JP2619316B2 - Metal removal method for metal-coated steel sheet - Google Patents
Metal removal method for metal-coated steel sheetInfo
- Publication number
- JP2619316B2 JP2619316B2 JP33558691A JP33558691A JP2619316B2 JP 2619316 B2 JP2619316 B2 JP 2619316B2 JP 33558691 A JP33558691 A JP 33558691A JP 33558691 A JP33558691 A JP 33558691A JP 2619316 B2 JP2619316 B2 JP 2619316B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- chamber
- processed
- steel sheet
- article
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属付着鋼板から付着
金属を除去する方法に関し、たとえば亜鉛メッキ鋼板か
ら亜鉛を除去する場合に利用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing adhered metal from a metal-attached steel sheet, and is used, for example, when removing zinc from a galvanized steel sheet.
【０００２】[0002]
【従来の技術】自動車用亜鉛メッキ鋼板のスクラップ
材、プレス屑等を製鋼材料として再利用する場合、酸化
亜鉛等が溶解炉寿命を短かくするので、メッキされてい
る亜鉛を鋼から除去しなければならない。金属から亜鉛
を除去する方法として、自動車用鋼板の例ではないが、
特公昭６１−２３８５８号公報には、加熱炉中におい
て、減圧下で、被処理物を加熱し、表面の亜鉛を蒸発さ
せ、蒸発された亜鉛をコレクタに付着させ回収する方法
が開示されている。2. Description of the Related Art When scrap materials and press waste of galvanized steel sheets for automobiles are reused as steelmaking materials, zinc oxide and the like shorten the life of a melting furnace. Must. As a method of removing zinc from metal, it is not an example of automotive steel sheet,
Japanese Patent Publication No. 61-23858 discloses a method of heating an object to be processed under reduced pressure in a heating furnace, evaporating zinc on the surface, and attaching the evaporated zinc to a collector to recover the zinc. .
【０００３】しかし、上記従来方法を自動車用亜鉛メッ
キ鋼板のスクラップ材の亜鉛除去に適用しても高効率の
亜鉛除去は得られない。これは、カーシュレッダからの
スクラップ材には、機械油、プレス油が付着するととも
に、樹脂等の不純物が含まれており、亜鉛回収加熱時に
これら有機材が蒸発して亜鉛と反応し、ＺｎＣｌ2 、Ｚ
ｎＳ、ＺｎＳＯ4 などの難蒸発化合物層を表面に形成
し、これが亜鉛（Ｚｎ）の蒸発を妨げるからであると考
えられる。そこで、有機材付着の有無にかかわらず、金
属付着鋼板から、高効率で付着金属を除去できる方法
が、先に特願平３−１４６６３６号により提案されてい
る。[0003] However, even if the above-mentioned conventional method is applied to zinc removal from scrap materials of galvanized steel sheets for automobiles, highly efficient zinc removal cannot be obtained. This is because the scrap material from the car shredder contains impurities such as resin as well as mechanical oil and press oil, and during the recovery and heating of zinc, these organic materials evaporate and react with zinc to form ZnCl 2. , Z
This is presumably because a hardly vaporizable compound layer such as nS or ZnSO 4 was formed on the surface, which prevented the evaporation of zinc (Zn). Therefore, a method capable of removing the adhered metal from the metal-attached steel sheet with high efficiency regardless of whether or not the organic material is adhered has been previously proposed in Japanese Patent Application No. 3-146636.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、特願平
３−１４６６３６号の付着金属除去方法の場合は、被処
理品を真空中で加熱保持することにより付着金属を蒸発
させるので、気体の対流による加熱が行なわれず、被処
理品の加熱に多くの時間が必要となる。However, in the case of the method for removing adhered metal disclosed in Japanese Patent Application No. 3-146636, the adhered metal is evaporated by heating and holding the object to be processed in a vacuum. No heating is performed, and much time is required for heating the article to be processed.
