EP1389157B1 - Procede et dispositif pour la formation de couches denses dans une plaque de platre - Google Patents

Procede et dispositif pour la formation de couches denses dans une plaque de platre Download PDF

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Publication number
EP1389157B1
EP1389157B1 EP02738232A EP02738232A EP1389157B1 EP 1389157 B1 EP1389157 B1 EP 1389157B1 EP 02738232 A EP02738232 A EP 02738232A EP 02738232 A EP02738232 A EP 02738232A EP 1389157 B1 EP1389157 B1 EP 1389157B1
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EP
European Patent Office
Prior art keywords
surface layer
crude
forming
facing
mixer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02738232A
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German (de)
English (en)
French (fr)
Other versions
EP1389157A1 (fr
Inventor
Bruno Callais
Paul Jallon
Jean-Louis Laurent
Michel Rigaudon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Etex France Building Performance SA
Original Assignee
Lafarge Platres SA
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Publication date
Application filed by Lafarge Platres SA filed Critical Lafarge Platres SA
Publication of EP1389157A1 publication Critical patent/EP1389157A1/fr
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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
    • B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
    • 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
    • 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
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/02—Conditioning the material prior to shaping
    • B28B17/023—Conditioning gypsum
    • 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
    • B28B19/0015—Machines or methods for applying the material to surfaces to form a permanent layer thereon on multilayered articles

