JPH0624730B2 - Mold cleaning method - Google Patents
Mold cleaning methodInfo
- Publication number
- JPH0624730B2 JPH0624730B2 JP63314980A JP31498088A JPH0624730B2 JP H0624730 B2 JPH0624730 B2 JP H0624730B2 JP 63314980 A JP63314980 A JP 63314980A JP 31498088 A JP31498088 A JP 31498088A JP H0624730 B2 JPH0624730 B2 JP H0624730B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- powder
- cleaning
- molding
- rubber
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/70—Maintenance
- B29C33/72—Cleaning
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、メラミン樹脂粉体を使用したブラスト法によ
る金型の表面を清浄にする方法に関する。TECHNICAL FIELD The present invention relates to a method for cleaning the surface of a mold by a blast method using a melamine resin powder.
従来の技術 ゴムやウレタンの成形加工には通常金型が用いられる。
この金型の材質は一般に鉄またはアルミニウムまたはそ
れらを硬質クロムメツキしたものであり、例えば電鋳に
よつて作製される。Conventional technology Molds are usually used for molding rubber and urethane.
The material of this mold is generally iron or aluminum or a hard chrome-plated material thereof, and is manufactured by, for example, electroforming.
金型を成形加工に使用している間にゴム等の成形品を構
成する材料が金型の表面に付着するため、ある頻度で金
型の表面を洗浄し付着物質を除去する必要がある。金型
の洗浄には従来、アルカリ液による洗浄、金型洗浄ゴム
によるプレス成形洗浄、ガラスビーズ、コーンの粉、く
るみの粉を用いるブラスト法による洗浄が行なわれてき
た。Since the material forming the molded product such as rubber adheres to the surface of the mold while the mold is used for molding, it is necessary to clean the surface of the mold at a certain frequency to remove the adhered substances. Conventionally, the molds have been cleaned by cleaning with an alkaline solution, press molding with a mold cleaning rubber, and blasting with glass beads, corn powder, and walnut powder.
発明が解決しようとする問題点 アルカリ液による洗浄は、ゴム成形用金型の洗浄に一般
的に使用されている洗浄方法であり、通常カセイソーダ
液を使用し、精密且つ複雑な金型の洗浄に適する。しか
しながら、洗浄に長時間を要する。廃液処理が困難であ
るという問題を有する。また、金型の使用効率を高める
ために、金型の温度を低下させることなく、成形に使用
した直後に成形温度と概ね等しい金型温度において金型
を洗浄することが望ましいが、アルカリ液による洗浄で
は金型温度がかなり低下してしまうという問題もある。Problems to be Solved by the Invention Cleaning with an alkaline liquid is a cleaning method that is generally used for cleaning rubber molding dies, and usually uses caustic soda solution for cleaning precision and complicated dies. Suitable. However, cleaning requires a long time. There is a problem that it is difficult to treat the waste liquid. Further, in order to improve the use efficiency of the mold, it is desirable to wash the mold at a mold temperature almost equal to the molding temperature immediately after it is used for molding without lowering the temperature of the mold. There is also a problem that the mold temperature is considerably lowered in cleaning.
金型洗浄用ゴムによるプレス成形洗浄は未加硫ゴムの配
合剤の中に金型洗浄性のある薬品を配合し、ゴムの加硫
と同時に汚れをゴム表面に付着させて汚れを除去する方
法であり、金型を成形装置に取付けたまま洗浄できる利
点がある。しかしながら、大きな金型の洗浄においては
金型洗浄用ゴムの使用量が多く洗浄コストが高い、金型
の汚れが激しい場合数回の洗浄が必要である、金型の形
状が複雑な場合洗浄用ゴムが残留するおそれがある、加
硫時に刺激臭があるといつた問題がある。Press molding cleaning with rubber for mold cleaning is a method of removing chemicals by compounding chemicals with mold cleaning properties into an unvulcanized rubber compounding agent and simultaneously adhering dirt to the rubber surface at the same time as vulcanizing the rubber. Therefore, there is an advantage that the mold can be cleaned with the mold attached to the molding apparatus. However, when cleaning a large mold, the amount of rubber used for cleaning the mold is large and the cleaning cost is high.If the mold is heavily soiled, it needs to be cleaned several times. If the mold has a complicated shape, it can be cleaned. There is a problem that rubber may remain, and that there is a pungent odor during vulcanization.