【０００５】被処理品の加熱時間を短縮するため空気な
どを利用して加熱を行なうと、鋼板に付着している亜鉛
やアルミニウムなどが酸化してしまう。亜鉛やアルミニ
ウムは一度酸化すると、融点や蒸気圧が高くなり、除去
しにくくなる。特公昭５６−１０９７４号公報には、Ｃ
Ｏ2 ／ＣＯモル比＜０．００４の還元性雰囲気で被処理
品を加熱する技術が開示されているが、ＣＯガスは非常
に有害でしかも爆発しやすい危険性があるため、取扱い
が非常に難しく、実施するためには技術的問題が多い。If heating is performed using air or the like in order to shorten the heating time of the article to be processed, zinc, aluminum and the like adhering to the steel sheet are oxidized. Once oxidized, zinc and aluminum increase in melting point and vapor pressure, making it difficult to remove. Japanese Patent Publication No. 56-10974 discloses C
Although a technique of heating the article to be treated in a reducing atmosphere having an O 2 / CO molar ratio <0.004 is disclosed, the handling of CO gas is extremely harmful and there is a risk of explosion. It is difficult and there are many technical problems to implement.
【０００６】本発明は、被処理品の加熱を短時間で行な
うことができ、しかも安全性が高く付着金属を容易に蒸
発させることが可能な付着金属除去方法を提供すること
を目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for removing adhered metal, which can heat an article to be treated in a short time, and is highly safe and can easily evaporate the adhered metal.
【０００７】[0007]
【課題を解決するための手段】この目的を達成するため
の本発明に係る金属付着鋼板の付着金属除去方法は、つ
ぎの通りである。金属付着鋼板からなる被処理品を還元
バーナの直火により加熱し、該加熱された被処理品を減
圧下におくことにより該被処理品に付着している金属を
蒸発させ、その後、前記被処理品を冷却室内で冷却管を
流れるエアにより冷却し、該冷却室を通過した前記エア
を前記還元バーナの燃焼用エアとして用いることを特徴
とする金属付着鋼板の付着金属除去方法。The method for removing the adhered metal from the metal-attached steel sheet according to the present invention to achieve this object is as follows. An article to be treated made of a metal-attached steel sheet is heated by a direct fire of a reduction burner, and the heated article to be treated is placed under reduced pressure to evaporate the metal attached to the article to be treated. A method of removing adhered metal from a metal-attached steel sheet, comprising cooling a treated product by air flowing through a cooling pipe in a cooling chamber, and using the air passing through the cooling chamber as combustion air for the reduction burner.
【０００８】[0008]
【作用】本発明の金属付着鋼板の付着金属除去方法で
は、被処理品が還元バーナの直火により加熱されるの
で、被処理品の加熱が著しく促進される。また、鋼板に
付着した亜鉛等の付着金属は、還元バーナの加熱による
還元作用により酸化されず、減圧下において容易に付着
金属を蒸発させることが可能となる。還元バーナの燃焼
用エアには、冷却室にて被処理品を冷却したエアを用い
るので、燃焼用エアは被処理品との熱交換によって高温
となり、被処理品を加熱する際の熱効率が高められる。In the method for removing adhered metal from a metal-attached steel sheet according to the present invention, the article to be treated is heated by the direct fire of the reducing burner, so that the heating of the article to be treated is significantly promoted. Further, the adhered metal such as zinc adhered to the steel sheet is not oxidized by the reducing action due to the heating of the reducing burner, and the adhered metal can be easily evaporated under reduced pressure. As the combustion air of the reduction burner, the air used to cool the product to be processed in the cooling chamber is used, so the temperature of the combustion air becomes high due to heat exchange with the product to be processed, increasing the thermal efficiency when heating the product Can be
【０００９】[0009]
【実施例】以下に、本発明に係る金属付着鋼板の付着金
属除去方法の望ましい実施例を、図面を参照して説明す
る。図１は、本発明の方法を実施するための装置の一例
を示している。予熱室２１、中間室２２、処理室２３、
冷却室２４が順に配設されている。予熱室２１には、複
数の還元バーナ３１が配置されている。予熱室２１は、
亜鉛メッキ鋼板などの金属付着鋼板からなる被処理品
（図示略）を予め加熱する室である。還元バーナ３１
は、直火により被処理品を加熱するバーナであり、図４
に示す特性を有している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method for removing adhered metal from a metal-attached steel sheet according to the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an apparatus for performing the method of the present invention. A preheating chamber 21, an intermediate chamber 22, a processing chamber 23,
Cooling chambers 24 are arranged in order. A plurality of reduction burners 31 are arranged in the preheating chamber 21. The preheating chamber 21
This is a chamber for preheating a workpiece (not shown) made of a metal-attached steel sheet such as a galvanized steel sheet. Reduction burner 31
Is a burner that heats the article to be processed by an open flame.
