EP1420926B1 - Method and device for producing gypsum plasterboards - Google Patents

Method and device for producing gypsum plasterboards Download PDF

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Publication number
EP1420926B1
EP1420926B1 EP02767350A EP02767350A EP1420926B1 EP 1420926 B1 EP1420926 B1 EP 1420926B1 EP 02767350 A EP02767350 A EP 02767350A EP 02767350 A EP02767350 A EP 02767350A EP 1420926 B1 EP1420926 B1 EP 1420926B1
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EP
European Patent Office
Prior art keywords
gypsum
suction
web
cardboard
manufacturing
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EP02767350A
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German (de)
French (fr)
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EP1420926A1 (en
Inventor
Hans-Joachim Smolenski
Sabine Albert
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Grenzebach BSH GmbH
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Grenzebach BSH GmbH
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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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/50—Producing shaped prefabricated articles from the material specially adapted for producing articles of expanded material, e.g. cellular concrete
    • 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
    • B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
    • B28B19/0092—Machines or methods for applying the material to surfaces to form a permanent layer thereon to webs, sheets or the like, e.g. of paper, cardboard

Definitions

  • the invention relates to a method for producing plasterboard according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 7.
  • the gypsum has a proportion of pores, which significantly influences the plate weight.
  • the porosity at the interface between gypsum and cardboard has the significant disadvantage that the bond between gypsum and cardboard and thus the stability of the entire plasterboard substantially deteriorates.
  • WO 95/32084 A1 discloses a method for producing plasterboard in which the bond between plaster and cardboard is to be improved.
  • a first layer and two marginal strips of gypsum with a relatively high density On a lower board web, a first layer and two marginal strips of gypsum with a relatively high density and then applied to the first layer and between the edge strips, a second layer of gypsum with relatively low density.
  • the surface thus formed is smoothed and covered with an upper board web.
  • the further treatment is carried out as usual by waiting the setting time and then cutting and drying the plates.
  • DE-AS 1 584 781 relates to a method for producing gypsum plasterboard provided with ribs on one side, in which gypsum slurry is applied to a lower, flat cardboard strip.
  • the gypsum slurry is formed with a mold corresponding to the ribs and covered with an upper rib-forming cardboard tape. So that the gypsum slurry penetrates into the rib-forming folds of the upper cardboard strip, they are supported by external negative pressure.
  • the cardboard gypsum pasteboard assembly thus formed is guided and held until the gypsum slurry solidifies and then cut into sheets.
  • the method does not relate to the production of plasterboard with a high percentage of pores in gypsum.
  • the negative pressure is applied only in the region of the ribs and thus acts over only a small part of the width of the arrangement.
  • the object of the invention is to provide a method for the production of plasterboard, which ensures a simple way a secure bond between gypsum and cardboard, which produces a plaster of relatively high density in the immediate vicinity of the carton, while the remaining gypsum as low as possible Density, so that lightweight panels are produced with high stability.
  • Another object is to provide a device for carrying out the method.
  • the first object is solved by the characterizing features of claim 1.
  • gypsum slurry can be used with high porosity. This causes a considerable weight saving of the finished plate without disadvantages at e.g. Strength and stability, which is associated, among other things, for the logistics and handling of the plate with significant advantages.
  • the second object is solved by the characterizing features of claim 5.
  • the device allows the implementation of the method according to the invention.
  • the onset of the negative pressure in the region of the forming station according to claim 2 has the greatest possible effectiveness, because so much free water is available.
  • a device according to the invention consists essentially of two unwinding devices, a forming station, means for aspiration with at least one suction device, transport devices, at least one cutting device and a drying device. For reasons of clarity, only the area of the forming station with the suction devices is shown in FIGS. 1 and 3.
  • a lower board web 1 is guided largely horizontally into the forming station 3 and further to the transport devices.
  • the forming station 3 consists essentially of a machine frame with a top and horizontally arranged plate 4, over which the board web 1 is guided, with a mixer 5, with means 6 for forming a gypsum board plate 7 with suction boxes 8, 9 suction devices of the means for suction.
  • the transport devices are connected to e.g. arranged a conveyor belt 10.
  • the means 6 for shaping have two lateral boundary strips, not shown, which run parallel to the transport direction 2 of the board web 1 in the region of the plate 4 as far as the distributing devices 11 and spaced from one another and determine the width of the gypsum board web 7. Furthermore, the means 6 for forming a base plate 12, a pressure plate 15 and hydraulic cylinder 16. In the height of the plate 4, the base plate 12, seen in the direction of transport 2 front edge is located in the upper level of the plate 4 and which rises laterally flat and then parallel to the plate 4 again. An upper board web 13 is guided over guide rollers 14 so that it extends parallel to and spaced from the region of the front edge of the base plate 12 to the lower board web 1. Above and parallel to the upper board web 13, the pressure plate 15 is arranged. She is vertical over the Hydraulic cylinder 16 so slidable that the distance between the base plate 12 and the pressure plate 15 corresponds exactly to the desired thickness of the gypsum board panel 7.
  • the suction boxes 8, 9 are fastened between the means 6 for shaping and the conveyor belt 10.
  • the lower suction box 9 is arranged so that its upwardly directed suction surface lies in a plane with the lower surface of the lower cardboard sheet 1. This plane is identical to the plane between the upper rear edge of the base plate 12 and the upper limit of the conveyor belt 10.
  • the upper suction box 8 is fixed so that its downward suction surface lies in a plane with the lower surface of the pressure plate 15.
  • the means for suction are shown in Figure 2: In this example, they essentially comprise the suction box 9, a pressure holding valve 17, a separator 18, a suction fan 19 and connecting pipes and measuring instruments, these means being arranged separately for each suction point.
  • the one longitudinal end of the suction box 9 is connected to the suction fan 19 via the separation device 18.
  • the other longitudinal end is connected to the pressure holding valve 17.
  • FIG. 1 Another embodiment for the area of a forming station 3 is shown in FIG. It is largely structured as the example of Figure 1 and differs therefrom in the means 6 for shaping and in the means for suction, the latter being carried out with suction rolls 20, 21.
  • the means 6 for shaping have two lateral boundary strips, not shown, which run at a distance from each other parallel to the transport direction 2 of the board web 1 and determine the width of the gypsum board web 7, and an upper suction roll 21.
  • the upper board web 13 is guided over guide rollers 14 to the upper suction roll 21, which is rotatably mounted so that its axis is horizontal and perpendicular to a longitudinal axis of the lower board web 1 and that the lower boundary is spaced from the plate 4.
  • the position of the axis is vertically adjustable.
  • the upper board web 13 is guided around the upper suction roll 21 and further in parallel and at a distance from the lower board web 1.
  • the lower board web 1 is continuously withdrawn from a roll in a unwinding device and passed over the plate 4 by the means 6 for forming on the conveyor belt 10.
  • gypsum powder water foaming agent and optionally further additives are continuously metered via the corresponding supply lines and mixed to form a porous gypsum slurry 22. This is distributed over the distribution devices 11 largely uniformly on the width of the continuous lower board web 1. The lateral boundary strips thereby prevent the gypsum slurry 22 from spreading beyond the edges of the lower board web 1.
  • the upper board web 13 which is supplied by a second unwinding, pressed onto the surface of not yet set gypsum slurry 22 and together with the lower board web 1 and the gypsum slurry 22 in the final shape of the gypsum board track 7 - thickness, width and possibly special shaping of the edge area - brought.
  • the pores are destroyed with decreasing distance to one of the board webs 1, 13 in the gypsum slurry, so that the density of the gypsum slurry in the region of the board webs 1, 13 is higher than in the remaining area. Especially at the interfaces between board webs 1, 13, the pores are almost completely destroyed.
  • supersaturated water is sucked into the board webs 1, 13 with dissolved gypsum.
  • the vacuum applied to the suction device is dependent on e.g. adapted to the carton quality and production speed.
  • the molded gypsum board panel 7 is further transported as known, wherein the gypsum slurry sets and hardens, cut to plates after setting and dried in the drying apparatus.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Finishing Walls (AREA)

