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EP0292581A1 - Fibre felt strewing method - Google Patents

Fibre felt strewing method Download PDF

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Publication number
EP0292581A1
EP0292581A1 EP87107526A EP87107526A EP0292581A1 EP 0292581 A1 EP0292581 A1 EP 0292581A1 EP 87107526 A EP87107526 A EP 87107526A EP 87107526 A EP87107526 A EP 87107526A EP 0292581 A1 EP0292581 A1 EP 0292581A1
Authority
EP
European Patent Office
Prior art keywords
fleece
width
supply
felt
receiving device
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.)
Granted
Application number
EP87107526A
Other languages
German (de)
French (fr)
Other versions
EP0292581B1 (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
Original Assignee
Carl Schenck AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Schenck AG filed Critical Carl Schenck AG
Priority to DE8787107526T priority Critical patent/DE3766247D1/en
Priority to EP87107526A priority patent/EP0292581B1/en
Priority to AT87107526T priority patent/ATE58325T1/en
Priority to US07/191,041 priority patent/US4931243A/en
Priority to CA000566410A priority patent/CA1300552C/en
Priority to FI882166A priority patent/FI85959C/en
Publication of EP0292581A1 publication Critical patent/EP0292581A1/en
Application granted granted Critical
Publication of EP0292581B1 publication Critical patent/EP0292581B1/en
Anticipated expiration legal-status Critical
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 invention relates to a method for spreading a chip fleece from a supply in a width corresponding to the fleece width onto a base moving under the supply in accordance with a fleece height distribution predetermined in the fleece transversely to the fleece direction.
  • a method for influencing the density distribution of a chip fleece to be scattered and a device for this purpose have become known from European patent specification 0 068 l62, which is characterized in that a partial quantity resulting therefrom is drawn from at least one partial flow over part of its width in accordance with a predetermined density distribution becomes.
  • European patent specification 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 by a discharge cross section, a separation command for those present in the corresponding partial cross sections is issued by one predetermined target density distribution different weight of the bulk material for their separation ge is forming.
  • a separation command for those present in the corresponding partial cross sections is issued by one predetermined target density distribution different weight of the bulk material for their separation ge is forming.
  • the present invention is 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. This object is achieved with the characterizing features of claim 1.
  • 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 falling 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.
  • a method and a device for dividing a conveying flow have become known from the German laid-open specification 29 42 l63, which is characterized in that the conveying flow is continuous Current divider is supplied and the steady partial flows along the flow divider and several are continuously promoted by 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 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 a light beam emitted by a light source strikes the chip fleece across its width across the direction of progress, that a video camera records this light line and passes this information on to a computer by deriving control information for the recording device that the lines of light recorded over a length of the fleece correspond to the width of the fleece in the computer and then the plate surface is displayed in a color grid assigned to the height layers on a monitor.
  • a light beam emitted by a light source strikes the chip fleece across its width across the direction of progress, that a video camera records this light line and passes this information on to a computer by deriving control information for the recording device that the lines of light recorded over a length of the fleece correspond to the width of the fleece in the computer and then the plate surface is displayed in a color grid assigned to the height layers on a monitor.
  • FIG. 1 bulk material 2 to be scattered from a chip supply (not shown) via a rake-like dividing device 1 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 pairs of rakes 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 extend flat if 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 serve to change and evenly brake the evenly distributed material in its direction of fall and / or to achieve a simple separation of the chip material if a particle board or an OSB plate is produced from several chip layers and the present device, for example for the production of the Middle class is used.
  • 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 supporting device 11 can also be located behind the rake which is the most upstream in the direction of the nonwoven which is built up on a support (in this case, the left rake of the computing pair 8).
  • a fleece holding device 12 is shown below the housing 4, which extends over the entire spreading width.
  • the fleece receiving device l2 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 l2 moves in the direction of an arrow l3, so that the final fleece height l4 for the fleece formed under this housing is reached at the left end of the housing 4.
  • This image generated in this way is fed to a computer 18.
  • the fleece height l4 picked up over the fleece width corresponds to a predetermined fleece height
  • no control command l9 is passed on to an adjustment mechanism 20 (cf. FIG. 3) in the pick-up device 11.
  • the course of the fleece height over the width of a scattered fleece is represented by a first monitor 2l connected to the computer l8, and the height layers are shown on a second monitor 22 in a grid over the length of a finished chipboard.
  • a plurality of light beams l5 from a fixed one If the light source 23 is emitted or projected onto the nonwoven surface, then with a fixed video camera l7 nonwoven surfaces can be recorded 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 1 is divided 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-hand 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 11, 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 .
  • openings 27 of the receiving device are opened more or less according to a double arrow 28, so that they open too much occurring quantity of bulk material discharged from the supply, not shown, can flow into the receiving device 11.
  • a distribution screw 29 is provided in the receiving device 11, through which the incoming material can be transported away.
  • 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 11 has an overflow edge 3l in its lower part, the excess material 30 that has been poured over will 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Dental Preparations (AREA)
  • Pens And Brushes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Control Of Conveyors (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)
  • Collation Of Sheets And Webs (AREA)