Has the characteristics shown in FIG.
【００１０】予熱室２１で加熱された被処理品は中間室
２２に搬送されるようになっている。中間室２２には、
複数の還元バーナ３１が配置されている。中間室２２で
は、予備の減圧が行なわれるようになっている。中間室
２２に搬入された被処理品は、処理室２３に搬送される
ようになっている。The article to be processed heated in the preheating chamber 21 is transported to the intermediate chamber 22. In the intermediate room 22,
A plurality of reduction burners 31 are arranged. In the intermediate chamber 22, preliminary pressure reduction is performed. The article to be processed carried into the intermediate chamber 22 is transported to the processing chamber 23.
【００１１】処理室２３は、被処理品から付着金属を、
たとえば亜鉛メッキ鋼板から成る被処理品から亜鉛を、
蒸発させ回収するための室である。処理室２３には、複
数の直火還元バーナ３１が配置されている。処理室２３
には、室内を減圧するための減圧ポンプ（図示略）が接
続され、その配管途中には蒸発金属を凝縮させて回収す
る回収装置（図示略）が配設されている。[0013] The processing chamber 23 is provided with an attached metal from the article to be processed.
For example, zinc from a workpiece consisting of galvanized steel sheet,
A chamber for evaporating and collecting. In the processing chamber 23, a plurality of direct-fire reduction burners 31 are arranged. Processing room 23
Is connected to a decompression pump (not shown) for reducing the pressure in the room, and a collection device (not shown) for condensing and collecting the evaporated metal is provided in the middle of the piping.
【００１２】処理室２３で付着物としての亜鉛が除去さ
れた被処理品は、冷却室２４に搬送されるようになって
いる。冷却室２４は、処理室２３の減圧状態から大気圧
へ復圧させる室であり、かつ処理室２３で加熱された被
処理品を冷却管を流れるエア（外気）によって冷却する
室である。The workpiece from which zinc as an adhering substance has been removed in the processing chamber 23 is transported to the cooling chamber 24. The cooling chamber 24 is a chamber for returning the pressure of the processing chamber 23 from the reduced pressure state to the atmospheric pressure, and is a chamber for cooling the workpiece heated in the processing chamber 23 by air (outside air) flowing through a cooling pipe.
【００１３】予熱室２１で還元バーナ３１により被処理
品が直火加熱される際に生じる燃焼ガス（ＣＯを１０％
程度含有）は、２次燃焼室２５に導かれている。２次燃
焼室２５では、予熱室２１からの排ガスが図示されない
助燃バーナにより２次燃焼されるようになっている。２
次燃焼室２５で生じた排熱は、冷却室２４の冷却管を介
して熱交換器２６に導かれたエア（外気）と熱交換され
る。熱交換された高温（５００〜８００°Ｃ）のエア
は、処理室２３に設けられたパネルヒータ（図示略）を
介して各室の各還元バーナ３１に供給される。各還元バ
ーナ３１は、熱交換器２６を介して供給された高温のエ
アを燃焼用エアとして利用するようになっている。[0013] Combustion gas (CO is reduced by 10%) generated when the article to be treated is directly heated by the reducing burner 31 in the preheating chamber 21 is heated.
