EP0162118B1 - Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une première couche de fibres - Google Patents

Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une première couche de fibres Download PDF

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Publication number
EP0162118B1
EP0162118B1 EP84104309A EP84104309A EP0162118B1 EP 0162118 B1 EP0162118 B1 EP 0162118B1 EP 84104309 A EP84104309 A EP 84104309A EP 84104309 A EP84104309 A EP 84104309A EP 0162118 B1 EP0162118 B1 EP 0162118B1
Authority
EP
European Patent Office
Prior art keywords
accordance
rake
metering
mat
weight per
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
Application number
EP84104309A
Other languages
German (de)
English (en)
Other versions
EP0162118A1 (fr
Inventor
Wolfgang Dipl.-Holzwirt Heller
Peter Rückert
Dieter Wiemann
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.)
Bison Werke Baehre and Greten GmbH and Co KG
Original Assignee
Bison Werke Baehre and Greten GmbH and Co KG
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 Bison Werke Baehre and Greten GmbH and Co KG filed Critical Bison Werke Baehre and Greten GmbH and Co KG
Priority to DE8484104309T priority Critical patent/DE3468365D1/de
Priority to AT84104309T priority patent/ATE31667T1/de
Priority to EP84104309A priority patent/EP0162118B1/fr
Priority to CA000478269A priority patent/CA1236813A/fr
Priority to US06/720,254 priority patent/US4636159A/en
Priority to JP60075480A priority patent/JPS60230803A/ja
Priority to NO851493A priority patent/NO851493L/no
Priority to FI851495A priority patent/FI76016C/fi
Publication of EP0162118A1 publication Critical patent/EP0162118A1/fr
Application granted granted Critical
Publication of EP0162118B1 publication Critical patent/EP0162118B1/fr
Expired 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
    • 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
    • B27N3/146—Controlling mat weight distribution

