EP0702116B1 - Méthode de production d'une plaque de plâtre recouvert d'une feuille en fibre de verre revêtu - Google Patents

Méthode de production d'une plaque de plâtre recouvert d'une feuille en fibre de verre revêtu Download PDF

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Publication number
EP0702116B1
EP0702116B1 EP95114351A EP95114351A EP0702116B1 EP 0702116 B1 EP0702116 B1 EP 0702116B1 EP 95114351 A EP95114351 A EP 95114351A EP 95114351 A EP95114351 A EP 95114351A EP 0702116 B1 EP0702116 B1 EP 0702116B1
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EP
European Patent Office
Prior art keywords
mass
coating
core
calcium sulphate
coating mass
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Expired - Lifetime
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EP95114351A
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German (de)
English (en)
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EP0702116A1 (fr
Inventor
Jürgen MARTIN
Anton Dipl. Ing. Peter
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Knauf Gips KG
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Gebr Knauf Westdeutsche Gipswerke
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Priority claimed from DE19527858A external-priority patent/DE19527858C2/de
Application filed by Gebr Knauf Westdeutsche Gipswerke filed Critical Gebr Knauf Westdeutsche Gipswerke
Publication of EP0702116A1 publication Critical patent/EP0702116A1/fr
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/043—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of plaster
    • 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
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/0006—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects the reinforcement consisting of aligned, non-metal reinforcing elements

Definitions

  • the invention relates to a method for producing a coated glass fleece laminated plasterboard, in which a sheet of coated glass mat is provided which of a glass fleece and a dry coating compound is formed, which forms a coating and in the glass fleece has penetrated, and in which the horizontally moving Web of coated glass fleece on the uncoated Side with a strand of gypsum core material that can be set is provided, which penetrates into the glass fleece and forms a plate core capable of setting on the glass fleece, the plasterable gypsum core mass penetrating into the glass fleece a set pulp consistency when running onto the track and the coated glass fleece two in forms edge strips lying on the web plane and being on the gypsum building board produce the coating including the glass fleece layer the plate core at any point across the plate level a lifting strength measured at right angles to the plate level is held.
  • a plasterboard is produced which is in an unprocessed state and the coating composition a specific setting behavior is assigned.
  • a method of this type is known with the exception (DE-A-20 08 744) that the coated glass fleece from a Glass fleece and a peelable paper coating formed is. But it is also known (DE-A-39 37 433) in the manufacture a coated glass fleece of plasterboard to be provided by a glass fleece and a dry coating compound is formed, e.g. a plaster coating forms and has penetrated into the glass fleece.
  • the after this Process made plasterboard is advantageous because one subsequent filling of the surface of the plasterboard is eliminated and this surface of the finished plasterboard directly with emulsion paint, wallpaper, tiles or Records can be occupied.
  • This is advantageous with the glass fleece coated with dry coating compound Cover with the strand of gypsum core material that can be set dry and can not the production plant by gypsum core mass soiling because there is no such through the glass fleece Gypsum core mass can penetrate.
  • a lifting strength of 0.1 N / mm 2 is not sufficient for the practical use of the gypsum building board.
  • delamination or internal splitting occurs in the glass fleece layer, which is a considerable disadvantage particularly when applying heavy coatings such as heavy paper or textile wallpaper or ceramic tiles.
  • the method according to the invention is solving this problem, characterized in that the pulp consistency of the gypsum core composition capable of setting is set to a spreading diameter of at least 240 mm and at most 320 mm, the spreading diameter being that of a gypsum core mass pile which is composed of a larger diameter of 101 mm, a height of 80 mm and a smaller diameter of 80 mm having a truncated cone of pliable gypsum core made of natural gypsum after a case over 200 mm or from REA gypsum after a case over 125 mm, the case 15 sec after emergence on the Web takes place, and that on the coated glass fleece provided with the strand of gypsum core material capable of setting, at at least two vibr
  • the desired lifting strength of at least 0.15 N / mm 2 is also generated in the edge strips, for which purpose special measures are provided.
  • the plasterboard produced according to the invention has very good edge strength. By shaking across the entire width of the web plane, the edges are in many cases sufficiently well developed and the desired lifting strength is also achieved in the edge strips.
  • a favorable embodiment is present if the strand of gypsum core composition capable of setting is applied by bringing porridge onto the web from a main mixer via a central outlet and bringing porridge onto the web from an edge mixer via a lateral outlet in the area of the two edge strips.