Abstract

Known methods for producing gypsum plasterboards that have a low specific weight are often problematic in that pores reduce adhesion between the cardboard and the gypsum. Although many attempts have been made to improve adhesion, the plasterboards cannot be produced with the desired low specific weight. The aim of the invention is therefore to achieve with little effort, an excellent adhesion between the cardboard and the gypsum and to produce boards with as low a specific weight as possible. For this purpose, after application of the gypsum onto a cardboard web and before the gypsum has set, one of the cardboard webs is subjected to a negative pressure on the side facing away from the gypsum. The invention also relates to a method for producing the inventive gypsum plasterboards.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Gipskartonplatten gemäß dem Oberbegriff des Anspruchs 1 sowie eine Vorrichtung zur Durchführung des Verfahrens gemäß dem Oberbegriff des Anspruchs 7.The invention relates to a method for producing plasterboard according to the preamble of claim 1 and to an apparatus for carrying out the method according to the preamble of claim 7.

Für viele Verwendungen von Gipskartonplatten ist es wünschenswert, möglichst leichtgewichtige Platten einzusetzen. Hierfür hat zumindest ein Teil des Gipses einen Anteil an Poren, der maßgeblich das Plattengewicht beeinflußt. Die Porigkeit hat jedoch an der Grenzfläche zwischen Gips und Karton den wesentlichen Nachteil, daß sich der Verbund zwischen Gips und Karton und somit die Stabilität der gesamten Gipskartonplatte wesentlich verschlechtert.For many uses of plasterboard, it is desirable to use as lightweight panels as possible. For this purpose, at least a portion of the gypsum has a proportion of pores, which significantly influences the plate weight. However, the porosity at the interface between gypsum and cardboard has the significant disadvantage that the bond between gypsum and cardboard and thus the stability of the entire plasterboard substantially deteriorates.

Aus der WO 95/32084 A1 ist ein Verfahren zum Herstellen von Gipskartonplatten bekannt, bei dem der Verbund zwischen Gips und Karton verbessert werden soll. Auf eine untere Kartonbahn werden eine erste Schicht und zwei Randstreifen aus Gips mit relativ hoher Dichte sowie anschließend auf die erste Schicht und zwischen den Randstreifen eine zweite Schicht aus Gips mit relativ geringer Dichte aufgetragen. Die so gebildete Oberfläche wird geglättet und mit einer oberen Kartonbahn abgedeckt. Die weitere Behandlung erfolgt wie üblich durch Abwarten der Abbindezeit und anschließendes Schneiden und Trocknen der Platten.WO 95/32084 A1 discloses a method for producing plasterboard in which the bond between plaster and cardboard is to be improved. On a lower board web, a first layer and two marginal strips of gypsum with a relatively high density and then applied to the first layer and between the edge strips, a second layer of gypsum with relatively low density. The surface thus formed is smoothed and covered with an upper board web. The further treatment is carried out as usual by waiting the setting time and then cutting and drying the plates.

