JP3411799B2 - Metal strip cleaning method after cold rolling - Google Patents
Metal strip cleaning method after cold rollingInfo
- Publication number
- JP3411799B2 JP3411799B2 JP28062397A JP28062397A JP3411799B2 JP 3411799 B2 JP3411799 B2 JP 3411799B2 JP 28062397 A JP28062397 A JP 28062397A JP 28062397 A JP28062397 A JP 28062397A JP 3411799 B2 JP3411799 B2 JP 3411799B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- cleaning liquid
- tank
- cleaning
- dissolved
- 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
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- Cleaning By Liquid Or Steam (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明方法は、冷間圧延後の
金属帯洗浄方法に関するものである。
【０００２】
【従来の技術】金属帯の冷間圧延においては、一般に圧
延油を用いて圧延することから圧延後の金属帯には、圧
延油が付着している。このような冷間圧延後の金属帯
は、加工性を向上するために引き続き熱処理を施すが、
この熱処理時に付着圧延油による汚れが発生する。そこ
で、冷間圧延後の金属帯を洗浄して脱脂した後、上記の
ごとき熱処理を施すものである。しかして、金属帯の洗
浄方法としては、タンク内へ洗浄液を導入し、タンク内
の洗浄液表面へ気体を圧入して高圧状態に保持して、洗
浄液表面から気体を洗浄液へ混入するとともに、気体を
洗浄液に溶存し、この気体溶存洗浄液を金属帯に噴射し
て洗浄することが特開平６−７１２３３号公報、特開平
８−２５３８８３号公報に開示されている。
【０００３】
【発明が解決しようとする課題】上記のごとき、冷間圧
延後の金属帯洗浄方法においては、洗浄液と気体の接触
面積を大きくすることが困難であり、気体を効率よく洗
浄液へ混入することができず、また、洗浄液の表面から
の気体混入に限られ、洗浄液の気体溶存量が不十分にな
ることがある。従って、気体溶存洗浄液の金属帯噴射に
よる洗浄液中での微細気泡の生成が少なくなり、満足す
べき洗浄効果が得られ難い。また、タンク内の洗浄液上
部空間を高圧に保持することから、タンクを堅固にする
必要があり、かつ、コンプレッサー等の給気系を付設す
ることになり、設備コストが高価になる。しかもコンプ
レッサー等の運転によるランニングコストも上昇する等
の課題がある。本発明方法は、このような課題を有利に
解決するためなされたものであり、高効率で気体を洗浄
液へ混入させ、しかも気体を洗浄液中へ確実かつ、十分
に溶存させた洗浄液を金属帯へ噴射して、確実に洗浄す
ることのできる冷間圧延後の金属帯洗浄方法を提供する
ことを目的とするものである。
【０００４】
【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、エゼクターによって気体を洗浄
液に混入した気体混合洗浄液を上部空間が加圧状態にあ
るタンク内へ導入して気体溶存洗浄液を生成し、この気
体溶存洗浄液を金属帯へ噴射して洗浄するとともに、タ
ンク内で発生する気体溶存洗浄液中の余剰気体を回収
し、タンク内へ導入する洗浄液に混入させて気体混合洗
浄液とし、この気体混合洗浄液をタンク内へ導入するこ
とを特徴とするものである。
【０００５】
【発明の実施の形態】上記のごとくタンク内へ導入する
気体混合洗浄液は、例えばタンク入側の洗浄液供給管に
気液混合器としてエゼクター等を設け、洗浄液を供給す
ると同時に気体として空気等を供給することによって、
気体と洗浄液との接触面積を大幅に増加させることがで
き、洗浄液に気体を短時間で大量に混入させた気体混合
洗浄液を生成してタンク内へ導入する。このようにタン
ク内へ気体混合洗浄液を導入することによって、タンク
内で攪拌作用が発生し、気体混合洗浄液の混合気体が洗
浄液中へ十分かつ、確実に溶存させることができる。な
お、後記の表１に示されるように、タンク内の上部空間
は加圧状態にある。
【０００６】このようにして、タンク内で洗浄液中へ気
体を溶存させるものであるが、溶存しなかった余剰気体
は、気泡となって洗浄液中を浮上して洗浄液表面上部の
空間へ移動するのでタンク外へ放散してもよいが、本発
明ではこの余剰気体を回収して上記のごとき気液混合器
へ供給し、不足分は新たな気体を供給（補給）して必要
量を供給することによって、設備系内の気体圧を安定し
て保持することができるので有利である。
【０００７】タンク内で気体溶存洗浄液とした後、例え
ばタンク出側の気体溶存洗浄液供給管からポンプを介し
てノズルへ高圧の気体溶存洗浄液を供給して、冷間圧延
後の金属帯へ噴射することによって、噴射した気体溶存
