EP0522309B1 - Procédé de fabrication de panneaux de fibres à partir des agglomérés de particules de bois et d'isocyanate comme liant - Google Patents

Procédé de fabrication de panneaux de fibres à partir des agglomérés de particules de bois et d'isocyanate comme liant Download PDF

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Publication number
EP0522309B1
EP0522309B1 EP92109999A EP92109999A EP0522309B1 EP 0522309 B1 EP0522309 B1 EP 0522309B1 EP 92109999 A EP92109999 A EP 92109999A EP 92109999 A EP92109999 A EP 92109999A EP 0522309 B1 EP0522309 B1 EP 0522309B1
Authority
EP
European Patent Office
Prior art keywords
fibers
isocyanate
wood particles
binder
fiberboard
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
EP92109999A
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German (de)
English (en)
Other versions
EP0522309A1 (fr
Inventor
Wilhelm Oldemeyer
Werner Sanders
Gert Teuber
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.)
Glunz AG
Original Assignee
Glunz AG
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 Glunz AG filed Critical Glunz AG
Publication of EP0522309A1 publication Critical patent/EP0522309A1/fr
Application granted granted Critical
Publication of EP0522309B1 publication Critical patent/EP0522309B1/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 producing fiberboard from lumpy wood particles and isocyanate as a binder with the method steps mentioned in the preambles of claims 1 and 2.
  • the fiberboard in question is medium-density fiberboard, in which wood chips and cheap wood assortments can be used to make better use of wood.
  • fiberboard itself is comparable to chipboard, but it has a uniform density and structural fineness over the entire thickness of the board. In addition, they have a smooth, closed surface, which enables perfect processing and a large number of finishing techniques.
  • the wood particles are boiled in a cooker under excess water vapor pressure and transferred to a processor in which the wood particles are broken down into hot and wet fibers.
  • the hot and wet fibers pass from the conditioner into a separator via a blowing device having a blowing passage.
  • the cooker, the conditioner and the blow passage are under pressure, for example 8 bar.
  • the temperatures of the hot fibers are in the order of 150 to 160 ° C.
  • At the end of the blow to the separator there is a pressure release, i.e. an expansion, because the separator is under normal pressure.
  • an organic polyisocyanate agent of whatever type is to be applied to the hot and wet fibers from the processing stage in the blow passage, that is to say in an area where there is overpressure.
  • the task of the isocyanate is thus before Expansion.
  • such a polyisocyanate is to be used which forms an emulsion in water and is additionally self-releasing so that hardening phenomena in the blow aisle are avoided.
  • a swirling and homogeneous distribution of the isocyanate on the hot and wet fibers advantageously takes place, so that on the one hand the formation of lumps is avoided when using the special isocyanates and no glue stains occur on the finished fiberboard, as is advantageous for all binders added in the blowing passage applies.
  • the invention has for its object to provide a process for the production of fiberboard glued with isocyanate of the type described at the outset, in which there is neither the risk of glue stains nor any noteworthy pre-curing of the isocyanate.
  • this is achieved in a first solution in that the fibers are transferred from the blowing passage directly into the subsequent heating gas mixing dryer and that the isocyanate is sprayed onto the fibers in an inlet area of the fiber-steam stream in the heating gas mixing dryer, which is jacket-like from the heating gas stream is surrounded.
  • the object is achieved according to the invention in that the isocyanate is sprayed onto the fibers in the cyclone separator in the inlet region of the fiber-steam stream after the end of the blowing cycle.
  • the fibers are in a state of increased movement at the time the isocyanate is applied at a considerable speed, so that a finely divided application is possible and a lump formation is counteracted from the outset.
  • the further movement of the fibers mixed with the binder in intermediate conveyor systems, but especially in the dryer is used to complete the even and fine distribution of the binder on the fibers.
  • Pre-curing of the isocyanate is advantageously avoided, not only because the isocyanate is applied to comparatively colder and drier fibers, but also because, as tests have shown, the temperature increase in the dryer and the very short residence time present Fibers do not lead to any significant pre-curing.
