JPH07214529A - Manufacture of inorganic cement board - Google Patents
Manufacture of inorganic cement boardInfo
- Publication number
- JPH07214529A JPH07214529A JP794794A JP794794A JPH07214529A JP H07214529 A JPH07214529 A JP H07214529A JP 794794 A JP794794 A JP 794794A JP 794794 A JP794794 A JP 794794A JP H07214529 A JPH07214529 A JP H07214529A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- cement
- green sheet
- curing
- aggregate
- 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.)
- Withdrawn
Links
- 239000004568 cement Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000012615 aggregate Substances 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 238000000748 compression moulding Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- -1 shirasu balloon Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は外装材等の建築材料とし
て用いられる無機質セメント板の製造方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic cement board used as a building material such as an exterior material.
【０００２】[0002]
【従来の技術】従来から、無機質セメント板は、ハチェ
ック抄造法または長網抄造法等の抄造方式か、或いは押
出成形か注型成形かのいずれかの方式で製造されてい
る。このうち、抄造方式による無機質セメント板の製造
方法が生産性に優れているために一般によく行われてい
るが、この抄造方式によって形成されたグリーンシート
を加圧成形して凹凸模様を付与した後、養生硬化して得
られる無機質セメント板の表面には、深く鋭い凹凸模様
を形成することが困難であるという欠点があった。この
欠点を解消するために、上記グリーンシートを第１層と
して、その上面にセメントを主成分とする流動性に乏し
い、含水率が約５０重量％以下のペースト状の粉体混合
材料を載せて第２層を形成して複層板とし、この複層板
を加圧成形してこの第２層に所望の凹凸模様を形成し、
これを養生硬化する方法が採用された。ここで第２層に
粉体混合材料を用いる理由は、含水率が高いと凹凸模様
を付与した後に、第２層に含まれる骨材、あるいはセメ
ントが流動し、凹凸模様が型崩れするからである。さら
に凹凸模様に型崩れの生じない複層板中のセメントの水
硬反応を促進するために、上記養生は湿熱状態で養生す
ることによって第１層と第２層の均一な硬化を行うステ
ップと、このステップの後にさらに硬化を完結するため
に、オートクレーブ中で強制的に養生するステップが採
用された。2. Description of the Related Art Conventionally, an inorganic cement board has been manufactured by a paper-making method such as a Haschek paper-making method or a Fourdrinier-paper-making method, or an extrusion molding method or a cast molding method. Among them, the method for producing an inorganic cement plate by the papermaking method is generally performed because it is excellent in productivity, but after the green sheet formed by this papermaking method is pressure-molded to give an uneven pattern However, there is a drawback in that it is difficult to form a deep and sharp uneven pattern on the surface of the inorganic cement board obtained by curing and hardening. In order to solve this drawback, the above green sheet is used as a first layer, and a paste-like powder mixed material containing cement as a main component and poor in fluidity and having a water content of about 50% by weight or less is placed on the upper surface thereof. The second layer is formed into a multi-layer plate, and the multi-layer plate is pressure-molded to form a desired uneven pattern on the second layer,
A method of curing and curing this was adopted. The reason why the powder mixed material is used for the second layer is that the aggregate or the cement contained in the second layer flows when the moisture content is high and then the uneven pattern is given, and the uneven pattern loses its shape. is there. Further, in order to accelerate the hydraulic reaction of the cement in the multi-layered board in which the shape of the concavo-convex pattern does not collapse, the above curing is performed in a wet heat state to uniformly cure the first layer and the second layer. After this step, a forced curing step in the autoclave was used to further complete the cure.
【０００３】ところが、湿熱状態での養生でもって第１
層と第２層に生じる硬化反応の反応速度は、含水率の差
からして異なるために反応率を同一とするには長時間を
要する。したがって、湿熱状態での養生によって得られ
た硬化未完の無機質セメント板を、オートクレーブ中で
養生すると第１層と第２層の反応率の差から反りが発生
する問題がある。However, it is the first because of curing in a moist heat condition.
