EP0292581B1 - Fibre felt strewing method - Google Patents

Fibre felt strewing method Download PDF

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Publication number
EP0292581B1
EP0292581B1 EP87107526A EP87107526A EP0292581B1 EP 0292581 B1 EP0292581 B1 EP 0292581B1 EP 87107526 A EP87107526 A EP 87107526A EP 87107526 A EP87107526 A EP 87107526A EP 0292581 B1 EP0292581 B1 EP 0292581B1
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EP
European Patent Office
Prior art keywords
mat
width
supply
felt
rakes
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
EP87107526A
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German (de)
French (fr)
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EP0292581A1 (en
Inventor
Walter Henschel
Manfred Riesner
Uwe Dr. Kunstmann
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.)
Carl Schenck AG
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Carl Schenck AG
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Filing date
Publication date
Application filed by Carl Schenck AG filed Critical Carl Schenck AG
Priority to DE8787107526T priority Critical patent/DE3766247D1/en
Priority to AT87107526T priority patent/ATE58325T1/en
Priority to EP87107526A priority patent/EP0292581B1/en
Priority to US07/191,041 priority patent/US4931243A/en
Priority to FI882166A priority patent/FI85959C/en
Priority to CA000566410A priority patent/CA1300552C/en
Publication of EP0292581A1 publication Critical patent/EP0292581A1/en
Application granted granted Critical
Publication of EP0292581B1 publication Critical patent/EP0292581B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • 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 content of the invention is a method for controlling a transverse distribution for a chip fleece in which, based on a chip supply, a chip-air mixture is formed as a stream of chips, which is deposited in the width of the fleece on a base which is moved past under the chip supply.
  • the European patent application EP-A 69 162 has disclosed a method for influencing the density distribution of a chip fleece to be scattered and a device for this purpose, which is characterized in that at least one partial stream over a part of its width corresponds to a predetermined density distribution Partial quantity is removed.
  • Partial quantity is removed.
  • European patent 0 109 456 has disclosed a method and a device for equalizing the density distribution in a synthetic wood panel, in which, depending on the weight distribution of the bulk material discharged from a supply measured over a discharge cross-section, a separation command for those present in the corresponding partial cross-sections is issued by one predetermined target density distribution deviating weight quantity of the bulk material is formed for their separation.
  • a separation command for those present in the corresponding partial cross-sections is issued by one predetermined target density distribution deviating weight quantity of the bulk material is formed for their separation.
  • EP-A 230 483 discloses a method for controlling a transverse distribution for a chip fleece, which is based on a chip flow which is formed in Fleece width is deposited on a mat that is moved past under the chip supply, in which the chip flow is divided into two partial streams, the direction of flow of the other partial stream runs in the opposite direction, and in which the K partial stream is located at a plurality of removal points distributed over the fleece width, which are in one area are arranged laterally and at the lower end of a strand of transfer rollers, partial quantities can be removed in accordance with a uniform or predetermined fleece height distribution over the fleece width.
  • the present invention is also based on the object of eliminating errors which are caused by discharge elements in the transverse distribution of the chip fleece and of carrying out a control and control of the transverse distribution.
  • the solution to the object according to the present application differs by the following procedural features: the chip flow is initially divided into two partial flows, in which each partial flow is subsequently made up of bars arranged in a cascade-shaped manner and obliquely to the vertical plane running transversely to the fleece direction existing rakes are divided into further partial streams that mix again, and partial quantities are taken from a further partial stream at the lower end of a cascade.
  • the errors caused by the removal devices are eliminated by dividing the spreading material removed from the supply over the entire spreading width and by changing the direction of the individual particles. There is a quasi-uniform alignment of chip particles that fall unevenly into a cascade. This allows correct removal from the uniform chip veil to be carried out via the predetermined fleece distribution curve when the fleece is deposited.
  • German published patent application 2 942 163 discloses a method and a device for dividing a conveying flow, which is characterized in that the conveying flow is continuously fed to a flow divider and the continuous partial flows along the flow divider and several are continuously conveyed through the flow divider.
  • chip quantities supplied to this current divider are exactly divided, but this also means that the distribution errors present in the spreading material are passed on via a distribution chute.
  • the object on which the invention is based is achieved on the basis of the state of the art which has become so well known by the characterizing features of claim 2.
  • a receiving device provided with closable openings is provided in the area of the last cascade; a beam of light emitted by a light source strikes the chip fleece across its width across the direction of progress; a video camera records this light beam and passes this information on to a computer in which control information for the recording device is provided be tested.
  • Such a device produces a chip fleece that is completely uniform across the width on a base. It is assumed here that the bulk density is constant when using uniform material with the same bed height. If a predetermined bulk height, which is comparable to a predetermined bulk density, is to be generated and controlled, this is also achieved by the characterizing features of claim 2.
  • a conveyor device is provided in the receiving device. This makes it possible, according to the invention, on the one hand, to transport back the partial quantity present in the receiving device or, according to the invention, to distribute it evenly over the spreading width and by arranging a weir which extends over the entire width of the fleece, a uniform application of a fleece layer either below the fleece to be built up or onto it put on the fleece.
  • At least one spreader roller is additionally provided under the last cascade. This ensures that the chips are easily separated in the transition area to the cover layers. In addition, braking and flattening of the chips is supported at the same time.
  • the receiving device has closable openings separated by webs, which can be displaced with respect to one another transversely to the nonwoven direction with the rake interacting with them.
  • the webs of the receiving device are designed as rakes.
  • a particularly advantageous embodiment consists in that two rakes provided one above the other and above the receiving device can be displaced relative to one another transversely to the fleece direction. This arrangement allows the opening width into the receiving device to be regulated in the simplest form, which inevitably leads to a regulation of the receiving amount.
  • a device is proposed according to the invention in which the light lines recorded over a length of the fleece are stored in the computer over the width of the fleece and then the surface of the plate is displayed in a color grid assigned to the height layers on a monitor.
  • the nonwoven surface changes, it is proposed that not one but several light lines are emitted over the entire width of the nonwoven. This ensures that changes in fleece height can also be recorded by the same camera when the video camera is stationary.
  • FIG. 1 bulk material 2 to be scattered from a chip supply (not shown) via a rake-like dividing device I for the production of chipboard, waverboard and OSB boards is fed via a distribution chute 3 to the rake pairs 5, 6, 7 located in a housing 4.
  • the rake pairs each consist of rods of the same length that extend over the width of the fleece and are spaced from one another and are preferably attached to cross rods 8 with one end each.
  • the cross bars 8 also extend over the entire width of the housing 4, which is adapted to the fleece width.
  • the number shown in FIG. 1 and the inclination of the rakes represent only one exemplary embodiment.
  • the computing pair 5 forms the first cascade
  • the computing pairs 6 and 7 form the second cascade.
  • the inclination of the pairs of rakes to one another is initiated via the cross bars 8 from outside the housing 4.
  • two spreader rollers 9 are arranged below the last cascade. These are used to change and brake the evenly distributed material in its direction of fall and / or to achieve a simple separation of the chip material if a chipboard or an OSB board is produced from several chip layers and the present device, for example for the production of the Middle class is used.
  • such dissolving devices as described in FIG. I can be arranged one behind the other, the first and third housings, for example in the production of three-layer boards, having no spreader rollers 9, while the second housing is on its outlet has 10 spreader rollers 9.
  • a pick-up device 11 is also provided on a rake of the pair of rakes 7, by means of which too much scattered material is picked up.
  • the function of this receiving device is explained in more detail in connection with FIG. 2.
  • the arrangement of the receiving device according to FIG. I in front of the rake which is the most downstream in the direction of the fleece which is built up on a base only sets
  • the receiving device II can also be located behind the rake which is the most upstream in the direction of the fleece which is built up on a base (fleece direction), in this case the left rake of the pair of rakes 8.
  • a fleece holding device 12 is shown below the housing 4, which extends over the entire spreading width.
  • the fleece receiving device 12 can be a conveyor belt that extends over the width of the chip fleece or overlapping flexible or rigid underlays or a combination of such fleece carriers.
  • the fleece receiving device 12 moves in the direction of an arrow 13, so that the final fleece height 14 for the fleece formed under this housing is reached at the left end of the housing 4.
  • the course of the fleece height over the width of a scattered fleece is represented by a first monitor 21 connected to the computer 18, and the height layers are shown on a second monitor 22 in a grid over the length of a finished chipboard.
  • nonwoven surfaces can be recorded with a fixed video camera which differ significantly in height without the scattering accuracy being reduced thereby .
  • the bulk material 2 falling into the housing 4 according to FIG. 2 via a rake-like dividing device I is divided up via the distribution chute 3.
  • the errors of the part of the non-redirected bulk material 2 will remain until the end of the distribution chute. If a partial stream 25 thus provided with errors strikes the computing pair 5, this is resolved into a further partial stream 26 and the previous partial stream 25 by the right computing unit of the computing pair 5.
  • the further partial stream 26 divides again on the left rake of the computing pair 7, so that any irregularities present on the distribution chute 3 are thereby compensated.
  • the partial flow 25, which could still have distribution errors from the distribution chute 3, will come into the area of the receiving device II, which also extends over the entire later fleece width.
  • the partial stream 25 is also divided here.
  • the distribution error arriving via the distribution chute 3 has already become so small that this error can be regarded as practically balanced .
  • higher accuracy it is possible at any time to add further cascade levels depending on the required accuracy.
  • openings 27 of the receiving device are opened more or less according to a double arrow 28, so that the excess quantity of bulk material discharged from the supply (not shown) can flow into the receiving device II.
  • a distribution screw 29 is provided in the receiving device II, through which the incoming material can be transported away. Instead of returning the excess bulk material to the supply, a conveyor device (99), which is moved back and forth perpendicularly to the image plane, can serve, as shown in more detail in FIG. 3, to even out excess bulk material 30 within the receiving device. If the receiving device II has an overflow edge 31 in its lower part, the overpoured material 30 will thereby emerge and, depending on the arrangement of the receiving device, be placed downstream or upstream in the area of the last cascade as a nonwoven underlay or as a nonwoven underlay.

