EP0162118B1 - Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer - Google Patents

Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer 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
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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
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German (de)
French (fr)
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EP0162118A1 (en
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.)
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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/en
Priority to AT84104309T priority patent/ATE31667T1/en
Priority to EP84104309A priority patent/EP0162118B1/en
Priority to CA000478269A priority patent/CA1236813A/en
Priority to US06/720,254 priority patent/US4636159A/en
Priority to JP60075480A priority patent/JPS60230803A/en
Priority to NO851493A priority patent/NO851493L/en
Priority to FI851495A priority patent/FI76016C/en
Publication of EP0162118A1 publication Critical patent/EP0162118A1/en
Application granted granted Critical
Publication of EP0162118B1 publication Critical patent/EP0162118B1/en
Expired legal-status Critical Current

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    • 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)

Abstract

1. A method for obtaining a predetermined distribution of weight per unit area in the transverse direction of a pre-mat (4) to be formed on a flat metering conveyor band (5) by means of stripper devices (10), the pre-mat comprising particles (3) containing lignocellulose and/or cellulose, such as chips, fibers or the like, and at least one binding agent dispersed therein for the manufacture of chipboards, fibreboards and like boards, characterized in that measured values representative of the weight per unit area are formed from strip-like regions which adjoin one another in the transverse direction of the pre-mat (4) ; and in that the height of each of these strip-likek mat regions related to the flat metering conveyor band (5) is regulated in dependence on the representively associated measured value by influencing a stripper device (10) associated with the relevant mat region.

Description

Die Erfindung betrifft ein Verfahren zur Erzielung einer vorgebbaren Flächengewichtsverteilung in Querrichtung eines auf einem ebenen Dosierförderband mittels Rückstreiforganen zu formenden Vorvlieses aus mit mindestens einem Bindemittel versetzten lignozellulose- und zellulosehaltigen Teilchen wie Spänen, Fasern oder dergleichen für die Herstellung von Span-, Faser- und dergleichen Platten. Ferner ist die Erfindung auf eine Vorrichtung zur Durchführung eines solchen Verfahrens gerichtet.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.

Aus der DE-A-2 214 900 ist eine Steuervorrichtung zum Ausgleich unterschiedlicher Flächengewichte in der Querrichtung von Späne- oder Faservliesen oder dergleichen für die Herstellung von Spanplatten, Faserplatten und dergleichen bekannt, bei der oberhalb eines Dosierförderbandes eine Rückstreifwalze oder dergleichen für auf das Dosierförderband aufgestreute Späne, Fasern und dergleichen vorgesehen ist. Die Spaltbreite zwischen Dosierförderband und Rückstreifwalze kann zum Ausgleich unterschiedlicher Flächengewichte in der Querrichtung des Vlieses dadurch verstellt werden, dass das Dosierförderband unterhalb der Rückstreifwalze stufenlos und in Querrichtung in seiner Höhe unterschiedlich verstellbar ist.From DE-A-2 214 900 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 is known, 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.

Nachteilig ist bei dieser bekannten Lösung, dass bei einem sektionsweise erfolgenden Absenken oder Anheben des Dosierförderbandes stets auch die jeweils benachbarten Segmente beeinflusst und in unerwünschter Weise verändert werden. Ferner ist von Nachteil, dass das Dosierförderband aufgrund unterschiedlicher Dehnungen über die Breite beschädigt werden kann, sich im Bereich der Dichtungen zur Bunkerseitenwand Durchschleifeffekte am Dosierförderband ergeben und ausserdem das in diesem Falle schwer zu führende Dosierförderband niemals staubdicht bezüglich der Bunkerseitenwand abgedichtet werden kann.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.

Aus dem DE-U-7 515 958 ist eine Vorrichtung zum Dosieren von Holzspänen oder anderen span-oder faserartigen Stoffen und Bindemitteln für die Herstellung von Spanplatten bekannt, bei der in einem bodenseitig ein Dosierförderband aufweisenden Bunker ein Rückstreifrechen vorgesehen ist, der in seiner Gesamtheit in Abhängigkeit von mittels einer Messvorrichtung gewonnenen Signalen höhenverstellbar ausgebildet ist. Mittels dieser Anordnung kann erreicht werden, dass stets eine bestimmte Leimmenge mit einer bestimmten Spanmenge zusammengeführt wird und auf diese Weise eventuelle Überbeleimungen oder Unterbeleimungen des Spanmaterials vermieden werden können.From DE-U-7 515 958 a device for metering wood shavings or other chip-like or fibrous substances and binders for the production of chipboard is known, 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. By means of this arrangement it can be achieved that a certain amount of glue is always brought together with a certain amount of chip and in this way possible over-gluing or under-gluing of the chip material can be avoided.