ガラスビーズを使用したブラスト処理による金型洗浄に
おいては、金型の摩耗が激しい、型ダレを起こしやす
い、硬質クロムメツキの損傷を生ずる、ガラスビーズの
破砕率が高く再使用しにくいためガラスビーズ使用量が
多いという問題を有する。In mold cleaning by blasting using glass beads, the amount of glass beads used is high because the mold wears out easily, the mold easily sags, the hard chrome plating is damaged, and the glass beads are highly crushed and difficult to reuse. There are many problems.
コーンの粉やくるみの粉を使用したブラスト処理による
金型の洗浄においては、洗浄に長時間を要する、金型付
着物質の落ちがよくない、作業環境が悪く粉塵対策を要
するという問題がある。In the cleaning of the mold by the blast treatment using corn powder or walnut powder, there are problems that the cleaning takes a long time, the substance adhered to the mold does not drop well, and the working environment is bad and dust countermeasures are required.
本発明は、従来使用されてきた金型洗浄方法の有する上
記の問題点を解決する新規な金型洗浄方法を提供するこ
とを目的とする。An object of the present invention is to provide a novel mold cleaning method that solves the above-mentioned problems of the conventionally used mold cleaning methods.
本発明は、ゴムやウレタンの成形用金型の表面を摩耗す
ることなくまた型ダレを生じさせずに金型から付着物質
や汚れを除去する方法を提供することを目的とする。It is an object of the present invention to provide a method for removing adhering substances and dirt from a mold without causing abrasion of the surface of a mold for molding rubber or urethane and without causing mold sagging.
本発明の異なる目的は、成形品の成形温度と概ね等しい
金型温度を維持したまま、短時間で金型を洗浄できる方
法を提供することである。Another object of the present invention is to provide a method capable of cleaning a mold in a short time while maintaining a mold temperature substantially equal to the molding temperature of a molded product.
本発明は更に、洗浄用材料の使用量を少なくでき、洗浄
後の洗浄用材料の廃棄処理が容易な洗浄方法を提供する
ことである。It is another object of the present invention to provide a cleaning method in which the amount of cleaning material used can be reduced and disposal of the cleaning material after cleaning is easy.
問題点を解決するための手段 本発明は上記の問題点を解決するブラスト法であつて、
メラミン樹脂粉体を金型の表面に気体流と共に吹き付
け、該金型の表面から付着物質を除去する方法からな
る。Means for Solving the Problems The present invention provides a blast method for solving the above problems,
The method comprises spraying a melamine resin powder onto the surface of a mold together with a gas flow, and removing adhered substances from the surface of the mold.
また、メラミン樹脂粉体の粒度は特に限定されるもので
はないが、ＪＩＳ Ｒ−６０１−１９７３にて規定され
る、２０乃至１２０メツシユであることが好ましい。粉
体の粒子形状はいかなる形状であつてもよい。粉体の粒
子の硬度は特に限定するものではないが、モース硬度で
３乃至４であることが好ましい。粉体は硬化したメラミ
ン樹脂の塊、ペレツト等を粉砕機に粉砕することによつ
て得るとができる。Although the particle size of the melamine resin powder is not particularly limited, it is preferably 20 to 120 mesh specified by JIS R-601-1973. The particle shape of the powder may be any shape. The hardness of the powder particles is not particularly limited, but is preferably 3 to 4 in Mohs hardness. The powder can be obtained by crushing a lump of cured melamine resin, pellets or the like with a crusher.