Abstract

In a method for strewing a fibre felt (16) from a supply in a width corresponding to the felt width on a base (12) moved through underneath the supply in accordance with a felt-height distribution, predetermined in the felt, transversely to the felt direction, and an apparatus for strewing a fibre felt from a supply in a width corresponding to the felt width onto a base moving through underneath the supply in accordance with a felt-height distribution, predetermined in the felt, transversely to the felt direction using a rake-like proportioning apparatus, arranged between supply and felt deposit, and a distributing chute (3), there is proposed, in order to eliminate errors caused by delivery members in the transverse distribution of the fibre felt, and to monitor and control the transverse distribution, a cascade arrangement of a plurality of mutually inclined rakes (5, 6, 7). <IMAGE>

Description

Die Erfindung hat zum Inhalt ein Verfahren zum Steuern einer Querverteilung für ein Spänevlies bei dem ausgehend von einem Spänevorrat ein Späne-Luft-Gemisch als Spänestrom gebildet wird, der in Vliesbreite auf einer unter dem Spänevorrat vorbeibewegten Unterlage abgelegt wird.The content of the invention is a method for controlling a transverse distribution for a chip fleece in which, based on a chip supply, a chip-air mixture is formed as a stream of chips, which is deposited in the width of the fleece on a base which is moved past under the chip supply.