  • the addition of mass or porridge placed on the edge strips causes the gypsum core mass to be introduced into the glass fleece in the region of the edge strips even in the first transverse vibrator to the extent that the lifting strength of at least 0.15 N / mm 2 is achieved.
  • the gypsum board manufacturing plant has one in this case Molding station consisting of a main mixer and an edge mixer consists.
  • the main mixer e.g. from stucco, Water, foaming agents and additives made of paste-like gypsum paste, from a central spout to that of the coated one Glass fleece formed web flows.
  • Part of the gypsum paste will branched off directly from the main mixer and the edge mixer fed. In this the foam is largely broken up.
  • the edge gypsum slurry modified in this way has a higher one Bulk density and higher strength than the gypsum paste from the Main mixer. It is directly in through thin outlet hoses directed the edge areas of the edge strips, their width is about 6-12 cm.
  • Another favorable embodiment is when the strand of gypsum core material capable of setting is covered from above with an upper web of coated glass fleece, which is formed by a glass fleece and a dry coating mass, which forms a coating and has penetrated into the glass fleece, and that at least one upper jogging point is shaken across the web plane of the upper glass fleece.
  • an upper coated glass fleece that it holds together with the remaining gypsum building board at any point across the board level with a lifting strength of at least 0.15 N / mm 2 measured at right angles to the board level. In this respect, no special measures are necessary for the edge strips.
  • At the at least two lower transverse vibrating points e.g. two separate rod-like cross vibrators are available or a single, common, table-like, elongated cross vibrator.
  • the upper vibrating point can also be of a rod-like type or a table-like elongated cross vibrator his.
  • the shaking can be done by rotating polygonal iron cause a vibration on the coated glass mat exercise or by a vibrating plate.
  • a particularly useful and advantageous embodiment the invention is present when on the web of coated Glass fleece on its underside across the web of air from the area of the glass fleece free of coating compound is suctioned off. It is due to the porous coating mass sucked air out of the pores of the glass fleece, so that the gypsum core mass can penetrate better.
  • the web has coated glass fleece the overhanging overhanging areas, which then to the edge strips by means of a guide rail to be folded up by an articulation angle to an undesired lateral discharge of the relatively liquid To prevent gypsum core mass.
  • the kink angle in the area of Shaking is e.g. 30 °.
  • Particularly useful and advantageous it is when the web of coated glass fleece forms overhanging overhanging areas, which are then attached to the edge strips by means of a guide rail can be folded up by a kink angle, and when folding up in the area of the lower, transversely extending Vibrations at 90 °. In this way can the gypsum core mass in the area of the edge strips Do not remove the effect of the shaking, e.g. by Not can overflow the folded envelope areas.
  • the core mass and the coating mass in the Glass fleece layer almost all over.
  • the interface between the core mass area and the coating mass area is partially formed from nonwoven fibers, so that in these Parts of the surface touch the core mass and coating mass cannot take place.
  • the plaster body of the core through the usual addition of air entraining agents and by evaporating the excess mixing water porous during drying. So it is unhelpful, the extent of contact between nuclear mass and coating mass by portions of a separating surface between core mass area and coating mass area specify. The extent of the touch is therefore described by the lifting strength.
  • the core mass is brought into contact with the coating mass in such a way that the internal strength of the system, expressed by the lifting strength, is at least 0.15 N / mm 2 at every point. It is particularly expedient and advantageous if the pulp consistency is set and shaken in such a way that there is an average lifting strength of at least 0.2 N / mm 2 . With these limit values of the lifting resistance, the invention has proven itself particularly well in practice.
  • the setting core material consists of calcium sulfate hemihydrate, Water, additives and plasticizers.
  • the setting the consistency of the gypsum paste is e.g. by variation the water-gypsum ratio and / or by addition of condensers, retarders and / or accelerators.
  • the Porridge consistency provided in the method according to the invention is not due to the intended measuring method or through the specified dimension "propagation diameter" limited, but can also according to others Measurement methods are determined or by other design parameters are reproduced. It is important that it is here about the pulp consistency of those just put on the train Gypsum core mass acts and that the design size within a certain maximum time after removal the gypsum core mass to be examined is determined.
  • the method according to the invention can be used with all carry out suitable coating compositions, e.g. in DE-A-39 37 433 are specified.
