JPS6053742B2 - Manufacturing method of single-sided hot-dip galvanized steel sheet - Google Patents
Manufacturing method of single-sided hot-dip galvanized steel sheetInfo
- Publication number
- JPS6053742B2 JPS6053742B2 JP55089570A JP8957080A JPS6053742B2 JP S6053742 B2 JPS6053742 B2 JP S6053742B2 JP 55089570 A JP55089570 A JP 55089570A JP 8957080 A JP8957080 A JP 8957080A JP S6053742 B2 JPS6053742 B2 JP S6053742B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- hot
- galvanized steel
- dip
- sided
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 10
- 239000008397 galvanized steel Substances 0.000 title claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 238000005246 galvanizing Methods 0.000 claims description 16
- 238000007747 plating Methods 0.000 claims description 16
- 239000010960 cold rolled steel Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 238000007796 conventional method Methods 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 239000003112 inhibitor Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000000137 annealing Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0224—Two or more thermal pretreatments
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Coating With Molten Metal (AREA)
Description
【発明の詳細な説明】
この発明は、片面溶融亜鉛めつき鋼板の製造方法に関す
るものであつて、鋼板の一面に水スラリー状の溶融めつ
き阻止剤を塗布して溶融めつきを施し、その後塗膜を剥
離することにより片面亜鉛めつ鋼板を得る方法にかかり
、とくに前記溶融めつき阻止剤に特長をもつて新規な製
造方法についての提案てある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a single-sided hot-dip galvanized steel sheet, in which hot-dip galvanizing is applied by applying a hot-dip galvanizing agent in the form of a water slurry to one side of the steel sheet, and then A method for obtaining a single-sided galvanized steel sheet by peeling off a coating film is proposed, and a novel manufacturing method has been proposed, particularly featuring the above-mentioned hot-dip galvanizing inhibitor.
最近、自動車、家庭電機器用、あるいは建材用などの鋼
板ては、その片面にのみめつきを施して必要な耐食性を
実現し、あわせて溶接性の改善を図り、もつてめつき金
属を有効に利用するようにしたいわゆる片面めつき鋼板
の要請が強くなつた。Recently, steel plates for automobiles, home appliances, and construction materials have been plated on one side to achieve the necessary corrosion resistance. At the same time, weldability has been improved, making plated metals more effective. There was a strong demand for so-called single-sided plated steel sheets.
片面めつき鋼板は電気めつき法によつても製造できるが
、めつき速度が遅くコスト高となるので、めつき量の多
い場合はとくに溶融めつき法によるのが有利である。Single-sided plated steel sheets can also be manufactured by electroplating, but the plating speed is slow and the cost is high, so when the amount of plating is large, it is particularly advantageous to use hot-dip plating.
従来、溶融めつき法による片面めつき鋼板の製造方法と
しては、たとえば亜鉛めつきの場合では鋼板を２枚重ね
合わせ、その両縁を溶接してめつきし、後にその両縁を
切り落す方法やロール塗布、カーテンフロー塗布、その
他の特殊な方法で、溶融亜鉛を鋼板の片面のみにめつき
する方法、又は鋼板の両面に異なる厚さでめつきし、後
に薄い片面の亜鉛を酸浸漬あるいは電解によつて除去す
る方法、さらにはあらかじめ鋼板の片面に溶融めつき阻
止剤を塗布してからめつきし、後に皮膜を該阻止剤とと
もに剥離し除去する方法など数多くの提案がなされてい
る。Conventionally, methods for manufacturing single-sided galvanized steel sheets using the hot-dip galvanizing method include, for example, in the case of galvanizing, two steel plates are stacked together, both edges are welded and plated, and both edges are then cut off. Either roll coating, curtain flow coating, or other special methods are used to apply molten zinc to only one side of the steel plate, or both sides of the steel plate are plated at different thicknesses, and then a thinner layer of zinc is applied by dipping in an acid or electrolytically. A number of proposals have been made, including a method in which the film is removed by applying a melt-melting inhibitor to one side of the steel sheet before plating, and then the film is peeled off together with the inhibitor.