Durch die europäische Patentanmeldung EP-A 69 162 ist ein Verfahren zur Beeinflussung der Dichteverteilung eines zu streuenden Spänevlieses und eine Vorrichtung hierzu bekannt geworden, die sich dadurch auszeichnet, daß mindestens aus einem Teilstrom über einen Teil seiner Breite entsprechend einer vorgegebenen Dichteverteilung eine sich hieraus ergebenden Teilmenge entnommen wird. Durch die Wegnahme einer Teilmenge aus einem kontinuierlich über die Breite sich erstreckenden Teilstroms wird zwar am Ort der Entnahme eine gewünschte Dichteverteilung erreicht, es wird jedoch eine weitere Vermischung durch nichtbeeinflußte Teilströme stattfinden, wodurch nur schwierig das gewünschte Ergebnis einer gleichförmigen, vorgegebenen Dichteverteilung im abgelegten Vlies erreicht wird.The European patent application EP-A 69 162 has disclosed a method for influencing the density distribution of a chip fleece to be scattered and a device for this purpose, which is characterized in that at least one partial stream over a part of its width corresponds to a predetermined density distribution Partial quantity is removed. By removing a partial quantity from a partial stream that extends continuously across the width, a desired density distribution is achieved at the point of removal, but further mixing by unaffected partial streams will take place, making the desired result of a uniform, predetermined density distribution in the deposited fleece difficult is achieved.

Durch die europäische Patentschrift 0 109 456 ist ein Verfahren und eine Vorrichtung zum Vergleichmäßigen der Dichteverteilung in einer Kunstholzplatte bekannt geworden, bei der in Abhängigkeit der über einen Austragsquerschnitt gemessenen Gewichtsverteilung des aus einem Vorrat ausgetragenen Schüttguts ein Abscheidebefehl für die in entsprechenden Teilquerschnitten vorhandenen, von einer vorgegebenen Solldichteverteilung abweichende Gewichtsmenge des Schüttguts für deren Abscheidung gebildet wird. Bei einem derartigen, Verfahren wird ebenfalls von einem Vorrat ausgegangen, der über die gesamte spätere Schüttbreite über Entnahmevorrichtungen ausgetragen wird, so daß Dichteschwankungen, die im Vorrat über die gesamte Breite vorhanden sind, ebenfalls Einfluß nehmen auf die abzunehmende Menge. Auch wenn hier bereits die abzunehmende Menge entsprechend dem erwarteten Profil, welches sich auf der Vliesunterlage aufbauen soll, gesteuert wird, ist es zufolge der zwangsläufig vorkommenden Ungleichförmigkeiten innerhalb des Vorrats nicht auszuschließen, daß vor der Ablage als Vlies eine neue Ungleichförmigkeit im Ablegeprofil der Späne auftritt. Zufolge der über die gesamte Breite des späteren Profils reichenden Austragsorganen für den gespeicherten Vorrat sind beim Stand der Technik Fehler nicht zu vermeiden.European patent 0 109 456 has disclosed a method and a device for equalizing the density distribution in a synthetic wood panel, in which, depending on the weight distribution of the bulk material discharged from a supply measured over a discharge cross-section, a separation command for those present in the corresponding partial cross-sections is issued by one predetermined target density distribution deviating weight quantity of the bulk material is formed for their separation. In such a method, it is also assumed that there is a supply which is discharged over the entire later bulk width via removal devices, so that fluctuations in density which are present in the supply over the entire width also influence the quantity to be taken off. Even if the quantity to be taken off is already controlled according to the expected profile that is to be built up on the non-woven base, it cannot be ruled out, due to the inevitably occurring irregularities within the supply, that a new non-uniformity occurs in the deposit profile of the chips before being deposited as a non-woven . Due to the discharge organs for the stored stock extending over the entire width of the later profile, errors cannot be avoided in the prior art.

Die EP-A 230 483, deren Anmeldetag vor der Hinterlegung der obigen Anmeldung liegt, und dies am 05.08.1987 im Patentblatt veröffentlicht wurde, offenbart ein Verfahren zum Steuern einer Querverteilung für ein Spänevlies, bei dem ausgehend von einem Spänestrom gebildet wird, der in Vliesbreite auf einer unter dem Spänevorrat vorbeibewegten Unterlage abgelegt wird, bei dem der Spänestrom in zwei Teilströme aufgeteilt wird, wobei die Stromrichtung des anddren Teilstroms entgegengesetzt dazu verläuft, und bei dem dem KTeilstrom an einer Vielzahl von über die Vliesbreite verteilten Entnahmestellen, die in einem Bereich seitlich und am unteren Ende eines Stranges von Übergabewalzen angeordnet sind, Teilmengen nach Maßgabe einer über die Vliesbreite gleichmäßige bzw. vorgegebenen Vlieshöhenverteilung entnommen werden können.EP-A 230 483, the filing date of which lies before the filing of the above application and which was published in the patent sheet on August 5, 1987, discloses a method for controlling a transverse distribution for a chip fleece, which is based on a chip flow which is formed in Fleece width is deposited on a mat that is moved past under the chip supply, in which the chip flow is divided into two partial streams, the direction of flow of the other partial stream runs in the opposite direction, and in which the K partial stream is located at a plurality of removal points distributed over the fleece width, which are in one area are arranged laterally and at the lower end of a strand of transfer rollers, partial quantities can be removed in accordance with a uniform or predetermined fleece height distribution over the fleece width.

