JP3293938B2 - Fiber-containing gypsum board and method for producing the same - Google Patents
Fiber-containing gypsum board and method for producing the sameInfo
- Publication number
- JP3293938B2 JP3293938B2 JP7182393A JP7182393A JP3293938B2 JP 3293938 B2 JP3293938 B2 JP 3293938B2 JP 7182393 A JP7182393 A JP 7182393A JP 7182393 A JP7182393 A JP 7182393A JP 3293938 B2 JP3293938 B2 JP 3293938B2
- Authority
- JP
- Japan
- Prior art keywords
- gypsum
- weight
- type
- hemihydrate
- fiber
- 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
Links
Classifications
-
- 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
- C04B28/16—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 containing anhydrite, e.g. Keene's cement
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、繊維含有石膏抄造板
（以下、「繊維含有石膏板」とよぶ）及びその製造方法
に関するものである。The present invention relates to a fiber-containing gypsum papermaking plate
(Hereinafter referred to as “fiber-containing gypsum board”) and a method for producing the same.
【０００２】[0002]
【従来の技術】繊維含有石膏板は、曲げ強度、寸法安定
性に優れた不燃性材料であり、曲面加工が可能であるこ
とから、内装材として防火、耐火構造材料などに広く利
用されている。これらの石膏板においては、例えば特公
昭53−25339号公報、特公昭55−36628号公報、特公昭57
−49004号公報、特開昭60−42267号公報、特開昭60−17
1261号公報、特開昭62−191455号公報、特開昭63−6014
5号公報及び特開昭63−60146号公報に記載されているよ
うにマトリックスとしてβ−半水石膏、α−半水石膏、
ＩＩ型無水石膏が使用されている。2. Description of the Related Art Fiber-containing gypsum board is a non-combustible material having excellent bending strength and dimensional stability, and can be processed into a curved surface. Therefore, it is widely used as an interior material for fire prevention and fire-resistant structural materials. . In these gypsum plates, for example, JP-B-53-25339, JP-B-55-36628, and JP-B-57-36628.
-49004, JP-A-60-42267, JP-A-60-17
No. 1261, JP-A-62-191455, JP-A-63-6014
No. 5 and JP-A-63-60146, β-hemihydrate gypsum, α-hemihydrate gypsum as a matrix,
Type II anhydrous gypsum has been used.
【０００３】しかし、β−半水石膏は原料コストが高
く、α−半水石膏は更に高価であり、石膏板の原料とし
てはコスト的に好ましくない。ＩＩ型無水石膏は、硬化
する性質は認められるものの、反応性が弱く、硬化促進
剤を大量に用いたり、養生方法の検討を行わなければ満
足な硬化体は得られない。また、ＩＩ型無水石膏をより
効率よく硬化させるには、反応性を向上させる意味でＩ
Ｉ型無水石膏自体の粒度をブレーン値で８０００ｃｍ2
／ｇ以上程度まで細かくしなければならなかった。However, β-hemihydrate gypsum has a high raw material cost, and α-hemihydrate gypsum is more expensive, which is not preferable as a raw material for a gypsum plate. The type II anhydrous gypsum is cured, but its reactivity is weak, and a satisfactory cured product cannot be obtained unless a large amount of a curing accelerator is used or the curing method is not studied. In order to harden the type II anhydrous gypsum more efficiently, it is necessary to improve the reactivity in order to improve the reactivity.
The particle size of the type I anhydrous gypsum itself is 8000 cm 2 in Blaine value.
/ G or more.
【０００４】このように、ＩＩ型無水石膏を石膏板の原
料として使用するには、かなりの制約を受けることにな
る。更に、硬化促進剤の添加が必要であり、硬化促進剤
としてはＮａ2ＳＯ4、Ｋ2ＳＯ4などのアルカリ金属硫酸
塩が挙げられるが、これらはかなり高価であり、また、
白華成分となるため、セメント製品などとの生産ライン
併用が不可となる。また、これら硬化促進剤を添加する
と、嵩比重が高くなり、相対的に原料コストアップにつ
ながり、また、添加方法などにもよるが、作業性も悪く
なる。更に、ＩＩ型無水石膏粉体の粒度を細かくするこ
ともコストアップの原因となる。As described above, the use of type II anhydrous gypsum as a raw material for a gypsum board is considerably restricted. Further, it is necessary to add a curing accelerator, and examples of the curing accelerator include alkali metal sulfates such as Na 2 SO 4 and K 2 SO 4 , which are considerably expensive,
Since it is a efflorescence component, it cannot be used together with a production line with cement products. In addition, when these curing accelerators are added, the bulk specific gravity increases, which leads to a relative increase in raw material costs, and the workability also deteriorates depending on the method of addition. Further, reducing the particle size of the type II anhydrous gypsum powder also causes an increase in cost.