  • the isocyanate can be sprayed in particular onto the fibers under normal pressure, that is to say after the expansion has taken place. At this point, the temperature reduction on the fibers caused by the evaporation of the water has had a full effect, so that the sprayed isocyanate is in any case no longer heated to such temperature ranges as is the case when it is added in the blow passage.
  • the isocyanate can be sprayed on immediately after the end of the blowing cycle and during the expansion phase.
  • the isocyanate is chosen at which the fibers have particularly high speeds.
  • the static pressure in the cooker, conditioner and in the blowing aisle is reduced and converted into dynamic pressure. This advantageously results in very short contact times between the isocyanate squeezed out of the nozzles and the fibers flying past at high speed. It is also possible for the isocyanate to be sprayed on at the point of the highest flow rate of the fibers.
  • the isocyanate is expediently sprayed on using a high pressure in the isocyanate. This includes pressures up to or in the order of 20 bar.
  • a cooker 1 and a conditioner 2 is shown schematically.
  • a blow passage 3 leads from the conditioner 2 to a separator 4.
  • the separator 4 does not have one shown cell lock a conveyor 5 downstream.
  • the lumpy wood particles reach the pressurized cooker 1 by means of a corresponding introduction device.
  • steam is introduced into the cooker 1 according to arrow 10 under pressure.
  • the wood particles are softened in the cooker 1, which are then transferred to the conditioner 2.
  • the conditioner 2 can be provided with grinding disks or the like to enable the wood particles to be broken down into fine fibers.
  • the cooker 1, the conditioner 2 and the blow duct 3 are under positive pressure.
  • the blowing passage 3 ends in the separator 4, an expansion to normal pressure taking place at the end of the blowing passage 3, since ambient pressure prevails in the separator. Expansion causes water to evaporate. This water vapor is separated in the separator 4 and can be returned to the cooker 1 according to arrow 10.
  • the fibers With the evaporation of water, the fibers are cooled and the isocyanate is sprayed on according to arrow 11 in the separator 4 after the end of the blowing cycle 3, that is to say under normal pressure and at a reduced temperature of the fibers. However, the fibers are still in motion here, so that the finely divided spraying of the isocyanate is possible.
  • Via a conveyor 5 or directly from the separator 4 the fibers mixed with the isocyanate enter the dryer 6, in which further water vapor is separated.
  • the temperature of the fibers is increased here by the supply of hot air, the passage of the fibers through the dryer 6 is only comparatively short, so that any noteworthy precuring of the isocyanate is avoided.
  • the separator 8 the fibers and the drying air are separated from one another, and the fibers glued with isocyanate can, according to arrow 12, be fed directly to further processing into fiberboard, in particular the mat spreading machine.
  • the blow passage 3 is connected directly to the dryer 6.
  • a separator 4 thus ceases to exist.
  • the isocyanate as a binder is applied here in the region of the dryer 6 according to arrow 13, that is also after the end of the blowing aisle 3 and before the end of the dryer 6.
  • FIG. 3 shows a somewhat more concrete representation of a detail of the system according to FIG. 2.
  • the blow passage 3 ends here in a distribution head 14 within a riser of the dryer 6.
  • the fan 7 is accommodated in a suction housing, which also has a heating register 15.
  • a line 16 for the isocyanate ends in an annular nozzle arrangement 17, which is positioned relative to the distributor head 14 in the riser of the dryer 6, in such a way that the isocyanate is applied to the fibers emerging from the distributor head 14 with high kinetic energy.
  • the length of the riser of the dryer 6 is used in order to achieve a uniform distribution of the isocyanate and the avoidance of the glue stains due to the turbulence that occurs.
  • the water vapor and the hot air of the dryer are separated in the separators 8.
  • the fibers glued with isocyanate are discharged via rotary locks and fed to the further shaping stations for the fiberboard, which are not shown here.
  • FIG. 4 shows a detail when the isocyanate is sprayed in after the end of the blowing passage 3.
  • the end of the blowing passage 3 protrudes into the wall of a separator 4.
  • this wall of the separator 4 are also several over the scope of the Axle 18 of the blow duct 3 held nozzle holder 19 distributed, which are arranged in the interior of the separator 4 above.
  • nozzles 20 are arranged so as to be displaceable and lockable, with the aid of which the isocyanate is sprayed onto the expanding cone of the fibers emerging freely from the end of the blowing passage 3.
  • the spraying can also take place in the initial area of a dryer 6, as is illustrated in FIG. 3.

