JP3201718B2 - Manufacturing method of inorganic plate - Google Patents
Manufacturing method of inorganic plateInfo
- Publication number
- JP3201718B2 JP3201718B2 JP9281596A JP9281596A JP3201718B2 JP 3201718 B2 JP3201718 B2 JP 3201718B2 JP 9281596 A JP9281596 A JP 9281596A JP 9281596 A JP9281596 A JP 9281596A JP 3201718 B2 JP3201718 B2 JP 3201718B2
- Authority
- JP
- Japan
- Prior art keywords
- green sheet
- suction
- dehydration
- dehydrated
- inorganic plate
- 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
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、無機質板の製造方
法に関し、詳しくは抄造されたグリーンシートを連続的
に搬送しながら脱水する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 plate, and more particularly, to a method for dewatering a green sheet that has been formed while continuously conveying the green sheet.
【０００２】[0002]
【従来の技術】従来のこの種の無機質板の製造方法とし
ては、特開昭６１−２９５００９号公報等に開示される
ものがある。これは、スラリーを抄造して形成されたグ
リーンシートの上に上面被覆フィルムを被覆し、グリー
ンシートを搬送しながらグリーンシートの下面側から吸
引脱水し、しかる後養生硬化させるというものであっ
た。2. Description of the Related Art As a conventional method for producing such an inorganic plate, there is a method disclosed in Japanese Patent Application Laid-Open No. Sho 61-29509. In this method, an upper surface covering film is coated on a green sheet formed by forming a slurry, and the green sheet is conveyed, suction-dehydrated from the lower surface side of the green sheet, and then cured and cured.
【０００３】[0003]
【発明が解決しようとする課題】上記従来例の製造方法
では、グリーンシートの上面を上面被覆フィルムで被覆
した状態で下面側から吸引脱水するためにグリーンシー
トの内部の含水率がほぼ均一な状態になるように脱水さ
れるものの、上面被覆フィルムによる抵抗が大きく含水
率を十分に下げることが困難であり、脱水後のプレス成
形時、模様付けと同時に大量の余剰水が流れ出すため、
シャープな模様付けが困難である。しかも、無機質板に
微細な細孔が多く存在することになり、吸水率が高くな
って寸法安定性が悪かったり、耐凍害性が悪かったりす
るという問題がある。In the above-mentioned conventional manufacturing method, the upper surface of the green sheet is covered with the upper surface coating film and the lower surface side is used for suction dehydration, so that the water content inside the green sheet is substantially uniform. Although it is dehydrated so as to become, it is difficult to sufficiently reduce the water content due to the large resistance of the top coating film, and during press molding after dehydration, a large amount of excess water flows out at the same time as patterning,
Sharp patterning is difficult. In addition, there are many fine pores in the inorganic plate, and there is a problem that the water absorption rate is increased and the dimensional stability is deteriorated, and the frost damage resistance is deteriorated.
