WO2000059842A1 - Fabrication de plaques de platre et dispositif a cet effet - Google Patents

Fabrication de plaques de platre et dispositif a cet effet Download PDF

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Publication number
WO2000059842A1
WO2000059842A1 PCT/JP1999/001640 JP9901640W WO0059842A1 WO 2000059842 A1 WO2000059842 A1 WO 2000059842A1 JP 9901640 W JP9901640 W JP 9901640W WO 0059842 A1 WO0059842 A1 WO 0059842A1
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WO
WIPO (PCT)
Prior art keywords
gypsum
dried
chips
premixer
raw
Prior art date
Application number
PCT/JP1999/001640
Other languages
English (en)
Japanese (ja)
Inventor
Norifumi Nagata
Sumio Honda
Koichi Kuwayama
Nobuyuki Kimura
Kunio Motoyoshi
Original Assignee
Building Materials Technology Laboratories, K.K.
Onoda Engineering Co., Ltd.
Taiheiyo Cement Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Building Materials Technology Laboratories, K.K., Onoda Engineering Co., Ltd., Taiheiyo Cement Corporation filed Critical Building Materials Technology Laboratories, K.K.
Priority to PCT/JP1999/001640 priority Critical patent/WO2000059842A1/fr
Priority to AU33266/00A priority patent/AU3326600A/en
Priority to PCT/JP2000/001790 priority patent/WO2000059698A1/fr
Publication of WO2000059842A1 publication Critical patent/WO2000059842A1/fr

