JP4598493B2 - Metal strip coating apparatus and coating method - Google Patents

Metal strip coating apparatus and coating method Download PDF

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JP4598493B2
JP4598493B2 JP2004341919A JP2004341919A JP4598493B2 JP 4598493 B2 JP4598493 B2 JP 4598493B2 JP 2004341919 A JP2004341919 A JP 2004341919A JP 2004341919 A JP2004341919 A JP 2004341919A JP 4598493 B2 JP4598493 B2 JP 4598493B2
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steel strip
curtain
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JP2006150184A (en
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義広 末宗
克紀 飛澤
重典 田中
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Nippon Steel Corp
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Description

本発明は、連続金属帯の両面を塗装する塗装装置及び塗装方法に関するものである。   The present invention relates to a coating apparatus and a coating method for coating both surfaces of a continuous metal strip.

金属板表面に防錆効果、電気絶縁性、あるいは意匠性等を付与する目的で、金属板に有機皮膜を形成する塗装が行われる。金属板への塗装は成形後塗装（ポストコート）から、金属板に予め塗装を行うプレコート化が進んでいる（例えばプレコート鋼板）。   For the purpose of imparting a rust preventive effect, electrical insulation or design properties to the surface of the metal plate, coating for forming an organic film on the metal plate is performed. As for the coating on the metal plate, pre-coating for pre-coating on the metal plate is progressing from post-molding coating (post coating) (for example, pre-coated steel plate).

プレコート鋼板においては、亜鉛めっき鋼板の表面に燐酸処理、クロメート処理等の化成処理をほどこし、この原板上に下塗り塗料（プライマーコート）として密着性、防錆性、原板の隠蔽性等の機能を重点とした塗膜が形成され、上塗り塗料（トップコート）として色調、光沢、硬度等の外観特性に重点を置いた塗膜が形成される。   In the pre-coated steel sheet, the surface of the galvanized steel sheet is subjected to chemical conversion treatment such as phosphoric acid treatment and chromate treatment, and as an undercoat paint (primer coat) on this original plate, functions such as adhesion, rust prevention and concealment of the original plate are emphasized. A coating film with an emphasis on appearance characteristics such as color tone, gloss, and hardness is formed as a top coating (top coat).

従来、これらの塗膜を形成する鋼帯の連続塗装ラインでの塗料の塗布工程で使用される塗装機（コータ）は、複数のロールを組み合せたロールコータが多く使用されている。   Conventionally, as a coating machine (coater) used in a coating application process in a continuous coating line of steel strips forming these coating films, a roll coater in which a plurality of rolls are combined is often used.

一方、平板上に同時に複数層の塗膜を塗装する方法として、カーテン塗装方法が知られている。特許文献１には、複数個のスロット状オリフィスで形成した複数層の流動層を相互に面対面接触するように流して複合層を形成し、この複合層を自由落下するカーテンとして、走行するウエブ（平板）上に付着し、複数層を形成する方法が記載されている。特許文献１に記載のものは、主に写真材料の製造に用いられるものであり、複数層の液膜はいずれも水溶性の液膜から形成されている。   On the other hand, a curtain coating method is known as a method for simultaneously coating a plurality of layers on a flat plate. In Patent Document 1, a plurality of fluidized layers formed by a plurality of slot-shaped orifices are flowed so as to be in face-to-face contact with each other, a composite layer is formed, and the traveling web is used as a curtain that freely falls. A method is described in which a plurality of layers are deposited on a (flat plate). The thing of patent document 1 is mainly used for manufacture of photographic material, and all the liquid films of multiple layers are formed from the water-soluble liquid film.

特許文献２には、複数層からなる有機皮膜を有する塗装金属板の製造方法が記載されている。化成処理を完了した亜鉛メッキ鋼板を使用し、スライドホッパー型カーテン塗装機により２層同時塗装を行っている。下層用塗料としてポリエステル系のプライマー塗料、上層用塗料として高分子ポリエステル系のトップコート用塗料を使用して塗装を行い、塗料を塗布した鋼板を誘導加熱炉で乾燥・硬化したところ、高鮮映性鋼板を得ることができた。   Patent Document 2 describes a method for producing a coated metal plate having an organic film composed of a plurality of layers. Using a galvanized steel sheet that has undergone chemical conversion treatment, two layers are simultaneously coated by a slide hopper type curtain coating machine. When painting using a polyester primer paint as a lower layer paint and a polymer polyester top coat paint as an upper layer paint, the coated steel sheet is dried and cured in an induction heating furnace. Steel sheet could be obtained.

特許文献３には、上面の塗装にはスライドコータを、下面の塗装にはダイコータを用いて塗装する方法が提案されている。   Patent Document 3 proposes a method in which a slide coater is used for painting the upper surface and a die coater is used for painting the lower surface.