  • the method according to the invention is for plasterboard Glass fiber abrasion at processing points almost completely avoided.
  • the coating composition is tough and firm and does not give any non-woven fibers free. Since the core mass is almost continuous with the coating material is in contact, there is no more non-woven fibers that are not covered by mass.
  • the new plasterboard makes the surface practically non-abrasive also for the cladding of ventilation shafts and Cable channels is suitable.
  • the extent of penetration the glass fleece layer with core mass or the creation of core mass of coating composition can be improved Specify lifting resistance at every point of the plaster coating.
  • the present plasterboard has excellent Coating properties, so too heavy coating materials a solid and durable Coming together with the plate without previous Filling or other elaborate treatment of the Surface would be required.
  • the core mass in the Glass fleece layer is penetrated so deeply into the glass fleece layer that the desired continuous contact of coating material and core mass is given. This is also an improvement in the lifting resistance by reduction the risk of splitting the glass fleece layer. It is a technique known per se (GB-A-2 053 779), a To produce plasterboard so that the core mass in the Glass fleece layer has penetrated more or less. at The gypsum board produced according to the invention is the core mass in the Glass fleece layer penetrated so far that it in continuous Contact with the previously penetrated Coating has come.
  • the bond quality is particularly increased in that the Calcium sulfate of the coating composition as a nucleating agent for the Gypsum formation of the core mass is used. This creates the Connection point between core mass and coating directional growth of a plaster layer, which extremely improves adhesion works (epitaxy).
  • the slow setting speed is within the scope of the invention usually given when the coating material is on the start of stiffening according to DIN 1168 is at least 1.5 hours and a maximum of 6 hours. Especially It is expedient and advantageous if the stiffening begins the coating mass at least 2.5 hours and / or is a maximum of 5 hours. Proven in this setting time range the invention is particularly good in practice.
  • the calcium sulfate of the gypsum board not yet processed is not or almost not set; the Degree of rehydration of the coating mass is ⁇ 5%, i.e. that a maximum of 5% of what was initially planned when switching on Calcium sulfate converted to calcium sulfate dihydrate to have. As a rule, however, the calcium sulfate is the coating material up to a maximum degree of rehydration 2% not tied.
  • the core mass is brought into contact with the coating mass in such a way that the internal strength of the system, expressed by the lifting strength, is at least 0.15 N / mm 2 at every point. It is particularly expedient and advantageous if there is an average lifting strength of at least 0.20 N / mm 2 .
  • the plate according to the invention proves particularly well in practice at this limit value of the lifting resistance.
  • the coating composition Calcium sulfate is hemihydrate and additives contains a slow setting speed of the calcium sulfate hemihydrate cause.
  • calcium sulfate hemihydrate is achieved by adding the additives, that the coating mass of the plasterboard is not or is almost not set.
  • the calcium sulfate hemihydrate is more effective Stucco.
  • additives in the form of retarders include e.g. Citric acid and protein hydrolyzates.
  • the coating composition when switching on, regardless of what is added Water has the following composition: 60-95 % By weight stucco, 0.01-1% by weight cellulose ether, 0.03-0.5 % By weight retarder, 0.05-1.0% by weight of condenser.
  • the coating composition up to 25% by weight limestone powder and / or up to 5% by weight PVAC dispersion contains. With such a coating compound the fleece fibers in the plate are kept particularly well and the glass fiber abrasion resistance is particularly good.
  • the Limestone flour is a filler.
  • the condenser is e.g. lignin sulfonate, a naphthalene sulfonic acid condensation product or a melamine resin.
  • a particularly expedient and advantageous embodiment of the invention further consists in the calcium sulfate being a calcium sulfate anhydrite which is fine-grained with a grain size of ⁇ 200 ⁇ m, preferably ⁇ 63 ⁇ m and is partially capable of setting.
  • this special anhydrite can be provided as a plaster coating on the glass fleece layer.
  • This anhydrite has an advantageous ability to penetrate the fleece surface and forms an optimal bond with the binder and fleece.
  • the anhydrite generally has a mean particle size of d 50 between 8 and 12 ⁇ m.
  • the coating mass when starting, regardless of added water has the following composition: At least 94% by weight calcium sulfate anhydrite, 0.01-0.8 % By weight cellulose ether, 0.01-1.0% by weight plasticizer and maximum 02% wetting agent.