【０００５】[0005]
【発明が解決しようとする課題】前述の通り、半水石膏
をベースとした石膏板の製造の方が複雑な設備を必要と
せず、効率良く製品を造ることができる。しかし、半水
石膏のみでの硬化体は、半水石膏が高価なため、コスト
高となってしまう。また、ＩＩ型無水石膏をベースとし
た石膏板を製造するには、前にも記述した通り、混合水
(配合水)にＫ2ＳＯ4、Ｎａ2ＳＯ4などのアルカリ金属硫
酸塩を添加しなければならない。ＩＩ型無水石膏は安価
であるが、上記のアルカリ金属硫酸塩は高価であり、使
用量によってはコスト高になる恐れがある。また、同一
工場内では、排水が閉鎖系で製造ラインが複数であって
も水処理は同一系統で行うことが多く、他の製造品目
(例えばセメント製品)があると、その製品へ硫酸塩が悪
影響(白華現象)を及ぼす可能性が高い。As described above, the production of a gypsum board based on hemihydrate gypsum does not require complicated equipment, and a product can be produced efficiently. However, a cured body made of only hemihydrate gypsum is expensive because hemihydrate gypsum is expensive. In addition, in order to produce a gypsum board based on type II anhydrous gypsum, as described above, mixed water
An alkali metal sulfate such as K 2 SO 4 or Na 2 SO 4 must be added to (formulation water). The type II anhydrous gypsum is inexpensive, but the above alkali metal sulfate is expensive and may increase the cost depending on the amount used. Also, in the same factory, water treatment is often performed in the same system even if the drainage is closed and there are multiple production lines.
If there is a cement product (for example, a cement product), there is a high possibility that the sulfate will adversely affect the product (the efflorescence phenomenon).
【０００６】従って、本発明の目的は、無石綿品を生産
する上で安価なＩＩ型無水石膏を利用して物性を向上さ
せつつ、コストの低減を実現し、また、他の製品との併
産を可能とする繊維含有石膏板及びその製造方法を提供
することにある。Accordingly, an object of the present invention is to reduce costs while improving physical properties by using inexpensive type II anhydrous gypsum in producing asbestos-free products, and to reduce costs with other products. An object of the present invention is to provide a fiber-containing gypsum board that enables production and a method for producing the same.
【０００７】[0007]
【課題を解決するための手段】即ち、本発明に係る繊維
含有石膏板は、半水石膏及び半水石膏１００重量部当た
り１０〜４０重量部のＩＩ型無水石膏よりなる石膏原料
６０〜９７重量％、木質パルプ２〜１０重量％、及び炭
酸カルシウム、珪石粉またはそれら両者１０〜３０重量
％を主成分とすることを特徴とする。That is, the fiber-containing gypsum board according to the present invention is a gypsum raw material consisting of hemihydrate gypsum and 10 to 40 parts by weight of type II anhydrous gypsum per 100 parts by weight of hemihydrate gypsum. %, Wood pulp 2-10% by weight, and charcoal
It is characterized by containing calcium acid, silica powder or both of them as 10 to 30 % by weight as main components.
