JP2006263668A - Method for corona-charged electrostatic powder coating - Google Patents

Method for corona-charged electrostatic powder coating Download PDF

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JP2006263668A
JP2006263668A JP2005089192A JP2005089192A JP2006263668A JP 2006263668 A JP2006263668 A JP 2006263668A JP 2005089192 A JP2005089192 A JP 2005089192A JP 2005089192 A JP2005089192 A JP 2005089192A JP 2006263668 A JP2006263668 A JP 2006263668A
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coating
coated
powder coating
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corona
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JP4870373B2 (en
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Haruhisa Umizumi
晴久 海住
Shinya Okumura
真也 奥村
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Asahi Sunac Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To solve problems such as thick film at the edge of a coating object, orange peel and other coating defects caused by electrostatic repulsion. <P>SOLUTION: Power to a high-voltage generator of a coating gun 1 is interrupted with keeping powder coating being discharged from the coating gun 1 when the coating gun 1 is positioned off the edge of the coating object A to be coated, for example, while the coating gun 1 is going back from the upper or lower edge of the coating object A to be coated to the coating object A to be coated, in the case of powder coating by the coating gun 1 moving up and down, and while the coating gun 1 is positioned between one coating object A to be coated and another coating object A to be coated, in the case of powder coating of coating objects A to be coated moving in a line with a specified space. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、コロナ帯電式静電粉体塗装方法に関するものである。   The present invention relates to a corona charging type electrostatic powder coating method.

コロナ帯電式静電粉体塗装方法は、高電圧発生器を内蔵したコロナ帯電式静電粉体塗装ガン（以下、「塗装ガン」と略す）を使用し、高電圧発生器によってガン先にコロナ放電をさせ、このコロナ放電により塗装ガンと被塗物の間の空気をイオン化させることによってできた電場で、粉体塗料を帯電させて被塗物に付着させる塗装方法である。   The corona charging electrostatic powder coating method uses a corona charging electrostatic powder coating gun (hereinafter abbreviated as “painting gun”) with a built-in high voltage generator. This is a coating method in which a powder coating is charged and adhered to an object by an electric field generated by discharging and ionizing air between the coating gun and the object by this corona discharge.

コロナ放電によって発生したイオンのうち、粉体塗料の帯電に使用されるのはほんの一部であり、大部分のイオンは、フリーイオンとして、塗装ガンと被塗物周辺に存在する。
このフリーイオンが、コロナ帯電式静電粉体塗装方法において塗装不良の要因となる「静電反発」や「ファラデーケージ現象」を起こすといわれている。
「静電反発」とは、被塗物表面に、帯電した粉体塗料が付着すると、粉体塗料層内部の電場が上がり、さらに粉体塗料を塗布し続けると、電場の強さが最終的には粉体塗料層内に閉じ込められた空気をイオン化するまでになり、このイオン化で発生した陽のイオンが、陰極すなわち周辺のフリーイオン集団、もしくは帯電粒子に向かって粉体塗料層から出て行く際に、小さなスパークが起こる現象をいう。このスパークによって発生する小さなくぼみは、オレンジピールとよばれ、塗装表面の品質を大幅に低下させる。 Only a small part of the ions generated by corona discharge are used for charging the powder coating material, and most of the ions are present as free ions around the coating gun and the object to be coated.
It is said that these free ions cause "electrostatic repulsion" and "Faraday cage phenomenon" that cause coating failure in the corona charging type electrostatic powder coating method.
“Electrostatic repulsion” means that when a charged powder coating adheres to the surface of an object to be coated, the electric field inside the powder coating layer rises. In other words, the air trapped in the powder coating layer is ionized, and the positive ions generated by this ionization exit the powder coating layer toward the cathode, that is, the surrounding free ion population or charged particles. A phenomenon in which a small spark occurs when going. The small indentation produced by this spark is called orange peel and greatly reduces the quality of the painted surface.

