WO2000059698A1 - Plaque de platre, procede de production de plaque de platre et appareil de production de plaque de platre - Google Patents

Plaque de platre, procede de production de plaque de platre et appareil de production de plaque de platre Download PDF

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Publication number
WO2000059698A1
WO2000059698A1 PCT/JP2000/001790 JP0001790W WO0059698A1 WO 2000059698 A1 WO2000059698 A1 WO 2000059698A1 JP 0001790 W JP0001790 W JP 0001790W WO 0059698 A1 WO0059698 A1 WO 0059698A1
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WO
WIPO (PCT)
Prior art keywords
gypsum
gypsum board
chips
dried
raw
Prior art date
Application number
PCT/JP2000/001790
Other languages
English (en)
Japanese (ja)
Inventor
Norifumi Nagata
Sumio Honda
Shinkichi Tanabe
Kazuo Takeuchi
Koichi Kuwayama
Nobuyuki Kimura
Kunio Motoyoshi
Hidero Nakaya
Original Assignee
Building Materials Technology Laboratories, K.K.
Taiheiyo 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., Taiheiyo Engineering Co., Ltd., Taiheiyo Cement Corporation filed Critical Building Materials Technology Laboratories, K.K.
Priority to AU33266/00A priority Critical patent/AU3326600A/en
Publication of WO2000059698A1 publication Critical patent/WO2000059698A1/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

