JPH0740013A - Sealing material for nozzle joint part of vessel for molten metal - Google Patents
Sealing material for nozzle joint part of vessel for molten metalInfo
- Publication number
- JPH0740013A JPH0740013A JP5185840A JP18584093A JPH0740013A JP H0740013 A JPH0740013 A JP H0740013A JP 5185840 A JP5185840 A JP 5185840A JP 18584093 A JP18584093 A JP 18584093A JP H0740013 A JPH0740013 A JP H0740013A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- nozzle
- alumina
- molten metal
- seal material
- 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
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、溶湯容器に取付けら
れるノズル接合部のシ−ル材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal material for a nozzle joint portion attached to a molten metal container.
【０００２】[0002]
【従来の技術】従来、溶湯容器の溶湯排出部に取付けら
れるスライドゲ−トにおけるノズル接合部の目地材に
は、モルタルやモルタルにセラミックファイバ−を配合
したものが用いられてきた。しかしながら、これらの目
地材では、その接合部に微細な隙間ができる恐れがあっ
た。そして、一旦目地に隙間ができるとその隙間は最後
まで塞がれることがなかった。また、これら従来の目地
は、ノズルの交換の際に古い目地材をきれいにかき落と
すことが難しく、作業性が悪くその改善が求められてい
た。2. Description of the Related Art Conventionally, mortar or a mixture of mortar and ceramic fiber has been used as a joint material at a nozzle joint portion of a slide gate attached to a molten metal discharge portion of a molten metal container. However, in these joint materials, there is a possibility that a minute gap may be formed in the joint portion. And once a gap was made in the joint, the gap was never closed. Further, in these conventional joints, it is difficult to scrape off the old joint material cleanly at the time of replacing the nozzle, and the workability is poor, and its improvement has been demanded.
【０００３】こうした問題を解決するものとして、アル
ミナ−シリカを主成分とした可塑性板（実公平１−１７
４２１）、耐火材料および耐火繊維に酢酸ビニルを含浸
したシ−ル材本体部と、黒鉛、耐火材料および耐火繊維
からなる黒鉛質部とからなる多層一体構造（特公平１−
２０９４３）の目地が提案されている。As a solution to such a problem, a plastic plate containing alumina-silica as a main component (Jpn.
421), a multi-layered integrated structure comprising a sealant body made of a refractory material and a refractory fiber impregnated with vinyl acetate and a graphite part made of graphite, a refractory material and a refractory fiber (Japanese Patent Publication No.
20943) has been proposed.
【０００４】これらによれば、ノズル交換の際の目地部
の引剥がしはスム−ズに出来て、従来の問題点は解消さ
れたが、しかしこれらの目地材にあっても目地部のシ−
ル特性の点ではなお問題点を残すものであった。According to these, the joint can be peeled off smoothly when the nozzle is replaced, and the conventional problems have been solved. However, even with these joint materials, the seam of the joint is removed.
However, there were still problems in terms of characteristics.
【０００５】即ち、上記の如きシ−ル材では、ノズルの
接合の際に目地部に微小な隙間が存在すると、使用中に
減圧状態となるノズル内部にこの隙間から空気が引き込
まれ、これがノズル内を流れる溶湯と接触して溶湯の酸
化を生じ、溶湯の品質を悪化させるという問題を生じて
いた。したがって、ノズルの接合の際に仮に目地部に微
小な隙間が生じても、使用中にこの隙間が自然と塞がる
ようなシ−ル材の出現が望まれていた。That is, in the seal material as described above, if a minute gap exists in the joint portion when joining the nozzles, air is drawn from the gap into the inside of the nozzle, which is in a depressurized state during use. There has been a problem that the quality of the molten metal deteriorates due to the oxidation of the molten metal caused by contact with the molten metal flowing inside. Therefore, even if a minute gap is created in the joint portion when joining the nozzles, it has been desired to develop a seal material that naturally closes the gap during use.
