EP0263919A2 - Apparatus for continuously moulding panels of a mineral material, in particular panels of fibre-reinforced plaster, from an aqueous slurry - Google Patents

Apparatus for continuously moulding panels of a mineral material, in particular panels of fibre-reinforced plaster, from an aqueous slurry Download PDF

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Publication number
EP0263919A2
EP0263919A2 EP87108461A EP87108461A EP0263919A2 EP 0263919 A2 EP0263919 A2 EP 0263919A2 EP 87108461 A EP87108461 A EP 87108461A EP 87108461 A EP87108461 A EP 87108461A EP 0263919 A2 EP0263919 A2 EP 0263919A2
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EP
European Patent Office
Prior art keywords
suspension
inlet
suction box
panels
suction
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
EP87108461A
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German (de)
French (fr)
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EP0263919B1 (en
EP0263919A3 (en
Inventor
Kurt Eibich
Josef Stipek
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Grenzebach BSH GmbH
Grenzebach GmbH and Co KG
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Babcock BSH AG
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Priority to AT87108461T priority Critical patent/ATE71870T1/en
Publication of EP0263919A2 publication Critical patent/EP0263919A2/en
Publication of EP0263919A3 publication Critical patent/EP0263919A3/en
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Publication of EP0263919B1 publication Critical patent/EP0263919B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
    • B28B5/027—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of the indefinite length type, e.g. belts, and being continuously fed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/526—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement by delivering the materials on a conveyor of the endless-belt type