次に、「ファラデーケージ現象」は、発生した電場による電気力線が被塗物のエッジ部分に集中し、くぼんだ部分や溝の内面への塗装ができない現象をいう。
このくぼんだ部分や溝の内面への塗装ができないという現象は、単に電気力線が溝の入口エッジ部分に集中するためだけではなく、その結果としてエッジ部分への塗料の付着が早く、この部分で静電反発が始まると、後続の帯電塗料が次々と中和されて、溝の内部にほとんど付着しなくなるということが起こっていると考えられている。 Next, the “Faraday cage phenomenon” refers to a phenomenon in which the lines of electric force generated by the electric field concentrate on the edge portion of the object to be coated, and the inner surface of the recessed portion or groove cannot be coated.
The phenomenon that the inner surface of the groove or the groove cannot be coated is not only due to the fact that the lines of electric force concentrate on the entrance edge of the groove, but as a result, the paint adheres quickly to the edge. When electrostatic repulsion starts, it is thought that subsequent charged paints are neutralized one after another and hardly adhere to the inside of the groove.

ところで、コロナ帯電式静電粉体塗装方法においては、フリーイオンは、被塗物の平面部分にも到達するが、そのほとんどが上記の通り、被塗物の端面部（エッジ部）に集中することになる。   By the way, in the corona charging type electrostatic powder coating method, free ions reach the planar portion of the object to be coated, but most of them are concentrated on the end surface portion (edge portion) of the object to be coated as described above. It will be.

したがって、レシプロケーター等の自動昇降装置によって塗装ガンを、被塗物に対して均一なスピードで移動させながら塗装を行っても、被塗物の上下の端面部において、塗膜が厚くなったり、ユズ肌や静電反発による塗装不良が起こったりするという問題があった。   Therefore, even if coating is performed while moving the coating gun with an automatic lifting device such as a reciprocator at a uniform speed, the coating film becomes thick at the upper and lower end surfaces of the workpiece, There has been a problem that paint defects may occur due to yuzu skin and electrostatic repulsion.

そこで、この発明は、コロナ帯電式静電粉体塗装方法において、被塗物の端面部の塗膜が厚くなったり、ユズ肌や静電反発による塗装不良が起こったりするという問題を解決し、被塗物全面に均一で平滑な被膜を形成しようとするものである。   Therefore, the present invention solves the problem that, in the corona charging electrostatic powder coating method, the coating film on the end face of the object to be coated becomes thick, or the coating failure occurs due to the skin of the skin or electrostatic repulsion. It is intended to form a uniform and smooth film on the entire surface of the object.

この発明は、塗装ガンと被塗物とを相対的に移動させながら粉体塗料の吐出を行うコロナ帯電式静電粉体塗装方法において、塗装ガンが被塗物の端面部付近から被塗物を超えた位置にある時、例えば、塗装ガンを上下動させて被塗物に粉体塗料を塗布する場合は、被塗物の上下端部から折り返して被塗物に戻るまでの間、あるいは被塗物が所定間隔で並んで移動する場合は、被塗物と被塗物との間で、塗装ガンからの粉体塗料の吐出を維持した状態のまま、塗装ガンの高電圧発生器への通電を遮断するようにしたのである。
この発明において、塗装ガンの高電圧発生器への通電を遮断するとの概念は、塗装ガンの高電圧発生器の電圧を零にする以外に、粉体塗料が帯電しない電圧まで下げる意味で使用する。 The present invention relates to a corona charging electrostatic powder coating method in which a powder coating is discharged while relatively moving a coating gun and an object to be coated. For example, when applying a powder paint to an object to be coated by moving the paint gun up and down, it will return from the upper and lower ends of the object to return to the object or When the object to be coated moves side by side at a predetermined interval, to the high voltage generator of the paint gun while maintaining the discharge of the powder paint from the paint gun between the object to be coated. The power was cut off.
In the present invention, the concept of interrupting the energization of the high voltage generator of the coating gun is used in the sense of reducing the voltage of the high voltage generator of the coating gun to a voltage at which the powder paint is not charged. .

上記のように、塗装ガンが、被塗物の端面部を通過して被塗物まで戻ってくる間や、被塗物と被塗物との間において、塗装ガンの高電圧発生器への通電を遮断すると、被塗物の端面部への電気力線の集中が軽減でき、被塗物の端面部の塗膜が厚くなり難い。   As described above, while the coating gun passes through the end face of the object to be returned to the object to be coated, or between the objects to be coated, the paint gun is connected to the high voltage generator. When the energization is cut off, the concentration of the electric lines of force on the end surface portion of the object to be coated can be reduced, and the coating film on the end surface portion of the object to be coated is unlikely to be thick.