【０００８】更に、本発明に係る繊維含有石膏板の製造
方法は、半水石膏及び半水石膏１００重量部当たり１０
〜４０重量部のＩＩ型無水石膏よりなる石膏原料６０〜
９７重量％、木質パルプ２〜１０重量％、及び炭酸カル
シウム、珪石粉またはそれら両者１０〜３０重量％を含
有してなる原料混合物に、外割で０．１５〜０．３重量
％の石膏硬化遅延剤及び所定量の水を添加してスラリー
を得、得られたスラリーを抄造法により抄造することを
特徴とする。Further, the method for producing a fiber-containing gypsum board according to the present invention comprises the steps of:
Gypsum raw material 60 to 40 parts by weight of type II anhydrous gypsum
97% by weight, wood pulp 2-10% by weight, and calcium carbonate
A slurry is prepared by adding 0.15 to 0.3% by weight of a gypsum setting retarder and a predetermined amount of water to a raw material mixture containing 10 to 30 % by weight of calcium or silica powder or both of them. And the obtained slurry is formed by a papermaking method.
【０００９】本発明の繊維含有石膏板は、石膏マトリッ
クスに半水石膏とＩＩ型無水石膏とを併用することを特
徴とするものであるが、半水石膏のみ使用した場合より
２〜３割強度が増すことが判明した。半水石膏とＩＩ型
無水石膏の混合比率は、半水石膏１００重量部に対して
ＩＩ型無水石膏１０〜４０重量部、好ましくは１５〜３
０重量部の範囲内である。半水石膏１００重量部に対し
て４０重量部を超えるＩＩ型無水石膏を混合すると、得
られる繊維含有石膏板の強度は低下する。The fiber-containing gypsum board of the present invention is characterized in that hemihydrate gypsum and type II anhydrous gypsum are used together in a gypsum matrix, but the strength is 20 to 30% higher than when only hemihydrate gypsum is used. Was found to increase. The mixing ratio of hemihydrate gypsum and type II anhydrous gypsum is 10 to 40 parts by weight, preferably 15 to 3 parts by weight of type II anhydrous gypsum per 100 parts by weight of hemihydrate gypsum.
It is within the range of 0 parts by weight. If more than 40 parts by weight of type II anhydrous gypsum is mixed with 100 parts by weight of hemihydrate gypsum, the strength of the resulting fiber-containing gypsum board decreases.
【００１０】半水石膏とＩＩ型無水石膏を上記の割合で
混合することにより、水分の吸放出に伴う寸法安定性や
耐熱性を半水石膏のみ使用した時より向上させることが
できる。また、安価なＩＩ型無水石膏を利用することに
より、その分コストダウンが図れる。半水石膏リッチで
あるため、硬化には硬化遅延剤を用いるので、アルカリ
金属硫酸塩等を使用することもなく、従来通りで製造で
き、他製品との併産も可能となる。By mixing the hemihydrate gypsum and the type II anhydrous gypsum in the above ratio, the dimensional stability and heat resistance associated with the absorption and release of water can be improved as compared with the case where only the hemihydrate gypsum is used. In addition, the cost can be reduced by using inexpensive type II anhydrous gypsum. Since it is rich in hemihydrate gypsum, a curing retarder is used for curing, so that it can be produced in the conventional manner without using an alkali metal sulfate or the like, and can be co-produced with other products.
【００１１】なお、半水石膏とＩＩ型無水石膏とからな
る石膏原料の配合割合は、６０〜９７重量％の範囲内で
ある。石膏原料の配合割合が６０重量％未満であると、
材料の強度が低下し、また、９７重量％を超えると後述
の木質パルプや炭酸カルシウム、珪石粉を添加できなく
なるために好ましくない。The mixing ratio of the gypsum raw material composed of hemihydrate gypsum and type II anhydrous gypsum is in the range of 60 to 97% by weight. When the mixing ratio of the gypsum raw material is less than 60% by weight,
If the strength of the material is reduced, and if it exceeds 97% by weight, it is not preferable because wood pulp , calcium carbonate, and silica powder described below cannot be added.
【００１２】次に、炭酸カルシウム、珪石粉またはそれ
ら両者からなる無機骨材は複合材料の強度保持に大きな
役割を果たしている。本発明において、炭酸カルシウ
ム、珪石粉またはそれら両者の配合割合は、好ましくは
１０〜３０重量％の範囲内である。炭酸カルシウム、珪
石粉またはそれら両者の配合割合が１０重量％未満であ
ると、乾燥工程におけるマイクロクラック等の原因とな
り、強度劣化につながる恐れがあり、また、３０重量％
を超えると強度が著しく低下する。Next, calcium carbonate, silica powder or the same
The inorganic aggregate composed of the two plays a major role in maintaining the strength of the composite material . In the present invention, calcium carbonate
Beam, the mixing ratio of the silica powder or they both, is good Mashiku in the range of 10 to 30 wt%. Calcium carbonate, silica
If the mixing ratio of the stone powder or both is less than 10 % by weight, it may cause microcracks and the like in the drying process, leading to deterioration in strength, and 30 % by weight.