Since the reaction rates of the curing reactions occurring in the first layer and the second layer are different due to the difference in water content, it takes a long time to make the reaction rates the same. Therefore, when an unhardened inorganic cement board obtained by curing in a wet heat state is cured in an autoclave, there is a problem that warpage occurs due to a difference in reaction rate between the first layer and the second layer.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上述の如
く、セメントと骨材と繊維成分を主成分とした水性スラ
リーを抄造してグリーンシートを形成し、このグリーン
シートを第１層としてその上面に、セメントと骨材と繊
維成分を主成分とする、含水率が５０重量％以下のペー
スト状の粉体混合材料を載せて第２層を形成して複層板
とし、この複層板を加圧成形して上記第２層の上面に凹
凸模様を形成し、これを湿熱状態で一次養生した後、さ
らにオートクレーブ中で二次養生することを特徴とする
無機質セメント板の製造方法を採用するに当たって、オ
ートクレーブ中での二次養生によって生ずる反りの問題
を解消した無機質セメント板の製造方法を提供するもの
である。DISCLOSURE OF THE INVENTION The present invention, as described above, forms a green sheet by making an aqueous slurry containing cement, aggregate and fiber components as main components, and uses this green sheet as the first layer. On the upper surface, a paste-like powder mixed material containing cement, aggregate, and fiber components as main components and having a water content of 50% by weight or less is placed to form a second layer to form a multi-layer board. Is pressure-molded to form a concavo-convex pattern on the upper surface of the second layer, which is first cured in a moist heat state, and then secondarily cured in an autoclave, which is a method for producing an inorganic cement board. In doing so, the present invention provides a method for producing an inorganic cement board that solves the problem of warpage caused by secondary curing in an autoclave.
【０００５】[0005]
【課題を解決するための手段】本発明の無機質セメント
板の製造方法は、セメントと骨材と繊維成分を主成分と
した水性スラリーを抄造してグリーンシートを形成し、
このグリーンシートを第１層としてその上面に、セメン
トと骨材と繊維成分を主成分とする、含水率が５０重量
％以下のペースト状の粉体混合材料を載せて第２層を形
成して複層板とし、この複層板を加圧成形して上記第２
層の上面に凹凸模様を形成し、これを湿熱状態で一次養
生した後、上記第２層の上面に水を散布し、さらにオー
トクレーブ中で二次養生することを特徴とする。Means for Solving the Problems A method for producing an inorganic cement board of the present invention comprises forming an aqueous slurry containing cement, an aggregate and a fiber component as main components to form a green sheet,
This green sheet is used as a first layer, and a paste-like powder mixed material containing cement, aggregate and fiber components as main components and having a water content of 50% by weight or less is placed on the upper surface to form a second layer. A multi-layer plate is formed, and the multi-layer plate is pressure-molded to form the second plate.
It is characterized in that a concavo-convex pattern is formed on the upper surface of the layer, primary curing is performed in a wet heat state, water is sprinkled on the upper surface of the second layer, and then secondary curing is performed in an autoclave.
【０００６】[0006]
【作用】本発明の無機質セメント板の製造方法による
と、湿熱状態での一次養生と、オートクレーブ中での二
次養生との間に、一次養生を経た硬化が未完の無機質セ
メント板の第２層に散水することによって、第１層に含
まれる含水率との均衡をはかって第２層の水硬反応を促
進させることによって、反応率を高める。したがって、
第１層と第２層の反応率は接近する。なお、散水を湿熱
状態での一次養生後であって、一次養生前にしないの
は、一次養生前に散水すると、前述の如く、第２層が流
動性を帯び、凹凸模様が型崩れするからである。According to the method for producing an inorganic cement board of the present invention, the second layer of the unhardened inorganic cement board that has undergone the primary curing between the primary curing in the wet heat state and the secondary curing in the autoclave. By sprinkling water on the second layer, the reaction rate is enhanced by balancing the water content contained in the first layer and promoting the hydraulic reaction of the second layer. Therefore,
The reaction rates of the first layer and the second layer are close to each other. It should be noted that the reason why the sprinkling is not performed before the primary curing after the primary curing in the wet heat state is that if the watering is performed before the primary curing, the second layer becomes fluid and the uneven pattern is deformed as described above. Is.