そして、被塗物の端面部において静電反発が生じた場合には、高電圧発生器への通電が遮断された塗装ガンが被塗物の端面部付近を移動する際に、帯電していない粉体塗料が被塗物の端面部付近に吐出されるので、この帯電していない粉体塗料によって被塗物の端面部における静電反発が解消され、均一で平滑な塗膜が得られる。   If electrostatic repulsion occurs at the end face of the object to be coated, the coating gun with the power supply to the high voltage generator cut off is not charged when moving near the end face of the object to be coated. Since the powder coating material is discharged near the end surface portion of the object to be coated, the electrostatic repulsion at the end surface portion of the object to be coated is eliminated by the uncharged powder coating material, and a uniform and smooth coating film is obtained.

このように、この発明は、塗装ガンからの粉体塗料の吐出は維持したまま、電気力線が集中し易い部分を塗装ガンが通過する際に、コロナ帯電式静電粉体塗装ガンの高電圧発生器への通電を遮断することにより、被塗物に対する部分的な電気力線の集中を回避し、被塗物全面に均一で平滑な塗膜の形成をしようとしたものである。   As described above, when the coating gun passes through the portion where the electric lines of force tend to concentrate while maintaining the discharge of the powder coating from the coating gun, the corona charging electrostatic powder coating gun By cutting off the power supply to the voltage generator, it is intended to avoid partial concentration of lines of electric force on the object to be coated, and to form a uniform and smooth coating film on the entire surface of the object.

この発明においては、塗装ガンの高電圧発生器への通電は、ＯＮ−ＯＦＦするが、粉体塗料の吐出は連続させておくことが重要である。
粉体塗料の吐出を連続させずに高電圧発生器への通電と同様に、ＯＮ−ＯＦＦすると、粉体塗料は塗料搬送ホース内で溶剤塗料のように密になっていないので、ＯＮ−ＯＦＦの切換の際に、吐出が安定せず、吐出が安定するまでに時間がかかる。また、粉体塗料の搬送を一旦止めて搬送を再開すると、塗料搬送ホース内で蓄積された粉体塗料が一度に異常吐出したりして、塗装不良を起こす原因になる。 In the present invention, the energization of the high voltage generator of the coating gun is turned on and off, but it is important that the discharge of the powder coating is continued.
As with energizing the high-voltage generator without continuously discharging the powder paint, if it is turned on and off, the powder paint is not as dense as the solvent paint in the paint transfer hose. When switching, the discharge is not stable, and it takes time until the discharge is stabilized. Further, once the conveyance of the powder coating material is stopped and the conveyance is resumed, the powder coating material accumulated in the coating material conveyance hose is abnormally discharged at a time, which causes a coating failure.

また、被塗物に当らない粉体塗料、即ちオーバースプレー粉は、被塗物の端面部付近や被塗物と被塗物との間で多くなる。そして、被塗物をハンギングしたハンガーにも、粉体塗料が付着し、そのまま被塗物と一緒に焼付けられるので、ハンガーにメルト硬化した粉体塗料によってハンガー部の面積が次第に大きくなる。何度もそのハンガーを使用すると粉体塗料が大きく付着し、被塗物との接点（アース）が不良になり、付き回り、安全性及び粉体塗料の無駄が発生するという問題が生じる。この発明では、被塗物の端面部付近で塗装ガンの高電圧発生器への通電をＯＦＦにしているので、ハンガーやブース内面にオーバースプレー粉が当っても付着しにくく、帯電していない粉体塗料は付着してもエアーブローによって簡単に除去することができる。したがって、この発明では、上記ハンガーへの粉体塗料の付着による問題が生じにくく、色替え時におけるブース内面の清掃も行いやすい。   In addition, the amount of powder paint that does not hit the object to be coated, that is, overspray powder, increases in the vicinity of the end surface of the object to be coated and between the object to be coated and the object to be coated. Then, the powder paint adheres to the hanger that hangs the object to be coated and is baked together with the object to be coated, so that the area of the hanger portion gradually increases due to the powder paint melt-cured on the hanger. If the hanger is used many times, the powder paint will adhere greatly, the contact point (ground) with the object to be coated will be poor, and there will be a problem that it will be attached, safety and waste of the powder paint will occur. In this invention, since the energization to the high voltage generator of the coating gun is turned off in the vicinity of the end face of the object to be coated, even if the overspray powder hits the hanger or booth inner surface, Even if the body paint adheres, it can be easily removed by air blow. Therefore, in this invention, the problem by adhesion of the powder coating material to the said hanger does not arise easily, and it is easy to clean the booth inner surface at the time of color change.