Definitions

  • the invention relates to a device for the continuous molding of mineral slabs, in particular gypsum fiber slabs, from a suspension according to the preamble of patent claim 1.
  • DE-OS 33 16 946 a molding station is described, which consists of a lower circulating belt, on which the slurry is applied, and an upper circulating belt. Both belts are supported between deflection rollers on the side facing one another with supporting devices in such a way that a calibration or press gap corresponding to the desired plate thickness is produced between the two belts.
  • Support devices described in more detail have rectilinear, parallel contact surfaces, the press nip widens in a wedge shape on the inlet side.
  • This generic device is for the formation of plates from a suspension with considerable excess amounts of water - z.
  • Such a high proportion of water in the starting mixture is in the production of gypsum fiber boards from calcium sulfate dihydrate and fiber material - for.
  • the shaped plates are then dehydrated in an autoclave, the dihydrate becoming hemihydrate, and set to the required strength in the subsequent rehydration.
  • Such a process for the production of gypsum fiber boards is described in DE-OS 34 19 558.
  • the forming and dewatering station consists of a suction belt filter with a downstream belt press.
  • the invention has for its object to provide a generic molding device with which plates from a suspension of minerals and water, in particular calcium sulfate dihydrate and water, optionally with additional fiber material continuously drain to a certain water content and at the same time to dimensions within Have the tolerances required by the construction industry shaped.
  • the feature of claim 2 enables a variation of the wedge formed by the two support elements depending on the desired plate thickness and the drainage behavior of the suspension, so that the plate formed in the wedge is continuously compressed.
  • a plug forms in the limited liquid space in the wedge due to the outflow of water.
  • the suspension flows into the wedge due to the hydrostatic pressure.
  • the cavities created by the suction are filled in, as a result of which the shaped plates have a very uniform density.
  • the stirring device according to claim 6 prevents segregation of the gypsum fiber suspension when it is stored.
  • Claim 7 contains an advantageous embodiment of a suspension container with a stirring device.
  • Figure 1 shows a longitudinal section through a molding station according to the invention for the production of gypsum fiber boards from calcium sulfate dihydrate and waste paper fibers.
  • the molding station is made up of two molding steps 1, 2 arranged one behind the other in the transport direction, with a common base frame 3.
  • Each form step 1, 2 has a lower, circulating conveyor belt 4, 5, the upper conveying strand of which is supported on the inside by a support element which is fixedly mounted in the frame 3 and extends horizontally.
  • the support element of the first mold stage 1 consists of two rollers 6.1, 6.2, which are mounted at a distance from one another transversely to the transport direction, between which an evacuable suction box 7 is fastened.
  • the flat, perforated table surface of the suction box 7, over which the belt 4 slides, is flush with the upper circumference of the rollers 6.
  • the support element of the second mold stage 2 is constructed analogously, with the difference that instead of a suction box between the rollers 8.1, 8.2 there is a pressure box 9 with transverse slots.
  • Both belts 4, 5 are returned via deflection rollers 10 in the lower part of the base frame 3. Their upper, horizontal runs are each extended on the inlet side to a deflection roller 11, 12.
  • Each form step 1, 2 has an upper, circulating conveyor belt 13, 14, the lower run of which is supported on the inside in each case above the lower support elements by height-adjustable support elements.
  • the supported sections of the lower and upper belts 4, 13 and 5, 14 each form a shaped wedge in which the plates are formed.
  • the upper support element of the first molding stage 1 consists of two rollers 16.1, 16.2, which are mounted horizontally transversely at a distance in a pressure frame 15, and a suction box 17 fastened to the pressure frame 15 and supported on the upper side thereof between the two rollers 16.1, 16.2.
  • the lower surface of the suction box 17, which supports the belt 13, is aligned with the lower circumference of the rollers 16.1, 16.2.
  • the print frame 15 is articulated on the inlet and outlet sides above the rollers 16.1, 16.2 on vertical spindles 18.1, 18.2 which are height-adjustable independently of one another, and eccentrically on the inlet side.
  • the spindles are supported on the horizontal supports of the frame 3 at the top.
  • the upper support element of the second form stage 2 is constructed analogously. As with the lower support element, a pressure box 20 provided with transverse slots is fastened between the rollers 19.1, 19.2 instead of a suction box. The pressure box 20 is also fastened to a pressure frame 22 articulated on spindles 21.1, 21.2 and is thus supported in the frame 3.
  • Polyester belts with openings are used as conveyor belts, the width of which corresponds to the plates to be formed; usually between 600 and 2,800 mm.
  • the belts 5, 14 of the second forming stage 2 have finer openings, so that smooth surfaces can be achieved in the finished plates without post-treatment.
  • Each conveyor belt 4, 5, 13, 14 passes through a cleaning device 23 during the return.
  • pressure strips are arranged along the conveyor path, which form the plates on their long sides.
  • a roller table 24 connects to the second mold stage.
  • the suction boxes 7, 17 are coated on the supporting surface with a plastic with a low coefficient of friction, and the supporting surface the pressure boxes 9, 16 are formed by transverse strips made of glass fiber reinforced polyethylene.
  • a feed device 25 for the suspension is arranged above the part of the lower conveyor belt 4 of the first molding stage 1 which is extended on the inlet side.
  • the feed device 25 consists of a trough-shaped, Suspension container 26 extending across the belt 4 with a suspension inlet 27.
  • the container 26 has an outlet connection 28, which also extends over the entire range, the upper limit 28.1 of which extends to the upper roller 16.1 of the forming stage 1.
  • the lower limit 28.2 of the nozzle 28 extends to the lower suction box 7.
  • a stirring device 29 consisting of a rotatingly driven cage in the form of a horizontal cylinder, which is equipped on its outer surface with axially parallel stirring rods 30. Furthermore, a level probe 31 is located in the suspension container 26, and a compressed air line 32 is connected to its upper part.
  • the operation of the device when used to form gypsum fiber boards from a suspension with about 300 percent by weight of water (based on the solid) is described below, the solid being about 90 percent by weight of calcium sulfate dihydrate and about 10 percent by weight of fibers consists. Waste paper fibers are used as fiber material, the addition of other organic or inorganic fibers or wood chips is also possible.
  • the device according to the invention for forming plates from minerals other than gypsum, such as. B. cement or lime can be used.
  • the upper rollers 16.1, 19.1 on the inlet side are fixed at a somewhat greater distance from the table surface of the lower support elements than the rollers 16.2, 19.2 on the outlet side.
  • a wedge is thus formed between the conveyor belts 4, 13 and 5, 14, respectively which the plates are shaped.
  • the angle of inclination of the upper mold surface is adapted to the loss of volume as a result of the drainage so that an increasing pressure builds up against the support elements along each molding section. In the present example, the angle of inclination is 0.5 - 1 °. With the height adjustment via the spindles 18 and 21, it can be adapted to the respective requirements.
  • the feed device 25 is charged with the gypsum fiber suspension via the inlet 27.
  • the stirring device 28 prevents the suspension in the container 26 from segregating and thus ensures a uniform plate density and an even distribution of the fibers in the plate.
  • the suspension runs continuously through the nozzle 28 to the first molding stage 1, where water is continuously drawn off via the upper and lower suction boxes 7 and 17, respectively. Suction from both the top and bottom prevents the raw materials from segregating.
  • the solidifying cake is pulled by the conveyor belts 4, 13 through the wedge formed by the support elements, compacted and dewatered to about 35% residual moisture.
  • Two conveyor belts 4, 13 and 5, 14 arranged one above the other run synchronously.
  • the molding sections are so long that the boards are kept under pressure for at least 0.5 minutes; in the present embodiment, the molding distance is approximately 800 mm in each case.
  • the plates formed in the first stage 1 are then pressed further in the second stage 2 and calibrated to the desired plate thickness.
  • the water content is reduced to 25-30% residual moisture.
  • the water squeezed out of the plates flows through the transverse slots of the pressure boxes 9, 20.
  • the molded wedge between the pressure boxes 9, 20 is adapted to the reduced volume shrinkage in the second stage 2, the upper support element is therefore slightly less inclined to the horizontal than in the first stage 1.
  • the finished molded plates are further processed via a roller conveyor 24 or transported to a camp.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)

Abstract

The apparatus has an upper and a lower circulating, water-permeable transport belt (4, 13), which are led along the moulding section at a distance from each other and are supported in each case on the inside by supporting elements bearing against their surface area. The supporting elements comprise an evacuable suction box (7, 17), adjoined on the inlet side and on the outlet side by a transversely lying roll (6, 16) aligned circumferentially with the supporting surface. The distance between the supporting elements narrows in the direction of transport. In the case of a preferred embodiment, the upper supporting element can be adjusted vertically on the inlet side and on the outlet side independently, and there follows a pressing apparatus (2) of analogous construction, in which the suction boxes are replaced by pressure boxes (9, 20) provided with transverse slits. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum kontinu­ierlichen Formen von Mineralstoffplatten, insbesondere von Gipsfaserplatten, aus einer Suspension gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for the continuous molding of mineral slabs, in particular gypsum fiber slabs, from a suspension according to the preamble of patent claim 1.