特公昭６２−４７０７５号公報Japanese Patent Publication No.62-47075 特開平６−１９０３３５号公報JP-A-6-190335 特開平８−２５２５１９号公報JP-A-8-252519

従来、連続金属帯の表面にカーテン塗装を行い、その後連続して加熱炉で乾燥焼き付けを行う塗装方法を採用するに際しては、金属帯の片面にのみカーテン塗装する方法が実用化されていた。カーテン塗装はその原理の上から、塗装時に上を向いている面のみに塗装することができるからである。もう一方の面については、ロールコートやスプレーコートによる塗装を行い、その後金属帯を加熱炉に装入して乾燥焼き付けを行っていた。   Conventionally, when adopting a coating method in which curtain coating is performed on the surface of a continuous metal strip and then drying and baking is continuously performed in a heating furnace, a method of curtain coating only on one side of the metal strip has been put into practical use. This is because curtain coating can be applied only to the surface facing upward during painting. On the other side, roll coating or spray coating was applied, and then the metal strip was placed in a heating furnace and dried and baked.

溶融メッキ鋼板においては、鋼板の幅端部付近のメッキ目付量が幅中央部よりも多くなる傾向が見られる。このように幅方向でメッキ厚みが異なるメッキ鋼板の表面にロールコートで塗装を行うと、メッキ厚みの厚い幅端部はロールコートによる塗料の付着量が少なくなり、幅方向で塗装厚さが不均一になるという現象が見られた。   In the hot-dip galvanized steel sheet, there is a tendency that the coating weight per unit area in the vicinity of the width end of the steel sheet is larger than that in the width center. When coating is performed on the surface of a plated steel sheet having a different plating thickness in the width direction by roll coating, the coating amount of the coating by the roll coating is reduced at the wide end portion where the plating thickness is thick, and the coating thickness is not increased in the width direction. The phenomenon of becoming uniform was observed.

本発明は、連続金属帯の両面にカーテン塗装を行うに際し、両面ともカーテン塗装を行う塗装装置及び塗装方法を提供することを第１の目的とする。本発明はまた、溶融メッキ鋼板表面に塗装を行うに際し、幅方向のメッキ厚み不均一があっても塗装厚を均一にすることができる塗装装置及び塗装方法を提供することを第２の目的とする。   A first object of the present invention is to provide a coating apparatus and a coating method for performing curtain coating on both surfaces of a continuous metal strip when performing curtain coating on both surfaces. It is a second object of the present invention to provide a coating apparatus and a coating method capable of making the coating thickness uniform even when there is non-uniform plating thickness in the width direction when coating the surface of the hot dip plated steel sheet. To do.

ロールコータで塗布する場合には、狭幅から広幅材への鋼板幅変更時に鋼板エッジ模様が混入する。これは、狭幅鋼板の縁がロールコータに転写していて、この転写跡が広幅材への鋼板幅変更時に広幅鋼板に転写することで生じる。このために、常に広幅から狭幅材という塗装スケジュールを組まなければならない制約が発生する。本発明の第３の目的は、狭幅から広幅材への幅交換時に、鋼板エッジ模様の混入を防止して幅交換に対してスケジュールフリーとすることである。   When applying with a roll coater, a steel plate edge pattern is mixed when the width of the steel plate is changed from narrow to wide. This occurs because the edge of the narrow steel plate is transferred to the roll coater, and this transfer mark is transferred to the wide steel plate when the steel plate width is changed to the wide material. For this reason, there is a restriction that a painting schedule from a wide width to a narrow width must always be established. The third object of the present invention is to prevent a steel plate edge pattern from being mixed during width exchange from a narrow width to a wide width material and to make the schedule free for width exchange.

特許文献３に示した、下層をダイコータで塗装する方法は、非接触であるので、上記の課題のうち第３の目的は達成可能である。しかし、第２の目的は、膜厚がダイコータの塗料の出口と鋼板との間隔に影響されるために、塗膜の厚みの均一性を精度良く確保するためには、その間隔の調整に細心の注意を要すると考えられる。また、カーテンから落ちる塗料の慣性力によって、気泡のまきこみ等が低減させることから考えて、第１の目的である両面カーテン塗装を行うことも特許文献３とは異なる。   Since the method of painting the lower layer with a die coater shown in Patent Document 3 is non-contact, the third object of the above problems can be achieved. However, the second purpose is that the film thickness is affected by the distance between the paint coater outlet of the die coater and the steel sheet. It may be necessary to pay attention. Also, the double-sided curtain coating, which is the first object, is different from Patent Document 3 in view of the fact that air bubbles are reduced due to the inertial force of the paint falling from the curtain.