Definitions

  • the present invention relates to a method and a device for manufacturing plasterboard and more particularly for plasterboard having a gypsum core whose density changes as a function of distance from the surface.
  • plasterboard In order to lighten plasterboard, it is known to produce plasterboard having a low density core layer by incorporating foaming agents into the paste. This core layer is surrounded by high density surface layers. Surface plaster layers are bonded to cardboard sheets. The surface layers also have a small volume of gas bubbles. The adhesion of this paste with the cardboard sheet is thus improved. Surface layers also increase the hardness and rigidity of plasterboards.
  • EP-A-0 957 212 discloses a gypsum board manufacturing apparatus comprising a main mixer for forming the core layer and a secondary mixer for forming the surface gypsum layers.
  • EP-A-0 985 504 discloses a fiber plate forming device comprising 3 mixers wherein wet fibers are mixed with calcium sulfate, or water is added thereafter as a spray.
  • the object of the invention is thus to provide a solution to one or more of these problems.
  • the invention thus relates to a method of manufacturing plasterboard comprising the steps of providing hydratable calcium sulfate and water in a first mixer; providing hydratable calcium sulfate and water in a second blender; the preceding supply steps being implemented independently of one another; providing a siding; preparing a first plaster paste in the first mixer; preparing a second plaster paste in the second mixer; applying the first plaster paste to the facing and forming a green surface layer; applying the second plaster paste to the green surface layer and forming a green core layer having a composition different from the green surface layer; the green surface layer having a density higher than the green core layer; preparing a third plaster paste in a third mixer, the hydratable calcium sulfate and the water being supplied independently of the other two mixers; the first and the third plaster paste being made in separate mixers; forming a second green surface layer of density greater than the density of the green core layer; applying the second green surface layer to the green core layer; forming a plasterboard raw; and hydrating and drying the plaster
  • the method further comprises, before the step of forming the second surface layer, a step of providing a second facing; application of the third plaster paste on the second facing.
  • the third plaster paste is applied over the second facing and the method further comprises, after the step of applying the third plaster paste, a step of reversing the second facing.
  • a step of forming a layer comprises an operation for displaying a plaster paste.
  • a green surface layer has a density of between 1.2 and 2 g / cm 3 .
  • the green core layer has a density of between 1 and 1.2 g / cm 3 .
  • a surface layer has a density of between 0.8 and 1.2 g / cm 3 after drying.
  • the core layer has a density of between 0.6 and 1.2 g / cm 3 after drying.
  • the ratio of the density of a surface layer to the density of the core layer is between 1 and 1.5 after drying.
  • a surface layer comprises an amount of starch less than 15 g / m 2 after drying.
  • a surface layer has a thickness of between 0.1 and 0.5 mm after the formation of the plate.
  • a facing made of cardboard or of fiberglass is used.
  • the invention also relates to a device for manufacturing plasterboard, comprising means for supplying a facing; a first mixer for preparing a first plaster paste; means for applying the first plaster paste on the siding; means for forming a green surface layer on the facing; a second mixer for preparing a second plaster paste; said first and second mixers being fed with hydratable calcium sulfate and water independently of one another; means for applying the second plaster paste to the green surface layer; means for forming a green core layer on the green surface layer; a third mixer for preparing a third plaster paste independently of the other two mixers; means for feeding a second facing; means for forming a second green surface layer; means for applying the second green surface layer to the green core layer; siding drive means and green layers; means for forming a plasterboard; and a hydration station and a drying station formed gypsum board.
  • the device further comprises means for applying the third plaster paste over the second facing.
  • the device comprises means for reversing the second facing.
  • the area of application of the first plaster paste, the formation means of the first green surface layer, the area of application of the second plaster paste and the formation means of the core layer in the driving direction, the formation means of the first green surface layer being the most upstream.
  • the distance between a mixer and the corresponding area of application of gypsum paste is less than 1 meter 50.
  • the device comprises a supply circuit of at least hydratable calcium sulfate to the mixers, at least a portion of which is common to the mixers.
  • the device further comprises means for calibrating a layer of green plaster.
  • At least the mixer of the first dough comprises a rotor rotating in a mixing chamber; means for supplying water near the axis of the rotor; a plaster paste outlet communicating with the corresponding plaster paste application means.
  • each mixer has means for supplying water; means for supplying additives; independent means for controlling the flow rate of the means for supplying water or means for supplying additives.
  • the invention notably proposes a manufacturing unit comprising three independent gypsum mixers.
  • a mixer is used to form a green surface layer on a facing, at least one other mixer for forming a green core layer on the surface layer, the green core layer having a composition different from the green surface layer.