  • Gypsum board, gypsum board manufacturing method and gypsum board manufacturing apparatus Description Gypsum board, gypsum board manufacturing method and gypsum board manufacturing apparatus
  • the present invention relates to a gypsum board, 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 a gypsum board having remarkably excellent bending strength, resistance to pulling out screws and nails, and various performances with good productivity. Further, the present invention relates to a gypsum board capable of obtaining desired bending strength and screw / nail pull-out resistance even when manufactured by an arbitrary manufacturing method. Background art
  • 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-type pulverizer such as a hammer mill or a wet defibration machine such as pulper. This is done by dispersing in a gypsum material matrix. This method is effective for reinforcing gypsum board.
  • the defibrated fiber becomes very bulky, and this is the case. Even if you try to knead the bulky fiber and the powder of the gypsum material together with water, a uniform mixture is obtained. It is technically difficult to obtain efficiently.
  • the fiberized pulp in the prior art is usually fine fibers 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, It significantly reduces the fluidity of the slurry. Therefore, in a gypsum board production line produced through slurrying of raw materials, usually, only about 0.1 to 2%, at most 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 is prepared by mixing paper chips and / or chips with a gypsum material, and the paper chips and / or chips are oriented substantially parallel to a plane perpendicular to the thickness direction of the composite gypsum board. Is what it is.
  • such composite gypsum board prepares a raw material slurry containing gypsum material, paper chips and / or chips, water, and various types of filler materials as needed, and supplies them to a movable conveyor. While moving the conveyor, the paper chips and / or chips contained in the raw slurry are oriented by an orientation means so as to be substantially parallel to the plane perpendicular to the thickness direction of the composite gypsum board to be obtained. Is done.
  • 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.
  • the gypsum material, paper chips and / or chips, water, and, if necessary, various filler materials are continuously continuously used.
  • the raw material slurry is prepared by putting the slurry in a mixer, there is a problem that the supply to the continuous mixer becomes unstable due to the bulk of the paper chips and / or chips in the process. For example, since the rotor in the continuous mixer is rotating at high speed, the paper chips and / or chip bodies flowing from the supply path are blown up and flutter in the supply path, making it difficult to supply a predetermined amount. .
  • 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%. Adhesion to the path is severe, and stable supply to the continuous mixer becomes difficult. There are also problems.
  • FIG. 18 and FIG. 19 are process drawings for explaining in detail the problems when the above-mentioned composite gypsum board is manufactured using a conventional general gypsum board manufacturing line.
  • gypsum that has not been dried hereinafter referred to as raw gypsum
  • the raw dihydrate gypsum 11 is transferred to a dryer 12, and after drying, is ground by a mill 13.
  • a calciner 14 it is calcined in a calciner 14 to be converted 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.
  • 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 of FIG. 18, as described above, the chip may not be stably introduced due to the high-speed rotation of the mouth in the continuous mixer 31.
  • FIG. 19 is a process chart in the case of producing a gypsum board using no gypsum material composition and containing the above-described gypsum material composition.
  • the fresh gypsum plaster 1 1 is dried with a dryer 1 2, pulverized with a pulverizer 13, calcined in a calciner 14, and the obtained hemihydrate gypsum is pulverized with a pulverizer 15 to obtain semi-hydrated water.
  • the process of temporarily storing in gypsum silo 16 is the same as in FIG.
  • 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. .
  • Another object of the present invention is to provide a gypsum board capable of obtaining desired bending strength and screw / nail pull-out resistance even when manufactured by an arbitrary manufacturing method. Disclosure of the 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 blending step comprises kneading a raw dihydrate gypsum or a dried dihydrate gypsum, a hydrate-curable gypsum, 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 the dried gypsum, and a paper chip and / or a chip body in the first premixer; And a gypsum material having hydration-hardening properties in a second premixer, and a second premixing step of kneading the same in a second premixer.
  • the present invention provides the method for producing a gypsum board according to the above, wherein the premixing step comprises kneading the raw gypsum or the dried gypsum and the paper chips and / or chips in a premixer. Things.
  • the present invention provides a method of kneading at least one gypsum selected from the group consisting of fresh gypsum and dried gypsum, and gypsum having hydration-hardening property in a premixer.
  • a method for producing a gypsum board containing the same are examples of additives (agents) in a continuous mixer.
  • the present invention further comprises a step of drying the raw dihydrate gypsum to obtain a dried gypsum, and a step of only grinding or burning 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.
  • 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. And 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 dihydrate 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;
  • the present invention provides a gypsum board in which a paper chip and / or a chip body is blended with a gypsum material, wherein the plane part of the paper chip and / or the chip body is a plane perpendicular to the thickness direction of the gypsum board.
  • the present invention provides a gypsum board characterized by having an average angle of 30 ° or less with respect to the gypsum board.
  • the present invention provides the gypsum board, wherein the mixing ratio of the paper chips and / or chips is 0.2 to 25% by weight based on the weight of the gypsum material.
  • the present invention also provides a paper chip and / or a chip body having a size of 1 mm X 1 mm to 50 mm. It is an object of the present invention to provide the gypsum board having a plane portion having a size of mm ⁇ 50 mm.
  • the present invention provides the gypsum board, wherein the paper chip and / or the chip body has a long side / short side ratio of 1 to 10.
  • 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.
  • C FIG. 17 is a diagram showing the relationship between the average angle of the paper sheet in Table 1 and the nail pull-out resistance.
  • FIGS. 18 to 19 are process diagrams for explaining in detail the problems in producing a composite gypsum board using a conventional general gypsum board production line.
  • FIG. 1 is a process chart for explaining one embodiment of the production method of the present invention.
  • the raw dihydrate gypsum 11 is transferred to the dryer 12 and dried and crushed by the pulverizer 13 c.Then, it is calcined in the calciner 14 to change to hydration-hardening gypsum. Then, it is ground to a desired size by a crusher 15 and temporarily stored in a hemihydrate gypsum silo 16 c. Subsequently, the hemihydrate gypsum in the hemihydrate gypsum rhinoceros 16 and the chips 22 are premixed. Kneaded (premixed) with 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 cast Introduced in 32. According to this aspect, since the hemihydrate gypsum and the chips 22 are kneaded in advance by the premixer 130, 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 is dried and ground by a mill 13. Subsequently, it is calcined in a calcining furnace 14 to be converted 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.
  • 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.
  • the energy required for drying, milling and calcining can also be saved.
  • it is preferable that the time from mixing of the gypsum hemihydrate and gypsum to the introduction of the gypsum to the continuous mixer is 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 the embodiment of FIG. 2, except that the dried dihydrate gypsum dried by the dryer 12 is mixed with the gypsum in the hemihydrate gypsum syrup 16 and the chips 22 together with the premixer 30. Is kneaded (premixed). By transferring part of the dried gypsum to the premixer, the energy required for grinding and calcination can be saved.
  • 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 shown in FIG. 2, but first, raw dihydrate gypsum 11 and chip 22 are kneaded by a first premixer 301, and the obtained kneaded material and hemihydrate gypsum silo The hemihydrate gypsum in 16 is kneaded by the second premixer 302.
  • the surface of the chip can be wet with the adhering moisture of the raw gypsum to form a strong interface with the gypsum matrix, and more excellent gypsum such as bending strength, screw and nail pull-out resistance, etc. 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 change into hemihydrate gypsum having a hydration-hardening property, pulverized to a desired size by a pulverizer 15 and temporarily stored in a hemihydrate gypsum silo 16.
  • a calciner 14 to change into hemihydrate gypsum having a hydration-hardening property
  • pulverized to a desired size by a pulverizer 15 and temporarily stored in a hemihydrate gypsum silo 16.
  • 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.
  • the hemihydrate gypsum and the fresh dihydrate gypsum 11 are previously kneaded by the premixer 30, so that the raw dihydrate gypsum 11 can be stably introduced into the continuous mixer.
  • the energy required for drying, milling and calcining can be saved.
  • FIG. 8 is a process chart for explaining another embodiment of the production method of the present invention. This manufacturing method is almost the same as that of the embodiment of FIG. 7, but is dried by the dryer 12.