この発明のコロナ帯電式静電粉体塗装方法によると、被塗物の端面部の塗膜が厚くなったり、ユズ肌や静電反発による塗装不良が起こったりするという問題が解決され、均一な膜厚で、平滑な塗膜を形成することができる。   According to the corona charging electrostatic powder coating method of the present invention, the problem that the coating film on the end face of the object to be coated becomes thick, or the coating failure due to the crushed skin or electrostatic repulsion occurs, is solved. A smooth coating film can be formed with a film thickness.

図１は、冷蔵庫の扉を被塗物Ａにした塗装例を示している。
この例では、塗装ガン１を塗装ブース２内に、並列に２ガン、対向位置に２ガンの計４ガンを設置している。被塗物Ａは、図１に示すように内面部を互いに内側にしてハンガー３にハンギングされている。塗装ガン１は、自動昇降装置４（レシプロケーター）に取付けられて上下動し、上下動のストロークは被塗物Ａの上下寸法よりも各上下２００ｍｍの範囲でオーバーラップするようになっている。
この発明のコロナ帯電式静電粉体塗装方法では、塗装ガン１から粉体塗料を連続吐出した状態のまま、昇降する塗装ガン１が、被塗物Ａの塗装面に位置する状態から被塗物Ａの上下限２０ｍｍに達した時点で、塗装ガン１の高電圧発生器への通電をＯＦＦにし、塗装ガン１が被塗物Ａの塗装面を超えて折り返し、被塗物Ａの塗装面に戻って、被塗物Ａの上下限より１０ｍｍ塗装面に入ったところで、再び、塗装ガン１の高電圧発生器への通電をＯＮにするというように、塗装ガン１の高電圧発生器への通電を、ＯＮ−ＯＦＦ制御している。この塗装ガン１の上下動と高電圧発生器への通電のＯＮ−ＯＦＦの関係を図示すると、図３に示すようになる。
この発明の上記実施例による塗装結果と、塗装ガン１の高電圧発生器への通電をＯＮにした状態のまま塗装を行う従来例の塗装結果とを表１に示した。 FIG. 1 shows a painting example in which a refrigerator door is an object to be coated A.
In this example, the painting gun 1 is installed in the painting booth 2 with two guns in parallel and two guns in the opposite position, for a total of four guns. As shown in FIG. 1, the object A is hung on the hanger 3 with the inner surface portions facing each other. The coating gun 1 is attached to an automatic elevating device 4 (reciprocator) and moves up and down, and the vertical movement stroke overlaps the vertical dimension of the workpiece A in the range of 200 mm above and below.
In the corona charging type electrostatic powder coating method of the present invention, the coating gun 1 that moves up and down while the powder coating is continuously discharged from the coating gun 1 is applied from the state where the coating gun 1 is positioned on the coating surface of the article A to be coated. When the upper and lower limits of the object A reach 20 mm, the energization of the high voltage generator of the coating gun 1 is turned off, the coating gun 1 turns over beyond the painted surface of the object A, and the painted surface of the object A is coated. Returning to, when the coating surface of the object A is 10 mm from the upper and lower limits, the energization of the high voltage generator of the painting gun 1 is turned on again, so that the high voltage generator of the painting gun 1 is turned on. Is turned on and off. FIG. 3 shows the relationship between the vertical movement of the coating gun 1 and the ON / OFF of energization to the high voltage generator.
Table 1 shows the result of painting according to the above-described embodiment of the present invention and the result of painting in a conventional example in which painting is performed while the energization of the high voltage generator of the painting gun 1 is turned on.

Figure 2006263668
Figure 2006263668

表１には、図４に示す通り、塗装面を上下６段（Ａ〜Ｆ段）に分割し、各分割面の左右６箇所についての平均膜厚（μｍ）と、表面粗度計（Ｇａｒｄｎｅｒ社「ウェーブスキャン プラス」）の測定値を示している。   In Table 1, as shown in FIG. 4, the painted surface is divided into upper and lower 6 levels (A to F levels). (Wavescan Plus)).

