EP0448657B1 - Procede d'extrusion a plat pour la fabrication de materiaux en bois lies par un produit inorganique ou organique, en particulier les panneaux stratifies - Google Patents

Procede d'extrusion a plat pour la fabrication de materiaux en bois lies par un produit inorganique ou organique, en particulier les panneaux stratifies Download PDF

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Publication number
EP0448657B1
EP0448657B1 EP90913063A EP90913063A EP0448657B1 EP 0448657 B1 EP0448657 B1 EP 0448657B1 EP 90913063 A EP90913063 A EP 90913063A EP 90913063 A EP90913063 A EP 90913063A EP 0448657 B1 EP0448657 B1 EP 0448657B1
Authority
EP
European Patent Office
Prior art keywords
press
belts
batch
shaft
discharge
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
EP90913063A
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German (de)
English (en)
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EP0448657A1 (fr
Inventor
Volker Thole
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Priority to AT90913063T priority Critical patent/ATE102538T1/de
Publication of EP0448657A1 publication Critical patent/EP0448657A1/fr
Application granted granted Critical
Publication of EP0448657B1 publication Critical patent/EP0448657B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • 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
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/526—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement by delivering the materials on a conveyor of the endless-belt type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length

Definitions

  • the invention relates to a method for producing organically bound wood-based materials and to a device for carrying it out.
  • a feed device for wood chips to a vertical extrusion press is known.
  • the bulk material is compressed perpendicular to its transport direction due to the narrowing of the feed zone.
  • the glued wood chips are fed in via a storage container, which is arranged above the press.
  • the glued wood chips are simply poured into the extrusion press. Then they pass through a conically tapering zone and a subsequent, preferably heated zone in which the press belts run parallel to one another.
  • the extrusion press intended for this is arranged vertically. At the exit of the press, which also runs vertically, the finished wood materials are removed. It is the production of organically bound wood materials.
  • the length of a holding unit required to maintain the dimension of the setting plates, i.e. A calibration press therefore results from the total hydration period and is directly related to the start of hydration. The earlier the start of hydration can begin, the shorter the calibration press can be executed, or the higher the feed rate can be selected. For scattering stations arranged one behind the other, there are limits to the rapid start of hydration for design reasons, i.e. the hydration starts later, the total hydration takes longer and the calibration unit also has to be carried out longer. The usual press lengths would be about 50m.
  • extrusion processes are also known in which the pressing pressure is exerted parallel to the plate plane in such a way that the wood chips are continuously pressed through a heated strand or channel with a rectangular or differently shaped cross section and the wood chipboard is formed in the process.
  • This process is a so-called Okal process, (in e.g. Franz Kollmann, Holzspannwerkstoffe, page 5 / 9ff).
  • the chips are metered into a vertical press channel and compressed by a cyclically working stamp. Wander through the chips compacted in this way a heated molding channel, the length of which is so determined that the chips are glued sufficiently well.
  • the pressing times are relatively short, since the chips are glued together on the surface due to the heat development.
  • the strength thus achieved means that the setting process need not proceed to the middle of the plate.
  • the amount of heat stored on the plate surface is sufficient to cause the plate to bond to the plate core after leaving the press.
  • an additional device, a stamp has to be used, that the friction between the lining of the channel and the fleece sometimes reaches higher values than desired, and the chip orientation of the plates produced in the Okal process is vertical runs to the plate level, which results in low bending strength of the plates produced.
  • the object of the invention is to design a generic method and the device required to carry out the method so that the system can be made very compact and short while at the same time achieving high bending strength of the plates produced.
  • the mixing and spreading units are arranged in such a way that a simultaneous input of the batch (s) into the shaft is ensured.
  • the mixing and spreading units are preferably arranged in parallel or one above the other. It follows that, particularly in the production of multi-layer. Plates, in contrast to an arrangement of the mixing and spreading units one behind the other, the hydration can be used for all layers at the same time. In the case of inorganic binders, in particular gypsum, the hydration begins with the addition of the water of hydration. If the hydration starts quickly after the addition of all the necessary batches, for example in the production of multi-layer plates of various components, it is completed more quickly.
  • the hydration process has a direct impact on the process control: Either the subsequent calibration device can be made much shorter or the displacement speed can be selected higher.
  • the economic viability of such a process is very high.
  • the high flexural strength of the chipboard produced is achieved according to the present invention in that the nonwoven is compressed above the board level. Due to the conical design of the shaft formed by the rotating press belts or press plate belts, the fleece is compacted in the vertical section of the press. The compression is essential for chip orientation.