Der vorliegenden Erfindung liegt ebenfalls die Aufgabe zugrunde, Fehler, die durch Austragsorgane in der Quenrerteilung des Spänevlieses verursacht werden, auszuschalten sowie eine Kontrolle und Steuerung der Querverteilung durchzuführen. Gegenüber der Lösung nach der EP-A 230 483 unterscheidet sich die Lösung der Aufgabe gemäß vorliegender Anmeldung durch folgende Verfahrensmerkmale: der Spänestrom wird zunächst in zwei Teilströme aufgeteilt, bei dem jeder Teilstrom anschließend mittels kaskadenförmig und schräg zur quer zur Vliesrichtung verlaufenden Vertikalebene angeordneten aus Stäben bestehenden Rechen in weitere sich erneut vermischende Teilströme aufgeteilt wird, und bei dem an einem weiteren Teilstrom am unteren Ende einer Kaskade Teilmengen entnommen werden. Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Anspruchs I gelöst. Durch Aufteilen des vom Vorrat über die gesamte Streubreite entnommenen Streumaterials und durch Richtungsänderungen der einzelnen Partikel werden die, durch die Entnahmeeinrichtungen verursachten Fehler beseitigt. Es erfolgt eine quasi gleichförmige Ausrichtung von ungleich in eine Kaskade einfallenden Späneteilchen. Damit kann über die vorgegebene Vliesverteilungskurve bei Ablage des Vlieses eine richtige Entnahme aus dem gleichförmigen Späneschleier vorgenommen werden.The present invention is also based on the object of eliminating errors which are caused by discharge elements in the transverse distribution of the chip fleece and of carrying out a control and control of the transverse distribution. Compared to the solution according to EP-A 230 483, the solution to the object according to the present application differs by the following procedural features: the chip flow is initially divided into two partial flows, in which each partial flow is subsequently made up of bars arranged in a cascade-shaped manner and obliquely to the vertical plane running transversely to the fleece direction existing rakes are divided into further partial streams that mix again, and partial quantities are taken from a further partial stream at the lower end of a cascade. This object is achieved with the characterizing features of claim I. The errors caused by the removal devices are eliminated by dividing the spreading material removed from the supply over the entire spreading width and by changing the direction of the individual particles. There is a quasi-uniform alignment of chip particles that fall unevenly into a cascade. This allows correct removal from the uniform chip veil to be carried out via the predetermined fleece distribution curve when the fleece is deposited.

Durch die deutsche Offenlegungsschrift 2 942 163 ist ein Verfahren und eine Vorrichtung zum Aufteilen eines Förderstromes bekannt geworden, das sich dadurch auszeichnet, daß der Förderstrom kontinuierlich einem Stromteiler zugeführt wird und das stetige Teilströme entlang dem Stromteiler und mehrere stetig durch den Stromteiler gefördert werden. Mit einem derartigen Verfahren und einer Vorrichtung zur Durchführung des Verfahrens werden diesem Stromteiler zugeführte Spänemengen zwar exakt aufgeteilt, es werden jedoch auch hierdurch die im Streugut vorhandenen Verteilfehler über eine Verteilschurre weitergegeben. Die der Erfindung zugrundeliegende Aufgabe wird ausgehend von dem so bekannt gewordenen Stand der Technik durch die kennzeichnenden Merkmale des Anspruchs 2 gelöst. Durch Anordnung von sich nicht durchdringenden Rechenpaaren in Kaskaden wird ein Auflösen des ungleichförmigen Spänestroms erreicht, da jedes Teilchen des Spänestroms in seiner Strömungsrichtung mindestens einmal abgelenkt wird und somit zu einer gleichmäßigen Vermischung mit den anderen Teilchen geführt wird. Weiterhin ist im Bereich der letzten Kaskade eine mit verschließbaren Öffnungen versehene Aufnahmevorrichtung vorgesehen; ein von einer Lichtquelle ausgesandter Lichtstrahl trifft das Spänevlies über dessen Breite quer zur Fortschrittsrichtung; eine Videokamera nimmt diesen Lichtstrahl auf und gibt diese Information an einen Rechner weiter, in dem Steuerinformationen für die Aufnahmevorrichtung abgeleitet werden. Eine derartige Vorrichtung erzeugt ein über die Breite gesehen völlig gleichmässiges Spänevlies auf einer Unterlage. Hierbei wird angenommen, daß bei gleicher Schütthöhe auch die Schüttdichte bei Verwendung gleichförmigen Materials konstant ist. Soll nun eine vorgegebene Schütthöhe, die vergleichbar mit einer vorgegebenen Schüttdichte ist, erzeugt und kontrolliert werden, so wird dies ebenfalls durch die kennzeichnenden Merkmale des Anspruchs 2 erreicht.The German published patent application 2 942 163 discloses a method and a device for dividing a conveying flow, which is characterized in that the conveying flow is continuously fed to a flow divider and the continuous partial flows along the flow divider and several are continuously conveyed through the flow divider. With such a method and a device for carrying out the method, chip quantities supplied to this current divider are exactly divided, but this also means that the distribution errors present in the spreading material are passed on via a distribution chute. The object on which the invention is based is achieved on the basis of the state of the art which has become so well known by the characterizing features of claim 2. The arrangement of non-penetrating computing pairs in cascades results in the dissolution of the non-uniform chip flow, since each particle of the chip flow is deflected at least once in its direction of flow and thus leads to a uniform mixing with the other particles. Furthermore, a receiving device provided with closable openings is provided in the area of the last cascade; a beam of light emitted by a light source strikes the chip fleece across its width across the direction of progress; a video camera records this light beam and passes this information on to a computer in which control information for the recording device is provided be tested. Such a device produces a chip fleece that is completely uniform across the width on a base. It is assumed here that the bulk density is constant when using uniform material with the same bed height. If a predetermined bulk height, which is comparable to a predetermined bulk density, is to be generated and controlled, this is also achieved by the characterizing features of claim 2.

