EP0728562A2 - 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
EP0728562A2
EP0728562A2 EP96101889A EP96101889A EP0728562A2 EP 0728562 A2 EP0728562 A2 EP 0728562A2 EP 96101889 A EP96101889 A EP 96101889A EP 96101889 A EP96101889 A EP 96101889A EP 0728562 A2 EP0728562 A2 EP 0728562A2
Authority
EP
European Patent Office
Prior art keywords
wetting
particles
fluid
wetting zone
zone
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.)
Granted
Application number
EP96101889A
Other languages
German (de)
English (en)
Other versions
EP0728562A3 (fr
EP0728562B1 (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
Carl Schenck AG
Schenck Panel Production Systems 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 Carl Schenck AG, Schenck Panel Production Systems GmbH filed Critical Carl Schenck AG
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 become, for example, for gluing fibers in the course of the manufacture of plate-like Materials made of chips and fibers, in particular fiber boards (wood-based boards and building boards made of mineral and / or textile and / or synthetic fibers are used.
  • Such a method and such a device is known from DE-OS 31 43 895.
  • a gluing zone for gluing chips is shown there, which has a constant cross-section, a gluing nozzle being arranged within the cross-section through which the particles flow. It has been shown that with such an arrangement the problem of the formation of glue spots during the gluing of chip and fibrous particles cannot be mastered, since the known arrangement does not succeed in loosening or increasing the tendency towards the formation of fiber balls before the gluing seperate.
  • 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 characterized by a particularly uniform and fine distribution, with little mechanical outlay.
  • This object is achieved in the method according to the preamble of claim 1 in that the particle flow is loosened within the wetting zone by reducing the flow rate.
  • the object is further achieved by a device according to the preamble of claim 10 in that the nozzles are arranged in a region of the delivery line which has a diffuser-like cross-sectional widening.
  • the solution according to the invention by generating a turbulent flow during wetting achieves such a high resolution of the particle flow that individual particles can be wetted. A ball formation is surely avoided.
  • the sudden reduction in the flow velocity creates a particularly high level of turbulence in the wetting zone, so that any aggregations of particles that may be present are torn apart.
  • the particle resolution can be increased further if an accelerating section with a reduced diameter is connected upstream of the wetting zone, since this increases the effect of the sudden conversion of a fast laminar flow into a slow turbulent flow.
  • a particularly suitable field of application of the invention is the gluing of fibers, in particular wood fibers. Because the extremely high resolution of the particle stream, in this case a fiber stream, it is even possible to glue fibers that have already dried, which tend to form lumps or clumps, economically and evenly in the air stream. So far, because of the problematic ball formation, gluing with moist fibers carried out, which were then dried. The fiber drying after gluing has the major disadvantage that 5 to 15% of the amount of glue used is lost through pre-curing and volatilization, whereby it should also be noted that the proportion of formaldehyde proportional to the amount of glue pollutes the dryer exhaust air and causes complex environmental protection measures. The gluing of already dried fibers also has the advantage that the influence of the pH value on the resin is greatly reduced due to the lower moisture (5 to 12%).
  • steam can be injected into the material flow.
  • a weighing station for determining the throughput quantity actually present is provided in the method or in the device, which weighing station serves as an input variable for regulating the quantity of fluid to be sprayed and / or the fluid composition.
  • the walls of the wetting zone can be tempered.
  • the inner surface may be cooled below the dew point by cooling, thereby reliably preventing the glue from caking.
  • a particularly fine wettability is also favored by the fact that a station is provided for influencing the state of charge of the flowing particles, which in combination with a certain state of charge of the wetting fluid improves the connection between the fluid and the particles and thus prevents staining.
  • the delivery line is fed with a preheated air stream, the air temperature being below 100 o C, preferably between about 50 and 70 o C, a more uniform particle moisture content, especially with wood fibers, can be achieved; it is also possible to glue in a second dryer stage and it is possible to shorten the pressing times even without adding steam when producing wood fiber boards.
  • the binder temperature should be below 80 o C, especially around 40-60 o C. This measure makes it possible to work with a smaller proportion of dilution water, which in turn can save dryer performance. This also enables binders with a higher proportion of solid resin to be used. This binder is less absorbed by the particles, which avoids the so-called "sagging". As a result of the heating, even without dilution, the binder viscosity remains in an area in which optimal atomization can take place through the nozzles.
  • FIG. 1 shows a schematic overview of the use of the invention for fiber gluing in the course of the production of fiberboard
  • FIG. 2 shows a section of the conveyor line containing the device according to the invention.
  • Figure 1 shows a block diagram of a section of a plant for producing wood-based panels from wood fibers or, for example, MDF boards from wood fibers.
  • the previously processed fibers are first fed to a dryer 1, from where they reach a fiber bunker 3 by means of air transport 2.
  • a moisture measurement 4 now takes place, the output signal of which controls the dryer 1.
  • a mass determination station 5 which can be designed as a belt scale or as a mass flow measuring device.
  • the gluing nozzle is connected to a high-pressure pump 6a, which is fed from a storage container 6b becomes.
  • the glued fibers pass through the classifier 7 and are then pneumatically (air transport 8) fed to the litter bin 9, which is assigned to the forming station 10. There the glued fibers are sprinkled into one 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.
  • a plurality of glueing nozzles 24, evenly distributed on the circumference, are arranged such that all fibers flowing past are equally wetted by the sprayed-in glue mist.
  • the spray cone of each glue nozzle and its orientation ⁇ are provided such that they can be adjusted with respect to the horizontal central axis of the delivery line.
  • the gluing nozzles 24 are designed as return nozzle lances known per se, which ensure that regardless of the flow rate changing over time, a uniformly fine spray mist is always generated.
  • the diffuser section is made of high-quality, pore-tight and polished material to prevent glue deposits.
  • the diffuser section is surrounded by a plurality of cooling tube windings 25 with a coolant inlet 26 and a coolant outlet 27.
  • the lining could also be done with a double film, through which a heat transfer liquid can then 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 gluing can take place at room temperature, as a result of which the amount of glue to be used per fiber quantity can be set to an economically advantageous low value. It is also possible to use binders which are based on isocyanate and which, in conventional gluing, are sensitive to moisture and temperature are not suitable.
  • ionizing rods projecting into the conveying line are arranged, with which the electrical charge state of the fibers can be influenced. In conjunction with an opposite charge state of the glue, this increases the gluing quality and the efficiency.
  • steam injectors are also provided in the delivery line in order to be able to regulate the fiber moisture exactly.
  • the delivery line 20, the reducer 21, the intermediate tube 22 and the diffuser section 23 can also have a polygonal cross-sectional shape instead of the rotationally symmetrical cross-sections described.
  • the diffuser section 23 and / or the reducer 21 need not necessarily have the streamlined course described, but cross-sectional jumps or ramps can also be used.