成形終了直後の金型温度は成形に使用する材料の種類に
よつて異なるが、例えばゴムを成形加工する場合の金型
温度は１５０〜２００℃である。このような高温状態に
ある金型を洗浄するために、熱可塑性樹脂の粉体を使用
する場合、金型に接触した瞬間に熱可塑性樹脂粉体は溶
融し金型に付着するという問題を生ずる。また、金型温
度が室温に近い場合であつても、金型に吹き付けられた
粉体の品温は瞬間的に１５０℃前後に上昇し、粉体が熱
可塑性樹脂からなる場合、粉体が軟化し粉体硬度が低下
するため洗浄効果が低下するという問題もある。更に、
金型に付着した油分や溶剤に不溶であることも必要であ
る。従つて、洗浄に使用する粉体は、熱硬化性樹脂から
なることが不可欠である。The mold temperature immediately after the completion of molding varies depending on the type of material used for molding, but the mold temperature when molding rubber is 150 to 200 ° C., for example. When a thermoplastic resin powder is used to clean a mold in such a high temperature state, the thermoplastic resin powder melts and adheres to the mold at the moment of contact with the mold. . Even when the mold temperature is close to room temperature, the product temperature of the powder sprayed on the mold instantaneously rises to around 150 ° C., and when the powder is made of a thermoplastic resin, the powder is There is also a problem that the cleaning effect is deteriorated because it softens and the powder hardness decreases. Furthermore,
It is also necessary that it is insoluble in the oil and solvent attached to the mold. Therefore, it is essential that the powder used for cleaning is made of a thermosetting resin.
金型の材質および金型が使用される技術分野はいかなる
ものであつても、本発明の方法の使用に適する。金型
は、例えばゴム成形、タイヤ成形、しぼ付け、ウレタン
樹脂成形の分野で用いられる。Whatever the mold material and the technical field in which it is used, it is suitable for use in the method of the invention. The mold is used, for example, in the fields of rubber molding, tire molding, graining, and urethane resin molding.
粉体を気体流と共に吹き付ける方法は、各種ブラスト法
を用いることができるが、乾式ブラスト法が最適であ
る。乾式ブラスト法には、 (イ) 粉体をノズルより高い位置にあるタンクに投入
し、重力によつてタンク底部に設けられた排出口に落下
した粉体を圧縮気体と共にノズルから噴射させる重力式
ブラスト法、 (ロ) 粉体圧送タンク内に粉体を封入してタンクに圧縮
気体を送り込み、タンク底部に設けられた排出口から排
出した粉体を圧縮気体と共にノズルから噴射させる直圧
式ブラスト法、 (ハ) 粉体をノズルより低い位置にあるタンクに投入
し、圧縮気体のサクシヨンによつてタンク底部に設けら
れた排出口から排出された粉体を圧縮気体と共にノズル
から噴射されるサイフオン式ブラスト法、 が挙げられるが、これらのブラスト法のいずれも使用す
ることができる。Various blasting methods can be used as the method of spraying the powder with the gas flow, but the dry blasting method is most suitable. The dry blasting method is: (a) Gravity method in which powder is put into a tank located higher than the nozzle, and gravity causes the powder that has fallen to the discharge port at the bottom of the tank to be ejected from the nozzle together with compressed gas. Blast method, (b) Direct pressure blast method in which powder is packed in a powder feed tank, compressed gas is sent to the tank, and the powder discharged from the discharge port provided at the bottom of the tank is jetted from the nozzle together with the compressed gas. (C) Powder is put into a tank lower than the nozzle, and the powder discharged from the discharge port provided at the bottom of the tank by the compression gas compression is jetted from the nozzle together with the compressed gas. The blasting method can be mentioned, but any of these blasting methods can be used.
圧縮気体として通常圧縮空気を使用する。通常、その圧
力はゲージ圧３乃至１０Kg／cm２であり、ノズルからの
圧縮気体の噴射速度は５０乃至２４０m／秒である。ま
た、洗浄に使用される粉体量、圧縮気体の圧力、噴射速
度は、使用される粉体の特性、金型表面への付着物質の
付着状態によつて、適宜選択することができる。Compressed air is usually used as the compressed gas. Usually, the pressure is 3 to 10 kg / cm 2 of gauge pressure, and the injection speed of the compressed gas from the nozzle is 50 to 240 m / sec. Further, the amount of powder used for cleaning, the pressure of the compressed gas, and the jetting speed can be appropriately selected depending on the characteristics of the powder used and the state of the adhered substance adhered to the mold surface.