Definitions

  • the invention relates to a method for achieving a predeterminable basis weight distribution in the transverse direction of a nonwoven to be formed on a flat metering conveyor belt by means of wiping elements made of particles containing lignocellulose and cellulose, such as chips, fibers or the like, for the production of chip, fiber and the like, with at least one binder Plates. Furthermore, the invention is directed to an apparatus for performing such a method.
  • a control device for compensating for different basis weights in the transverse direction of chip or fiber nonwovens or the like for the production of chipboard, fiberboard and the like in which above a metering conveyor belt a stripping roller or the like for on the metering conveyor belt scattered chips, fibers and the like is provided.
  • the gap width between the metering conveyor belt and the stripping roller can be adjusted to compensate for different grammages in the cross direction of the fleece in that the metering conveyor belt below the stripping roller is infinitely variable and its height can be adjusted in the transverse direction.
  • the disadvantage of this known solution is that when the metering conveyor belt is lowered or raised section by section, the respectively adjacent segments are also always influenced and changed in an undesirable manner.
  • a further disadvantage is that the metering conveyor belt can be damaged due to different expansions across the width, there are looping effects on the metering conveyor belt in the area of the seals to the bunker side wall and, moreover, the metering conveyor belt, which in this case is difficult to guide, can never be sealed dust-tight with respect to the bunker side wall.
  • a device for metering wood shavings or other chip-like or fibrous substances and binders for the production of chipboard in which a scraping rake is provided in a bunker with a metering conveyor belt on the bottom, which is provided in its entirety is adjustable in height depending on signals obtained by means of a measuring device.
  • the object of the present invention is to design a method of the type defined at the outset in such a way that, while saving chip material, the scattering results are improved and that the density profile in the production direction during operation can be changed quickly and in a very differentiated manner in the transverse direction of the preliminary web in order to very specific areas, e.g. to specify specific density values at the edge zones or at already known longitudinal cut zones.
  • the structure of the device for carrying out the method according to the invention should be simple, easy to operate and reliable, and also suitable for retrofitting in existing systems.
  • the part of the task relating to the method is solved according to the invention in that representative measured values are formed for the grammages of strip-shaped areas adjoining one another in the transverse direction of the preliminary fleece, and in that the height of each of these strip-shaped fleece areas, based on the flat metering conveyor belt, is dependent on the respectively associated one Measured value is regulated by influencing a stripping element assigned to the relevant fleece area.
  • a very differentiated volume profile in the transverse direction of the metering conveyor belt can be achieved by creating a plurality of non-woven areas adjoining one another in the transverse direction, the respective basis weight of which can be specified very precisely owing to the influence of a wiping member assigned to the particular area, and the elimination of mutual influences of adjacent areas.
  • a preferred device for carrying out the method according to the invention which solves the device-related part of the task, consists of a flat metering conveyor belt, at least one stripping unit extending over the width of the metering conveyor belt and a device arranged in the running direction of the metering conveyor belt after the stripping unit for measuring the Basis weight of the preliminary web in its transverse direction.
  • This device is characterized according to the invention in that the stripping element is designed as a metering rake with several adjacent and independently adjustable segments, and in that the segments of this metering rake are adjusted as a function of the desired basis weight distribution while evaluating the measured values supplied by the measuring device is controlled.
  • a traversing measuring device is used as the measuring device, which works, for example, with gamma rays or on an optical basis with reflection light analysis.
  • This measuring device is either arranged behind the flexible rake in the area of the metering conveyor belt, as a result of which a particularly good regulation of the weight carried out can be achieved, or it is provided behind a scattering unit in the area of the forming belt, as a result of which the scattering can be improved, since influences of the scattering unit during Control process can be taken into account.
  • the individual side-by-side metering rake segments can consist, for example, of known, two-armed computing elements or of endless belts fitted with drivers, in the latter case all the adjacent endless belts being guided on the one hand by a common drive roller and on the other hand by a height-adjustable deflection roller.
  • metering rakes can also be used whose effective range can be adjusted by changing the length of the respective computing elements.
  • the rotating metering rake comprises a plurality of rake elements which are arranged next to one another and are adjustable in length, in particular telescopically extendable, wherein in each case a plurality of adjacent rake elements form a segment with elements which can be adjusted in length in each case.