洗浄液は、ノズルから噴出すると同時に急速に減圧さ
せ、気体溶存洗浄液中の溶存気体が気化して微細な気泡
が多数生成する。このように気体溶存洗浄液が微細気泡
含有洗浄液となって、金属帯へ噴射衝突することから衝
突時の衝撃力とあいまって、衝突により多数の微細気泡
が破裂する衝撃力によって金属帯の付着圧延油等の異物
を確実に洗浄除去することができるものである。
【０００８】このようにして、洗浄することのできる冷
間圧延後の金属帯としては、例えば鋼帯、アルミニウム
帯、銅帯等の金属帯を有利に洗浄することがでる。
【０００９】次に、本発明方法の一例を図面によって説
明する。図１において、タンク１下部の洗浄液供給管２
に気液混合器３とポンプ４ａを設けるとともに、タンク
１上部から余剰気体回収管５を気液混合器３へ接続し、
この余剰気体回収管５に気体供給管６を設ける。一方、
タンク１に図示のごとく気体溶存洗浄液供給管７にポン
プ４ｂを介設する。かくして洗浄液をポンプ４ａを介し
て気液混合器３へ供給するとともに、気体供給管６から
気液混合器３へ気体を供給し、洗浄液へ気体を混入し溶
存させて気体溶存洗浄液を生成し、これをタンク１内へ
導入する。気体溶存洗浄液中の余剰気体は上部へ浮上し
て、余剰気体回収管５から気液混合器３へ供給するとと
もに、不足分は気体供給管６から気液混合器３へ供給す
る。このようにタンク１内で生成した気体溶存洗浄液
は、気体溶存洗浄液供給管７からポンプ４ｂを介してノ
ズル（図示せず）へ供給し、金属帯（図示せず）へ噴射
して洗浄するものである。
【００１０】
【実施例】次に、本発明方法の実施例を比較例とともに
挙げる。
【表１】【００１１】注１：洗浄液は水、気体は空気。
注２：気体混合器は、エゼクターを使用。
注３：比較例の洗浄液供給量及び供給圧は、タンクへの
供給量及び供給圧（気体混合洗浄液は使用せず）。
注４：タンク内上部空間気圧は、タンク内液表面とタン
ク天井（蓋）間の空間気圧。比較例は、コンプレッサー
により気体をタンク内上部空間へ圧入し、気体をタンク
内洗浄液表面から液中へ混入して溶存させた。
注５：上記のごとく、タンク内へ連続的に供給するとと
もに、タンクから気体溶存洗浄液をノズルへ供給して金
属帯（通板速度７５０ｍｐｍ）へ噴射洗浄した。
注６：金属帯は、Ｆｅ：鋼帯、Ａｌ：アルミニウム帯、
Ｃｕ：銅帯でそれぞれ冷間圧延後の金属帯（巾：８００
ｍｍ、板厚：０．２ｍｍ）を洗浄した。
注７：冷間圧延油は、鋼帯：カチオン系、油／水エマル
ジョンタイプの圧延油（一般に使用されているもの）、
アルミニウム帯及び銅帯はノニオン系、油／水エマルジ
ョンタイプの圧延油を使用。
注８：洗浄結果は、洗浄後の通板金属帯に白色紙を５秒
間接触させ汚れ度合を目視判断した。◎：汚れなし、
○：僅かに汚れ発生、△：薄黒汚れ発生（実用上差支え
なし）、×：黒色汚れ発生。
【００１２】
【発明の効果】本発明方法によれば、金属帯の洗浄によ
る清浄度を向上することができ、金属帯の品質及び歩留
りを高めることができる。また、十分かつ、確実に気体
を溶存させた気体溶存洗浄液を低コストで製造すること
ができる等の優れた効果が得られる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a metal strip after cold rolling. 2. Description of the Related Art In cold rolling of a metal strip, rolling oil is generally applied using a rolling oil, so that a rolling oil is attached to the metal strip after rolling. The metal strip after such cold rolling is subjected to a subsequent heat treatment in order to improve workability,
During this heat treatment, stains due to the adhering rolling oil occur. Then, after the metal strip after the cold rolling is washed and degreased, the heat treatment as described above is performed. Thus, as a method of cleaning a metal strip, a cleaning liquid is introduced into a tank, gas is injected into the cleaning liquid surface in the tank, and the state is maintained at a high pressure. Japanese Patent Application Laid-Open Nos. Hei 6-71233 and Hei 8-253883 disclose a method of dissolving in a cleaning liquid and spraying the gas-dissolved cleaning