  • the Coating composition contains a plasticizer.
  • the plasticizer is only in small quantities, e.g. maximum 5% by weight available and e.g. a polyacrylate or a styrene / butadiene.
  • the plasticizer makes the coating compound plastic and flexible, which is their ability to make the fibers permanent and firm to envelop, improved.
  • the organic binder which in the present case in the Coating mass is provided, e.g. Polyacrylate or Styrene acrylate.
  • Organic binders deteriorate in the Rule the fire behavior and increase the toxicity of the resulting Smoke gases in the event of a fire.
  • the proportion of binder can be relatively low being held. Particularly useful and advantageous so it is when the organic binder is less than 6 Makes up% of the dry coating mass. The not or almost not set, but still reactive Calcium sulfate of the coating composition therefore enables one Reduction in the proportion of organic binders.
  • the coating composition up to 40% by weight aluminum hydroxide or boric acid added. This ensures that the Plasterboard meets the criteria for building material class A1 according to DIN 4102 fulfilled.
  • the abrasion resistance is determined on the basis of this to DIN 53109, "Testing of paper and cardboard: determination of abrasion using the friction wheel method "and ISO 4586-2 "Abration resistance of decorative laminated sheets”.
  • abrasion device is used by the Teldyne Taber Standard Abrasion Tester.
  • the standardized emery paper S-33 is placed on the friction wheels applied.
  • Each friction wheel comes with an additional weight loaded by 500 g.
  • the friction wheels are left during the test with the emery paper S-33 for 10 turns on the Act on the surface of the plate. After that the abrasion is through Determination of the weight difference determined.
  • Another advantage of the gypsum building board produced according to the invention is that the resistance to lifting off is increased after further surface treatment (primer, paint, wallpaper or plaster).
  • Plates of a manufacture according to the invention have an average lifting strength of 0.34 N / mm 2 after production, the minimum value from six measurements across the plate width being 0.23 N / mm 2 .
  • Part of the boards is coated with an aqueous dispersion primer, the other part is coated with a thin plaster based on gypsum.
  • the average lifting strength reaches 0.42 N / mm 2 after priming and 0.43 N / mm 2 after thin-plaster application: the minimum values increase to 0.24 and 0.28 N / mm 2 .
  • the coating composition based on calcium sulfate comprises when dressing as an inorganic binder either only hemihydrate or only anhydrite.
  • the core mass is composed as is discussed for plasterboard here standing type is common and as with conventional plasterboard is used.
  • the gypsum board produced according to the invention is used on conventional production lines for plasterboard manufactured.
  • the plasterboard is behind their manufacture in the unprocessed state when stored and / or transported and / or mechanically fastened becomes. A processed state exists when the plasterboard is built into a building. If the coating mass with the built-in plasterboard with wallpaper, Tiles or foils is covered, it absorbs water and the calcium sulfate can partially rehydrate.
  • the plasterboard according to Figures 1 and 2 has a board core 1, on the one side of which there is a glass fleece layer 2 connects to the outside with a calcium sulfate coating 3 is provided.
  • the glass fleece layer 2 is in two layer-like regions 4, 5, one region 4 is filled with a coating compound, which is also the coating 3 forms, and the other area 5 with a core mass is filled, which also forms the plate core 1.
  • the core mass and the coating mass touch each other the glass fleece layer 2 along a separating surface 6.
  • the intimate contact between the core mass and the coating mass can be determined using scanning electron microscopy Show recordings.
  • Fig. 9 shows the perfect contact both layers that penetrated the glass fleece layer are.
  • underlying plate is the stucco added iron oxide before mixing.
  • the electron beam microsensor With the help of the electron beam microsensor how far the core mass is determined has penetrated the glass fleece. How to get out of the Can recognize spectra, is the core mass up to that with "2" point penetrated. The digit "1" shows no iron peak. Because such analyzes in practice too are elaborate, the degree of contact is affected by the Lift resistance described.
  • the calcium sulfate coating 3 is as thin as a film and maximum 200 ⁇ m thick. You can see the structure of the fleece recognize through the coating 3, because this like a thin spread on the fleece.
  • a roll 10 is used as a Web of a coated glass fleece 11 drawn over a mold plate 12 is moved. From a mixer 13 placed 11 gypsum core mass on the coated glass fleece, which forms a plate core 14 capable of setting and also in the coated glass fleece 11 penetrates. About the width of the Form plate 12 extend three cross vibrators 15, 16, 17 that Attack the coated glass fleece 11 from below.
