JP4174152B2 - Manufacturing method of inorganic building materials - Google Patents
Manufacturing method of inorganic building materials Download PDFInfo
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- JP4174152B2 JP4174152B2 JP36089799A JP36089799A JP4174152B2 JP 4174152 B2 JP4174152 B2 JP 4174152B2 JP 36089799 A JP36089799 A JP 36089799A JP 36089799 A JP36089799 A JP 36089799A JP 4174152 B2 JP4174152 B2 JP 4174152B2
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- Prior art keywords
- inorganic
- crack
- raw plate
- drying
- groove
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- 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.)
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- Panels For Use In Building Construction (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Description
【0001】
【発明の属する技術分野】
この出願の発明は、無機質建材の製造方法に関するものである。さらに詳しくは、この出願の発明は、養生又は乾燥時に無機質原板に発生するクラックを、材料に無駄を生じさせることなく、また、生産性を良好に保持しつつ抑制し、製品部への進展を防止することのできる無機質建材の製造方法に関するものである。
【0002】
【従来の技術】
従来より、建物の外壁材、屋根材等の外装材として、セメント板をはじめとする各種無機質板が広く用いられている。この無機質板は、例えば、セメント等の水硬性材料及び水を主成分とするスラリーをウェットマシーン等で抄き取り、無機質原板を作製した後に、脱水、養生、乾燥などの操作を経て製造されている。
【0003】
養生又は乾燥して水分調整が行われる際に、無機質原板には、その端部と中央部の間の含水率差、温度差等に起因して歪みが生じ、その結果、例えば図2に示したように、無機質原板の端部(1)から内側に向かってクラック(2)がしばしば発生していた。無機質原板は、一般に、製品より大きなサイズに作製され、端部(1)は、後に切断、切削等により除去されるようにしているが、クラック(2)は、時として無機質原板の端部(1)を超えて後に製品となる製品部(3)にまで達することがある。このようにクラック(2)が製品部(3)まで進展すると、製品としての外観が低下するばかりでなく、強度、耐久性、耐火性等の各種性能にも影響を及ぼすため、その対策が検討されている。
【0004】
例えば、無機質原板のサイズをクラック(2)が到達しないと想定されるサイズまで拡大したり、あるいは養生温度又は乾燥温度をできる限り低く設定する等が考えられている。
【0005】
【発明が解決しようとする課題】
しかしながら、前者には、製品部(3)ではない部分が拡大されることから材料の無駄が指摘される。後者については、温度低下により養生又は乾燥に長時間を要することとなり、生産性の低下が問題視される。
【0006】
この出願の発明は、以上の通りの事情に鑑みてなされたものであり、養生又は乾燥時に無機質原板に発生するクラックを、材料に無駄を生じさせることなく、また、生産性を良好に保持しつつ抑制し、製品部への進展を防止することのできる無機質建材の製造方法を提供することを目的としている。
【0007】
【課題を解決するための手段】
この出願の発明は、上記の課題を解決するものとして、内側に製品部を有しその周縁に周縁部が形成されている無機質原板を養生又は乾燥するに先立って、その表裏いずれかの面の周縁部に、端縁から30〜50mm内側に、幅2〜5mm、無機質原板の厚みの1割から5割までの深さを有するクラック進展防止溝を1本若しくは複数本設け、養生又は乾燥時に無機質原板に生じるクラックをそのクラック進展防止溝において分散させて、周縁部の内側に位置する製品部へのクラック進展を防止することを特徴とする無機質建材の製造方法(請求項1)を提供する。
【0008】
以下、図面に沿ってこの出願の発明の無機質建材の製造方法についてさらに詳しく説明する。
【0009】
【発明の実施の形態】
図1<a><b>は、各々、この出願の発明の無機質建材の製造方法の概要を示した平面図、A−A断面図である。
【0010】
例えばこの図1に示したように、この出願の発明の無機質建材の製造方法では、無機質原板を養生又は乾燥するに先立って、その表裏いずれかの面の周縁部(4)に1本若しくは複数本の溝(5)を設け、養生又は乾燥時に無機質原板に生じるクラック(2)をその溝(5)において分散させる。このため、無機質原板の内側に位置する製品部(3)にまでクラック(2)が進展するのを抑制することができる。従って、無機質原板のサイズを特に拡大する必要はなく、所定のサイズのままとすることができる。無機質原板のサイズを拡大することに伴う材料の無駄が解消される。しかも、養生温度又は乾燥温度は通常通りでよく、ことさら低く設定する必要もない。従って、無機質建材の生産性は良好に保持される。
【0011】