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)
  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (5)

  1. Procédé de fabrication de panneaux de fibres à partir de particules de bois en morceaux et d'isocyanate servant de liant, dans lequel les particules de bois sont chauffées sous une surpression de vapeur d'eau et sont fragmentées en fibres les fibres étant envoyées, par une opération de soufflage, sous expansion, dans un séchoir mixte à gaz chauds et y étant séchées, il est ensuite procédé au formage d'un mat sans insertion d'un réservoir à fibres de grande contenance, caractérisé en ce que les fibres passent directement de la voie de soufflage (3) dans le séchoir mixte à gaz chauds (6) s'y raccordant, et en ce que l'isocyanate est pulvérisé sur les fibres dans une zone d'entrée du courant de vapeur des fibres dans le séchoir mixte à gaz chauds (6) qui est entouré à la manière d'une enveloppe par le courant de gaz chauds.
  2. Procédé de fabrication de panneaux de fibres à partir de particules de bois en morceaux et d'isocyanate servant de liant, dans lequel les particules de bois sont chauffées sous une surpression de vapeur d'eau et sont fragmentées en fibres, les fibres étant acheminées par une opération de soufflage, sous expansion d'abord dans un séparateur à cyclone puis sont transférées dans un séchoir mixte à gaz chauds et y sont séchées, il est ensuite procédé au formage d'un mat sans insertion d'un réservoir à fibres de grande contenance, caractérisé en ce que l'isocyanate est pulvérisé sur les fibres après l'extrémité de la voie de soufflage (3), dans la zone d'entrée du courant de vapeur des fibres dans le séparateur à cyclone (4).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la pulvérisation de l'isocyanate s'effectue sur les fibres à la pression normale.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que la pulvérisation de l'isocyanate s'effectue au point de la vitesse d'écoulement maximale des fibres.
  5. Procédé selon une ou plusieurs des revendications 1 à 4, caractérisé en ce que la pulvérisation de l'isocyanate s'effectue par application d'une pression élevée de l'isocyanate.
EP92109999A 1991-07-10 1992-06-13 Procédé de fabrication de panneaux de fibres à partir des agglomérés de particules de bois et d'isocyanate comme liant Expired - Lifetime EP0522309B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4122842A DE4122842C2 (de) 1991-07-10 1991-07-10 Verfahren zur Herstellung von Faserplatten aus stückigen Holzpartikeln und Isocyanat als Bindemittel
DE4122842 1991-07-10

Publications (2)

Publication Number Publication Date
EP0522309A1 EP0522309A1 (fr) 1993-01-13
EP0522309B1 true EP0522309B1 (fr) 1995-05-24

Family

ID=6435837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109999A Expired - Lifetime EP0522309B1 (fr) 1991-07-10 1992-06-13 Procédé de fabrication de panneaux de fibres à partir des agglomérés de particules de bois et d'isocyanate comme liant

Country Status (12)