【０００６】[0006]
【発明が解決しようとする課題】この発明は、ノズルの
接合の際に仮に目地部に微小な隙間が生じても、使用中
にノズルの温度が上昇すると、それにともなってシ−ル
材が軟化しこの隙間を自然と塞ぐようなシ−ル材を得よ
うとするものである。SUMMARY OF THE INVENTION According to the present invention, even if a minute gap is formed in a joint portion at the time of joining nozzles, if the temperature of the nozzle rises during use, the seal material softens accordingly. The purpose is to obtain a seal material that naturally closes the gap.
【０００７】[0007]
【課題を解決するための手段】この発明は、アルミナ粉
末４〜６重量％と、シリカ粉末４３〜６５重量％と、Ｒ
2 Ｏ（ＲはＮａ，Ｋを表す。）７〜１２重量％と、アル
ミナ−シリカ系ファイバ−２４〜３６重量％との混合物
に、有機バインダ−を外割りで１６〜２４重量％加え混
合してなる溶湯容器のノズル接合部のシ−ル材（請求項
１）、アルミナ粉末、シリカ粉末の粒径がいずれも０．
０１〜１mmである請求項１記載の溶湯容器のノズル接合
部のシ−ル材（請求項２）およびアルミナ粉末、シリカ
粉末の平均粒径がいずれも０．１mm以下である請求項１
記載の溶湯容器のノズル接合部のシ−ル材（請求項３）
である。以下に、これらの発明をさらに説明する。According to the present invention, 4 to 6% by weight of alumina powder, 43 to 65% by weight of silica powder, and R
2 O (R represents Na and K.) 7 to 12% by weight and alumina-silica fiber 24 to 36% by weight are mixed with an organic binder in an amount of 16 to 24% by weight. The particle size of the sealing material (claim 1), the alumina powder, and the silica powder at the nozzle joint portion of the molten metal container is 0.
The average particle diameter of the seal material (claim 2), the alumina powder, and the silica powder at the nozzle joint portion of the molten metal container according to claim 1 is 0.1 mm or less.
Seal material for a nozzle joint part of the molten metal container (claim 3)
Is. Hereinafter, these inventions will be further described.
【０００８】この発明のシ−ル材は、アルミナ粉末、シ
リカ粉末、Ｒ2 Ｏ（ＲはＮａ，Ｋを表す。）、アルミナ
−シリカ系ファイバ−、有機バインダ−の混合物からな
るものである。アルミナ粉末の配合比は４〜６重量％で
ある。これが４重量％未満では融点が低下し、目的の温
度（最高１４００℃）において形状が保たれず、またこ
れが６重量％を超えると融点が上昇し、目的の温度（最
低６００℃）において必要な粘性が得られない。The seal material of the present invention comprises a mixture of alumina powder, silica powder, R 2 O (R represents Na and K), alumina-silica fiber and organic binder. The compounding ratio of the alumina powder is 4 to 6% by weight. If it is less than 4% by weight, the melting point will be lowered, and the shape will not be maintained at the target temperature (maximum 1400 ° C). If it exceeds 6% by weight, the melting point will rise and it will be necessary at the target temperature (minimum 600 ° C). Viscosity cannot be obtained.
【０００９】シリカ粉末は４３〜６５重量％である。こ
れが４３重量％未満では目的の温度においてグレ−ズ化
せず、またこれが６５重量％を超えると目的の温度にお
いて形状を保つことができない。The silica powder is 43 to 65% by weight. If it is less than 43% by weight, no glazing occurs at the target temperature, and if it exceeds 65% by weight, the shape cannot be maintained at the target temperature.
【００１０】アルミナ粉末、シリカ粉末は粒径は０．０
１〜１mmの範囲が好ましい。この範囲を外れた微粒であ
ると軟化したとき微細間隙から流れ出てここに大きな間
隙が発生する原因となり、またその上限を超えるとザラ
ザラして密接性が悪化し始め間隙ができる恐れがある。
アルミナ粉末、シリカ粉末の平均粒径は０．１mm以下が
好ましい。The particle size of alumina powder and silica powder is 0.0
A range of 1 to 1 mm is preferred. If the fine particles are out of this range, they tend to flow out from the fine gaps when softened and cause large gaps to be generated there. If the fine grains exceed the upper limit, they may be rough and the adhesion may start to deteriorate to form gaps.