If it exceeds, the strength is significantly reduced.
【００１３】次に、木質パルプは、得られる石膏板の曲
げ強度、衝撃性を向上するために用いられる。木質パル
プの配合割合は、２〜１０重量％の範囲内が適当であ
る。木質パルプの配合割合が１０重量％を超えると、原
料混合時の分散性が悪く、その結果、得られる繊維含有
石膏板の強度が低下する。また、湿潤時の曲げ加工性に
も悪影響を及ぼす恐れもある。更に、木質パルプの配合
割合が２重量％未満であると、木質パルプの添加効果が
発現しない。Next, the wood pulp is used for improving the bending strength and impact strength of the obtained gypsum board . Wood pal
The mixing ratio of the flop is suitably in the range of 2-10 wt%. When the mixing ratio of the wood pulp exceeds 10% by weight, dispersibility at the time of mixing the raw materials is poor, and as a result, the strength of the obtained fiber-containing gypsum board is reduced. Further, there is a possibility that the bending workability when wet is adversely affected. Further, when the blending ratio of wood pulp is less than 2 wt%, the addition effect of the wood pulp is not exhibited.
【００１４】補強繊維は必要に応じて所定の叩解度に叩
解することができる。叩解度はカナディアン標準フリー
ネスで４００〜５０ｍｌ程度であるが、製造条件により
叩解度は異なる。なお、叩解には、ビーター、ディスク
リファイナー等の汎用機械を用いる。The reinforcing fibers can be beaten to a predetermined beating degree as required. The degree of beating is about 400 to 50 ml in Canadian standard freeness, but the degree of beating differs depending on manufacturing conditions. In addition, a general-purpose machine such as a beater and a disc refiner is used for the beating.
【００１５】半水石膏の硬化遅延剤としては、酒石酸ま
たはその金属塩の１種以上とアミノ酸誘導体(蛋白質を
加水分解することによって得られるアミノ酸のホルムア
ルデヒド縮合物)との組み合わせが適当であるが、半水
石膏とＩＩ型無水石膏、特に天然ＩＩ型無水石膏を併用
する場合、ＩＩ型無水石膏中に含まれる二水石膏により
硬化時間が大幅に短くなってしまう。従って、従来の半
水石膏のみの場合より、多量に遅延剤を添加しなければ
ならない。石膏硬化遅延剤の配合割合は、石膏原料、無
機骨材及び補強繊維よりなる原料混合物に対し外割で
０.１５〜０.３重量％、好ましくは０.１８〜０.２４重
量％の範囲内であり、この限度を超えて添加すると、数
週間以上硬化せず、また、これより少ないと製造中(成
形前)に二水化してしまい全く硬化しなくなってしま
う。As a setting retarder for hemihydrate gypsum, a combination of tartaric acid or one or more metal salts thereof and an amino acid derivative (a formaldehyde condensate of an amino acid obtained by hydrolyzing a protein) is suitable. When using hemihydrate gypsum and type II anhydrous gypsum, especially natural type II anhydrous gypsum, the setting time is greatly shortened by gypsum contained in type II anhydrous gypsum. Therefore, a larger amount of retarder must be added than in the case of conventional hemihydrate gypsum alone. The mixing ratio of the gypsum setting retarder is in the range of 0.15 to 0.3% by weight, preferably 0.18 to 0.24% by weight, based on the raw material mixture composed of the gypsum raw material, the inorganic aggregate and the reinforcing fiber. If it exceeds this limit, it will not cure for several weeks or more, and if it is less than this, it will dihydrate during production (before molding) and will not cure at all.