  • edge vibrators 18 provided on the two edge strips 19 of the coated glass fleece 11 from attack below.
  • Fig. 5 and 6 illustrate how the mixer 13 over several Outlets 20 of the gypsum paste on the coated lower glass fleece 11 is brought. They are the joggers in a row 16, 17, 18 are provided, which are assigned a suction direction 21 that is across the coated glass mat 11th extends. The pair of edge vibrators 18 is provided, which are each assigned a drive 22. The joggers follows a molding table 23, in front of an upper, coated Glass fleece 24 is supplied and placed on the gypsum core mass becomes. The shaping table 23 is followed by two smoothing rails 25 provided.
  • edge strips 26 are 24 gypsum core mass on the coated glass mat applied and also in the area of edge strips 26.
  • the edge strips 26 go over a kink angle 27 90 ° in envelope areas 28 over. This is by means of right angle Guide rail 29 reaches the handling areas fold up while the coated glass fleece 11 moves on.
  • the device according to FIG. 8 has a base plate 30 on which a glass plate 31 lies and a stand 32 stands at the edge.
  • the stand 32 carries a truncated cone-shaped arm Container 33 which is down from a closing glass plate 34 is shut off, which is via a swivel arm on the stand 32 is stored.
  • the gypsum pulp to be examined is at the outlet from the mixer spouts 20 or when running onto the Web removed, filled into the container 33 and above with with a knife or spatula.
  • the greased one Lock glass plate 34 is 15 sec after the removal of the Gypsum paste swung out quickly at the mixer spouts, see above that the gypsum slurry from the container 33 on the glass plate 31st falls down.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (25)

  1. Procédé de production d'une plaque de construction en plâtre recouverte d'une nappe de fibres de verre revêtue, dans lequel on prévoit une bande de nappe de fibres de verre revêtue (11) qui est formée par une nappe de fibres de verre et par une masse de revêtement sèche qui forme un revêtement et qui a pénétré dans la nappe de fibres de verre, et dans lequel la bande, continuant à se déplacer horizontalement, de la nappe de fibres de verre revêtue est pourvue, sur le côté non revêtu, d'un cordon de masse formant noyau de plâtre susceptible de durcir qui pénètre dans la nappe de fibres de verre et qui forme un noyau de plaque (14) susceptible de durcir sur la nappe de fibres de verre, dans lequel la masse formant noyau de plâtre pénétrant dans la nappe de fibres de verre et durcissable présente une consistance pâteuse adaptée lors de la déposition sur la bande, et la nappe de fibres de verre revêtue (11) forme deux rubans marginaux (26) situés dans le plan de la bande, et le revêtement sur la plaque de construction en plâtre finie, y compris la couche de nappe en fibres de verre sur le noyau de plaque, est retenu à chaque emplacement sur le plan de plaque avec une résistance anti-soulèvement mesurée à angle droit par rapport au plan de plaque, caractérisé en ce que la consistance pâteuse de la masse formant noyau de plâtre durcissable est adaptée à un diamètre de propagation de 240 mm au minimum et de 320 mm au maximum, le diamètre de propagation étant celui d'un tas de masse formant noyau de plâtre qui résulte à partir d'un tronc de cône d'un grand diamètre de 101 mm, d'une hauteur de 80 mm et d'un petit diamètre de 80 mm de la masse formant noyau de plâtre durcissable en plâtre naturel après une chute sur 200 mm ou en plâtre de désulfuration de gaz de fumées après une chute sur 125 mm, la chute ayant lieu 15 secondes après la déposition sur la bande, et en ce que sur la nappe de fibres de verre revêtue (11) pourvue du cordon de masse formant noyau de plâtre durcissable, on applique des secousses à au moins deux emplacements d'application (16, 17) écartés l'un de l'autre en direction de poursuite de mouvement, perpendiculairement au plan de bande de la nappe jusqu'à atteindre une venue en contact de la masse formant noyau et de la masse de revêtement, et tout cela de telle sorte que la résistance anti-soulèvement de la plaque de construction en plâtre finie s'élève à au moins 0,15 N/mm2.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on dépose le cordon de masse formant noyau durcissable en déposant de la pâte sur la bande par un mélangeur principal via une sortie centrale et en déposant de la pâte au niveau des deux rubans marginaux par un mélangeur latéral via une sortie latérale respective.