【０００４】本発明は叙述の点に鑑みてなされたもので
あって、グリーンシートの内部の含水率がほぼ均一にな
るように脱水すると共に含水率がより低くなるように脱
水することを課題とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above description, and has as its object to dehydrate a green sheet so that the water content inside the green sheet is substantially uniform and to dehydrate the water content so as to be lower. I do.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に本発明の無機質板の製造方法は、抄造されたグリーン
シート１を連続的に搬送しながらグリーンシート１の下
面側から吸引脱水するものにおいて、先ず第１の上面被
覆フィルム２でグリーンシート１の上面を被覆して搬送
しながら下面側から吸引脱水し、次いで上面を開放した
状態でグリーンシート１を搬送しながら下面側から吸引
脱水し、次いで第２の上面被覆フィルム３でグリーンシ
ート１の上面を被覆して搬送しながら下面側から吸引脱
水することを特徴とする。先ず第１の上面被覆フィルム
２でグリーンシート１の上面を被覆した状態で下面側か
ら吸引脱水することより、グリーンシート１を全体から
均一に脱水し、次いでグリーンシート１の上面側を開放
した状態で下面側から吸引脱水することで、グリーンシ
ート１に吸引にて水路となる貫通孔４が明き、次いで第
２の上面被覆フィルム３でグリーンシート１の上面を被
覆した状態で下面側から吸引脱水することにより、グリ
ーンシート１全体から均一に脱水すると共に先に形成さ
れた水路となる貫通孔４を介して効果的に吸引脱水する
ことができる。これによりグリーンシート１の内部の含
水率をほぼ均一な状態にすると共に含水率をより低くで
き、プレス成形時にシャープな模様付けができる。また
従来のように製造された無機質板のように多数の微細な
細孔ができることを少なくでき、吸水率が低くなって、
寸法安定性がよくなり、また耐凍害性のよい無機質板を
得ることができる。Means for Solving the Problems In order to solve the above-mentioned problems, a method of manufacturing an inorganic plate according to the present invention comprises suctioning and dewatering the green sheet 1 from the lower surface side while continuously transporting the formed green sheet 1. First, the upper surface of the green sheet 1 is coated with the first upper surface coating film 2 and is suction-dehydrated from the lower surface while being conveyed. Then, the green sheet 1 is suction-dehydrated from the lower surface while being conveyed with the upper surface open. Then, the upper surface of the green sheet 1 is covered with the second upper surface covering film 3, and the green sheet 1 is suction-dehydrated from the lower surface while being conveyed. First, the green sheet 1 is uniformly dehydrated from the entire surface by suction dehydration from the lower surface while the upper surface of the green sheet 1 is covered with the first upper surface coating film 2, and then the upper surface of the green sheet 1 is opened. By performing suction and dehydration from the lower surface side, through holes 4 serving as water passages are formed in the green sheet 1 by suction, and then suction is performed from the lower surface side with the upper surface of the green sheet 1 covered with the second upper surface coating film 3 By performing the dehydration, the entire green sheet 1 can be uniformly dehydrated, and can be effectively suction-dehydrated through the through-hole 4 which is the previously formed water channel. As a result, the water content inside the green sheet 1 can be made substantially uniform and the water content can be further reduced, so that a sharp pattern can be formed during press molding. In addition, it is possible to reduce the number of fine pores as in the case of an inorganic plate manufactured as in the past, and the water absorption is reduced,
An inorganic plate having improved dimensional stability and good frost damage resistance can be obtained.
【０００６】[0006]
【発明の実施の形態】図１は本発明の無機質板の製造方
法に用いる装置の一例を示す。５はスラリーが抄造され
る抄造槽であり、セメント、高炉水砕スラグ、フライア
ッシュ、ケイ石、石膏、パルプ、ガラス繊維等を水に混
合分散して調整されたセメントスラリーを装填してあ
る。６はスラリーを抄造すると共に抄造したグリーンシ
ート１を搬送するフェルトであり、所定の速度でグリー
ンシート１を搬送するように駆動されるようになってい
る。８は吸引脱水するサクションボックスであり、フェ
ルト６の下面側に配置してある。２は第１の上面被覆フ
ィルムであり、無端帯状にして前後のローラ７間に懸架
してある。３は第２の上面被覆フィルムであり、無端帯
状にして前後のローラ７間に懸架してある。第１の上面
被覆フィルム２と第２の上面被覆フィルム３との間には
上面開放部９を設けてある。上記第１の上面被覆フィル
ム２及び第２の上面被覆フィルム３は不通気性フィルム
であり、無機質板のグリーンシート１の表面によく密着
するように１０μｍ〜０．５ｍｍ程度の厚みのものが好
ましく、ポリエチレン、ポリプロピレン、テフロン、ポ
リエステル等の離型性のよいフィルムを使用することが
できる。FIG. 1 shows an example of an apparatus used in the method for producing an inorganic plate of the present invention. Reference numeral 5 denotes a papermaking tank in which the slurry is formed, and is loaded with a cement slurry prepared by mixing and dispersing cement, granulated blast furnace slag, fly ash, silica stone, gypsum, pulp, glass fiber and the like in water. Reference numeral 6 denotes a felt that forms the slurry and conveys the green sheet 1 that has been formed, and is driven to convey the green sheet 1 at a predetermined speed. Reference numeral 8 denotes a suction box for suction dehydration, which is arranged on the lower surface side of the felt 6. Reference numeral 2 denotes a first top cover film which is suspended between the front and rear rollers 7 in an endless belt shape. Reference numeral 3 denotes a second top cover film which is suspended between the front and rear rollers 7 in an endless belt shape. An upper surface opening 9 is provided between the first upper film 2 and the second upper film 3. The first top cover film 2 and the second top cover film 3 are air-impermeable films, and preferably have a thickness of about 10 μm to 0.5 mm so as to be in close contact with the surface of the inorganic sheet green sheet 1. A film having good releasability, such as polyethylene, polypropylene, Teflon, and polyester, can be used.