即ち、本発明の要旨とするところは以下の通りである。
（１）連続鋼帯７の両面を塗装する塗装装置であって、水平に移動する鋼帯７の一方の面であり塗装する際には上を向いておりその下方に鋼帯を支えるロールが存在しない位置の面を塗装する自由落下のカーテンを有する第１のカーテン塗装装置１ａと、塗装面を予備乾燥する予備乾燥装置１２と、水平に移動する鋼帯７の他方の面であり塗装する際には上を向いておりその下方に鋼帯を支えるロールが存在しない位置の面を塗装する自由落下のカーテンを有する第２のカーテン塗装装置１ｂと、上を向いている面と他方の面を同時に加熱焼き付けする加熱装置１３とを、この順番で鋼帯が通過するように配置してなり、第１のカーテン塗装装置１ａと第２のカーテン塗装装置１ｂとの間で鋼帯の上面となる面を反転させるためのロールを有し、前記予備乾燥装置は、当該ロールを加熱ロールとして鋼帯と接触させる予備乾燥装置であることを特徴とする鋼帯の塗装装置。
（２）連続鋼帯７が溶融メッキ鋼帯であることを特徴とする上記（１）に記載の鋼帯の塗装装置。
（３）第１のカーテン塗装装置１ａと第２のカーテン塗装装置１ｂの一方又は両方で、多層膜の同時塗装を行うことを特徴とする上記（１）又は（２）に記載の鋼帯の塗装装置。
（４）第１のカーテン塗装装置１ａの上流側に、鋼帯表面に下地塗装を行う下地塗装装置１６と、その後に鋼帯を乾燥する乾燥装置１７とを有することを特徴とする上記（１）乃至（３）のいずれかに記載の鋼帯の塗装装置。 That is, the gist of the present invention is as follows.
(1) A coating device for coating both surfaces of a continuous steel strip 7, which is one side of the steel strip 7 that moves horizontally, and when it is coated, a roll that supports the steel strip is facing upward. The first curtain coating device 1a having a free-falling curtain for painting a surface at a non-existing position, the pre-drying device 12 for pre-drying the painted surface, and the other surface of the horizontally moving steel strip 7 are coated. The second curtain coating apparatus 1b having a free-falling curtain that coats the surface at a position where the roll supporting the steel strip does not exist at the bottom, the surface facing upward, and the other surface Are arranged so that the steel strip passes in this order, and the upper surface of the steel strip between the first curtain coating device 1a and the second curtain coating device 1b. Has a roll to reverse the surface , The preliminary drying device, the coating apparatus of the steel strip, characterized in that a pre-drying device for contacting with the strip to the roll as a heating roll.
(2) The steel strip coating apparatus according to (1) above, wherein the continuous steel strip 7 is a hot dipped steel strip.
(3) The multilayer steel film is simultaneously coated with one or both of the first curtain coating apparatus 1a and the second curtain coating apparatus 1b. Painting equipment.
(4) The above-mentioned (1), characterized by having an undercoating device 16 for applying an undercoating on the surface of the steel strip and a drying device 17 for drying the steel strip thereafter on the upstream side of the first curtain coating apparatus 1a. ) To (3), the steel strip coating apparatus.

本発明は、金属帯の一方の面についてカーテン塗装を行い、次いで塗装面を予備乾燥し、予備乾燥の前後あるいは予備乾燥と同時に金属帯の上面となる面を反転させ、金属帯の他方の面についてカーテン塗を行い、その後に加熱することによって、金属帯の両面ともカーテン塗装を行うことを可能にした。   The present invention performs curtain coating on one surface of the metal strip, then pre-drys the coated surface, reverses the surface that becomes the upper surface of the metal strip before, after, or at the same time as the preliminary drying. It was possible to perform curtain coating on both sides of the metal band by applying curtain coating on the film and then heating it.

本発明はまた、両面ともカーテン塗装を行うので、幅方向のメッキ厚み不均一があっても塗装厚を均一にすることを可能にした。   The present invention also allows curtain coating on both sides, so that the coating thickness can be made uniform even if there is uneven plating thickness in the width direction.

カーテン塗装を行うためのカーテン塗装装置１としては、例えば図１に示す装置を用いることができる。カーテン塗装装置１は１又は２以上のスリット２を有し、各スリット２から液体を吐出させると、吐出した液体は液膜となり、カーテン塗装装置１の傾斜面（スライド３）に沿って流下する。液膜の幅両端はエッジガイド５によってガイドされる。図１に示すカーテン塗装装置１は第１層から第３層までの３つのスリット（２ａ〜２ｃ）を有している。第３層スリット２ｃから吐出した液膜は、第２層スリット２ｂの位置まで流下して第２層スリット２ｂから吐出した液膜に接して２層の液膜を形成し、さらにその２層の液膜は第１層スリット２ａまで流下して第１層スリット２ａから吐出した液膜に接して３層の液膜を形成する。３層の液膜はスライド３に沿って流下し、傾斜端において傾斜面から離れ、３層のカーテン６として自由落下する。カーテンの幅両端は案内装置４によってガイドされる。   For example, the apparatus shown in FIG. 1 can be used as the curtain coating apparatus 1 for performing curtain coating. The curtain coating apparatus 1 has one or more slits 2, and when the liquid is discharged from each slit 2, the discharged liquid becomes a liquid film and flows down along the inclined surface (slide 3) of the curtain coating apparatus 1. . Both width ends of the liquid film are guided by edge guides 5. The curtain coating apparatus 1 shown in FIG. 1 has three slits (2a to 2c) from the first layer to the third layer. The liquid film discharged from the third layer slit 2c flows down to the position of the second layer slit 2b and forms a two-layer liquid film in contact with the liquid film discharged from the second layer slit 2b. The liquid film flows down to the first layer slit 2a and comes into contact with the liquid film discharged from the first layer slit 2a to form a three-layer liquid film. The three-layer liquid film flows down along the slide 3, leaves the inclined surface at the inclined end, and freely falls as the three-layer curtain 6. Both ends of the curtain are guided by the guide device 4.