しかし、これらの方法には、技術的に実施が極めて困難
であつたり、製造費が高くなるなど欠点が多く、商業的
生産規模て成功した例はほとんどない。However, these methods have many drawbacks, such as being technically extremely difficult to implement and having high manufacturing costs, and there are few examples of success on a commercial scale.
この発明は、最後にのべた溶融めつき阻止剤を使用する
方法にかかわるもので、ここてはとくに”十分にその機
能を果す溶融めつき阻止剤を用いることで、良質の片面
亜鉛めつき銅板を得んとするものてある。This invention relates to a method of using the hot-dip anti-stick agent, which is applied at the end, and is particularly concerned with ``using a hot-dip anti-stick agent that fully performs its function, to improve the quality of high-quality single-sided galvanized copper sheets. There are things that you try to get.
要するに、この発明方法の実施に当り一番問題になるこ
とは、前記溶融めつき阻止剤自体の特性が悪いために、
焼鈍中に分解したり剥・離するといつたことが起り、ま
た剥離性が悪いといつたことのために、完全な不めつさ
面を得ることが難しいこと、および外観性状が損われる
という欠点を持つたことである。そこで、この発明は、
前述のような阻止剤の特性が悪いため良質の製品が得ら
れないという従来技術の欠点を解消した片面亜鉛めつき
鋼板の製造方法について提案するものである。In short, the biggest problem when implementing the method of this invention is that the properties of the melt sticking inhibitor itself are poor.
It has been reported that decomposition, peeling, and peeling occur during annealing, and that peeling properties are poor, making it difficult to obtain a completely flawless surface and impairing the appearance. It's about having flaws. Therefore, this invention
The present invention proposes a method for producing a single-sided galvanized steel sheet that overcomes the drawback of the prior art in that high-quality products cannot be obtained due to the poor properties of the inhibitor as described above.
すなわち、本発明者らの研究によれば、ＭｇＯを溶融め
つき阻止剤原料として用いる場合、該溶融めつき阻止剤
としての望ましい諸特性というのがあり、とくにＭｇＯ
を特定の形態にしたものでなければ、良質の片面めつぎ
鋼板の製造は難しいということを知見したのである。そ
の構成の要旨とするところは、冷延鋼板の片面にＭｇＯ
を含む溶融めつき阻止剤を塗布し、乾燥後、常法により
前記冷延鋼板を焼鈍し、溶融亜鉛めつき浴中を通板めつ
きしたのち、前記溶融めつき阻止剤を剥離することによ
り、片面溶融亜鉛めつき鋼板を製造する方法において、
比表面積を示すＢＥＴ値が１０〜７０７７１′／ｙの範
囲であるＭｇＯを含む前記溶融めつき阻止剤を使つて、
塗布、めつき、剥離の処理をすることを特徴とする片面
溶融亜鉛めつき鋼板の製造方法で−ある。以下にその構
成の詳細を実施例によつて説明する。この発明は、マグ
ネシウム（ＭｇＯ）、水ガラス（Ｎａ２Ｏ−ＳｉＯ２）
、ほう酸（Ｈ３ＢＯ３）、アルカリ（ＮａＯＨ）、およ
びＴｉＯ２からなるものを適量の水に，溶解ないし分散
させた水スラリー（溶融めつき阻止剤）を調整し、これ
を鋼板の片面にのみ塗布し、普通の連続溶融亜鉛めつき
と同様にして、連続焼鈍（約７００゜Ｃ）を経てから、
溶融めつき金属浴中を通過させ、前記溶融めつき阻止剤
を塗布し．”ていない鋼板の片面にのみめつきを付着さ
せる方法てある。That is, according to the research of the present inventors, when MgO is used as a raw material for a melt sticking inhibitor, there are various desirable properties as the melt sticking inhibitor.
They discovered that it is difficult to manufacture high-quality single-faced steel sheets unless they are made into a specific form. The gist of the structure is that MgO is applied to one side of the cold-rolled steel sheet.