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Classifications

    • 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
    • B28B19/0092—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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the present invention relates to a gypsum board manufacturing method and a gypsum board manufacturing apparatus. More specifically, the present invention relates to a method and an apparatus capable of stably producing gypsum board with remarkably excellent bending strength and resistance to pulling out screws and nails and various performances with good productivity.
  • Landscape technology a gypsum board manufacturing method and a gypsum board manufacturing apparatus. More specifically, the present invention relates to a method and an apparatus capable of stably producing gypsum board with remarkably excellent bending strength and resistance to pulling out screws and nails and various performances with good productivity.
  • gypsum board widely used as an inorganic interior building material that is inexpensive and has excellent fire resistance
  • a fiber material is mixed with a gypsum material. It is known.
  • a typical example of the fiber material is fiberized pulp.
  • the pulp raw material is fiberized using an impact mill such as a hammer mill, or a wet defibration machine such as pulper, and the gypsum is converted to gypsum. This is done by dispersing in a matrix of the material. This method is effective for reinforcing gypsum board.
  • the defibrated fibers become very bulky, and even if such a bulky fiber and a gypsum material powder are kneaded together with water, a uniform mixture can be efficiently produced. It is technically difficult to get good.
  • the fiberized pulp in the prior art is usually a fine fiber having a length of about 0.1 to 3 mm and a width of about 100 to 100 ⁇ m. Entangled with each other in the slurry, significantly reducing the fluidity of the slurry. Therefore, in a gypsum board production line produced through slurrying of raw materials, usually about 0.1 to 2%, In each case, only about 3% of fibers can be blended. At such a fiber mixing ratio, the properties of the resulting gypsum board, especially the properties such as bending strength and screw and nail pull-out resistance, are not improved as expected, but rather, the separation of materials that occurs during manufacturing. In some cases, this property may be impaired even if fibers are blended.
  • the present inventors have proposed a composite gypsum board and a method for producing the same in WO 96/26166, which solve the above conventional problems.
  • This composite gypsum board mixes paper chips and / or chips with a gypsum material, and the paper chips and / or chips are substantially parallel to a plane perpendicular to the thickness direction of the composite gypsum board. It is oriented.
  • a composite gypsum board is prepared by preparing a raw material slurry containing gypsum material, paper chips and / or chips, water, and various types of filler materials as required, and supplying the slurry onto a movable conveyor. It is manufactured by orienting the paper chips and / or chip bodies contained in the raw material slurry substantially parallel to a plane perpendicular to the thickness direction of the obtained composite gypsum board while moving the conveyor. You.
  • the present inventors have reported that, as WO 96/26616, a composition particularly suitable for gypsum board, the gypsum material is 100 parts by weight of hemihydrate gypsum and 100 to 25 gypsum. A gypsum material composition consisting of 0 parts by weight was also proposed.
  • gypsum board is manufactured using the above-mentioned gypsum material composition
  • gypsum dihydrate that has not been dried usually has a water content of several% to several tens%.
  • the adherence to the passage is so severe that it is difficult to supply a stable supply to the continuous mixer.
  • Figures 17 and 18 show the results using a conventional general gypsum board production line. It is a flowchart for explaining in detail the problem at the time of manufacturing the composite gypsum board.
  • gypsum which has not been dried, is used as the gypsum material.
  • the raw dihydrate gypsum 11 is transferred to a dryer 12, and after drying, is ground by a crusher 13. Subsequently, it is calcined in a calciner 14 to be converted into a hydrate-hardening gypsum, crushed to a desired size by a crusher 15 and temporarily stored in a hemihydrate gypsum silo 16.
  • the kneading water 21, paper chips and / or chips 22 (hereinafter simply referred to as “chips”), and if necessary, additives (agents) 23, are stored in hemihydrate gypsum silos 16. It is introduced into the continuous mixer 31 together with the hemihydrate gypsum. Subsequently, the material kneaded in the continuous mixer 31 is introduced into the casting means 32. In the embodiment shown in FIG. 17, as described above, the chip may not be stably introduced due to the high-speed rotation of the mouth in the continuous mixer 31 at a time.
  • FIG. 18 is a process chart in the case of producing a gypsum board using no gypsum and using the above-mentioned gypsum material composition.
  • the raw dihydrate gypsum 1 1 is dried with a dryer 1 2, pulverized by a pulverizer 13, calcined in a calciner 14, and the obtained hemihydrate gypsum is pulverized by a pulverizer 15 to obtain hemihydrate.
  • the process of temporarily storing in gypsum silo 16 is the same as in Fig. 17.