この表１の結果から、従来の塗装方法では、上下端面部の膜厚が他の部分よりも厚く、しかも表面粗度にばらつきが生じるのに対し、この発明の実施例による塗装方法では、膜厚、表面粗度が端面部とその他の部分で均一になるということが確認できた。   From the results of Table 1, in the conventional coating method, the film thickness of the upper and lower end surface portions is thicker than the other portions and the surface roughness varies, but in the coating method according to the embodiment of the present invention, the film It was confirmed that the thickness and surface roughness were uniform at the end face and other portions.

次に、この発明の上記実施例による塗装方法と、従来例による塗装方法について、ハンガー３に付着する粉体塗料の量を比較した結果を表２に示す。試験は、それぞれの塗装方法で塗装を行った後、被塗物Ａと共に焼き付けるという行程を１０回繰り返し、その後に、ハンガー３に付着した膜厚を測定した。その結果は表２の通りであり、この発明の上記実施例による塗装方法は、従来例による塗装方法よりもハンガーに付着する粉体塗料の量が格段に少ないということが確認できた。   Next, Table 2 shows the result of comparing the amount of the powder coating material adhering to the hanger 3 for the coating method according to the above embodiment of the present invention and the coating method according to the conventional example. In the test, after coating by each coating method, the process of baking together with the article A was repeated 10 times, and then the film thickness attached to the hanger 3 was measured. The results are shown in Table 2. It was confirmed that the amount of the powder coating material adhering to the hanger was much smaller in the coating method according to the above embodiment of the present invention than in the conventional coating method.

Figure 2006263668
Figure 2006263668

また、この発明の上記実施例による塗装方法と、従来例による塗装方法について、ハンガー３に付着する粉体塗料を、焼き付ける前にエアーブローしたところ、この発明の上記実施例による塗装方法の場合、ハンガー３に付着した粉体塗料は容易に取り除くことができた。   In addition, regarding the coating method according to the above embodiment of the present invention and the coating method according to the conventional example, when the powder paint adhering to the hanger 3 is air blown before baking, in the case of the coating method according to the above embodiment of the present invention, The powder paint adhering to the hanger 3 could be easily removed.

さらに、この発明の上記実施例による塗装方法と従来例による塗装方法とでは、塗装ガン１の対面部に位置するブース２の側面に付着したオーバースプレー粉に関しても、この発明の上記実施例による塗装方法の場合は、従来例による塗装方法よりも付着量が少なく、しかもエアーブローによる清掃も容易であった。   Further, in the coating method according to the above-described embodiment of the present invention and the coating method according to the conventional example, the overspray powder adhered to the side surface of the booth 2 located at the facing portion of the coating gun 1 is also applied according to the above-described embodiment of the present invention. In the case of the method, the amount of adhesion was smaller than in the conventional coating method, and cleaning by air blow was easy.

図５は、被塗物Ａが切り板鋼板であり、この被塗物Ａを水平に搬送しながら、上面に設置した塗装ガン１によって水平塗装を行う塗装装置の概略図である。図５において、符号５は、多孔質材料からなる塗装ブース、６は水切り乾燥炉、７は焼付け炉、８は吸気ダクト、９はレシプロケーター、１０はシロッコファン、１１は搬送コンベアをそれぞれ示している。   FIG. 5 is a schematic view of a coating apparatus in which the object A is a cut sheet steel plate and performs horizontal coating with the coating gun 1 installed on the upper surface while the object A is conveyed horizontally. In FIG. 5, reference numeral 5 is a coating booth made of a porous material, 6 is a draining and drying furnace, 7 is a baking furnace, 8 is an intake duct, 9 is a reciprocator, 10 is a sirocco fan, and 11 is a conveyor. Yes.

この水平塗装装置を使用して、この発明の塗装方法を実施した場合と実施しない場合とについて実験を行った。
被塗物Ａとして、切り板「幅１５２４ｍｍ×長さ３０４８ｍｍ」を使用した。被塗物Ａと被塗物Ａとの間隔は、２００ｍｍで塗装を行った。この発明の実施例は、被塗物Ａ間において、粉体塗料を吐出したままで、塗装ガン１の高電圧発生器への通電のみをＯＦＦにして塗装を行うという方法である。従来例は、被塗物Ａ間において、粉体塗装ガン１の高電圧発生器への通電をＯＦＦにすると共に、粉体塗料の吐出もストップして塗装を行う方法とした。 Using this horizontal coating apparatus, an experiment was conducted with and without performing the coating method of the present invention.
A cut plate “width 1524 mm × length 3048 mm” was used as the object A to be coated. Coating was performed with an interval between the object A and the object A being 200 mm. The embodiment of the present invention is a method in which the coating is performed while only the energization to the high voltage generator of the coating gun 1 is turned off while the powder coating is being discharged between the objects A to be coated. In the conventional example, between the objects to be coated A, the energization to the high voltage generator of the powder coating gun 1 is turned off and the discharge of the powder paint is stopped to perform the coating.