Is contained in the secondary combustion chamber 25. In the secondary combustion chamber 25, the exhaust gas from the preheating chamber 21 is subjected to secondary combustion by an auxiliary burner (not shown). 2
The exhaust heat generated in the next combustion chamber 25 exchanges heat with air (outside air) guided to the heat exchanger 26 via the cooling pipe of the cooling chamber 24. The heat-exchanged high-temperature (500 to 800 ° C.) air is supplied to each reduction burner 31 in each chamber via a panel heater (not shown) provided in the processing chamber 23. Each reduction burner 31 uses high-temperature air supplied through the heat exchanger 26 as combustion air.
【００１４】つぎに、本発明の金属付着鋼板の付着金属
除去方法について説明する。亜鉛メッキ鋼板のプレス屑
をシュレッダーにより破砕処理した被処理品は、図示さ
れないプッシューコンベア等により、予熱室２１に搬入
される。Next, a method for removing adhered metal from a metal-attached steel sheet according to the present invention will be described. An object to be processed, which is obtained by crushing press waste of a galvanized steel sheet by a shredder, is carried into the preheating chamber 21 by a not-shown push-on conveyor or the like.
【００１５】予熱室２１は、図２および図３に示すよう
に、鉄に対しては還元雰囲気であり、亜鉛に対しては酸
化性雰囲気となる。亜鉛は、室内の温度だけでは一部が
酸化することになるが、被処理品が還元バーナ３１に直
火により９００°Ｃ近くまで加熱されると、再度還元さ
れ、元の亜鉛の状態にもどる。還元バーナ３１は、低空
気比での燃焼を行なうことにより、図４に示すようにＣ
Ｏ／ＣＯ2 比を２〜３程度にすることができる。As shown in FIGS. 2 and 3, the preheating chamber 21 has a reducing atmosphere for iron and an oxidizing atmosphere for zinc. Zinc is partially oxidized only at the indoor temperature. However, when the object to be treated is heated to about 900 ° C. by the direct fire in the reduction burner 31, it is reduced again and returns to the original zinc state. . The reduction burner 31 performs combustion at a low air ratio to thereby reduce C as shown in FIG.
The O / CO 2 ratio can be about 2-3.
【００１６】予熱室２１によって予熱された被処理品
は、中間室２２に搬送される。中間室２２では、室内の
予備減圧が行なわれるとともに、還元バーナ３１による
被処理品の直火による加熱が行なわれる。中間室２２で
の被処理品の加熱が終了すると、被処理品は処理室２３
に搬送される。The workpiece preheated by the preheating chamber 21 is transferred to the intermediate chamber 22. In the intermediate chamber 22, preliminary depressurization of the room is performed, and the object to be processed is heated by the reducing burner 31 by direct fire. When the heating of the article in the intermediate chamber 22 is completed, the article to be treated is
Transported to
【００１７】処理室２３では、還元バーナ３１による被
処理品の直火による加熱が行なわれる。還元バーナ３１
による加熱が終了すると、処理室２３内が減圧ポンプに
よって減圧され、被処理品としての亜鉛メッキ鋼板から
亜鉛を蒸発させる。真空脱Ｚｎは、１０-4ないし１０-1
ｍｍＨｇの真空中で行なわれる。このように、被処理品
の加熱は還元バーナ３１による直火で行なわれるので、
放射や気体による伝熱に比べ被処理品の加熱時間が早く
なり、かつ還元バーナ３１による還元作用によって亜鉛
が酸化するのが防止される。In the processing chamber 23, the object to be processed is heated by the direct burn by the reduction burner 31. Reduction burner 31
Is completed, the pressure in the processing chamber 23 is reduced by the vacuum pump, and zinc is evaporated from the galvanized steel sheet as the article to be processed. The vacuum removal Zn is 10 −4 to 10 −1
It is performed in a vacuum of mmHg. As described above, since the heating of the article to be processed is performed by the direct fire by the reducing burner 31,
The heating time of the article to be processed is shorter than the heat transfer by radiation or gas, and the oxidation of zinc by the reduction action of the reduction burner 31 is prevented.