  • kneading water 21 and, if necessary, additives (agent) 23 are introduced into the continuous mixer 31 together with the hemihydrate gypsum stored in the hemihydrate gypsum silo 16.
  • a part of the gypsum dihydrate 11 is directly transferred to the continuous mixer 31 and kneaded so as to satisfy a predetermined mixing ratio of the composition.
  • the kneaded material is introduced into the casting means 32.
  • the raw dihydrate gypsum adheres to the transfer path toward the continuous mixer 31 and cannot be stably supplied to the continuous mixer 31.
  • an object of the present invention is to provide a method and an apparatus capable of stably producing a gypsum board with remarkably excellent bending strength and resistance to pulling out screws and nails and various performances with good productivity. It is in. Disclosure of the invention According to the present invention, at least one gypsum selected from the group consisting of fresh gypsum, dried gypsum and hydration-hardening gypsum, and paper chips and / or chip bodies are kneaded in a premixer.
  • a premixing step a step of kneading a raw material containing the obtained kneaded material, water and, as necessary, various additives (agents) in a continuous mixer to prepare a raw material slurry, and pouring and forming the raw material slurry.
  • a method for producing a gypsum board comprising: The raw material slurry contains hydration-hardening gypsum as an essential component.
  • the premixing step comprises kneading a raw gypsum or a dried gypsum, a gypsum having hydration curability, and a paper chip and / or a chip body in a premixer.
  • a method for producing a gypsum board is provided.
  • the premixing step may include: a first premixing step of kneading the raw gypsum or dried gypsum, paper chips and / or chips in a first premixer, And a gypsum material having hydration-hardening properties in a second premixer in a second premixer.
  • the present invention provides the above-mentioned method for producing a gypsum board, wherein the premixing step comprises kneading raw dihydrate gypsum or dried gypsum and paper chips and / or chips in a premixer. Is what you do.
  • the present invention provides a step of kneading at least one gypsum selected from the group consisting of fresh gypsum and dried gypsum and a hydration-hardening gypsum in a premixer,
  • a gypsum comprising: a step of kneading the obtained kneaded material, water and, as necessary, various additives (agents) in a continuous mixer to prepare a raw material slurry; and a step of pouring and forming the raw material slurry.
  • a method for manufacturing a board is provided.
  • the present invention further comprises: a step of drying the raw dihydrate gypsum to obtain a dried gypsum; and a step of only pulverizing and drying the dried gypsum to obtain a hydrate-setting gypsum. And a method for producing a gypsum board.
  • the present invention provides a gypsum board manufactured by the above manufacturing method. Further, the present invention comprises kneading at least one type of gypsum selected from the group consisting of fresh gypsum, dried gypsum and hydration-hardening gypsum with a paper chip and / or a chip body.
  • a raw material containing the obtained kneaded material, water, and, if necessary, various additives (agents) are continuously supplied and kneaded, and the obtained raw material slurry (provided that the raw material slurry Is a gypsum board having a hydration-hardening gypsum as an essential component), and a means capable of pouring and molding the raw material slurry.
  • a manufacturing apparatus is provided.
  • the present invention provides a dryer for drying raw dihydrate gypsum to obtain dried dihydrate gypsum, a pulverizer for pulverizing the dried gypsum, and a hydration-curable gypsum obtained by calcining the pulverized dry gypsum.
  • An apparatus for producing a gypsum board further comprising: a calcining furnace; BRIEF DESCRIPTION OF THE FIGURES
  • FIG. 1 is a process chart for explaining one embodiment of the production method of the present invention.
  • 2 to 8 are process diagrams for explaining another embodiment of the production method of the present invention.
  • 9 to 15 are cross-sectional views for explaining a premixer suitably used in the production apparatus of the present invention.
  • Fig. 16 is a diagram for explaining the continuous mixer and the casting means.
  • Figs. 17 to 18 show the problems when manufacturing a composite gypsum board using a conventional general gypsum board production line. It is a process drawing for explaining a point in detail.
  • FIG. 1 is a process chart for explaining one embodiment of the production method of the present invention.
  • the raw dihydrate gypsum 1 1 is transferred to the dryer 1 2 and is dried and crushed by the mill 13 c Subsequently, it is calcined in a calcining furnace 14 to change into hemihydrate gypsum having hydration-hardening property, pulverized to a desired size by a pulverizer 15 and temporarily stored in a hemihydrate gypsum silo 16. Subsequently, the hemihydrate gypsum in the hemihydrate gypsum rhinoceros mouth 16 and the chips 22 are kneaded (premixed) by the premixer 130.
  • the obtained kneaded material is sent to the continuous mixer 31, and at the same time, the kneading water 21 and, if necessary, the additive (agent) 23 are also introduced into the continuous mixer 31 and kneaded, and the obtained raw material is obtained.
  • the slurry is introduced into the casting means 32. According to this aspect, since the hemihydrate gypsum and the chips 22 are kneaded in advance by the premixer 30, the chips can be stably introduced into the continuous mixer.
