JPH03215338A - Drying of bottomed thick ceramic material - Google Patents
Drying of bottomed thick ceramic materialInfo
- Publication number
- JPH03215338A JPH03215338A JP686990A JP686990A JPH03215338A JP H03215338 A JPH03215338 A JP H03215338A JP 686990 A JP686990 A JP 686990A JP 686990 A JP686990 A JP 686990A JP H03215338 A JPH03215338 A JP H03215338A
- Authority
- JP
- Japan
- Prior art keywords
- drying
- ceramic material
- bottomed
- thick ceramic
- infrared heater
- 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.)
- Granted
Links
- 238000001035 drying Methods 0.000 title claims abstract description 43
- 229910010293 ceramic material Inorganic materials 0.000 title abstract 8
- 239000000919 ceramic Substances 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 7
- 230000007547 defect Effects 0.000 abstract description 2
- 239000003822 epoxy resin Substances 0.000 abstract description 2
- 229920000647 polyepoxide Polymers 0.000 abstract description 2
- 241000276425 Xiphophorus maculatus Species 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- 239000002023 wood Substances 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Insulating Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は例えば底付き碍管の底部等となる有底肉厚陶磁
器素体の乾燥方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for drying a thick-walled ceramic body with a bottom, such as the bottom of a ceramic tube with a bottom.
（従来の技術）
従来、例えば大型の底付き碍管等の製造工程においては
、肉厚が４０〜７０■、直径が１５０〜６５０ ｍｍ、
高さが３００〜５００ ｍ程度の有底肉厚陶磁器素体を
乾燥させる必要がある。(Prior art) Conventionally, for example, in the manufacturing process of large-sized bottomed insulators, etc., the wall thickness is 40 to 70 mm, the diameter is 150 to 650 mm,
It is necessary to dry a thick-bottomed ceramic body with a height of about 300 to 500 m.
このため従来は陶磁器素体を熱風乾燥機中で乾燥する方
法も行なわれているが、前記のような肉厚のものあるい
は肉厚差の大きい陶磁器素体は均一乾燥が極めて困難で
クラックの発生率が高く、乾燥歩留りが低い欠点があっ
た。また大物の陶磁器素体の乾燥方法として一般的に広
く知られている通電乾燥手段を用いて、第２図に示され
るように、有底肉厚陶磁器素体（１）の底面に通電乾燥
用の円形の電極（２）を張り付けるとともに、有底肉厚
陶磁器素体（１）の上部外周にも環状の電極（３）を張
り付けて両電極間に通電し、ジュール熱による通電乾燥
を行うことも実施されていた。しかしこのような通電乾
燥方法は直接通電を行うために電極（２）、（３）の放
電によるコロナの発生があり、有底肉厚陶磁器素体（１
）の表面に斑点を生じ易い問題があった。またこの方法
は乾燥の進行にともなって有底肉厚陶磁器素体（１）の
固有抵抗値が変化するために電流値の設定が困難なうえ
、底部のコーナ一部（４）に電流が流れにくいためにこ
の部分の乾燥が遅れ、乾燥のバラッキによる収縮差によ
ってコーナ一部（４）にクランクが入り易いという問題
もあった。For this reason, conventional methods have been used to dry ceramic bodies in a hot air dryer, but ceramic bodies with thick walls or large differences in thickness are extremely difficult to dry uniformly, and cracks may occur. The disadvantages were that the drying yield was high and the drying yield was low. In addition, as shown in Fig. 2, the bottom of the thick-walled ceramic body (1) was heated using an electric current drying method that is widely known as a method for drying large ceramic bodies. At the same time, a circular electrode (2) is attached, and a ring-shaped electrode (3) is also attached to the upper outer periphery of the thick-walled ceramic body (1), and electricity is applied between both electrodes to perform electrical drying using Joule heat. This was also carried out. However, in this energization drying method, corona is generated due to the discharge of the electrodes (2) and (3) due to direct energization, and the thick ceramic body with a bottom (1)
) had the problem of easily causing spots on the surface. In addition, with this method, it is difficult to set the current value because the specific resistance value of the thick-bottomed ceramic body (1) changes as the drying progresses, and the current flows in a part of the bottom corner (4). There was also the problem that the drying of this part was delayed due to the drying process, and that the crank easily entered the corner part (4) due to the difference in shrinkage due to uneven drying.