【０００７】しかして、抄造槽５でセメントスラリーが
連続的に抄造されてグリーンシート１がフェルト６の上
に形成され、グリーンシート１がフェルト６で送られて
グリーンシート１が下面側から吸引脱水される。グリー
ンシート１を下面側から吸引脱水するとき、先ず第１の
上面被覆フィルム２でグリーンシート１の上面を被覆し
た状態でグリーンシート１を搬送しながら下面側から吸
引脱水され、次にグリーンシート１の上面を上面開放部
９で開放した状態でグリーンシート１を搬送しながら下
面側から吸引脱水され、次に第２の上面被覆フィルム３
でグリーンシート１の上面を被覆した状態でグリーンシ
ート１を搬送しながら吸引脱水される。グリーンシート
１の上面を第１の上面被覆フィルム２で被覆した状態で
グリーンシート１の下面側から吸引脱水するときは図２
（ａ）のような状態で行われ、グリーンシート１の全面
から均一に吸引脱水される。グリーンシート１の上面を
上面開放部９で開放した状態でグリーンシート１の下面
側から吸引脱水するときは吸引の力で図２（ｂ）に示す
ように上下に貫通して水路となる複数の貫通孔４が明
く。この貫通孔４はグリーンシート１の材料の疎の部分
に明く。グリーンシート１の上面を第２の上面被覆フィ
ルム３で被覆した状態でグリーンシート１の下面側から
吸引脱水するときは図２（ｃ）の状態で行われ、グリー
ンシート１の全面から均一に吸引脱水されると共に貫通
孔４を水路としてグリーンシート１の水分がより脱水さ
れる。Thus, the cement slurry is continuously formed in the papermaking tank 5 to form the green sheet 1 on the felt 6, and the green sheet 1 is fed by the felt 6 and the green sheet 1 is suction-dewatered from the lower side. Is done. When the green sheet 1 is suction-dehydrated from the lower surface side, the green sheet 1 is first suction-dehydrated from the lower surface while the green sheet 1 is conveyed in a state where the upper surface of the green sheet 1 is covered with the first upper surface coating film 2. The green sheet 1 is suctioned and dewatered from the lower surface side while the green sheet 1 is being conveyed in a state where the upper surface of the green film 1 is opened by the upper surface opening portion 9.
The green sheet 1 is sucked and dehydrated while being conveyed while covering the upper surface of the green sheet 1. FIG. 2 shows a state in which the upper surface of the green sheet 1 is covered with the first upper surface covering film 2 and suction dehydration is performed from the lower surface side of the green sheet 1.