【００１６】以上述べた原料を混合し、更に所定量の水
を添加して濃度５〜１５重量％のスラリーを得、該スラ
リーから慣用の抄造法により得られた繊維含有石膏板は
安価で、かつ高強度となる。また、それほど高い強度を
望まない場合には、その分安価な無機骨材を増加するこ
とにより、従来の強度を保ちつつ、さらなる原料コスト
ダウンを図ることができる。The raw materials described above are mixed, and a predetermined amount of water is further added to obtain a slurry having a concentration of 5 to 15% by weight. A fiber-containing gypsum board obtained from the slurry by a conventional papermaking method is inexpensive. And it becomes high strength. Further, when a high strength is not desired, the cost of raw materials can be further reduced while maintaining the conventional strength by increasing the amount of inexpensive inorganic aggregate.
【００１７】[0017]
【作用】本発明の半水石膏とＩＩ型無水石膏を併用した
繊維含有石膏板は、半水石膏のみを使用した場合と比較
して強度が上昇し、比重、吸水による寸法変化率は減少
傾向を示す。従って、物性を維持しつつ、安価な無機質
充填材を増量することができ、それによってコスト低減
も可能になる。The strength of the fiber-containing gypsum board of the present invention in which hemihydrate gypsum and type II anhydrous gypsum are used in combination is increased as compared with the case of using hemihydrate gypsum alone, and the dimensional change rate due to specific gravity and water absorption tends to decrease. Is shown. Therefore, it is possible to increase the amount of the inexpensive inorganic filler while maintaining the physical properties, thereby making it possible to reduce the cost.
【００１８】[0018]
実施例 表１に記載する配合割合で原料を混合し、固形分５〜１
５重量％の濃度にスラリーを調整し、丸網式抄造機を用
いてスラリーを抄き取り、８０〜１００ｋｇ／ｃｍ2の
プレス圧力で脱水後、厚さ６ｍｍの成形体とした。得ら
れた成形体を湿潤状態に保ち、２日間養生を行い、硬化
体を得た。この得られた硬化体について評価を行った。Example The raw materials were mixed in the mixing ratio shown in Table 1 and the solid content was 5 to 1
The slurry was adjusted to a concentration of 5% by weight, the slurry was taken out using a round-mesh type paper making machine, and dewatered under a press pressure of 80 to 100 kg / cm 2 to obtain a molded product having a thickness of 6 mm. The obtained molded body was kept in a wet state and cured for 2 days to obtain a cured body. The obtained cured product was evaluated.
【００１９】[0019]
【表１】 [Table 1]
【００２０】表中、石膏原料割合(％)とは、原料全量に
おける石膏(半水石膏とＩＩ型無水石膏)の占める割合
(重量％)を表す。また、木質パルプはロ水度１５０ｍｌ
(カナディアン標準フリーネス)をもつものであった。更
に、硬化遅延剤としては酒石酸を使用した。次に、表中
の諸特性の測定は以下のようにして行った： 曲げ強度 硬化体を５０℃空気撹拌式乾燥機で約２４時間乾燥した
ものを中央一線荷重により曲げた。(JIS A1408 ３号試
験片) 寸法変化率 ４０×１６０ｍｍの試験片を用い、６０℃乾燥２４時間
→水浸２４時間の曲げでの寸法変化率を測定(JIS A5413
に記載された試験体)In the table, gypsum raw material ratio (%) means the ratio of gypsum (hemihydrate gypsum and type II anhydrous gypsum) to the total amount of raw materials
(% By weight). The wood pulp has a water content of 150 ml.