この従来例では、被塗物Ａ間で、粉体塗料の吐出をＯＮ−ＯＦＦするため、吐出量が安定するのに数秒かかり、被塗物Ａである切り板の前後部において、膜厚に大きな差ができると共に、肌荒れを起こし、例えば、塗装後に写真フィルムの転写を行うと、膜厚に均一性がなく、転写した写真フィルムに微妙な凹凸が生じ、転写後の色違いや、違和感が発生するという問題があった。つまり、転写では、下地を拾うために、できあがり製品に色むらが発生し不良となる。   In this conventional example, since the discharge of the powder coating material is turned on and off between the objects to be coated A, it takes several seconds for the discharge amount to be stabilized. In addition to making a large difference and causing rough skin, for example, when a photographic film is transferred after painting, the film thickness is not uniform, and the transferred photographic film has subtle irregularities, resulting in a color difference after transfer and a sense of discomfort. There was a problem that occurred. That is, in the transfer, since the substrate is picked up, color unevenness occurs in the finished product, resulting in a defect.

これに対し、被塗物Ａ間でも、粉体塗料の吐出は連続させたまま、塗装ガン１の高電圧発生器への通電のみをＯＦＦにして塗装を行うこの発明の場合は、被塗物Ａである切り板の前後部の膜厚も均一で、表面も平滑であるため、塗装後に写真フィルムの転写を行っても問題が生じなかった。   On the other hand, in the case of the present invention in which coating is performed with only the energization to the high-voltage generator of the coating gun 1 being turned off while the discharge of the powder coating is continued even between the objects A to be coated, Since the thickness of the front and rear portions of the cut plate A was uniform and the surface was smooth, no problem occurred even when the photographic film was transferred after coating.

また、この発明の場合、被塗物Ａ間で粉体塗料の吐出を連続させていても、被塗物Ａ間では塗装ガン１の高電圧発生器への通電がＯＦＦの状態であるから、切り板の搬送用コンベア１１に付着するオーバースプレー粉は、電荷がないために容易に取り除いて回収することができ、搬送用コンベア１１上の残粉がなく、切り板裏面に付着しない。   In the case of this invention, even if the discharge of the powder coating material is continued between the objects A to be coated, the energization to the high voltage generator of the coating gun 1 is OFF between the objects A to be coated. Since there is no electric charge, the overspray powder adhering to the cutting plate conveying conveyor 11 can be easily removed and collected, and there is no residual powder on the conveying conveyor 11 and does not adhere to the back surface of the cutting plate.

図６は、鋼製家具の側面パネルを被塗物Ａにして、メタリック粉体塗装を行う塗装例を示している。
この例では、メタリック粉体塗料として、クリヤーの粉体塗料にアルミ顔料（鱗片）を混ぜたドライブレンド方式のものを使用した。 FIG. 6 shows a coating example in which metallic powder coating is performed with the side panel of the steel furniture as the article A to be coated.
In this example, as the metallic powder coating material, a dry blend type material in which an aluminum pigment (scale piece) is mixed with a clear powder coating material was used.

この例では、塗装ガン１を塗装ブース２内に、並列に２ガン、対向位置に２ガンの計４ガンを設置している。被塗物Ａは、図６に示すように内面部を互いに内側にしてハンガー３にハンギングされている。   In this example, the painting gun 1 is installed in the painting booth 2 with two guns in parallel and two guns in the opposite position, for a total of four guns. As shown in FIG. 6, the article A is hung on the hanger 3 with the inner surface portions facing each other.

塗装ガン１は、自動昇降装置４（レシプロケーター）に取付けられて上下動し、上下動のストロークは被塗物Ａの上下寸法よりも各上下１００ｍｍの範囲でオーバーラップして、オーバースプレー塗装を行うようにしている。その理由は、被塗物Ａの上下限がコの字型に曲がっているために、その部分の塗装を行うためである。   The coating gun 1 is mounted on an automatic lifting device 4 (reciprocator) and moves up and down, and the vertical movement stroke overlaps within the range of 100 mm above and below the vertical dimension of the article A to be coated. Like to do. The reason is that the upper and lower limits of the article A to be coated are bent in a U-shape, so that the portion is painted.