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

Family

ID=7754865

Family Applications (1)

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)

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

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930800A1 (de) * 1998-08-05 2000-02-17 Fraunhofer Ges Forschung Verfahren zur Herstellung von MDF-Platten
DE10059881A1 (de) * 2000-12-01 2002-06-20 Fraunhofer Ges Forschung Anlage zur Faseraufbereitung
DE10153593A1 (de) * 2001-11-02 2003-05-22 Fritz Egger Gmbh & Co Unterrad Verfahren und Vorrichtung zum Benetzen von Holzfasern mit einem Bindemittelfluid
EP1504865A2 (fr) * 2003-08-05 2005-02-09 Maschinenfabrik J. Dieffenbacher GmbH & Co. Procédé et dispositif pour enrober des matériaux coulant avec un liant
WO2005039842A1 (fr) 2003-10-07 2005-05-06 Schenkmann-Piel Engineering-Gmbh Procede de production de panneaux de fibres a partir de fibres de bois
US7094309B2 (en) 2000-08-11 2006-08-22 Fritz Schneider Flakeboard Company Limited Process and device for gluing dried fibers designated for the production of fiberboards
EP2179826A1 (fr) * 2008-10-23 2010-04-28 Kronotec Ag Procédé et installation de fabrication de matières dérivées du bois
EP2431144A1 (fr) 2010-09-15 2012-03-21 Kronotec AG Procédé et dispositif destinés au collage humide de fibres en bois
EP2563558A1 (fr) 2010-04-30 2013-03-06 Imal S.R.L. Appareil pour injecter des composants chimiques dans un flux de bois en vrac
CN103459107A (zh) * 2011-04-13 2013-12-18 迪芬巴赫机械工程有限公司 材料板制造中运行胶合碎屑、纤维或类似纤维的材料的设备和装置的方法

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US6902125B2 (en) 2000-05-24 2005-06-07 Fritz Schneider Process and device for disintegrating irregularities in flows of wood fibres
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
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
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1632450A1 (de) * 1968-02-10 1970-12-10 Draiswerke Gmbh Vorrichtung zum kontinuierlichen Mischen relativ kleiner Mengen einer feinteiligen Komponente mit einem durch einen Luftstrom bewegten Traegerstoff
US4116163A (en) * 1976-11-26 1978-09-26 Peter Fahrni Apparatus to coat a flowing mass of particulate material
DE3143895A1 (de) * 1981-11-05 1983-05-11 Triangel Spanplatten KG, 3177 Sassenburg Verfahren und vorrichtung zum beleimen von teilchenfoermigem gut, insbesondere von spaenen
US5064689A (en) * 1989-03-20 1991-11-12 Weyerhaeuser Company Method of treating discontinuous fibers