Die US 2,940,505 beschreibt ein Verfahren, bei dem die Kartonbahnen jeweils einseitig mit dünnflüssigem nicht abgebundem Gips imprägniert werden und anschließend die Platte auf bekannte Weise hergestellt wird.US Pat. No. 2,940,505 describes a method in which the board webs are each impregnated on one side with thin, non-hardened gypsum and subsequently the board is produced in a known manner.

Der Anmelderin ist es ebenfalls bekannt, für die Herstellung von Gipskartonplatten chemisch imprägnierten Karton zu verwenden, wobei die Imprägnierung die Poren im nicht abgebundenen Gipsbrei in der Grenzschicht zum Karton zerstören soll.It is also known to the Applicant to use chemically impregnated paperboard for the manufacture of plasterboard, which impregnation is intended to destroy the pores in the uncured gypsum slurry in the boundary layer to the paperboard.

Die bekannten Verfahren und Vorrichtungen haben den Nachteil, daß sie sehr aufwendig und damit mit hohen Kosten verbunden sind sowie nur unbefriedigenden Verbund zwischen Gips und Karton erzielen.The known methods and devices have the disadvantage that they are very expensive and therefore associated with high costs and achieve only unsatisfactory bond between gypsum and cardboard.

Die DE-AS 1 584 781 betrifft ein Verfahren zum Herstellen von einseitig mit Rippen versehenen Gipskartonplatten, bei dem auf ein unteres, ebenes Kartonband Gipsbrei aufgetragen wird. Der Gipsbrei wird mit einem Formwerkzeug entsprechend den Rippen geformt und mit einem oberen rippenbildenden Kartonband bedeckt. Damit der Gipsbrei in die rippenbildenden Auffaltungen des oberen Kartonbands eindringt, werden diese mit von aussen wirkendem Unterdruck unterstützt. Die so gebildete Karton- Gipsbrei- Karton- Anordnung wird bis zum Erstarren des Gipsbreis geführt und gehalten und dann in Platten geschnitten. Das Verfahren betrifft nicht die Herstellung von Gipsplatten mit einem hohen Porenanteil im Gips. Der Unterdruck wird nur im Bereich der Rippen aufgebracht und wirkt somit über nur einen kleinen Teil der Breite der Anordnung.DE-AS 1 584 781 relates to a method for producing gypsum plasterboard provided with ribs on one side, in which gypsum slurry is applied to a lower, flat cardboard strip. The gypsum slurry is formed with a mold corresponding to the ribs and covered with an upper rib-forming cardboard tape. So that the gypsum slurry penetrates into the rib-forming folds of the upper cardboard strip, they are supported by external negative pressure. The cardboard gypsum pasteboard assembly thus formed is guided and held until the gypsum slurry solidifies and then cut into sheets. The method does not relate to the production of plasterboard with a high percentage of pores in gypsum. The negative pressure is applied only in the region of the ribs and thus acts over only a small part of the width of the arrangement.

Aufgabe der Erfindung ist es, ein Verfahren zur Herstellung von Gipskartonplatten zu schaffen, das auf einfache Art einen sicheren Verbund zwischen Gips und Karton gewährleistet, das in der unmittelbarer Nähe zum Karton einen Gips mit relativ hoher Dichte erzeugt, während der restliche Gips eine möglichst niedrige Dichte aufweist, so daß leichtgewichtige Platten mit hoher Stabilität erzeugt werden.The object of the invention is to provide a method for the production of plasterboard, which ensures a simple way a secure bond between gypsum and cardboard, which produces a plaster of relatively high density in the immediate vicinity of the carton, while the remaining gypsum as low as possible Density, so that lightweight panels are produced with high stability.

Eine weitere Aufgabe besteht in der Schaffung einer Vorrichtung zur Durchführung des Verfahrens.Another object is to provide a device for carrying out the method.

Die erste Aufgabe ist durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The first object is solved by the characterizing features of claim 1.

Dadurch, daß nach dem Auftragen des Gipses und vor seinem Abbinden mindestens eine der Kartonbahnen an der dem Gips abgewandten Seite mit Unterdruck beaufschlagt wird, werden einerseits im Bereich des Kartons die Gasblasen im Gipsbrei zerstört. Hierdurch wird die Kontaktfläche zwischen Karton und Gips vergrößert und so der Verbund verbessert. Weiterhin wird die Dichte des Gipses zu den Querschnittsrändern der Gipskartonplatte hin erhöht, so daß die fertige Platte eine insgesamt größere Stabilität aufweist.Due to the fact that after application of the plaster and before its setting, at least one of the board webs is subjected to negative pressure on the side facing away from the gypsum, the gas bubbles in the gypsum slurry are destroyed on the one hand in the region of the cardboard. As a result, the contact area between cardboard and plaster is increased and thus improves the composite. Furthermore, the density of the gypsum is increased toward the cross-sectional edges of the plasterboard, so that the finished plate has an overall greater stability.