  • the reference numeral 1 denotes a schematically indicated bunker into which, for example, glued wood chips are introduced in the direction of the arrow 2.
  • These shavings can be a mixture of shavings from different types of wood, for example shavings from hardwood and softwood, the density of which varies.
  • the density of beech is 0.68 g / cm 3
  • the density of spruce is about 0.43 g / cm 3 .
  • a pre-fleece 4 is formed from the supply of chips 3 with the aid of the metering conveyor belt 5 delimiting the bottom of the bunker 1 and a stripping element identified by the general reference number 10, which fleece leaves the metering conveyor belt 5 at a discharge point 8.
  • the stripping member 10 consists of a plurality of endless belts 12 which are directly adjacent in the transverse direction of the metering conveyor belt 5 and which are provided with drivers 13 on their outside.
  • strip-shaped endless belts 12 which together form the rear stripping member, are guided over a common drive roller 15 and each with its own deflection roller 16.
  • the deflection rollers 16 can be adjusted both jointly and individually in terms of their distance from the metering conveyor belt 5, as is indicated by the arrow 9.
  • the distance of the drive roller 15 with respect to the metering conveyor belt 5 is always significantly greater than the respective distance of the individual deflection rollers 16 from the metering conveyor belt 5, so that the desired back-stripping effect results with respect to the material supply 3 while simultaneously forming the pre-fleece 4.
  • Belt guide and tensioning rollers 14 are also arranged between the deflection rollers 16 and the drive roller 15.
  • a measuring device 6 for determining the basis weight is provided in the area between the deflection rollers 16 and the discharge point 8 and is arranged on a traverse so that it can be moved in the direction of arrow 7 transversely to the nonwoven fabric 4 and the basis weight values transverse to the direction of movement of the nonwoven fabric 4 determined.
  • FIG. 1 an adjustment in the sense of an enlargement of the gap between metering conveyor belt 5 and corresponding roller 16 is indicated for one of the adjacent sections of the stripping member 10.
  • the consequence of such an adjustment is that the pre-fleece 4 - as also indicated by dashed lines - has a greater height or thickness over the width of this section.
  • FIG. 2 shows, for example, four adjoining sections 11 of the stripping element 10, as shown in side view in FIG. 1.
  • Each section has, for example, a width of approximately 100 mm, which also corresponds to the width of the respective deflection roller 16 with the associated endless belt 12, which is occupied by drivers 13.
  • the deflection rollers 16 are preferably provided with a circumferential notch in which a corresponding attachment of the endless belt 12 engages and thus ensures that an absolute straight running of the respective belt is ensured.
  • the deflection rollers 16 can be adjusted in the direction of the arrows 9 relative to the metering conveyor belt 5, as a result of which the quantity discharged over the respective segment width is increased or decreased. This is indicated in FIG. 2 by the offset of the endless belts 12 which define the various segments 11.
  • the segments or deflection rollers 16 are preferably adjusted outside the bunker, either manually or by means of an electro-mechanical drive.
  • the manual adjustment is used when a simple embodiment is sufficient to solve the task and no direct regulation depending on actual values is required.
  • the discharge volume can also be changed over the entire effective width by simultaneously adjusting all deflection rollers 16, which corresponds to a kind of basic adjustment.
  • the rotary movement between the individual deflection rollers 16 is transmitted by special couplings that are installed between the rollers 16 and allow a large axis offset.
  • the profiling of the pre-fleece in the transverse direction shown in detail in FIG. 2 corresponds, for example, to a constant weight per unit area taking into account a different volume resulting from chip material of different densities.
  • the flexible metering rake 10 can also be used retrospectively in place of the last rake in front of the discharge point in a conventional system.
  • Fig. 3 shows an embodiment of a device according to the invention, in which the same parts are provided with the same reference numerals as in Figs. 1 and 2.
  • the stripping element 10 is designed in the manner of a conventional stripping rake with a plurality of two-armed computing elements 17 arranged next to one another. In each case several adjacent, two-armed computing elements 17 form a segment 11 in the sense of the illustration according to FIG. 2.
  • the embodiment according to FIGS. 1 and 2 in which the distance of the deflection rollers 16 from the metering conveyor belt 2 has been changed, the embodiment follows 3, with the axis of rotation of the metering rake 10 remaining fixed, a change in the effective circle 20 in the respective segment section by changing the radial length of the computing elements 17, which are telescopic and can be actuated via an adjusting device 18.
  • the computing elements 17 are held in two concentrically arranged hollow tubes 19, in which the adjusting devices 18 are mounted.
  • each segment can be set to a different gap width with respect to the metering conveyor belt 5, as a result of which the volume is different and can thus be selected that there is again a constant basis weight in the transverse direction of the preliminary web 5.
  • the flexible rake 10 can be driven, for example, by a chain drive from a three-phase geared motor, this geared motor then also driving the other rakes 21 located in the dosing hopper 1, the active circuits of which mesh in a conventional manner.

