JP6064009B1 - Manufacturing apparatus and manufacturing method of chromium-free chemical conversion coated steel sheet - Google Patents

Manufacturing apparatus and manufacturing method of chromium-free chemical conversion coated steel sheet Download PDF

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JP6064009B1
JP6064009B1 JP2015169119A JP2015169119A JP6064009B1 JP 6064009 B1 JP6064009 B1 JP 6064009B1 JP 2015169119 A JP2015169119 A JP 2015169119A JP 2015169119 A JP2015169119 A JP 2015169119A JP 6064009 B1 JP6064009 B1 JP 6064009B1
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勝顕 永田
勝顕 永田
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Nippon Steel Nisshin Co Ltd
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Abstract

【課題】めっき鋼板のクロムフリー化成処理時に生じる白色ムラを抑制することができるクロムフリー化成処理めっき鋼板の製造装置を提供する。【解決手段】本発明のクロムフリー化成処理めっき鋼板の製造装置は、めっき鋼板にクロムフリー化成処理液を塗布するアプリケータロール２を備える。このクロムフリー化成処理メッキ鋼板の製造装置において、アプリケータロールは耐酸性を有する。また、アプリケータロール２に接触可能なブレード６を更に備えており、且つブレード６が、めっき鋼板のめっき成分とクロムフリー化成処理液との反応による生成物を除去する。【選択図】図１An object of the present invention is to provide an apparatus for producing a chromium-free chemical conversion-treated plated steel sheet capable of suppressing white unevenness that occurs during chromium-free chemical conversion treatment of a plated steel sheet. An apparatus for producing a chromium-free chemical conversion-treated plated steel sheet according to the present invention includes an applicator roll 2 that applies a chromium-free chemical conversion treatment liquid to a plated steel sheet. In this chromium-free chemical conversion-plated steel sheet manufacturing apparatus, the applicator roll has acid resistance. Moreover, the blade 6 which can contact the applicator roll 2 is further provided, and the blade 6 removes the product by reaction with the plating component of a plated steel plate, and a chromium free chemical conversion liquid. [Selection] Figure 1

Description

本発明は、クロムフリー化成処理めっき鋼板の製造装置及び製造方法に関する。   The present invention relates to a manufacturing apparatus and a manufacturing method of a chromium-free chemical conversion plated steel sheet.

めっき鋼板に耐食性、耐候性、加工性等の機能を付与するために、めっき鋼板に化成処理が行われている。化成処理としては、クロム化成処理が一般に用いられてきたが、最近では、環境問題に配慮してクロムフリー化成処理も用いられてきている。
従来、クロムフリー化成処理は、コーターパンに貯められたクロムフリー化成処理液をピックアップロールで汲み上げるとともに、ピックアップロールの表面に付着したクロムフリー化成処理液をアプリケータロールの表面に転写し、このアプリケータロールによってクロムフリー化成処理液をめっき鋼板に塗布することで行われている（例えば、特許文献１及び２）。 In order to impart functions such as corrosion resistance, weather resistance, and workability to the plated steel sheet, chemical conversion treatment is performed on the plated steel sheet. As the chemical conversion treatment, chromium chemical conversion treatment has been generally used, but recently, chromium-free chemical conversion treatment has also been used in consideration of environmental problems.
Conventionally, in the chromium-free chemical conversion treatment, the chromium-free chemical conversion treatment liquid stored in the coater pan is pumped up by the pickup roll, and the chromium-free chemical conversion treatment liquid adhering to the surface of the pickup roll is transferred to the surface of the applicator roll. It is performed by applying a chromium-free chemical conversion treatment solution to a plated steel sheet by talol (for example, Patent Documents 1 and 2).

また、化成処理めっき鋼板の実際の製造ラインでは、クロム化成処理用の塗布装置とクロムフリー化成処理用の塗布装置とがそれぞれ設けられ、これらの塗布装置をめっき鋼板の通板時に選択して使用することにより、クロム化成処理及びクロムフリー化成処理が繰り返し連続的に行われている。このような製造ラインにおいて、めっき鋼板にクロム化成処理を行う場合、クロムフリー化成処理用の塗布装置は待機状態となる。待機状態では、アプリケータロールがめっき鋼板から離れた位置で保持されており、コーターパンとアプリケータロールとの間をクロムフリー化成処理液が循環した状態となる。クロム化成処理からクロムフリー化成処理に切り替える場合、クロム化成処理用の塗布装置を待機状態とし、クロムフリー化成処理用の塗布装置のアプリケータロールをめっき鋼板と接触させる。   Also, in the actual production line for chemical conversion-treated plated steel sheets, a coating device for chrome chemical conversion treatment and a coating device for chrome-free chemical conversion treatment are provided, and these coating devices are selected and used when the plated steel plate is passed. By doing so, the chromium chemical conversion treatment and the chromium-free chemical conversion treatment are repeatedly performed continuously. In such a production line, when chromium conversion treatment is performed on a plated steel sheet, the coating apparatus for chromium-free chemical conversion treatment is in a standby state. In the standby state, the applicator roll is held at a position away from the plated steel sheet, and the chromium-free chemical conversion treatment liquid is circulated between the coater pan and the applicator roll. When switching from the chrome conversion treatment to the chrome-free conversion treatment, the chrome conversion treatment coating device is set in a standby state, and the applicator roll of the chrome-free conversion treatment coating device is brought into contact with the plated steel sheet.