The average particle diameter of the alumina powder and the silica powder is preferably 0.1 mm or less.
【００１１】溶湯付近は１６００〜１４００℃の高温に
なる場合があるが、アルミナ粉末、シリカ粉末を上記の
粒径に制御すれば、シ−ル材は溶湯付近より順にガス化
し、溶融層、半溶融層、未溶融層が順に形成され、シ−
ル性を高めることができる。The temperature in the vicinity of the molten metal may be as high as 1600 to 1400 ° C., but if the alumina powder and the silica powder are controlled to the above particle size, the seal material is gasified in order from the molten metal vicinity, and the molten layer A molten layer and an unmelted layer are formed in that order,
It is possible to improve the property.
【００１２】Ｒ2 Ｏは、例えばＮａ2 ＯやＫ2 Ｏ、また
はこれらの混合物で、配合比は７〜１２重量％とする。
これが７重量％未満では融点が上昇し、目的の温度にお
いて粘性が得らず、また１２重量％を超えると融点が低
下し、目的の温度に達する以前に軟化、流出しシ−ル材
としての役目を果たさなくなって好ましくない。R 2 O is, for example, Na 2 O, K 2 O, or a mixture thereof, and the compounding ratio is 7 to 12% by weight.
If it is less than 7% by weight, the melting point is increased and the viscosity is not obtained at the intended temperature, and if it exceeds 12% by weight, the melting point is lowered, and it is softened and flows out before reaching the intended temperature. It is not preferable because it loses its role.
【００１３】アルミナ−シリカ系フアイバ−は、２４〜
３６重量％とする。これが２４重量％未満ではシ−ト形
状を保つことが難しく、また３６重量％を超えると成形
することが困難となる。アルミナ−シリカ系ファイバ−
は、融点コントロ−ルが行いやすく安価であるためこの
発明に特に適する。アルミナ−シリカの割合は約５５：
４５が最も好ましい。Alumina-silica fibers are 24 to
36% by weight. If it is less than 24% by weight, it will be difficult to maintain the sheet shape, and if it exceeds 36% by weight, molding will be difficult. Alumina-Silica fiber-
Is particularly suitable for the present invention because it is easy to perform melting point control and is inexpensive. Alumina-silica ratio is about 55:
45 is most preferred.
【００１４】有機バインダ−は、前記のアルミナ粉末、
シリカ粉末、Ｒ2 Ｏ、アルミナ−シリカ系ファイバ−の
合量に対し１６〜２４重量％とする。これが１６重量％
未満ではシ−ト状に成形することができず、また２４重
量％を超えると必要とするゴム粘土状の粘性が得られ
ず、高温下ではバインダ−が消化しポ−ラス質となり好
ましくない。The organic binder is the above-mentioned alumina powder,
The amount is 16 to 24% by weight based on the total amount of silica powder, R 2 O and alumina-silica fiber. This is 16% by weight
If it is less than the above range, the sheet cannot be molded into a sheet, and if it exceeds 24% by weight, the required rubber-clay-like viscosity cannot be obtained, and at a high temperature, the binder is digested and becomes porous, which is not preferable.
【００１５】セラミックフアイバ−（アルミナ−シリカ
系ファイバ−）を配合することによってシ−トの保形性
がさらに良好となり、使用するノズルに嵌合できる形に
あらかじめ成形しておくことが容易にできる。By blending the ceramic fiber (alumina-silica fiber), the shape retention of the sheet is further improved, and it can be easily preformed into a shape that can be fitted to the nozzle used. .
【００１６】有機バインダ−は、例えばメチルセルロ−
スを主成分とするセランダ−（ユケン工業（株）商品
名）が好適に用いられる。このシ−ル材は、アルミナ粉
末、シリカ粉末、Ｒ2 Ｏ、アルミナ−シリカ系ファイバ
−の４種類の原料の配合比率によって融点、粘性、グレ
−ズ状態を調整する。The organic binder is, for example, methyl cellulose.