Bei der Herstellung von Gipsplatten aus Calciumsulfat-­Halbhydrat ist es bekannt, aus dem Halbhydrat und Wasser einen fließfähigen Brei herzustellen, aus dem kontinu­ierlich in einer Formstation ein Plattenstrang geformt wird, der anschließend abbindet.In the production of gypsum boards from calcium sulfate hemihydrate, it is known to produce a flowable slurry from the hemihydrate and water, from which a sheet strand is continuously formed in a molding station, which then sets.

In der DE-OS 33 16 946 ist eine Formstation beschrieben, die aus einem unteren umlaufenden Band, auf das der Brei aufgetragen wird, und einem oberen umlaufenden Band be­steht. Beide Bänder werden zwischen Umlenkrollen auf der einander zugewandten Seite so mit Abstützvorrichtungen abgestützt, daß sich ein der gewünschten Plattendicke entsprechender Kalibrier- oder Preßspalt zwischen den beiden Bändern ergibt. Die in der DE-OS 33 16 946 nicht näher beschriebenen Abstützvorrichtungen weisen gerad­linige, parallele Anpreßflächen auf, einlaufseitig er­weitert sich der Preßspalt keilförmig.In DE-OS 33 16 946 a molding station is described, which consists of a lower circulating belt, on which the slurry is applied, and an upper circulating belt. Both belts are supported between deflection rollers on the side facing one another with supporting devices in such a way that a calibration or press gap corresponding to the desired plate thickness is produced between the two belts. Not in DE-OS 33 16 946 Support devices described in more detail have rectilinear, parallel contact surfaces, the press nip widens in a wedge shape on the inlet side.

Diese gattungsgemäße Vorrichtung ist zur Formung von Platten aus einer Suspension mit erheblichen Überschuß­mengen an Wasser - z. B. von Gipsfaserplatten aus einer Suspension mit 300 Gewichtsprozent Wasser bezogen auf den Gips - nicht geeignet, da beim Formen nicht entwässert werden kann. Ein derartig hoher Wasseranteil in der Aus­gangsmischung ist bei der Herstellung von Gipsfaser­platten aus Calciumsulfat-Dihydrat und Fasermaterial - z. B. Altpapierfasern - zum Erreichen einer gleichmäßigen Plattendichte erforderlich. Die geformten Platten werden anschließend in einem Autoklaven dehydratisiert, wobei das Dihydrat in Halbhydrat übergeht, und binden bei der nachfolgenden Rehydratation auf die geforderte Festigkeit ab. Ein derartiges Verfahren zur Herstellung von Gips­faserplatten ist in der DE-OS 34 19 558 beschrieben. Dort wird angeführt, daß die Form- und Entwässerungs­station aus einem Saugbandfilter mit einer nachge­schalteten Siebbandpresse besteht.This generic device is for the formation of plates from a suspension with considerable excess amounts of water - z. B. of gypsum fiber boards from a suspension with 300 weight percent water based on the gypsum - not suitable, since it cannot be dewatered during molding. Such a high proportion of water in the starting mixture is in the production of gypsum fiber boards from calcium sulfate dihydrate and fiber material - for. B. Waste paper fibers - required to achieve a uniform board density. The shaped plates are then dehydrated in an autoclave, the dihydrate becoming hemihydrate, and set to the required strength in the subsequent rehydration. Such a process for the production of gypsum fiber boards is described in DE-OS 34 19 558. There it is stated that the forming and dewatering station consists of a suction belt filter with a downstream belt press.

Es hat sich gezeigt, daß die Formung einer Gipsplatte aus einer Suspension auf Maße innerhalb der geforderten Toleranzen unter gleichzeitigem Erreichen eines be­stimmten Entwässerungsgrades und einer bestimmten Dichte mit besonderen Schwierigkeiten verbunden ist. Auf dem Markt befindliche Siebbandpressen oder Vakuumbandfilter, wie sie z. B. zur Schlammentwässerung eingesetzt werden, sind nicht in der Lage, diese Anforderungen zu erfüllen.It has been shown that the formation of a gypsum board from a suspension to dimensions within the required tolerances while simultaneously achieving a certain degree of drainage and a certain density is associated with particular difficulties. On the market screen belt presses or vacuum belt filters, such as z. B. used for sludge dewatering are not able to meet these requirements.

Die Erfindung hat sich die Aufgabe gestellt, eine gattungsgemäße Formvorrichtung zu schaffen, mit der sich Platten aus einer Suspension aus Mineralstoffen und Wasser, insbesondere aus Calciumsulfat-Dihydrat und Wasser, gegebenenfalls mit zusätzlichem Fasermaterial kontinuierlich auf einen bestimmten Wassergehalt ent­wässern und gleichzeitig auf Maße innerhalb der von der Bauindustrie geforderten Toleranzen formen lassen.The invention has for its object to provide a generic molding device with which plates from a suspension of minerals and water, in particular calcium sulfate dihydrate and water, optionally with additional fiber material continuously drain to a certain water content and at the same time to dimensions within Have the tolerances required by the construction industry shaped.

Diese Aufgabe wird durch die Merkmalskombination des Patentanspruchs 1 gelöst.This object is achieved by the combination of features of patent claim 1.

Das Merkmal des Patentanspruchs 2 ermöglicht eine Variation des von den beiden Abstützelementen gebildeten Keils in Abhängigkeit von der gewünschten Plattendicke und dem Entwässerungsverhalten der Suspension, so daß die im Keil entstehende Platte kontinuierlich verdichtet wird.The feature of claim 2 enables a variation of the wedge formed by the two support elements depending on the desired plate thickness and the drainage behavior of the suspension, so that the plate formed in the wedge is continuously compressed.