金型の付着物質の除去に使用された後の粉体は、サイク
ロン等の従来の後処理設備を使用して付着物質と分離回
収し、再使用することができる。The powder that has been used to remove the adhering substance on the mold can be separated and collected from the adhering substance using a conventional post-treatment facility such as a cyclone, and can be reused.
金型の洗浄は、金型を高温状態に維持したままでも室温
近くに冷却した後でも行うことができ、また金型を成形
装置に取付けたままでも成形装置から取り外した後でも
行うことができ、これらは要望される金型使用サイクル
および使用する成形装置に依存する。ゴム成形用金型あ
るいはタイヤ成形用金型の最も使用サイクルを短くする
ためには、成形完了直後に成形温度（例えば１５０℃）
に概ね維持したまま更に成形装置から金型を外すことな
く、金型を本発明の洗浄方法に従つて洗浄すればよい。Mold cleaning can be performed either while the mold is maintained at a high temperature or after it has been cooled to near room temperature, or even after the mold is attached to or removed from the molding machine. , These depend on the desired mold use cycle and the molding equipment used. In order to minimize the use cycle of the rubber molding die or tire molding die, the molding temperature (for example, 150 ° C) immediately after the molding is completed.
It is sufficient to wash the mold according to the cleaning method of the present invention without further removing the mold from the molding apparatus while maintaining the above condition.
以下図面を参照して本発明を実施例により具体的に説明
する。Hereinafter, the present invention will be specifically described by way of examples with reference to the drawings.
実施例 メラミン樹脂からなる４２乃至９０メツシユの粉度の粉
体を用いて、ゴム成形用金型の表面に付着した付着物質
の除去を行つた。除去には、直圧式ブラスト装置２０を
使用した。粉体１０をタンク２２中に投入し、圧縮空気
源からタンク２２および搬送パイプ２６圧縮空気を送り
込んだ。圧縮空気源からの圧縮空気の送り量を１Ｎm3／
分、圧力をゲージ圧５Kg／cm２とした。粉体の使用量を
０．０５〜０．１Kg／時とした。タンク２２の底部に設
けられた排出口から排出された粉体は、圧縮空気によつ
て搬送パイプ中を搬送されノズル２４を通つて噴射され
る。ノズル内径を９mmとし、ノズルからの圧縮空気の噴
射速度を１５０m／秒とし、ノズルから金型表面までの
距離を１５０乃至２００mmに保つた。ノズルから噴射さ
れた粉体を金型の表面に吹き付け、金型表面上に付着し
た付着物質を除去した。金型表面１m2当たりの粉体の吹
き付け量を４０乃至６０Kgとした。付着物質除去後の金
型表面には摩耗が認められなかつた。また金型表面上の
付着物質の残存、粉体の金型表面への付着は認められな
かつた。Example Using the powder having a fineness of 42 to 90 mesh made of melamine resin, the adhered substance adhering to the surface of the rubber molding die was removed. A direct pressure blasting device 20 was used for the removal. The powder 10 was put into the tank 22, and the tank 22 and the compressed air were conveyed from the compressed air source. The feed rate of compressed air from the compressed air source is 1 Nm 3 /
The minute and the pressure were set to a gauge pressure of 5 kg / cm 2 . The amount of powder used was 0.05 to 0.1 kg / hour. The powder discharged from the discharge port provided at the bottom of the tank 22 is carried in the carrying pipe by compressed air and jetted through the nozzle 24. The inner diameter of the nozzle was 9 mm, the jet speed of compressed air from the nozzle was 150 m / sec, and the distance from the nozzle to the surface of the mold was maintained at 150 to 200 mm. The powder sprayed from the nozzle was sprayed on the surface of the mold to remove the adhered substances adhering to the surface of the mold. The amount of powder sprayed per 1 m 2 of mold surface was 40 to 60 kg. No wear was observed on the surface of the mold after removing the adhered substances. In addition, no adhered substance remained on the mold surface and no powder adhered to the mold surface.