Wie in Anspruch 3 unter Schutz gestellt, ist in der Aufnahmevorrichtung eine Fördervorrichtung vorgesehen. Hierdurch ist es erfindungsgemäß zum einen möglich, die in der Aufnahmevorrichtung vorhandene Teilmenge zurückzutransportieren oder erfindungsgemäß gleichmäßig über die Streubreite zu verteilen und durch Anordnung eines Wehres, welches über die gesamte Vliesbreite sich erstreckt, ein gleichmäßiges Auftragen einer Vliesschicht entweder unterhalb des aufzubauenden Vlieses oder auf das aufgebaute Vlies aufzulegen.As protected in claim 3, a conveyor device is provided in the receiving device. This makes it possible, according to the invention, on the one hand, to transport back the partial quantity present in the receiving device or, according to the invention, to distribute it evenly over the spreading width and by arranging a weir which extends over the entire width of the fleece, a uniform application of a fleece layer either below the fleece to be built up or onto it put on the fleece.

Wird das so gewonnene Vlies zusammen mit zusätzlichen Deckschichten versehen, wird gemäß Anspruch 4 erfindungsgemäß mindestens eine Streuwalze zusätzlich unter der letzten Kaskade vorgesehen. Hierdurch wird erreicht, daß im Übergangsbereich zu den Deckschichten eine leicht Separierung der Späne erfolgt. Darüberhinaus wird gleichzeitig ein Abbremsen und Flachlegen der Späne unterstützt.If the nonwoven obtained in this way is provided with additional cover layers, according to the invention at least one spreader roller is additionally provided under the last cascade. This ensures that the chips are easily separated in the transition area to the cover layers. In addition, braking and flattening of the chips is supported at the same time.

In noch weiterer Ausgestaltung des Erfindungsgegenstandes trägt die Aufnahmevorrichtung durch Stege voneinander getrennte verschließbare Öffnungen, die mit dem mit ihr zusammenwirkenden Rechen gegeneinander quer zur Vliesrichtung verschiebbar sind.In yet another embodiment of the subject matter of the invention, the receiving device has closable openings separated by webs, which can be displaced with respect to one another transversely to the nonwoven direction with the rake interacting with them.

In noch weiterer Ausgestaltung des Erfindungsgegenstandes wird vorgeschlagen, daß die Stege der Aufnahmevorrichtung als Rechen ausgebildet sind.In yet another embodiment of the subject matter of the invention, it is proposed that the webs of the receiving device are designed as rakes.

Eine besonders vorteilhafte Ausgestaltung besteht darin, daß zwei übereinander und über der Aufnahmvorrichtung vorgesehene Rechen quer zur Vliesrichtung gegeneinander verschiebbar sind. Durch diese Anordnung ist in einfachster Form eine Regelung der Öffnungsbreite in die Aufnahmevorrichtung möglich, was zwangsläufig zu einer Regelung der Aufnahmemenge führt.A particularly advantageous embodiment consists in that two rakes provided one above the other and above the receiving device can be displaced relative to one another transversely to the fleece direction. This arrangement allows the opening width into the receiving device to be regulated in the simplest form, which inevitably leads to a regulation of the receiving amount.

Zur Kontrolle der vorgegebenen Vlieshöhe wird erfindungsgemäß eine Einrichtung vorgeschlagen, bei der die über einer Plattenlänge entsprechende Vlieslänge aufgenommenen Lichtstriche über die Breite des Vlieses im Rechner gespei chert und anschließend die Plattenoberfläche in einem den Höhenschichten zugeordneten Farbraster auf einem Monitor dargestellt werden. In Ausgestaltung dieses Erfindungsgedankens, insbesondere bei vorgesehener, sich ändernder Vliesoberfläche wird vorgeschlagen, daß nicht ein, sondern mehrere Lichtstriche über die gesamte Vliesbreite ausgesandt werden. Hierdurch wird erreicht, daß bei feststehender Videokamera auch Vlieshöhenänderungen von derselben Kamera aufgenommen werden können.To control the predetermined fleece height, a device is proposed according to the invention in which the light lines recorded over a length of the fleece are stored in the computer over the width of the fleece and then the surface of the plate is displayed in a color grid assigned to the height layers on a monitor. In an embodiment of this inventive concept, in particular when the nonwoven surface changes, it is proposed that not one but several light lines are emitted over the entire width of the nonwoven. This ensures that changes in fleece height can also be recorded by the same camera when the video camera is stationary.

In der nachfolgenden Beschreibung wird die Erfindung anhand eines Ausführungsbeispiels näher erläutert. Es zeigen:

  • Fig. I eine Gesamtansicht des Erfindungsgegenstandes mit Kontrolleinrichtung
  • Fig. 2 die erfindungsgemäße Rechenaufteilvorrichtungen
  • Fig. 3 eine erfindungsgemäße Ausgestaltung einer Aufnahmevorrichtung und
  • Fig. 4 verschiebbare Abdeckungen vor den Öffnungen der Aufnahmevorrichtung
In the following description, the invention is explained in more detail using an exemplary embodiment. Show it:
  • Fig. I is an overall view of the subject of the invention with control device
  • 2 shows the computing division devices according to the invention
  • Fig. 3 shows an embodiment of a receiving device according to the invention and
  • Fig. 4 sliding covers in front of the openings of the receiving device

Gleiche Gegenstände werden in den einzelnen Figuren mit denselben Bezugszeichen versehen.The same objects are provided with the same reference symbols in the individual figures.