A seranda (trade name of Yuken Kogyo Co., Ltd.) whose main component is S is preferably used. The melting point, viscosity, and glaze state of this seal material are adjusted by the compounding ratio of four kinds of raw materials of alumina powder, silica powder, R 2 O, and alumina-silica fiber.
【００１７】上記の原料混合物は、これをよく混練して
ゴム粘土状の堅さになるように混練してシ−ト状にす
る。このシ−ル材は、常温から８００℃程度の温度では
柔らかく、また内部には微細な気孔を有しているが、１
０００℃程度の高温になるとシ−ル材が流動性を帯びて
きて内部に存在していた気孔も消滅してなくなる。特
に、溶湯容器のノズル内は使用時に負圧となるから、高
温で軟化し流動性を帯びてきたシ−ル材は、ノズルの内
側へ吸引されるようになり、目地として使用されたシ−
ル材に隙間が生じた場合でも、その隙間は使用中に自然
と密閉されることになる。The above raw material mixture is well kneaded to obtain a sheet-like mixture by kneading so as to have a rubber clay-like hardness. This seal material is soft at a temperature from room temperature to about 800 ° C. and has fine pores inside.
At a high temperature of about 000 ° C., the seal material becomes fluid and the pores existing inside disappear. In particular, since the inside of the nozzle of the molten metal container has a negative pressure during use, the seal material that has been softened and fluidized at a high temperature will be sucked into the inside of the nozzle and used as a joint.
Even if a gap occurs in the lumber, the gap will be naturally sealed during use.
【００１８】使用中におけるノズルの昇温は、溶湯温
度、ノズルの材質その他で相違するので、使用温度に見
合った原料配合比が選択されることが好ましい。その一
例を示すと使用温度が１０００℃で、アルミナ粉末４重
量％，シリカ粉末６０重量％，Ｒ2 Ｏ １０重量％，ア
ルミナ−シリカ系ファイバ−２６重量％、１２００℃
で、アルミナ粉末５重量％，シリカ粉末５５％，Ｒ2 Ｏ
１０重量％，アルミナ−シリカ系ファイバ−３０重量
％、１４００℃で、アルミナ粉末６重量％，シリカ粉末
５０％，Ｒ2 Ｏ ８重量％，アルミナ−シリカ系ファイ
バ−３６重量％である。例えばセランダ−をバインダ−
として用いた場合の好ましい添加量は、それぞれの温度
で、１６，２０，２４重量％（外掛け）である。Since the temperature rise of the nozzle during use differs depending on the temperature of the molten metal, the material of the nozzle, and the like, it is preferable to select a raw material mixing ratio suitable for the use temperature. As an example, the operating temperature is 1000 ° C., alumina powder 4% by weight, silica powder 60% by weight, R 2 O 10% by weight, alumina-silica fiber 26% by weight, 1200 ° C.
Then, alumina powder 5% by weight, silica powder 55%, R 2 O
10% by weight, alumina-silica fiber 30% by weight, at 1400 ° C., alumina powder 6% by weight, silica powder 50%, R 2 O 8% by weight, alumina-silica fiber 36% by weight. For example, a seranda to a binder
When it is used as, a preferable addition amount is 16, 20, 24% by weight (external weight) at each temperature.
【００１９】軟化したシ−ル材は、ノズルの内側の方向
に吸引されながらシ−ル材の隙間に入り込むようにして
その気孔を閉塞していくが、過度の流動性を帯びて目地
の外に流れ出すようなことはない。また、このシ−ル材
を冷却するとガラス状になって凝固し、その除去は容易
に出来るようになる。The softened seal material is sucked toward the inside of the nozzle to enter the gap of the seal material to close the pores thereof, but it has excessive fluidity and is outside the joint. There is no such thing as a rush. Further, when this seal material is cooled, it becomes glassy and solidifies, so that it can be easily removed.
【００２０】なお、本発明のシ−トはノズルとの接合面
の離型性をよくするため、シ−トの片面に窒化けい素耐
火物のシ−ト或いは黒鉛質シ−トを積層して成形しても
よい。In the sheet of the present invention, in order to improve the releasability of the joint surface with the nozzle, a sheet of silicon nitride refractory or a graphite sheet is laminated on one side of the sheet. May be molded.