また、洗浄時の金型温度を測定したところ、約１５０℃
であつたが、粉体の金型への溶着は認められず、洗浄時
の金型温度が室温の場合の洗浄状態と比較しても相違は
認められなかつた。Also, when the mold temperature during cleaning was measured, it was about 150 ° C.
However, welding of the powder to the mold was not recognized, and no difference was recognized even when compared with the cleaning state when the mold temperature during cleaning was room temperature.
比較例１ 比較のために、１００乃至１２０メツシユのガラスビー
ズを使用して、上記と同様の条件にて金型表面の付着物
質の除去を行つたところ、金型表面にはガラスビーズに
よる摩耗が認められた。また、実施例と同じ時間内で金
型洗浄を行うためには、ガラスビーズの１時間あたりの
使用量は、粉体に比較して５〜１０倍を必要とした。Comparative Example 1 For comparison, when 100 to 120 mesh glass beads were used to remove the adhered substances on the mold surface under the same conditions as above, the mold surface was not worn by the glass beads. Admitted. Further, in order to perform mold washing within the same time as in the example, the amount of glass beads used per hour was required to be 5 to 10 times that of powder.
比較例２ ３０〜４０メッシュのクルミ粉を使用して、実施例と同
様の条件で、ゴム成形金型表面の付着物の除去を行った
ところ除去は不十分であった。さらに金型の表面に、油
脂分の付着が認められた。付着した油脂分は、高圧エア
では、まったく除去できず、３パーセントのカ性ソーダ
の水溶液で洗浄しなければ、除去できなかった。さらに
除去時間を数分に延長し、時間を延長するに従って、当
初の付着物の除去は進行するが、油脂分の付着がさらに
増加し、金型クリーニングの目的とする結果は得られな
かった。Comparative Example 2 When walnut powder of 30 to 40 mesh was used and the deposits on the surface of the rubber molding die were removed under the same conditions as in the example, the removal was insufficient. Further, the adhesion of oil and fat was recognized on the surface of the mold. The attached oils and fats could not be removed by high pressure air at all, and could not be removed without washing with an aqueous solution of 3% caustic soda. The removal time was further extended to several minutes, and as the time was extended, the removal of the initial deposits proceeded, but the deposition of oil and fat further increased, and the intended result of mold cleaning was not obtained.
比較例３ ３０〜４０メッシュのとうもろこし粉を使用して、実施
例と同様の条件で、ゴム成形金型の付着物の除去を行っ
た。クルミ粉を使用した時よりさらに付着物の除去は不
十分であった。クルミ粉同様に油脂分の付着を生じた。Comparative Example 3 Using corn powder of 30 to 40 mesh, the deposits on the rubber molding die were removed under the same conditions as in Example. The removal of deposits was even less than when walnut powder was used. Adhesion of oil and fat occurred as in walnut powder.
比較例４ ４２〜９０メッシュのユリア樹脂を使用し、実施例と同
様の条件でゴム成形金型表面の付着物の除去を行った。
メラミン樹脂を使用して、除去した場合と比較し、同一
の除去状態に金型の状態が得られる為には、作業時間が
約２倍かかった。さらに樹脂の消耗量は、約３倍であっ
た。価格と作業効率から、メラミン樹脂による洗浄状態
の大幅な優位性を確認した。Comparative Example 4 42-90 mesh urea resin was used and the deposits on the surface of the rubber molding die were removed under the same conditions as in Example.
As compared with the case where the melamine resin was removed, the work time was about twice as long as that for obtaining the mold state in the same removed state. Furthermore, the amount of resin consumed was about three times. From the price and work efficiency, it was confirmed that the washing condition with melamine resin was significantly superior.