  • Figure 1 shows a side view of a manufacturing unit 1 of plasterboard.
  • This unit has three rotor mixers 2, 3 and 4, fed with hydratable calcium sulfate and water through respective inlets 20, 30 and 40, for the preparation of three plaster pastes.
  • Each mixer has a dough outlet, communicating with a respective duct 21, 31 and 41 of application of the dough.
  • a first facing 5 runs on a table 6 disposed under the output of the plaster ducts 21, 31 of the mixers 2, 3.
  • the mixers are placed successively in the direction of travel of the first facing.
  • a high density plaster paste 22 leaves the first mixer, is applied to the first facing and calibrated layer 23 by a roller 24. This layer 23 will be called the first surface layer.
  • a low density plaster paste 32 leaves the second mixer, is applied to the first layer 23 and calibrated layer 33 by a roller 34. This layer 33 will be called the core layer. The median plane of the plasterboard is included in this layer of heart.
  • a high-density paste 42 leaves the third mixer 4, then is applied to a second facing 7. This paste 42 is placed in calibrated layer 43 by a roll 44, then applied to the core layer 33.
  • the assembly formed by the plaster layers and siding passes through a forming station 8.
  • a drywall 9 comes out. This plate 9 is then driven and passes through a hydration station, then through a drying station (not shown).
  • the manufacturing unit 1 of FIG. 1 thus has at least one mixer 2 for preparing a plaster paste intended for the formation of a surface layer 22.
  • This mixer 2 is independent of the second mixer 3 for the preparation of a plaster paste intended for the forming a core layer 32. It is thus possible to create a core layer 33 and a surface layer 23 in a plasterboard, these layers having different physical properties. This advantage will be described more precisely later in the description of the operating method of the manufacturing unit.
  • This manufacturing unit also makes it possible to selectively change the composition of one or both layers of the plasterboard without influencing the characteristics of other layers. For example, it is possible to adapt the composition of a surface layer to the facing on which this layer is reported, by using different mixing rates in the mixers.
  • the flow rate or the amount of an additive in one of the layers is also possible to vary the flow rate or the amount of an additive in one of the layers only. It is for example possible to modify the characteristics of a layer of a plasterboard while continuing to produce continuously. Using multiple mixers allows the use of small mixers. It is also possible to use different gypsum powders in the various mixers. In addition, the size of the application ducts 21, 31 and 41 can thus be reduced by bringing the mixers closer to the table 6. This limits the risk of clogging of the ducts by agglomerates of plaster. Preferably, the mixer outputs will be placed at a distance of less than 1.5 meters from the table 6.
  • the manufacturing unit has drive means of the first facing.
  • This first facing can thus be driven for example by a conveyor belt of a hydration line.
  • This first facing 5 can be scrolled on the flat table 6.
  • the application duct 21 conducts the first plaster paste of the mixer to the facing 5.
  • the paste application duct 21 is situated furthest upstream in the direction of driving of the cladding.
  • the outlet of this duct is disposed above the facing 5 to apply the first dough of the mixer 2 on this facing.
  • the roller 24 is disposed downstream of the outlet of the conduit 21 and makes it possible to form a first surface layer of calibrated thickness, from the first applied plaster paste.
  • a roll is preferably used whose rotational speed and / or distance from the table 6 is adjustable to allow the thickness of the first surface layer to be modified. The roll also makes it possible to distribute the dough over the width of the facing 5.
  • the application duct 31 conducts the second plaster paste of the mixer 3 to the first surface layer 23.
  • the application duct 31 of the second plaster paste is disposed downstream of the roller 24. The exit of this duct is disposed above the facing 5 and the surface layer 23.
  • the roller 34 is disposed downstream of the outlet of the duct 31.
  • the roller has a function of forming the core layer 33 from the second paste, a function for calibrating the thickness of this core layer 33 and a function of distribution and uniformization of the paste of this layer.
  • the vibrating elements 10 make it possible to uniformly distribute the plaster paste over the width of the facing.
  • the quantity of plaster paste applied to form the core layer is generally greater than the quantity of paste used for the surface layers, it is particularly appropriate to have the vibrating elements at the zone of application of the second pulp. plaster.
  • the application conduit 41 conducts the plaster paste of the mixer 4 to the second cladding 7.
  • the outlet of the duct is disposed above the cladding 7.
  • the roll 44 is disposed downstream of the outlet of the duct 41.
  • the roll also has the functions of forming, calibrating, distributing and standardizing the dough and the second surface layer 43.
  • the facings are first driven in substantially opposite directions.
  • the initial driving direction of the facing 7 is opposite to the driving direction of the plasterboard.
  • Free or motorized rollers are used to reverse the driving direction of the facing 7. It can be seen in FIG. 1 that the surface layer 43 is placed vertically and then turned over before being applied to the core layer 33. realizing a third gypsum paste of adequate viscosity, for example by adding additives or by changing the mixing ratio, it is possible to prevent the surface layer 43 from separating from the facing 7 or that this surface layer is disintegrated.