In Fig. I wird aus einem nicht dargestellten Spänevorrat über eine Rechenartige Aufteilvorrichtung I zu streuendes Schüttgut 2 für die Herstellung von Spanplatten, Waverboard und OSB-Platten über eine Verteilschurre 3 den in einem Gehäuse 4 befindlichen Rechenpaaren 5, 6, 7 zugeführt. Die Rechenpaare bestehen aus jeweils über die Vliesbreite sich erstreckenden, mit Abständen zueinander angeordneten Stäben gleicher Länge, die bevorzugt mit je einem Ende an Querstäben 8 befestigt sind. Die Querstäbe 8 erstrecken sich ebenfalls über die gesamte Breite des Gehäuses 4, welches der Vliesbreite angepaßt ist.In FIG. 1, bulk material 2 to be scattered from a chip supply (not shown) via a rake-like dividing device I for the production of chipboard, waverboard and OSB boards is fed via a distribution chute 3 to the rake pairs 5, 6, 7 located in a housing 4. The rake pairs each consist of rods of the same length that extend over the width of the fleece and are spaced from one another and are preferably attached to cross rods 8 with one end each. The cross bars 8 also extend over the entire width of the housing 4, which is adapted to the fleece width.

Die in Fig. I angegebene Anzahl und die Neigung der Rechen stellt lediglich ein Ausführungsbeispiel dar. Es können entsprechend dem zu vergleichmä- ßigenden Gut auch mehrere Kaskaden untereinander vorgesehen werden. Hierbei bildet das Rechenpaar 5 die erste Kaskade, während die Rechenpaare 6 und 7 die zweite Kaskade bilden. Erfindungsgemäß wird die Neigung der Rechenpaare zueinander über die Querstäbe 8 von außerhalb des Gehäuses 4 eingeleitet.The number shown in FIG. 1 and the inclination of the rakes represent only one exemplary embodiment. Several cascades with one another can also be provided in accordance with the goods to be compared. Here, the computing pair 5 forms the first cascade, while the computing pairs 6 and 7 form the second cascade. According to the invention, the inclination of the pairs of rakes to one another is initiated via the cross bars 8 from outside the housing 4.

Im Ausführungsbeispiel nach Fig. I sind zwei Streuwalzen 9 unterhalb der letzten Kaskade angeordnet. Diese dienen dazu, das gleichmäßig verteilte Gut in seiner Fallrichtung zu ändern und zu bremsen und/oder eine leichte Separierung des Spangutes zu erreichen, wenn eine Spanplatte oder eine OSB-Platte aus mehreren Spanschichten hergestellt wird und die vorliegende Einrichtung, beispielsweise für die Herstellung der Mittelschicht verwendet wird.In the exemplary embodiment according to FIG. I, two spreader rollers 9 are arranged below the last cascade. These are used to change and brake the evenly distributed material in its direction of fall and / or to achieve a simple separation of the chip material if a chipboard or an OSB board is produced from several chip layers and the present device, for example for the production of the Middle class is used.

Im Falle der Herstellung einer Spanplatte aus mehreren Schichten können derartige Auflösevorrichtungen, wie sie in Fig. I beschrieben sind, hintereinander angeordnet sein, wobei das erste und dritte Gehäuse, beispielsweise bei der Herstellung von Dreischichtplatten, keine Streuwalzen 9 besitzt, während das zweite Gehäuse an seinem Austritt 10 Streuwalzen 9 besitzt.In the case of the production of a chipboard from several layers, such dissolving devices as described in FIG. I can be arranged one behind the other, the first and third housings, for example in the production of three-layer boards, having no spreader rollers 9, while the second housing is on its outlet has 10 spreader rollers 9.

In Fig. ist auch an einem Rechen des Rechenpaares 7 eine Aufnahmevorrichtung 11 vorgesehen, durch die zuviel gestreutes Gut aufgenommen wird. Die Funktion dieser Aufnahmevorrichtung wird im Zusammenhang mit Fig. 2 näher erläutert. Die Anordnung der Aufnahmevorrichtung gemäß Fig. I vor dem in Richtung des sich auf einer Unterlage aufbauenden Vlieses am wetesten stromabliegenden Rechens stellt nur ein Ausführungsbeispiel dar. Die Aufnahmevorrichtung II kann genauso hinter dem in Richtung des sich auf einer Unterlage aufbauenden Vlieses (Vliesrichtung) am weitesten stromaufliegenden Rechen, in diesem Fall dem linken Rechen des Rechenpaares 8, befinden.In FIG. 1 a pick-up device 11 is also provided on a rake of the pair of rakes 7, by means of which too much scattered material is picked up. The function of this receiving device is explained in more detail in connection with FIG. 2. The arrangement of the receiving device according to FIG. I in front of the rake which is the most downstream in the direction of the fleece which is built up on a base only sets The receiving device II can also be located behind the rake which is the most upstream in the direction of the fleece which is built up on a base (fleece direction), in this case the left rake of the pair of rakes 8.

Unter dem sich über die gesamte Streubreite erstreckenden Gehäuse 4 ist eine Vliesaufnahmevorrichtung 12 dargestellt. Dabei kann die Vliesaufnahmevorrichtung 12 aus einem über die Breite des Spänevlieses sich erstreckenden Förderband handeln oder um sich überlappende flexible oder starre Unterlagen oder einer Kombination derartiger Vliesträger. Die Vliesaufnahmevorrichtung 12 bewegt sich in Richtung eines Pfeiles 13, so daß am linken Ende des Gehäuses 4 die endgültige Vlieshöhe 14 für das unter diesem Gehäuse entstandene Vlies erreicht ist.A fleece holding device 12 is shown below the housing 4, which extends over the entire spreading width. The fleece receiving device 12 can be a conveyor belt that extends over the width of the chip fleece or overlapping flexible or rigid underlays or a combination of such fleece carriers. The fleece receiving device 12 moves in the direction of an arrow 13, so that the final fleece height 14 for the fleece formed under this housing is reached at the left end of the housing 4.