  • FIG. 2 is a process chart for explaining another embodiment of the production method of the present invention.
  • the raw dihydrate gypsum 11 is transferred to a dryer 12, and after drying, is ground by a mill 13. Subsequently, it is calcined in a calciner 14 to change into hemihydrate gypsum having hydration-hardening property, pulverized to a desired size by a pulverizer 15 and temporarily stored in a hemihydrate gypsum silo 16. Subsequently, the hemihydrate gypsum and the chips 22 in the hemihydrate gypsum silo 16 and the raw dihydrate gypsum 11 are kneaded (premixed) by a premixer 30.
  • the obtained kneaded material is sent to the continuous mixer 31, and at the same time, the kneading water 21 and, if necessary, the additive (agent) 23 are also introduced into the continuous mixer 31 and kneaded to obtain the raw material.
  • the slurry is introduced into the casting means 32.
  • the chips 22 and the raw dihydrate gypsum 11 are kneaded in advance by the premixer 30, the chips can be stably introduced into the continuous mixer. By transferring part of the water plaster 11 to the premixer, the energy required for drying, milling and calcining can also be saved.
  • the time from kneading the gypsum hemihydrate and gypsum to the continuous mixer be shorter.
  • FIG. 3 is a process chart for explaining another embodiment of the production method of the present invention.
  • This production method is almost the same as that of FIG. 2, except that the dried gypsum dried by the dryer 12 is mixed with the gypsum in the hemihydrate gypsum silo 16 and the chips 22 by the pre-mixer 30. Kneaded (premixed). Part of the dried gypsum The energy required for grinding and calcination can be saved by being transferred to the premixer.
  • FIG. 4 is a process chart for explaining another embodiment of the production method of the present invention.
  • This production method is almost the same as that of the embodiment of FIG. 2, but first, the raw dihydrate gypsum 11 and the chip 22 are kneaded by the first premixer 301, and the obtained kneaded material and the hemihydrate gypsum The hemihydrate gypsum in the mouth 16 is kneaded by the second premixer 302.
  • the surface of the chip is wetted by the adhering moisture of the raw gypsum and can form a strong interface with the gypsum matrix, and more excellent gypsum such as bending strength, screws, nail pulling resistance and the like can be obtained.
  • Board can be provided.
  • FIG. 5 is a process chart for explaining another embodiment of the production method of the present invention.
  • This production method is almost the same as the embodiment of FIG. 4, except that the dried dihydrate gypsum dried by the dryer 12 and the chips 22 are kneaded by the first premixer 301 (first premix).
  • the obtained kneaded material and the hemihydrate gypsum in the hemihydrate gypsum silo 16 are kneaded by the second premixer 302 (second premix).
  • FIG. 6 is a process chart for explaining another embodiment of the production method of the present invention.
  • the hemihydrate gypsum in the hemihydrate gypsum silo 16 is directly introduced into the continuous mixer 31 without passing through the premixer 30 in the embodiment of FIG.
  • the premixer 30 may be kneaded not with the fresh gypsum gypsum but with the dried gypsum gypsum dried by the dryer 12 and the chips 22.
  • FIG. 7 is a process chart for explaining another embodiment of the production method of the present invention.
  • This embodiment relates to a manufacturing method that does not use a chip.
  • the raw dihydrate gypsum 11 is transferred to a dryer 12 and is dried and crushed by a crusher 13. Subsequently, it is calcined in a calciner 14 to be converted into a hydrate-hardening gypsum, crushed to a desired size by a crusher 15 and temporarily stored in a hemihydrate gypsum silo 16. You. Subsequently, the gypsum hemihydrate in the gypsum hemihydrate gypsum mouth 16 and the gypsum fresh dihydrate 11 are kneaded by the premixer 30.
  • the obtained kneaded material is sent to the continuous mixer 31, and at the same time, the kneading water 21 and, if necessary, the additive (agent) 23 are also introduced into the continuous mixer 31 and kneaded, and the obtained raw material is obtained.
  • the slurry is introduced into the casting means 32.
  • FIG. 8 illustrates another embodiment of the production method of the present invention.
  • FIG. This production method is almost the same as the embodiment of FIG. 7, except that the dried dihydrate gypsum dried by the dryer 12 is kneaded by the premixer 30 together with the hemihydrate gypsum in the hemihydrate gypsum silo 16. .
  • the energy required for milling and calcination can be saved.
  • raw dihydrate gypsum is used as a starting material, which is dried, pulverized, and calcined to obtain hemihydrate gypsum.
  • preparation process is described as one production line, it is also possible to use hydrate-curable gypsum material (for example, commercially available gypsum material) manufactured in another place and premix chips .
  • Gypsum having hydration-hardening properties is not limited to hemihydrate gypsum, and various types of gypsum materials described below can be used.
  • the dryer 11 and the crusher 13 are shown as separate devices.However, if necessary, high-temperature gas is blown into the mill to simultaneously perform drying and crushing. A device capable of performing the above may be used.