liquid onto a metal strip for cleaning. [0003] In the method for cleaning a metal strip after cold rolling as described above, it is difficult to increase the contact area between the cleaning liquid and the gas, and the gas is efficiently mixed into the cleaning liquid. In some cases, the cleaning solution is limited to gas mixing from the surface of the cleaning solution, and the amount of dissolved gas in the cleaning solution may be insufficient. Accordingly, the generation of fine bubbles in the cleaning solution by the metal band injection of the gas-dissolved cleaning solution is reduced, and it is difficult to obtain a satisfactory cleaning effect. Further, since the upper space of the cleaning liquid in the tank is maintained at a high pressure, the tank needs to be rigid, and an air supply system such as a compressor is additionally provided, which increases the equipment cost. Moreover, there is a problem that the running cost due to the operation of the compressor or the like also increases. The method of the present invention has been made in order to advantageously solve such a problem, and a gas is mixed into a cleaning solution with high efficiency, and furthermore, the gas is reliably and sufficiently dissolved in the cleaning solution, and the cleaning solution is sufficiently dissolved in the metal band. It is an object of the present invention to provide a method of cleaning a metal strip after cold rolling, which can be sprayed and reliably cleaned. [0004] In order to solve the above problems,
The invention was made to clean the gas with an ejector.
When the gas mixture cleaning liquid mixed in the liquid is
Into the tank to generate a gas-dissolved cleaning solution,
The body-dissolved cleaning solution is sprayed onto the metal strip to clean and
Excess gas in the gas-dissolved cleaning solution generated in the tank
Mixed with the cleaning solution introduced into the tank
Clean the gas and introduce this cleaning gas mixture into the tank.
It is characterized by the following . [0005] As described above, the gas-mixed cleaning liquid introduced into the tank is, for example, provided with an ejector or the like as a gas-liquid mixer in a cleaning liquid supply pipe on the tank entrance side, and simultaneously supplies the cleaning liquid with air as a gas. By supplying etc.