Country Link
US (1) US6197236B1 (fr)
EP (1) EP0522309B1 (fr)
JP (1) JPH06509032A (fr)
AT (1) ATE122954T1 (fr)
AU (1) AU653239B2 (fr)
CA (1) CA2112569C (fr)
DE (2) DE4122842C2 (fr)
DK (1) DK0522309T3 (fr)
ES (1) ES2074767T3 (fr)
NZ (1) NZ243475A (fr)
WO (1) WO1993001033A1 (fr)
ZA (1) ZA925127B (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506353A1 (de) * 1995-02-23 1996-08-29 Schenck Ag Carl Verfahren und Vorrichtung zum Benetzen mit einem Fluid
DE19515734A1 (de) * 1995-05-03 1996-11-07 Schenkmann & Piel Verfahrenste Verfahren zur Herstellung von Holzfasern
CA2168682A1 (fr) * 1995-06-02 1996-12-03 David M. Harmon Methode et dispositif permettant d'eviter l'obstruction de la canalisation de decharge dans la fabrication de produits composites a base de cellulose
DE19604575A1 (de) * 1996-02-08 1997-08-28 Glunz Ag Verfahren zur Herstellung von Span- oder Faserplatten
AT405038B (de) * 1996-08-27 1999-04-26 Funder Ind Ges M B H Verfahren zur aufbereitung von faserplattenabfällen
BR9907063A (pt) * 1998-08-05 2000-10-17 Fraunhofer Ges Forschung Processo para a produção de placas mdf
IE990100A1 (en) 1998-10-30 2000-05-03 Masonite Corp Method of making molded Composite articles
DE10247413B4 (de) * 2002-10-11 2009-05-07 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage zum Beleimen von Fasern für die Herstellung von Faserplatten, insbesondere MDF-Platten oder dergleichen Holzwerkstoffplatten
DE10356775A1 (de) * 2003-12-02 2005-07-07 Dieffenbacher Gmbh + Co. Kg Verfahren und Anlage zur Beleimung von Fasern und eine Faserbeleimungsvorrichtung
DE102005038734A1 (de) † 2005-08-16 2007-02-22 Michanickl, Andreas, Prof.Dr. Leichte Mehrschicht-Holzwerkstoffplatte
DE102007054123B4 (de) 2006-11-15 2012-03-15 Edmone Roffael Verfahren zur Herstellung von Holzfaserplatten mit verringerter Formaldehydemission, hoher Feuchtebeständigkeit und Hydrolyseresistenz der Verleimung
DE102008023007A1 (de) 2007-11-11 2010-06-02 Roffael, Edmone, Prof. Dr.-Ing. Verfahren zur Herstellung von Holzfaserplatten mit verringerter Formaldehydemission, hoher Feuchtebeständigkeit und Hydrolyseresistenz der Verleimung
CA2811696C (fr) * 2010-10-01 2017-07-04 Kronoplus Technical Ag Procede et appareil de collage de particules de bois
DE102015201464B4 (de) 2015-01-28 2016-10-20 Brav-O-Tech Gmbh Vorrichtung und Verfahren zum Beleimen von Partikeln
DE102015212798B4 (de) 2015-07-08 2017-02-02 Brav-O-Tech Gmbh Vorrichtung und Verfahren zum Benetzen von Partikeln

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3371137A (en) * 1968-02-27 Defibrator Ab Method in the manufacture of fiber board
DE2023659A1 (en) * 1970-05-14 1971-11-25 Holzwerk Becker Kg, 6728 Germersheim Dried raw material treatment to impregnate with a sprayable binder
US4209433A (en) * 1978-12-19 1980-06-24 The United States Of America As Represented By The Secretary Of Agriculture Method of bonding particle board and the like using polyisocyanate/phenolic adhesive
DE3143895C2 (de) * 1981-11-05 1985-01-17 Triangel Spanplatten KG, 3177 Sassenburg Verfahren und Vorrichtung zum Beleimen von teilchenförmigem Gut in Form von Spänen, Fasern o.dgl.
SU1021629A1 (ru) * 1981-12-29 1983-06-07 Всесоюзный Научно-Исследовательский Институт Деревообрабатывающей Промышленности Устройство дл осмолени древесного волокна
AT378729B (de) * 1982-04-05 1985-09-25 Baehre & Greten Verfahren zum herstellen von faserplatten
US4407771A (en) * 1982-04-26 1983-10-04 The Celotex Corporation Blow line addition of isocyanate binder in fiberboard manufacture
SE461962B (sv) * 1987-12-16 1990-04-23 Sunds Defibrator Ind Ab Saett och anordning foer framstaellning av fiberboardskivor
US5093058A (en) * 1989-03-20 1992-03-03 Medite Corporation Apparatus and method of manufacturing synthetic boards

Also Published As

Publication number Publication date
AU653239B2 (en) 1994-09-22
ZA925127B (en) 1993-04-28
ATE122954T1 (de) 1995-06-15
AU2194392A (en) 1993-02-11
CA2112569A1 (fr) 1993-01-21
US6197236B1 (en) 2001-03-06
EP0522309A1 (fr) 1993-01-13
DK0522309T3 (da) 1995-07-24
DE59202306D1 (de) 1995-06-29
ES2074767T3 (es) 1995-09-16
DE4122842C2 (de) 1993-11-18
JPH06509032A (ja) 1994-10-13
NZ243475A (en) 1993-11-25
CA2112569C (fr) 2003-09-30
WO1993001033A1 (fr) 1993-01-21
DE4122842A1 (de) 1993-01-14

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