カーテン塗装装置１の下方には、カーテン塗装を行う対象物としての連続金属帯７が走行している。連続金属帯７の表面に落下した多層のカーテン６は、多層の状態を保持したまま連続金属帯７の表面に付着し、連続金属帯７の表面に複数層の膜が塗装される。もちろん、カーテン塗装装置１が単一のスリット２を有する場合には、連続金属帯７の表面に単層の膜が形成される。   Below the curtain coating apparatus 1, a continuous metal strip 7 is running as an object for curtain coating. The multi-layer curtain 6 dropped on the surface of the continuous metal strip 7 adheres to the surface of the continuous metal strip 7 while maintaining the multi-layer state, and a plurality of layers of films are coated on the surface of the continuous metal strip 7. Of course, when the curtain coating apparatus 1 has a single slit 2, a single layer film is formed on the surface of the continuous metal strip 7.

カーテン塗装装置１の上記特徴から明らかなように、カーテン塗装は、連続金属帯７の上を向いている面にのみ塗装を行うことが可能であり、下を向いている面にカーテン塗装を行うことはできない。そのため、従来は図４に示すように、連続金属帯７のうち上を向いている面はカーテン塗装装置１によって塗装を行い、下を向いている面についてはロールコータ１５によって塗装を行い、その後連続金属帯１を加熱炉１３に装入して乾燥・焼き付けを行っていた。   As is apparent from the above characteristics of the curtain coating apparatus 1, curtain coating can be performed only on the surface facing upward of the continuous metal strip 7, and curtain coating is performed on the surface facing downward. It is not possible. Therefore, conventionally, as shown in FIG. 4, the surface of the continuous metal strip 7 facing upward is painted by the curtain coating apparatus 1, and the surface facing downward is painted by the roll coater 15, and thereafter The continuous metal strip 1 was charged into the heating furnace 13 and dried and baked.

ロールによって連続金属帯の走行方向を１８０°反転させれば、反転前に下を向いていた面が反転後に上を向くことになる。従って、反転前に上を向いている面にカーテン塗装を行い、反転後に他の面にカーテン塗装を行うこととすれば、連続金属帯の両面ともカーテン塗装を行うことが可能となる。ところが、従来このような方法で両面にカーテン塗装を行い、最後に加熱炉に装入して乾燥・焼き付けを行うことは不可能であった。その理由は、連続金属帯の上を向いている面にカーテン塗布を行った鋼板を走行方向を１８０°反転させるためには、乾燥前の塗布鋼板がロール面に接触してしまい、塗布鋼板表面外観が悪化し、またロールに塗料が巻いてしまうためである。   If the running direction of the continuous metal strip is reversed by 180 ° by the roll, the surface facing downward before the reversal will be directed upward after the reversal. Therefore, if curtain coating is performed on the surface facing upward before reversal and curtain coating is performed on the other surface after reversal, it is possible to perform curtain coating on both sides of the continuous metal strip. However, it has been impossible in the past to perform curtain coating on both sides by such a method, and finally to charge and dry and bake in a heating furnace. The reason is that in order to reverse the traveling direction of the steel sheet on which the curtain coating is applied to the surface facing the continuous metal strip by 180 °, the coated steel sheet before drying comes into contact with the roll surface, and the coated steel sheet surface This is because the appearance deteriorates and the paint is wound on the roll.

連続金属帯の一方の面にカーテン塗装を行い、その後連続金属帯を加熱炉に装入して乾燥・焼き付けを行い、さらにロールによって連続金属帯の走行方向を１８０°反転させ、反転後に他の面にカーテン塗装を行い、再度連続金属帯を別の加熱炉に装入して乾燥・焼き付けを行うこととすれば、連続金属帯の両面にカーテン塗装を行うことは可能である。しかし、このような方法を採用したのでは、連続金属帯の処理装置に加熱炉を２基設置することが必須となり、設備新設時には設置費用が増大する。既存の設備を改造する場合には、加熱炉を１基増設することは困難であることが多い。   Curtain coating is applied to one side of the continuous metal strip, and then the continuous metal strip is placed in a heating furnace, dried and baked, and the running direction of the continuous metal strip is reversed 180 ° with a roll. It is possible to perform curtain coating on both sides of a continuous metal strip if curtain coating is applied to the surface and the continuous metal strip is again charged in another heating furnace and dried and baked. However, when such a method is adopted, it is essential to install two heating furnaces in the continuous metal strip processing apparatus, and the installation cost increases when the equipment is newly installed. When remodeling existing equipment, it is often difficult to add one heating furnace.