  • the production apparatus of the present invention includes a premixer 30, a continuous mixer 31, and a casting means 32 in order to carry out the production method of the present invention described above.
  • the manufacturing apparatus of the present invention is characterized in that it has a premixer 30 as compared with a conventional gypsum board manufacturing apparatus.
  • the premixer 30 that can be suitably used in the apparatus of the present invention will be described.
  • premixer used in the present invention include a screw feeder, a paddle mixer, a pug mixer, a ribbon mixer, a pro-share mixer, a Henschel mixer, a spiral 'pin mixer (trade name), and the like. These mixers will be briefly described with reference to the drawings.
  • FIG. 9 is a sectional view of one screw feeder. Material is from input port 1 to case It is introduced into 2, and is kneaded while being moved by a screw blade 51 provided on a rotating shaft 4 rotated by a motor 3, and is discharged from a discharge port 6. Screw feeders are small and inexpensive, and good mixing effects can be expected. The screw feeder can be particularly preferably used in the embodiments of FIGS. 1, 3, 5, 6, and 8 described above.
  • FIG. 10 is a cross-sectional view of the middle mixer.
  • the material is introduced into the case 2 from the inlet 1, kneaded while being moved by the paddle 52 provided on the rotating shaft 4 rotated by the motor 3, and discharged from the outlet 6.
  • Paddle mixers can be expected to have good mixing effects.
  • the paddle mixer can be suitably used in all the embodiments of FIGS. 1 to 8 described above.
  • Fig. 11 (a) is a cross-sectional view of the bag mixer, and (b) is a cross-sectional view taken along line AA.
  • the material is introduced into the case 2 from the inlet 1 and kneaded while being moved by the screw blades 51 and the paddles 52 provided on the two rotating shafts 4, 4, which are rotated by the motor 1, Discharged from outlet 6.
  • Paddle mixers can be expected to have good mixing effects.
  • the bag mixer can be suitably used in all the embodiments of FIGS. 1 to 8 described above.
  • FIG. 12 is a cross-sectional view of the ribbon mixer.
  • the material is introduced into the case 2 from the inlet 1, kneaded while moving by the ribbon blade 5 3 provided on the rotating shaft 4 rotated by the motor 3, and discharged from the outlet 6.
  • Ribbon mixers are relatively inexpensive, can process large quantities, and have good mixing effects.
  • the ribbon mixer can be particularly preferably used in the embodiments of FIGS. 1, 3, 5, 6, and 8 described above.
  • Fig. 13 (a) is a cross-sectional view of a pro-share mixer, and (b) is a cross-sectional view taken along line BB.
  • the material is introduced into the case 2 from the inlet 1, and the excavator blades 5 4 provided on the rotating shaft 4 that rotates by the motor 3, and a motor provided separately at the lower part of the case 2 It is kneaded while moving by a chopper 55 rotating by one (not shown), and is discharged from a discharge port 6.
  • Proshare mixers are relatively small and can be expected to have better mixing effects.
  • Procami The mixer can be particularly preferably used in the embodiments of FIGS. 2, 4, and 7 described above.
  • Fig. 14 (a) is a cross-sectional view of the Henschel mixer, and (b) is a cross-sectional view taken along line C-C.
  • the material is introduced into the case 2 from the input port 1 and is kneaded by the mixing blades 56 provided on the rotating shaft 4 that rotates by the motor 3 .
  • the kneaded material is rotated by the motor 3 ′ It is moved by the screw blade 51 provided on the rotating shaft 4 ′ and discharged from the discharge port 6.
  • the Henschel mixer can be expected to have a good mixing effect.
  • FIG. 15 is a sectional view of a spiral pin mixer.
  • the material is introduced into the case 2 from the inlet 1, kneaded by the dispersing pins 57 provided at the outlet 5 rotated by the motor 3, and discharged from the outlet 6.
  • Spiral and pin mixers can be expected to have good mixing effects.
  • the continuous mixer 31 has been conventionally used for the production by continuous casting of gypsum board, that is, capable of high-speed kneading, and of the raw material slurry 41 in the mixer. It is possible to use a material having a short residence time, but when compounding the chip 22, it is preferable that the chip 22 does not easily adhere to the inside.
  • the casting means 32 may be a known one which has been conventionally used for continuous gypsum board production by continuous casting, and is not particularly limited.
  • FIG. 16 is a diagram for explaining the continuous mixer and the casting means.c
  • the continuous mixer 31 is provided inside the container 311 and the container 311 and is opened and closed all at once. It has rotating stirring blades 312, and various materials including chips 22 are introduced into the container 311, and a raw material slurry can be obtained by kneading (stirring and mixing).
  • the raw material slurry obtained by kneading can be discharged from the outlet 313 continuously.
  • the raw material slurry 41 is continuously poured from the outlet 3 13 of the container 3 1 1 onto the moving conveyor 4 3 on which the base paper for board 4 2 is placed, the casting slurry is leveled.
  • the paper is sandwiched between board base papers 4 2 ′, and after traveling for a predetermined time (for example, 2 minutes), solidified and cured to some extent, cut into a desired size by a cutting machine 45, passed through a drying process, and then subjected to a gypsum board 5. Is to get 0.