Aus der EP-A 1-0 069 162 ist ein Verfahren zur Beeinflussung der Dichteverteilung eines zu streuenden Spänevlieses über seine Streubreite bekannt, bei dem aus einem aus mehreren Teilströmen bestehenden Spänestrom die Menge mindestens eines Teilstroms an mindestens einer Stelle seiner Breite reduziert wird, wozu zumindest ein höhen- und seitenverstellbarer Absaugrüssel vorgegebener Breite gegenüber Austragswalzen angeordnet ist und die abgesaugte Teilmenge wieder in den Bunker rücktransportiert wird. Diese Anordnung ist sehr aufwendig und hinsichtlich der Genauigkeit schlecht zu steuern.From EP-A 1-0 069 162 a method for influencing the density distribution of a chip fleece to be scattered over its scattering width is known, in which the quantity of at least one partial stream is reduced from at least one part of its width from a chip stream consisting of several partial streams, for which purpose at least one height and side-adjustable suction nozzle of a given width is arranged opposite discharge rollers and the extracted partial quantity is transported back into the bunker. This arrangement is very complex and difficult to control in terms of accuracy.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren der eingangs definierten Art in der Weise auszugestalten, dass unter Einsparung von Spanmaterial die Streuergebnisse verbessert werden und dass das Rohdichteprofil in Produktionsrichtung während des Betriebes schnell und in Querrichtung des Vorvlieses sehr differenziert verändert werden kann, um in ganz bestimmten Bereichen, z.B. den Randzonen oder an bereits bekannten Längsschnittzonen bestimmte Dichtewerte vorzugeben.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.

Die Vorrichtung zur Durchführung des Verfahrens nach der Erfindung soll im Aufbau einfach, leicht zu betätigen und betriebssicher sein sowie sich auch zum nachträglichen Einbau in bestehende Anlagen eignen.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.

Der das Verfahren betreffende Aufgabenteil wird nach der Erfindung dadurch gelöst, dass für die Flächengewichte von in Querrichtung des Vorvlieses aneinandergrenzende, streifenförmige Bereiche repräsentative Messwerte gebildet werden, und dass die auf das ebene Dosierförderband bezogene Höhe eines jeden dieser streifenförmigen Vliesbereiche in Abhängigkeit von dem jeweils zugehörigen Messwert durch Beeinflussung eines dem betreffenden Vliesbereich zugeordneten Rückstreiforgans geregelt wird.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.

Durch die Schaffung einer Mehrzahl von in Querrichtung aneinandergrenzender Vliesbereiche, deren jeweiliges Flächengewicht aufgrund der Beeinflussung eines jeweils dem speziellen Bereich zugeordneten Rückstreiforgans sehr genau vorgegeben werden kann, und die Ausschaltung von gegenseitigen Beeinflussungen nebeneinanderliegender Bereiche lässt sich ein sehr differenziertes Volumenprofil in Querrichtung des Dosierförderbandes erreichen.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.

Eine bevorzugte Vorrichtung zur Durchführung des Verfahrens nach der Erfindung, welche den vorrichtungsmässigen Teil der gestellten Aufgabe löst, besteht aus einem ebenen Dosierförderband, zumindest einer sich über die Breite des Dosierförderbandes erstreckenden Rückstreifeinheit und einer in Laufrichtung des Dosierförderbandes nach der Rückstreifeinheit angeordneten Einrichtung zur Messung des Flächengewichts des Vorvlieses in dessen Querrichtung. Diese Vorrichtung zeichnet sich nach der Erfindung dadurch aus, dass das Rückstreiforgan als Dosierrechen mit mehreren nebeneinander gelegenen und unabhängig voneinander verstellbaren Segmenten ausgebildet ist, und dass die Verstellung der Segmente dieses Dosierrechens in Abhängigkeit von der Soll-Flächengewichtsverteilung unter Auswertung der von der Messeinrichtung gelieferten Messwerte gesteuert ist.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.