本発明は図２（ａ）に示すように、連続金属帯７の一方の面について第１のカーテン塗装装置１ａによってカーテン塗装を行い、次いで塗装面を予備乾燥装置１２によって予備乾燥し、予備乾燥の前後あるいは予備乾燥と同時に金属帯の上面となる面を反転させ、連続金属帯７の他方の面について第２のカーテン塗装装置１ｂによってカーテン塗装を行う。このように、連続金属帯の一方の面にカーテン塗装を行った後に予備乾燥を行うことにより、上記連続金属帯の上を向いている面にカーテン塗布を行った鋼板を走行方向を１８０°反転させる際に、塗布鋼板がロール面に接触することにより塗布鋼板表面外観が悪化し、またロールに塗料が巻いてしまうという問題が解消し、連続金属帯の２つの面を両方ともカーテン塗装してから加熱炉に装入し、一度に乾燥・焼き付けを行うことが可能となった。   In the present invention, as shown in FIG. 2 (a), one surface of the continuous metal strip 7 is subjected to curtain coating by the first curtain coating device 1a, and then the painted surface is preliminarily dried by the predrying device 12 and preliminarily dried. The surface which becomes the upper surface of the metal strip is reversed before, after or simultaneously with preliminary drying, and the other surface of the continuous metal strip 7 is subjected to curtain coating by the second curtain coating apparatus 1b. In this way, by performing preliminary drying after curtain coating on one surface of the continuous metal strip, the traveling direction of the steel sheet coated with curtain on the surface facing the continuous metal strip is reversed by 180 °. When the coated steel plate is in contact with the roll surface, the coated steel plate surface appearance is deteriorated, and the problem that the coating material is wound on the roll is solved, and the two surfaces of the continuous metal strip are both curtain-coated. It was possible to charge and dry at the same time.

本発明で行う予備乾燥は、第１にロール１１ｂ内にヒーターを内蔵した加熱ロールに鋼帯を接触させ、鋼帯温度を上昇させる方法、第２にロール１１ｂに近接させたチューブヒーターや赤外線を片面に装着した加熱装置１２で鋼帯温度を上昇させる方法、第３にパイプやノズルから熱風を鋼帯に衝突させる方法を適用すると良い。   In the preliminary drying performed in the present invention, first, a method in which a steel strip is brought into contact with a heating roll having a heater built in the roll 11b to raise the temperature of the steel strip, and second, a tube heater or an infrared ray brought close to the roll 11b is used. A method of raising the steel strip temperature with the heating device 12 mounted on one side, and thirdly, a method of causing hot air to collide with the steel strip from a pipe or nozzle may be applied.

また、カーテン塗装を行う直前に、鋼板を予備加熱する装置を設け、カーテン塗布後に、予備加熱した鋼板熱で塗膜を乾燥させる方法もある。予備加熱する装置としては、予備乾燥装置と同様の設備がある。   There is also a method of providing a device for preheating the steel plate immediately before curtain coating, and drying the coating film with preheated steel plate heat after the curtain coating. As the preheating device, there is the same equipment as the predrying device.

本発明で、金属帯の上面となる面を反転させる手段としては、図２（ａ）に示すようにロール１１ｂによって連続金属帯の走行方向を１８０°変換させる方法が最も好ましい。反転を行う時期は、予備乾燥の後あるいは予備乾燥と同時に行うことができる。予備乾燥後に反転する場合は、鋼板の平坦部で予備乾燥を行うので、カーテン塗装装置１ａとロール１１ｂの間の距離が長くなる。一方、反転と予備乾燥を同時に行う場合には、カーテン塗装装置とロールの間の距離は短くなるが、予備乾燥装置１２の形状をロールに沿って湾曲させた方が、乾燥効率が向上するので好ましい。   In the present invention, as a means for reversing the surface to be the upper surface of the metal strip, a method of changing the traveling direction of the continuous metal strip by 180 ° with a roll 11b as shown in FIG. 2 (a) is most preferable. The time of inversion can be performed after preliminary drying or simultaneously with preliminary drying. When reversing after the preliminary drying, since the preliminary drying is performed on the flat portion of the steel plate, the distance between the curtain coating apparatus 1a and the roll 11b becomes long. On the other hand, when reversing and preliminary drying are performed at the same time, the distance between the curtain coating device and the roll is shortened, but the drying efficiency is improved by curving the shape of the preliminary drying device 12 along the roll. preferable.

本発明において、連続金属帯７が溶融メッキ鋼帯であると好ましい結果を得ることができる。   In the present invention, a preferable result can be obtained when the continuous metal strip 7 is a hot-dip plated steel strip.