このように無機質原板の表裏いずれかの面の周縁部(4)に設けられる溝(5)については、その本数は特に制限はなく、前記の通り、1本若しくは複数本とすることができ、無機質原板の材料、性状等に応じて適宜定めることができる。一般に、クラック(2)が発生しやすい無機質原板に対しては2本以上、より具体的には数本並設するのが好ましい。これは、クラック(2)がより拡散しやすくなるからである。
【0012】
溝(5)の形状は、断面V字型、断面U字型等とすることができ、特に制限はない。溝(5)の位置は、無機質原板の端縁より30〜50mm内側とする。幅は、2〜5mm とする。
【0013】
一方、溝(5)の深さについては、無機質原板の厚みの1割から5割までとする。溝(5)の深さが無機質原板の厚みの1割未満であると、クラック(2)が十分に分散しなくなり、製品部(3)に進展する場合がある。5割を超えると、溝(5)が深くなり過ぎ、無機質原板の強度特性等によってはクラック(2)が製品部(3)にまで及ぶことがある。
【0014】
溝(5)の形成方法としては、例えば、養生又は乾燥前の未硬化状態にある無機質原板の表面又は裏面に成形型を接触させ、加圧成形したり、やや硬化のはじまった状態においてルーター等により無機質原板の表面又は裏面を切削加工する等が例示される。前者の場合、模様付けと同時に溝(5)を形成することができ、作業効率に優れる。いずれにしても、溝(5)の形成方法は、無機質原板の製造方法に応じ、生産性を考慮して適宜に選択することができる。
【0015】
なお、この出願の発明の無機質建材の製造方法が対象とする無機質建材については、特にその種類は問わない。水硬性材料及び水を主成分とするスラリーから形成されるものであればよく、例えば、繊維補強セメント板、石膏ボード、ALCパネル等が例示される。
【0016】
【実施例】
(実施例1〜3、比較例1〜2)
無機質建材として繊維補強セメント板を選定し、表1に示した組成を有する繊維補強セメント原板を抄造により作製した。サイズは、幅1100mm(製品部幅1000mm)、長さ3100mm(製品部長さ3000mm)、厚み25mmとした。この繊維補強セメント原板に対し、実施例1〜3、比較例2ではその周縁部に、繊維補強セメント原板の端縁から50mm内側の位置に、幅3mmの断面V字型の溝を表2に示した本数及び深さで設けた。一方、比較例1では溝は全く設けなかった。
【0017】
これらの繊維補強セメント原板を温度240℃で25分間乾燥し、クラックの発生状況を観察した。その結果を表2に合わせて示した。
【0018】
【表1】
【0019】
【表2】
【0020】
実施例1、2及び3では、クラックは、繊維補強セメント原板の周縁部にとどまり、製品部には進展していない。これに対し、比較例1では、クラックは製品部にまで及んでいる。繊維補強セメント原板の周縁部に溝を設けることにより、クラックの製品部への進展が防止されることが確認される。
【0021】
比較例2では、クラックは、比較例1に比べその進展が抑制されているが、製品部にまで達している。溝の深さが繊維補強セメント原板の厚みの5割を超えたためである。表1に示した組成の繊維補強セメント原板では、製品部にクラックが生じないためには溝の深さは5割を超えないことがよいことが確認される。
【0022】
勿論、この出願の発明は、以上の実施形態並びに実施例に限定されるものではない。無機質建材の種類、溝の形状、幅、深さ、位置等の細部については様々な態様が可能であることは言うまでもない。
【0023】
【発明の効果】
以上詳しく説明した通り、この出願の発明によって、養生又は乾燥時に無機質原板に発生するクラックを、材料に無駄を生じさせることなく、また、生産性を良好に保持しつつ抑制し、製品部への進展を防止することが可能となる。
【図面の簡単な説明】
【図1】<a><b>は、各々、この出願の発明の無機質建材の製造方法の概要を示した平面図、A−A断面図である。
【図2】無機質原板に発生するクラックの様子を例示した平面図である。
【符号の説明】
1 端部
2 クラック
3 製品部
4 周縁部
5 溝[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to a method for producing an inorganic building material. More specifically, the invention of this application relates to a crack that occurs in an inorganic raw plate during curing or drying without causing waste in the material, and while maintaining good productivity, and progressing to the product part. The present invention relates to a method for producing an inorganic building material that can be prevented.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various inorganic boards including cement boards have been widely used as exterior materials for building outer wall materials and roofing materials. This inorganic board is manufactured through operations such as dehydration, curing, and drying after a slurry made of a hydraulic material such as cement and water as a main component is drawn up by a wet machine, etc. Yes.
