EP1342543B1 - Dispersing station for dispersing glued chips - Google Patents

Dispersing station for dispersing glued chips Download PDF

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Publication number
EP1342543B1
EP1342543B1 EP20030003033 EP03003033A EP1342543B1 EP 1342543 B1 EP1342543 B1 EP 1342543B1 EP 20030003033 EP20030003033 EP 20030003033 EP 03003033 A EP03003033 A EP 03003033A EP 1342543 B1 EP1342543 B1 EP 1342543B1
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EP
European Patent Office
Prior art keywords
grooves
spreading
spreader
rolls
scattering
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 - Fee Related
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EP20030003033
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German (de)
French (fr)
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EP1342543A2 (en
EP1342543A3 (en
Inventor
Matthias Graf
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Maschinenfabrik J Dieffenbacher GmbH and Co
Dieffenbacher GmbH Maschinen und Anlagenbau
Original Assignee
Maschinenfabrik J Dieffenbacher GmbH and Co
Dieffenbacher GmbH Maschinen und Anlagenbau
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Publication of EP1342543A2 publication Critical patent/EP1342543A2/en
Publication of EP1342543A3 publication Critical patent/EP1342543A3/en
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Publication of EP1342543B1 publication Critical patent/EP1342543B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres

Definitions

  • the invention relates to a scattering station for spreading glued spreading materials, in particular wood chips, in the course of the production of wood-based panels according to the preamble of claim 1 and 2.
  • the pad is usually a continuously moving forming belt, which supplies the chip web to a press.
  • Chipboard is today almost exclusively produced as a three-layer board for use in the furniture industry and as structural panels.
  • the lower cover layer, the middle layer and finally the upper cover layer are first sprinkled onto the forming belt.
  • three or four scattering stations are usually used, whereby two scattering stations for the cover layer and one or two scattering stations for the middle layer can be provided.
  • cover layers are therefore made from very fine chips, wherein the fine chip material is scattered over a scattering process such that a desired separation takes place, so that the finer material from the cover layer fraction at the Plate surface and the coarser chip material is scattered lying to the middle layer.
  • the middle layer is made from a mixture of different coarse chips with a residual content of fine chips, which must be spread as homogeneously as possible in order to achieve high transverse tensile strengths.
  • a scattering station with scattering head arrangement for scattering chip material is from the US-A-5,887,515 known.
  • the spreading head assembly consists of a plurality of scattering rollers, which are arranged parallel to each other and form a roller bed. All scattering rollers rotate in the same direction and are provided with a surface structure which is formed by zigzag offset, introduced separately, channel-shaped depressions formed in the lateral surface of the scattering rollers. Adjacent spreader rolls close together. At the discharge end of the roller bed a return screw is arranged, which serves to promote foreign matter from the scattering out.
  • This scattering head arrangement can lead to uneven scattering, since the gap which is decisive for the separation is not constant during rotation of two adjacent scattering rolls but varies.
  • the Separierspalt can be approximately zero, when facing each of the mantle surfaces adjacent spreader rolls, it can be once the groove depth of the channel-shaped recess when the mantle surface of a roller with the channel-shaped recess facing the opposite scattering roller, and it can twice the groove depth, when the channel-shaped recesses face adjacent spreader rolls.
  • a screening device for the paper industry which has rolls with circumferential grooves.
  • the groove course of adjacent rollers is always opposite, and the groove lands and the grooves of adjacent rollers are always arranged to be engaged.
  • the circumferential grooves of the scattering rollers always have an angle to a plane perpendicular to the longitudinal axis of the screen rollers level. Disadvantageous, are the complex construction of the rollers and the control, since Nutenstege and grooves of adjacent rollers must always be kept in engagement.
  • the EP-A-0 442 222 is a screening device for the paper industry is known, in which the screening rollers may be provided with spiral circumferential grooves, which are not self-contained and are provided in the adjacent screen rollers with opposite grooves, grooved lands and grooves of adjacent rollers are always engaged.
  • a screening device in which similar shaped rollers are arranged in parallel and are driven in the opposite direction.
  • the rollers are provided with circumferential grooves, which have a sinusoidal course and in which the webs between the grooves face each other; the outer diameter of the two rollers is elliptical.
  • the screening device is intended for the sorting of agricultural goods.
  • the GB-A-2 138 708 is also a screening device for agricultural goods known in the two parallel rollers are driven in opposite directions.
  • the rollers carry helical grooves, adjacent rollers always have an oppositely directed groove course.
  • the rollers are arranged so that the webs are always spaced between the grooves of the two rollers.
  • a disadvantage is the complex construction of the rollers or rollers.
  • a screening device for separating and classifying chips in which a plurality of rollers are arranged side by side; adjacent rollers have different surface structures and are driven in opposite directions.
  • the rollers are always arranged at a distance from each other and thereby formed such that the lateral surfaces are provided with tapered projections, which are separated by tapering valleys from each other.
  • the rollers are arranged such that between the outer ends of the projections of adjacent rollers a decisive gap for the separation is formed.
  • a roller spreading machine which can be used as a cover layer spreading machine or as a middle layer spreading machine.
  • the roller spreading machine consists of a plurality of axially parallel arranged with the same direction rotating rollers.
  • the rollers are provided with a plurality of axially spaced annular grooves.
  • the ring grooves are separated by ring lands.
  • Adjacent rollers are arranged so that annular webs of a roller facing the annular grooves of the adjacent roller, so that chip by-pass openings are formed.
  • Ring grooves and ring lands are each in perpendicular to the roll axis planes. The surface of the annular grooves and ring lands is each serrated.
  • roller or roller arrangement In the known roller or roller arrangement is always disadvantageous that it can come in the formation of very long rolls / rollers during rotation due to instabilities to a collision of projections of adjacent rollers / rollers, resulting in damage to the roll surfaces.
  • the invention has the object of providing a scattering station for spreading glued spreading materials, in particular chips, so that both an ideal scattering, as well as a separate scattering can be achieved over the cross-section uniform scattering result and wherein the scattering particular for sprinkling of very wide chipboard is suitable.
  • the spreading material that fits through the spreading gap, when the rollers rotate over a certain cross-sectional area distributed oscillating (wobble).
  • the scattered grit is distributed evenly over a wider area and over the entire spread. This also contributes to the fact that the groove depth of adjacent scattering rollers and thus the decisive for the separation spreading gap is always the same.
  • a particular advantage of the embodiment of the scattering station according to the invention lies in the fact that upon rotation of the long scattering rollers adjacent scattering rollers can stabilize each other, as between the grooves, the roll surface is present as a smooth surface and the roll surface of adjacent, scattering rolls always face each other during rotation or are closely adjacent and therefore can support each other.