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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)
  • Preliminary Treatment Of Fibers (AREA)

Claims (16)

1. Procédé pour obtenir une répartition prédéterminée de poids par unité de surface dans le sens transversal d'une précouche (4) à former sur une bande plane de transporteur (5) de dosage au moyen d'organes de ratissage (10), précouche de particules (3) contenant de la lignocellulose et/ou de la cellulose additionnées d'au moins un liant, particules telles que copeaux, fibres ou analogues, pour la fabrication de panneaux d'agglomérés de copeaux, de fibres ou analogues, caractérisé en ce que des valeurs de mesure représentatives sont établies pour les poids par unité de surface de zones en forme de bande contiguës dans le sens transversal de la précouche (4) et en ce que la hauteur au-dessus de la bande de transporteur (5) de chacune de ces zones en forme de bande de la précouche est réglée en fonction de la valeur de mesure s'y rapportant respectivement par action d'un organe de ratissage (10) affecté à la zone de précouche concernée.
2. Procédé selon la revendication 1, caractérisé en ce que pour la mesure du poids par unité de surface de la précouche on élabore des mesures en continu en sens transversal et que, comme valeur de mesure représentative pour chaque zone en forme de bande, l'on utilise la valeur moyenne des mesures obtenues dans la zone concernée.
3. Procédé selon la revendication 1, caractérisé en ce que la commande des organes de ratissage affectés aux zones respectives de la précouche s'effectue aussi bien globalement qu'individuellement en fonction des écarts constatés par rapport aux valeurs de consigne du poids par unité de surface.
4. Dispositif pour la mise en oeuvre du procédé selon l'une ou plusieurs des revendications 1 à 3, constitué d'une bande transporteuse plane de dosage (5), d'au moins une unité de raclage (10) s'étendant sur la largeur de la dite bande de dosage et d'une installation placée dans le sens de marche de la bande transporteuse de dosage (4) après l'unité de raclage (10) pour la mesure du poids par unité de surface de la précouche (4) dans le sens transversal de celle-ci, caractérisé en ce que l'organe de raclage, est formé par un râteau de dosage (10) avec plusieurs segments (11) placés les uns à côté des autres et réglables indépendamment les uns des autres et en ce que le réglage des segments (11) de ce râteau de dosage (10) est commandé en fonction de la répartition prescrite du poids par unité de surface en exploitant les valeurs de mesure fournies par le système de mesure (6).
5. Dispositif selon la revendication 4, caractérisé en ce que le système de mesure (6), constitué en particulier comme un appareil de mesure mobile en sens transversal, est placé entre le râteau de dosage (10) présentant des segments réglables (11) et le poste de déchargement (8) de la précouche (4).
6. Dispositif selon la revendication 4, caractérisé en ce que le système de mesure (6), constitué en particulier comme un appareil de mesure mobile en sens transversal, est placé derrière une unité d'alimentation dans la zone de la bande de formage.
7. Dispositif selon la revendication 4, caractérisé en ce que le râteau de dosage (10) est partagé le long de sa largeur utile en segments individuels (11), dont les distances à la bande de transporteur de dosage (5) sont réglables indépendamment les unes des autres et à partir de l'extérieur de la trémie (1). ).
8. Dispositif selon la revendication 7, caractérisé en ce que l'on prévoit une commande électromécanique pour le réglage des segments.
9. Dispositif selon la revendication 7, caractérisé en ce que les segments élémentaires (11) sont reliés dans la zone de réglage les uns avec les autres au moyen d'accouplement permettant un décalage des axes.
10. Dispositif selon l'une des revendications 7 à 9, caractérisé en ce que chaque segment (11) du râteau de dosage comporte plusieurs éléments de ratissage (17) à deux bras.
11. Dispositif selon l'une des revendications 7 à 9, caractérisé en ce que chaque segment du râteau de dosage se compose d'une bande sans fin (12) garnie de tenons d'entraînement (13) et en ce que toutes les bandes sans fin placées les unes à côté des autres sont guidées d'une part autour d'un rouleau d'entraînement commun ( 15) et d'autre part respectivement autour d'un rouleau de renvoi (16) réglable en hauteur.
12. Dispositif selon la revendication 11, caractérisé en ce que les rouleaux de renvoi (16) sont réglables quant à leur distance à la bande du transporteur de dosage (5) et ensemble et individuellement.
13. Dispositif selon la revendication 4, caractérisé en ce que le râteau de dosage rotatif (10) se compose d'une pluralité d'éléments de râteau (17) placés côte à côte, réglables en longueur et en ce que respectivement plusieurs éléments de râteau (17) voisins forment un segment (11) comportant des éléments réglables ensemble en longueur.
14. Dispositif selon la revendication 13, caractérisé en ce que les éléments individuels de râteau (17) sont dépliables de manière télescopique.
15. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce qu'au moins un autre râteau (21) est disposé en amont du râteau de dosage (10).
16. Dispositif selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que l'organe de raclage est relié à un dispositif de réglage pour ajustage combiné de base et de précision, lequel est commandable en fonction de signaux de valeur de consigne et/ou de mesure séparément ou ensemble.
EP84104309A 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une première couche de fibres Expired EP0162118B1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DE8484104309T DE3468365D1 (en) 1984-04-16 1984-04-16 Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer
AT84104309T ATE31667T1 (de) 1984-04-16 1984-04-16 Verfahren und vorrichtung zur erzielung einer vorgebbaren flaechengewichtsverteilung in einem vorvlies.
EP84104309A EP0162118B1 (fr) 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une première couche de fibres
CA000478269A CA1236813A (fr) 1984-04-16 1985-04-03 Methode et dispositif pour en venir a l'uniformite predeterminable du volume massique en sens transverse d'une precouche ou d'une couche
US06/720,254 US4636159A (en) 1984-04-16 1985-04-05 Apparatus for obtaining a predeterminable distribution of weight in the transverse direction of a pre-mat and/or mat
JP60075480A JPS60230803A (ja) 1984-04-16 1985-04-11 チツプ等のマツトの均等な分布を得る方法とその装置
NO851493A NO851493L (no) 1984-04-16 1985-04-15 Fremgangsmaate og innretning for aa oppnaa en forutbestembar vektfordeling i tverretningen av en formatte og/eller matte
FI851495A FI76016C (fi) 1984-04-16 1985-04-15 Foerfarande och anordning foer aostadkommande av en pao foerhand bestaemd viktfoerdelning i tvaerriktningen av en foermatta och/eller matta.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84104309A EP0162118B1 (fr) 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une première couche de fibres

Publications (2)

Publication Number Publication Date
EP0162118A1 EP0162118A1 (fr) 1985-11-27
EP0162118B1 true EP0162118B1 (fr) 1988-01-07

Family

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Family Applications (1)