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 betrifft ein Verfahren zum Streuen eines Spänevlieses aus einem Vorrat in einer der Vliesbreite entsprechenden Breite auf eine sich unter dem Vorrat hindurchbewegende Unterlage entsprechend einer im Vlies vorgegebenen Vlieshöhenverteilung quer zur Vlies­richtung.The invention relates to a method for spreading a chip fleece from a supply in a width corresponding to the fleece width onto a base moving under the supply in accordance with a fleece height distribution predetermined in the fleece transversely to the fleece direction.

Durch die europäische Patentschrift 0 068 l62 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 gewünschten Ergebnis einer gleichförmigen, vorgegebenen Dichteverteilung im abge­legten Vlies erreicht wird.A method for influencing the density distribution of a chip fleece to be scattered and a device for this purpose have become known from European patent specification 0 068 l62, which is characterized in that a partial quantity resulting therefrom is drawn from at least one partial flow over part of its width in accordance with a predetermined density distribution becomes. 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 l09 456 ist ein Verfahren und eine Vorrichtung zum Vergleichmäßigen der Dichteverteilung in einer Kunstholzplatte bekannt ge­worden, bei der in Abhänigkeit 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 ge­ bildet 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 specification 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 by a discharge cross section, a separation command for those present in the corresponding partial cross sections is issued by one predetermined target density distribution different weight of the bulk material for their separation ge is forming. In such a method, it is also assumed that there is a supply which is discharged over the entire subsequent bulk width via removal devices, so that fluctuations in density which are present in the supply over the entire width also have an influence on 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 nonwoven base, it cannot be ruled out due to the inevitably occurring irregularities within the supply that a new nonuniformity occurs in the deposit profile of the chips before being deposited as a nonwoven . As a result of the discharge members for the stored stock extending over the entire width of the later profile, errors cannot be avoided in the prior art.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, Fehler, die durch Austragsorgane in der Querverteilung des Spänevlieses verursacht werden, auszuschalten sowie eine Kontrolle und Steuerung der Querverteilung durch­zuführen. Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Anspruchs l 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 gleichförmige Späne­schleier vorgenommen werden.The present invention is 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. This object is achieved with the characterizing features of claim 1. 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 falling 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 29 42 l63 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 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. 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 werden, so wird dies durch die kennzeichnenden Merkmale des Anspruchs 3 erreicht.A method and a device for dividing a conveying flow have become known from the German laid-open specification 29 42 l63, which is characterized in that the conveying flow is continuous Current divider is supplied and the steady partial flows along the flow divider and several are continuously promoted by 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. By arranging non-penetrating computing pairs, a dissolution of the non-uniform chip flow is achieved, since each particle of the chip flow is deflected in its flow direction at least once and is therefore mixed uniformly with the other particles. 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 that is comparable to a predetermined bulk density is now to be generated, this is achieved by the characterizing features of claim 3.

Wie in Anspruch 4 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 4, 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 5 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 fleece 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 ein von einer Lichtquelle ausgesandter Lichtstrahl das Spä­nevlies über dessen Breite quer zur Fortschrittsrich­tung trifft, daß eine Videokamera diesen Lichtstrich aufnimmt und diese Information an einen Rechner weiter­gibt, indem Steuerinformationen für die Aufnahmevor­richtung abgeleitet werden, daß 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 specified fleece height, a device is proposed according to the invention in which a light beam emitted by a light source strikes the chip fleece across its width across the direction of progress, that a video camera records this light line and passes this information on to a computer by deriving control information for the recording device that the lines of light recorded over a length of the fleece correspond to the width of the fleece in the computer and then the plate surface is displayed in a color grid assigned to the height layers on a monitor. In an embodiment of this idea of the invention, in particular in the case of a provided, changing fleece surface, it is proposed that not one but several light lines are emitted over the entire width of the fleece. 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. l 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. L is an overall view of the subject of the invention with control device
  • 2 shows the computing division devices according to the invention
  • 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. l wird aus einem nicht dargestellten Spänevor­rat über eine Rechenartige Aufteilvorrichtung l 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 eben­ falls 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 1 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 pairs of rakes 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 extend flat if over the entire width of the housing 4, which is adapted to the fleece width.