The contact area between the gas and the cleaning liquid can be greatly increased, and a gas mixture cleaning liquid in which a large amount of gas is mixed into the cleaning liquid in a short time is generated and introduced into the tank. By introducing the gas-mixed cleaning liquid into the tank in this manner, a stirring action occurs in the tank, and the gas mixture of the gas-mixed cleaning liquid can be sufficiently and reliably dissolved in the cleaning liquid. In addition, as shown in Table 1 below, the upper space in the tank
Is in a pressurized state. As described above, the gas is dissolved in the cleaning liquid in the tank. However, the surplus gas that has not been dissolved becomes air bubbles and floats in the cleaning liquid and moves to the space above the surface of the cleaning liquid. may be dissipated to the outside of the tank, but the present onset
In the future, this surplus gas will be recovered and supplied to the gas-liquid mixer as described above, and the shortage will be supplied (supplemented) with new gas to supply the required amount to stabilize the gas pressure in the equipment system. This is advantageous because it can be held. After the gas-dissolved cleaning liquid is formed in the tank, a high-pressure gas-dissolved cleaning liquid is supplied to the nozzle via a pump, for example, from a gas-dissolved cleaning liquid supply pipe on the tank outlet side, and is sprayed onto the cold-rolled metal strip. As a result, the jetted gas-dissolved cleaning liquid is rapidly depressurized at the same time as being ejected from the nozzle, and the dissolved gas in the gas-dissolved cleaning liquid is vaporized to generate many fine bubbles. As described above, the gas-dissolved cleaning liquid becomes a cleaning liquid containing fine bubbles, which is ejected and collides with the metal band, and is combined with the impact force at the time of collision. And the like can be reliably removed by washing. [0008] In this manner, as a metal strip after cold rolling that can be washed, for example, a metal strip such as a steel strip, an aluminum strip, and a copper strip can be advantageously washed. Next, an example of the method of the present invention will be described with reference to the drawings. In FIG. 1, a cleaning liquid supply pipe 2 below a tank 1 is shown.
Is provided with a gas-liquid mixer 3 and a pump 4a, and a surplus gas recovery pipe 5 is connected to the gas-liquid mixer 3 from above the tank 1.
A gas supply pipe 6 is provided in the surplus gas recovery pipe 5. on the other hand,
As shown, a pump 4b is interposed in the gas-dissolved cleaning liquid supply pipe 7 in the tank 1. Thus, the cleaning liquid is supplied to the gas-liquid mixer 3 via the pump 4a, the gas is supplied from the gas supply pipe 6 to the gas-liquid mixer 3, and the gas is mixed and dissolved in the cleaning liquid to generate a gas-dissolved cleaning liquid. This is introduced into the tank 1. Excess gas in the gas-dissolved cleaning liquid floats upward and is supplied from the excess gas recovery pipe 5 to the gas-liquid mixer 3, and the shortage is supplied from the gas supply pipe 6 to the gas-liquid mixer 3. The gas-dissolved cleaning liquid generated in the tank 1 is supplied from a gas-dissolved cleaning liquid supply pipe 7 to a nozzle (not shown) via a pump 4b, and is jetted to a metal band (not shown) for cleaning. It is. Next, working examples of the method of the present invention will be described together with comparative examples. [Table 1] Note 1: The cleaning liquid is water and the gas is air. Note 2: The gas mixer uses an ejector. Note 3: The cleaning liquid supply amount and supply pressure in the comparative example are the supply amount and supply pressure to the tank (without using a gas-mixed cleaning liquid). Note 4: The upper pressure in the tank is the pressure between the liquid surface in the tank and the tank ceiling (lid). In the comparative example, gas was pressed into the upper space in the tank by a compressor, and the gas was mixed into the liquid from the surface of the cleaning liquid in the tank and dissolved. Note 5: As described above, the gas was continuously supplied into the tank, and the gas-dissolved cleaning liquid was supplied from the tank to the nozzle to spray and clean the metal strip (plate passing speed: 750 mpm). Note 6: Metal strips are Fe: steel strip, Al: aluminum strip,
Cu: a metal strip after cold rolling with a copper strip (width: 800)
mm, plate thickness: 0.2 mm). Note 7: Cold rolling oil is a steel strip: cationic, oil / water emulsion type rolling oil (commonly used),
For aluminum and copper strips, use a nonionic oil / water emulsion type rolling oil. Note 8: The cleaning result was evaluated by visually checking the degree of contamination by bringing white paper into contact with the passed metal band after cleaning for 5 seconds. ◎: No stain,
：: Slight stain generation, Δ: Light black stain occurrence (no practical difference), ×: Black stain occurrence. According to the method of the present invention, it is possible to improve the cleanliness of the metal strip by washing, and to improve the quality and yield of the metal strip. Further, an excellent effect is obtained such that a gas-dissolved cleaning liquid in which a gas is dissolved sufficiently and reliably can be manufactured at low cost.