【００１８】処理室２３での亜鉛の除去が終了すると、
被処理品は、冷却室２４に搬送されて冷却される。その
後、被処理品は、冷却室２４から搬出され、鋳造原料と
して再利用される。また、処理室で蒸発した亜鉛は、減
圧ポンプに吸引される手前で回収される。この回収され
た金属は、極めて高純度であり、再利用される。When the zinc removal in the processing chamber 23 is completed,
The article to be processed is transferred to the cooling chamber 24 and cooled. Thereafter, the article to be processed is carried out of the cooling chamber 24 and reused as a casting raw material. Further, the zinc evaporated in the processing chamber is collected just before being sucked by the vacuum pump. This recovered metal is of extremely high purity and is reused.
【００１９】本実施例では、還元バーナの排ガスを２次
燃焼させ、その２次燃焼による熱をエア（外気）と熱交
換し、この高温のエアを被処理品の加熱に利用するとと
もに、還元バーナ３１の燃焼エアとして利用しているの
で、熱効率を大幅に高めることが可能となる。In the present embodiment, the exhaust gas of the reduction burner is subjected to secondary combustion, the heat of the secondary combustion is exchanged with air (outside air), and this high-temperature air is used for heating the article to be treated and reduced. Since it is used as combustion air for the burner 31, the thermal efficiency can be greatly increased.
【００２０】[0020]
【発明の効果】本発明によれば、つぎの効果が得られ
る。 （１）金属付着鋼板からなる被処理品を還元バーナの直
火により加熱し、その後、加熱された被処理品を減圧下
におくことにより被処理品に付着している金属を蒸発さ
せるようにしたので、放射、気体を介しての伝導による
加熱よりも被処理品の加熱を促進させることができる。 （２）還元バーナによる加熱によって還元性雰囲気を生
じさせているので、純度の高いＣＯを用いる処理に比べ
て安全であり、しかも付着金属の酸化も防止することが
できる。 （３）還元バーナの燃焼用エアは、冷却室内で被処理品
を冷却するエアを用いているので、還元バーナには高温
の燃焼用エアを供給することができ、被処理品を加熱す
る際の熱効率を高めることができる。According to the present invention, the following effects can be obtained. (1) An object to be treated consisting of a metal-attached steel plate is heated by a direct fire of a reducing burner, and then the heated object to be treated is placed under reduced pressure so that the metal adhering to the object to be treated is evaporated. Therefore, heating of the article to be processed can be promoted more than heating by radiation or conduction through gas. (2) Since the reducing atmosphere is generated by heating with the reducing burner, it is safer than the treatment using high-purity CO, and the oxidation of the deposited metal can be prevented. (3) Since the combustion air of the reduction burner uses air for cooling the article to be treated in the cooling chamber, high-temperature combustion air can be supplied to the reduction burner, so that the heating of the article to be treated can be performed. Can increase the thermal efficiency.
【図１】本発明の一実施例に係る付着金属除去方法を実
施するための装置の概略構成図である。FIG. 1 is a schematic configuration diagram of an apparatus for performing an attached metal removing method according to an embodiment of the present invention.
【図２】鉄における酸化、還元の変化を示す特性図であ
る。FIG. 2 is a characteristic diagram showing changes in oxidation and reduction of iron.
【図３】亜鉛における酸化、還元の変化を示す特性図で
ある。FIG. 3 is a characteristic diagram showing changes in oxidation and reduction of zinc.