特開２０１３−１３２５９４号公報JP 2013-132594 A 特開２０１１−４２８３４号公報JP 2011-42834 A

上記のような製造ラインにおいて、クロム化成処理からクロムフリー化成処理に切り替える場合、切り替え直後のめっき鋼板の全体にわたって白色ムラが生じ、品質の劣化及び歩留の低下が起こることがある。この白色ムラの原因を調査したところ、めっき鋼板のめっき成分とクロムフリー化成処理液との反応による生成物、及びアプリケータロールの腐食分解物が、アプリケータロールを介してめっき鋼板の表面に付着することが主な原因であることがわかった。
白色ムラは、クロム化成処理からクロムフリー化成処理に切り替える場合に主に起こるため、クロム化成処理及びクロムフリー化成処理をそれぞれ集約し、クロム化成処理からクロムフリー化成処理への切り替えを少なくすれば良いと考えられる。しかしながら、この方法では、幅及び／又は厚さが同一でないめっき鋼板を、繋ぎ板を介して溶接にて接続する必要がある。そのため、ラインの生産能率が低下すると共に、汚れも付着し易くなり、製品品質が低下することもある。 In the production line as described above, when switching from the chrome conversion treatment to the chrome-free conversion treatment, white unevenness may occur over the entire plated steel sheet immediately after the change, resulting in deterioration in quality and yield. As a result of investigating the cause of this white unevenness, the product of the reaction between the plating component of the plated steel sheet and the chromium-free chemical conversion treatment solution and the corrosion decomposition product of the applicator roll adhere to the surface of the plated steel sheet through the applicator roll. It turned out to be the main cause.
Since white unevenness mainly occurs when switching from chrome conversion treatment to chrome-free conversion treatment, it is only necessary to consolidate chrome conversion treatment and chrome-free conversion treatment, respectively, and reduce switching from chrome conversion treatment to chrome-free conversion treatment. it is conceivable that. However, in this method, it is necessary to connect plated steel sheets whose widths and / or thicknesses are not the same by welding via a connecting plate. For this reason, the production efficiency of the line is lowered, dirt is also easily attached, and the product quality may be lowered.

本発明は、前記のような問題を解決するためになされたものであり、めっき鋼板のクロムフリー化成処理時に生じる白色ムラを抑制することができるクロムフリー化成処理めっき鋼板の製造装置及び製造方法を提供することを目的とする。   The present invention has been made to solve the above-described problems, and provides a manufacturing apparatus and a manufacturing method for a chromium-free chemical conversion-treated plated steel sheet that can suppress white unevenness that occurs during the chromium-free chemical conversion treatment of a plated steel sheet. The purpose is to provide.

本発明者らは、上記の問題を解決すべく鋭意研究した結果、耐酸性を有するアプリケータロールを用いることでアプリケータロールの腐食を抑制すると共に、めっき鋼板のめっき成分とクロムフリー化成処理液との反応による生成物を除去するブレードをアプリケータロールに設けることにより、白色ムラの発生を低減し得ることを見出した。   As a result of diligent research to solve the above problems, the present inventors suppressed corrosion of the applicator roll by using an acid-resistant applicator roll, and plated components of the plated steel sheet and a chromium-free chemical conversion treatment solution. It has been found that the occurrence of white unevenness can be reduced by providing the applicator roll with a blade that removes the product resulting from the reaction with.