Während bei der Ausführungsform nach Patentanspruch 3 der Druckrahmen den Saugkasten gleichmäßig abstützt, lassen sich mit der Vorrichtung gemäß Patentanspruch 4 höhere Dichten bei der geformten Platte erreichen, sogleich wird der Wassergehalt weiter verringert.While in the embodiment according to claim 3 the pressure frame supports the suction box evenly, higher densities can be achieved with the formed plate with the device according to claim 4, immediately the water content is further reduced.

Bei der Aufgabevorrichtung gemäß Anspruch 5 bildet sich in dem begrenzten Flüssigkeitsraum im Keil durch Ablauf von Wasser ein Pfropfen. Durch den hydrostatischen Druck fließt die Suspension in den Keil nach. Es werden die durch das Absaugen entstandenen Hohlräume ausgefüllt, wodurch die geformten Platten eine sehr gleichmäßige Dichte aufweisen.In the feed device according to claim 5, a plug forms in the limited liquid space in the wedge due to the outflow of water. The suspension flows into the wedge due to the hydrostatic pressure. The cavities created by the suction are filled in, as a result of which the shaped plates have a very uniform density.

Die Rührvorrichtung nach Anspruch 6 verhindert das Ent­mischen der Gips-Faser-Suspension bei deren Bevorratung. Patentanspruch 7 enthält eine vorteilhafte Ausführungs­form eines Suspensionsbehälters mit einer Rührvor­richtung.The stirring device according to claim 6 prevents segregation of the gypsum fiber suspension when it is stored. Claim 7 contains an advantageous embodiment of a suspension container with a stirring device.

Die Zeichnung dient zur Erläuterung der Erfindung anhand eines vereinfacht dargestellten Ausführungsbeispiels.The drawing serves to explain the invention with reference to an embodiment shown in simplified form.

Figur 1 zeigt einen Längsschnitt durch eine erfindungs­gemäße Formstation zur Herstellung von Gipsfaserplatten aus Calciumsulfat-Dihydrat und Altpapierfasern.Figure 1 shows a longitudinal section through a molding station according to the invention for the production of gypsum fiber boards from calcium sulfate dihydrate and waste paper fibers.

Die Formstation baut sich aus zwei in Transportrichtung hintereinander angeordneten Formstufen 1, 2, mit einem gemeinsamen Grundgestell 3 auf. Jede Formstufe 1, 2, weist ein unteres, umlaufendes Transportband 4, 5 auf, dessen oberer fördernder Trum von einem fest im Gestell 3 ge­lagerten Abstützelement innen horizontal verlaufend abgestützt wird.The molding station is made up of two molding steps 1, 2 arranged one behind the other in the transport direction, with a common base frame 3. Each form step 1, 2 has a lower, circulating conveyor belt 4, 5, the upper conveying strand of which is supported on the inside by a support element which is fixedly mounted in the frame 3 and extends horizontally.

Das Abstützelement der ersten Formstufe 1 besteht aus zwei mit Abstand voneinander quer zur Transportrichtung gelagerten Walzen 6.1, 6.2, zwischen denen ein evakuier­barer Saugkasten 7 befestigt ist. Die ebene, mit Löchern versehene Tischfläche des Saugkastens 7, über die das Band 4 gleitet, fluchtet mit dem oberen Umfang der Walzen 6.The support element of the first mold stage 1 consists of two rollers 6.1, 6.2, which are mounted at a distance from one another transversely to the transport direction, between which an evacuable suction box 7 is fastened. The flat, perforated table surface of the suction box 7, over which the belt 4 slides, is flush with the upper circumference of the rollers 6.

Das Abstützelement der zweiten Formstufe 2 baut sich analog auf, mit dem Unterschied, daß sich anstelle eines Saugkastens zwischen den Walzen 8.1, 8.2 ein Quer­schlitze aufweisender Druckkasten 9 befindet.The support element of the second mold stage 2 is constructed analogously, with the difference that instead of a suction box between the rollers 8.1, 8.2 there is a pressure box 9 with transverse slots.

Beide Bänder 4, 5 werden über Umlenkrollen 10 im unteren Teil des Grundgestells 3 zurückgeführt. Ihre oberen, horizontal verlaufende Trums sind jeweils einlaufseitig bis zu einer Umlenkrolle 11, 12 verlängert.Both belts 4, 5 are returned via deflection rollers 10 in the lower part of the base frame 3. Their upper, horizontal runs are each extended on the inlet side to a deflection roller 11, 12.

Jede Formstufe 1, 2 weist ein oberes, umlaufendes Transportband 13, 14 auf, deren unterer Trum jeweils oberhalb der unteren Abstützelemente von höhenverstellbar gelagerten Abstützelementen innen abgestützt wird. Die abgestützten Strecken der unteren und oberen Bänder 4, 13 bzw. 5, 14 bilden so jeweils einen Formkeil, in dem die Platten geformt werden.Each form step 1, 2 has an upper, circulating conveyor belt 13, 14, the lower run of which is supported on the inside in each case above the lower support elements by height-adjustable support elements. The supported sections of the lower and upper belts 4, 13 and 5, 14 each form a shaped wedge in which the plates are formed.