（発明が解決しようとする課題）
本発明はこのような従来の問題点を解決して、有底肉厚
陶磁器素体をクランクや斑点等の欠陥を生ずることなく
均一に乾燥させることができる有底肉厚陶磁器素体の乾
燥方法を提供するためになされたものである。(Problems to be Solved by the Invention) The present invention solves these conventional problems and provides an advantageous method that can dry a thick-bottomed ceramic body uniformly without producing defects such as cranks or spots. This was developed to provide a method for drying thick-bottomed ceramic bodies.
（課題を解決するための手段）
上記の課題を解決するためになされた本発明は、底部に
桟木を当てて乾燥室内に置かれた有底肉厚陶磁器素体の
開口部を板状の蓋で覆い、この蓋の下面に吊るされた赤
外線ヒータからの輻射熱により有底肉厚陶磁器素体の内
部を乾燥室内の温度以上に保ちつつ乾燥させることを特
徴とするものである。(Means for Solving the Problems) The present invention, which has been made to solve the above problems, covers the opening of a thick-walled ceramic body with a bottom placed in a drying chamber with a crosspiece placed on the bottom using a plate-shaped lid. It is characterized by drying while keeping the inside of the thick-walled ceramic body at a temperature higher than the temperature inside the drying chamber using radiant heat from an infrared heater suspended on the underside of the lid.
（実施例） 以下に本発明を図示の実施例によって詳細に説明する。(Example) The present invention will be explained in detail below with reference to illustrated embodiments.
第１図において、（１）は底部及び側壁の肉厚が４０〜
７０閣、直径が１５０〜６５０ｍ程度の例えば大型底付
碍管等に用いる有底肉厚陶磁器素体であり、その底部の
両側にフエルト（５）付きの桟木（６）、（６）を当て
た状態で乾燥室の内部に置かれている。桟木（６）、（
６）を当てる位置は有底肉厚陶磁器素体（１）の内周面
を下方へ延長した線上に桟木（６）、（６）の中心が位
置するようにしておくことが好ましい。なお乾燥室の内
部は例えば湿度が７０％程度、温度が３５〜４０℃程度
に維持されている。In Figure 1, (1) has a bottom and side wall thickness of 40~
It is a thick-bottomed ceramic body with a diameter of about 150 to 650 m, used for large-bottomed insulator pipes, etc., and the bottom is covered with crosspieces (6) and (6) with felt (5) on both sides. It is placed inside the drying room. Samaki (6), (
6) is preferably applied so that the centers of the crosspieces (6) are located on a line extending downward from the inner circumferential surface of the thick-walled ceramic body (1). Note that the humidity inside the drying chamber is maintained at, for example, about 70% and the temperature at about 35 to 40°C.
このようにして乾燥室の内部に置かれた有底肉厚陶磁器
素体（１）の開口部には、例えば耐水性ベニヤ板等から
なる板状の蓋（７）が載せられる。この蓋（７）はその
中心の円形孔にエポキシ樹脂等からなる小Ｉ！（７ａ）
を備えたものであり、この小Ｉ！（７ａ）を貫通するコ
ード（８）の下端に赤外線ヒータ（９）が吊るされてい
る。この赤外線ヒータ（９）としては、本出願人の出願
に係る実公昭５０−３３０３号公報に示されるような、
ジルコニア、コージエライト、アルミナ等のセラミック
体の内部にニクロム線を埋め込んだ間接加熱型の遠赤外
線ヒーターが特に好ましいなお赤外線ヒータ（９）は、
有底肉厚陶磁器素体（１）の内底面から８０〜１００
ｔｔｍ程度の高さに吊るしておくことが好ましい。A plate-shaped lid (7) made of, for example, water-resistant plywood is placed over the opening of the bottomed thick-walled ceramic body (1) placed inside the drying chamber in this manner. This lid (7) has a small circular hole in the center made of epoxy resin or the like. (7a)
This small I! An infrared heater (9) is suspended from the lower end of a cord (8) passing through (7a). This infrared heater (9) is as shown in Japanese Utility Model Publication No. 50-3303 filed by the present applicant.