前述の通り、溶融メッキ鋼板においては、鋼板の幅端部付近のメッキ目付量が幅中央部よりも多くなる傾向が見られる。このように幅方向でメッキ厚みが異なるメッキ鋼板の表面にプライマーをロールコートで塗装を行うと、厚みの厚い幅端部はロールコートによる塗料の付着量が少なくなり、幅方向で塗装厚さが不均一になるという現象が見られた。例えば、厚み２０μｍの溶融亜鉛メッキを施した鋼板において、幅両端の亜鉛メッキ厚みは３０μｍ程度となり、厚さ不均一が１０μｍ程度発生する。このようなメッキ鋼板にプライマーをロールコートで塗装を行うと、塗装直後における塗装厚が幅中央で３０μｍ程度である場合、幅端部の塗装厚は２０μｍ程度となってしまう。乾燥後においても、塗装厚みの幅中央と幅端部との比率は保持されたままであり、塗装厚みの不均一が発生することとなる。   As described above, in the galvanized steel sheet, the plating basis weight in the vicinity of the width end part of the steel sheet tends to be larger than the width center part. When the primer is applied to the surface of a plated steel sheet with a different plating thickness in the width direction by roll coating, the thick end of the thick coating reduces the amount of paint applied by the roll coating, and the coating thickness is reduced in the width direction. A phenomenon of non-uniformity was observed. For example, in a steel sheet that has been hot dip galvanized with a thickness of 20 μm, the galvanized thickness at both ends of the width is about 30 μm, and a non-uniform thickness occurs about 10 μm. When such a coated steel sheet is coated with a primer by roll coating, when the coating thickness immediately after coating is about 30 μm at the center of the width, the coating thickness at the width end is about 20 μm. Even after drying, the ratio between the width center of the coating thickness and the width end portion remains maintained, and uneven coating thickness occurs.

以上のような塗装厚みの不均一を防止するため、従来はメッキ後の鋼板幅端部をトリムして除去し、メッキ厚みの均一な部分のみを用いて塗装鋼板を製造することが行われていた。   In order to prevent the uneven coating thickness as described above, conventionally, the coated steel sheet is manufactured using only the uniform part of the plating thickness by trimming and removing the width end of the steel sheet after plating. It was.

本発明においては、溶融メッキ鋼帯の両面ともカーテン塗装によって塗装を行うので、たとえ鋼帯の幅方向でメッキ厚みが異なっていたとしても、幅方向で塗装厚さを均一に保持することが可能となる。従って、メッキ後の鋼板幅端部をトリムすることなくメッキ後塗装鋼板を製造することができ、鋼板製造の歩留りを向上することが可能となる。   In the present invention, both surfaces of the hot-dip steel strip are coated by curtain coating, so even if the plating thickness differs in the width direction of the steel strip, it is possible to keep the coating thickness uniform in the width direction. It becomes. Therefore, it is possible to manufacture a post-plated coated steel plate without trimming the plated steel plate width end, and it is possible to improve the yield of steel plate manufacturing.

本発明は、第１のカーテン塗装装置と第２のカーテン塗装装置の一方又は両方で、多層膜の同時塗装を行うと好ましい。   In the present invention, it is preferable to perform simultaneous coating of the multilayer film with one or both of the first curtain coating apparatus and the second curtain coating apparatus.

塗装メッキ鋼板においては、鋼板表面にメッキ処理を行った後、まず下地塗装として後処理膜（クロメート膜、ノンクロメート膜）を塗布し、次に有機塗料などを用いた塗装を行う。従来は、プライマーの形成をロールコートによって行っていた。上述の通り、幅方向でメッキ厚みが異なるメッキ鋼板の表面にロールコートで塗装を行うと、幅方向で後処理膜の厚さが不均一になる。   In a coated steel sheet, after plating the steel sheet surface, first a post-treatment film (chromate film, non-chromate film) is applied as a base coating, and then coating with an organic paint or the like is performed. Conventionally, the primer is formed by roll coating. As described above, when the surface of a plated steel sheet having a different plating thickness in the width direction is coated by roll coating, the thickness of the post-treatment film becomes non-uniform in the width direction.

これに対し、カーテン塗装で多層膜の同時塗装を行い、鋼帯に接する側の層として上記プライマーのための層を形成し、それ以外の層として有機塗料などを用いた塗装膜のための層を形成することとすれば、プライマーの膜も上層の塗装膜もともにカーテン塗装によって塗装されることとなり、いずれの膜も幅方向の厚み不均一のない良好な膜とすることができる。   On the other hand, a multilayer coating is simultaneously applied by curtain coating, a layer for the primer is formed as a layer in contact with the steel strip, and a layer for a coating film using an organic paint or the like as the other layer. If both are formed, both the primer film and the upper coating film are applied by curtain coating, and both films can be made good films with no uneven thickness in the width direction.

このようにプライマーの膜の膜厚が板幅方向で均一になることにより、耐食性や加工特性を均一化することができる。   Thus, by making the film thickness of the primer film uniform in the plate width direction, the corrosion resistance and processing characteristics can be made uniform.

両面に多層膜の同時塗布をする前の鋼板としては、溶融メッキや電気メッキ鋼帯上にクロメート膜やノンクロメート膜を事前に塗布したものを用いても良い。   As the steel plate before simultaneous application of the multilayer film on both sides, a steel plate in which a chromate film or a non-chromate film is previously applied on a hot dipped or electroplated steel strip may be used.