Das obere Abstützelement der ersten Formstufe 1 besteht aus zwei in Abstand in einem Druckrahmen 15 horizontal querliegend gelagerten Walzen 16.1, 16.2 und einem an dem Druckrahmen 15 befestigten, von diesem an der Oberseite abgestützten Saugkasten 17 zwischen den beiden Walzen 16.1, 16.2. Die untere, das Band 13 abstützende Fläche des Saugkastens 17 fluchtet mit dem unteren Umfang der Walzen 16.1, 16.2. Der Druckrahmen 15 ist einlauf- und auslaufseitig jeweils oberhalb der Walzen 16.1, 16.2 an unabhängig voneinander höhenverstellbaren senkrechten Spindeln 18.1, 18.2 angelenkt, einlaufseitig exzentrisch. Die Spindeln sind oben an Horizontalträgern des Gestells 3 abgestützt.The upper support element of the first molding stage 1 consists of two rollers 16.1, 16.2, which are mounted horizontally transversely at a distance in a pressure frame 15, and a suction box 17 fastened to the pressure frame 15 and supported on the upper side thereof between the two rollers 16.1, 16.2. The lower surface of the suction box 17, which supports the belt 13, is aligned with the lower circumference of the rollers 16.1, 16.2. The print frame 15 is articulated on the inlet and outlet sides above the rollers 16.1, 16.2 on vertical spindles 18.1, 18.2 which are height-adjustable independently of one another, and eccentrically on the inlet side. The spindles are supported on the horizontal supports of the frame 3 at the top.

Das obere Abstützelement der zweiten Formstufe 2 baut sich analog auf. Ebenso wie bei dem unteren Abstütz­element ist zwischen den Walzen 19.1, 19.2 anstelle eines Saugkastens ein mit Querschlitzen versehener Druckkasten 20 befestigt. Der Druckkasten 20 ist ebenfalls an einem an Spindeln 21.1, 21.2 angelenkten Druckrahmen 22 be­festigt und so im Gestell 3 abgestützt.The upper support element of the second form stage 2 is constructed analogously. As with the lower support element, a pressure box 20 provided with transverse slots is fastened between the rollers 19.1, 19.2 instead of a suction box. The pressure box 20 is also fastened to a pressure frame 22 articulated on spindles 21.1, 21.2 and is thus supported in the frame 3.

Durch diese Abstützung der oberen Abstützelemente wird entlang der Formstrecke ein der Keilform entsprechender Druck beim Formen aufgebracht.Through this support of the upper support elements, a pressure corresponding to the wedge shape is applied during molding along the molding path.

Beim vorliegenden Ausführungsbeispiel folgt auf die Saugstufe 1 nur eine Preßstufe 2. Je nach Anwendungsfall können sich noch eine oder mehrere weitere Preßstufen anschließen.In the present exemplary embodiment, only one press stage 2 follows suction stage 1. Depending on the application, one or more further press stages can follow.

Als Transportbänder werde mit Öffnungen versehene Polyesterbänder eingesetzt, deren Breite den zu formenden Platten entspricht; üblicherweise zwischen 600 und 2.800 mm. Die Bänder 5, 14 der zweiten Formstufe 2 weisen feinere Öffnungen auf, so daß sich glatte Oberflächen bei den fertigen Platten ohne eine Nachbehandlung erreichen lassen. Jedes Transportband 4, 5, 13, 14 durchläuft während der Rückführung eine Reinigungsvorrichtung 23. Seitlich neben den Bandrändern sind entlang der Förder­strecke Druckleisten angeordnet, die die Platten an ihren Längsseiten formen. Auslaufseitig schließt sich an die zweite Formstufe ein Rollentisch 24 an.Polyester belts with openings are used as conveyor belts, the width of which corresponds to the plates to be formed; usually between 600 and 2,800 mm. The belts 5, 14 of the second forming stage 2 have finer openings, so that smooth surfaces can be achieved in the finished plates without post-treatment. Each conveyor belt 4, 5, 13, 14 passes through a cleaning device 23 during the return. To the side of the belt edges, pressure strips are arranged along the conveyor path, which form the plates on their long sides. On the outlet side, a roller table 24 connects to the second mold stage.

Zur Verringerung der Reibung zwischen den Bändern 4, 5 bzw. 13, 14 und den Saug- und Druckkästen 7, 17 bzw. 9, 20 sind die Saugkästen 7, 17 an der abstützenden Fläche mit einem Kunststoff mit geringem Reibwert beschichtet, und die Abstützfläche der Druckkästen 9, 16 wird von querliegenden Leisten aus glasfaserverstärktem Poly­äthylen gebildet.To reduce the friction between the belts 4, 5 and 13, 14 and the suction and pressure boxes 7, 17 and 9, 20, the suction boxes 7, 17 are coated on the supporting surface with a plastic with a low coefficient of friction, and the supporting surface the pressure boxes 9, 16 are formed by transverse strips made of glass fiber reinforced polyethylene.

Oberhalb des einlaufseitig verlängerten Teils des unteren Transportbandes 4 der ersten Formstufe 1 ist eine Auf­gabevorrichtung 25 für die Suspension angeordnet. Die Aufgabevorrichtung 25 besteht aus einem trogförmigen, sich quer über das Band 4 erstreckenden Suspensions­behälter 26 mit einem Suspensionszulauf 27. Am unteren Teil weist der Behälter 26 einen sich ebenfalls über die gesamte Bandbreite erstreckenden Auslaufstutzen 28 auf, dessen obere Begrenzung 28.1 bis an die obere Walze 16.1 der Formstufe 1 reicht. Die untere Begrenzung 28.2 des Stutzens 28 reicht bis an den unteren Saugkasten 7.A feed device 25 for the suspension is arranged above the part of the lower conveyor belt 4 of the first molding stage 1 which is extended on the inlet side. The feed device 25 consists of a trough-shaped, Suspension container 26 extending across the belt 4 with a suspension inlet 27. At the lower part, the container 26 has an outlet connection 28, which also extends over the entire range, the upper limit 28.1 of which extends to the upper roller 16.1 of the forming stage 1. The lower limit 28.2 of the nozzle 28 extends to the lower suction box 7.