The infrared heater (9) is particularly preferably an indirect heating type far-infrared heater in which a nichrome wire is embedded inside a ceramic body such as zirconia, cordierite, or alumina.
80 to 100 from the inner bottom of the bottomed thick ceramic body (1)
It is preferable to hang it at a height of about ttm.
この赤外線ヒータ（９）に変流器等で電流量を制御しつ
つ通電し、蓋（７）により開口部を覆われた有底肉厚陶
磁器素体（１）の内部を赤外線ヒータ（９）からの輻射
熱により乾燥室内の温度よりも高い５０〜８０℃とする
。そしてこの状態で所定時間保ちつつ乾燥室内で乾燥を
進行させる．
この結果、有底肉厚陶磁器素体（１）は内外両面から乾
燥されることとなるが、水分は蓋（７）により密閉され
た有底肉厚陶磁器素体（１）内で拡散しつつ徐々に外表
面に移行し、陶磁器素体（１）の外表面より乾燥室内に
ゆっくりと蒸発し、クランクを生ずることなく均一な乾
燥が行われる．また底部には桟木（６）を当ててあるの
で、底面の乾燥も他の部分と同様に行われる。Electricity is supplied to this infrared heater (9) while controlling the amount of current using a current transformer, etc., and the inside of the bottomed thick ceramic body (1) whose opening is covered with a lid (7) is heated by the infrared heater (9). The temperature is set at 50 to 80°C, which is higher than the temperature inside the drying chamber, due to radiant heat from the drying chamber. Then, drying is allowed to proceed in the drying chamber while maintaining this state for a predetermined period of time. As a result, the thick-walled ceramic body (1) with a bottom is dried from both the inside and outside, but the moisture is diffused inside the thick-bottomed ceramic body (1), which is sealed by the lid (7). It gradually transfers to the outer surface and slowly evaporates from the outer surface of the ceramic body (1) into the drying chamber, resulting in uniform drying without producing cranks. Also, since the bottom is covered with a crosspiece (6), the bottom can be dried in the same way as other parts.
なお、蓋（７）の上面に５０〜８０℃の温度を色の変化
として表示できるサーモラベルａω等を張り付けておけ
ば、内部の温度管理を容易に行なえるとともに、もし赤
外線ヒータ（９）が断線したような場合にはサーモラベ
ルの色変化がないことから温度上昇がないことが直ちに
目視でき、ヒーターの故障発見も容易に行なえる利点を
生ずる．
（発明の効果）
以上に説明したように、本発明の乾燥方法によれば有底
肉厚陶磁器素体を内外両面から均一に乾燥させることが
でき、従来の熱風乾燥のように表面部分の局部的乾燥に
ともなうクラックの発生がなく、さらに陶磁器素体に電
極を張り付けた通電乾燥方法のようなコロナによる斑点
の発生や、通電不良部分の乾燥収縮の不均一によるクラ
ック等が生ずることがない。また本発明の乾燥方法によ
れば、内部の温度を定期的に管理するだけでよく、乾燥
作業が容易となる．
このように本発明は従来は均一な乾燥を行うのに苦労し
ていた有底碍管等の素材となる有底肉厚陶磁器素体の乾
燥方法として実用性に優れた方法であり、産業の発展に
寄与するところは極めて大である。In addition, if you attach a thermo label aω, etc. that can display the temperature of 50 to 80°C as a color change to the top surface of the lid (7), you can easily control the internal temperature, and if the infrared heater (9) In the event of a disconnection, the color of the thermo label does not change, so it is immediately visible that there is no temperature rise, which has the advantage of making it easy to discover heater failures. (Effects of the Invention) As explained above, according to the drying method of the present invention, a thick-walled ceramic body with a bottom can be dried uniformly from both the inner and outer surfaces, and unlike conventional hot air drying, the drying method can There is no cracking due to drying, and there are no spots caused by corona or cracks due to uneven drying shrinkage in areas where electricity is not applied, as is the case with energizing drying methods in which electrodes are attached to ceramic bodies. Further, according to the drying method of the present invention, it is only necessary to periodically control the internal temperature, making the drying work easier. As described above, the present invention is a highly practical method for drying thick ceramic bodies with bottoms, which are used as raw materials for bottomed insulator tubes, etc., for which it has been difficult to dry uniformly in the past. The contribution it makes is extremely large.