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DE2602454C3 (de) * 1976-01-23 1988-09-29 Luco-Sprühmisch-Technic GmbH, 6474 Ortenberg Vorrichtung zur Durchführung des Verfahrens nach Patent 26 60 533
JP2934268B2 (ja) * 1989-12-28 1999-08-16 フクビ化学工業株式会社 粉体の表面被覆方法とその装置
DE4122842C2 (de) * 1991-07-10 1993-11-18 Glunz Ag Verfahren zur Herstellung von Faserplatten aus stückigen Holzpartikeln und Isocyanat als Bindemittel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1632450A1 (de) * 1968-02-10 1970-12-10 Draiswerke Gmbh Vorrichtung zum kontinuierlichen Mischen relativ kleiner Mengen einer feinteiligen Komponente mit einem durch einen Luftstrom bewegten Traegerstoff
US4116163A (en) * 1976-11-26 1978-09-26 Peter Fahrni Apparatus to coat a flowing mass of particulate material
DE3143895A1 (de) * 1981-11-05 1983-05-11 Triangel Spanplatten KG, 3177 Sassenburg Verfahren und vorrichtung zum beleimen von teilchenfoermigem gut, insbesondere von spaenen
US5064689A (en) * 1989-03-20 1991-11-12 Weyerhaeuser Company Method of treating discontinuous fibers

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000007785A1 (fr) * 1998-08-05 2000-02-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Procede de production de panneaux de fibres de moyenne densite
DE19930800A1 (de) * 1998-08-05 2000-02-17 Fraunhofer Ges Forschung Verfahren zur Herstellung von MDF-Platten
US7094309B2 (en) 2000-08-11 2006-08-22 Fritz Schneider Flakeboard Company Limited Process and device for gluing dried fibers designated for the production of fiberboards
DE10059881A1 (de) * 2000-12-01 2002-06-20 Fraunhofer Ges Forschung Anlage zur Faseraufbereitung
US6984266B2 (en) 2000-12-01 2006-01-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Fiber preparation system
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
DE10153593A1 (de) * 2001-11-02 2003-05-22 Fritz Egger Gmbh & Co Unterrad Verfahren und Vorrichtung zum Benetzen von Holzfasern mit einem Bindemittelfluid
EP1504865A2 (fr) * 2003-08-05 2005-02-09 Maschinenfabrik J. Dieffenbacher GmbH & Co. Procédé et dispositif pour enrober des matériaux coulant avec un liant
EP1504865A3 (fr) * 2003-08-05 2005-05-04 Maschinenfabrik J. Dieffenbacher GmbH & Co. Procédé et dispositif pour enrober des matériaux coulant avec un liant
WO2005039842A1 (fr) 2003-10-07 2005-05-06 Schenkmann-Piel Engineering-Gmbh Procede de production de panneaux de fibres a partir de fibres de bois
EP2179826A1 (fr) * 2008-10-23 2010-04-28 Kronotec Ag Procédé et installation de fabrication de matières dérivées du bois
EP2563558A1 (fr) 2010-04-30 2013-03-06 Imal S.R.L. Appareil pour injecter des composants chimiques dans un flux de bois en vrac
EP2563558B1 (fr) 2010-04-30 2018-06-20 Imal S.R.L. Appareil pour injecter des composants chimiques dans un flux de bois en vrac
EP2431144A1 (fr) 2010-09-15 2012-03-21 Kronotec AG Procédé et dispositif destinés au collage humide de fibres en bois
WO2012034646A1 (fr) 2010-09-15 2012-03-22 Kronotec Ag Procédé et dispositif d'encollage humide de fibres de bois
US9114577B2 (en) 2010-09-15 2015-08-25 Kronotec Ag Method and device for the wet gluing of wood fibres
CN103459107A (zh) * 2011-04-13 2013-12-18 迪芬巴赫机械工程有限公司 材料板制造中运行胶合碎屑、纤维或类似纤维的材料的设备和装置的方法
CN103459107B (zh) * 2011-04-13 2016-02-03 迪芬巴赫机械工程有限公司 材料板制造中胶合碎屑和/或纤维的设备和运行设备的方法

Also Published As

Publication number Publication date
EP0728562A3 (fr) 1997-03-19
US5827566A (en) 1998-10-27
EP0728562B1 (fr) 2002-06-05
DE19506353A1 (de) 1996-08-29
DE59609274D1 (de) 2002-07-11
CA2170207A1 (fr) 1996-08-24

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