  • the chips / fibers can be pre-oriented by pre-compaction in the board level. The orientation remains the stronger, the higher the cohesion of the batch is and the smaller the drop height can be chosen.
  • the subsequent compaction over the plate level significantly supports the alignment of the chips in the plate level, since the individual chips try to offer the least resistance to the pressing pressure.
  • This chip orientation ensures a high bending strength perpendicular to the plate level.
  • a section adjoins the conically tapering shaft section in which the press belts or press plate belts run parallel to one another and are at a distance from one another which corresponds to the thickness of the finished plate strand.
  • the fleece is cured in the subsequent calibration device.
  • the inventive method can also be used to produce materials with a spatial shape. This can e.g. by using a divided press belt, which is adjustable in segments. The process can be effectively supported by pouring the fleece into the desired shape.
  • the angle of inclination and the distance between the press parts are variable.
  • the press parts can be equipped with heat supply or heat dissipation devices. The cooling of the press parts then makes sense if the solubility of dihydrate to water is to be increased during the process.
  • An alternating feed of the press belts or the press plate belts supports the pulling behavior of the fleece into the press.
  • the ejection devices are arranged so as to oscillate around its center line.
  • the batches can be sprinkled on the press parts and not directly in the shaft. This is particularly advantageous if multi-layer wood-based materials are to be manufactured.
  • a coating e.g. Film, already run into the shaft on both sides or on one side before compaction with the fleece. It is also possible to apply a coating in front of the calibration device, which then also supplies the required contact pressure.
  • the device according to the invention consists of mixing and / or spreading devices 1, a compression unit 2 and a calibration device 3.
  • the intensive mixers 4 and 5 the mixture of wood chips and binders for the cover layers, in the intensive mixer 6 that for the middle layer.
  • the spreading stations 7, 8, 9 have the task of following Discharge belts 10, 11, 12 form a uniform chip fleece.
  • the fleece formed is sprinkled into the conical shaft formed by the circumferential press belts 13 and 14, the respective layers being formed by the position of the discharge belts 10, 11, 12 (the arrows indicate the direction of movement of the discharge belts).
  • the rotating press belts 13 and 14, which are arranged around the rollers 15, have support rollers 16.
  • the length of the vertical section A of the conical shaft B can be dimensioned such that the deflection and thus the beginning of the horizontal section of the press, ie the parallel course of the press belts 13, 14 begins with the start of stiffening.
  • the batch entered into the conical shaft is deflected by the circulating, endless press belts 13 and 14 during transport.
  • the binder is hydrated in the following calibration device 3.
  • the separation between the compression and calibration device shown in this example is not absolutely necessary. These two sections can be enclosed by a single band.
  • the mixing and discharge device 1 can also consist of a mixer, e.g. Mixer 8 and only one discharge belt, e.g. Discharge belt 11, which oscillates around the center line of the shaft (A, B), exist.
  • a mixer e.g. Mixer 8
  • only one discharge belt e.g. Discharge belt 11, which oscillates around the center line of the shaft (A, B), exist.
  • FIG. 2 shows another variant of the device according to the invention, in which the press belts 14 and 13 are guided over two rollers 15 in their upper region adjoining the spreading and mixing devices 1, so that they form a surface for the spreading of the fleece .
  • This design is particularly suitable for the production of multilayer plates, in particular when a discharge belt 17 is additionally provided, by means of which a third component of the batch, which is scattered into the center of the shaft B, can be input.
  • the system is only started up when the vertical section of the press has been filled.
  • the press belts or press plate belts stand still until the shaft is filled.
  • the advantage of the method according to the invention is that the parallel arrangement of the mixing and spreading devices 1 allow binder to be processed with very short hydration times, so that the overall length of a calibration device 3 can be considerably reduced.
  • An estimate of the required length of a calibration device at a press belt speed of 5 m / min is given here as an example.
  • the length of the calibration device should therefore be 260 seconds (390 ./. 130 - 260).
  • the calibration time is 22m at a feed rate of 5m / p min. Compared to the usual calibration presses, the length of which is about 50 m, this means a considerable reduction in overall length with the same capacity. The economic viability of such a system is considerable.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

On présente un procédé d'extrusion à plat servant à fabriquer en particulier des panneaux stratifiés et une installation pour samise en ÷uvre. Le procédé se compose des étapes suivantes: introduction simultanée des mélanges par des dispositifs de mélange et d'épandage (1) dans un conduit vertical conique (A, B) formé de bbandes de pression en mouvement (13, 14); compactage du mélange sous l'action de la forme conique du conduit (B) puis passage dans une section (C) où les bandes de pression sont disposées parallèlement et présentent un écartement qui correspond à l'épaisseur du panneau extrudé fini; durcissement du mélange dans la section de calibrage (3) qui suit. L'installation pour la mise en ÷uvre du procédé est présentée également.