すなわち、本発明は、クロム化成処理及びクロムフリー化成処理が繰り返し連続的に行われる製造ラインに用いられ、且つめっき鋼板にクロムフリー化成処理液を塗布するアプリケータロールを備えるクロムフリー化成処理めっき鋼板の製造装置であって、
前記アプリケータロールが耐酸性を有し、
前記アプリケータロールに接触可能なブレードを更に備えており、且つ前記ブレードが、前記めっき鋼板のめっき成分とクロムフリー化成処理液との反応による生成物を除去することを特徴とするクロムフリー化成処理めっき鋼板の製造装置である。 That is, the present invention is a chromium-free chemical conversion plated steel sheet that is used in a production line in which chromium conversion treatment and chromium-free chemical conversion treatment are repeatedly and continuously performed, and includes an applicator roll that applies a chromium-free chemical conversion treatment liquid to the plated steel sheet. Manufacturing equipment,
The applicator roll has acid resistance;
A chromium-free chemical conversion treatment, further comprising a blade capable of contacting the applicator roll, wherein the blade removes a product resulting from a reaction between a plating component of the plated steel sheet and a chromium-free chemical conversion treatment liquid. It is a manufacturing apparatus of a plated steel plate.

また、本発明は、クロム化成処理及びクロムフリー化成処理が繰り返し連続的に行われる製造ラインにおいて、めっき鋼板にクロムフリー化成処理を行う前に、前記化成処理めっき鋼板の製造装置を用い、前記アプリケータロールの表面に前記ブレードを接触させることにより、前記めっき鋼板のめっき成分と前記クロムフリー化成処理液との反応による生成物を除去することを特徴とするクロムフリー化成処理めっき鋼板の製造方法である。 Further, the present invention provides a manufacturing line in which a chromium conversion treatment and a chromium-free conversion treatment are repeatedly and continuously performed, before the chromium-free conversion treatment is performed on the plated steel plate, by using the apparatus for manufacturing a chemical conversion-treated plated steel plate. By bringing the blade into contact with the surface of the talol, the product of the reaction between the plating component of the plated steel sheet and the chromium-free chemical conversion treatment liquid is removed. is there.

本発明によれば、めっき鋼板のクロムフリー化成処理時に生じる白色ムラを抑制することができるクロムフリー化成処理めっき鋼板の製造装置及び製造方法を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the manufacturing apparatus and manufacturing method of a chromium free chemical conversion treatment plated steel plate which can suppress the white nonuniformity produced at the time of the chromium free chemical conversion treatment of a plated steel plate can be provided.

本発明のクロムフリー化成処理めっき鋼板の製造装置を示す構成図である。It is a block diagram which shows the manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate of this invention.

以下、本発明のクロムフリー化成処理めっき鋼板の製造装置及び製造方法の好適な実施の形態につき図面を用いて説明する。   Hereinafter, preferred embodiments of a manufacturing apparatus and a manufacturing method of a chromium-free chemical conversion plated steel sheet according to the present invention will be described with reference to the drawings.

本発明のクロムフリー化成処理めっき鋼板の製造装置は、めっき鋼板にクロムフリー化成処理液を塗布するアプリケータロールを備える。
図１は、本発明の一実施形態として、めっき鋼板１の上面及び下面にクロムフリー化成処理液を塗布するためのクロムフリー化成処理めっき鋼板の製造装置を示す。めっき鋼板１の上面側には、めっき鋼板１にクロムフリー化成処理液を転写するアプリケータロール２と、コーターパン５に溜められたクロムフリー化成処理液を汲み上げるピックアップロール３と、アプリケータロール２とピックアップロール３との間に設けられ、ピックアップロール３で汲み上げたクロムフリー化成処理液をアプリケータロール２に転写するトランスファロール４とを備える３段ロールコータが設けられている。他方、めっき鋼板１の下面側には、鋼板１にクロムフリー化成処理液を転写するアプリケータロール２と、コーターパン５に溜められたクロムフリー化成処理液を汲み上げてアプリケータロール２に転写するピックアップロール３とを備える２段ロールコータが設けられている。そして、上面側及び下面側の各ロールコータは、めっき鋼板１を介して対向するように設けられている。なお、図１では、めっき鋼板１の上面側に３段ロールコータ、めっき鋼板１の下面側に２段ロールコータを用いた例を示したが、上面側及び下面側に用いられるロールコータの種類は当該組み合わせに限定されるものではない。 The manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate of this invention is equipped with the applicator roll which apply | coats a chromium free chemical conversion treatment liquid to a plating steel plate.
FIG. 1 shows an apparatus for producing a chromium-free chemical conversion treated steel sheet for applying a chromium-free chemical conversion treatment liquid to the upper and lower surfaces of a plated steel sheet 1 as one embodiment of the present invention. On the upper surface side of the plated steel plate 1, an applicator roll 2 that transfers the chromium-free chemical conversion treatment liquid to the plated steel plate 1, a pickup roll 3 that pumps up the chromium-free chemical conversion treatment solution stored in the coater pan 5, and an applicator roll 2. And a pick-up roll 3, and a three-stage roll coater provided with a transfer roll 4 that transfers the chromium-free chemical conversion liquid pumped up by the pick-up roll 3 to the applicator roll 2. On the other hand, on the lower surface side of the plated steel plate 1, the applicator roll 2 that transfers the chromium-free chemical conversion treatment liquid to the steel plate 1 and the chromium-free chemical conversion treatment solution stored in the coater pan 5 are pumped and transferred to the applicator roll 2. A two-stage roll coater including a pickup roll 3 is provided. The roll coaters on the upper surface side and the lower surface side are provided so as to face each other with the plated steel plate 1 interposed therebetween. 1 shows an example in which a three-stage roll coater is used on the upper surface side of the plated steel sheet 1 and a two-stage roll coater is used on the lower surface side of the plated steel sheet 1, but the types of roll coaters used on the upper surface side and the lower surface side are shown. Is not limited to the combination.