This is performed in a state as shown in FIG. 3A, and the green sheet 1 is uniformly suction-dehydrated from the entire surface. When suction dehydration is performed from the lower surface side of the green sheet 1 in a state where the upper surface of the green sheet 1 is opened by the upper surface opening portion 9, a plurality of water channels penetrate vertically by suction force as shown in FIG. The through hole 4 is clear. This through hole 4 is evident in a portion where the material of the green sheet 1 is sparse. When suction dehydration is performed from the lower surface side of the green sheet 1 in a state where the upper surface of the green sheet 1 is covered with the second upper surface covering film 3, the suction dehydration is performed in the state of FIG. At the same time, the water in the green sheet 1 is further dehydrated by using the through holes 4 as water channels.
【０００８】次に本発明の製造方法をさらに具体的に述
べる。セメントスラリーとして次に配合のものを用意し
た。 セメントスラリーの配合 セメント ４０ｗｔ％ 骨材 ４０ｗｔ％ ケイ石 １０ｗｔ％ パルプ １０ｗｔ％ 水（スラリー濃度が４〜１０％になるように添加した） このセメントスラリーをフェルト６の上に抄造してグリ
ーンシート１を連続的に形成した。そしてフェルト６の
上のグリーンシート１の上面に第１の上面被覆フィルム
２が３ｍ程度接触するようにグリーンシート１の上面を
第１の上面被覆フィルム２で被覆してグリーンシート１
を搬送しながらサクションボックス８から吸引脱水し
た。次に上面開放部９でグリーンシート１の上面を１〜
２ｍ程度の開放領域で開放した状態でサクションボック
ス８により吸引脱水した。最後にグリーンシート１の上
面に第２の上面被覆フィルム３が３ｍ程度接触するよう
にグリーンシート１の上面を第２の上面被覆フィルム３
で被覆してグリーンシート１を搬送しながらサクション
ボックス８から吸引脱水した。サクションボックス８か
ら吸引は２０±５ｃｍＨｇであった。上記のようにして
脱水した後のグリーンシート１の厚みは１３〜２０ｍｍ
程度であった。また脱水後の脱水率は、従来は８０％程
度であったのが、本発明では７０％に低下した。Next, the production method of the present invention will be described more specifically. Next, a compound was prepared as a cement slurry. Mixing of cement slurry Cement 40 wt% Aggregate 40 wt% Silica 10 wt% Pulp 10 wt% Water (added so that the slurry concentration becomes 4 to 10%) This cement slurry is formed on felt 6 to form green sheet 1. Formed continuously. Then, the upper surface of the green sheet 1 is covered with the first upper surface covering film 2 such that the first upper surface covering film 2 contacts the upper surface of the green sheet 1 on the felt 6 by about 3 m.
Was sucked and dehydrated from the suction box 8 while being transported. Next, the upper surface of the green sheet 1 is
Suction dehydration was performed by the suction box 8 while being opened in an open area of about 2 m. Finally, the upper surface of the green sheet 1 is brought into contact with the second upper surface covering film 3 so that the second upper surface covering film 3 contacts the upper surface of the green sheet 1 by about 3 m.
Then, the green sheet 1 was suctioned and dehydrated from the suction box 8 while being conveyed. The suction from the suction box 8 was 20 ± 5 cmHg. The thickness of the green sheet 1 after dehydration as described above is 13 to 20 mm
It was about. The dehydration rate after dehydration was about 80% in the past, but was reduced to 70% in the present invention.