【０００７】以下、本発明を詳しく説明する。まず、加
圧成形される複層板について説明すると、複層板は第１
層とこの第１層に載った第２層から構成される。第１層
は、セメントをバインダーとし、骨材、その他補強のた
めに各種繊維成分を主成分として含んだ水性スラリーを
抄造して得られるグリーンシートで構成される。上記セ
メントとしては、ポルトランドセメント、高炉セメント
等、フライアッシュセメント等を用いることができる。
上記骨材としては特に限定はなく、目的とする無機質セ
メント板の用途に応じて一般に用いられる鉱物性骨材が
用いられる。例えば、建築材料の外装板に適用する場合
には、ケイ石粉、パーライト、シラスバルーン、ガラス
バルーン、シリカ、砂利などが用いられる。上記繊維成
分としては、セルロース系のパルプ繊維、石綿等の鉱物
性繊維、ポリプロピレン、ビニロン等有機質の樹脂系繊
維、ガラス繊維、炭素繊維、金属繊維等が用いられる。
上記第１層は第２層と比べると、含水率がきわめて高
く、仮に凹凸模様を加圧成形で付与しても、解圧すると
経時とともに型崩れする性質を有するものである。The present invention will be described in detail below. First, the multi-layer plate to be pressure-molded will be described.
It is composed of a layer and a second layer on the first layer. The first layer is composed of a green sheet obtained by making an aqueous slurry containing cement as a binder and various fiber components as main components for reinforcement. As the cement, Portland cement, blast furnace cement, fly ash cement or the like can be used.
The above-mentioned aggregate is not particularly limited, and a mineral aggregate generally used depending on the intended use of the inorganic cement board is used. For example, when applied to the exterior plate of a building material, silica stone powder, perlite, shirasu balloon, glass balloon, silica, gravel, etc. are used. As the fiber component, cellulose-based pulp fiber, mineral fiber such as asbestos, organic resin fiber such as polypropylene and vinylon, glass fiber, carbon fiber, metal fiber and the like are used.
The first layer has an extremely high water content as compared with the second layer, and even if a concavo-convex pattern is applied by pressure molding, the first layer has a property of losing its shape over time when decompressed.
【０００８】上記第２層について説明すると、材料面か
ら言及すると基本的には差異はなく、セメント、骨材、
繊維成分を主成分とし、含水率が５０重量％以下であっ
て、凹凸模様を付与すると、解圧しても凹凸模様の崩れ
はなく、けいじょうの自己保持性に優れた性質をもっ
た、混練されたペースト状の粉体混合材料が用いられ
る。この混練された粉体混合材料を第１層のグリーンシ
ート上にノズルから供給して第２層を形成し、その結
果、複層板が形成される。Explaining the above-mentioned second layer, there is basically no difference in terms of materials, and cement, aggregate,
Kneading with a fiber component as the main component, a water content of 50% by weight or less, and when an uneven pattern is imparted, the uneven pattern does not collapse even when decompressed, and the kneading has excellent self-holding properties. The pasty powdered mixed material is used. The kneaded powder mixed material is supplied from the nozzle onto the green sheet of the first layer to form the second layer, and as a result, the multilayer plate is formed.