アプリケータロール２は、耐酸性を有していれば特に限定されない。ここで、本明細書において「耐酸性を有するアプリケータロール２」とは、アプリケータロール２をクロムフリー化成処理液に４０℃で７日間接触させた場合に、表面に分解物が目視にて確認されないものを意味する。耐酸性を有するアプリケータロール２を用いることにより、クロムフリー化成処理液との接触によるアプリケータロール２の腐食抑制効果を高めることができるため、めっき鋼板１のクロムフリー化成処理時に生じる白色ムラを抑制することができる。   The applicator roll 2 is not particularly limited as long as it has acid resistance. Here, in this specification, “applicator roll 2 having acid resistance” means that when the applicator roll 2 is brought into contact with the chromium-free chemical conversion treatment solution at 40 ° C. for 7 days, the decomposition product is visually observed on the surface. It means something that is not confirmed. By using the applicator roll 2 having acid resistance, the corrosion suppression effect of the applicator roll 2 due to contact with the chromium-free chemical conversion treatment liquid can be enhanced. Can be suppressed.

本発明に用いるのに好ましいアプリケータロール２としては、クロムフリー化成処理液と接触させた際（例えば、クロムフリー化成処理液に４０℃で７日間接触させた際）に、硬度、重量、引張強度及び引張伸びの変化率が、ウレタンゴムを主成分として含む表層を有するロールと同等以下であるものが好ましい。このような特性を有するアプリケータロール２としては、フッ素ゴム、エチレンプロピレンジエンゴム（ＥＰＤＭ）などを主成分として含む表層を有するロールが挙げられる。ここで、本明細書において「主成分」とは、成分全体に占める割合が５０質量％を超える成分のことを意味する。   As an applicator roll 2 preferable for use in the present invention, hardness, weight, tension when contacted with a chromium-free chemical conversion treatment solution (for example, when contacted with a chromium-free chemical conversion treatment solution at 40 ° C. for 7 days) It is preferable that the rate of change in strength and tensile elongation is equal to or less than that of a roll having a surface layer containing urethane rubber as a main component. Examples of the applicator roll 2 having such characteristics include a roll having a surface layer containing fluorine rubber, ethylene propylene diene rubber (EPDM) or the like as a main component. Here, the “main component” in the present specification means a component whose proportion of the whole component exceeds 50% by mass.

ここで、各種ロールをクロムフリー化成処理液に４０℃で７日間接触させた際の硬度、重量、引張強度及び引張伸びの変化率、並びに分解物の発生の有無の結果を下記の表１に示す。表１中、硬度、重量、引張強度及び引張伸びの変化率の結果は、ウレタンゴムを主成分として含む表層を有するロールＡに対する相対評価であり、◎は変化率がロールＡよりも小さいこと、○は変化率がロールＡと同等であること、△は変化率がロールＡよりも大きいことを意味する。   Table 1 below shows the results of the hardness, weight, tensile strength and rate of change in tensile elongation when various rolls were brought into contact with the chromium-free chemical conversion treatment solution at 40 ° C. for 7 days, and the presence or absence of decomposition products. Show. In Table 1, the results of the rate of change in hardness, weight, tensile strength and tensile elongation are relative evaluations with respect to roll A having a surface layer containing urethane rubber as a main component, and ◎ is smaller in rate of change than roll A. ○ means that the rate of change is equivalent to that of roll A, and Δ means that the rate of change is larger than that of roll A.