Durch diese Massnahmen wird es möglich, eine exakte Auslasshöhe zwischen dem Dosierförderband und den einzelnen Rechensegmenten einzustellen, ohne dass dabei die jeweils voreingestellte Auslasshöhe benachbarter Segmente verändert wird. Die im Falle der Verstellung oder Verformung des Dosierförderbandes auftretenden Nachteile, wie insbesondere die Gefahr des Durchschleifens des Bandes und die staubdichte Abdichtung des Dosierförderbandes gegenüber den Bunkerseitenwänden, treten bei der Vorrichtungskonzeption nach der Erfindung nicht auf.These measures make it possible to set an exact outlet height between the metering conveyor belt and the individual rake segments without changing the respectively preset outlet height of adjacent segments. The disadvantages that arise in the event of adjustment or deformation of the metering conveyor belt, such as in particular the risk of the belt being dragged through and the dust-tight sealing of the metering conveyor belt from the bunker side walls, do not occur in the device design according to the invention.

Als Messeinrichtung wird insbesondere ein traversierendes Messgerät verwendet, das beispielsweise mit Gammastrahlen oder auf optischer Basis mit Rückstrahllichtauswertung arbeitet. Diese Messeinrichtung wird entweder hinter dem flexiblen Rechen im Bereich des Dosierförderbandes angeordnet, wodurch sich eine besonders gute Regelung des ausgetragenen Gewichts erzielen lässt, oder sie wird hinter einer Streueinheit im Bereich des Formbandes vorgesehen, wodurch sich die Streuung verbessern lässt, da Einflüsse der Streueinheit beim Regelvorgang berücksichtigt werden können.In particular, 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.

Die einzelnen nebeneinanderliegenden Dosierrechensegmente können beispielsweise aus für sich bekannten, zweiarmigen Rechenelementen oder aus mit Mitnehmern besetzten Endlosbändern bestehen, wobei im letzteren Falle alle nebeneinanderliegenden Endlosbänder einerseits um eine gemeinsame Antriebswalze und andererseits um jeweils eine höhenverstellbare Umlenkrolle geführt sind.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.

Beiden Ausführungsvarianten ist gemeinsam, dass jedes Segment für sich sehr exakt geregelt werden kann und störende Beeinflussungen benachbarter Segmente unterbleiben.Both versions have in common that each segment can be regulated very precisely and that there is no disruptive influence on neighboring segments.

Als Variante zu den in ihrem Abstand vom Dosierförderband einstellbaren Dosierrechensegmenten können auch solche Dosierrechen Verwendung finden, deren Wirkkreis durch Veränderung der Länge der jeweiligen Rechenelemente einstellbar ist. In diesem Falle umfasst der rotierende Dosierrechen eine Vielzahl nebeneinander angeordneter, in ihrer Länge verstellbarer, insbesondere teleskopartig ausfahrbarer Rechenelemente, wobei jeweils mehrere benachbarte Rechenelemente ein Segment mit gemeinsam in der Länge verstellbaren Elemeten bilden.As a variant of the metering rake segments that can be set at a distance from the metering conveyor belt, metering rakes can also be used whose effective range can be adjusted by changing the length of the respective computing elements. In this case, 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.

Weitere vorteilhafte Merkmale und Ausgestaltungen der Erfindung sind in Unteransprüchen angegeben.Further advantageous features and refinements of the invention are specified in the subclaims.

Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in der Zeichnung zeigt:

  • Fig. 1 eine schematische Darstellung einer nach dem erfindungsgemässen Verfahren arbeitenden Vorrichtung zum Ausgleich von Flächengewichtsschwankungen bei der Bildung von Vorvliesen,
  • Fig. 2 eine schematische Ansicht in Querrichtung des Vorvlieses zur Erläuterung der Arbeitsweise der Vorrichtung nach Fig. 1, und
  • Fig. 3 eine schematische Darstellung einer Variante der Vorrichtung nach Fig. 1.
The invention is explained in more detail below using exemplary embodiments with reference to the drawing; in the drawing shows:
  • 1 shows a schematic representation of a device according to the method of the invention for compensating for fluctuations in the basis weight when forming nonwovens,
  • Fig. 2 is a schematic view in the transverse direction of the pre-fleece to explain the operation of the device according to Fig. 1, and
  • 3 shows a schematic illustration of a variant of the device according to FIG. 1.