  • a predetermined time for example, 2 minutes
  • Raw materials for chips include, for example, newspaper paper, insert advertising paper, book paper such as magazines and paperbacks, copy paper, cardboard paper, packaging paper, work paper, these wastes, and building materials (eg, gypsum board using paperboard). Examples include paper separated from offcuts, generated materials, loss materials, and the like. In addition, floppy disks, recording tapes, video magnetic tapes, tickets, betting tickets, agricultural sheets, non-woven fabrics, woven fabrics, etc., and their waste can also be used as raw materials.
  • the size of the chip is appropriately selected in consideration of the strength and the type of the target composite gypsum board, but for example, has a flat portion of l mm X l mm to 5 O mm x 50 mm. Things are good.
  • the thickness is preferably, for example, about 0.05 to 2 mm.
  • the shape of the chip can be, for example, a square, a rectangle having a long side / short side ratio of 1 to 10, a circle, a triangle, or an irregular shape.
  • the chip can be manufactured by a known dry pulverization method, wet pulverization method, or the like. If desired, surface treatment of the chip, fluffing, and the like can be combined. When a magnetic material or a plastic material is used as the chip, it is preferable to mix a gypsum material with an aqueous adhesive and coat the chip with a coupling agent.
  • the raw dihydrate gypsum, dried gypsum, and hydration-curable gypsum material that can be used in the present invention are not particularly limited as long as the material is a gypsum-like material that can be a matrix capable of dispersing and holding chips.
  • the hydration setting gypsum includes calcined gypsum, cast hemihydrate gypsum, type III anhydrous gypsum, type II anhydrous gypsum and the like. These are gypsum which changes to gypsum by the hydration reaction in the presence of water and hardens.
  • the raw dihydrate gypsum in the present invention is a gypsum material having an attached moisture of usually several percent to several tens percent, as described above, such as natural gypsum, drainage gypsum, phosphate gypsum, and the like.
  • Dry Dry dihydrate gypsum is a gypsum material that has been heated and dried to remove the adhering moisture, and is not heated to a firing temperature for obtaining hydration curability.
  • the mixing ratio of the chips to the gypsum material can be appropriately selected according to the target gypsum board size and intended use.For example, it greatly improves the bending strength of the gypsum board and the resistance to pulling out screws and nails.
  • additives can be blended as needed in order to improve desired properties.
  • additives (agents) used in the production of ordinary gypsum board include, for example, water reducing agents, foaming agents, retarders, and sizing agents.
  • various auxiliary materials such as aggregate, flame retardant, and binder can be added.
  • Specific examples include reinforcing fibers, sawdust, wood chips, perlite, vermiculite, starch, PVA, and oxidized starch.
  • the mixing ratio of these additives (agents) is preferably, for example, about 0.1 to 3% by weight based on the gypsum material.
  • the specific gravity of the gypsum board thus obtained is usually 0.5 to 1.6 g / cm 3 , preferably 0.7 to 1.5 g / cm 3 .
  • the method and apparatus which can manufacture the gypsum board which is extremely excellent in bending strength and the screw and nail pull-out resistance, and which improved various performances stably with good productivity are provided. Notable effects are achieved for the items described above.
  • the supply of chips is unstable due to bulkiness.
  • the rotor in the continuous mixer is rotating at high speed, it is highly possible that a predetermined amount is not supplied into the continuous mixer, for example, in the case of a dropping method using a natural fall method, chips fly in the supply path.
  • chips and gypsum material are premixed and continuously mixed Feeding the mixer solves these problems.
  • fresh gypsum has attached moisture of several percent to several tens percent, and when it is transferred to a continuous mixer as it is, it adheres strongly to the transfer path and hinders stable supply to the continuous mixer. Cause.
  • the adhesiveness is reduced and stable supply to the continuous mixer is possible.
  • the structure of the gypsum board is homogenized.
  • the premix ensures a homogeneous mixing of the materials and significantly reduces the amount of chip agglomerates and gypsum material agglomerates.
  • gypsum board with improved product performance mechanical properties, durability, fire resistance, etc.
  • the premix forms a thin layer of gypsum hemihydrate on the surface of the chips.
  • hydrated reaction by thin layer portion (CaS0 4 l / 2 H 2 0-> CaS0 4 -. 2 H 2 0) occurs chisel fine fine the
  • the hydrate crystals enter the chip microstructure, resulting in a strong interface (strong adhesion) between the chip and the gypsum material.
  • strong adhesion strong adhesion
  • Chips when used as a raw material for gypsum board, have a large flat surface area and a small thickness, so when kneaded with water, they can be easily adhered to the inner wall of a continuous mixer or to raw materials.
  • the premix forms a thin layer on the surface of the chips as described in 4 above, thereby reducing the adhesion of chips to the continuous mixer.