Im Suspensionbehälter 26 befindet sich eine Rührvor­richtung 29, bestehend aus einem rotierend angetriebenen Käfig in Form eines waagerechten Zylinders, der auf seiner Mantelfläche mit achsparallelen Rührstäben 30 bestückt ist. Weiterhin befindet sich im Suspensions­behälter 26 eine Füllstandssonde 31, und an seinem oberen Teil ist eine Druckluftleitung 32 angeschlossen.In the suspension container 26 there is a stirring device 29, consisting of a rotatingly driven cage in the form of a horizontal cylinder, which is equipped on its outer surface with axially parallel stirring rods 30. Furthermore, a level probe 31 is located in the suspension container 26, and a compressed air line 32 is connected to its upper part.

Im folgenden wird die Funktionsweise der Vorrichtung beim Einsatz zur Formung von Gipsfaserplatten aus einer Suspension mit ca. 300 Gewichtsprozent Wasser (bezogen auf den Feststoff) beschrieben, wobei der Feststoff zu ca. 90 Gewichtsprozent aus Calciumsulfat-Dihydrat und zu ca. 10 Gewichtsprozent aus Fasern besteht. Als Faser­material werden Altpapierfasern eingesetzt, die Zugabe von anderen organischen oder anorganischen Fasern oder von Holzspänen ist ebenfalls möglich. Ebenso kann die Vorrichtung nach der Erfindung zur Formung von Platten aus anderen Mineralstoffen als Gips, wie z. B. Zement oder Kalk, verwendet werden.The operation of the device when used to form gypsum fiber boards from a suspension with about 300 percent by weight of water (based on the solid) is described below, the solid being about 90 percent by weight of calcium sulfate dihydrate and about 10 percent by weight of fibers consists. Waste paper fibers are used as fiber material, the addition of other organic or inorganic fibers or wood chips is also possible. Likewise, the device according to the invention for forming plates from minerals other than gypsum, such as. B. cement or lime can be used.

In Arbeitsstellung werden die einlaufseitigen oberen Walzen 16.1, 19.1 in etwas größerem Abstand von der Tischfläche der unteren Abstützelemente fixiert als die auslaufseitigen Walzen 16.2, 19.2. So wird zwischen den Transportbändern 4, 13 bzw. 5, 14 ein Keil gebildet, in dem die Platten geformt werden. Der Neigungswinkel der oberen Formfläche ist dem Volumenverlust als Folge der Entwässerung so angepaßt, daß sich entlang jeder Form­strecke ein steigender Druck gegen die Abstützelemente aufbaut. Im vorliegendem Beispiel beträgt der Neigungs­winkel 0,5 - 1 °. Mit der Höhenverstellung über die Spindeln 18 bzw. 21 kann er den jeweiligen Erfordernissen angepaßt werden.In the working position, the upper rollers 16.1, 19.1 on the inlet side are fixed at a somewhat greater distance from the table surface of the lower support elements than the rollers 16.2, 19.2 on the outlet side. A wedge is thus formed between the conveyor belts 4, 13 and 5, 14, respectively which the plates are shaped. The angle of inclination of the upper mold surface is adapted to the loss of volume as a result of the drainage so that an increasing pressure builds up against the support elements along each molding section. In the present example, the angle of inclination is 0.5 - 1 °. With the height adjustment via the spindles 18 and 21, it can be adapted to the respective requirements.

Die Aufgabevorrichtung 25 wird über den Zulauf 27 mit der Gips-Faser-Suspension beschickt. Die Rührvorrichtung 28 verhindert ein Entmischen der Suspension im Behälter 26 und sichert so eine gleichmäßige Plattendichte und eine Gleichverteilung der Fasern in der Platte. Die Suspension läuft kontinuierlich durch den Stutzen 28 der ersten Formstufe 1 zu, wo kontinuierlich über den oberen und unteren Saugkasten 7 bzw. 17 Wasser abgesaugt wird. Durch das Absaugen sowohl von der Oberseite als auch von der Unterseite wird ein Entmischen der Ausgangsmaterialien verhindert. Der sich verfestigende Kuchen wird von den Transportbändern 4, 13 durch den von den Abstützelementen gebildeten Keil gezogen, dabei verdichtet und auf ca. 35 % Restfeuchte entwässert. Jeweils zwei übereinander angeordnete Transportbänder 4, 13 bzw. 5, 14 laufen synchron. Da Gipsfaserplatten auf kurzzeitige Verfor­mungen elastisch reagieren - also in die ursprüngliche Form zurückspringen -, sind die Formstrecken so lang ausgeführt, daß die Platten für mindestens 0,5 Min. unter Druck gehalten werden; in der vorliegenden Ausführungs­form beträgt die Formstrecke jeweils ca. 800 mm.The feed device 25 is charged with the gypsum fiber suspension via the inlet 27. The stirring device 28 prevents the suspension in the container 26 from segregating and thus ensures a uniform plate density and an even distribution of the fibers in the plate. The suspension runs continuously through the nozzle 28 to the first molding stage 1, where water is continuously drawn off via the upper and lower suction boxes 7 and 17, respectively. Suction from both the top and bottom prevents the raw materials from segregating. The solidifying cake is pulled by the conveyor belts 4, 13 through the wedge formed by the support elements, compacted and dewatered to about 35% residual moisture. Two conveyor belts 4, 13 and 5, 14 arranged one above the other run synchronously. Since gypsum fibreboards react elastically to short-term deformations - that is, they spring back into their original shape - the molding sections are so long that the boards are kept under pressure for at least 0.5 minutes; in the present embodiment, the molding distance is approximately 800 mm in each case.