Andererseits wird aus dem Gipsbrei Wasser, das mit gelöstem Gips übersättigt ist, in den Karton gesaugt. Dieser gelöste Gips krisallisiert beim Abbinden und Trocknen aus und führt zu einer Vernadelung zwischen Gips und Karton, so daß hier ein inniger Verbund entsteht, der die erforderliche Biegefestigkeit gewährleistet.On the other hand, water that has been supersaturated with dissolved gypsum is sucked into the cardboard from the gypsum slurry. This dissolved gypsum crystallizes on setting and drying and leads to a needling between gypsum and cardboard, so that here an intimate bond is formed, which ensures the required bending strength.

Durch die beschriebenen Wirkungen der Absaugung wird insgesamt weiter erreicht, daß Gipsbrei mit hoher Porosität eingesetzt werden kann. Dies bewirkt eine erhebliche Gewichtseinsparung der fertigen Platte ohne Nachteile bei z.B. Festigkeit und Stabilität, was unter anderem für die Logistik und Handhabung der Platte mit erheblichen Vorteilen verbunden ist.Through the described effects of the suction overall is further achieved that gypsum slurry can be used with high porosity. This causes a considerable weight saving of the finished plate without disadvantages at e.g. Strength and stability, which is associated, among other things, for the logistics and handling of the plate with significant advantages.

Die zweite Aufgabe ist durch die kennzeichnenden Merkmale des Anspruchs 5 gelöst.The second object is solved by the characterizing features of claim 5.

Die Vorrichtung erlaubt die Durchführung des erfindungsgemäßen Verfahrens.The device allows the implementation of the method according to the invention.

Die Unteransprüche betreffen die vorteilhafte Ausgestaltung der Erfindung.The subclaims relate to the advantageous embodiment of the invention.

Das Einsetzen des Unterdrucks im Bereich der Formstation nach Anspruch 2 hat die größtmögliche Effektivität, weil so noch viel freies Wasser vorhanden ist.The onset of the negative pressure in the region of the forming station according to claim 2 has the greatest possible effectiveness, because so much free water is available.

Das Auswählen der Größe des Unterdrucks in Abhängigkeit von seiner Einwirkzeit und der Porosität des Kartons nach Anspruch 3 bewirkt, daß einerseits genügend Wasser angesaugt wird, um den gewünschten Effekt zu erreichen, und andererseits ein Kartonriß durch zu hohe Spannung infolge zu hohen Unterdrucks vermieden wird.Selecting the size of the negative pressure depending on its exposure time and the porosity of the carton according to claim 3 causes on the one hand enough water is sucked in to achieve the desired effect, and on the other hand, a cardboard crack is avoided by excessive voltage due to excessive negative pressure.

Durch das Vermischen zu einem Gipsbrei mit hohem Porenanteil nach Anspruch 4 können Platten mit besonders geringem spezifischen Gewicht hergestellt werden.By mixing into a gypsum slurry with a high percentage of pores according to claim 4 plates can be produced with very low specific weight.

Die Erfindung wird anhand vereinfacht dargestellter Beispiele näher erläutert. Es zeigen

  • Figur 1 den Bereich der Formstation einer erfindungsgemäßen Vorrichtung zum Herstellen von Gipskartonplatten mit Saugkästen senkrecht von der Seite,
  • Figur 2 Mittel zum Absaugen am Beispiel eines Saugkastens als Schema und
  • Figur 3 den Bereich der Formstation einer anderen erfindungsgemäßen Vorrichtung mit Saugwalzen senkrecht von der Seite.
The invention will be explained in more detail with reference to simplified examples. Show it
  • FIG. 1 shows the area of the forming station of a device according to the invention for producing plasterboard with suction boxes vertically from the side,
  • Figure 2 means for suction on the example of a suction box as a scheme and
  • Figure 3 shows the area of the forming station of another device according to the invention with suction rolls perpendicular from the side.

Eine erfindungsgemäße Vorrichtung besteht im wesentlichen aus zwei Abwickelvorrichtungen, einer Formstation, Mitteln zum Absaugen mit mindestens einer Absaugvorrichtung, Transportvorrichtungen, mindestens einer Schneidvorrichtung und einer Trocknungsvorrichtung. Aus Gründen der Übersichtlichkeit ist in den Figuren 1 und 3 nur der Bereich der Formstation mit jeweils den Absaugvorrichtungen dargestellt.A device according to the invention consists essentially of two unwinding devices, a forming station, means for aspiration with at least one suction device, transport devices, at least one cutting device and a drying device. For reasons of clarity, only the area of the forming station with the suction devices is shown in FIGS. 1 and 3.

Wie aus Figur 1 ersichtlich ist eine untere Kartonbahn 1 weitestgehend horizontal in die Formstation 3 und weiter zu den Transportvorrichtungen geführt. Die Formstation 3 besteht im wesentlichen aus einem Maschinengestell mit einer oben und horizontal angeordneten Platte 4, über die die Kartonbahn 1 geführt ist, mit einem Mischer 5, mit Mitteln 6 zum Formen einer Gipskartonplattenbahn 7 mit als Saugkästen 8, 9 ausgebildeten Absaugvorrichtungen der Mittel zum Absaugen. In Transportrichtung 2 (dargestellt durch Pfeil 2) hinter der Formstation 3 sind die Transportvorrichtungen mit z.B. einem Förderband 10 angeordnet.As can be seen from FIG. 1, a lower board web 1 is guided largely horizontally into the forming station 3 and further to the transport devices. The forming station 3 consists essentially of a machine frame with a top and horizontally arranged plate 4, over which the board web 1 is guided, with a mixer 5, with means 6 for forming a gypsum board plate 7 with suction boxes 8, 9 suction devices of the means for suction. In the transport direction 2 (represented by arrow 2) behind the forming station 3, the transport devices are connected to e.g. arranged a conveyor belt 10.

