in-force EP1747865B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510035244 DE102005035244A1 (de) 2005-07-25 2005-07-25 Verfahren und Vorrichtung zur Herstellung von Holzwerkstoffplatten

Publications (3)

Publication Number Publication Date
EP1747865A2 EP1747865A2 (fr) 2007-01-31
EP1747865A3 EP1747865A3 (fr) 2013-02-20
EP1747865B1 true EP1747865B1 (fr) 2014-05-07

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Application Number Title Priority Date Filing Date
EP20060015368 Not-in-force EP1747865B1 (fr) 2005-07-25 2006-07-24 Méthode et dispositif pour la fabrication de panneaux lignocellulosiques

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EP (1) EP1747865B1 (fr)
DE (1) DE102005035244A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007041196A1 (de) 2007-08-31 2009-03-05 Dieffenbacher Gmbh + Co. Kg Streumaschine zur Bildung einer Pressgutmatte oder einer Schicht derselben im Zuge der Herstellung von Holzwerkstoffplatten und ein Verfahren zum Betreiben einer Streumaschine
DE102016110073A1 (de) * 2016-05-31 2017-11-30 Dieffenbacher GmbH Maschinen- und Anlagenbau Streuvorrichtung und Verfahren zum kontinuierlichen Aufbringen von Streugut auf ein Formband
CN112706252A (zh) * 2020-12-28 2021-04-27 广西三威林产工业有限公司 用于无醛纤维板生产的纤维预加热风选***

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH445107A (de) * 1965-07-17 1967-10-15 Becker & Van Huellen Verfahren und Vorrichtung zur Herstellung endloser Spanplattenbahnen
DE10161341A1 (de) * 2001-12-13 2003-06-26 Dieffenbacher Gmbh Maschf Bedampfungsvorrichtung für Preßgutmatten
DE10207573C1 (de) * 2002-02-22 2003-07-03 Siempelkamp Masch & Anlagenbau Anlage zum Herstellen von Spanplatten, Faserplatten o. dgl. Holzwerkstoffplatten aus Pressgutmatten
DE10247412C5 (de) * 2002-10-11 2010-07-01 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage zum Beleimen von Fasern für die Herstellung von Faserplatten, insbesondere MDF-Platten und dergleichen Holzwerkstoffplatten
DE10314623B3 (de) * 2003-04-01 2005-01-13 Kronotec Ag Vorrichtung und Verfahren zur Herstellung von Holzwerkstoffplatten
DE10315922A1 (de) * 2003-04-08 2004-11-04 Metso Paper Inc. Verfahren und Anlage zur Herstellung von Plattenwerkstoffen

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Publication number Publication date
EP1747865A3 (fr) 2013-02-20
DE102005035244A1 (de) 2007-02-01
EP1747865A2 (fr) 2007-01-31

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