  • the grooves are formed as closed circumferential grooves, spreading goods, such as wood chips, which do not fit through the gap are transported on the surface of the rollers. Due to the special design of the grooves, there is no transport effect of the spreading material that does not fit through the gap in the transverse direction, but due to the rotation of the rollers, the spreading material that does not fit through the gap is transported further in the direction of the discharge end; There it can be removed according to a further development of the invention by means of a screw conveyor coarse catcher from the scattering process.
  • Fig. 1 schematically is a scattering station 1 with a dosing bunker 2, which has a Austragswalzenan Aunt 3, a scattering head assembly 4 and a forming belt 5 shown.
  • the scattering station 1 is used for the production of nonwovens of lignocellulose and / or cellulose-containing particles of different sizes, such as fibers, chips and the like.
  • the spreading head assembly 4 consists of a plurality of scattering rolls 6 arranged parallel to each other, with adjacent spreading rolls close to each other and a roll bed being formed. All scattering rollers 6 of the spreading head assembly 4 rotate in the same direction. This is shown by the arrows 7.
  • the spreading head assembly 4 has a task end A1, and a discharge end A2 on the opposite side of the roller bed.
  • the wood chips are arranged to a nonwoven 8 on a below the scattering head assembly 4 continuously circulating forming belt 5 scattered.
  • the conveying direction of the forming belt 5 is represented by the arrow 9.
  • the spreader rollers 6 of the roller bed are provided with a surface structure. Further details are in the FIGS. 2a, 2b , 2c can be seen. Due to the introduced into the scattering rollers 6 surface structures, which are formed as circumferential grooves, scattering gaps are formed between adjacent scattering rollers which close to each other.
  • the depth of the grooves introduced into the spreading rolls between adjacent spreading rolls 6 increases from the feeding end A1 to the discharge end A2. This is illustrated in the figure for clarification by an increasing distance from A1 to A2 between the scattering rollers 6. Furthermore, it is shown schematically that thus scattered at the end of the task very fine spreading material through the spreading gap and in the direction of the discharge end towards ever-increasing spreading material is scattered through the spreading gaps.
  • a coarse collecting device 10 is provided, through which oversized scattering particles and foreign bodies can be collected and transported away by means of a conveying screw.
  • FIGS. 2a, 2b and 2c scattering rollers 6 shown in detail view are each provided with end journals.
  • the lateral surface of the scattering rollers 6 are distributed uniformly spaced grooves 11 over the entire length of the scattering rollers 6 introduced. Every groove 11 is how it looks Fig. 2a, 2b can be seen as a self-contained, circumferential groove 11 is formed.
  • a plurality of such grooves 11 are introduced into the mantle surface, each extending parallel to each other.
  • the grooves 11 are rounded in this embodiment, the bottom of the groove 14 semicircular. However, it is self-evident that grooves with a different cross-section can be introduced into the scattering rollers 6
  • FIG. 3a is a further embodiment of introduced into the scattering rollers 6 grooves 11 'shown.
  • These grooves 11 ' are also formed as a closed around the lateral surface circumferential grooves 11', which are parallel to each other.
  • the grooves 11 ' have a zigzag course.
  • grooves 11 ' are formed around the lateral surface of the scattering rollers 6 as closed grooves 11,11', and that the grooves 11,11 'at least partially with respect to a plane perpendicular to the longitudinal axis 13 plane 12 obliquely Asked areas exhibit.
  • Neighboring spreader rollers 6 are driven and coupled so that they run away synchronous to each other and the grooves 11,11 'of the adjacent spreader rollers 6 always face each other during rotation and do not move against each other. Thus, it is ensured that the groove depth is twice as constant as the scattering gap that governs the separation Scouring gap over the entire length between two adjacent scattering rollers 6 receives. Due to the constant groove depth of adjacent scattering rollers 6 a more uniform scattering result over the cross-sectional width (length of the scattering gap) is achieved.
  • the uniform groove depth of adjacent scattering rollers 6 is also achieved when the spreading head assembly 4 is formed such that in each case provided with a surface structure scattering roller 6 with a smooth / unstructured scattering roller 6 alternates.
  • the decisive for the separation Streuspalt is formed by once the groove depth.
  • the grooves 11,11 ' are formed as closed circumferential grooves 11,11', larger chips that do not fit through the gap transported on the surface of the scattering rollers 6 are transported. It is due to the special design of the grooves 11,11 'no transport effect of not suitable by the gap material to be spread in the transverse direction. Not through the gap proper spreading material is conveyed by rotation of the scattering rollers 6, as described above, further toward the discharge end A2 and is then removed from the spreading operation by means of the screw conveyor of the coarse receiving device 10.
  • the spreader rollers 6 of the spreading head assembly 4 must be made correspondingly long.
  • adjacent spreader rollers 6 can mutually stabilize because between the grooves 11,11 'the roller surface is present as a smooth surface and the roller surface of adjacent spreader rollers 6 always face each other during rotation and are arranged adjacent to each other and therefore mutually can support.
  • FIG. 4 is a further embodiment of the scattering station according to the invention FIG. 1 shown.
  • the spreading head assembly 4 via a displacement unit 15 in the longitudinal direction. slidably disposed in the conveying direction of the forming belt 5.
  • FIG. 4 an arrangement is shown in which a part of the scattering rollers 6 are below the bottom belt of the dosing bunker 2 and thus no substance flow is fed from the discharge of Dosierbunkers 2 on this section A3.
  • the task end A1 'thus shifts to the scattering rollers 6 located below the discharge of the metering bunker.
  • the scattering rollers 6 of the section A3 are hidden, so that the scattered cover layer fraction or the subsequently finished wood-based panel has a coarser surface finish.
  • the scattering station according to the invention according to the embodiments described above can also be used for scattering middle layers.
  • the scattering materials must be scattered as homogeneously as possible.
  • all scattering rollers 6 of the spreading material arrangement are formed with the same groove depths, so that the spreading gap between adjacent spreading rollers 6 is constant from the feed end to the discharge end.

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

Description

Die Erfindung betrifft eine Streustation zum Streuen von beleimten Streugütern, insbesondere Holzspänen, im Zuge der Herstellung von Holzwerkstoffplatten gemäß dem Oberbegriff des Anspruchs 1 und 2.The invention relates to a scattering station for spreading glued spreading materials, in particular wood chips, in the course of the production of wood-based panels according to the preamble of claim 1 and 2.

Bei der Herstellung von Werkstoffplatten, aus streufähigen oder rieselfähigen Materialien wie beispielsweise bei der Herstellung von Spanplatten wird ein Gemisch aus Holzspänen oder faserigen Stoffen und Bindemitteln zu einem Vlies auf eine Unterlage gestreut. Dazu ist die Unterlage meist ein kontinuierlich bewegtes Formband, das das Spänevlies einer Presse zuführt.In the manufacture of material plates, of spreadable or free-flowing materials such as in the manufacture of particleboard, a mixture of wood shavings or fibrous materials and binders is scattered to a nonwoven on a substrate. For this purpose, the pad is usually a continuously moving forming belt, which supplies the chip web to a press.