Am Mischer 5, der oberhalb der Platte 4 positioniert ist, sind nicht dargestellte Zuführungen für Gipspulver, Wasser und Zuschlagstoffe angeordnet. Am unteren Ende des Mischers 5 an entsprechenden Öffnungen sind auf die Kartonbahn 1 gerichtete Verteilvorrichtungen 11 angeordnet.At the mixer 5, which is positioned above the plate 4, not shown feeds for gypsum powder, water and aggregates are arranged. At the lower end of the mixer 5 at corresponding openings directed onto the cardboard web 1 distribution devices 11 are arranged.

Die Mittel 6 zum Formen weisen zwei nicht dargestellte seitliche Begrenzungsleisten auf, die in den Bereich der Platte 4 bis zu den Verteilvorrichtungen 11 und voneinander beabstandet parallel zur Transportrichtung 2 der Kartonbahn 1 verlaufen und die Breite der Gipskartonplattenbahn 7 bestimmen. Weiterhin weisen die Mittel 6 zum Formen eine Grundplatte 12, eine Druckplatte 15 und Hydraulikzylinder 16 auf. In der Höhe der Platte 4 ist die Grundplatte 12, deren in Transportrichtung 2 gesehen vordere Kante in der oberen Ebene der Platte 4 liegt und die im weiteren Verlauf flach ansteigt und dann wieder parallel zur Platte 4 verläuft. Eine obere Kartonbahn 13 ist über Umlenkwalzen 14 so geführt, daß sie ab dem Bereich der vorderen Kante der Grundplatte 12 parallel und beabstandet zur unteren Kartonbahn 1 verläuft. Oberhalb und parallel zur oberen Kartonbahn 13 ist die Druckplatte 15 angeordnet. Sie ist vertikal über die Hydraulikzylinder 16 so verschiebbar, daß der Abstand zwischen der Grundplatte 12 und der Druckplatte 15 genau der gewünschten Dicke der Gipskartonplattenbahn 7 entspricht.The means 6 for shaping have two lateral boundary strips, not shown, which run parallel to the transport direction 2 of the board web 1 in the region of the plate 4 as far as the distributing devices 11 and spaced from one another and determine the width of the gypsum board web 7. Furthermore, the means 6 for forming a base plate 12, a pressure plate 15 and hydraulic cylinder 16. In the height of the plate 4, the base plate 12, seen in the direction of transport 2 front edge is located in the upper level of the plate 4 and which rises laterally flat and then parallel to the plate 4 again. An upper board web 13 is guided over guide rollers 14 so that it extends parallel to and spaced from the region of the front edge of the base plate 12 to the lower board web 1. Above and parallel to the upper board web 13, the pressure plate 15 is arranged. She is vertical over the Hydraulic cylinder 16 so slidable that the distance between the base plate 12 and the pressure plate 15 corresponds exactly to the desired thickness of the gypsum board panel 7.

Wie aus Figur 1 weiter ersichtlich ist, sind zwischen den Mitteln 6 zum Formen und dem Transportband 10 die Saugkästen 8, 9 befestigt. Der untere Saugkasten 9 ist so angeordnet, daß seine nach oben gerichtete Saugfläche in einer Ebene mit der unteren Fläche der unteren Kartonbahn 1 liegt. Diese Ebene ist identisch mit der Ebene zwischen der oberen hinteren Kante der Grundplatte 12 und der oberen Begrenzung des Transportbands 10. Der obere Saugkasten 8 ist so befestigt, daß seine nach unten gerichtete Saugfläche in einer Ebene mit der unteren Fläche der Druckplatte 15 liegt.As can also be seen from FIG. 1, the suction boxes 8, 9 are fastened between the means 6 for shaping and the conveyor belt 10. The lower suction box 9 is arranged so that its upwardly directed suction surface lies in a plane with the lower surface of the lower cardboard sheet 1. This plane is identical to the plane between the upper rear edge of the base plate 12 and the upper limit of the conveyor belt 10. The upper suction box 8 is fixed so that its downward suction surface lies in a plane with the lower surface of the pressure plate 15.

Die Mittel zum Absaugen sind in Figur 2 dargestellt: Sie umfassen in diesem Beispiel im wesentlichen den Saugkasten 9, ein Druckhalteventil 17, eine Abscheidevorrichtung 18, ein Sauggebläse 19 sowie verbindende Rohrleitungen und Meßgeräte, wobei diese Mittel für jede Absaugstelle separat angeordnet sind. Das eine längsseitige Ende des Saugkastens 9 ist über die Abscheidevorrichtung 18 mit dem Saugventilator 19 verbunden. Das andere längsseitige Ende ist mit dem Druckhalteventil 17 verbunden.The means for suction are shown in Figure 2: In this example, they essentially comprise the suction box 9, a pressure holding valve 17, a separator 18, a suction fan 19 and connecting pipes and measuring instruments, these means being arranged separately for each suction point. The one longitudinal end of the suction box 9 is connected to the suction fan 19 via the separation device 18. The other longitudinal end is connected to the pressure holding valve 17.