Die in Fig. l angegebene Anzahl und die Neigung der Rechen stellt lediglich ein Ausführungsbeispiel dar. Es können entsprechend dem zu vergleichmäßigenden 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 items 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. l 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. 1, two spreader rollers 9 are arranged below the last cascade. These serve to change and evenly brake the evenly distributed material in its direction of fall and / or to achieve a simple separation of the chip material if a particle board or an OSB plate 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. l 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 l0 Streuwalzen 9 besitzt.In the case of the production of a chipboard from several layers, such dissolving devices as are described in FIG. 1 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 exit 10 has spreader rollers 9.

In Fig. l ist auch an einem Rechen des Rechenpaares 7 eine Aufnahmevorrichtung ll 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. l vor dem in Richtung des sich auf einer Un­ terlage aufbauenden Vlieses am weitesten stromabliegen­den Rechens stellt nur ein Ausführungsbeispiel dar. Die Aufnahmevorrichtung ll 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. 1 before in the direction of on a Un The supporting device 11 can also be located behind the rake which is the most upstream in the direction of the nonwoven which is built up on a support (in this case, the left rake of the computing pair 8).

Unter dem sich über die gesamte Streubreite erstrecken­den Gehäuse 4 ist eine Vliesaufnahmevorrichtung l2 dar­gestellt. Dabei kann die Vliesaufnahmevorrichtung l2 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 l2 bewegt sich in Richtung eines Pfeiles l3, so daß am linken Ende des Gehäuses 4 die endgültige Vlieshöhe l4 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 l2 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 l2 moves in the direction of an arrow l3, so that the final fleece height l4 for the fleece formed under this housing is reached at the left end of the housing 4.

Ein Lichtstrahl l5, der ebenfalls über die gesamte Breite des Vlieses l6 auf die Vliesoberfläche proji­ziert wird, erzeugt in einer Videokamera l7 ein Bild über die Vlieshöhe l4. Dieses so erzeugte Bild wird einem Rechner l8 zugeführt. Stimmt die über die Vlies­breite aufgenommene Vlieshöhe l4 mit einer vorgegebenen Vlieshöhe überein, wird kein Steuerbefehl l9 an einen Verstellmechanismus 20 (vgl. Fig. 3) in der Aufnahme­vorrichtung ll weitergegeben. Durch einen an den Rech­ner l8 angeschlossenen ersten Monitor 2l 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 l5, which is likewise projected onto the fleece surface over the entire width of the fleece l6, generates an image of the fleece height l4 in a video camera l7. This image generated in this way is fed to a computer 18. If the fleece height l4 picked up over the fleece width corresponds to a predetermined fleece height, no control command l9 is passed on to an adjustment mechanism 20 (cf. FIG. 3) in the pick-up device 11. The course of the fleece height over the width of a scattered fleece is represented by a first monitor 2l connected to the computer l8, 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 l5 erfindungsgemäß eine Vielzahl von Lichtstrahlen l5 von einer festste­ henden Lichtquelle 23 ausgesandt bzw. auf die Vlies­oberfläche projiziert, so können bei feststehender Vi­deokamera l7 Vliesoberflächen aufgenommen werden, die sich in ihrer Höhe wesentlich voneinander unterschei­den, ohne daß dadurch die Streugenauigkeit vermindert wird.Instead of a light beam l5, according to the invention a plurality of light beams l5 from a fixed one If the light source 23 is emitted or projected onto the nonwoven surface, then with a fixed video camera l7 nonwoven surfaces can be recorded which differ significantly in height without the scattering accuracy being reduced thereby.

Das in das Gehäuse 4 gemäß Fig. 2 über eine rechenar­tige Aufteilvorrichtung l 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 ll, 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 1 is divided 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-hand 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 11, 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 to add additional cascade levels at any time depending on the required accuracy.

Entsprechend den Steuerbefehlen l9 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 ll 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 they open too much occurring quantity of bulk material discharged from the supply, not shown, can flow into the receiving device 11.