Spanplatten werden für die Anwendung in der Möbelindustrie und als Bauplatten heute nahezu ausschließlich als Dreischichtplatten hergestellt. Für den dreischichtigen Aufbau wird auf das Formband daher zuerst die untere Deckschicht, darauffolgend die Mittelschicht und letztlich die obere Deckschicht aufgestreut. Zur Herstellung einer dreischichtigen Spanplätte werden üblicherweise drei oder vier Streustationen eingesetzt, wobei zwei Streustationen für die Deckschicht und eine oder zwei Streustationen für die Mittelschicht vorgesehen sein können.Chipboard is today almost exclusively produced as a three-layer board for use in the furniture industry and as structural panels. For the three-layer construction, the lower cover layer, the middle layer and finally the upper cover layer are first sprinkled onto the forming belt. For producing a three-layer chipboard, three or four scattering stations are usually used, whereby two scattering stations for the cover layer and one or two scattering stations for the middle layer can be provided.

Da die Oberfläche, insbesondere von Möbelplatten, eine Beschichtung oder Lackierung erhält, muss diese sehr fein ausgebildet sein und darf keine Poren aufweisen. Die Deckschichten werden daher aus sehr feinen Spänen hergestellt, wobei das feine Spanmaterial über einen Streuvorgang derart gestreut wird, dass eine gewünschte Separation erfolgt, so dass das feinere Material aus der Deckschichtfraktion an der Plattenoberfläche und das gröbere Spanmaterial zur Mittelschicht hin liegend gestreut wird.Since the surface, in particular of furniture panels, receives a coating or paint, it must be very fine and must have no pores. The cover layers are therefore made from very fine chips, wherein the fine chip material is scattered over a scattering process such that a desired separation takes place, so that the finer material from the cover layer fraction at the Plate surface and the coarser chip material is scattered lying to the middle layer.

Die Mittelschicht wird aus einem Gemisch aus unterschiedlich groben Spänen mit einem Restanteil an feinen Spänen hergestellt, das zur Erzielung von hohen Querzugfestigkeiten möglichst homogen gestreut werden muss.The middle layer is made from a mixture of different coarse chips with a residual content of fine chips, which must be spread as homogeneously as possible in order to achieve high transverse tensile strengths.

Bei dem Streuvorgang der Deckschichtfraktion und auch der Mittelschichtfraktion muss vermieden werden, dass Streugutverdichtungen, Leimknoten oder andersartige Fremdkörper in das gestreute Spänevlies gelangen, da es ansonsten zu Beschädigungen der Stahlbandpresse, d.h. einer Beschädigung der Stahlbänder der Presse, kommen kann.In the scattering process of the top layer fraction and the middle layer fraction must be avoided that Streugutverdichtungen, glue knots or other foreign matter in the scattered chip fleece, otherwise it would damage the steel belt press, i. Damage to the steel straps of the press, can come.

Eine Streustation mit Streukopfanordnung zum Streuen von Spanmaterial ist aus der US-A-5 887 515 bekannt. Die Streukopfanordnung besteht dabei aus einer Vielzahl von Streuwalzen, die parallel zueinander angeordnet sind und ein Rollenbett bilden. Alle Streuwalzen rotieren in gleicher Richtung und sind mit einer Oberflächenstruktur versehen, die durch zickzackförmig versetzt angeordnete, getrennt voneinander eingebrachte, kanalförmige Vertiefungen in der Mantelfläche der Streuwalzen gebildet ist. Benachbarte Streuwalzen schließen dicht aneinander an. Am Austragsende des Walzenbettes ist eine Rückführschnecke angeordnet, die dazu dient, Fremdkörper aus dem Streuvorgang heraus zu fördern. Durch diese Streukopfanordnung kann es zu einer ungleichmäßigen Streuung kommen, da der für die Separierung maßgebende Spalt bei Rotation von zwei benachbarten Streuwalzen nicht gleichbleibend ist, sondern variiert. Der Separierspalt kann annähernd Null sein, wenn sich jeweils die Manteloberflächen benachbarter Streuwalzen gegenüberstehen, er kann einmal die Nuttiefe der kanalförmigen Vertiefung betragen, wenn sich die Manteloberfläche der einen Walze mit der kanalförmigen Vertiefung der gegenüberliegenden Streuwalze gegenüberstehen, und er kann zweimal die Nuttiefe betragen, wenn sich die kanalförmigen Vertiefungen benachbarte Streuwalzen gegenüberstehen.A scattering station with scattering head arrangement for scattering chip material is from the US-A-5,887,515 known. The spreading head assembly consists of a plurality of scattering rollers, which are arranged parallel to each other and form a roller bed. All scattering rollers rotate in the same direction and are provided with a surface structure which is formed by zigzag offset, introduced separately, channel-shaped depressions formed in the lateral surface of the scattering rollers. Adjacent spreader rolls close together. At the discharge end of the roller bed a return screw is arranged, which serves to promote foreign matter from the scattering out. This scattering head arrangement can lead to uneven scattering, since the gap which is decisive for the separation is not constant during rotation of two adjacent scattering rolls but varies. The Separierspalt can be approximately zero, when facing each of the mantle surfaces adjacent spreader rolls, it can be once the groove depth of the channel-shaped recess when the mantle surface of a roller with the channel-shaped recess facing the opposite scattering roller, and it can twice the groove depth, when the channel-shaped recesses face adjacent spreader rolls.

In der GB-A-856 027 ist eine Siebeinrichtung für die Papierindustrie beschrieben, welche Walzen mit umlaufenden Nuten aufweist. Der Nutenverlauf benachbarter Walzen ist immer entgegengesetzt, und die Nutenstege und die Nuten benachbarter Walzen sind immer derart angeordnet, dass sie im Eingriff sind. Die umlaufenden Nuten der Streuwalzen weisen immer einen Winkel zu einer senkrecht auf die Längsachse der Siebwalzen stehenden Ebene auf. Nachteilig, sind die aufwendige Konstruktion der Walzen und die Steuerung, da Nutenstege und Nuten benachbarter Walzen immer in Eingriff gehalten werden müssen.In the GB-A-856,027 is described a screening device for the paper industry, which has rolls with circumferential grooves. The groove course of adjacent rollers is always opposite, and the groove lands and the grooves of adjacent rollers are always arranged to be engaged. The circumferential grooves of the scattering rollers always have an angle to a plane perpendicular to the longitudinal axis of the screen rollers level. Disadvantageous, are the complex construction of the rollers and the control, since Nutenstege and grooves of adjacent rollers must always be kept in engagement.