(Canadian standard freeness). Further, tartaric acid was used as a curing retarder. Next, the properties in the table were measured as follows: Flexural strength The cured product was dried for about 24 hours using a 50 ° C. air-stirring dryer and then bent under a central linear load. (JIS A1408 No. 3 test piece) Dimensional change rate Using a test piece of 40 × 160 mm, measure the dimensional change rate by bending at 60 ° C for 24 hours → water immersion for 24 hours (JIS A5413
(Specimen described in)
【００２１】[0021]
【発明の効果】本発明の半水石膏とＩＩ型無水石膏を併
用した繊維含有石膏板は、半水石膏のみを使用した場合
と比較して強度が上昇し、比重、吸水による寸法変化率
は減少傾向を示す。従って、物性を維持しつつ、安価な
無機骨材を増量することができ、それによってコスト低
減も可能になる。According to the present invention, the fiber-containing gypsum board using the hemihydrate gypsum and the type II anhydrous gypsum in combination has an increased strength as compared with the case where only the hemihydrate gypsum is used, and the dimensional change rate due to specific gravity and water absorption is increased. Shows a decreasing trend. Therefore, it is possible to increase the amount of inexpensive inorganic aggregate while maintaining the physical properties, thereby enabling cost reduction.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０４Ｂ 14:28 Ｃ０４Ｂ 14:28 14:06 14:06 Ｚ 16:02 16:02 Ｚ 24:04） 24:04） (56)参考文献 特開 昭53−59230（ＪＰ，Ａ) 特開 昭52−18727（ＪＰ，Ａ) 特開 昭55−5606（ＪＰ，Ａ) 特開 平３−271146（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 2/00 - 32/02 C04B 40/00 - 40/06 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI C04B 14:28 C04B 14:28 14:06 14:06 Z 16:02 16:02 Z 24:04) 24:04) (56 References JP-A-53-59230 (JP, A) JP-A-52-18727 (JP, A) JP-A-55-5606 (JP, A) JP-A-3-271146 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) C04B 2/00-32/02 C04B 40/00-40/06
Claims (2)
り１０〜４０重量部のＩＩ型無水石膏よりなる石膏原料
６０〜９７重量％、木質パルプ２〜１０重量％、及び炭
酸カルシウム、珪石粉またはそれら両者１０〜３０重量
％を主成分とすることを特徴とする繊維含有石膏抄造
板。1. Hemihydrate gypsum and 100 parts by weight of hemihydrate gypsum
Gypsum raw material comprising 10 to 40 parts by weight of type II anhydrous gypsum
60-97% by weight,Wood pulp2 to 10% by weight, andCharcoal
Calcium acid, silica powder or both 10-30weight
% Gypsum, characterized in that the main component is gypsumPapermaking
Board.
り１０〜４０重量部のＩＩ型無水石膏よりなる石膏原料
６０〜９７重量％、木質パルプ２〜１０重量％、及び炭
酸カルシウム、珪石粉またはそれら両者１０〜３０重量
％を含有してなる原料混合物に、外割で０．１５〜０．
３重量％の石膏硬化遅延剤及び所定量の水を添加してス
ラリーを得、得られたスラリーを抄造法により抄造する
ことを特徴とする繊維含有石膏抄造板の製造方法。2. Gypsum raw material consisting of hemihydrate gypsum and 10 to 40 parts by weight of type II anhydrous gypsum per 100 parts by weight of hemihydrate gypsum, 2 to 10% by weight of wood pulp , and charcoal
In a raw material mixture containing 10 to 30 % by weight of calcium acid, silica powder or both of them , 0.15 to 0.
3 was added% by weight of gypsum retarder and a predetermined amount of water to obtain a slurry, method of manufacturing a fiber-containing gypsum papermaking plate resulting slurry characterized by papermaking by papermaking method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7182393A JP3293938B2 (en) | 1993-03-30 | 1993-03-30 | Fiber-containing gypsum board and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7182393A JP3293938B2 (en) | 1993-03-30 | 1993-03-30 | Fiber-containing gypsum board and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06279087A JPH06279087A (en) | 1994-10-04 |
| JP3293938B2 true JP3293938B2 (en) | 2002-06-17 |
Family
ID=13471667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7182393A Expired - Lifetime JP3293938B2 (en) | 1993-03-30 | 1993-03-30 | Fiber-containing gypsum board and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3293938B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5596933B2 (en) * | 2008-03-31 | 2014-09-24 | 株式会社エーアンドエーマテリアル | Method for producing gypsum-based molded body |
| JP5758917B2 (en) * | 2010-02-08 | 2015-08-05 | クナウフ ギプス カーゲー | Gypsum board and method for producing gypsum board |
| JP2013224251A (en) * | 2012-03-21 | 2013-10-31 | Tokuyama Corp | Gypsum powder, and method for manufacturing gypsum molding |
| JP5659192B2 (en) * | 2012-05-18 | 2015-01-28 | 株式会社ノリタケカンパニーリミテド | 3D modeling powder and 3D modeling |
-
1993
- 1993-03-30 JP JP7182393A patent/JP3293938B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06279087A (en) | 1994-10-04 |
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