In Fig. 1 ist mit dem Bezugszeichen 1 ein schematisch angedeuteter Bunker gekennzeichnet, in den in Richtung des Pfeiles 2 beispielsweise beleimte Holzspäne eingebracht werden. Bei diesen Spänen kann es sich um ein Gemisch von Spänen aus unterschiedlichen Holzarten, z.B. um Späne aus Laubholz und Nadelholz handeln, deren Dichte unterschiedlich ist. Beispielsweise beträgt die Dichte von Buche 0,68 g/cm3, während die Dichte von Fichte etwa 0,43 g/cm3 beträgt.In Fig. 1, 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. For example, the density of beech is 0.68 g / cm 3 , while the density of spruce is about 0.43 g / cm 3 .

Aus dem Vorrat von Spänen 3 wird mit Hilfe des den Bunker 1 bodenseitig begrenzenden Dosierförderbandes 5 und eines mit dem allgemeinen Bezugszeichen 10 gekennzeichneten Rückstreiforgans ein Vorvlies 4 gebildet, das an einer Abwurfstelle 8 das Dosierförderband 5 verlässt.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.

Das Rückstreiforgan 10 besteht aus mehreren in Querrichtung des Dosierförderbandes 5 unmittelbar aneinandergrenzenden Endlosbändern 12, die an ihrer Aussenseite mit Mitnehmern 13 versehen sind.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.

Diese streifenförmigen und in ihrer Gesamtheit das Rückstreiforgan bildenden Endlosbänder 12 sind über eine gemeinsame Antriebswalze 15 und jeweils eine eigene Umlenkrolle 16 geführt. Die Umlenkrollen 16 sind sowohl gemeinsam als auch jeweils für sich in ihrem Abstand zum Dosierförderband 5 verstellbar, wie dies durch den Pfeil 9 angedeutet ist.These 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.

Der Abstand der Antriebswalze 15 bezüglich des Dosierförderbandes 5 ist stets deutlich grösser als der jeweilige Abstand der einzelnen Umlenkrollen 16 vom Dosierförderband 5, so dass sich bezüglich des Materialvorrats 3 der gewünschte Rückstreifeffekt unter gleichzeitiger Bildung des Vorvlieses 4 ergibt.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.

Zwischen den Umlenkrollen 16 und der Antriebswalze 15 sind noch Bandführungs- und Spannwalzen 14 angeordnet.Belt guide and tensioning rollers 14 are also arranged between the deflection rollers 16 and the drive roller 15.

Ein Messgerät 6 zur Bestimmung des Flächengewichts ist im Bereich zwischen den Umlenkrollen 16 und der Abwurfstelle 8 vorgesehen und auf einer Traverse angeordnet, so dass es in Richtung des Pfeiles 7 quer zum Vorvlies 4 bewegt werden kann und dabei die Flächengewichtswerte quer zur Bewegungsrichtung des Vlieses 4 ermittelt.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.

In Fig. 1 ist strichliert für eine dernebeneinanderlie- genden Sektionen des Rückstreiforgans 10 eine Verstellung im Sinne einer Vergrösserung des Spaltes zwischen Dosierförderband 5 und entsprechender Rolle 16 angedeutet. Die Folge einer derartigen Einstellung ist, dass auch das Vorvlies 4 - wie ebenfalls strichliert angedeutet - auf der Breite dieser Sektion eine grössere Höhe bzw. Dicke besitzt.In 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 zeigt beispielsweise vier aneinandergrenzende Sektionen 11 des Rückstreiforgans 10, wie es in Fig. 1 in Seitenansicht dargestellt ist.FIG. 2 shows, for example, four adjoining sections 11 of the stripping element 10, as shown in side view in FIG. 1.