In der Aufnahmevorrichtung ll 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 ll in ihrem unteren Teil eine Über­fallkante 3l, 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 11, 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 11 has an overflow edge 3l in its lower part, the excess material 30 that has been poured over will 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. Verfahren zum Streuen eines Spänevlieses, aus einem Vorrat in einer der Vliesbreite entsprechenden Breite auf eine sich unter dem Vorrat hindurchbe­wegende Unterlage (l2) entsprechend einer im Vlies (l6) vorgegebenen Vlieshöhenverteilung (l4) quer zur Vliesrichtung, dadurch gekennzeichnet, daß nach einem Auftrennen des Spänestroms (l, 2) nach dem Vorrat in und entgegen der Bewegungsrichtung der Unterlage (l2) die aufgetrennten Stromteile kaskadenförmig durch Richtungsänderungen der ein­zelnen Partikel erneut vermischt und über die Streubreite im Vlies (l6) auf einer bestimmten Vlieslänge gleichmäßig abgelegt werden.1. A method for scattering a chip fleece, from a supply in a width corresponding to the fleece width onto a base (l2) moving under the supply corresponding to a fleece height distribution (l4) predetermined in the fleece (l6), transverse to the fleece direction, characterized in that after a Separating the chip flow (l, 2) after the supply in and against the direction of movement of the base (l2), the separated current parts are cascaded again by changing the direction of the individual particles and are evenly deposited over the spread in the fleece (l6) over a certain length of fleece. 2. Vorrichtung zum Streuen eines Spänevlieses (l6) aus einem Vorrat in einer der Vliesbreite entsprechen­den Breite auf eine sich unter dem Vorrat hin­durchbewegten Unterlage (l2) entsprechend einer im Vlies vorgegebenen Vlieshöhenverteilung (l4) quer zur Vliesrichtung mit einer zwischen Vorrat und Vliesablage (l2) angeordneten rechenartigen Auf­teilvorrichtung (l) und einer Verteilschurre (3), dadurch gekennzeichnet, daß unterhalb hinter der Verteilschurre (3) mindestens ein Paar, sich nicht durchdringender Rechen (5) zueinander geneigt an­geordnet sind, daß stromab hinter und unter jedem Rechen des Rechenpaares (5) ein weiteres zu ein­ander geneigtes, sich nicht durchdringendes Re­chenpaar (6, 7) als nächste Kaskade angeordnet ist.2.Device for spreading a chip fleece (l6) from a supply in a width corresponding to the fleece width onto a support (l2) moving under the supply according to a fleece height distribution (l4) specified in the fleece transversely to the fleece direction with a between the supply and fleece deposit (l2 ) arranged rake-like dividing device (l) and a distribution chute (3), characterized in that at least one pair of non-penetrating rakes (5) are arranged inclined to one another below behind the distribution chute (3), that downstream behind and under each rake of the pair of rakes (5) another mutually inclined, non-penetrating computing pair (6, 7) is arranged as the next cascade. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeich­net, daß im Bereich des Endes der letzten Kaskade hinter oder vor dem in Richtung des sich auf einer Unterlage aufbauenden Vlieses (Vliesrichtung) am weitesten stromauf- oder stromabliegenden Rechen eine, sich über die Streubreite erstreckende, mit verschließbaren Öffnungen versehene, ummantelte Aufnahmevorrichtung (ll) vorgesehen ist.3. Apparatus according to claim 2, characterized in that in the region of the end of the last cascade behind or in front of in the direction of the nonwoven building up on a base (fleece direction) on furthest upstream or downstream rake, a covered receiving device (11) is provided which extends over the spreading width and is provided with closable openings. 4. Vorrichtung nach Anspruch 3, dadurch gekennzeich­net, daß in der Aufnahmevorrichtung (ll) eine För­dervorrichtung (29) vorgesehen ist.4. The device according to claim 3, characterized in that a conveyor device (29) is provided in the receiving device (ll). 5. Vorrichtung nach Anspruch 2 oder 3, dadurch gekenn­zeichnet, daß unter der letzten Kaskade mindestens eine Streuwalze (9) vorgesehen ist.5. Apparatus according to claim 2 or 3, characterized in that at least one spreader roller (9) is provided under the last cascade. 6. Vorrichtung nach einem der vorhergehenden Ansprü­che, dadurch gekennzeichnet, daß die Aufnahmevor­richtung (ll) mit durch Stegen voneinander ge­trennten, verschließbaren Öffnungen versehen ist und daß diese mit dem mit ihr zusammenwirkenden Rechen gegeneinander quer zur Vliesrichtung ver­schiebbar sind.6. Device according to one of the preceding claims, characterized in that the receiving device (II) is provided with closable openings which are separated from one another by webs, and in that they can be displaced with respect to one another transversely to the fleece direction with the rake interacting with them. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeich­net, daß die Stege als Rechen ausgebildet sind.7. The device according to claim 6, characterized in that the webs are designed as rakes. 8. Vorrichtung nach einem der Ansprüche 2 bis 4, da­durch gekennzeichnet, daß zwei übereinander und über der Aufnahmevorrichtung (ll) vorgesehene Rechen quer zur Vliesrichtung gegeneinander ver­schiebbar sind.8. Device according to one of claims 2 to 4, characterized in that two rakes provided one above the other and above the receiving device (ll) can be displaced relative to one another transversely to the nonwoven direction. 9. Vorrichtung nach einem der vorhergehenden Ansprü­che, dadurch gekennzeichnet, daß ein von einer Lichtquelle (23) ausgehender Lichtstrahl (l5) das Spänevlies (l6) über dessen Breite quer zur Fort­schrittsrichtung (l3) trifft, daß eine Videokamera (l7) diesen Lichtstrich aufnimmt und diese Infor­mation an einen Rechner (l8) weitergibt, indem Steuerinformationen (l9) für die Aufnahmevorrich­tung (ll) abgeleitet werden, daß die über einer Plattenlänge entsprechende Vlieslänge aufgenomme­nen Lichtstriche über die Breite des Vlieses im Rechner (l8) gespeichert und anschließend die Plattenoberfläche in Höhenschichten auf einem Monitor (2l bzw. 22) dargestellt wird.9. Device according to one of the preceding claims, characterized in that a light beam (l5) emanating from a light source (23) hits the chip fleece (l6) across its width transversely to the direction of progress (l3), that a video camera (l7) records this light line and forwards this information to a computer (18) by Control information (l9) for the receiving device (ll) are derived such that the light lines recorded over a length of the fleece corresponding to the width of the fleece are stored in the computer (l8) and then the plate surface is displayed in height layers on a monitor (2l 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
EP87107526A EP0292581B1 (en) 1987-05-23 1987-05-23 Fibre felt strewing method
AT87107526T ATE58325T1 (en) 1987-05-23 1987-05-23 METHOD OF SPREADING A CHIP MAT.
US07/191,041 US4931243A (en) 1987-05-23 1988-05-06 Process and apparatus for spreading a chip web
CA000566410A CA1300552C (en) 1987-05-23 1988-05-10 Process and apparatus for spreading a chip web
FI882166A FI85959C (en) 1987-05-23 1988-05-10 Procedure for spreading a chipboard