[0003]
When moisture adjustment is performed by curing or drying, the inorganic raw plate is distorted due to a moisture content difference between the end portion and the center portion, a temperature difference, and the like. As a result, for example, as shown in FIG. As described above, cracks (2) often occurred inward from the end (1) of the inorganic base plate. In general, the inorganic original plate is produced in a size larger than that of the product, and the end (1) is later removed by cutting, cutting, or the like, but the crack (2) sometimes becomes an end of the inorganic original plate ( In some cases, the product part (3) that becomes a product after 1) is reached. When crack (2) progresses to product part (3) in this way, not only the appearance of the product deteriorates, but also affects various performances such as strength, durability, and fire resistance. Has been.
[0004]
For example, it is considered to increase the size of the inorganic raw plate to a size that the crack (2) is assumed not to reach, or to set the curing temperature or the drying temperature as low as possible.
[0005]
[Problems to be solved by the invention]
However, the former is pointed out as a waste of material because the portion that is not the product part (3) is enlarged. The latter requires a long time for curing or drying due to a decrease in temperature, and a decrease in productivity is regarded as a problem.
[0006]
The invention of this application was made in view of the circumstances as described above, and cracks generated in the inorganic raw plate during curing or drying do not cause waste in the material, and also maintain good productivity. It aims at providing the manufacturing method of the inorganic building material which can suppress and prevent the progress to a product part.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of this application is directed to curing or drying an inorganic raw plate having a product part on the inside and a peripheral part on the periphery thereof, on either the front or back side. At the peripheral edge, one or more crack progress prevention grooves having a width of 2 to 5 mm and a depth of 10 to 50% of the thickness of the inorganic raw plate are provided 30 to 50 mm inside from the edge, and during curing or drying cracks occurring mineral original plate is dispersed in the crack extension preventing groove, provides a method for manufacturing inorganic building materials, characterized that you prevent crack propagation to the product portion (claim 1) located inside of the peripheral portion To do.
[0008]
Below, a method for manufacturing the inorganic building material of the invention of this application will be described in more detail with reference to the drawings.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 <a><b> are respectively a plan view and a cross-sectional view taken along line AA showing an outline of a method for producing an inorganic building material of the invention of this application.
[0010]
For example, as shown in FIG. 1, in the manufacturing method of an inorganic building material of the invention of this application, prior to curing or drying the inorganic raw plate, one or more are provided on the peripheral edge (4) on either the front or back surface. The groove | channel (5) of a book is provided, and the crack (2) which arises in an inorganic original plate at the time of curing or drying is disperse | distributed in the groove | channel (5). For this reason, it can suppress that a crack (2) progresses to the product part (3) located inside an inorganic raw material board. Therefore, it is not necessary to enlarge the size of the inorganic raw plate, and the predetermined size can be maintained. Material waste associated with enlarging the size of the inorganic substrate is eliminated. In addition, the curing temperature or the drying temperature may be as usual, and it is not necessary to set it to be particularly low. Therefore, the productivity of the inorganic building material is maintained well.
[0011]
As described above, the number of the grooves (5) provided in the peripheral edge (4) on either of the front and back surfaces of the inorganic raw plate is not particularly limited, and as described above, it can be one or more. It can be determined as appropriate according to the material and properties of the inorganic raw plate. Generally, it is preferable to arrange two or more, more specifically several, parallel to the inorganic raw plate where cracks (2) are likely to occur. This is because the crack (2) becomes easier to diffuse.