Jede Sektion hat beispielsweise eine Breite von etwa 100 mm, was auch der Breite der jeweiligen Umlenkrolle 16 mit zugehörigem, mit Mitnehmern 13 besetztem Endlosband 12 entspricht. Die Umlenkrollen 16 sind vorzugsweise mit einer umlaufenden Kerbe versehen, in die ein entsprechender Ansatz des Endlosbandes 12 eingreift und damit sicherstellt, dass ein absoluter Geradelauf des jeweiligen Bandes gewährleistet ist.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.

Die Umlenkrollen 16 können in Richtung der Pfeile 9 relativ zum Dosierförderband 5 verstellt werden, wodurch die über die jeweilige Segmentbreite ausgetragene Menge vergrössert bzw. verringert wird. Dies ist in Fig. 2 durch die Versetzung der die verschiedenen Segmente 11 festlegenden Endlosbänder 12 angedeutet.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.

Die Verstellung der Segmente bzw. Umlenkrollen 16 erfolgt vorzugsweise ausserhalb des Bunkers, und zwar wahlweise manuell oder durch einen elektro-mechanischen Antrieb. Die manuelle Verstellung wird dann verwendet, wenn eine einfache Ausführungsform zur Lösung der gestellten Aufgabe ausreicht und keine unmittelbare Regelung in Abhängigkeit von Ist-Werten erforderlich ist.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.

Das Austragsvolumen kann aber auch über die gesamte Wirkbreite durch gleichzeitiges Verstellen aller Umlenkrollen 16 verändert werden, was einer Art Grundjustierung entspricht.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.

Die Drehbewegung zwischen den einzelnen Umlenkrollen 16 wird durch Spezialkupplungen übertragen, die zwischen den Rollen 16 eingebaut sind und einen grossen Achsversatz ermöglichen.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.

Die in Fig. 2 im einzelnen dargestellte Profilierung des Vorvlieses in Querrichtung entspricht beispielsweise einem konstanten Flächengewicht unter Berücksichtigung eines unterschiedlichen Volumens herrührend von Spanmaterial unterschiedlicher Dichte.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.

Dem Rückstreiforgan 10 nach Fig. 1 kann in üblicher Weise ein weiterer Rechen oder mehrere derartige Rechen vorgeschaltet sein, wobei in einer herkömmlichen Anlage der flexible Dosierrechen 10 auch nachträglich anstelle des bisher letzten Rechens vor der Abwurfstelle eingesetzt werden kann.1 can be preceded by a further rake or several rakes of this type in a conventional manner, in which case 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 zeigt eine Ausführungsvariante einer Vorrichtung nach der Erfindung, bei der gleiche Teile mit den gleichen Bezugszeichen wie in den Fig. 1 und 2 versehen sind.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.

Das Rückstreiforgan 10 ist bei dieser Ausführungsform nach Art eines herkömmlichen Rückstreifrechens mit einer Vielzahl nebeneinander angeordneter, jeweils zweiarmiger Rechenelemente 17 ausgebildet. Jeweils mehrere nebeneinanderliegende, zweiarmige Rechenelemente 17 bilden ein Segment 11 in Sinne der Darstellung nach Fig. 2. Im Gegensatz zur Ausführungsform nach den Fig. 1 und 2, bei denen der Abstand der Umlenkrollen 16 zum Dosierförderband 2 verändert wurde, erfolgt bei der Ausführungsform nach Fg. 3 bei festbleibender Drehachse des Dosierrechens 10 eine Änderung des Wirkkreises 20 im jeweiligen Segmentabschnitt durch Veränderung der radialen Länge der Rechenelemente 17, die teleskopartig ausgebildet und über eine Verstelleinrichtung 18 betätigbar sind. Beispielsweise sind die Rechenelemente 17 in zwei konzentrisch angeordneten Hohlrohren 19 gehaltert, in denen die Verstelleinrichtungen 18 montiert sind. Durch Steuerung dieser Verstelleinrichtungen 18 insbesondere in Abhängigkeit von den mittels der Messeinrichtung 6 gewonnenen Messwerten des Flächengewichts lässt sich analog zu der Anordnung nach Fig. 2 jedes Segment auf eine unterschiedliche Spaltbreite bezüglich des Dosierförderbandes 5 einstellen, wodurch das Volumen unterschiedlich wird und so gewählt werden kann, dass sich in Querrichtung des Vorvlieses 5 wiederum ein konstantes Flächengewicht ergibt.In this embodiment, 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. In contrast to 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. For example, the computing elements 17 are held in two concentrically arranged hollow tubes 19, in which the adjusting devices 18 are mounted. By controlling these adjusting devices 18, in particular depending on the measured values of the basis weight obtained by means of the measuring device 6, analogously to the arrangement according to FIG. 2, 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.