【０００９】この複層板を加圧成形して第２層に凹凸模
様を形成し、これに前述の如く、湿熱状態の一次養生を
施す。湿熱状態の一次養生は、５０℃以上の飽和水蒸気
で満たされた養生室に放置してなされる。水蒸気雰囲気
中での養生であるので、水硬反応は局所的な進行はな
く、均一に進行する。一次養生によって、相当に水硬反
応が進んだ硬質の無機質セメント板が得られる。この無
機質セメント板の凹凸模様はもはや水に接触しても型崩
れすることもなく一定の形状を保持するだけの硬化物で
はあるが、水硬反応は完結した状態に達していない、未
反応のセメントが残ったものである。次に、この無機質
セメント板に散水すると水は凹凸模様を付与した第２層
に吸収される。このステップでの散水は１乃至１０リッ
トル／ｍ2の割合で行われればよく、３乃至８リットル
／ｍ2 で行われるのがさらに好ましい。水の散布量が１
リットル／ｍ2 未満では十分な反り防止効果が得られ
ず、１０リットル／ｍ2 を越えると、第２層が吸収する
許容以上の水が余剰水となって流れ落ちる。水硬反応に
十分な水がこのステップで加えられる。この吸収された
水によって未反応セメントの水硬反応は次の工程の二次
養生によって急速に進行する。この二次養生はオートク
レーブ中でなされる。すなわち高温高圧下で強制的に水
硬反応が促進され、反応は完結する。This multi-layer plate is pressure-molded to form a concavo-convex pattern on the second layer, and this is subjected to the primary curing in a wet heat state as described above. The primary curing in the wet heat state is performed by leaving it in a curing chamber filled with saturated steam at 50 ° C. or higher. Since the curing is carried out in a steam atmosphere, the hydraulic reaction does not locally proceed but progresses uniformly. By the primary curing, a hard inorganic cement board with considerably advanced hydraulic reaction can be obtained. The concave-convex pattern of this inorganic cement plate is a cured product that does not lose its shape even when it comes into contact with water, but retains a certain shape, but the hydraulic reaction does not reach a completed state, The cement remains. Next, when water is sprinkled on the inorganic cement board, the water is absorbed by the second layer having an uneven pattern. The water sprinkling in this step may be performed at a rate of 1 to 10 liter / m 2 , and more preferably 3 to 8 liter / m 2 . The amount of water sprayed is 1
If it is less than 1 liter / m 2 , sufficient warp prevention effect cannot be obtained, and if it exceeds 10 liter / m 2 , water beyond the allowable level absorbed by the second layer becomes excess water and flows down. Sufficient water for the hydraulic reaction is added in this step. Due to the absorbed water, the hydraulic reaction of the unreacted cement rapidly proceeds by the secondary curing in the next step. This secondary curing is done in an autoclave. That is, the hydraulic reaction is forcibly promoted under high temperature and high pressure, and the reaction is completed.
【００１０】[0010]
【実施例】以下、本発明を実施例として説明する。EXAMPLES The present invention will be described below with reference to examples.
【００１１】グリーンシートの作成 ポルトランドセメント４０重量％、フライアッシュセメ
ント４０重量％、ケイ石粉１５重量％、及びパルプ５重
量％を水に分散させて水性スラリーを調製し、この水性
スラリーを長網抄造法にて抄造してグリーンシートを作
製した。このグリーンシートを下記の実施例及び比較例
に用いた。Preparation of Green Sheet 40% by weight of Portland cement, 40% by weight of fly ash cement, 15% by weight of silica stone, and 5% by weight of pulp are dispersed in water to prepare an aqueous slurry. A green sheet was manufactured by the method. This green sheet was used in the following examples and comparative examples.
【００１２】実施例１乃至実施例３ 実施例１乃至実施例３それぞれについて、ポルトランド
セメント、ケイ石粉、着色軽量骨材、パーライト、及び
パルプを（表１）に示した配合量に従って水と混合し、
含水率が約４０重量％のペースト状の粉体混合材料を調
製した。ここで、上記着色軽量骨材としては、実施例１
及び実施例２には着色流紋岩粒体を使用し、実施例３に
は粘土瓦粒体を使用した。この粉体混合材料を、上述の
如くして得たグリーンシートを第１層として、このグリ
ーンシートの上面にノズルから供給して第２層を形成
し、複層板を得た。この複層板をプレス機にて加圧成形
して上記第２層に凹凸模様を形成した後、８０℃の湿熱
状態に保たれた養生室で２０時間放置して一次養生を施
し、無機質セメント板の一次養生品を得た。この無機質
セメント板の一次養生品に、第２層の上面から水を散布
した後、オートクレーブ中で１７０℃−１０時間の条件
で二次養生し、完成した無機質セメント板を得た。実施
例１乃至実施例３それぞれについて、上記の水の散布量
を（表２）に示した。Examples 1 to 3 For each of Examples 1 to 3, Portland cement, silica stone powder, colored lightweight aggregate, pearlite, and pulp were mixed with water according to the blending amounts shown in (Table 1). ,
A paste-like powdery mixed material having a water content of about 40% by weight was prepared. Here, as the colored lightweight aggregate, Example 1 was used.