Durch die EP-A-0 442 222 ist eine Siebeinrichtung für die Papierindustrie bekannt, bei der die Siebrollen mit spiralförmig umlaufenden Nuten versehen sein können, die nicht in sich geschlossen sind und bei der benachbarte Siebwalzen mit entgegengesetzt verlaufenden Nuten versehen sind, Nutenstege und Nuten benachbarter Walzen sind immer in Eingriff.By the EP-A-0 442 222 is a screening device for the paper industry is known, in which the screening rollers may be provided with spiral circumferential grooves, which are not self-contained and are provided in the adjacent screen rollers with opposite grooves, grooved lands and grooves of adjacent rollers are always engaged.

In der US-A-4 953 712 ist eine Siebeinrichtung beschrieben, bei der gleichartig geformte Rollen parallel angeordnet sind und in entgegengesetzter Richtung angetrieben werden. Die Rollen sind mit umlaufenden Nuten versehen, die einen sinusförmigen Verlauf aufweisen und bei denen sich die Stege zwischen den Nuten jeweils gegenüberstehen; der Außendurchmesser der beiden Rollen ist ellipsenförmig. Die Siebvorrichtung ist für das Sortieren von landwirtschaftlichen Gütern vorgesehen. Durch die GB-A-2 138 708 ist ebenfalls eine Siebeinrichtung für landwirtschaftliche Güter bekannt, bei der zwei parallele Rollen entgegengesetzt angetrieben werden. Die Rollen tragen schraubenförmig verlaufende Nuten, wobei benachbarte Rollen immer einen entgegengesetzt gerichteten Nutenverlauf aufweisen. Die Rollen sind so angeordnet, dass die Stege zwischen den Nuten der beiden Rollen immer beabstandet sind. Nachteilig ist die aufwendige Konstruktion der Walzen bzw. der Rollen.In the US-A-4 953 712 a screening device is described in which similar shaped rollers are arranged in parallel and are driven in the opposite direction. The rollers are provided with circumferential grooves, which have a sinusoidal course and in which the webs between the grooves face each other; the outer diameter of the two rollers is elliptical. The screening device is intended for the sorting of agricultural goods. By the GB-A-2 138 708 is also a screening device for agricultural goods known in the two parallel rollers are driven in opposite directions. The rollers carry helical grooves, adjacent rollers always have an oppositely directed groove course. The rollers are arranged so that the webs are always spaced between the grooves of the two rollers. A disadvantage is the complex construction of the rollers or rollers.

In der US-A-5 012 933 ist eine Siebeinrichtung zur Trennung und Klassifiziexen von Spänen beschrieben, bei der eine Vielzahl von Rollen nebeneinander angeordnet sind; benachbarte Rollen weisen unterschiedliche Oberflächenstrukturen auf und werden entgegengesetzt angetrieben. Die Rollen sind immer mit einem Abstand zueinander angeordnet und dabei derart ausgebildet, dass die Manteloberflächen mit sich verjüngenden Vorsprüngen versehen sind, die durch sich verjüngende Täler voneinander getrennt sind. Die Walzen sind dabei derart angeordnet, dass zwischen den äußeren Enden der Vorsprünge benachbarter Walzen ein für die Separierung maßgebender Spalt gebildet wird.In the US-A-5 012 933 a screening device for separating and classifying chips is described in which a plurality of rollers are arranged side by side; adjacent rollers have different surface structures and are driven in opposite directions. The rollers are always arranged at a distance from each other and thereby formed such that the lateral surfaces are provided with tapered projections, which are separated by tapering valleys from each other. The rollers are arranged such that between the outer ends of the projections of adjacent rollers a decisive gap for the separation is formed.

Aus der US-B1-6 257 414 ist eine Walzenstreumaschine bekannt, die als Deckschicht-Streumaschine oder als Mittelschicht-Streumaschine eingesetzt werden kann. Die Walzenstreumaschine besteht aus einer Vielzahl von achsparallel angeordneten mit gleicher Drehrichtung umlaufenden Walzen. Die Walzen sind mit einer Vielzahl axial beabstandet angeordneter Ringnuten versehen. Die Ringnuten sind durch Ringstege getrennt. Benachbarte Walzen sind dabei so angeordnet, dass sich Ringstege der einen Walze den Ringnuten der benachbarten Walze gegenüberstehen, so dass Spänedurchfallöffnungen gebildet werden. Ringnuten und Ringstege liegen jeweils in senkrecht auf der Walzenachse stehenden Ebenen. Die Oberfläche der Ringnuten und Ringstege ist jeweils gezahnt ausgeführt.From the US-B1-6,257,414 For example, a roller spreading machine is known which can be used as a cover layer spreading machine or as a middle layer spreading machine. The roller spreading machine consists of a plurality of axially parallel arranged with the same direction rotating rollers. The rollers are provided with a plurality of axially spaced annular grooves. The ring grooves are separated by ring lands. Adjacent rollers are arranged so that annular webs of a roller facing the annular grooves of the adjacent roller, so that chip by-pass openings are formed. Ring grooves and ring lands are each in perpendicular to the roll axis planes. The surface of the annular grooves and ring lands is each serrated.

Bei den bekannten Walzen- bzw. Rollenanordnung ist immer nachteilig, dass es bei der Ausbildung von sehr langen Walzen/Rollen bei der Rotation aufgrund von Instabilitäten zu einem Aufeinanderschlagen von Vorsprüngen benachbarter Walzen/Rollen kommen kann, was zur Beschädigung der Walzenoberflächen führt.In the known roller or roller arrangement is always disadvantageous that it can come in the formation of very long rolls / rollers during rotation due to instabilities to a collision of projections of adjacent rollers / rollers, resulting in damage to the roll surfaces.

Ausgehen vom nächstliegenden Stand der Technik nach der US-A-5 887 515 liegt der Erfindung die Aufgabe zugrunde, eine Streustation zum Streuen von beleimten Streugütern, insbesondere Spänen, derart weiterzubilden, dass sowohl eine ideale Streuung, als auch eine separierte Streuung mit über den Querschnitt gleichmäßigem Streuergebnis erzielt werden kann und wobei die Streustation insbesondere zum Streuen von sehr breiten Spänevliesen geeignet ist.Starting from the closest prior art after the US-A-5,887,515 The invention has the object of providing a scattering station for spreading glued spreading materials, in particular chips, so that both an ideal scattering, as well as a separate scattering can be achieved over the cross-section uniform scattering result and wherein the scattering particular for sprinkling of very wide chipboard is suitable.

Diese Aufgabe wird sowohl durch eine Streustation mit den Merkmalen im Anspruch 1 als auch im Anspruch 2 gelöst.This object is achieved both by a scattering station with the features in claim 1 and in claim 2.