Ein Lichtstrahl 15, der ebenfalls über die gesamte Breite des Vlieses 16 auf die Vliesoberfläche projiziert wird, erzeugt in einer Videokamera 17 ein Bild über die Vlieshöhe 14. Dieses so erzeugte Bild wird einem Rechner 18 zugeführt. Stimmt die über die Vliesbreite aufgenommene Vlieshöhe 14 mit einer vorgegebenen Vlieshöhe überein, wird kein Steuerbefehl 19 an einen Verstellmechanismus 20 (vgl. Fig. 3) in der Aufnahmevorrichtung II weitergegeben. Durch einen an den Rechner 18 angeschlossenen ersten Monitor 21 wird der Verlauf der Vlieshöhe über die Breite eines gestreuten Vlieses dargestellt und auf einem zweiten Monitor 22 werden hieraus die Höhenschichten in einem Raster über die Länge einer fertigen Spanplatte abgebildet.A light beam 15, which is likewise projected over the entire width of the fleece 16 onto the fleece surface, generates an image of the fleece height 14 in a video camera 17. This image thus generated is fed to a computer 18. If the fleece height 14 picked up over the fleece width corresponds to a predetermined fleece height, no control command 19 is passed on to an adjustment mechanism 20 (see FIG. 3) in the receiving device II. The course of the fleece height over the width of a scattered fleece is represented by a first monitor 21 connected to the computer 18, and the height layers are shown on a second monitor 22 in a grid over the length of a finished chipboard.

Wird anstelle eines Lichtstrahls 15 erfindungsgemäß eine Vielzahl von Lichtstrahlen 15 von einer feststehenden Lichtquelle 23 ausgesandt bzw. auf die Vliesoberfläche projiziert, so können bei feststehender Videokamera 17 Vliesoberflächen aufgenommen werden, die sich in ihrer Höhe wesentlich voneinander unterscheiden, ohne daß dadurch die Streugenauigkeit vermindert wird.If, instead of a light beam 15, according to the invention a plurality of light beams 15 are emitted from a fixed light source 23 or projected onto the nonwoven surface, 17 nonwoven surfaces can be recorded with a fixed video camera which differ significantly in height without the scattering accuracy being reduced thereby .

Das in das Gehäuse 4 gemäß Fig. 2 über eine rechenartige Aufteilvorrichtung I einfallende Schüttgut 2 wird über die Verteilschurre 3 aufgeteilt. Hierbei werden die Fehler des Teils des nicht umgelenkten Schüttguts 2 bis zum Ende der Verteilschurre vorhanden bleiben. Trifft nun ein so mit Fehlern versehener Teilstrom 25 auf das Rechenpaar 5 auf, so wird dieser durch den rechten Rechen des Rechenpaares 5 in einen weiteren Teilstrom 26 und den bisherigen Teilstrom 25 aufgelöst. Der weitere Teilstrom 26 teilt sich am linken Rechen des Rechenpaares 7 noch einmal auf, so daß hierdurch evtl. an der Verteilschurre 3 vorhandene Ungleichförmigkeiten ausgeglichen sind. Der Teilstrom 25, der noch Verteilfehler von der Verteilschurre 3 besitzen könnte, wird in den Bereich der Aufnahmevorrichtung II, die ebenfalls über die gesamte spätere Vliesbreite sich erstreckt, kommen. Nachdem die Aufnahmevorrichtung mit dem rechten Teil des Rechenpaares 7 im Ausführungsbeispiel gemäß Fig. 2 zusammenarbeitet, erfolgt auch hier eine Aufteilung des Teilstroms 25. Hierdurch ist der über die Verteilschurre 3 ankommende Verteilfehler bereits so gering geworden, daß dieser Fehler als praktisch ausgeglichen angesehen werden kann. Wird jedoch eine höhere Genauigkeit verlangt, so ist es jederzeit möglich, in Abhängigkeit der verlangten Genauigkeit noch weitere Kaskadenstufen hinzuzufügen.The bulk material 2 falling into the housing 4 according to FIG. 2 via a rake-like dividing device I is divided up via the distribution chute 3. The errors of the part of the non-redirected bulk material 2 will remain until the end of the distribution chute. If a partial stream 25 thus provided with errors strikes the computing pair 5, this is resolved into a further partial stream 26 and the previous partial stream 25 by the right computing unit of the computing pair 5. The further partial stream 26 divides again on the left rake of the computing pair 7, so that any irregularities present on the distribution chute 3 are thereby compensated. The partial flow 25, which could still have distribution errors from the distribution chute 3, will come into the area of the receiving device II, which also extends over the entire later fleece width. After the receiving device cooperates with the right part of the computing pair 7 in the exemplary embodiment according to FIG. 2, the partial stream 25 is also divided here. As a result, the distribution error arriving via the distribution chute 3 has already become so small that this error can be regarded as practically balanced . However, if higher accuracy is required, it is possible at any time to add further cascade levels depending on the required accuracy.

Entsprechend den Steuerbefehlen 19 werden Öffnungen 27 der Aufnahmevorrichtung entsprechend einem Doppelpfeil 28 mehr oder weniger geöffnet, so daß die zuviel auf tretende Menge von dem nicht dargestellten Vorrat abgegebenes Schüttgut in die Aufnahmevorrichtung II einfließen kann.In accordance with the control commands 19, openings 27 of the receiving device are opened more or less according to a double arrow 28, so that the excess quantity of bulk material discharged from the supply (not shown) can flow into the receiving device II.