  • the second surface layer 43 is applied against the core layer 33.
  • the assembly formed by the plaster layers and the facings passes through a passage between a forming plate 8 and Table 6. The distance between the forming plate and the table approximately determines the thickness of the gypsum board 9 formed as it passes through the passage.
  • control devices 25, 35, 45 and regulating layers For example, an optical beam can be used to measure the amount of dough at a forming roll. It is thus possible to measure the distance between a sensor and a pile of dough placed upstream of the roller 34. This measurement can then be used to modify the dough flow of the mixer or to modify the quantity of water or foaming agent. introduced in this mixer. The formation of each layer can thus be better controlled. The density of each layer produced thus varies extremely little during the production of drywall.
  • Figure 2 shows a side view of a feeder 11 mixers 2, 3 and 4 hydratable calcium sulfate.
  • Moistable calcium sulphate and optionally solid or liquid additives such as foaming agents or adhesion promoters are introduced through an inlet 12 into a conveyor screw 13.
  • the conveyor screw 13 is driven for example by a motor 14. Introduced products move along the conveyor screw 13.
  • the conveyor screw 13 also makes it possible to mix the calcium sulphate and the various additives.
  • the conveyor screw 13 has along its length two intermediate outlets 15 and 16. These outlets communicate with the inlet of two other conveyor screws 17 and 18. These conveyor screws 17 and 18 bring the products respectively to first and third mixers 2 and 4.
  • the first conveyor screw 13 has at least one other inlet 19 placed downstream relative to the outlets. This inlet 19 makes it possible to introduce additional additives, such as glass fibers or foaming agents.
  • the first conveyor screw 13 has a downstream end which communicates with the inlet 50 of another conveyor screw 51. This conveyor screw 51 brings the initial products and the additional additives to the second mixer 3.
  • This embodiment makes it possible to use a common part of the supply circuit for the three mixers. It also makes it possible to modify the composition of the products according to the mixer in which these products are introduced. Thus, it is possible to insert glass fibers into the second mixer 3 only. This avoids the clogging of the first and third mixers 2 and 4, which generally have smaller dimensions than the second mixer. It is also possible to add foaming agents in the second mixer to reduce the density of the paste that is formed therein.
  • the invention also relates to a dough preparation mixer.
  • a dough preparation mixer is shown schematically in FIGS. 3 and 4.
  • FIG. 4 represents an imaginary section through the main elements of FIG. 3.
  • the mixer has a drive motor 61, a drive shaft. 62, a rotor shaft 64, a transmission belt (63) coupling the shafts 62 and 64 and a rotor 65 integral with the shaft 64.
  • the rotor 65 is for example rotatably mounted in a cylindrical mixing chamber 67.
  • This rotor has for example a disk-shaped flat surface, terminating radially with teeth.
  • the rotor may optionally have ribs 66, extending for example perpendicular to the flat surface, to ensure better mixing of the plaster paste.
  • the mixer has a feed inlet 68 of hydratable calcium sulfate and other products, opening into the mixing chamber. It also has a water inlet 69 opening into the mixing chamber 67.
  • the hydratable calcium sulfate, additives and water are mixed by the rotor 65 to form a homogeneous plaster paste.
  • the feed 69 is made so as to project water at the center of the rotor 65. It is for example introduced into a sleeve 70 overhanging the axis of the rotor. Under the effect of the rotation of the rotor, the introduced water moves on the flat surface of the rotor towards the outside of the mixing chamber and cleans the flat surface. Possible clumps of plaster paste are thus removed from the flat surface. This water also impregnates calcium sulphate and any additives.
  • This feed may for example inject water at the feed duct 68 into calcium sulphate.
  • the mixer also has an outlet 73 disposed in the bottom of the mixing chamber 67. This outlet is disposed radially outwardly of the mixing chamber to evacuate the gypsum pulp centrifuged by the rotation of the rotor.
  • An application duct 72 is disposed at this outlet and makes it possible to apply the plaster paste formed on a facing for example.
  • the mixer optionally comprises a vent 71 opening into the mixing chamber.
  • This vent 71 is placed above the mixing chamber 67. It serves to remove the dust suspended in the mixing chamber.
  • a dust-laden air passes through the vent and is evacuated. It may be possible to inject water into the vent to solubilize the dust and integrate into the plaster paste. The air leaving the vent is thus free of dust.
  • the feed inlet 68 of the hydratable calcium sulfate, the vent 71 and the outlet 73 of the mixing chamber have a preferred relative arrangement. Assuming the rotor rotates clockwise in the example of Fig. 3, the calcium sulphate inlet is disposed at a very small angle after the exit of the chamber. Thus, the plaster and additive powder performs at least one turn in the mixing chamber 67 before being evacuated. The powder can thus be better impregnated with water. Furthermore, the vent 71 is preferably arranged at a low angle before the output of the mixer. The dust generated at the entrance to the powder is thus mainly impregnated in the water before reaching the vent. Because of the distance between the vent and the calcium sulfate feed, the vent thus has a smaller amount of dust to treat.
  • the mixer may also have a self-timer supply opening into the mixing chamber.
