JPH0210119B2 - - Google Patents
Info
- Publication number
- JPH0210119B2 JPH0210119B2 JP3581985A JP3581985A JPH0210119B2 JP H0210119 B2 JPH0210119 B2 JP H0210119B2 JP 3581985 A JP3581985 A JP 3581985A JP 3581985 A JP3581985 A JP 3581985A JP H0210119 B2 JPH0210119 B2 JP H0210119B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- felt
- asbestos
- green sheet
- cement
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 14
- 239000010425 asbestos Substances 0.000 claims description 10
- 229910052895 riebeckite Inorganic materials 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000012615 aggregate Substances 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
〔技術分野〕
本発明は平板屋根材、外壁材などとして用いら
れる石綿セメント板の製造方法に関する。
〔背景技術〕
従来、石綿セメント板の製造方法は石綿、セメ
ント、骨材などを水で混練せしめてスラリー状と
なし、このスラリーをハチエツク式の抄造機にて
グリーンシートを成形しこのグリーンシートをキ
ヤリア板に載置せしめた乾燥状態のフエルト上に
移載せしめて、しかる後、プレス成型機で脱水し
てさらに乾燥させて石綿セメント板を得のが一般
的であつた。しかしながら、四季の変化時に夏場
においてセメントの凝結速度が温度が高くなるた
め速くなり養生中に乾燥気味になりやすいという
傾向があつた。そこで充分な水分を補充されない
まま硬化が促進されるために硬化後のセメント硬
化体の強度が落ちてしまうという欠点があつた。
〔発明の目的〕
本発明は上述した背景技術に鑑みてなされたも
ので、キヤリア板上のフエルトを脱水前に飽水状
態として特に夏場の水分不足による強度劣化を防
止することにある。
〔発明の開示〕
以下、本発明の一実施例に係る図面に基づいて
説明する。
石綿、セメント、骨材等を水で混練せしめてス
ラリー状となし、このスラリーをハチエツク式の
抄造機１にてグリーンシート２を成形しこのグリ
ーンシート２をコンベア上３を走向するキヤリア
板４に載置せしめたフエルト５上に移載せしめ、
しかる後プレス成型機６で脱水しその後養生乾燥
して石綿セメント板７を得るようにしている。こ
のとき、キヤリア板４上のフエルト５には水８を
スプレー等で均一に散布し飽水状態にしている。
したがつて、プレス成型機６でキヤリア板４上
の飽水状態のフエルト５に載置されているグリー
ンシート２が脱水成型される。そのために得られ
たグリーンシート２は高含水率となり夏場におい
ても水分不足とはならないものである。尚、ここ
で、グリーンシート２上からも水分を散布するよ
うにしてフエルト５との二段の水散布方式を採用
しても良い。
〔実施例〕
キヤリア板上のフエルトを飽水状態にしてプレ
ス成型して脱水乾燥して巾300mm、長さ600mm、厚
さ5.5mmの石綿セメント板を得た。このときの強
度指数を夏場と冬場のフエルトに飽水したものと
しないものとを下表に示す。
[Technical Field] The present invention relates to a method for manufacturing asbestos cement boards used as flat roofing materials, exterior wall materials, etc. [Background technology] Conventionally, asbestos-cement boards have been manufactured by mixing asbestos, cement, aggregate, etc. with water to form a slurry, and then forming this slurry into a green sheet using a Hachietsu-type paper machine. It was common practice to obtain an asbestos cement board by transferring the material onto a dry felt placed on a carrier board, then dewatering it with a press molding machine, and drying it further. However, as the seasons change, the setting speed of cement becomes faster in the summer due to the higher temperature, and there is a tendency for the cement to become dry during curing. Therefore, curing is accelerated without sufficient moisture being replenished, resulting in a disadvantage that the strength of the hardened cement product after hardening decreases. [Object of the Invention] The present invention has been made in view of the above-mentioned background art, and an object thereof is to saturate the felt on the carrier board with water before dehydrating it to prevent strength deterioration due to lack of water, especially in summer. [Disclosure of the Invention] An embodiment of the present invention will be described below based on the drawings. Asbestos, cement, aggregate, etc. are kneaded with water to form a slurry, and this slurry is formed into a green sheet 2 using a Hachiek type paper making machine 1, and this green sheet 2 is applied to a carrier plate 4 running on a conveyor 3. Transfer it to the felt 5 that was placed on it,