第１図は本発明の乾燥方法を説明する端面図、第２図は
従来の乾燥方法を説明する同じく端面図である。
（１）：
有底肉厚陶磁器素体、
（６）：
桟木、
（７）：
蓋、
（９）：赤外線ヒータ。FIG. 1 is an end view illustrating the drying method of the present invention, and FIG. 2 is an end view illustrating the conventional drying method. (1): Thick ceramic body with bottom, (6): Crosspiece, (7): Lid, (9): Infrared heater.
Claims (1)
陶磁器素体（１）の開口部を板状の蓋（７）で覆い、こ
の蓋（７）の下面に吊るされた赤外線ヒータ（９）から
の輻射熱により有底肉厚陶磁器素体（１）の内部を乾燥
室内の温度以上に保ちつつ乾燥させることを特徴とする
有底肉厚陶磁器素体の乾燥方法。The opening of the bottomed thick-walled ceramic body (1) placed in the drying chamber with a crosspiece (6) placed on the bottom is covered with a plate-shaped lid (7), and a plate-like lid (7) is hung on the underside of the lid (7). A method for drying a thick-walled ceramic body with a bottom, characterized in that the inside of the thick-walled ceramic body with a bottom (1) is dried while being kept at a temperature higher than the temperature inside the drying chamber using radiant heat from an infrared heater (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP686990A JPH03215338A (en) | 1990-01-16 | 1990-01-16 | Drying of bottomed thick ceramic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP686990A JPH03215338A (en) | 1990-01-16 | 1990-01-16 | Drying of bottomed thick ceramic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03215338A true JPH03215338A (en) | 1991-09-20 |
| JPH0476946B2 JPH0476946B2 (en) | 1992-12-07 |
Family
ID=11650242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP686990A Granted JPH03215338A (en) | 1990-01-16 | 1990-01-16 | Drying of bottomed thick ceramic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03215338A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0587452A (en) * | 1991-09-25 | 1993-04-06 | Ngk Insulators Ltd | Drying method for thick ceramics |
| JP2013193904A (en) * | 2012-03-19 | 2013-09-30 | Ngk Insulators Ltd | Method of drying porcelain tube |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354695A (en) | 1992-04-08 | 1994-10-11 | Leedy Glenn J | Membrane dielectric isolation IC fabrication |
| US6714625B1 (en) | 1992-04-08 | 2004-03-30 | Elm Technology Corporation | Lithography device for semiconductor circuit pattern generation |
| US6551857B2 (en) | 1997-04-04 | 2003-04-22 | Elm Technology Corporation | Three dimensional structure integrated circuits |
| US5915167A (en) | 1997-04-04 | 1999-06-22 | Elm Technology Corporation | Three dimensional structure memory |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54158414A (en) * | 1978-06-05 | 1979-12-14 | Yuzuru Matsubara | Process for drying pottery and other earthen products |
-
1990
- 1990-01-16 JP JP686990A patent/JPH03215338A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54158414A (en) * | 1978-06-05 | 1979-12-14 | Yuzuru Matsubara | Process for drying pottery and other earthen products |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0587452A (en) * | 1991-09-25 | 1993-04-06 | Ngk Insulators Ltd | Drying method for thick ceramics |
| JP2013193904A (en) * | 2012-03-19 | 2013-09-30 | Ngk Insulators Ltd | Method of drying porcelain tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0476946B2 (en) | 1992-12-07 |
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