The colored rhyolite granules were used in Example 2 and the clay tile granules were used in Example 3. The green sheet obtained as described above was used as the first layer, and the powder mixed material was supplied from the nozzle to the upper surface of the green sheet to form the second layer, whereby a multilayer plate was obtained. This multi-layer board is pressure-molded with a press machine to form a concavo-convex pattern on the second layer, and then left to stand in a curing room kept at 80 ° C for 20 hours for primary curing to obtain an inorganic cement. The primary curing product of the board was obtained. Water was sprayed from the upper surface of the second layer to the primary curing product of this inorganic cement plate, and then secondary curing was performed in an autoclave at 170 ° C. for 10 hours to obtain a completed inorganic cement plate. The amount of water sprayed for each of Examples 1 to 3 is shown in (Table 2).
【００１３】比較例１乃至比較例３ 比較例１乃至比較例３それぞれについて、上記実施例と
同様に、ポルトランドセメント、ケイ石粉、着色軽量骨
材、パーライト、及びパルプを（表１）に示した配合量
に従って水と混合し、含水率が約４０重量％のペースト
状の粉体混合材料を調製した。ここで、上記着色軽量骨
材としては、比較例１及び比較例２には着色流紋岩粒体
を使用し、比較例３には粘土瓦粒体を使用した。この粉
体混合材料を、上述の如くして得たグリーンシートを第
１層として、このグリーンシートの上面にノズルから供
給して第２層を形成し、複層板を得た。この複層板をプ
レス機にて加圧成形して上記第２層に凹凸模様を形成し
た後、８０℃の湿熱状態に保たれた養生室で２０時間放
置して一次養生を施し、無機質セメント板の一次養生品
を得た。比較例においては、この無機質セメント板の一
次養生品に水を散布しないで、オートクレーブ中で１７
０℃−１０時間の条件で二次養生し、完成した無機質セ
メント板を得た。Comparative Examples 1 to 3 For each of Comparative Examples 1 to 3, portland cement, silica powder, colored lightweight aggregate, pearlite, and pulp are shown in Table 1 as in the above examples. According to the blending amount, it was mixed with water to prepare a pasty powdery mixed material having a water content of about 40% by weight. Here, as the colored lightweight aggregate, colored rhyolite granules were used in Comparative Examples 1 and 2, and clay tile granules were used in Comparative Example 3. The green sheet obtained as described above was used as the first layer, and the powder mixed material was supplied from the nozzle to the upper surface of the green sheet to form the second layer, whereby a multilayer plate was obtained. This multi-layer board is pressure-molded with a press machine to form a concavo-convex pattern on the second layer, and then left to stand in a curing room kept at 80 ° C for 20 hours for primary curing to obtain an inorganic cement. The primary curing product of the board was obtained. In the comparative example, water was not sprayed on the primary curing product of this inorganic cement board, and it was used in an autoclave.
Secondary curing was performed under the condition of 0 ° C. for 10 hours to obtain a completed inorganic cement board.
【００１４】[0014]
【表１】 [Table 1]
【００１５】反り量の測定 上述の如くして得た実施例及び比較例の無機質セメント
板を、それぞれ寸法３００ｍｍ×３００ｍｍに切断して
試料片とし、この試料片を平滑な板の上に載せて、この
ときにできる上記試料片と板との間隔の最大幅を測定し
て反り量とした。測定した反り量を（表２）に示した。Measurement of Warp Amount The inorganic cement boards of Examples and Comparative Examples obtained as described above were cut into pieces of 300 mm × 300 mm in size to prepare sample pieces, and the sample pieces were placed on a smooth board. The maximum width of the space between the sample piece and the plate that was formed at this time was measured and defined as the amount of warpage. The measured warpage amount is shown in (Table 2).