  3. Procédé selon l'une ou l'autre des revendications précédentes, caractérisé en ce que l'on applique des secousses à un emplacement d'application suivant (18) en supplément sur les deux rubans marginaux (26) de la nappe revêtue (11) situés dans le plan de la nappe.
  4. Procédé selon l'une quelconques des revendications 1, 2 et 3, caractérisé en ce que l'on recouvre le cordon de masse formant noyau de plâtre durcissable depuis le haut avec une bande supérieure de nappe de fibres de verre revêtue (24) qui est formée par une nappe de fibres de verre et par une masse de revêtement sèche qui forme un revêtement et qui a pénétré dans la nappe de fibres de verre, et en ce que l'on applique des secousses à au moins un emplacement d'application supérieur perpendiculairement au-dessus du plan de bande de la nappe de fibres de verre supérieure.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que sur la bande de la nappe de fibres de verre revêtue (11), sur sa face inférieure, on aspire de l'air perpendiculairement au-dessus de la bande hors de la zone, dépourvue de masse de revêtement, de la nappe de fibres de verre.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de la nappe de fibres de verre revêtue (11) forme des zones de rabattement (28) dépassant au-delà des rubans marginaux (26) que l'on rabat ensuite au niveau du ruban marginal vers le haut sur un angle de pliage (27) au moyen d'un rail de guidage (29), et en ce que le rabattement vers le haut au niveau des emplacements d'application de secousses inférieurs transversaux s'effectue sur 90°.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la consistance pâteuse est adaptée et secouée de telle manière qu'on obtient une résistance anti-soulèvement moyenne d'au moins 0,2 N/mm2.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on réalise une plaque de construction en plâtre comportant une couche de nappe de fibres de verre revêtue, dans laquelle au moins un côté d'un noyau de plaque (1) est recouvert de la couche de nappe de fibres de verre (2) dont le côté détourné du noyau de plaque est pourvu d'un revêtement (3) de sulfate de calcium, dans laquelle la masse de noyau forme le noyau de plaque et a pénétré d'une part dans la couche de nappe de fibres de verre et dans laquelle la masse de revêtement forme le revêtement de sulfate de calcium et a pénétré d'autre part dans la couche de nappe de fibres de verre, et dans laquelle la masse de revêtement est formée à base d'un sulfate de calcium et contient un liant organique, et dans laquelle la masse formant noyau est formée par du dihydrate de sulfate de calcium, le revêtement de sulfate de calcium (3) y compris la couche de nappe de fibres de verre (2) adhère au noyau de plaque (1) à chaque emplacement sur le plan de plaque avec une résistance anti-soulèvement mesurée à angle droit par rapport au plan de plaque, et dans laquelle on prévoit, dans l'état qui se présente peu après la fabrication, que le sulfate de calcium de la masse de revêtement n'a pas pris ou pratiquement pas pris, et que la masse de noyau est amenée en contact pratiquement sur toute la surface en continu avec la masse de revêtement, de telle sorte que la résistance anti-soulèvement s'élève à au moins 0,15 N/mm2.
  9. Procédé selon la revendication 8, caractérisé en ce que le début de la solidification de la masse de revêtement dure au moins 1,5 heures.
  10. Procédé selon l'une ou l'autre des revendications 8 et 9, caractérisé en ce que le début de la solidification de la masse de revêtement dure au moins 2,5 heures.
  11. Procédé selon l'une quelconque des revendications 8, 9 et 10, caractérisé en ce que le début de la solidification de la masse de revêtement dure au maximum 6 heures.
  12. Procédé selon l'une quelconque des revendications 8 à 11, caractérisé en ce que le début de la solidification de la masse de revêtement dure au maximum 5 heures.
  13. Procédé selon l'une quelconque des revendications 8 à 12, caractérisé en ce que l'on obtient une résistance anti-soulèvement moyenne d'au moins 0,20 N/mm2.
  14. Procédé selon l'une quelconque des revendications 8 à 13, caractérisé en ce que le sulfate de calcium de la masse de revêtement est un semi-hydrate de sulfate de calcium qui contient des additifs qui provoquent un ralentissement de la vitesse de prise du semi-hydrate de sulfate de calcium.