  • the dried dihydrate gypsum is kneaded with the hemihydrate gypsum in the gypsum hemihydrate gypsum 16 by the premixer 30.
  • the energy required for milling and calcination can be saved.
  • raw dihydrate gypsum is used as a starting material, which is dried, crushed and calcined to obtain hemihydrate gypsum, and water and other raw materials are added thereto to prepare a raw material slurry.
  • the process is described as one production line, but it is also possible to use a hydration-hardening gypsum material (for example, a commercially available gypsum material) manufactured at another location, and blend the chips with the gypsum material.
  • 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 production apparatus of the present invention is characterized in that it is provided with a blender 30 as compared with a conventional gypsum board production apparatus.
  • the premixer 30 that can be suitably used in the apparatus of the present invention will be described.
  • pre-mixer used in the present invention include a screw feeder 1, a paddle mixer, a pug mixer, a ribbon mixer, a pro-share mixer, a Henschel mixer, a spiral bottle mixer (trade name) and the like. These mixers will be briefly described with reference to the drawings.
  • FIG. 9 is a sectional view of the screw feeder.
  • the material is introduced into the case 2 from the inlet 1, is kneaded while being moved by the screw blade 51 provided on the rotating shaft 4 rotated by the motor 1, and is discharged from the outlet 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 paddle mixer.
  • Material is in case 2 from inlet 1
  • the mixture is kneaded while being moved by a paddle 52 provided on a rotating shaft 4 which is rotated by a motor 3, and is discharged from a discharge port 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 is 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 3, and is discharged. Exhausted from 6.
  • Paddle mixers can be expected to have good mixing effects.
  • the pug 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 input port 1, kneaded while moving by the ribbon blade 5 3 provided on the rotating shaft 4 rotated by the motor 13, and discharged from the discharge port 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 flat shovel blades 54 provided on the rotating shaft 4 which is rotated by the motor 3, and the motor 1 provided separately below the case 2. It is kneaded while being moved by a chopper 55 rotating by a rotating (not shown), and is discharged from a discharge port 6.
  • Proshare mixers are relatively small and can be expected to have better mixing effects.
  • the pro-share 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 CC.
  • the material is introduced into the case 2 from the inlet 1 and is kneaded by the mixing blades 56 provided on the rotating shaft 4 rotated by the motor 3.
  • the kneaded material is rotated by the rotating shaft 4 by the motor 1, 3. Screw blades 5 And is discharged from outlet 6.
  • the Henschel mixer can be expected to have a good mixing effect.
  • FIG. 15 is a sectional view of a spiral bin mixer.
  • the material is introduced into the case 2 from the inlet 1, kneaded by the dispersing pins 57 provided on the rotor 5 rotated by the motor 3, and discharged from the outlet 6.
  • Spiral pin mixer can be expected to have a good mixing effect.
  • 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 rotated by the low speed and the low speed.
  • 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 continuously discharged from the discharge port 311.
  • the leveling roller is used.
  • the gypsum board 50 is obtained by being cut by a cutting machine 45 into the size shown in FIG.
  • the raw gypsum, dried gypsum, and hydration-hardening gypsum material that can be used in the present invention are chips
  • the material is not particularly limited as long as it is a gypsum-like material that can serve as a matrix capable of dispersing and holding the material.
  • 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.
  • By-product gypsum The dried dihydrate gypsum is a gypsum material that has been heated and dried to remove the attached 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.
  • 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 gypsum board, for example, 1 mm x 1 mn! It is preferable to have a flat part of up to 5 O mm X 50 mm.
  • 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.
  • a plaster material is mixed with an aqueous adhesive, and the chips are coated with a coupling agent. Is preferred.
  • a water-based adhesive and a coupling agent are blended, the mixing ratio thereof can be appropriately selected according to the size and application of the target composite gypsum board, the type of the chemical used, and the like.
  • the agent is for the gypsum material
  • the coupling material can be 0.01 to 3% by weight, preferably 0.1 to 1% by weight, based on the gypsum material. .
  • the chip has an average angle of 30 ° or less, preferably 20 ° or less with respect to a plane perpendicular to the thickness direction of the gypsum board, so that the chip can be manufactured by any manufacturing method. Even if it is, it becomes a gypsum board that can obtain the desired bending strength and screws' nail pull-out resistance.
  • the angle at which the chip exists was not considered at all, and when the angle was out of the above range, the bending strength and the screw / nail pull-out resistance were not sufficiently exhibited.
  • the chips are present in a direction perpendicular to the thickness direction, screws or nails will enter between the chips and break the chip and the gypsum-based matrix, causing the board to crack. Conversely, if the chips are more parallel to the plane perpendicular to the thickness of the gypsum board, there is a higher probability that screws or nails traversing the board will penetrate the plane of the chip, and the chips and screws or Screw and nail pull-out resistance increases due to frictional force with the nail.
  • the present invention clarifies the relationship between the existing angle of the chip and the screw / nail pull-out resistance in this operation, and in order to obtain a higher screw / nail pull-out resistance, the flat portion of the chip at the above specific angle is required. It was found that the existence of a
  • the angle distribution is the angle distribution of the plane portion of the chip with respect to the plane perpendicular to the thickness direction of the gypsum board.
  • FIG. 17 is a diagram showing the relationship between the average angle of the paper sheet in Table 1 and the nail pull-out resistance.
  • the gypsum board used in this example is made by laying back base paper in an acrylic mold, laying paper chips on it, pouring the gypsum slurry there once or three times, placing the front base paper on it, and curing it. Hold by a glass plate, then 60 °. And dried at 45 ° C for 2 days for 1 day.
  • the final size of the cured product was 10 cm in length ⁇ 2 O in width ⁇ 1.5 cm in thickness, and the specific gravity was 1.0 g / cc. Note that the angle distribution of the paper sheet can be easily controlled by adjusting the casting distance of the gypsum slurry.
  • the angle of the paper chip in the cured product was determined by cutting the cured product into 1.6 cm x 1.5 cm x 10 cm, and scanning the cross section with a scanner (Hewlett-Packard, product name scanjet4c). After clarifying the existence of the paper sheet by adjusting the contrast of the obtained image with image processing (Adobe Photoshop), the output diagram is further analyzed by an image analyzer (Nireco Co., Ltd.). No. LuzexIII).
  • Calcined gypsum (manufactured by San-es Gypsum Co., Ltd., special issue green, calcined gypsum) 100 parts by weight Polyvinyl alcohol (manufactured by Kuraray Co., Ltd., MSH 916) 0.3 parts by weight Water (tap water) 70 parts by weight
  • the nail pull-out resistance is set to 11.4 mm hole in the cured body, which is ⁇ 2.5 mm x 40 mm
  • the resistance (kgf) was measured when a 1.5 cm iron round nail was driven in and pulled out with a 2 mm crosshead using an Instron universal testing machine.
  • additives can be added to the gypsum board of the present invention 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, retarding agents, 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 compounding ratio of these additives 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. SgZcm 3 .
  • a method and apparatus capable of stably producing a gypsum board having excellent bending strength and resistance to pulling out screws and nails, and having improved various performances with high productivity. Even if it is manufactured by an arbitrary manufacturing method, a gypsum board capable of obtaining a desired bending strength and resistance to pulling out screws and nails is provided, and the following effects are particularly remarkable.
  • the supply of chips is unstable due to bulkiness.
  • chips flow in the supply path, for example, in the case of the natural drop type injection method, and the predetermined amount is not supplied to the continuous mixer. Probability is high. According to the present invention, such a problem is solved by premixing the chips and the gypsum material and supplying them to the continuous mixer.
  • fresh gypsum has attached moisture of several percent to several tens of percent, and when it is transferred to a continuous mixer as it is, it adheres strongly to the transfer path and requires a stable supply to the continuous mixer. It can be a hindrance.
  • 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 - 1/2 H 2 0 ⁇ CaS0 4 - 2 H 2 0) produce but fine fine water
  • the hydrate crystals penetrate the chip microstructure, resulting in a strong interface (strong adhesion) between the chip and the gypsum material.
  • mechanical strength such as bending strength, and the pulling resistance of screws and nails are improved.
  • Chip adhesion in the continuous mixer is reduced.
  • 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 easily stick to the inner wall or rotor of a continuous mixer.
  • 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.
  • the gypsum board of the present invention can reliably increase bending strength and resistance to pulling out screws and nails.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