Es ist auch möglich, mehrere Saugkästen 8, 9 mit einer Abscheidevorrichtung 18 und einem Saugventilator 19 zu verbinden.It is also possible to connect a plurality of suction boxes 8, 9 with a separating device 18 and a suction fan 19.

Ein anderes Ausführungsbeispiel für den Bereich einer Formstation 3 ist in Figur 3 dargestellt. Es ist weitgehend so aufgebaut wie das Bespiel der Figur 1 und unterscheidet sich hiervon in den Mitteln 6 zum Formen und in den Mitteln zum Absaugen, wobei die letzteren mit Saugwalzen 20, 21 ausgeführt sind.Another embodiment for the area of a forming station 3 is shown in FIG. It is largely structured as the example of Figure 1 and differs therefrom in the means 6 for shaping and in the means for suction, the latter being carried out with suction rolls 20, 21.

Die Mittel 6 zum Formen weisen zwei nicht dargestellte seitliche Begrenzungsleisten, die voneinander beabstandet parallel zur Transportrichtung 2 der Kartonbahn 1 verlaufen und die Breite der Gipskartonplattenbahn 7 bestimmen, sowie eine obere Saugwalze 21 auf. Die obere Kartonbahn 13 ist über Umlenkwalzen 14 zu der oberen Saugwalze 21 geführt, die drehbar so gelagert ist, daß ihre Achse horizontal sowie senkrecht zu einer Längsachse der unteren Kartonbahn 1 ist und daß die untere Begrenzung von der Platte 4 beabstandet ist. Die Lage der Achse ist vertikal verstellbar. Die obere Kartonbahn 13 ist um die obere Saugwalze 21 und weiter parallel und beabstandet zu der unteren Kartonbahn 1 geführt.The means 6 for shaping have two lateral boundary strips, not shown, which run at a distance from each other parallel to the transport direction 2 of the board web 1 and determine the width of the gypsum board web 7, and an upper suction roll 21. The upper board web 13 is guided over guide rollers 14 to the upper suction roll 21, which is rotatably mounted so that its axis is horizontal and perpendicular to a longitudinal axis of the lower board web 1 and that the lower boundary is spaced from the plate 4. The position of the axis is vertically adjustable. The upper board web 13 is guided around the upper suction roll 21 and further in parallel and at a distance from the lower board web 1.

Im Bereich der Mittel 6 zum Formen ist eine untere Saugwalze 20 in einer entsprechenden Aussparung der Platte 4 so drehbar gelagert, daß die obere Begrenzung der unteren Saugwalze 20 in der oberen Ebene der Platte 4 liegt und daß die Achse senkrecht unter der in Richtung des Pfeils 2 gesehen vorderen Begrenzung der oberen Saugwalze 21 liegt.In the area of the means 6 for forming a lower suction roll 20 is rotatably supported in a corresponding recess of the plate 4 so that the upper limit of the lower suction roll 20 is in the upper plane of the plate 4 and that the axis perpendicular to the in the direction of the arrow 2 seen front boundary of the upper suction roller 21 is located.

Im Betrieb wird die untere Kartonbahn 1 in einer Abrollvorrichtung kontinuierlich von einer Rolle abgezogen und über die Platte 4 durch die Mittel 6 zum Formen auf das Transportband 10 geführt. In den Mischer 5 werden kontinuierlich über die entsprechenden Zuführleitungen Gipspulver, Wasser Schaumbildner und gegebenenfalls weitere Zuschlagstoffe dosiert und zu einem porösen Gipsbrei 22 vermischt. Dieser wird über die Verteileinrichtungen 11 weitgehend gleichmäßig auf der Breite der durchlaufenden unteren Kartonbahn 1 verteilt. Die seitlichen Begrenzungsleisten verhindern dabei, daß sich der Gipsbrei 22 über die Ränder der unteren Kartonbahn 1 hinaus ausbreitet. In den Mitteln 6 zum Formen wird auf bekannte Weise die obere Kartonbahn 13, die von einer zweiten Abrollvorrichtung zugeführt wird, auf die Oberfläche des noch nicht abgebundenen Gipsbreis 22 gedrückt und zusammen mit der unteren Kartonbahn 1 und dem Gipsbrei 22 in die endgültige Form der Gipskartonplattenbahn 7 - Dicke, Breite und gegebenenfalls spezielle Ausformung des Randbereichs - gebracht. Gleichzeitig werden z.B. die Ränder der unteren Kartonbahn 1, die entsprechend breiter als die obere Kartonbahn 13 ist, nach oben umgeklappt und mit dieser überlappend verbunden.In operation, the lower board web 1 is continuously withdrawn from a roll in a unwinding device and passed over the plate 4 by the means 6 for forming on the conveyor belt 10. In the mixer 5 gypsum powder, water foaming agent and optionally further additives are continuously metered via the corresponding supply lines and mixed to form a porous gypsum slurry 22. This is distributed over the distribution devices 11 largely uniformly on the width of the continuous lower board web 1. The lateral boundary strips thereby prevent the gypsum slurry 22 from spreading beyond the edges of the lower board web 1. In the means 6 for molding is in a known manner, the upper board web 13, which is supplied by a second unwinding, pressed onto the surface of not yet set gypsum slurry 22 and together with the lower board web 1 and the gypsum slurry 22 in the final shape of the gypsum board track 7 - thickness, width and possibly special shaping of the edge area - brought. At the same time, e.g. the edges of the lower board web 1, which is correspondingly wider than the upper board web 13, folded up and connected to this overlapping.