In der Aufnahmevorrichtung II ist eine Verteilschnecke 29 vorgesehen, durch die das einfallende Gut abtransportiert werden kann. Anstelle des Rücktransportes des zuviel ausgegebenen Schüttguts in den Vorrat kann wie in Fig. 3 näher dargestellt eine senkrecht zur Bildebene hin und her bewegte Fördereinrichtung (99) zum Vergleichmäßigen von zuviel geschüttetem Gut 30 innerhalb der Aufnahmevorrichtung dienen. Besitzt die Aufnahmevorrichtung II in ihrem unteren Teil eine Überfallkante 31, so wird hierdurch das zuviel geschüttete Gut 30 austreten und je nach Anordnung der Aufnahmevorrichtung stromab oder stromauf im Bereich der letzten Kaskade als Vliesunterlage oder als Vliesauflage abgelegt.A distribution screw 29 is provided in the receiving device II, through which the incoming material can be transported away. Instead of returning the excess bulk material to the supply, a conveyor device (99), which is moved back and forth perpendicularly to the image plane, can serve, as shown in more detail in FIG. 3, to even out excess bulk material 30 within the receiving device. If the receiving device II has an overflow edge 31 in its lower part, the overpoured material 30 will thereby emerge and, depending on the arrangement of the receiving device, be placed downstream or upstream in the area of the last cascade as a nonwoven underlay or as a nonwoven underlay.

Claims (9)

1. A method of controlling lateral distribution for a mat, in which a mixture of chips and air originating from a supply of chips is formed as a stream of chips which is deposited in the width of the mat on a base moved past below the supply of chips,
in which the stream of chips is first split up into two component streams, the direction of flow of one component stream extending in the direction of movement of the base, and the direction of flow of the other component stream extending in the opposite direction thereto,
in which each component stream is subsequently split up into further component streams, which again intermix, by means of rakes comprising bars and disposed in a cascade-like manner and obliquely to the vertical plane extending transversely to the direction of the mat, and
in which, according to a vertical distribution of the mat which is uniform or prescribed over the width of the mat, partial quantities may be removed from a further component stream at a plurality of removal points which are distributed across the width of the mat and disposed in one region laterally and at the bottom end of a cascade.
2. An apparatus for controlling a mat (16) from a supply in a width corresponding to the width of the mat onto a base (12) moved through below the supply, corresponding to a vertical distribution (14) of the mat predetermined in the mat transversely to the direction of the mat, having a rake-like splitting- up device (1) disposed between supply and mat base (12), and a distributing runway (3), characterised in that at least one pair of non-interdigitating rakes (5) sloping towards to one another is disposed below and beyond the distributing runway (3), that a further pair of non-interdigitating rakes (6, 7) sloping towards one another is disposed as the next cascade downstream beyond and below each rake of the pair of rakes (5), that an encased reception device (11) provided with closable apertures and extending across the width of scatter is provided in the region of the end of the last cascade beyond or in front of the rake located furthest upstream or downstream in the direction of the mat building up on a base (direction of the mat), and that a beam of light (15) emanating from a source of light (23) impinges on the mat (16) across its width transversely to the direction of advance (13), that a video camera (17) receives this line of light and passes this information to a computer (18) in which control information (19) for the reception device (11) is derived.
3. An apparatus as claimed in claim 2, characterised in that an encased reception device (11) provided with closable apertures and extending across the width of scatter is provided in the region of the end of the last cascade beyond or in front of the rake located furthest upstream or downstream in the direction of the mat building up on a base (direction of the mat).
4. An apparatus as claimed in claim 2, characterised in that a conveyor (29) is provided in the reception device (11).
5. An apparatus as claimed in claim 2, characterised in that at least one scattering roller (9) is provided below the last cascade.
6. An apparatus as claimed in one of the preceding claims, characterised in that the reception device (11) is provided with closable apertures separated from one another by bridges, and that the said apertures are displaceable relative to one another transversely to the direction of the mat with the rake cooperating with them.
7. An apparatus as claimed in claim 5, characterised in the bridges are in the form of rakes.
8. An apparatus as claimed in one of the claims 2, 3, characterised in that two rakes provided one above the other and above the reception device (11) are displaceable relative to one another transversely to the direction of the mat.
9. An apparatus as claimed in one of the preceding claims, characterised in that the lines of light across the width of the mat, and recorded across mat length corresponding to a board length, are stored in the computer (18), and the surface of the board is subsequently displayed in vertical layers on a monitor (21 or 22).
EP87107526A 1987-05-23 1987-05-23 Fibre felt strewing method Expired - Lifetime EP0292581B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE8787107526T DE3766247D1 (en) 1987-05-23 1987-05-23 METHOD FOR SPREADING A CHIP FLEECE
AT87107526T ATE58325T1 (en) 1987-05-23 1987-05-23 METHOD OF SPREADING A CHIP MAT.
EP87107526A EP0292581B1 (en) 1987-05-23 1987-05-23 Fibre felt strewing method
US07/191,041 US4931243A (en) 1987-05-23 1988-05-06 Process and apparatus for spreading a chip web
FI882166A FI85959C (en) 1987-05-23 1988-05-10 Procedure for spreading a chipboard
CA000566410A CA1300552C (en) 1987-05-23 1988-05-10 Process and apparatus for spreading a chip web

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87107526A EP0292581B1 (en) 1987-05-23 1987-05-23 Fibre felt strewing method

Publications (2)

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EP0292581A1 EP0292581A1 (en) 1988-11-30
EP0292581B1 true EP0292581B1 (en) 1990-11-14

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EP87107526A Expired - Lifetime EP0292581B1 (en) 1987-05-23 1987-05-23 Fibre felt strewing method

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US (1) US4931243A (en)
EP (1) EP0292581B1 (en)
AT (1) ATE58325T1 (en)
CA (1) CA1300552C (en)
DE (1) DE3766247D1 (en)
FI (1) FI85959C (en)

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Also Published As

Publication number Publication date
CA1300552C (en) 1992-05-12
EP0292581A1 (en) 1988-11-30
FI882166A0 (en) 1988-05-10
FI85959B (en) 1992-03-13
US4931243A (en) 1990-06-05
ATE58325T1 (en) 1990-11-15
FI85959C (en) 1992-06-25
DE3766247D1 (en) 1990-12-20
FI882166A (en) 1988-11-24

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