Figure 0006064009
Figure 0006064009

上記の評価において、硬度（ショア硬さ）は、ＪＩＳ Ｋ６２５３−３に準拠し、タイプＡデュロメータを用い、全ての試験片の寸法（試験片の厚さを６．０ｍｍ以上）及び測定温度等を同じにして測定した。重量は重量計によって測定した。引張強度及び引張伸びは、ＪＩＳ Ｋ６２５１に準拠し、引張試験機を用い、全ての試験片の寸法及び測定温度等を同じにして測定した。分解物の発生の有無は目視にて確認した。   In the above evaluation, the hardness (Shore hardness) is based on JIS K6253-3, using a type A durometer, the dimensions of all the test pieces (the thickness of the test piece is 6.0 mm or more), the measurement temperature, etc. Measured in the same way. The weight was measured with a scale. The tensile strength and tensile elongation were measured in accordance with JIS K6251 using a tensile tester with the same dimensions and measurement temperatures of all the test pieces. The presence or absence of decomposition products was confirmed visually.

表１に示されているように、ＥＰＤＭを主成分として含む表層を有するロールＢ、フッ素ゴムを主成分として含む表層を有するロールＣ、又は合成ゴムを主成分として含む表層を有するロールＤが耐酸性を有する。その中でも、ＥＰＤＭを主成分として含む表層を有するロールＢ又はフッ素ゴムを主成分として含む表層を有するロールＣが耐酸性に優れるため好ましく、ＥＰＤＭを主成分として含む表層を有するロールＢがコスト面にも優れるためより好ましい。   As shown in Table 1, roll B having a surface layer containing EPDM as a main component, roll C having a surface layer containing fluorine rubber as a main component, or roll D having a surface layer containing synthetic rubber as a main component are acid resistant. Have sex. Among them, roll B having a surface layer containing EPDM as a main component or roll C having a surface layer containing fluorine rubber as a main component is preferable because of excellent acid resistance, and roll B having a surface layer containing EPDM as a main component is cost effective. It is more preferable because it is excellent.

また、アプリケータロール２には、アプリケータロール２に接触可能なブレード６が更に設けられている。ブレード６は、アプリケータロール２の表面に付着した、めっき鋼板１のめっき成分とクロムフリー化成処理液との反応による生成物を除去する機能を有する。ブレード６は、ドクターブレード又はドクターナイフとも呼ばれ、回転中のアプリケータロール２と接触させることにより、アプリケータロール２の表面に付着した生成物を除去する。   The applicator roll 2 is further provided with a blade 6 that can contact the applicator roll 2. The blade 6 has a function of removing a product adhered to the surface of the applicator roll 2 and reacting with a plating component of the plated steel sheet 1 and a chromium-free chemical conversion treatment liquid. The blade 6 is also called a doctor blade or a doctor knife, and removes the product attached to the surface of the applicator roll 2 by contacting with the rotating applicator roll 2.

ブレード６としては、特に限定されず、当該技術分野において公知のものを用いることができる。その中でもブレード６は、先端（刃先）が、フェルト、不織布又はスポンジであることが好ましい。このような先端を有するブレード６であれば、吸水性が高く且つ適度な柔軟性を有するため、アプリケータロール２の表面に付着した生成物の除去能力が高くなる。不織布としてはナイロン製の不織布、スポンジとしてはＰＴＦＥ、ＰＦＡ、ＦＥＰ製のスポンジなどが特に好ましい。   The blade 6 is not particularly limited, and those known in the technical field can be used. Among these, it is preferable that the tip (blade edge) of the blade 6 is felt, nonwoven fabric or sponge. Since the blade 6 having such a tip has high water absorption and moderate flexibility, the ability to remove the product attached to the surface of the applicator roll 2 is enhanced. As the non-woven fabric, a non-woven fabric made of nylon and a sponge made of PTFE, PFA, FEP, etc. are particularly preferable.

ブレード６は、アーム等の支持部材（図示していない）により、アプリケータロール２の表面に押し付けられ、ブレード６の先端（刃先）がアプリケータロール２の表面に適当な角度で接触するように支持される。
また、ブレード６は、アプリケータロール２の軸方向の全体にわたる幅を有していてもよいが、幅狭のものをアプリケータロール２の軸方向に移動可能としてもよい。アプリケータロール２の軸方向に移動可能な幅狭のブレード６を用いることにより、アプリケータロール２の表面にブレード６を均一に接触させ易くなるため、アプリケータロール２の表面に付着した生成物の除去能力が高くなる。 The blade 6 is pressed against the surface of the applicator roll 2 by a support member (not shown) such as an arm so that the tip (blade edge) of the blade 6 contacts the surface of the applicator roll 2 at an appropriate angle. Supported.
The blade 6 may have a width over the entire axial direction of the applicator roll 2, but a narrow one may be movable in the axial direction of the applicator roll 2. By using the narrow blade 6 that can move in the axial direction of the applicator roll 2, the blade 6 can be easily brought into uniform contact with the surface of the applicator roll 2. The removal ability of becomes higher.