Anschließend werden die in der ersten Stufe 1 geformten Platten in der zweiten Stufe 2 weiter gepreßt und auf die gewünschte Plattendicke kalibriert. Dabei wird der Wassergehalt auf 25 - 30 % Restfeuchte verringert. Das aus den Platten ausgepreßte Wasser fließt über die Quer­schlitze der Druckkästen 9, 20 ab. Der Formkeil zwischen den Druckkästen 9, 20 ist dem verringerten Volumenschwund in der zweiten Stufe 2 angepaßt, das obere Abstützelement ist daher etwas geringer gegen die Horizontale geneigt als in der ersten Stufe 1. Die fertig geformten Platten werden über einen Rollengang 24 der weiteren Verarbeitung oder zu einem Lager befördert.The plates formed in the first stage 1 are then pressed further in the second stage 2 and calibrated to the desired plate thickness. The water content is reduced to 25-30% residual moisture. The water squeezed out of the plates flows through the transverse slots of the pressure boxes 9, 20. The molded wedge between the pressure boxes 9, 20 is adapted to the reduced volume shrinkage in the second stage 2, the upper support element is therefore slightly less inclined to the horizontal than in the first stage 1. The finished molded plates are further processed via a roller conveyor 24 or transported to a camp.

Claims (7)

1. Vorrichtung zum kontinuierlichen Formen von Mineral­stoffplatten, insbesondere von Gipsfaserplatten, aus einer Suspension,
- mit einem oberen und einem unteren umlaufenden Transportband, die entlang einer Strecke (Form­strecke) im Abstand voneinander geführt werden, wobei sie entlang der Formstrecke jeweils an der Innenseite von flächig anliegenden Elementen (Abstützelemente) abgestützt werden,
gekennzeichnet durch a) wasserdurchlässige Transportbänder (4, 13), b) Abstützelemente bestehend aus einem evakuier­baren Saugkasten (7, 17), an den sich einlauf- und auslaufseitig je eine querliegende, um­fänglich mit der Abstützfläche fluchtende Walze (6, 16) anschließt, und c) einen in Transportrichtung sich verengenden Abstand zwischen den Abstützelementen. 1. Device for the continuous shaping of mineral slabs, in particular gypsum fiber slabs, from a suspension,
with an upper and a lower circumferential conveyor belt, which are guided at a distance from one another along a section (molding section), wherein they are supported along the inside of the molding section on the inside in each case by flat elements (supporting elements),
marked by a) water-permeable conveyor belts (4, 13), b) supporting elements consisting of an evacuable suction box (7, 17), to each of which a transverse roller (6, 16) adjoins on the inlet and outlet sides, and c) a narrowing distance in the transport direction between the support elements. 2. Vorrichtung nach Anspruch 1, gekennzeichnet durch eine horizontal feststehende unter Abstützfläche und durch ein einlauf- und auslaufseitig unabhängig höhenver­stellbares oberes Abstützelement.2. Device according to claim 1, characterized by a horizontally fixed under support surface and by an inlet and outlet side independently height-adjustable upper support element. 3. Vorrichtung nach Anspruch 2, gekennzeichnet durch einen einlauf- und auslaufseitig höhenverstellbar im Grundgestell (3) abgestützten Druckrahmen (15), an dessen Unterseite der obere Saugkasten (17) befestigt ist, und in dem die oberen Walzen (16) gelagert sind.3. Apparatus according to claim 2, characterized by an inlet and outlet side height adjustable in the base frame (3) supported pressure frame (15), on the underside of which the upper suction box (17) is attached, and in which the upper rollers (16) are mounted. 4. Vorrichtung nach einem der Ansprüche 1 - 3, gekenn­zeichnet, durch eine nachfolgend angeordnete Preß­vorrichtung (2) mit den Merkmalen der Patentan­sprüche 1 - 3, wobei der Saugkasten durch einen mit Querschlitzen versehenen Druckkasten (9, 20) ersetzt ist.4. Device according to one of claims 1-3, characterized by a subsequently arranged pressing device (2) with the features of claims 1-3, wherein the suction box is replaced by a pressure box provided with transverse slots (9, 20). 5. Vorrichtung nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß das untere Transportband (4) der Vorrichtung (1) mit Saugkästen (7, 17) einlaufseitig verlängert ist, und daß oberhalb der Verlängerung eine Aufgabevorrichtung (25) für eine Suspension angeordnet ist, dia sus einem Suspensionsbehälter (26) mit einem Auslaufstutzen (28) besteht, dessen Öffnung sich über die Transportbandbreite erstreckt, wobei die obere Be­grenzung (28.1) des Stutzens bis an die obere einlauf­seitige Walze (16.1) und die untere Begrenzung (28.2) bis an den unteren Saugkasten (7) reicht.5. Device according to one of claims 1-4, characterized in that the lower conveyor belt (4) of the device (1) with suction boxes (7, 17) is extended on the inlet side, and that above the extension a feed device (25) for a suspension is arranged, dia sus a suspension container (26) with an outlet nozzle (28), the opening of which extends over the conveyor belt width, the upper boundary (28.1) of the nozzle up to the upper inlet-side roller (16.1) and the lower boundary (28.2 ) to the lower suction box (7). 6. Vorrichtung nach Anspruch 5, gekennzeichnet durch eine Rührvorrichtung (29) im Suspensionsbehälter (26).6. The device according to claim 5, characterized by a stirring device (29) in the suspension container (26). 7. Vorrichtung nach Anspruch 6, gekennzeichnet durch einen trogförmigen, sich quer über die Transport­bandbreite erstreckenden Suspensionsbehälter (26) mit einer Rührvorrichtung (29), bestehend aus einem rotierend angetriebenen Käfig in Form eines waagerechten Zylinders, der auf seiner Mantelfläche mit achsparallel sich erstreckenden Rührstäben (30) bestückt ist.7. The device according to claim 6, characterized by a trough-shaped, transversely extending across the transport bandwidth suspension container (26) with a stirring device (29), consisting of a rotatingly driven cage in the form of a horizontal cylinder which on its lateral surface with stirring rods extending parallel to the axis (30) is equipped.
EP87108461A 1986-10-10 1987-06-11 Apparatus for continuously moulding panels of a mineral material, in particular panels of fibre-reinforced plaster, from an aqueous slurry Expired - Lifetime EP0263919B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87108461T ATE71870T1 (en) 1986-10-10 1987-06-11 DEVICE FOR CONTINUOUS FORMING OF MINERAL BOARDS, ESPECIALLY GYPSUM BOARDS, FROM A SUSPENSION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3634604A DE3634604C2 (en) 1986-10-10 1986-10-10 Device for the continuous molding of mineral slabs, in particular gypsum fiber slabs, from a suspension
DE3634604 1986-10-10