比較例５ ４２〜９０メッシュのフェノール樹脂を使用して、実施
例と同様の条件で、ゴム成形金型表面の付着物の除去を
行ったところ、付着物の除去は不十分であった。さら
に、樹脂の破砕が極めて大きく、作業最中に金型の状態
を確認する事が困難な状態であり、目的とする洗浄結果
は全く得られなかった。Comparative Example 5 When the 42-90 mesh phenol resin was used to remove the deposits on the surface of the rubber molding die under the same conditions as in the examples, the deposits were not sufficiently removed. Further, the resin was crushed so much that it was difficult to check the state of the mold during the work, and the desired cleaning result could not be obtained at all.
効果 金型の表面の洗浄を本発明の付着物質除去方法にて行う
ことによつて、金型の表面から付着物質が充分除去さ
れ、且つ金型表面の摩耗、型ダレ、メツキの損傷は認め
らなかつた。また、短時間で金型の洗浄ができ、高温
（１５０℃）状態を維持しつつ、また必要に応じた成形
装置から金型を取り外すことなく、金型の洗浄ができ
る。粉体の破砕率が低く長持ちし、洗浄使用量が少なく
てよい。更に、粉体には毒性がなく、金属腐食性物質を
含んでおらず、油分や溶剤に溶けにくく、使用後の粉体
の後処理も容易である。Effect By cleaning the surface of the mold by the method for removing the adhered substance of the present invention, the adhered substance is sufficiently removed from the surface of the mold, and abrasion of the mold surface, mold sagging, and damage to the mold are confirmed. Rana Katsuta. Further, the mold can be cleaned in a short time, and the mold can be cleaned while maintaining the high temperature (150 ° C.) state and without removing the mold from the molding apparatus as needed. The crushing rate of powder is low and it lasts a long time, and the amount of cleaning used is small. Further, the powder is not toxic, contains no metal corrosive substance, is hardly dissolved in oil or solvent, and the post-treatment of the powder after use is easy.
図は、本発明を実施するのに適したブラスト装置の模式
図である。 図中、１０……粉体、２０……ブラスト装置、２２……
タンク、２４……ノズル、２６……搬送パイプ、であ
る。The figure is a schematic diagram of a blasting device suitable for practicing the present invention. In the figure, 10 ... powder, 20 ... blasting device, 22 ...
A tank, 24 ... Nozzle, 26 ... Conveying pipe.
Claims (2)
共に吹き付け、該金型の表面から付着物質を除去する方
法。1. A method of spraying melamine resin powder onto the surface of a mold together with a gas flow to remove adhered substances from the surface of the mold.
である特許請求の範囲第１項記載の方法。2. The method according to claim 1, wherein the particle size of the powder is 20 to 120 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63314980A JPH0624730B2 (en) | 1988-12-15 | 1988-12-15 | Mold cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63314980A JPH0624730B2 (en) | 1988-12-15 | 1988-12-15 | Mold cleaning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02160514A JPH02160514A (en) | 1990-06-20 |
| JPH0624730B2 true JPH0624730B2 (en) | 1994-04-06 |
Family
ID=18059977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63314980A Expired - Lifetime JPH0624730B2 (en) | 1988-12-15 | 1988-12-15 | Mold cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624730B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3558623B2 (en) * | 2002-06-07 | 2004-08-25 | プラストロン株式会社 | Mold cleaning method |
| JPWO2016136443A1 (en) * | 2015-02-25 | 2017-11-30 | 新東工業株式会社 | Nozzle assembly and surface treatment method using the nozzle assembly |
| JP6352455B1 (en) * | 2017-01-11 | 2018-07-04 | 株式会社仲田コーティング | Powder slush molding die cleaning apparatus and powder slush molding die cleaning method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2426072A (en) * | 1945-07-17 | 1947-08-19 | Du Pont | Blast cleaning |
| JPS59124137A (en) * | 1982-12-28 | 1984-07-18 | Toshiba Corp | Cleaning process of metal die |
-
1988
- 1988-12-15 JP JP63314980A patent/JPH0624730B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02160514A (en) | 1990-06-20 |
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