ブレード６は、クロム化成処理及びクロムフリー化成処理が繰り返し連続的に行われる製造ラインにおいて、クロムフリー化成処理めっき鋼板の製造装置の待機状態の際にアプリケータロール２と接触させる。これにより、クロム化成処理からクロムフリー化成処理に切り替えた場合に、切り替え直後のめっき鋼板１の全体にわたって生じる白色ムラを低減することができる。   The blade 6 is brought into contact with the applicator roll 2 in a standby state of the production apparatus for the chromium-free chemical conversion-treated steel sheet in a production line where the chromium chemical conversion treatment and the chromium-free chemical conversion treatment are repeatedly and continuously performed. Thereby, when it switches from chromium chemical conversion treatment to chromium free chemical conversion treatment, the white nonuniformity which arises over the whole plated steel plate 1 immediately after switching can be reduced.

ピックアップロール３及びトランスファロール４としては、特に限定されず、当該技術分野において公知のものを用いることができる。例えば、クロムめっきなどの硬質めっきされたメタルロールをピックアップロール３及びトランスファロール４として用いることができる。   The pickup roll 3 and the transfer roll 4 are not particularly limited, and those known in the technical field can be used. For example, a hard-plated metal roll such as chrome plating can be used as the pickup roll 3 and the transfer roll 4.

本発明のクロムフリー化成処理めっき鋼板の製造装置に用いることが可能なクロムフリー化成処理液としては、特に限定されず、当該技術分野において公知のものを用いることができる。クロムフリー化成処理液の例としては、リン酸、フッ酸及びそれらの塩の少なくとも１種を含む処理液が挙げられる。このような成分を含むクロムフリー化成処理液は、めっき鋼板１のめっき成分との反応生成物（例えば、リン酸アルミ、フッ化アルミ、リン酸マグネシウム等）を生じさせる恐れがあるものの、この反応生成物はブレード６によって除去することができる。   It does not specifically limit as a chromium free chemical conversion treatment liquid which can be used for the manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate of this invention, A well-known thing can be used in the said technical field. Examples of the chromium-free chemical conversion treatment liquid include a treatment liquid containing at least one of phosphoric acid, hydrofluoric acid, and salts thereof. Although the chromium-free chemical conversion treatment liquid containing such a component may cause a reaction product (for example, aluminum phosphate, aluminum fluoride, magnesium phosphate, etc.) with the plating component of the plated steel sheet 1, this reaction The product can be removed by the blade 6.

本発明のクロムフリー化成処理めっき鋼板の製造装置に用いることが可能なめっき鋼板１としては、特に限定されず、当該技術分野において公知のものを用いることができる。めっき鋼板１の例としては、Ｚｎ−Ａｌ系めっき鋼板、Ｚｎ−Ｍｇ系めっき鋼板、Ｚｎ−Ｎｉ系めっき、Ｚｎ−Ａｌ−Ｍｇ系めっき鋼板などの亜鉛系めっき鋼板が挙げられる。   It does not specifically limit as the plated steel plate 1 which can be used for the manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate of this invention, A well-known thing can be used in the said technical field. Examples of the plated steel sheet 1 include zinc-based plated steel sheets such as Zn—Al-based plated steel sheets, Zn—Mg-based plated steel sheets, Zn—Ni-based plating, and Zn—Al—Mg-based plated steel sheets.