On fait sécher un dihydrate (11) de gypse brut dans un séchoir (12), on le pulvérise dans un pulvérisateur (13), on le fait calciner dans un calcinateur (14), puis on le pulvérise de nouveau dans un pulvérisateur (15), ce qui permet d'obtenir un semi-hydrate de gypse qui est ensuite stocké dans un silo (16) de semi-hydrate de gypse, puis on effectue un mélange préalable du semi-hydrate de gypse et d'une particule (22) dans un dispositif de mélange préalable (30). Ensuite, on pétrit le produit pétri obtenu avec de l'eau et, si nécessaire, plusieurs matières (agents) d'addition dans un malaxeur (31) en continu pour produire une pâte primaire qui est alors coulée dans un dispositif (32) de coulage, ce qui permet d'obtenir une plaque de plâtre. En outre, on place la surface plate de la particule à une température inférieure ou égale à 30° par rapport à un plan perpendiculaire au sens d'épaisseur de la plaque de plâtre. Cette technique permet de produire, avec une productivité et une stabilité améliorées, une plaque de plâtre dotée d'une meilleure résistance à la courbure ou à l'arrachement des vis ou des clous, et présentant d'autres propriétés améliorées.
PCT/JP2000/001790 1999-03-30 2000-03-23 Plaque de platre, procede de production de plaque de platre et appareil de production de plaque de platre WO2000059698A1 (fr)