【０００９】[0009]
【発明の効果】本発明は叙述のように先ず第１の上面被
覆フィルムでグリーンシートの上面を被覆して搬送しな
がら下面側から吸引脱水することにより、グリーンシー
トを全体から均一に脱水し、次いで上面を開放した状態
でグリーンシートを搬送しながら下面側から吸引脱水す
ることにより、グリーンシートに吸引にて水路となる貫
通孔が明き、次いで第２の上面被覆フィルムでグリーン
シートの上面を被覆して搬送しながら下面側から吸引脱
水することにより、グリーンシート全体から均一に脱水
すると共に先に形成された水路となる貫通孔を介して効
果的に吸引脱水することができるものであって、グリー
ンシートの内部の含水率をほぼ均一な状態にすると共に
含水率をより低くでき、プレス成形時にシャープな模様
付けができるものであり、また従来のように製造された
無機質板に多数の微細な細孔ができることを少なくで
き、吸水率が低くなって、寸法安定性がよくなり、また
耐凍害性のよい無機質板を得ることができるものであ
る。According to the present invention, as described above, first, the upper surface of the green sheet is coated with the first upper surface coating film, and the green sheet is uniformly dehydrated from the entire surface by suction and dehydration from the lower surface while being conveyed. Next, by carrying out suction dehydration from the lower surface side while transporting the green sheet with the upper surface opened, a through hole serving as a water channel is formed by suction in the green sheet, and then the upper surface of the green sheet is covered with the second upper surface covering film. By sucking and dewatering from the lower surface side while coating and transporting, it is possible to uniformly dewater the entire green sheet and effectively suction and dewater through the through-hole formed as a water channel formed earlier. , Which can make the water content inside the green sheet almost uniform and lower the water content, and can give a sharp pattern during press molding In addition, it is possible to reduce the number of fine pores formed in the inorganic plate manufactured conventionally, reduce the water absorption, improve the dimensional stability, and obtain an inorganic plate having good frost damage resistance. Can be done.
【図１】本発明の実施の形態の一例の製造方法を説明す
る装置の断面図である。FIG. 1 is a cross-sectional view of an apparatus for explaining a manufacturing method according to an example of an embodiment of the present invention.
【図２】（ａ）（ｂ）（ｃ）は同上の脱水の工程を説明
する断面図である。FIGS. 2 (a), 2 (b) and 2 (c) are cross-sectional views illustrating a dehydration step of the above.
１ グリーンシート ２ 第１の上面被覆フィルム ３ 第２の上面被覆フィルム DESCRIPTION OF SYMBOLS 1 Green sheet 2 1st upper surface coating film 3 2nd upper surface coating film
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平９−141626（ＪＰ，Ａ) 特開 平９−169016（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B28B 1/00 - 1/54 B28B 11/00 - 19/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-141626 (JP, A) JP-A-9-169016 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B28B 1/00-1/54 B28B 11/00-19/00
Claims (1)
送しながらグリーンシートの下面側から吸引脱水する無
機質板の製造方法において、先ず第１の上面被覆フィル
ムでグリーンシートの上面を被覆して搬送しながら下面
側から吸引脱水し、次いで上面を開放した状態でグリー
ンシートを搬送しながら下面側から吸引脱水し、次いで
第２の上面被覆フィルムでグリーンシートの上面を被覆
して搬送しながら下面側から吸引脱水することを特徴と
する無機質板の製造方法。In a method of manufacturing an inorganic plate, wherein a green sheet thus formed is suctioned and dewatered from a lower surface side of the green sheet while being continuously transported, an upper surface of the green sheet is first covered with a first upper surface coating film and transported. While the green sheet is conveyed while the upper surface is open, the suction and dehydration is performed from the lower surface side, and then the upper surface of the green sheet is covered with the second upper surface coating film and the lower surface is conveyed. A method for producing an inorganic plate, comprising dehydrating by suction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9281596A JP3201718B2 (en) | 1996-04-15 | 1996-04-15 | Manufacturing method of inorganic plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9281596A JP3201718B2 (en) | 1996-04-15 | 1996-04-15 | Manufacturing method of inorganic plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09277229A JPH09277229A (en) | 1997-10-28 |
| JP3201718B2 true JP3201718B2 (en) | 2001-08-27 |
Family
ID=14064925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9281596A Expired - Lifetime JP3201718B2 (en) | 1996-04-15 | 1996-04-15 | Manufacturing method of inorganic plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3201718B2 (en) |
-
1996
- 1996-04-15 JP JP9281596A patent/JP3201718B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09277229A (en) | 1997-10-28 |
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