Thereafter, it is dehydrated using a press molding machine 6, and then cured and dried to obtain an asbestos cement board 7. At this time, water 8 is uniformly sprayed onto the felt 5 on the carrier plate 4 by spraying or the like to saturate it with water. Therefore, the green sheet 2 placed on the saturated felt 5 on the carrier plate 4 is dehydrated and molded by the press molding machine 6. Therefore, the obtained green sheet 2 has a high water content and does not suffer from water shortage even in summer. Incidentally, here, a two-stage water spraying method may be adopted in which water is also sprayed from above the green sheet 2 and the felt 5 is used. [Example] The felt on the carrier board was saturated with water, press-molded, dehydrated and dried to obtain an asbestos cement board with a width of 300 mm, a length of 600 mm, and a thickness of 5.5 mm. The strength index at this time is shown in the table below in summer and winter when the felt is saturated with water and when it is not.
以上のように、本発明はキヤリア板上のフエル
トを飽水状態にして脱水プレス後乾燥硬化させて
いるので夏場でも水分不足となることもないので
強度劣化させることもない。又、夏場、冬場のよ
うに年間を通じて本発明法を用いても強度的には
何ら問題はないものである。又、平板よりも波型
板を成型すると成型時のクラツクも副次的に防止
することができる。
As described above, in the present invention, the felt on the carrier plate is saturated with water and dried and hardened after dehydration pressing, so there is no shortage of water even in summer, and the strength does not deteriorate. Moreover, there is no problem in terms of strength even if the method of the present invention is used throughout the year, such as in summer and winter. Also, by molding a corrugated plate rather than a flat plate, cracks during molding can be prevented as a side effect.
図は本発明の一実施例に係る概略の工程図を示
すものである。
１…抄造機、２…グリーンシート、３…コンベ
ア、４…キヤリア板、５…フエルト、６…プレス
成型機、７…石綿セメント板。
The figure shows a schematic process diagram according to an embodiment of the present invention. 1... Paper making machine, 2... Green sheet, 3... Conveyor, 4... Carrier board, 5... Felt, 6... Press molding machine, 7... Asbestos cement board.
Claims (1)
スラリー状なし、このスラリーを抄造機にてグリ
ーンシートを成形しこのグリーンシートをキヤリ
ア板に載置せしめたフエルト上に移載せしめ、し
かる後脱水プレスし乾燥して石綿セメント板を得
る石綿セメント板の製造法において、脱水プレス
前にフエルトを飽水状態にすることを特徴とする
石綿セメント板の製造方法。1. Knead asbestos, cement, aggregate, etc. with water to form a slurry, form this slurry into a green sheet using a paper machine, transfer this green sheet onto felt placed on a carrier plate, and then A method for producing an asbestos cement board, which is characterized in that the felt is saturated with water before dehydration pressing, in which an asbestos cement board is obtained by dehydration pressing and drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581985A JPS61197481A (en) | 1985-02-25 | 1985-02-25 | Manufacture of asbestos cement board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581985A JPS61197481A (en) | 1985-02-25 | 1985-02-25 | Manufacture of asbestos cement board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61197481A JPS61197481A (en) | 1986-09-01 |
| JPH0210119B2 true JPH0210119B2 (en) | 1990-03-06 |
Family
ID=12452551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3581985A Granted JPS61197481A (en) | 1985-02-25 | 1985-02-25 | Manufacture of asbestos cement board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61197481A (en) |
-
1985
- 1985-02-25 JP JP3581985A patent/JPS61197481A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61197481A (en) | 1986-09-01 |
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