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  • Processing Of Solid Wastes (AREA)
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Abstract

La présente invention concerne un procédé de fabrication d'une plaque de plâtre comprenant plusieurs opérations. D'abord, on sèche en séchoir (12) du plâtre vert à l'état de dihydrate de gypse, et on le broie dans un broyeur (13), puis on calcine dans un four de calcination (14) le gypse broyé. On broie de nouveau le gypse calciné dans un broyeur (15) de façon à obtenir du gypse semi-hydrate que l'on stocke temporairement dans un silo de gypse semi-hydrate, puis on fait un prémélange de gypse semi-hydrate et de copeaux (22) dans un pré-mixer (30). Il ne reste plus qu'à mélanger et malaxer le mélange obtenu avec de l'eau et les divers additifs nécessaires dans un mélangeur en continu (32) pour obtenir une barbotine, puis à couler cette barbotine dans un moule à barbotine (32) pour obtenir une plaque de plâtre. Ce procédé permet de réaliser, avec un niveau de productivité relativement bon et stable, une plaque de plâtre qui présente une bonne résistance au fléchissement, une bonne résistance à l'arrachage des clous, et ce, tout en présentant de multiples améliorations qualitatives.
PCT/JP1999/001640 1999-03-30 1999-03-30 Fabrication de plaques de platre et dispositif a cet effet WO2000059842A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP1999/001640 WO2000059842A1 (fr) 1999-03-30 1999-03-30 Fabrication de plaques de platre et dispositif a cet effet
AU33266/00A AU3326600A (en) 1999-03-30 2000-03-23 Gypsum board, gypsum board producing method and gypsum board producing device
PCT/JP2000/001790 WO2000059698A1 (fr) 1999-03-30 2000-03-23 Plaque de platre, procede de production de plaque de platre et appareil de production de plaque de platre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/001640 WO2000059842A1 (fr) 1999-03-30 1999-03-30 Fabrication de plaques de platre et dispositif a cet effet