Im Bereich der Mittel 6 zum Formen, wo der Gipsbrei noch nicht abgebunden ist, bringen die Absaugvorrichtungen wie z.B. die Saugkästen 8, 9 oder die Saugwalzen 20, 21 einen Unterdruck von z.B. - 0,2 bar (= 0,8 bar(abs)) auf die dem Gipsbrei 22 abgewandten Seite sowohl der unteren Kartonbahn 1 als auch der oberen Kartonbahn 13 auf. Hierdurch werden zwei Effekte erreicht: Einerseits werden mit abnehmender Entfernung zu einer der Kartonbahnen 1, 13 im Gipsbrei die Poren zerstört, so daß die Dichte des Gipsbreis im Bereich der Kartonbahnen 1, 13 höher ist als im übrigen Bereich. Besonders an den Grenzflächen zwischen Kartonbahnen 1, 13 werden die Poren fast vollständig zerstört. Andererseits wird mit gelöstem Gips übersättigtes Wasser in die Kartonbahnen 1, 13 gesaugt.In the area of the molding means 6, where the gypsum slurry has not yet set, the suction devices, e.g. the suction boxes 8, 9 or the suction rolls 20, 21 have a negative pressure of e.g. - 0.2 bar (= 0.8 bar (abs)) on the gypsum slurry 22 side facing away from both the lower board web 1 and the upper board web 13. As a result, two effects are achieved: On the one hand, the pores are destroyed with decreasing distance to one of the board webs 1, 13 in the gypsum slurry, so that the density of the gypsum slurry in the region of the board webs 1, 13 is higher than in the remaining area. Especially at the interfaces between board webs 1, 13, the pores are almost completely destroyed. On the other hand, supersaturated water is sucked into the board webs 1, 13 with dissolved gypsum.

So entsteht ein sehr guter Verbund zwischen Gips und Kartonbahn 1, 13, wobei ein relativ geringes spezifisches Gewicht der fertigen Gipskartonplatte erzielt wird. Denn in der Mitte der Dicke der Gipskartonplatte weist der Gips eine hohe Porosität auf, die in Richtung des Kartons hin abnimmt. So konnte z.B. für eine Gipskartonplatte mit einer Dicke von 12,5 mm das Gewicht auf 7,6 kg/m2 reduziert werden, während mit den bekannten Verfahren die Untergrenze bei ca. 9 kg/m2 liegt.This results in a very good bond between gypsum and board web 1, 13, with a relatively low specific weight of the finished plasterboard is achieved. Because in the middle of the thickness of the plasterboard, the plaster has a high porosity, which decreases in the direction of the cardboard out. For example, for a plasterboard with a thickness of 12.5 mm, the weight could be reduced to 7.6 kg / m 2 , while with the known method, the lower limit is about 9 kg / m 2 .

Der an der Absaugvorrichtung anliegende Unterdruck wird in Abhängigkeit von z.B. der Kartonqualität und der Produktionsgeschwindigkeit angepaßt.The vacuum applied to the suction device is dependent on e.g. adapted to the carton quality and production speed.

Die geformte Gipskartonplattenbahn 7 wird weiter wie bekannt transportiert, wobei der Gipsbrei abbindet und aushärtet, nach dem Abbinden zu Platten geschnitten und in der Trockenvorrichtung getrocknet.The molded gypsum board panel 7 is further transported as known, wherein the gypsum slurry sets and hardens, cut to plates after setting and dried in the drying apparatus.

Claims (13)