After drying, the cold-rolled steel sheet is annealed by a conventional method, and the plate is plated through a hot-dip galvanizing bath, and then the hot-dip galvanizing agent is peeled off. , in a method of manufacturing a single-sided hot-dip galvanized steel sheet,
Using the melt sticking inhibitor containing MgO having a BET value indicating a specific surface area in the range of 10 to 70771'/y,
This is a method for producing a single-sided hot-dip galvanized steel sheet, which is characterized by coating, plating, and peeling treatments. The details of the configuration will be explained below using examples. This invention uses magnesium (MgO), water glass (Na2O-SiO2)
, prepare a water slurry (molten galvanizing inhibitor) consisting of boric acid (H3BO3), alkali (NaOH), and TiO2 dissolved or dispersed in an appropriate amount of water, and apply this to only one side of the steel plate, After continuous annealing (approximately 700°C) in the same way as ordinary continuous hot-dip galvanizing,
Pass through a hot-dip metal bath and apply the hot-dip anti-glue agent. ``There is a method of attaching glazing to one side of a steel plate that is not coated.
この溶融めつき阻止剤の鋼板片面への塗膜は、濡れ性が
極めて悪いので、該塗膜上への亜鉛の付着は殆ど起らな
いめつき後、該塗膜を鋼板から除去しなければならない
が、この発明の溶！融めつき阻止剤を使用した場合は、
めつき浴から＊ゞ引き上げた鋼板を約１００℃以上の温
度から急冷することによつて、塗膜を容易に剥離するこ
とができ、前述した片面亜鉛めつき鋼板を製造すること
ができる。次に実施例について説明する。The coating film of this hot-dip galvanizing agent on one side of the steel plate has extremely poor wettability, so the coating film must be removed from the steel plate after plating, since almost no zinc will adhere to the coating film. However, this invention does not work! If a melting inhibitor is used,
By rapidly cooling the steel sheet taken out of the plating bath from a temperature of about 100° C. or higher, the coating film can be easily peeled off, and the single-sided galvanized steel sheet described above can be produced. Next, an example will be described.
実施例は、第１表に示すような溶融めつき阻止剤を適量
の水に溶解ないし分散させた水スラリーを調整し、これ
を鋼板の一面に塗布することとした。この水スラリーを
、普通のアルカリ脱脂および水洗で清浄にした冷延鋼板
の片面に、ロール塗布により１乾燥後塗布量ョとして約
５０ｙ／イの塗布をおこなつた。In the example, a water slurry was prepared by dissolving or dispersing the melted sticking inhibitor shown in Table 1 in an appropriate amount of water, and this was applied to one surface of a steel plate. This water slurry was applied by roll coating to one side of a cold-rolled steel sheet that had been cleaned by ordinary alkali degreasing and washing with water in an amount of about 50 y/y after drying.
塗布後大気開放炉で１５０℃刈Ｍｉｎの低温乾燥、９０
％Ｎ２＋１０％鴇雰囲気中で７００℃×２ｒｎｉｎの鈍
鈍、同じ雰囲気中で約５３０℃までの冷却をこの順に連
続的におこない、さらに続いて鋼板を溶融亜鉛めつき浴
に浸漬した。After coating, dry at a low temperature of 150℃ in an oven open to the atmosphere, 90℃
Annealing at 700° C. x 2 rnin in a %N2 + 10% carbon dioxide atmosphere and cooling to about 530° C. in the same atmosphere were successively carried out in this order, and then the steel plate was immersed in a hot-dip galvanizing bath.
めつき条件は浴組成を０．１８％に−Ｚｎｌ浴温を４６
５±５℃またた浸漬時間は３ｓｅｃとした。The plating conditions were: bath composition: 0.18% - Znl bath temperature: 46%
The immersion time was 5±5° C. and 3 seconds.
めつき後、鋼板をめつき浴から引き上げ、めつき浴直上
でＮ２ガスワイパーにより、めつき量を調節し、続いて
鋼板温度や約３００℃なつた時に約２０℃の水中に鋼板
を浸漬して急冷した。めつき後の鋼板は、片面は亜鉛め
つきされ、他の片面は塗膜で完全に被覆されていたが水
冷によつて塗膜は鋼板面から剥離した。After plating, the steel plate was lifted from the plating bath, the amount of plating was adjusted using an N2 gas wiper directly above the plating bath, and then the steel plate was immersed in water at about 20°C when the steel plate temperature had dropped to about 300°C. and cooled quickly. After plating, one side of the steel plate was galvanized and the other side was completely covered with a coating film, but the coating peeled off from the steel plate surface by water cooling.