以下、実施例及び比較例を示して本発明を具体的に説明するが、本発明は下記の実施例及び比較例に限定されるものではない。
（実施例１）
アプリケータロール２としてＥＰＤＭを主成分として含む表層を有するロールＢ、ピックアップロール３及びトランスファロール４としてクロムめっきが施されたメタルロール、ブレード６としてフェルト（日本フェルト株式会社製ＣＡ−１）をそれぞれ用い、図１に示すクロムフリー化成処理めっき鋼板の製造装置を作製した。
このクロムフリー化成処理めっき鋼板の製造装置を、クロム化成処理及びクロムフリー化成処理が繰り返し連続的に行われる製造ラインに導入し、クロム化成処理を行った後に、クロムフリー化成処理めっき鋼板の製造装置を用いてクロムフリー化成処理を行った。この製造ラインにおいて、クロム化成処理からクロムフリー化成処理への切り替えを少なくとも３回行った。また、クロムフリー化成処理めっき鋼板の製造装置の待機状態の際にブレード６をアプリケータロール２と接触させた。ここで、クロムフリー化成処理液として、リン酸を含むクロムフリー化成処理液を用いた。また、めっき鋼板１として、Ｚｎ−Ａｌ−Ｍｇ系めっき鋼板を用いた。 EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not limited to the following Example and comparative example.
Example 1
A roll B having a surface layer containing EPDM as a main component as the applicator roll 2, a metal roll coated with chromium as the pickup roll 3 and the transfer roll 4, and felt (CA-1 manufactured by Nippon Felt Co., Ltd.) as the blade 6, respectively. Using, the manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate shown in FIG. 1 was produced.
This chrome-free chemical conversion plated steel sheet manufacturing equipment is introduced into a production line where chrome chemical conversion treatment and chromium-free chemical conversion treatment are repeatedly performed continuously, and after chrome chemical conversion treatment is performed, a chrome-free chemical conversion plated steel sheet manufacturing apparatus Was used to carry out a chromium-free chemical conversion treatment. In this production line, switching from chromium conversion treatment to chromium-free conversion treatment was performed at least three times. Further, the blade 6 was brought into contact with the applicator roll 2 when the chromium-free chemical conversion-plated steel sheet manufacturing apparatus was in a standby state. Here, a chromium-free chemical conversion treatment solution containing phosphoric acid was used as the chromium-free chemical conversion treatment solution. Further, as the plated steel sheet 1, a Zn—Al—Mg based plated steel sheet was used.

（比較例１）
アプリケータロール２としてウレタンゴムを主成分として含む表層を有するロールＡを用い、ブレード６を設けなかったこと以外は、実施例１と同様の構成を有するクロムフリー化成処理めっき鋼板の製造装置を作製し、実施例１と同様にしてクロムフリー化成処理を行った。 (Comparative Example 1)
A device for producing a chromium-free chemical conversion plated steel sheet having the same configuration as in Example 1 is prepared except that roll A having a surface layer containing urethane rubber as a main component is used as applicator roll 2 and blade 6 is not provided. Then, a chromium-free chemical conversion treatment was performed in the same manner as in Example 1.

（比較例２）
ブレード６を設けなかったこと以外は、実施例１と同様の構成を有するクロムフリー化成処理めっき鋼板の製造装置を作製し、実施例１と同様にしてクロムフリー化成処理を行った。 (Comparative Example 2)
Except that the blade 6 was not provided, an apparatus for producing a chromium-free chemical conversion-treated plated steel sheet having the same configuration as in Example 1 was produced, and the chromium-free chemical conversion treatment was performed in the same manner as in Example 1.

上記の実施例及び比較例において、クロム化成処理からクロムフリー化成処理に切り替えた際に、めっき鋼板１に生じる白色ムラの長さを目視にて評価した。白色ムラの長さは、各切り替え時の評価結果の平均値とした。
その結果、白色ムラの長さが、比較例１では２７ｍ、比較例２では６ｍであったのに対し、実施例１では３ｍと極めて短くなった。すなわち、耐酸性を有するアプリケータロール２とブレード６とを組み合わせて用いることにより、クロム化成処理からクロムフリー化成処理に切り替えた際の白色ムラの発生を低減することができた。 In the above Examples and Comparative Examples, the length of the white unevenness generated in the plated steel sheet 1 was visually evaluated when switching from the chromium chemical conversion treatment to the chromium-free chemical conversion treatment. The length of the white unevenness was an average value of the evaluation results at each switching.
As a result, the length of the white unevenness was 27 m in Comparative Example 1 and 6 m in Comparative Example 2, whereas it was as short as 3 m in Example 1. That is, by using the applicator roll 2 having acid resistance and the blade 6 in combination, it was possible to reduce the occurrence of white unevenness when switching from the chrome conversion treatment to the chrome-free conversion treatment.

以上の結果からわかるように、本発明によれば、めっき鋼板１のクロムフリー化成処理時に生じる白色ムラを抑制することができるクロムフリー化成処理めっき鋼板の製造装置及び製造方法を提供することができる。   As can be seen from the above results, according to the present invention, it is possible to provide a manufacturing apparatus and a manufacturing method of a chromium-free chemical conversion-treated plated steel sheet that can suppress white unevenness that occurs during the chromium-free chemical conversion treatment of the plated steel sheet 1. .