Der Antrieb des flexiblen Rechens 10 kann beispielsweise über einen Kettenantrieb von einem Drehstrom-Getriebemotor aus erfolgen, wobei dieser Getriebemotor dann auch die übrigen im Dosierbunker 1 befindlichen Rechen 21 antreibt, deren Wirkkreise in üblicher Weise ineinandergreifen.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.

Allen beschriebenen Ausführungsformen ist gemeinsam,

  • dass die Verstellung der Segmente während des Betriebes ausserhalb des Bunkers 1 erfolgen kann,
  • dass insbesondere in Verbindung mit der zugeordneten Messeinrichtung 6 die Streuergebnisse unter gleichzeitiger Einsparung von Spanmaterial verbessert werden,
  • dass das Rohdichteprofil in Produktionsrichtung während des Betriebs veränderbar ist und beispielsweise höhere Dichten in den Randzonen und in den vorbekannten Längsschnittzonen gewählt werden können,
  • dass die bewährte Funktion der zweiarmigen Rückstreifrechen entsprechend der Ausführungsform nach Fig. 3 unverändert beibehalten werden kann,
  • dass jederzeit ein nachträglicher Einbau in bestehende Anlagen möglich ist, und
  • dass eine exakte Auslasshöhe zwischen Dosierförderband 5 und den einzelnen Segmenten 11 einstellbar ist, ohne dass dabei die voreingestellte Auslasshöhe der benachbarten Segmente verändert wird.
All described embodiments have in common
  • that the segments can be adjusted outside the bunker 1 during operation,
  • that in particular in connection with the associated measuring device 6 the scattering results are improved while at the same time saving chip material,
  • that the bulk density profile in the production direction can be changed during operation and, for example, higher densities can be selected in the peripheral zones and in the known longitudinal cutting zones,
  • that the proven function of the two-armed rake rake according to the embodiment according to FIG. 3 can be retained unchanged,
  • that subsequent installation in existing systems is possible at any time, and
  • that an exact outlet height between the metering conveyor belt 5 and the individual segments 11 can be set without changing the preset outlet height of the adjacent segments.

BezugszeichenlisteReference symbol list

  • 1 Bunker1 bunker
  • 2 Spaneinfall2 chip incidence
  • 3 Materialvorrat3 stock of materials
  • 4 Vorvlies4 fleece
  • 5 Dosierförderband5 dosing conveyor
  • 6 Messgerät6 measuring device
  • 7 Bewegungsrichtung Messgerät7 Direction of movement measuring device
  • 8 Abwurfstelle8 discharge point
  • 9 Richtung Umlenkrollenverstellung9 Direction of pulley adjustment
  • 10 Dosierrechen10 dosing rakes
  • 11 Segment11 segment
  • 12 Endlosband12 endless belt
  • 13 Mitnehmer13 carriers
  • 14 Führungswalzen14 guide rollers
  • 15 Antriebswalze15 drive roller
  • 16 Umlenkrolle16 deflection roller
  • 17 Rechenelement17 computing element
  • 18 Verstelleinrichtung18 adjustment device
  • 19 Hohlrohre19 hollow tubes
  • 20 Wirkkreis20 active circle
  • 21 Festrechen21 Fixed rake

Claims (16)