【図４】図１の装置における還元バーナのＣＯ／ＣＯ2
比を示す特性図である。FIG. 4 shows CO / CO 2 of the reduction burner in the apparatus of FIG.
It is a characteristic view showing a ratio.
２１ 予熱室 ２２ 中間室 ２３ 処理室 ２４ 冷却室 ２５ ２次燃焼室 ２６ 熱交換器 ３１ 還元バーナ 21 Preheating Room 22 Intermediate Room 23 Processing Room 24 Cooling Room 25 Secondary Combustion Room 26 Heat Exchanger 31 Reduction Burner
───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹内 康夫 愛知県豊田市トヨタ町１番地 トヨタ自 動車株式会社内 (72)発明者 鈴木 和弘 愛知県豊田市鴻ノ巣町３丁目33番地 ト ヨキン株式会社内 (72)発明者 篠山 輝治 愛知県豊田市鴻ノ巣町３丁目33番地 ト ヨキン株式会社内 (56)参考文献 特開 昭60−33188（ＪＰ，Ａ) 特開 昭57−85916（ＪＰ，Ａ) 特開 平４−225876（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Takeuchi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (72) Inventor Kazuhiro Suzuki 3-33 Konosu-cho, Toyota City, Aichi Prefecture Toyokin Corporation (72) Inventor Teruji Shinoyama 3-33 Konosu-cho, Toyota City, Aichi Prefecture Toyokin Co., Ltd. (56) References JP-A-60-33188 (JP, A) JP-A-57-85916 (JP, A) Kaihei 4-225876 (JP, A)
Claims (1)
ーナの直火により加熱し、該加熱された被処理品を減圧
下におくことにより該被処理品に付着している金属を蒸
発させ、その後、前記被処理品を冷却室内で冷却管を流
れるエアにより冷却し、該冷却室を通過した前記エアを
前記還元バーナの燃焼用エアとして用いることを特徴と
する金属付着鋼板の付着金属除去方法。An object to be processed comprising a metal-attached steel plate is heated by a direct burn of a reducing burner, and the heated object to be processed is placed under reduced pressure to evaporate the metal adhering to the object to be processed. Removing the adhered metal from the metal-attached steel plate, wherein the workpiece is cooled by air flowing through a cooling pipe in the cooling chamber, and the air passing through the cooling chamber is used as combustion air for the reduction burner. Method.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33558691A JP2619316B2 (en) | 1991-11-26 | 1991-11-26 | Metal removal method for metal-coated steel sheet |
| DE19924217081 DE4217081C2 (en) | 1991-05-23 | 1992-05-22 | Device for removing plated metal from scrap steel |
| US08/155,810 US5350438A (en) | 1991-05-23 | 1993-11-23 | Method and apparatus for removing plated metal from steel sheet scraps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33558691A JP2619316B2 (en) | 1991-11-26 | 1991-11-26 | Metal removal method for metal-coated steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05148554A JPH05148554A (en) | 1993-06-15 |
| JP2619316B2 true JP2619316B2 (en) | 1997-06-11 |
Family
ID=18290245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33558691A Expired - Lifetime JP2619316B2 (en) | 1991-05-23 | 1991-11-26 | Metal removal method for metal-coated steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2619316B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5785916A (en) * | 1980-11-17 | 1982-05-28 | Takaoka Kogyo Kk | Pretreatment method as raw material for cast iron of zinc plated steel plate scrap |
| JPS6033188A (en) * | 1983-08-01 | 1985-02-20 | Ishikawajima Harima Heavy Ind Co Ltd | Method of modifying hull bottom |
| JPH0747152B2 (en) * | 1990-12-27 | 1995-05-24 | 芳昭 横山 | Method and device for cleaning solid surface |
-
1991
- 1991-11-26 JP JP33558691A patent/JP2619316B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05148554A (en) | 1993-06-15 |
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