Durch die erfindungsgemäße Ausgestaltung der Nuten, die schräg in die Manteloberfläche eingebracht sind bzw. zumindest abschnittsweise schräg gestellte Bereiche aufweisen, wird das Streugut, das durch den Streuspalt passt, bei Rotation der Walzen über einen bestimmten Querschnittsbereich oszillierend verteilt (Taumelbewegung). Hierdurch wird das gestreute Streugut auf einer breiteren Fläche und über die gesamte Streubreite gleichmäßig verteilt. Hierzu trägt auch bei, dass die Nuttiefe benachbarter Streuwalzen und somit der für die Separierung maßgebende Streuspalt immer gleichbleibend ist.Due to the inventive design of the grooves which are obliquely introduced into the mantle surface or at least partially have inclined areas, the spreading material that fits through the spreading gap, when the rollers rotate over a certain cross-sectional area distributed oscillating (wobble). As a result, the scattered grit is distributed evenly over a wider area and over the entire spread. This also contributes to the fact that the groove depth of adjacent scattering rollers and thus the decisive for the separation spreading gap is always the same.

Bei der Herstellung von sehr breiten Holzwerkstoffplatten müssen die Streuwalzen der Streukopfanordnung entsprechend lang ausgerührt sein. Ein besonderer Vorteil der erfindungsgemäßen Ausgestaltung der Streustation liegt nun darin, dass bei Rotation der langen Streuwalzen sich benachbarte Streuwalzen gegenseitig stabilisieren können, da zwischen den Nuten die Walzenoberfläche als glatte Oberfläche vorhanden ist und sich die Walzenoberfläche benachbarter, Streuwalzen bei Rotation immer gegenüberstehen bzw. dicht benachbart sind und sich daher gegenseitig abstützen können.In the production of very wide wood-based panels, the spreader rollers of the spreader assembly must be stirred accordingly long. A particular advantage of the embodiment of the scattering station according to the invention lies in the fact that upon rotation of the long scattering rollers adjacent scattering rollers can stabilize each other, as between the grooves, the roll surface is present as a smooth surface and the roll surface of adjacent, scattering rolls always face each other during rotation or are closely adjacent and therefore can support each other.

Da die Nuten als geschlossene umlaufende Nuten ausgebildet sind, werden Streugüter, beispielsweise Holzspäne, die nicht durch den Spalt passen auf der Oberfläche der Walzen weitertransportiert. Durch die besondere Ausbildung der Nuten erfolgt keine Transportwirkung des nicht durch den Spalt passenden Streugutes in Querrichtung, sondern durch die Rotation der Walzen wird das nicht durch den Spalt passende Streugut weiter in Richtung auf das Austragsende hin befördert; dort kann es gemäß einer weiterbildung der Erfindung mittels einer Förderschnecke einer Grobauffangeinrichtung aus dem Streuvorgang entfernt werden.Since the grooves are formed as closed circumferential grooves, spreading goods, such as wood chips, which do not fit through the gap are transported on the surface of the rollers. Due to the special design of the grooves, there is no transport effect of the spreading material that does not fit through the gap in the transverse direction, but due to the rotation of the rollers, the spreading material that does not fit through the gap is transported further in the direction of the discharge end; There it can be removed according to a further development of the invention by means of a screw conveyor coarse catcher from the scattering process.

Weitere vorteilhafte Ausführungsvarianten sind in den Unteransprüchen angegeben.Further advantageous embodiments are specified in the subclaims.

Die Erfindung wird anhand von Ausführungsbeispielen, die in den Zeichnungen dargestellt sind, näher erläutert.The invention will be explained in more detail with reference to exemplary embodiments which are illustrated in the drawings.

Es zeigt:

Fig. 1:
eine schematische Darstellung einer erfindungsgemäßen Streustation;
Fig. 2a:
eine Streuwalze der Streukopfanordnung in Seitenansicht;
Fig. 2b:
die Streuwalze nach Fig. 2a in Draufsicht;
Fig. 2c:
ein Detailausschnitt des in Fig. 2a mit y bezeichneten Streuwalzenabschnitts im Schnitt;
Fig. 3a:
eine weitere Ausführung einer Streuwalze in Seitenansicht;
Fig. 3b:
ein Detailausschnitt des in Fig. 3a mit x bezeichneten Streuwalzenabschnitts im Schnitt;
Fig. 4:
eine schematische Darstellung einer weiteren Ausführungsform einer erfindungsgemäßen Streustation.
It shows:
Fig. 1:
a schematic representation of a scattering station according to the invention;
Fig. 2a:
a spreader roll of the spreading head assembly in side view;
Fig. 2b:
the scattering roller after Fig. 2a in plan view;
Fig. 2c:
a detail of the in Fig. 2a sectioned with y scattering roller section;
Fig. 3a:
a further embodiment of a scattering roller in side view;
3b:
a detail of the in Fig. 3a sectioned with x scattering roller section;
4:
a schematic representation of another embodiment of a scattering station according to the invention.

In Fig. 1 ist schematisch eine Streustation 1 mit einem Dosierbunker 2, der eine Austragswalzenanordnung 3 aufweist, eine Streukopfanordnung 4 sowie ein Formband 5 dargestellt. Die Streustation 1 wird zur Herstellung von Vliesen aus lignozellulose und/oder zellulosehaltiger Teilchen unterschiedlicher Größe, wie Fasern, Späne und dergleichen eingesetzt.In Fig. 1 schematically is a scattering station 1 with a dosing bunker 2, which has a Austragswalzenanordnung 3, a scattering head assembly 4 and a forming belt 5 shown. The scattering station 1 is used for the production of nonwovens of lignocellulose and / or cellulose-containing particles of different sizes, such as fibers, chips and the like.

Die nachfolgende Beschreibung der Erfindung anhand der Figuren ist beispielhaft für die Herstellung von Holzwerkstoffplatten aus Spänen beschrieben.The following description of the invention with reference to the figures is described by way of example for the production of wood-based panels from chips.

Aus dem Dosierbunker 2 werden beleimte Holzspäne als Stoffstrom über die Austragswalzenanordnung 3 aus dem Dosierbunker 2 ausgetragen. Die aus dem Dosierbunker 2 ausgetragenen Holzspäne fallen auf das Aufgabeende A1 der Streukopfanordnung 4. Die Streukopfanordnung 4 besteht aus einer Vielzahl von Streuwalzen 6, die parallel zueinander angeordnet sind, wobei benachbarte Streuwalzen dicht aneinander anschließen und ein Rollenbett gebildet wird. Alle Streuwalzen 6 der Streukopfanordnung 4 rotieren in der gleichen Richtung. Dies ist durch die Pfeile 7 dargestellt. Die Streukopfanordnung 4 besitzt ein Aufgabeende A1, sowie ein Austragsende A2 auf der gegenüberliegenden Seite des Rollenbettes.From the dosing hopper 2 glued wood chips are discharged as a stream on the Austragswalzenanordnung 3 from the dosing bunker 2. The wood chips discharged from the dosing bunker 2 fall on the feeding end A1 of the spreading head assembly 4. The spreading head assembly 4 consists of a plurality of scattering rolls 6 arranged parallel to each other, with adjacent spreading rolls close to each other and a roll bed being formed. All scattering rollers 6 of the spreading head assembly 4 rotate in the same direction. This is shown by the arrows 7. The spreading head assembly 4 has a task end A1, and a discharge end A2 on the opposite side of the roller bed.