[0012]
The shape of the groove (5) can be V-shaped in section, U-shaped in section, etc., and is not particularly limited. Position of the groove (5) shall be the 30~50mm inside the edge of the mineral raw plate. Width, and 2~5m m.
[0013]
On the other hand, the depth of the groove (5), shall be the 1% of the inorganic raw plate thickness up to 50%. If the depth of the groove (5) is less than 10% of the thickness of the inorganic raw plate, the crack (2) may not be sufficiently dispersed and may develop into the product part (3). If it exceeds 50%, the groove (5) becomes too deep, and the crack (2) may reach the product part (3) depending on the strength characteristics of the inorganic raw plate.
[0014]
As a method for forming the groove (5), for example, a molding die is brought into contact with the surface or the back surface of the uncured inorganic raw plate before curing or drying, pressure molding, or a router or the like in a state where the curing has started slightly. The cutting of the front surface or the back surface of the inorganic raw plate is exemplified. In the former case, the groove (5) can be formed simultaneously with patterning, and the working efficiency is excellent. Anyway, the formation method of a groove | channel (5) can be suitably selected in consideration of productivity according to the manufacturing method of an inorganic raw plate.
[0015]
In addition, about the inorganic building material which the manufacturing method of the inorganic building material of invention of this application makes object, the kind in particular is not ask | required. What is necessary is just to be formed from the slurry which has a hydraulic material and water as a main component, For example, a fiber reinforced cement board, a gypsum board, an ALC panel etc. are illustrated.
[0016]
【Example】
(Examples 1-3 , Comparative Examples 1-2 )
A fiber reinforced cement board was selected as the inorganic building material, and a fiber reinforced cement raw board having the composition shown in Table 1 was produced by papermaking. The size was 1100 mm in width (product part width 1000 mm), 3100 mm in length (product part length 3000 mm), and 25 mm in thickness. For this fiber reinforced cement base plate, in Tables 1 to 3 and Comparative Example 2 , a V-shaped groove having a cross section of 3 mm in width is shown in Table 2 at a position 50 mm inside from the edge of the fiber reinforced cement base plate. It was provided at the number and depth shown. On the other hand, in Comparative Example 1, no groove was provided.
[0017]
These fiber-reinforced cement blanks were dried at a temperature of 240 ° C. for 25 minutes, and the occurrence of cracks was observed. The results are shown in Table 2.
[0018]
[Table 1]
[0019]
[Table 2]
[0020]
In Examples 1, 2, and 3 , the crack stays at the peripheral portion of the fiber-reinforced cement raw plate and does not progress to the product portion. In contrast, in Comparative Example 1, the crack extends to the product part. It is confirmed that the crack is prevented from progressing to the product part by providing the groove in the peripheral part of the fiber-reinforced cement raw plate.
[0021]
In Comparative Example 2 , the progress of cracks is suppressed as compared with Comparative Example 1, but the crack reaches the product part. This is because the depth of the groove exceeds 50% of the thickness of the fiber-reinforced cement base plate. In the fiber-reinforced cement base plate having the composition shown in Table 1, it is confirmed that the groove depth should not exceed 50% in order to prevent cracks in the product part.
[0022]
Of course, the invention of this application is not limited to the above embodiments and examples. It goes without saying that various modes are possible for details such as the type of inorganic building material, the shape, width, depth, and position of the groove.
[0023]
【The invention's effect】
As described above in detail, according to the invention of this application, cracks that occur in the inorganic original plate during curing or drying can be suppressed without causing waste in the material, and while maintaining good productivity, Progress can be prevented.
[Brief description of the drawings]
FIGS. 1A and 1B are a plan view and an AA cross-sectional view, respectively, showing an outline of a method for producing an inorganic building material according to the invention of this application.
FIG. 2 is a plan view illustrating a state of cracks generated in an inorganic raw plate.
[Explanation of symbols]
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JP36089799A JP4174152B2 (en) | 1999-12-20 | 1999-12-20 | Manufacturing method of inorganic building materials |
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JP36089799A JP4174152B2 (en) | 1999-12-20 | 1999-12-20 | Manufacturing method of inorganic building materials |
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JP4174152B2 true JP4174152B2 (en) | 2008-10-29 |
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