もちろん図２（ｂ）に示すように、第１のカーテン塗装装置１ａの前面に、金属帯表面に下地塗装を行う下地塗装装置１６と、その後に金属帯を乾燥する乾燥装置１７とを配置しても良い。これにより、下地塗装として後処理膜を塗布して乾燥を完了した後、金属帯の表裏面にカーテン塗装によって塗装を行うことができる。   Of course, as shown in FIG. 2 (b), on the front surface of the first curtain coating apparatus 1a, a base coating apparatus 16 for performing base coating on the surface of the metal strip and a drying apparatus 17 for drying the metal strip are disposed thereafter. May be. Thereby, after apply | coating a post-process film | membrane as base coating and completing drying, it can coat by the curtain coating on the front and back of a metal strip.

以上の本発明の説明において、塗装装置としてはカーテン塗装装置を用いる場合について説明を行った。ところで、均一な膜厚の塗装を行う方法として、カーテン塗装装置に替えてスライドビード塗装装置を用いることができる。カーテン塗装装置を用いる場合には、原則として自由落下カーテンが被着する位置における金属帯は水平に保っているが、スライドビード装置を用いる場合は、ビードが被着する位置における金属帯の角度は水平である必要はなく、水平に対して１００°程度まで傾いていても良い。従って、図３に示すように、金属帯の向きをロールによって変更するに際し、ロールに接した途中における金属帯にスライドビード装置１４を用いて塗装を行うこととしても良い。   In the above description of the present invention, the case where a curtain coating apparatus is used as the coating apparatus has been described. By the way, as a method of performing coating with a uniform film thickness, a slide bead coating apparatus can be used instead of the curtain coating apparatus. When using a curtain coating device, as a rule, the metal band at the position where the free fall curtain adheres is kept horizontal, but when using a slide bead device, the angle of the metal band at the position where the bead is applied is It does not need to be horizontal, and may be inclined to about 100 ° with respect to the horizontal. Therefore, as shown in FIG. 3, when the direction of the metal band is changed by the roll, the metal band in the middle of contact with the roll may be coated using the slide bead device 14.

金属帯の両面に塗装を行った後、金属帯７を加熱装置１３に装入して加熱し、乾燥・焼き付けを行う。加熱装置１３としては、誘導加熱装置、熱風ガス乾燥装置、遠赤外炉・近赤外炉を用いることができる。   After coating on both sides of the metal strip, the metal strip 7 is loaded into the heating device 13 and heated to dry and bake. As the heating device 13, an induction heating device, a hot air gas drying device, a far infrared furnace or a near infrared furnace can be used.

電気亜鉛メッキ鋼板あるいは溶融亜鉛メッキ鋼板の両面に塗装を行うに際し、本発明を適用した。表１に示す実施例１〜４の条件を用いた。   The present invention was applied when coating on both surfaces of an electrogalvanized steel sheet or a hot-dip galvanized steel sheet. The conditions of Examples 1 to 4 shown in Table 1 were used.

Figure 0004598493
Figure 0004598493

塗装装置として、参考例１、実施例２、４は図２（ａ）に示すように、上面、裏面ともにカーテン塗装装置１を用い、参考例３は図３に示すように、上面がカーテン塗装装置１、裏面がスライドビード塗装装置１４である。 As shown in FIG. 2A, Reference Example 1, Example 2 and 4 used the curtain coating apparatus 1 for both the upper surface and the rear surface as a coating apparatus, and in Reference Example 3 , the upper surface was curtain coated as shown in FIG. The apparatus 1 has a slide bead coating apparatus 14 on the back side.

参考例１、実施例２の両面、参考例３の裏面は塗装装置でポリエステル系塗料を１層のみ塗装している。これらの場合における下地塗装は、ノンクロメート系塗料とした。参考例３の上面と実施例４の両面はカーテン塗装装置で２層の塗装を行い、下地塗料としてノンクロメート系塗料またはクロメート系塗料を塗布し、その上層にポリエステル系塗料を同時塗布している。 The both surfaces of Reference Example 1 and Example 2 and the back surface of Reference Example 3 are coated with only one layer of polyester-based paint with a coating apparatus. The base coating in these cases was a non-chromate paint. The upper surface of Reference Example 3 and both surfaces of Example 4 are coated with two layers using a curtain coating apparatus, and a non-chromate paint or a chromate paint is applied as a base paint, and a polyester paint is simultaneously applied to the upper layer. .

予備乾燥装置１２として、参考例１は図２（ａ）に示すように赤外線式の予備乾燥装置１２を用い、実施例２、４はパス変更ロール１１ｂそのものを加熱ロール（誘導加熱ロール）として鋼板の予備乾燥を行う。参考例３については、上面はスライドビード塗布装置１４でポリエステル系塗料を１層塗布し、下面はカーテン塗装装置１ｂでクロメート系塗料とポリエステル系塗料の２層を同時塗布するとしている。 As the pre-drying device 12, the reference example 1 uses an infrared pre-drying device 12 as shown in FIG. 2A, and the examples 2 and 4 are steel plates using the path changing roll 11b itself as a heating roll (induction heating roll). Pre-drying is performed. In Reference Example 3, it is assumed that one layer of polyester paint is applied to the upper surface by the slide bead coating device 14 and two layers of chromate paint and polyester paint are simultaneously applied to the lower surface by the curtain coating device 1b.