Durch die Streukopfanordnung 4 werden die Holzspäne zu einem Vlies 8 auf ein unterhalb der Streukopfanordnung 4 angeordneten kontinuierlich umlaufendes Formband 5 aufgestreut. Die Förderrichtung des Formbandes 5 ist durch den Pfeil 9 dargestellt. Wie es weiterhin aus der Figur ersichtlich ist, sind die Streuwalzen 6, d.h. die Längsachsen der Streuwalzen, quer zur Förderrichtung des Formbandes 5 angeordnet.By the spreading head assembly 4, the wood chips are arranged to a nonwoven 8 on a below the scattering head assembly 4 continuously circulating forming belt 5 scattered. The conveying direction of the forming belt 5 is represented by the arrow 9. As can be further seen from the figure, the scattering rollers 6, that is, the longitudinal axes of the scattering rollers, arranged transversely to the conveying direction of the forming belt 5.

Die Streuwalzen 6 des Rollenbettes sind mit einer Oberflächenstruktur versehen. Nähere Einzelheiten hierzu sind in den Figuren 2a, 2b, 2c ersichtlich. Durch die in die Streuwalzen 6 eingebrachten Oberflächenstrukturen, die als umlaufende Nuten ausgebildet sind, werden zwischen benachbarten Streuwalzen, die dicht aneinander anschließen, Streuspalte gebildet.The spreader rollers 6 of the roller bed are provided with a surface structure. Further details are in the FIGS. 2a, 2b , 2c can be seen. Due to the introduced into the scattering rollers 6 surface structures, which are formed as circumferential grooves, scattering gaps are formed between adjacent scattering rollers which close to each other.

Um eine Separierung des Streugutes zu erzielen, nimmt die Tiefe der in die Streuwalzen eingebrachten Nuten zwischen benachbarten Streuwalzen 6 von dem Aufgabeende A1 zu dem Austragsende A2 hin zu. Dies ist in der Figur zur Verdeutlichung durch einen von A1 zu A2 immer größer werdenden Abstand zwischen den Streuwalzen 6 dargestellt. Weiterhin schematisch dargestellt ist, daß somit am Aufgabeende sehr feines Streugut durch den Streuspalt gestreut und in Richtung auf das Austragsende hin immer größer werdendes Streugut durch die Streuspalte gestreut wird. Am Austragsende A2 der Streukopfanordnung ist eine Grobgutauffangeinrichtung 10 vorgesehen, durch die übergroße Streupartikel sowie Fremdkörper gesammelt und mittels einer Förderschnecke wegtransportiert werden können.In order to achieve a separation of the material to be spread, the depth of the grooves introduced into the spreading rolls between adjacent spreading rolls 6 increases from the feeding end A1 to the discharge end A2. This is illustrated in the figure for clarification by an increasing distance from A1 to A2 between the scattering rollers 6. Furthermore, it is shown schematically that thus scattered at the end of the task very fine spreading material through the spreading gap and in the direction of the discharge end towards ever-increasing spreading material is scattered through the spreading gaps. At the discharge end A2 of the spreading head arrangement, a coarse collecting device 10 is provided, through which oversized scattering particles and foreign bodies can be collected and transported away by means of a conveying screw.

Die in den Figuren 2a, 2b sowie 2c in Detailansicht dargestellten Streuwalzen 6 sind endseitig jeweils mit Lagerzapfen versehen. In die Mantelfläche der Streuwalzen 6 sind über die gesamte Länge der Streuwalzen 6 gleichmäßig verteilt parallel beabstandete Nuten 11 eingebracht. Jede Nut 11 ist, wie es aus Fig. 2a, 2b zu erkennen ist, als eine in sich geschlossene, umlaufende Nut 11 ausgebildet. Eine durch die Nut 11 verlaufende, gedachte Ebene, weist einen Winkel α zu einer auf der Längsachse = Rotationsachse 13 der Streuwalze 6 stehenden senkrechten Ebene 12 auf, der in diesem Ausführungsbeispiel 30° beträgt. Eine Vielzahl derartiger Nuten 11 sind in die Manteloberfläche eingebracht, die jeweils parallel zueinander verlaufen.The in the FIGS. 2a, 2b and 2c scattering rollers 6 shown in detail view are each provided with end journals. In the lateral surface of the scattering rollers 6 are distributed uniformly spaced grooves 11 over the entire length of the scattering rollers 6 introduced. Every groove 11 is how it looks Fig. 2a, 2b can be seen as a self-contained, circumferential groove 11 is formed. An imaginary plane passing through the groove 11 has an angle α to one the longitudinal axis = rotation axis 13 of the scattering roller 6 vertical plane 12, which is 30 ° in this embodiment. A plurality of such grooves 11 are introduced into the mantle surface, each extending parallel to each other.

Aus der Detailzeichnung kann man ersehen, daß die Nuten 11 in diesem Ausführungsbeispiel am Nutgrund 14 halbkreisförmig abgerundet sind. Es ist allerdings selbstverständlich, daß auch Nuten mit anderem Querschnitt in die Streuwalzen 6 eingebrachte werden könnenFrom the detailed drawing can be seen that the grooves 11 are rounded in this embodiment, the bottom of the groove 14 semicircular. However, it is self-evident that grooves with a different cross-section can be introduced into the scattering rollers 6

In der Figur 3a ist eine weitere Ausgestaltung von in die Streuwalzen 6 eingebrachten Nuten 11' dargestellt. Diese Nuten 11' sind ebenfalls als geschlossene um die Mantelfläche umlaufende Nuten 11' ausgebildet, die parallel zueinander verlaufen. Die Nuten 11' weisen einen zickzackförmigen Verlauf auf.In the FIG. 3a is a further embodiment of introduced into the scattering rollers 6 grooves 11 'shown. These grooves 11 'are also formed as a closed around the lateral surface circumferential grooves 11', which are parallel to each other. The grooves 11 'have a zigzag course.

Aus der Detailzeichnung der Figur 3b kann man ersehen, daß die Nuten 11' im Querschnitt trapezförmig ausgebildet sind.From the detailed drawing of FIG. 3b it can be seen that the grooves 11 'are trapezoidal in cross-section.

Es ist selbstverständlich, daß auch ein anderer Verlauf der in die Mantelfläche der Streuwalzen 6 eingebrachten Nuten 11' gewählt werden kann. Entscheidend dabei ist, daß die Nuten 11' um die Mantelfläche der Streuwalzen 6 als geschlossene Nuten 11,11' ausgebildet sind, und daß die Nuten 11,11' zumindest abschnittsweise in Bezug auf eine senkrecht auf der Längsachse 13 stehenden Ebene 12 schräg gestellte Bereiche aufweisen.It is understood that a different course of the introduced into the lateral surface of the scattering rollers 6 grooves 11 'can be selected. It is crucial that the grooves 11 'are formed around the lateral surface of the scattering rollers 6 as closed grooves 11,11', and that the grooves 11,11 'at least partially with respect to a plane perpendicular to the longitudinal axis 13 plane 12 obliquely Asked areas exhibit.