ついで鋼板を水洗ブラッシングしてからプロア乾燥した
ところ片面に約１５０ｙ／ｄの均一な片面めつきが施さ
れたが、その際の溶融めつき阻止剤の諸特性とＭｇＯの
ＢＥＴ値との関係は、ＮＯ．ｌ〜２６のとおりであつた
。なお、ＢＥＴ値（Ｂｒｕｎａｕｅｒ上Ｍｍｅｔｔ一Ｔ
ｅｌｌｅｒ）とは粉粒体の比表面積を表わ指標てあつた
、一般に細粒は大きい値を示しまた小粒のものは小さい
値を示す。The steel plate was then washed with water, brushed, and then dried with a proa, resulting in a uniform single-sided plating of approximately 150 y/d on one side. , NO. It was as follows. In addition, the BET value (Mmett on Brunauer - T
eller) is an index representing the specific surface area of a powder or granule.Generally, fine particles show a large value, and small particles show a small value.
前述の実施例の場合、第１表から判るように、ＭｇＯ（
７）ＢＥＴ値が１０〜７０ｄ／ｇの範囲内において、従
来のようにめつき阻止用の塗膜が焼鈍中に分解したり、
剥離することがなく、鋼板片面の溶融亜鉛めつきを完全
に阻止することができる。In the case of the above example, as can be seen from Table 1, MgO (
7) When the BET value is within the range of 10 to 70 d/g, the coating film for preventing plating may decompose during annealing as in the past,
There is no peeling, and hot-dip galvanizing on one side of the steel plate can be completely prevented.
Claims (1)
塗布し、乾燥後、常法により前記冷延鋼板を焼鈍し、溶
融亜鉛めつき浴中を通板めつきしたのち、前記溶融めつ
き阻止剤を剥離することにより、片面溶融亜鉛めつき鋼
板を製造する方法において、比表面積を示すＢＥＴ値が
１０〜７０ｍ＾２／ｇの範囲であるＭｇＯを含む前記溶
融めつき阻止剤を使つて、塗布、めつき、剥離の処理を
することを特徴とする片面溶融亜鉛めつき鋼板の製造方
法。1. A hot-dip galvanizing agent containing MgO is applied to one side of a cold-rolled steel sheet, and after drying, the cold-rolled steel sheet is annealed by a conventional method, and the plate is plated through a hot-dip galvanizing bath. In a method for producing a single-sided hot-dip galvanized steel sheet by peeling off the galvanizing agent, the hot-dipping galvanizing agent containing MgO having a BET value indicating a specific surface area in the range of 10 to 70 m^2/g is used. A method for producing a single-sided hot-dip galvanized steel sheet, which comprises applying, plating, and peeling the steel sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55089570A JPS6053742B2 (en) | 1980-06-30 | 1980-06-30 | Manufacturing method of single-sided hot-dip galvanized steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55089570A JPS6053742B2 (en) | 1980-06-30 | 1980-06-30 | Manufacturing method of single-sided hot-dip galvanized steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5716156A JPS5716156A (en) | 1982-01-27 |
| JPS6053742B2 true JPS6053742B2 (en) | 1985-11-27 |
Family
ID=13974459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55089570A Expired JPS6053742B2 (en) | 1980-06-30 | 1980-06-30 | Manufacturing method of single-sided hot-dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6053742B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0330352Y2 (en) * | 1986-04-14 | 1991-06-27 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60106955A (en) * | 1983-11-14 | 1985-06-12 | Kawasaki Steel Corp | Production of steel sheet hot dipped on one side |
-
1980
- 1980-06-30 JP JP55089570A patent/JPS6053742B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0330352Y2 (en) * | 1986-04-14 | 1991-06-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5716156A (en) | 1982-01-27 |
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