【図面の簡単な説明】 【図１】本発明方法の一例を示す側面図である。 １ タンク ２ 洗浄液供給管 ３ 気液混合器 ４ ポンプ ４ａ ポンプ ５ 余剰気体回収管 ６ 気体供給管 ７ 気体溶存洗浄液供給管 ８ 気体混合洗浄液[Brief description of the drawings] FIG. 1 is a side view showing an example of the method of the present invention. 1 tank 2 Cleaning liquid supply pipe 3 gas-liquid mixer 4 pump 4a pump 5 Excess gas recovery pipe 6 Gas supply pipe 7 Gas-dissolved cleaning liquid supply pipe 8 Gas cleaning mixture
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−253883（ＪＰ，Ａ) 特開 昭63−205195（ＪＰ，Ａ) 特開 平６−142751（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21B 45/02 330 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-253883 (JP, A) JP-A-63-205195 (JP, A) JP-A-6-142751 (JP, A) (58) Field (Int.Cl. 7 , DB name) B21B 45/02 330
Claims (1)
した気体混合洗浄液を上部空間が加圧状態にあるタンク
内へ導入して気体溶存洗浄液を生成し、この気体溶存洗
浄液を金属帯へ噴射して洗浄するとともに、タンク内で
発生する気体溶存洗浄液中の余剰気体を回収し、タンク
内へ導入する洗浄液に混入させて気体混合洗浄液とし、
この気体混合洗浄液をタンク内へ導入することを特徴と
する冷間圧延後の金属帯洗浄方法。(57) [Claims 1] A gas-mixed cleaning liquid in which gas is mixed into a cleaning liquid by an ejector is introduced into a tank whose upper space is in a pressurized state to generate a gas-dissolved cleaning liquid, and the gas-dissolved cleaning liquid is generated. Spray the cleaning liquid onto the metal strip to clean and
Excess gas in the generated gas-dissolved cleaning solution is collected and stored in a tank.
Mixed with the cleaning liquid to be introduced into the inside to make a gas mixed cleaning liquid,
A method for cleaning a metal strip after cold rolling , comprising introducing the cleaning gas mixture into a tank .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28062397A JP3411799B2 (en) | 1997-10-14 | 1997-10-14 | Metal strip cleaning method after cold rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28062397A JP3411799B2 (en) | 1997-10-14 | 1997-10-14 | Metal strip cleaning method after cold rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11114615A JPH11114615A (en) | 1999-04-27 |
| JP3411799B2 true JP3411799B2 (en) | 2003-06-03 |
Family
ID=17627638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28062397A Expired - Lifetime JP3411799B2 (en) | 1997-10-14 | 1997-10-14 | Metal strip cleaning method after cold rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3411799B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101271791B1 (en) * | 2009-12-29 | 2013-06-07 | 주식회사 포스코 | Method for cleaning metal sheet by using ozone micro-buble |
| CN105149298B (en) * | 2015-07-24 | 2019-03-19 | 黎明化工研究设计院有限责任公司 | A kind of visor cleaning system and its application method |
-
1997
- 1997-10-14 JP JP28062397A patent/JP3411799B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11114615A (en) | 1999-04-27 |
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