Benachbarte Streuwalzen 6 sind derart angetrieben und gekoppelt, daß sie zueinander wegsynchron laufen und sich die Nuten 11,11' der benachbarten Streuwalzen 6 bei Rotation immer gegenüberstehen und sich gegeneinander nicht verschieben. Somit ist sichergestellt, daß man als für die Separierung maßgebenden Streuspalt zweimal die Nuttiefe als gleichbleibenden Streuspalt über die gesamte Länge zwischen zwei benachbarten Streuwalzen 6 erhält. Durch die gleichbleibende Nuttiefe benachbarter Streuwalzen 6 wird ein gleichmäßigeres Streuergebnis über die Querschnittsbreite (Länge des Streuspaltes) erreicht.Neighboring spreader rollers 6 are driven and coupled so that they run away synchronous to each other and the grooves 11,11 'of the adjacent spreader rollers 6 always face each other during rotation and do not move against each other. Thus, it is ensured that the groove depth is twice as constant as the scattering gap that governs the separation Scouring gap over the entire length between two adjacent scattering rollers 6 receives. Due to the constant groove depth of adjacent scattering rollers 6 a more uniform scattering result over the cross-sectional width (length of the scattering gap) is achieved.

Die gleichbleibende Nuttiefe benachbarter Streuwalzen 6 wird auch erzielt, wenn die Streukopfanordnung 4 derart ausgebildet ist, daß sich jeweils eine mit einer Oberflächenstruktur versehene Streuwalze 6 mit einer glatten / unstrukturierten Streuwalze 6 abwechselt. Hierbei wird der für die Separierung maßgebende Streuspalt durch einmal die Nuttiefe gebildet.The uniform groove depth of adjacent scattering rollers 6 is also achieved when the spreading head assembly 4 is formed such that in each case provided with a surface structure scattering roller 6 with a smooth / unstructured scattering roller 6 alternates. In this case, the decisive for the separation Streuspalt is formed by once the groove depth.

Bei einem Stoffstrom, der beispielsweise aus unterschiedlich großen Holzspänen besteht, der auf das Auftragsende A1 der Streukopfanordnung 4 aufgegeben wird, wird der Stoffstrom aufgrund der Rotation der Streuwalzen 6 in Richtung auf das Austragsende A2 gefördert. Da die am Aufgabeende A1 angeordneten benachbarten Streuwalzen 6 Nuten mit einer geringeren Nuttiefe aufweisen, werden am Aufgabeende A1 zunächst feine Holzspäne gestreut. Durch die oben beschriebene Ausführung der Nuten 11,11', die schräg in die Manteloberfläche eingebracht sind, bzw. zumindest abschnittsweise schräg gestellte Bereiche aufweisen, werden die Späne, die durch den Streuspalt passen, bei Rotation der Streuwalzen 6 über einen bestimmten Querschnittsbereich oszillierend verteilt (Taumelbewegung). Hierdurch werden die gestreuten Späne auf einer breiteren Fläche und über die gesamte Streubreite gleichmäßig verteilt.In the case of a material flow which consists, for example, of wood chips of different sizes, which is applied to the application end A1 of the spreading head arrangement 4, the material flow is conveyed in the direction of the discharge end A2 due to the rotation of the scattering rollers 6. Since the adjacent spreading rollers 6 arranged at the end of the application A1 have grooves with a smaller groove depth, fine wood chips are first scattered at the end of the application A1. By the above-described embodiment of the grooves 11,11 ', which are obliquely introduced into the mantle surface, or at least partially obliquely Asked areas, the chips that fit through the spreading gap, distributed during rotation of the scattering rollers 6 over a certain cross-sectional area oscillating (wobble). As a result, the scattered chips are evenly distributed over a wider area and over the entire spreading width.

Da die Nuten 11,11' als geschlossene umlaufende Nuten 11,11' ausgebildet sind, werden größere Späne, die nicht durch den Spalt passen auf der Oberfläche der Streuwalzen 6 weitertransportiert. Es erfolgt durch die besondere Ausbildung der Nuten 11,11' keine Transportwirkung des nicht durch den Spalt passenden Streugutes in Querrichtung. Das nicht durch den Spalt passende Streugut wird durch Rotation der Streuwalzen 6, wie vorstehend beschrieben, weiter in Richtung auf das Austragsende A2 hin befördert und wird dann mittels der Förderschnecke der Grobgutauffangeinrichtung 10 aus dem Streuvorgang entfernt.Since the grooves 11,11 'are formed as closed circumferential grooves 11,11', larger chips that do not fit through the gap transported on the surface of the scattering rollers 6 are transported. It is due to the special design of the grooves 11,11 'no transport effect of not suitable by the gap material to be spread in the transverse direction. Not through the gap proper spreading material is conveyed by rotation of the scattering rollers 6, as described above, further toward the discharge end A2 and is then removed from the spreading operation by means of the screw conveyor of the coarse receiving device 10.

Bei der Herstellung von sehr breiten Holzwerkstoffplatten müssen die Streuwalzen 6 der Streukopfanordnung 4 entsprechend lang ausgeführt sein.In the production of very wide wood-based panels, the spreader rollers 6 of the spreading head assembly 4 must be made correspondingly long.

Bei Rotation der langen Streuwalzen 6 können sich benachbarte Streuwalzen 6 gegenseitig stabilisieren, da zwischen den Nuten 11,11' die Walzenoberfläche als glatte Oberfläche vorhanden ist und sich die Walzenoberfläche benachbarter Streuwalzen 6 bei Rotation immer gegenüberstehen bzw. dicht benachbart angeordnet sind und sich daher gegenseitig abstützen können.Upon rotation of the long spreader rollers 6, adjacent spreader rollers 6 can mutually stabilize because between the grooves 11,11 'the roller surface is present as a smooth surface and the roller surface of adjacent spreader rollers 6 always face each other during rotation and are arranged adjacent to each other and therefore mutually can support.

In Figur 4 ist eine weitere Ausführungsvariante der erfindungsgemäßen Streustation gemäß Figur 1 dargestellt.In FIG. 4 is a further embodiment of the scattering station according to the invention FIG. 1 shown.

Gleiche bereits zuvor beschriebene Teile sind mit den gleichen Bezugszeichen versehen.The same parts already described above are provided with the same reference numerals.

Bei dieser Ausführungsvariante ist die Streukopfanordnung 4 über eine Verschiebeeinheit 15 in Längsrichtung d.h. in Förderrichtung des Formbandes 5 verschiebbar angeordnet.In this embodiment, the spreading head assembly 4 via a displacement unit 15 in the longitudinal direction. slidably disposed in the conveying direction of the forming belt 5.