  • the mixer may also have a separate feed for possible additives. These power supplies can also be regulated individually. All amounts of additives can thus be controlled directly at the mixer. The dosage of the plaster paste to be formed can thus be very precise.
  • the invention also relates to a method of manufacturing a gypsum board according to the invention. Subsequently, a layer of plaster in which the plug or the hydraulic connection is not completed will be referred to as a layer of green plaster. The plaster layers that have not yet undergone a drying step are thus designated.
  • hydratable calcium sulfate and water are provided in first, second and third mixers 2, 3 and 4.
  • Plaster pastes are then prepared in each of the mixers. These plaster pastes are prepared so as to obtain a paste in the second mixer, whose density is lower than the paste in the first and third mixers.
  • Several parameters make it possible to obtain plaster pastes of different densities. It is thus possible to introduce different amounts of foaming agent, to use different mixing rates or to use different rotational speeds of the mixers or to use different charges.
  • the first plaster paste from the first blender is then applied to the first cladding. This forms a first green surface layer. This layer can be standardized, spread and calibrated as described above.
  • the second gypsum paste from the second mixer is then applied to the first green surface layer.
  • a green core layer with a density lower than the density of the first green surface layer is thus formed.
  • This core layer can also be standardized, spread and calibrated.
  • the third plaster paste from the third mixer is then applied to the second facing.
  • a second green surface layer is thus formed with a density greater than the density of the green core layer.
  • the siding is then turned over and the surface layer formed to apply it to the core layer.
  • the reversal can be carried out by using return rollers 46, which make it possible to deflect the facing 7. These rollers act on the face of the facing opposite the face receiving the third plaster paste. Thus, the layer 43 is not deformed by the rollers 46.
  • These rollers can also be motorized to drive the facing 7.
  • the second green surface layer is then applied to the green core layer.
  • the assembly can then be calibrated as described above.
  • the plasterboard thus formed is then hydrated until the setting of the plaster is obtained.
  • the plate is then dried to remove excess water from the plate.
  • This process thus makes it possible to independently prepare plaster pastes with very different densities. It is then possible to obtain a high density surface layer which promotes adhesion between the surface layer and the facing. It is thus possible to reduce or eliminate the addition of binding additives in the plaster paste intended to form a surface layer. We can then use an amount of starch less than 15 g / m 2 . A high density surface layer is also more resistant to calcination in the dryer. This reduces the risk of producing defective plates. The addition of anti-calcination additives such as tartaric acid can then be reduced or eliminated. A high density surface layer also stiffens the entire plate. Thus, the higher the density of the surface layer, the lower the density of the core layer can be reduced. We can then manufacture lightweight plasterboard.
  • a plaster paste having a density of between 1.2 and 1.6 kg / l in the first and second mixers and then to form surface layers. It is possibly possible to prepare a plaster paste having a density of between 1.6 and 2 kg / l. It is also possible to prepare a plaster paste in the second mixer having a density of between 1 and 1.2 kg / l to then form the core layer.
  • a ratio between the density of the green surface layers and the density of the core layer of between 1.1 and 1.6 is particularly suitable.
  • Such values can be obtained by using for example a mixing ratio of 0.57 in the first and third mixers and a mixing ratio of 0.62 in the second mixer.
  • a ratio between the mixing rates of the dense dough mixers and the less dense dough mixers of between 0.8 and 1.25 is preferably used.
  • the plasterboard obtained after drying is also characterized by the densities of the different layers. Due to evaporation during drying, the final density of the layers is lower than the density of the green layers. Dried surface layer densities of between 0.8 and 1.2 g / cm 3 are thus obtained.
  • the density of the core layer is between 0.6 and 1.2 g / cm 3 .
  • the ratio between the density of the surface layers and the density of the core layer is also preferably between 1 and 1.5 after drying.
  • Tests showed that the bond between layers of different densities was sometimes deteriorated. This can be remedied by adjusting the hydration rates of each of the layers, ensuring that the hydration rate of the core layer is greater than the hydration rates of the surface layers.
  • the formed surface layers preferably have a thickness of between 0.1 and 0.5 mm.
  • a thickness of 0.3 mm is particularly suitable for stiffening the plasterboard and harden one of its faces.
  • the facings are for example made of cardboard.
  • a facing may also be made from glass fibers, for example a glass mat, to provide good fire resistance.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Cosmetics (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP02738232A 2001-05-14 2002-05-10 Procede et dispositif pour la formation de couches denses dans une plaque de platre Expired - Lifetime EP1389157B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0106381A FR2824552B1 (fr) 2001-05-14 2001-05-14 Procede et dispositif pour la formation de couches denses dans un pate de platre
FR0106381 2001-05-14
PCT/FR2002/001587 WO2002092307A1 (fr) 2001-05-14 2002-05-10 Procede et dispositif pour la formation de couches denses dans une pate de platre