1. A method for obtaining a predetermined distribution of weight per unit area in the transverse direction of a pre-mat (4) to be formed on a flat metering conveyor band (5) by means of stripper devices (10), the pre-mat comprising particles (3) containing lignocellulose and/or cellulose, such as chips, fibers orthe like, and at least one binding agent dispersed therein for the manufacture of chipboards, fibreboards and like boards, characterized in that measured values representative of the weight per unit area are formed from strip-like regions which adjoin one another in the transverse direction of the pre-mat (4); and in that the height of each of these strip-likek mat regions related to the flat metering conveyor band (5) is regulated in dependence on the representively associated measured value by influencing a stripper device (10) associated with the relevant mat region.
2. A method in accordance with claim 1, characterized in that measured values are continually formed during the measurement of the weight per unit area in the transverse direction of the mat and the mean value of the measured values obtained in the relevant region is used as the measured value representative for each strip-like region.
3. A method in accordance with claim 1, characterized in that the influencing of the stripper device associated with the individual mat regions is carried out both collectively and also individually in dependence on the deviations from the desired value of the weight per unit area.
4. Apparatus for carrying out the method of one or more of claims 1 to 3, comprising a flat metering conveyor band (5), at least one stripper unit (10) extending over the width of the conveyor band and a device arranged after the stripper unit (10) in the direction of movement of the metering conveyor band (5) for measuring the weight per unit area of the pre-mat (4) in the transverse direction thereof, characterized in that the stripper device is formed as a metering rake (10) with several segments (11) disposed side by side and adjustable independently from one another; and in that the adjustment of the segments (11) of this metering rake (10) is controlled in dependence on the desired distribution of the weight per unit area by evaluation of the measured values delivered from the measuring device (6).
5. Apparatus in accordance with claim 4, characterized in that the measuring device (6) which is in particular formed as a traversing measuring device, is arranged between the metering rake (10), which has adjustable segments (11), and the discharge position (8) of the pre-mat (4).
6. Apparatus in accordance with claim 4, characterized in that the measuring device (6), which is in particular formed as a traversing measuring device is arranged behind a scattering unit in the region of the forming band.
7. Apparatus in accordance with claim 4, characterized in that the metering rake (10) is divided over its wirking width into individual segments (11) the spacing of which from the metering conveyor band (5) can be adjusted independently of each other and from outside the bunker (1).
8. Apparatus in accordance with claim 7, characterized in that an eletromechanical drive is provided for adjusting the segments.
9. Apparatus in accordance with claim 7, characterized in that the individual segments (11) are connected together in the adjustment range via couplings which make a displacement of the axes possible.
10. Apparatus in accordance with one of the claims 7 to 9, characterized in that each metering rake segment (11) includes a plurality of two-armed rake elements (17).
11. Apparatus in accordance with one of the claims 7 to 9, characterized in that each metering rake segment comprises an endless band (12) equiped with entrainment devices (13); and in that all adjacent endless bands are guided on the one hand around a common drive roller (15) and on the other hand about a respective vertically adjustable deflection roller (16).
12. Apparatus in accordance with claim 11, characterized in that the deflecting rollers (16) are adjustable with respect to their distance from the metering conveyor band (5) both jointly and also individually.
13. Apparatus in accordance with claim 4, characterized in that the rotating metering rake (10) comprises a plurality of rake elements (17) arranged alongside one another and of adjustable length; and in that in each case several adjacent rake elements (17) form a segment (11) with elements which are jointly adjustable in length.
14. Apparatus in accordance with claim 13, characterized in that the individual rake elements (17) are made telescopically extensible.
15. Apparatus in accordance with one or more of the preceding claims, characterized in that at least one further rake (21) is inserted before the metering rake (10).
16. Apparatus in accordance with one or more of the preceding claims, characterized in that the stripping device is connected with a positioning means for combined basic and fine adjustment which is controllable in dependence on the desired value signals and/or measured value signals both separately and also simultaneously.
EP84104309A 1984-04-16 1984-04-16 Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer Expired EP0162118B1 (en)

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 (en) 1984-04-16 1984-04-16 METHOD AND DEVICE FOR ACHIEVEMENT OF A PRESCRIBABLE WEIGHT DISTRIBUTION IN A PRE-FLEECE.
EP84104309A EP0162118B1 (en) 1984-04-16 1984-04-16 Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer
CA000478269A CA1236813A (en) 1984-04-16 1985-04-03 Method of and apparatus for obtaining a predeterminable distribution of weight in the transverse direction of a pre-mat and/or mat
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 (en) 1984-04-16 1985-04-11 Method and device for obtaining uniform distribution of mat of chip, etc.
NO851493A NO851493L (en) 1984-04-16 1985-04-15 PROCEDURE AND DEVICE FOR AA GET A PRESCRIBED WEIGHT DISTRIBUTION IN THE DIRECTION OF A SIZE AND / OR MATT
FI851495A FI76016C (en) 1984-04-16 1985-04-15 Method and apparatus for providing a predetermined weight distribution in the transverse direction of a preform and / or mat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84104309A EP0162118B1 (en) 1984-04-16 1984-04-16 Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer

Publications (2)

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

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EP84104309A Expired EP0162118B1 (en) 1984-04-16 1984-04-16 Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer

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EP (1) EP0162118B1 (en)
JP (1) JPS60230803A (en)
AT (1) ATE31667T1 (en)
DE (1) DE3468365D1 (en)

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FI75754C (en) * 1986-10-13 1988-08-08 Rauma Repola Oy Device for controlling the cross profile of a chip mat laid on a conveyor belt.
CH683406A5 (en) * 1991-03-26 1994-03-15 Matec Holding Method and apparatus for producing a fibrous molding.
DE4434876B4 (en) * 1994-09-29 2004-09-16 Dieffenbacher Gmbh + Co. Kg Process and plant for the continuous production of a multilayer board
SE526784C2 (en) 2003-11-13 2005-11-01 Swedwood Internat Ab Particleboard and process for the manufacture of particleboard
DE102006012430B4 (en) * 2006-03-17 2016-03-24 Dieffenbacher GmbH Maschinen- und Anlagenbau Process for the continuous production of multilayer boards and a plant for carrying out the process
DE202010003791U1 (en) * 2010-03-18 2011-07-27 Binos Gmbh Scalper roller arrangement for leveling bulk quantities of bulk material resting on a conveyor belt, in particular quantities of wood chips
DE102011016343C5 (en) * 2010-06-02 2015-09-03 Fagus-Grecon Greten Gmbh Und Co Kg Method for adjusting the basis weight of bulk material scattered on a conveyor belt
DE202011102476U1 (en) * 2011-05-10 2011-09-07 Klaus Jurisch Device for profiling the top of a bulk material web
DE202011102185U1 (en) * 2011-06-17 2011-12-01 Binos Gmbh Scalper roller arrangement for leveling bulk quantities of bulk material resting on a conveyor belt, in particular quantities of wood chips
PL2653279T3 (en) 2012-04-18 2017-02-28 Ikea Supply Ag Method and apparatus for making particle boards having a non-uniform density distribution
DE102013002259B4 (en) 2013-02-12 2016-11-03 Fagus-Grecon Greten Gmbh & Co. Kg Process and plant for the production of material particle plates
ITUA20164307A1 (en) 2016-06-13 2017-12-13 Sacmi MACHINE AND METHOD FOR THE COMPACTION OF CERAMIC POWDER
ES2807541T3 (en) * 2017-10-16 2021-02-23 SWISS KRONO Tec AG Procedure and device for the manufacture of a wood composite plate
DE102019003796A1 (en) * 2019-05-29 2020-12-03 Bb Engineering Gmbh Device and method for producing a fleece

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US2822024A (en) * 1956-01-16 1958-02-04 Allwood Inc Apparatus for manufacturing wood particle boards
DE1528236A1 (en) * 1966-03-09 1970-05-14 Baehre Metallwerk Kg Method and device for dosing the material feed to spreading machines
DE7515958U (en) * 1975-05-20 1975-12-04 Baehre Und Greten Gmbh DEVICE FOR DOSING LIGNOCELLULOSE-CONTAINING PARTICLES TO BE PROVIDED WITH BINDING AGENTS, SUCH AS WOOD CHIPS OR THE LIKE
DE2557352C3 (en) * 1975-12-19 1979-11-29 Carl Schenck Ag, 6100 Darmstadt Continuous process for the continuous spreading of a weight-controlled fleece
DE3170270D1 (en) * 1981-07-04 1985-06-05 Schenck Ag Carl Method and apparatus for controlling the density distribution of a dispersed particle mat

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ATE31667T1 (en) 1988-01-15
JPS60230803A (en) 1985-11-16
EP0162118A1 (en) 1985-11-27
DE3468365D1 (en) 1988-02-11

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