  15. Procédé selon la revendication 14, caractérisé en ce que lors du gâchage, la masse de revêtement présente la composition suivante, indépendamment de l'eau ajoutée : 60 à 95 % en poids de fleur de plâtre, 0,01 à 1 % en poids d'éther cellulosique, 0,03 à 0,5 % en poids de retardateur, 0,05 à 1,0 % en poids de liquéfacteur.
  16. Procédé selon l'une ou l'autre des revendications 14 et 15, caractérisé en ce que la masse de revêtement contient jusqu'à 25 % en poids de calcaire en poudre et/ou jusqu'à 5 % en poids d'acétate de polyvinyle en dispersion.
  17. Procédé selon l'une quelconque des revendications 8 à 13, caractérisé en ce que le sulfate de calcium est un anhydride de sulfate de calcium à grains fins avec une taille de grains < 200 µm et partiellement durcissable.
  18. Procédé selon la revendication 17, caractérisé en ce que la taille de grain de l'anhydride de sulfate de calcium est < 63 µm.
  19. Procédé selon l'une ou l'autre des revendications 17 et 18, caractérisé en ce que la masse de revêtement de l'anhydride de sulfate de calcium présente une valeur granulométrique moyenne d50 entre 8 et 12 µm.
  20. Procédé selon l'une quelconque des revendications 17 à 19, caractérisé en ce que lors du gâchage, la masse de revêtement présente la composition suivante, indépendamment de l'eau ajoutée : au moins 94 % en poids d'anhydride de sulfate de calcium, 0,01 à 0,8 % en poids d'éther cellulosique, 0,01 à 1,0 % en poids de liquéfacteur et au maximum 0,2 % en poids d'agent mouillant.
  21. Procédé selon la revendication 8, caractérisé en ce que le sulfate de calcium de la masse de revêtement n'a pas pris, exception faite d'un taux de réhydratation de 2 % au maximum.
  22. Procédé selon l'une quelconque des revendications 8 à 21, caractérisé en ce que la masse de revêtement contient un plastifiant.
  23. Procédé selon l'une quelconque des revendications 8 à 22, caractérisé en ce que l'abrasion de la masse de revêtement, mesurée au moyen du testeur d'abrasion "Teledyne Taber Standard" suivant les normes ISO 4586-2 et DIN 53109, s'élève à 0,2 g au maximum.
  24. Procédé selon l'une quelconque des revendications 8 à 23, caractérisé en ce que le liant organique représente moins de 6 % en poids de la masse de revêtement sèche.
  25. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la masse de revêtement contient jusqu'à 40 % en poids d'hydroxyde d'aluminium ou d'acide borique.
EP95114351A 1994-09-15 1995-09-13 Méthode de production d'une plaque de plâtre recouvert d'une feuille en fibre de verre revêtu Expired - Lifetime EP0702116B1 (fr)

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Application Number Priority Date Filing Date Title
DE4432791 1994-09-15
DE4432791 1994-09-15
DE19527858 1995-07-29
DE19527858A DE19527858C2 (de) 1994-09-15 1995-07-29 Verfahren zur Herstellung einer mit beschichtetem Glasvlies kaschierten Gipsbauplatte

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EP0702116A1 EP0702116A1 (fr) 1996-03-20
EP0702116B1 true EP0702116B1 (fr) 2002-01-09

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ES (1) ES2167395T3 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7745357B2 (en) 2004-03-12 2010-06-29 Georgia-Pacific Gypsum Llc Use of pre-coated mat for preparing gypsum board
CN104929305B (zh) * 2015-07-12 2017-05-24 禄春雄 一种防震隔音保温轻质隔墙板及其制作方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1033123B (de) * 1954-06-23 1958-06-26 Saint Gobain Gipsplatte sowie Verfahren und Vorrichtung zu deren Herstellung
US3993822A (en) * 1970-02-25 1976-11-23 Gebr. Knauf Westdeutsche Gipswerke Multi-layer plasterboard
AU5170773A (en) * 1972-02-02 1974-08-01 Commw Sceitnific And Ind Resea Plaster sheet material
US4450022A (en) * 1982-06-01 1984-05-22 United States Gypsum Company Method and apparatus for making reinforced cement board

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EP0702116A1 (fr) 1996-03-20
ATE211790T1 (de) 2002-01-15
ES2167395T3 (es) 2002-05-16

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