Claims (10)

  1. Procédé d'extrusion à plat pour la fabrication en continu de matériaux en bois, liés par un produit inorganique ou organique en particulier des panneaux stratifiés, selon lequel le mélange introduit dans une trémie conique verticale (A, B) formée par deux bandes continues de pressage est comprimé par la disposition conique puis à travers une presse dans laquelle les parties de presse sont parallèles entre elles avec un écart correspondant à l'épaisseur du matériau, procédé caractérisé en ce qu'on applique un mélange ou plusieurs mélanges à l'aide de dispositifs de mélange et/ou de dispersion (1) sur des bandes d'éjection (10, 11, 12) et on les introduit en même temps avec celles-ci de manière dosée dans la trémie (A, B) en fonction de la proportion de matière première contenue dans le matériau à fabriquer et après passage du segment vertical (A) de la presse et d'un second segment (C), horizontal, on fait durcir dans un dispositif de calibrage (3) en aval.
  2. Procédé selon la revendication 1, caractérisé en ce que le volume et/ou la distribution du mélange varie suivant la largeur des plaques.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on précomprime le ou les mélanges dispersés.
  4. Installation pour la mise en oeuvre du procédé selon la revendication 1 ou 2, comportant un dispositif de dosage du mélange et une trémie conique (A, B) verticale formée par des bandes continues de pressage et d'une presse en aval dans laquelle les parties de presse sont parallèles à une distance correspondant à l'épaisseur voulue pour la plaque, dispositif caractérisé en ce qu'il comporte des dispositifs de mélange et/ou de dispersion (1) qui appliquent un ou plusieurs mélanges sur les bandes d'éjection (10, 11, 12) et ces bandes sont prévues (parallèles ou superposées) pour assurer une seule introduction du ou des mélanges dans la trémie (A, B) et un second segment de la presse (C) est dévié et passe horizontalement à la suite du premier segment ou en étant raccordé à un dispositif de calibrage (3) par une zone de transition.
  5. Installation selon la revendication 4, caractérisée en ce que les parties de presse sont constituées par des bandes de pressage (13, 14) ou des bandes à plaques de pressage.
  6. Installation selon la revendication 4 ou 5, caractérisée en ce l'angle d'inclinaison et l'écartement d'une bande de pressage (13, 14) ou les bandes à plaques de pressage sont réglables.
  7. Installation selon la revendication 6, caractérisée en ce que les parties de presse sont équipées de dispositif d'alimentation ou d'évacuation de chaleur.
  8. Installation selon l'une ou plusieurs des revendications précédentes 4 à 7, caractérisee en ce que les parties de presse tournent de manière alternée.
  9. Installation selon la revendication 4, caractérisée en ce que pour la fabrication des plaques stratifiées, en liaison avec les bandes d'éjection (10, 11, 12) on dispose d'éléments de guidage de matière tels que des goulottes, des trémies ou moyens analogues.
  10. Installation selon la revendication 9, caractérisée en ce que pendant l'éjection du mélange dans la trémie (A, B), les dispositifs d'éjection (10, 11, 12) sont montés de manière pendulaire autour de la ligne d'axe.
EP90913063A 1989-09-15 1990-09-15 Procede d'extrusion a plat pour la fabrication de materiaux en bois lies par un produit inorganique ou organique, en particulier les panneaux stratifies Expired - Lifetime EP0448657B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90913063T ATE102538T1 (de) 1989-09-15 1990-09-15 Flach-strangpressverfahren zur herstellung von anorganisch oder organisch gebundenen holzwerkstoffen, insbesondere mehrschichtiger platten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3930840A DE3930840A1 (de) 1989-09-15 1989-09-15 Flach-strangpressverfahren zur herstellung von anorganisch oder organisch gebundenen holzwerkstoffen, insbes. mehrschichtiger platten
DE3930840 1989-09-15

Publications (2)

Publication Number Publication Date
EP0448657A1 EP0448657A1 (fr) 1991-10-02
EP0448657B1 true EP0448657B1 (fr) 1994-03-09