Priority Applications (1)

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AU33266/00A AU3326600A (en) 1999-03-30 2000-03-23 Gypsum board, gypsum board producing method and gypsum board producing device

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JPPCT/JP99/01640 1999-03-30
PCT/JP1999/001640 WO2000059842A1 (fr) 1999-03-30 1999-03-30 Fabrication de plaques de platre et dispositif a cet effet

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017179844A1 (fr) * 2016-04-11 2017-10-19 유에스지 보랄 빌딩 프로덕츠 에스디엔. 비에이치디. Composition de plaque de plâtre, procédé de fabrication de plaque de plâtre et plaque de plâtre fabriquée à partir de celle-ci
EP3984977B1 (fr) 2020-10-19 2022-11-09 Lindner NORIT GmbH & Co. KG Procédé de recyclage de panneau de plâtre

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2916378B1 (fr) * 2007-05-25 2012-10-26 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
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

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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
JPS63288933A (ja) * 1987-05-22 1988-11-25 Onoda Cement Co Ltd 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
WO1996026166A1 (fr) * 1995-02-24 1996-08-29 Chichibu Onoda Cement Corporation Plaque de platre composite

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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPS63288933A (ja) * 1987-05-22 1988-11-25 Onoda Cement Co Ltd 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
WO1996026166A1 (fr) * 1995-02-24 1996-08-29 Chichibu Onoda Cement Corporation Plaque de platre composite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017179844A1 (fr) * 2016-04-11 2017-10-19 유에스지 보랄 빌딩 프로덕츠 에스디엔. 비에이치디. Composition de plaque de plâtre, procédé de fabrication de plaque de plâtre et plaque de plâtre fabriquée à partir de celle-ci
EP3984977B1 (fr) 2020-10-19 2022-11-09 Lindner NORIT GmbH & Co. KG Procédé de recyclage de panneau de plâtre

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WO2000059842A1 (fr) 2000-10-12

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