【００２１】[0021]
【作用】この発明は、アルミナ、シリカ、アルカリ、或
いは更にセラミックフアイバ−の所定量に、有機バイン
ダ−を特定した配合比で混合した混合物でノズル接合部
のシ−ル材とし、ノズルの使用時の加熱によってシ−ル
材自体が流動性を帯びるようにしたもので、このシ−ル
材で形成された目地に隙間が生じても使用中に流動化し
たシ−ル材が自然とこの隙間を埋めることになる。その
場合、ノズルは内側が減圧状態となるために、軟化して
流動化したシ−ル材は隙間に吸引された状態となり、シ
−ルは一層確実に行われることになる。According to the present invention, a mixture of alumina, silica, alkali, or a predetermined amount of ceramic fiber and an organic binder in a specified compounding ratio is used as a seal material for a nozzle joint, and the seal material is used when the nozzle is used. The seal material itself is made fluid by the heating of the seal material. Even if a gap is created in the joint formed by this seal material, the seal material fluidized during use will naturally have this gap. Will be filled. In that case, since the inside of the nozzle is in a reduced pressure state, the softened and fluidized sealing material is sucked into the gap, and the sealing is performed more reliably.
【００２２】[0022]
（実施例１）粒度分布が１〜０．０１mmで平均粒径が
０．１mmのＡｌ2 Ｏ3 ５重量％、粒度分布および平均粒
径が同じのＳｉＯ2 ５５重量％、同じ粒度分布および平
均粒径のＮａ2 Ｏ、Ｋ2 Ｏ含有鉱物１０重量％、アルミ
ナ−シリカ系セラミックファイバ−３０重量％を混合し
た。上記の混合原料に対しバインダ−としてセランダ−
（上述の商品名）を外割で２０重量％添加して、これを
混練してシ−ル材とした。このシ−ル材は、ゴム状の硬
さを有するものであったが溶鋼容器の目地に充填するこ
とが出来た。これを１２００℃に加熱したところ著しく
軟化したが、流動化して目地から流れ出ることはなかっ
た。その後、これを常温まで冷却したところガラス化し
てこのシ−ル材は容易に取り除くことが出来た。 （実施例２）粒度分布が０．０１〜１mmで平均粒径が
０．１mmのアルミナ粉末５．５重量％、粒度分布および
平均粒径が同じシリカ粉末５５重量％、同じ粒度分布お
よび平均粒径のＮａ2 Ｏ、Ｋ2 Ｏ含有鉱物１０．５重量
％、アルミナ−シリカ系ファイバ−３０重量％に、バイ
ンダ−として外掛けで２５重量％のセランダ−（上記の
商品名）を添加して混練してシ−ル材とした。このシ−
ル材を下部ノズルとロングノズルの間に用い、１５３０
℃の溶鋼を１チャ−ジした。ノズル孔近傍は完全にガス
化して溶融し、ガスの侵入を防止した。鋼片のＮ2 含有
量を調査したところ、従来のシ−ル材に比べ約１５％減
少した。(Example 1) 5% by weight of Al 2 O 3 having a particle size distribution of 1 to 0.01 mm and an average particle size of 0.1 mm, 55% by weight of SiO 2 having the same particle size distribution and average particle size, the same particle size distribution and average 10% by weight of Na 2 O and K 2 O-containing minerals having particle diameters and 30% by weight of alumina-silica ceramic fiber were mixed. As a binder for the above mixed raw materials
20% by weight of (the above-mentioned trade name) was added and kneaded to obtain a seal material. Although this seal material had a rubber-like hardness, it could be filled into the joints of a molten steel container. When this was heated to 1200 ° C., it was significantly softened, but it fluidized and did not flow out from the joint. Then, when this was cooled to room temperature, it vitrified and the seal material could be easily removed. (Example 2) 5.5% by weight of alumina powder having a particle size distribution of 0.01 to 1 mm and an average particle size of 0.1 mm, 55% by weight of silica powder having the same particle size distribution and average particle size, the same particle size distribution and average particle size Diameter of Na 2 O, K 2 O-containing mineral 10.5% by weight, alumina-silica fiber 30% by weight, and 25% by weight of the outside of the binder (trade name) as a binder The mixture was kneaded into a seal material. This sea
1530 is used between the lower nozzle and the long nozzle.