【００１６】[0016]
【表２】 [Table 2]
【００１７】表２より、水の散布処理をした実施例の無
機質セメント板は、比較例の無機質セメント板に比べる
と、反り量が大幅に低減されていることがわかる。From Table 2, it can be seen that the amount of warpage of the inorganic cement board of the example treated with water is greatly reduced as compared with the inorganic cement board of the comparative example.
【００１８】[0018]
【発明の効果】本発明の無機質セメント板の製造方法に
よると、セメントと骨材と繊維成分を主成分とした水性
スラリーを抄造してグリーンシートを形成し、このグリ
ーンシートを第１層としてその上面に、セメントと骨材
と繊維成分を主成分とする、含水率が５０重量％以下の
粉体混合材料を載せて第２層を形成して複層板とし、こ
の複層板を加圧成形して上記第２層の上面に凹凸模様を
形成し、これを湿熱状態で一次養生した後、さらにオー
トクレーブ中で二次養生することを特徴とする無機質セ
メント板の製造方法を採用する場合において、一次養生
した後、二次養生する前に、上記第２層の上面に水を散
布するので、オートクレーブ中での二次養生によって生
ずる反りを大幅に低減する防止することができる。According to the method for producing an inorganic cement board of the present invention, an aqueous slurry containing cement, aggregate and fiber components as main components is formed into a green sheet, and the green sheet is used as the first layer. On the upper surface, a powder mixture material containing cement, aggregate, and fiber components as main components and having a water content of 50% by weight or less is placed to form a second layer to form a multi-layer plate, and the multi-layer plate is pressed. In the case of adopting a method for producing an inorganic cement board, which comprises molding to form a concavo-convex pattern on the upper surface of the second layer, primary curing this in a wet heat state, and then secondary curing in an autoclave. Since water is sprayed on the upper surface of the second layer after the primary curing and before the secondary curing, it is possible to prevent the warp caused by the secondary curing in the autoclave from being significantly reduced.
Claims (3)
た水性スラリーを抄造してグリーンシートを形成し、こ
のグリーンシートを第１層としてその上面に、セメント
と骨材と繊維成分を主成分とする、含水率が５０重量％
以下のペースト状の粉体混合材料を載せて第２層を形成
して複層板とし、この複層板を加圧成形して上記第２層
の上面に凹凸模様を形成し、これを湿熱状態で一次養生
した後、上記第２層の上面に水を散布し、さらにオート
クレーブ中で二次養生することを特徴とする無機質セメ
ント板の製造方法。1. A green sheet is formed by making an aqueous slurry containing cement, aggregate and fiber components as main components, and the green sheet is used as a first layer on the upper surface of which cement, aggregate and fiber components are mainly contained. Moisture content of 50% by weight
The following paste-like powder mixed material is placed to form a second layer to form a multi-layer plate, and the multi-layer plate is pressure-molded to form a concavo-convex pattern on the upper surface of the second layer. A method for producing an inorganic cement board, which comprises primary curing in a state, spraying water on the upper surface of the second layer, and then secondary curing in an autoclave.
行われることを特徴とする請求項１記載の無機質セメン
ト板の製造方法。2. The method for producing an inorganic cement board according to claim 1, wherein the primary curing is performed in a wet heat condition of 50 ° C. or higher.
１乃至１０リットル／ｍ2 であることを特徴とする請求
項１又は請求項２記載の無機質セメント板の製造方法。3. The amount of water sprayed on the upper surface of the second layer is
The method for producing an inorganic cement board according to claim 1 or 2 , wherein the amount is 1 to 10 liters / m 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP794794A JPH07214529A (en) | 1994-01-27 | 1994-01-27 | Manufacture of inorganic cement board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP794794A JPH07214529A (en) | 1994-01-27 | 1994-01-27 | Manufacture of inorganic cement board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07214529A true JPH07214529A (en) | 1995-08-15 |
Family
ID=11679697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP794794A Withdrawn JPH07214529A (en) | 1994-01-27 | 1994-01-27 | Manufacture of inorganic cement board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07214529A (en) |
-
1994
- 1994-01-27 JP JP794794A patent/JPH07214529A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010403 |