表３に示すように、塗装ガン１の上下のストローク中、塗装ガン１の高電圧発生器への通電をＯＮ状態で連続塗装を行う従来例の場合には、上下端面付近は平面部に比較して黒ずんだ塗膜となった。これは端面部に、静電気が集中するために、メタリック粉体塗料（ドライブレンド）のアルミ顔料が多く集まって黒ずんだ模様を形成するためと考えられる。   As shown in Table 3, in the case of the conventional example in which energization to the high voltage generator of the painting gun 1 is continuously turned on during the upper and lower strokes of the painting gun 1, the vicinity of the upper and lower end surfaces is compared with the flat part. And it became a blackened paint film. This is presumably because a large amount of aluminum pigment in the metallic powder coating (dry blend) gathers to form a dark pattern because static electricity concentrates on the end face.

一方、この発明では、連続吐出中に被塗物Ａの上端部より高電圧発生器への通電をＯＦＦし、塗装ガン１が上端面部に近づくと、高電圧発生器への通電をＯＮにし、塗装ガン１が被塗物下端部の手前３０ｍｍで、高電圧発生器への通電をＯＦＦにして塗装を行った。これにより、電荷のない粉体塗料が静電気によって黒ずんだ個所が粉体塗料で洗い流され、均一なメタリック塗膜を形成することができた。
表３は、図４に示す場合と同様に、塗装面を上下１０段（Ａ〜Ｊ段）に分割し、各分割面の左右６箇所についての平均膜厚（μｍ）を測定した。また、メタリックの目視評価は、表面に黒ずんだ個所がある場合を×、表面に黒ずんだ個所がない場合を◎として評価した。 On the other hand, in the present invention, during continuous discharge, the energization to the high voltage generator is turned off from the upper end portion of the article A to be coated, and when the coating gun 1 approaches the upper end surface portion, the energization to the high voltage generator is turned on, The coating gun 1 was 30 mm before the lower end of the object to be coated, and coating was performed with the energization of the high voltage generator turned off. As a result, the portion where the powder coating without charge was darkened by static electricity was washed away with the powder coating, and a uniform metallic coating film could be formed.
In Table 3, as in the case shown in FIG. 4, the painted surface was divided into upper and lower 10 steps (A to J steps), and the average film thickness (μm) was measured at six locations on the left and right of each divided surface. Further, the visual evaluation of metallic was evaluated as x when there was a darkened portion on the surface and ◎ when there was no darkened portion on the surface.

Figure 2006263668
Figure 2006263668

図７は、ハンガー３に所定間隔で複数の被塗物Ａを１段吊りにして塗装を行う場合に、この発明を適用する場合の塗装ガン１の位置と、高電圧発生器への通電のＯＮ−ＯＦＦ関係を図示したものである。即ち、この例では、塗装ガン１のストロークの内、上下端と、被塗物Ａ間において、高電圧発生器への通電をＯＦＦにしている。   FIG. 7 shows the position of the coating gun 1 and the application of current to the high voltage generator when the present invention is applied when a plurality of articles A are hung on the hanger 3 at predetermined intervals. The ON-OFF relationship is illustrated. That is, in this example, the energization to the high voltage generator is turned off between the upper and lower ends of the stroke of the coating gun 1 and the workpiece A.

この発明の第１の実施例の正面図である。1 is a front view of a first embodiment of the present invention. 同上の平面図である。It is a top view same as the above. 第１の実施例の塗装ガン１のストロークと、高電圧発生器への通電のＯＮ−ＯＦＦ関係を示す説明図である。It is explanatory drawing which shows the stroke of the coating gun 1 of a 1st Example, and the ON-OFF relationship of electricity supply to a high voltage generator. この発明の第１の実施例において被塗物の表面検査位置を示す図である。It is a figure which shows the surface inspection position of a to-be-coated object in 1st Example of this invention. この発明の第２の実施例の正面図である。It is a front view of 2nd Example of this invention. この発明の第３の実施例の正面図である。It is a front view of the 3rd example of this invention. この発明の第４の実施例の塗装ガン１のストロークと、高電圧発生器への通電のＯＮ−ＯＦＦ関係を示す説明図である。It is explanatory drawing which shows the stroke of the coating gun 1 of 4th Example of this invention, and the ON-OFF relationship of electricity supply to a high voltage generator.