Family

ID=6389504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90913063A Expired - Lifetime EP0448657B1 (fr) 1989-09-15 1990-09-15 Procede d'extrusion a plat pour la fabrication de materiaux en bois lies par un produit inorganique ou organique, en particulier les panneaux stratifies

Country Status (5)

Country Link
US (1) US5185115A (fr)
EP (1) EP0448657B1 (fr)
CA (1) CA2042058A1 (fr)
DE (1) DE3930840A1 (fr)
WO (1) WO1991004142A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE468278B (sv) * 1989-11-21 1992-12-07 Curt Andersson Saett och anordning foer att av en komprimerbar materialblandning medelst ett munstycke och en formande roerlig matris framstaella en laangstraeckt balk
US5372493A (en) * 1993-05-13 1994-12-13 Rodgers; Gary C. Continuous casting apparatus using two moving belts
US5484641A (en) * 1993-11-01 1996-01-16 Rotter; Martin J. Process for fixing plastic reinforcing pins into non-woven filamentary material and product produced by the process
JPH0879626A (ja) * 1994-09-05 1996-03-22 Sony Corp ビデオ装置
DE4443763A1 (de) * 1994-12-08 1996-06-13 Hymmen Theodor Gmbh Kontinuierlich arbeitende Presse zum Herstellen von Holzwerkstoffplatten
FR2733932B1 (fr) * 1995-05-11 1999-01-22 Stihl Maschf Andreas Tronconneuse a chaine a moteur equipee d'un dispositif de freinage de la chaine
JP2968470B2 (ja) * 1996-02-15 1999-10-25 三木特種製紙株式会社 板状製品の連続製造装置及び方法
DE19622521C2 (de) * 1996-06-05 1998-09-17 Fraunhofer Ges Forschung Strangpreßverfahren zur kontinuierlichen Herstellung von organisch gebundenen Formteilen und Einrichtung zur Durchführung des Verfahrens
US5740898A (en) * 1996-10-24 1998-04-21 Macmillan Bloedel Limited Method and apparatus for laying up strands
DE19712440A1 (de) * 1997-03-25 1998-10-01 Hymmen Theodor Gmbh Vorrichtung zum Herstellen von Span- oder Faserplatten aus Zellulosewerkstoffen
DE10041838A1 (de) * 1999-08-25 2001-04-12 Ake Innotech Automatisierung K Verfahren und Vorrichtung zum Beeinflussen von Struktur und Lage der Fasern im Prozeß der aerodynamischen Vliesbildung
DE10224090A1 (de) 2002-05-31 2003-12-11 Metso Paper Inc Verfahren und Vorrichtung zur Benetzung faseriger Rohstoffe mit Bindemittel
EP2723546B1 (fr) * 2011-06-27 2018-08-22 Kingspan Holdings (IRL) Limited Procédé de fabrication de panneaux d' isolation

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD29187A (fr) *
DE350674C (de) * 1919-11-06 1922-03-24 Carl Lenkey Verfahren und Vorrichtung zur ununterbrochenen Herstellung mehrschichtiger Platten aus Faserstoff und einem hydraulischen Bindemittel
DE623315C (fr) * 1935-01-10
US2728939A (en) * 1951-01-03 1956-01-03 Allwood Inc Apparatus for producing composite wooden boards and the like
DE1172424B (de) * 1961-09-29 1964-06-18 Peter Voelskow Verfahren zur Herstellung gewellter Holzwerkstoffplatten
SU424733A1 (fr) * 1972-07-18 1974-04-25 вающей промышленности
DE2253648A1 (de) * 1972-11-02 1973-07-19 Knauf Westdeutsche Gips Vorrichtung zum herstellen von gipsplatten, insbesondere zwischenwandplatten
AT333642B (de) * 1975-01-24 1976-12-10 Oesterr Heraklith Ag Verfahren und vorrichtung zum automatischen dosieren unbemortelter oder bemortelter holzwolle fur die nachfolgende verformung zu leichtbauplatten
DE2722356C2 (de) * 1977-05-17 1982-07-29 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Verfahren und Vorrichtung zum kontinuierlichen Herstellen von Span-, Faser- o.dgl. Platten
CN1009443B (zh) * 1986-11-14 1990-09-05 库特·赫尔德·法布里肯特 制造复合木材制品板的方法和设备

Also Published As

Publication number Publication date
CA2042058A1 (fr) 1991-03-16
EP0448657A1 (fr) 1991-10-02
WO1991004142A1 (fr) 1991-04-04
US5185115A (en) 1993-02-09
DE3930840C2 (fr) 1993-09-23
DE3930840A1 (de) 1991-03-28

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