両面を乾燥する加熱炉１３としては、いずれの実施例もガス加熱炉を用いている。   As the heating furnace 13 for drying both surfaces, a gas heating furnace is used in any of the examples.

塗装結果は、いずれの場合も塗膜厚みが均一で外観良好であった。   As a result of coating, in all cases, the coating thickness was uniform and the appearance was good.

カーテン塗装装置で塗装を行う状況を示す斜視図である。It is a perspective view which shows the condition which paints with a curtain coating apparatus. 本発明の塗装装置を示す概念図である。It is a conceptual diagram which shows the coating apparatus of this invention. 参考例の塗装装置を示す概念図である。It is a conceptual diagram which shows the coating apparatus of a reference example . 従来の塗装装置を示す概念図である。It is a conceptual diagram which shows the conventional coating apparatus.

符号の説明Explanation of symbols

１ カーテン塗装装置
２ スリット
３ スライド
４ 案内装置
５ エッジガイド
６ カーテン
７ 連続金属帯
８ 板走行方向
１１ ロール
１２ 予備乾燥装置
１３ 加熱炉
１４ スライドビード塗装装置
１５ ロールコータ
１６ 下地塗装装置
１７ 乾燥装置 DESCRIPTION OF SYMBOLS 1 Curtain coating apparatus 2 Slit 3 Slide 4 Guide apparatus 5 Edge guide 6 Curtain 7 Continuous metal strip 8 Plate traveling direction 11 Roll 12 Pre-drying apparatus 13 Heating furnace 14 Slide bead coating apparatus 15 Roll coater 16 Ground coating apparatus 17 Drying apparatus

Claims (4)

連続鋼帯の両面を塗装する塗装装置であって、
水平に移動する鋼帯の一方の面であり塗装する際には上を向いておりその下方に鋼帯を支えるロールが存在しない位置の面を塗装する自由落下のカーテンを有する第１のカーテン塗装装置と、
塗装面を予備乾燥する予備乾燥装置と、
水平に移動する鋼帯の他方の面であり塗装する際には上を向いておりその下方に鋼帯を支えるロールが存在しない位置の面を塗装する自由落下のカーテンを有する第２のカーテン塗装装置と、
上を向いている面と他方の面を同時に加熱焼き付けする加熱装置とを、
この順番で鋼帯が通過するように配置してなり、
第１のカーテン塗装装置と第２のカーテン塗装装置との間で鋼帯の上面となる面を反転させるためのロールを有し、
前記予備乾燥装置は、当該ロールを加熱ロールとして鋼帯と接触させる予備乾燥装置であることを特徴とする鋼帯の塗装装置。 A coating device that coats both sides of a continuous steel strip,
The first curtain coating having a free-falling curtain that coats one surface of a horizontally moving steel strip that faces upward when painting and has no roll supporting the steel strip below it Equipment,
A predrying device for predrying the painted surface;
A second curtain coating having a free-falling curtain that coats the other surface of the horizontally moving steel strip that faces upward when painting and has no roll supporting the strip below it Equipment,
A heating device for heating and baking the surface facing upward and the other surface simultaneously,
It is arranged so that the steel strips pass in this order,
A roll for reversing the surface to be the upper surface of the steel strip between the first curtain coating device and the second curtain coating device;
The pre-drying device is a pre- drying device for bringing the roll into contact with the steel strip as a heating roll . 前記連続鋼帯が端部のメッキ目付量が幅中央部より多い溶融メッキ鋼帯であることを特徴とする請求項１に記載の鋼帯の塗装装置。 The steel strip coating apparatus according to claim 1, wherein the continuous steel strip is a hot dip plated steel strip having a plating basis weight at an end portion larger than that of a central portion of the width . 前記第１のカーテン塗装装置と第２のカーテン塗装装置の一方又は両方で、多層膜の同時塗装を行うことを特徴とする請求項１又は２に記載の鋼帯の塗装装置。 The steel strip coating apparatus according to claim 1 or 2, wherein one or both of the first curtain coating apparatus and the second curtain coating apparatus perform simultaneous coating of a multilayer film. 前記第１のカーテン塗装装置の上流側に、鋼帯表面に下地塗装を行う下地塗装装置と、その後に鋼帯を乾燥する乾燥装置とを有することを特徴とする請求項１乃至３のいずれかに記載の鋼帯の塗装装置。 Upstream of the first curtain coating apparatus, an underlying coating apparatus for performing background painted steel strip surface, any one of claims 1 to 3, characterized in that it has subsequently a drying device for drying the steel strip Steel strip coating equipment as described in 1.
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