Publications (2)

Publication Number Publication Date
EP1389157A1 EP1389157A1 (fr) 2004-02-18
EP1389157B1 true EP1389157B1 (fr) 2007-04-04

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EP02738232A Expired - Lifetime EP1389157B1 (fr) 2001-05-14 2002-05-10 Procede et dispositif pour la formation de couches denses dans une plaque de platre

Country Status (21)

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US (1) US7470338B2 (zh)
EP (1) EP1389157B1 (zh)
JP (1) JP2004528204A (zh)
KR (1) KR20040012830A (zh)
CN (1) CN1221367C (zh)
AR (1) AR033728A1 (zh)
AT (1) ATE358564T1 (zh)
AU (1) AU2002313044B2 (zh)
BR (1) BR0209686A (zh)
CA (1) CA2447561C (zh)
DE (1) DE60219302D1 (zh)
FR (1) FR2824552B1 (zh)
IL (1) IL158757A0 (zh)
MX (1) MXPA03010290A (zh)
NO (1) NO20035090D0 (zh)
NZ (1) NZ529451A (zh)
PL (1) PL199451B1 (zh)
RU (1) RU2265514C2 (zh)
UA (1) UA78703C2 (zh)
WO (1) WO2002092307A1 (zh)
ZA (1) ZA200308762B (zh)

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US9983574B2 (en) * 2013-09-30 2018-05-29 United States Gypsum Company Systems and methods for controlling a conveyor system during product changeovers
CN104723445B (zh) * 2013-12-24 2017-01-25 太仓北新建材有限公司 一种集切边、封边、切断的一体化设备及其运行方法
CN104117326A (zh) * 2014-07-29 2014-10-29 无锡华中科技有限公司 一种沥青放油装置
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EP3854554A1 (en) * 2015-04-14 2021-07-28 Knauf Gips KG A device for the uniform distribution of slurries
US10421250B2 (en) 2015-06-24 2019-09-24 United States Gypsum Company Composite gypsum board and methods related thereto
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DE202015104482U1 (de) * 2015-08-24 2015-10-02 Lindner Ag Decken-, Boden-, Trennwandsysteme Bodenplatte und daraus hergestellter Trockenhohlboden bzw. Doppelboden
US10537863B2 (en) 2015-12-31 2020-01-21 United States Gypsum Company Constrictor valve with webbing, cementitious slurry mixing and dispensing assembly, and method for making cementitious product
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JP2019147387A (ja) * 2019-04-17 2019-09-05 クナウフ ギプス カーゲー 石膏プラスターボードの製造方法およびそれにより得られる石膏プラスターボード
MX2021011802A (es) * 2020-09-28 2022-03-29 Gold Bond Building Products Llc Tablero de yeso hecho usando almidón seco en una zona interfacial entre la suspension espesa de yeso y un material de cubierta.
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CA2447561A1 (en) 2002-11-21
ATE358564T1 (de) 2007-04-15
RU2265514C2 (ru) 2005-12-10
FR2824552A1 (fr) 2002-11-15
IL158757A0 (en) 2004-05-12
UA78703C2 (en) 2007-04-25
CN1221367C (zh) 2005-10-05
MXPA03010290A (es) 2004-05-05
PL199451B1 (pl) 2008-09-30
NO20035090D0 (no) 2003-11-14
AU2002313044B2 (en) 2007-03-22
US7470338B2 (en) 2008-12-30
BR0209686A (pt) 2004-09-14
RU2003136094A (ru) 2005-05-27
CA2447561C (en) 2010-11-02
US20040134585A1 (en) 2004-07-15
AR033728A1 (es) 2004-01-07
CN1509226A (zh) 2004-06-30
DE60219302D1 (de) 2007-05-16
WO2002092307A1 (fr) 2002-11-21
PL367072A1 (en) 2005-02-21
JP2004528204A (ja) 2004-09-16
NZ529451A (en) 2005-12-23
ZA200308762B (en) 2004-07-12
FR2824552B1 (fr) 2004-04-02
KR20040012830A (ko) 2004-02-11
EP1389157A1 (fr) 2004-02-18

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