Publications (3)

Publication Number Publication Date
EP0263919A2 true EP0263919A2 (en) 1988-04-20
EP0263919A3 EP0263919A3 (en) 1990-01-17
EP0263919B1 EP0263919B1 (en) 1992-01-22

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ID=6311500

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Application Number Title Priority Date Filing Date
EP87108461A Expired - Lifetime EP0263919B1 (en) 1986-10-10 1987-06-11 Apparatus for continuously moulding panels of a mineral material, in particular panels of fibre-reinforced plaster, from an aqueous slurry

Country Status (5)

Country Link
EP (1) EP0263919B1 (en)
AT (1) ATE71870T1 (en)
DE (2) DE3634604C2 (en)
ES (1) ES2029458T3 (en)
GR (1) GR3004179T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903641A1 (en) * 1989-02-08 1990-08-09 Fulgurit Baustoffe Gmbh METHOD FOR PRODUCING PLASTER FIBER PANELS
DE19824604C2 (en) * 1998-06-02 2003-02-27 Frank Reintjes Device for the production of building boards

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BE511420A (en) *
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US2097613A (en) * 1931-07-28 1937-11-02 Bemis Ind Inc Process and apparatus for making and coloring cement fiber and the like products
DE2149052A1 (en) * 1971-10-01 1973-04-05 Flessner Kg HORIZONTAL BELT PRESS FOR DRAINING SOLIDS
US3809566A (en) * 1972-05-26 1974-05-07 O Revord Gypsum-based building product and method of producing same
DE2365161A1 (en) * 1973-12-29 1975-07-03 Heidelberg Portland Zement Large plaster panels for internal building construction - made from gypsum mixed with reject cellulose pulp
DE2805883A1 (en) * 1977-02-14 1978-08-17 Andritz Ag Maschf Press for extn. of water from suspension - has overlapping rollers acting against outside of mesh bands (OE 15.6.78)
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Publication number Priority date Publication date Assignee Title
BE511420A (en) *
US2097613A (en) * 1931-07-28 1937-11-02 Bemis Ind Inc Process and apparatus for making and coloring cement fiber and the like products
AT137527B (en) * 1932-12-28 1934-05-11 Gustav Ing Ostersetzer Method and device for the production of panels from fibrous masses.
DE2149052A1 (en) * 1971-10-01 1973-04-05 Flessner Kg HORIZONTAL BELT PRESS FOR DRAINING SOLIDS
US3809566A (en) * 1972-05-26 1974-05-07 O Revord Gypsum-based building product and method of producing same
DE2365161A1 (en) * 1973-12-29 1975-07-03 Heidelberg Portland Zement Large plaster panels for internal building construction - made from gypsum mixed with reject cellulose pulp
DE2805883A1 (en) * 1977-02-14 1978-08-17 Andritz Ag Maschf Press for extn. of water from suspension - has overlapping rollers acting against outside of mesh bands (OE 15.6.78)
DE2941640A1 (en) * 1979-10-08 1981-04-09 Bell Maschinenfabrik Ag, Kriens MACHINE FOR PRODUCING BUILDING BOARDS

Also Published As

Publication number Publication date
ES2029458T3 (en) 1992-08-16
EP0263919B1 (en) 1992-01-22
DE3776254D1 (en) 1992-03-05
EP0263919A3 (en) 1990-01-17
DE3634604C2 (en) 1994-11-03
DE3634604A1 (en) 1988-04-14
GR3004179T3 (en) 1993-03-31
ATE71870T1 (en) 1992-02-15

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