１ めっき鋼板、２ アプリケータロール、３ ピックアップロール、４ トランスファロール、５ コーターパン、６ ブレード。   1 plated steel plate, 2 applicator roll, 3 pickup roll, 4 transfer roll, 5 coater pan, 6 blades.

Claims (7)

クロム化成処理及びクロムフリー化成処理が繰り返し連続的に行われる製造ラインに用いられ、且つめっき鋼板にクロムフリー化成処理液を塗布するアプリケータロールを備えるクロムフリー化成処理めっき鋼板の製造装置であって、
前記アプリケータロールが耐酸性を有し、
前記アプリケータロールに接触可能なブレードを更に備えており、且つ前記ブレードが、前記めっき鋼板のめっき成分とクロムフリー化成処理液との反応による生成物を除去することを特徴とするクロムフリー化成処理めっき鋼板の製造装置。 An apparatus for producing a chromium-free chemical conversion-treated plated steel sheet , which is used in a production line in which chromium conversion treatment and chromium-free chemical conversion treatment are repeatedly performed continuously, and includes an applicator roll that applies a chromium-free chemical conversion treatment liquid to the plated steel sheet. ,
The applicator roll has acid resistance;
A chromium-free chemical conversion treatment, further comprising a blade capable of contacting the applicator roll, wherein the blade removes a product resulting from a reaction between a plating component of the plated steel sheet and a chromium-free chemical conversion treatment liquid. Plated steel plate manufacturing equipment. 前記アプリケータロールは、前記クロムフリー化成処理液と接触させた際に、硬度、重量、引張強度及び引張伸びの変化率が、ウレタンゴムを主成分として含む表層を有するロールと同等以下であることを特徴とする請求項１に記載のクロムフリー化成処理めっき鋼板の製造装置。   When the applicator roll is brought into contact with the chromium-free chemical conversion treatment solution, the change rate of hardness, weight, tensile strength and tensile elongation is equal to or less than that of a roll having a surface layer containing urethane rubber as a main component. The manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate of Claim 1 characterized by these. 前記アプリケータロールは、エチレンプロピレンジエンゴムを主成分として含む表層を有することを特徴とする請求項１又は２に記載のクロムフリー化成処理めっき鋼板の製造装置。   The said applicator roll has a surface layer which contains ethylene propylene diene rubber as a main component, The manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate of Claim 1 or 2 characterized by the above-mentioned. 前記ブレードの先端は、フェルト、不織布又はスポンジであることを特徴とする請求項１〜３のいずれか一項に記載のクロムフリー化成処理めっき鋼板の製造装置。   The apparatus for producing a chromium-free chemical conversion coated steel sheet according to any one of claims 1 to 3, wherein the tip of the blade is felt, nonwoven fabric or sponge. 前記クロムフリー化成処理液は、リン酸、フッ酸及びそれらの塩の少なくとも１種を含むことを特徴とする請求項１〜４のいずれか一項に記載のクロムフリー化成処理めっき鋼板の製造装置。   The said chromium free chemical conversion treatment liquid contains at least 1 sort (s) of phosphoric acid, a hydrofluoric acid, and those salts, The manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate as described in any one of Claims 1-4 characterized by the above-mentioned. . 前記めっき鋼板は、Ｚｎ−Ａｌ−Ｍｇ系めっき鋼板であることを特徴とする請求項１〜５のいずれか一項に記載のクロムフリー化成処理めっき鋼板の製造装置。   The said plated steel plate is a Zn-Al-Mg system plated steel plate, The manufacturing apparatus of the chromium free chemical conversion treatment plated steel plate as described in any one of Claims 1-5 characterized by the above-mentioned. クロム化成処理及びクロムフリー化成処理が繰り返し連続的に行われる製造ラインにおいて、めっき鋼板にクロムフリー化成処理を行う前に、請求項１〜６のいずれか一項に記載の化成処理めっき鋼板の製造装置を用い、前記アプリケータロールの表面に前記ブレードを接触させることにより、前記めっき鋼板のめっき成分と前記クロムフリー化成処理液との反応による生成物を除去することを特徴とするクロムフリー化成処理めっき鋼板の製造方法。 The manufacturing of the chemical conversion treatment plated steel sheet according to any one of claims 1 to 6 , before performing the chromium free chemical conversion treatment on the plated steel sheet in a production line in which the chromium chemical conversion treatment and the chromium free chemical conversion treatment are repeatedly and continuously performed. Using the apparatus, the product is removed by the reaction between the plating component of the plated steel sheet and the chromium-free chemical treatment liquid by bringing the blade into contact with the surface of the applicator roll. Manufacturing method of plated steel sheet.
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