The molten steel at ℃ was charged for 1 time. The vicinity of the nozzle hole was completely gasified and melted to prevent gas from entering. When the N 2 content of the steel slab was investigated, it was reduced by about 15% as compared with the conventional seal material.
【００２３】[0023]
【効果】以上の本発明のシ−ル材によると、溶鋼容器の
目地部の気密性が一層確実となって接合部からの空気の
侵入がなくなり、溶融金属が酸化されてその品質を低下
させることが防止出来るようになった。[Effect] According to the seal material of the present invention as described above, the airtightness of the joint portion of the molten steel container becomes more reliable, the invasion of air from the joint is eliminated, and the molten metal is oxidized to deteriorate its quality. Can be prevented.
【００２４】また、本発明のシ−ル材を用いると、ノズ
ルの交換を行う場合でも、シ−ル材が冷却後ガラス化し
て容易に剥離できるので、従来のようにこれが頑固に接
着して剥離してこの部分を清掃するのに長時間を要する
ようなことがなくなった。When the seal material of the present invention is used, the seal material vitrifies after cooling and can be easily peeled off even when the nozzle is replaced. It no longer takes a long time to peel off and clean this part.
Claims (3)
末４３〜６５重量％と、Ｒ2 Ｏ（ＲはＮａ，Ｋを表
す。）７〜１２重量％と、アルミナ−シリカ系ファイバ
−２４〜３６重量％との混合物に、有機バインダ−を外
割りで１６〜２４重量％加え混合してなる溶湯容器のノ
ズル接合部のシ−ル材。1. Alumina powder 4 to 6% by weight, silica powder 43 to 65% by weight, R 2 O (R represents Na and K) 7 to 12% by weight, and alumina-silica based fiber-24. A sealing material for a nozzle joint portion of a molten metal container, which is obtained by adding 16 to 24% by weight of an organic binder to a mixture with the mixture of up to 36% by weight.
れも０．０１〜１mmである請求項１記載の溶湯容器のノ
ズル接合部のシ−ル材。2. The seal material for a nozzle joint portion of a molten metal container according to claim 1, wherein the particle diameter of each of the alumina powder and the silica powder is 0.01 to 1 mm.
いずれも０．１mm以下である請求項１記載の溶湯容器の
ノズル接合部のシ−ル材。3. The seal material for a nozzle joint portion of a molten metal container according to claim 1, wherein the alumina powder and the silica powder each have an average particle diameter of 0.1 mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5185840A JP2984521B2 (en) | 1993-07-28 | 1993-07-28 | Seal material for nozzle joint of molten metal container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5185840A JP2984521B2 (en) | 1993-07-28 | 1993-07-28 | Seal material for nozzle joint of molten metal container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0740013A true JPH0740013A (en) | 1995-02-10 |
| JP2984521B2 JP2984521B2 (en) | 1999-11-29 |
Family
ID=16177802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5185840A Expired - Fee Related JP2984521B2 (en) | 1993-07-28 | 1993-07-28 | Seal material for nozzle joint of molten metal container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2984521B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008062288A (en) * | 2006-09-11 | 2008-03-21 | Nippon Steel Corp | Method and structure for sealing nozzle joint part in continuous casting facility for steel |
-
1993
- 1993-07-28 JP JP5185840A patent/JP2984521B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008062288A (en) * | 2006-09-11 | 2008-03-21 | Nippon Steel Corp | Method and structure for sealing nozzle joint part in continuous casting facility for steel |
| JP4719110B2 (en) * | 2006-09-11 | 2011-07-06 | 新日本製鐵株式会社 | Sealing method and sealing structure of nozzle joint in steel continuous casting equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2984521B2 (en) | 1999-11-29 |
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