In Figur 4 ist eine Anordnung dargestellt, bei der ein Teil der Streuwalzen 6 unterhalb des Bodenbandes des Dosierbunkers 2 liegen und somit auf diesen Abschnitt A3 kein Stoffstrom von dem Austrag des Dosierbunkers 2 aufgegeben wird.In FIG. 4 an arrangement is shown in which a part of the scattering rollers 6 are below the bottom belt of the dosing bunker 2 and thus no substance flow is fed from the discharge of Dosierbunkers 2 on this section A3.

Das Aufgabeende A1' verschiebt sich somit auf die unter dem Austrag des Dosierbunkers liegenden Streuwalzen 6.The task end A1 'thus shifts to the scattering rollers 6 located below the discharge of the metering bunker.

Durch die oben beschriebene Anordnung, werden die Streuwalzen 6 des Abschnitts A3 verdeckt, so daß die gestreute Deckschichtfraktion bzw. die anschließend fertiggestellte Holzwerkstoffplatte eine gröbere Oberflächenbeschaffenheit aufweist.By the arrangement described above, the scattering rollers 6 of the section A3 are hidden, so that the scattered cover layer fraction or the subsequently finished wood-based panel has a coarser surface finish.

Aufgrund der verschiebbar angeordneten Streukopfanordnung kann somit eine Anpassung des Streuvorgangs an die herzustellende Holzwerkstoffplatte d.h. an die gewünschten Anwendungsgebiete als Bauplatte bzw. für die Möbelindustrie vorgenommen werden.Because of the displaceably arranged spreading head arrangement, it is therefore possible to adapt the spreading process to the wood-based panel to be produced. be made to the desired application areas as a building board or for the furniture industry.

Die erfindungsgemäße Streustation gemäß der oben beschriebenen Ausführungsformen kann auch zum Streuen von Mittelschichten eingesetzt werden.The scattering station according to the invention according to the embodiments described above can also be used for scattering middle layers.

Wie eingangs beschrieben, müssen die Streugüter hierbei möglichst homogen gestreut werden.As described above, the scattering materials must be scattered as homogeneously as possible.

Hierzu werden alle Streuwalzen 6 der Streugutanordnung mit den gleichen Nuttiefen ausgebildet, so daß der Streuspalt zwischen benachbarten Streuwalzen 6 vom Aufgabe- zum Austragsende hin gleichbleibend ist.For this purpose, all scattering rollers 6 of the spreading material arrangement are formed with the same groove depths, so that the spreading gap between adjacent spreading rollers 6 is constant from the feed end to the discharge end.

Claims (9)

  1. Spreader station for spreading glued spread materials, in particular wood chips, as part of the manufacturing of wood material panels, with a dosing hopper (2) for discharge of the glued spread materials, a spreader head arrangement (4) arranged downstream of same, comprising a feeding point (A1) and a discharge end (A2) as well as several spreading rolls (6) running parallel to each other, the circumferential surfaces of said spreading rolls being provided with grooves (11, 11') by which spreading gaps are formed between adjacent spreading rolls (6), the grooves (11, 11') forming, at least in partial sections, an angle α with a plane (12) which is perpendicular to the longitudinal axis (13) of the spreading roll (6), and the grooves (11, 11') being arranged parallel to each other over the entire length of the spreading rolls (6), and a continuously moving forming belt (5) being arranged under the spreader head arrangement (4),
    characterized in that the grooves (11, 11') are embodied as circumferential, closed grooves running around the circumferential surfaces of the spreading rolls and in that in the spreader head arrangement (4), rolls with a smooth surface are arranged adjacent to the groove-bearing (11, 11') spreading rolls (6).
  2. Spreader station for spreading glued spread materials, in particular wood chips, as part of the manufacturing of wood material panels, with a dosing hopper (2) for discharge of the glued spread materials, a spreader head arrangement (4) arranged downstream of same, comprising a feeding point (A1) and a discharge end (A2) as well as several spreading rolls (6) running parallel to each other, the circumferential surfaces of said spreading rolls being provided with grooves (11, 11') by which spreading gaps are formed between adjacent spreading rolls (6), the grooves (11, 11') forming, at least in partial sections, an angle α with a plane (12) which is perpendicular to the longitudinal axis (13) of the spreading roll (6), and the grooves (11, 11') being arranged parallel to each other over the entire length of the spreading rolls (6), and a continuously moving forming belt (5) being arranged under the spreader head arrangement (4),
    characterized in that the grooves (11, 11') are embodied as circumferential, closed grooves running around the circumferential surfaces of the spreading rolls and in that the spreading rolls (6) are driven and coupled in such a way that they run displacement synchronously to each other so that the grooves (11, 11') of adjacent spreading rolls (6) are opposite each other during rotation.
  3. Spreader station according to claim 1 or 2, characterized in that the grooves (11) are embodied as annular grooves (11).
  4. Spreader station according to one of the preceding claims, characterized in that the angle (α) is 30°.
  5. Spreader station according to one of the claims 1 to 4, characterized in that the grooves (11') are embodied as grooves (11') running in zigzag lines.
  6. Spreader station according to one of the claims 1 to 4, characterized in that the grooves (11) are embodied as S-shaped grooves (11).
  7. Spreader station according to one of the preceding claims, characterized in that the groove depth of the grooves (11, 11') increases from the feeding point (A1) to the discharge end (A2).
  8. Spreader station according to one of the preceding claims, characterized in that a coarse-material collecting device (10) is arranged following the discharge end (A2).
  9. Spreader station according to one of the preceding claims, characterized in that the spreader head arrangement (4) is mounted in such a way as to be displaceable in the direction of movement of the forming belt (5) by means of a displacement unit (15).
EP20030003033 2002-02-15 2003-02-12 Dispersing station for dispersing glued chips Expired - Fee Related EP1342543B1 (en)

Applications Claiming Priority (2)

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DE2002106594 DE10206594A1 (en) 2002-02-15 2002-02-15 Roller to scatter glued wood chips, for chipboard production, has a grooved surface structure at every second roller with an angled groove configuration for a homogenous spread over a large width
DE10206594 2002-02-15

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EP1342543A2 EP1342543A2 (en) 2003-09-10
EP1342543A3 EP1342543A3 (en) 2005-09-07
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DE19857498C1 (en) * 1998-12-14 2000-06-15 Siempelkamp Gmbh & Co Roller screen machine and its use
SE517232C2 (en) * 2000-09-21 2002-05-14 Valmet Fibertech Ab Method and apparatus for continuous molding of a fiber mat and forming mold for the apparatus
DE10064541A1 (en) * 2000-12-22 2003-04-30 Dieffenbacher Schenck Panel Equalizing roller

Also Published As

Publication number Publication date
EP1342543A2 (en) 2003-09-10
EP1342543A3 (en) 2005-09-07
DE50310987D1 (en) 2009-02-12
DE10206594A1 (en) 2003-08-28

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