  1. A process for manufacturing gypsum plasterboards with a low specific weight,
    in which a lower cardboard web is continuously unwound from a first roll and an upper cardboard web is continuously unwound from a second roll,
    in which, in a moulding station,
    - the lower cardboard web is conveyed further in a horizontal position,
    - gypsum is mixed with water and pore forming material,
    - distributed substantially uniformly over the lower cardboard web,
    - covered with an upper cardboard web
    - and the gypsum plasterboard web produced is moulded,
    and in which the gypsum plasterboard web is transported further and, after the gypsum has set, is cut into boards which are dried,
    characterised in that, after the gypsum has been distributed and before it has set, at least one of the cardboard webs (1, 13) is acted upon by negative pressure on its side remote from the gypsum, the negative pressure being applied perpendicularly to the transport direction (2) in an area over the entire width of the cardboard web (1, 13) .
  2. A process for manufacturing gypsum plasterboards according to Claim 1, characterised in that the negative pressure is applied after the moulding of the gypsum plasterboard web (7).
  3. A process for manufacturing gypsum plasterboards according to Claim 1 or 2, characterised in that the negative pressure is applied before the moulding of the gypsum plasterboard web (7).
  4. A process for manufacturing gypsum plasterboards according to Claim 1 to 3, characterised in that the negative pressure is applied during the moulding of the gypsum plasterboard web (7).
  5. A process for manufacturing gypsum plasterboards according to one of Claims 1 to 4, characterised in that the degree of negative pressure is selected depending on its residence time and the porosity of the cardboard.
  6. A process for manufacturing gypsum plasterboards according to one of Claims 1 to 5, characterised in that the gypsum is mixed with water and pore forming material such that a gypsum paste with a high pore count is produced.
  7. A device for manufacturing gypsum plasterboards with a low specific weight,
    having a first unwinding device for a lower cardboard web and a second unwinding device for an upper cardboard web, having a moulding station,
    having means for guiding the lower cardboard web in a horizontal position,
    having a mixer for mixing gypsum with water and pore forming materials,
    having a distributing device and means for moulding the gypsum plasterboard web,
    having transport devices, at least one cutting device and
    having a drying device, characterised by
    suction means having at least one suction device, which is arranged in the region between the distributing device (11) and the cutting device on a side, remote from the gypsum, of one of the cardboard webs (1, 13), the suction face of the suction device being located in an area over the entire width of the cardboard web (1, 13).
  8. A device for manufacturing gypsum plasterboards according to Claim 7, characterised in that the suction device is arranged downstream of the moulding means (6), as seen in the transport direction (2).
  9. A device for manufacturing gypsum plasterboards according to Claim 7 or 8, characterised in that the suction device is arranged upstream of the moulding means (6), as seen in the transport direction (2).
  10. A device for manufacturing gypsum plasterboards according to one of Claims 7 to 9, characterised in that the suction device is provided as the moulding means (6).
  11. A device for manufacturing gypsum plasterboards according to one of Claims 7 to 10, characterised in that the suction means comprise at least one suction box (8, 9).
  12. A device for manufacturing gypsum plasterboards according to one of Claims 7 to 10, characterised in that the suction means comprise at least one suction roller (20, 21).
  13. A device for manufacturing gypsum plasterboards according to one of Claims 7 to 12, characterised in that the negative pressure of the suction means is adjustable.
EP02767350A 2001-08-17 2002-08-09 Method and device for producing gypsum plasterboards Expired - Lifetime EP1420926B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10139420 2001-08-17
DE10139420A DE10139420B4 (en) 2001-08-17 2001-08-17 Method and device for producing plasterboard
PCT/EP2002/008899 WO2003016010A1 (en) 2001-08-17 2002-08-09 Method and device for producing gypsum plasterboards

Publications (2)

Publication Number Publication Date
EP1420926A1 EP1420926A1 (en) 2004-05-26
EP1420926B1 true EP1420926B1 (en) 2006-07-05

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Application Number Title Priority Date Filing Date
EP02767350A Expired - Lifetime EP1420926B1 (en) 2001-08-17 2002-08-09 Method and device for producing gypsum plasterboards

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US (1) US20050155689A1 (en)
EP (1) EP1420926B1 (en)
AT (1) ATE332221T1 (en)
CA (1) CA2462520A1 (en)
DE (2) DE10139420B4 (en)
WO (1) WO2003016010A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7513768B2 (en) 2003-09-18 2009-04-07 United States Gypsum Company Embedment roll device
US7670520B2 (en) * 2003-09-18 2010-03-02 United States Gypsum Company Multi-layer process for producing high strength fiber-reinforced structural cementitious panels with enhanced fiber content
US7445738B2 (en) * 2003-09-18 2008-11-04 United States Gypsum Company Multi-layer process and apparatus for producing high strength fiber-reinforced structural cementitious panels
US20080099133A1 (en) 2006-11-01 2008-05-01 United States Gypsum Company Panel smoothing process and apparatus for forming a smooth continuous surface on fiber-reinforced structural cement panels
US7524386B2 (en) * 2006-11-01 2009-04-28 United States Gypsum Company Method for wet mixing cementitious slurry for fiber-reinforced structural cement panels
US7754052B2 (en) 2006-11-01 2010-07-13 United States Gypsum Company Process and apparatus for feeding cementitious slurry for fiber-reinforced structural cement panels
US7513963B2 (en) * 2006-11-01 2009-04-07 United States Gypsum Company Method for wet mixing cementitious slurry for fiber-reinforced structural cement panels
DK2694283T3 (en) 2011-04-01 2017-05-01 Knauf Gips Kg Cardboard with optimized plaster core stitching

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1584781A (en) * 1925-04-11 1926-05-18 Langworthy Mitchell Portable fracture bed
GB741140A (en) * 1952-10-16 1955-11-30 British Plaster Board Holdings Improvements in and relating to the production of plaster board
US3260635A (en) * 1963-08-22 1966-07-12 United States Gypsum Co Production of ribbed building board
CA2146277C (en) * 1994-05-25 2002-03-26 John L. Phillips Apparatus and method for manufacturing gypsum board
CA2242746C (en) * 1998-07-08 2002-06-11 Westroc Inc. Gypsum board manufacture with co-rotating spreader roller
US6475313B1 (en) * 2000-09-20 2002-11-05 United States Gypsum Company Process for making gypsum board having improved through-penetration strength

Also Published As

Publication number Publication date
EP1420926A1 (en) 2004-05-26
ATE332221T1 (en) 2006-07-15
US20050155689A1 (en) 2005-07-21
CA2462520A1 (en) 2003-02-27
WO2003016010A1 (en) 2003-02-27
DE50207446D1 (en) 2006-08-17
DE10139420A1 (en) 2003-03-06
DE10139420B4 (en) 2006-07-27

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