Applications Claiming Priority (1)

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

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

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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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EP2531332A1 (en) * 2010-02-05 2012-12-12 Dieffenbacher GmbH Maschinen- und Anlagenbau Methods and installation for producing a particle mat from at least one spread layer and a particle mat to be pressed in a press during the production of wood particle boards
EP2531331B1 (en) * 2010-02-05 2018-07-11 Dieffenbacher GmbH Maschinen- und Anlagenbau Methods and installation for producing a particle mat from at least one spread layer
CN109843568A (en) * 2016-10-06 2019-06-04 瑞士卢森技术股份公司 Composite wood boards press device and the method for monitoring composite wood boards press device
DE202018102823U1 (en) 2018-05-22 2019-08-26 Dieffenbacher GmbH Maschinen- und Anlagenbau Device for scattering a fleece on a forming belt
EP3572197A1 (en) 2018-05-22 2019-11-27 Dieffenbacher Gmbh Maschinen- Und Anlagenbau Device and method for dispersing a fleece on a forming web
CN110509392A (en) * 2018-05-22 2019-11-29 迪芬巴赫机械工程有限公司 For taking the device and method for spreading material felt in molding

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FI85959B (en) 1992-03-13
CA1300552C (en) 1992-05-12
FI85959C (en) 1992-06-25
DE3766247D1 (en) 1990-12-20
FI882166A (en) 1988-11-24
EP0292581B1 (en) 1990-11-14
US4931243A (en) 1990-06-05
FI882166A0 (en) 1988-05-10
ATE58325T1 (en) 1990-11-15

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