Publications (1)

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WO2000059842A1 true WO2000059842A1 (fr) 2000-10-12

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PCT/JP1999/001640 WO2000059842A1 (fr) 1999-03-30 1999-03-30 Fabrication de plaques de platre et dispositif a cet effet
PCT/JP2000/001790 WO2000059698A1 (fr) 1999-03-30 2000-03-23 Plaque de platre, procede de production de plaque de platre et appareil de production de plaque de platre

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PCT/JP2000/001790 WO2000059698A1 (fr) 1999-03-30 2000-03-23 Plaque de platre, procede de production de plaque de platre et appareil de production de plaque de platre

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AU (1) AU3326600A (fr)
WO (2) WO2000059842A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2916378A1 (fr) * 2007-05-25 2008-11-28 Charles Falinower Dispositif du type mixeur, pour gacher du platre en continu, permettant d'augmenter la capacite de production et reduire les couts de fabrication des plaques de platre.
US20100025510A1 (en) * 2008-02-20 2010-02-04 National Gypsum Properties, LLC, a limited Liability Company of the State of Delaware Method and System for Stucco Conditioning

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170116380A (ko) * 2016-04-11 2017-10-19 유에스지 보랄 빌딩 프로덕츠 에스디엔. 비에이치디. 석고보드 조성물, 석고보드 제조방법, 및 이로부터 제조된 석고보드
HUE060888T2 (hu) 2020-10-19 2023-04-28 Lindner Norit Gmbh & Co Kg Eljárás gipszkartonanyag újrahasznosítására
CN112456946A (zh) * 2020-12-03 2021-03-09 李涛 一种纳米微膨胀无机注浆材料及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08231257A (ja) * 1995-02-24 1996-09-10 Chichibu Onoda Cement Corp 複合無機質板
JPH09227207A (ja) * 1996-02-22 1997-09-02 Chichibu Onoda Cement Corp 複合石膏ボード

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US3682670A (en) * 1970-07-02 1972-08-08 Rustan As B Process for the preparation of fiber-containing plaster products
JPS5181820A (en) * 1975-01-13 1976-07-17 Nihon Cement Setsukobanno seizohoho
JPH0712968B2 (ja) * 1987-05-22 1995-02-15 小野田セメント株式会社 セルロ−ス繊維強化石膏ボ−ドの製造方法
JPH0747537A (ja) * 1993-07-27 1995-02-21 Sekisui Chem Co Ltd 水硬性無機質組成物の製造方法
EP0811585A4 (fr) * 1995-02-24 1998-05-20 Chichibu Onoda Cement Corp Plaque de platre composite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08231257A (ja) * 1995-02-24 1996-09-10 Chichibu Onoda Cement Corp 複合無機質板
JPH09227207A (ja) * 1996-02-22 1997-09-02 Chichibu Onoda Cement Corp 複合石膏ボード

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2916378A1 (fr) * 2007-05-25 2008-11-28 Charles Falinower Dispositif du type mixeur, pour gacher du platre en continu, permettant d'augmenter la capacite de production et reduire les couts de fabrication des plaques de platre.
WO2009004148A2 (fr) * 2007-05-25 2009-01-08 Charles Falinower Dispositif du type mixeur, pour gacher du platre en continu, et son application notamment pour fabriquer des plaques avec un coeur de platre a densite differenciee
WO2009004148A3 (fr) * 2007-05-25 2009-04-09 Charles Falinower Dispositif du type mixeur, pour gacher du platre en continu, et son application notamment pour fabriquer des plaques avec un coeur de platre a densite differenciee
US20100025510A1 (en) * 2008-02-20 2010-02-04 National Gypsum Properties, LLC, a limited Liability Company of the State of Delaware Method and System for Stucco Conditioning

Also Published As

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WO2000059698A1 (fr) 2000-10-12
AU3326600A (en) 2000-10-23

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