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EP84104309A Expired EP0162118B1 (fr) 1984-04-16 1984-04-16 Procédé et dispositif pour obtenir une répartition prédéterminée de poids par unité de surface dans une première couche de fibres

Country Status (4)

Country Link
EP (1) EP0162118B1 (fr)
JP (1) JPS60230803A (fr)
AT (1) ATE31667T1 (fr)
DE (1) DE3468365D1 (fr)

Families Citing this family (14)

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Publication number Priority date Publication date Assignee Title
FI75754C (fi) * 1986-10-13 1988-08-08 Rauma Repola Oy Anordning foer reglering av tvaerprofilen hos en pao ett transportband lagd spaonmatta.
CH683406A5 (de) * 1991-03-26 1994-03-15 Matec Holding Verfahren und Vorrichtung zum Herstellen eines fibrösen Formteils.
DE4434876B4 (de) * 1994-09-29 2004-09-16 Dieffenbacher Gmbh + Co. Kg Verfahren und Anlage zur kontinuierlichen Herstellung einer Mehrschichtplatte
SE526784C2 (sv) 2003-11-13 2005-11-01 Swedwood Internat Ab Spånskiva samt förfarande för tillverkning av spånskiva
DE102006012430B4 (de) * 2006-03-17 2016-03-24 Dieffenbacher GmbH Maschinen- und Anlagenbau Verfahren zur kontinuierlichen Herstellung von Mehrschichtplatten und eine Anlage zur Durchführung des Verfahrens
DE202010003791U1 (de) * 2010-03-18 2011-07-27 Binos Gmbh Scalperwalzen-Anordnung zum Nivellieren von auf einem Förderband aufliegenden Schüttgutmengen, insbesondere Holzschüttgutmengen
DE102011016343C5 (de) * 2010-06-02 2015-09-03 Fagus-Grecon Greten Gmbh Und Co Kg Verfahren zur Einstellung des Flächengewichts von auf ein Förderband aufgestreutem Schüttgut
DE202011102476U1 (de) * 2011-05-10 2011-09-07 Klaus Jurisch Vorrichtung zur Profilgebung der Oberseite einer Schüttgutbahn
DE202011102185U1 (de) * 2011-06-17 2011-12-01 Binos Gmbh Scalperwalzen-Anordnung zum Nivellieren von auf einem Förderband aufliegenden Schüttgutmengen, insbesondere Holzschüttgutmengen
EP2653279B1 (fr) 2012-04-18 2016-08-17 IKEA Supply AG Procédé et appareil de fabrication de panneaux de particules ayant une distribution de densité non uniforme
DE102013002259B4 (de) 2013-02-12 2016-11-03 Fagus-Grecon Greten Gmbh & Co. Kg Verfahren und Anlage zur Herstellung von Werkstoffpartikelplatten
ITUA20164307A1 (it) 2016-06-13 2017-12-13 Sacmi Macchina e metodo per la compattazione di polvere ceramica
EP3470192B1 (fr) * 2017-10-16 2020-06-24 SWISS KRONO Tec AG Procédé et dispositif destinés à la fabrication d'une plaque en matériau dérivé du bois
DE102019003796A1 (de) * 2019-05-29 2020-12-03 Bb Engineering Gmbh Vorrichtung und Verfahren zur Herstellung eines Vlieses

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Publication number Priority date Publication date Assignee Title
US2822024A (en) * 1956-01-16 1958-02-04 Allwood Inc Apparatus for manufacturing wood particle boards
DE1528236A1 (de) * 1966-03-09 1970-05-14 Baehre Metallwerk Kg Verfahren und Vorrichtung zur Dosierung der Gutaufgabe an Streumaschinen
DE7515958U (de) * 1975-05-20 1975-12-04 Baehre Und Greten Gmbh Vorrichtung zum dosieren von mit bindemitteln zu versehenden lignozellulosehaltigen teilchen wie holzspaenen o. dgl
DE2557352C3 (de) * 1975-12-19 1979-11-29 Carl Schenck Ag, 6100 Darmstadt Durchlaufverfahren zum kontinuierlichen Streuen eines gewichtskontrollierten Vlieses
DE3170270D1 (en) * 1981-07-04 1985-06-05 Schenck Ag Carl Method and apparatus for controlling the density distribution of a dispersed particle mat

Also Published As

Publication number Publication date
JPS60230803A (ja) 1985-11-16
DE3468365D1 (en) 1988-02-11
ATE31667T1 (de) 1988-01-15
EP0162118A1 (fr) 1985-11-27

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