符号の説明Explanation of symbols

Ａ 被塗物
２ ブース
３ ハンガー
４ レシプロケーター
５ ブース
６ 水切り乾燥炉
７ 焼付け炉
８ 吸気ダクト
９ レシプロケーター
１０ シロッコファン
１１ 搬送コンベア A Object 2 Booth 3 Hanger 4 Reciprocator 5 Booth 6 Draining and drying furnace 7 Baking furnace 8 Intake duct 9 Reciprocator 10 Sirocco fan 11 Conveyor

Claims (4)

コロナ帯電式静電粉体塗装ガンと被塗物とを相対的に移動させながら粉体塗料の吐出を行うコロナ帯電式静電粉体塗装方法において、コロナ帯電式静電粉体塗装ガンが被塗物の端面部付近から被塗物を超えた位置にある時に、コロナ帯電式静電粉体塗装ガンからの粉体塗料の吐出を維持した状態のまま、コロナ帯電式静電粉体塗装ガンの高電圧発生器への通電を遮断することを特徴とするコロナ帯電式静電粉体塗装方法。   In a corona charging electrostatic powder coating method in which powder coating material is discharged while relatively moving a corona charging electrostatic powder coating gun and an object to be coated, the corona charging electrostatic powder coating gun is covered. A corona-charged electrostatic powder coating gun while maintaining the discharge of powder paint from the corona-charged electrostatic powder coating gun when it is in the position beyond the object to be coated from near the end face of the coating A corona charging type electrostatic powder coating method characterized by cutting off the power supply to the high voltage generator. 搬送装置によって移動する被塗物に対して、コロナ帯電式静電粉体塗装ガンが被塗物の移動方向と直交する方向に往復移動することを特徴とする請求項１記載のコロナ帯電式静電粉体塗装方法。   2. The corona-charged electrostatic static gun according to claim 1, wherein a corona-charged electrostatic powder coating gun reciprocates in a direction perpendicular to the direction of movement of the object to be coated which is moved by the conveying device. Electropowder coating method. 搬送装置によって被塗物を所定間隔で移動させ、被塗物と被塗物との間で、コロナ帯電式静電粉体塗装ガンからの粉体塗料の吐出を維持した状態のまま、コロナ帯電式静電粉体塗装ガンの高電圧発生器への通電を遮断することを特徴とする請求項１記載のコロナ帯電式静電粉体塗装方法。   The object to be coated is moved at a predetermined interval by the transport device, and the corona charging is performed while maintaining the discharge of the powder coating from the corona charging electrostatic powder coating gun between the objects to be coated. 2. The corona charging type electrostatic powder coating method according to claim 1, wherein the energization to the high voltage generator of the electrostatic powder coating gun is cut off. 被塗物を所定間隔で吊るし、コロナ帯電式静電粉体塗装ガンを上下に移動させながら粉体塗料の吐出を行う場合に、被塗物と被塗物との間で、コロナ帯電式静電粉体塗装ガンからの粉体塗料の吐出を維持した状態のまま、コロナ帯電式静電粉体塗装ガンの高電圧発生器への通電を遮断することを特徴とする請求項１記載のコロナ帯電式静電粉体塗装方法。
When discharging the powder paint while hanging the object to be coated at predetermined intervals and moving the corona-charged electrostatic powder coating gun up and down, the corona-charged static electricity between the object and the object to be coated 2. The corona according to claim 1, wherein energization of the high voltage generator of the corona charging type electrostatic powder coating gun is cut off while the discharge of the powder coating from the electropowder coating gun is maintained. Charged electrostatic powder coating method.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103657972A (en) * 2013-12-06 2014-03-26 中山市君禾机电设备有限公司 Spraying system used for box combined type spraying
KR20180130922A (en) * 2017-05-30 2018-12-10 (주)밴엔지니어링 Coating method and coating equipment of grate for gas appliances

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60137470A (en) * 1983-12-22 1985-07-22 Kawasaki Steel Corp Method for controlling coated film thickness in electrostatic powder coating
JPH11165100A (en) * 1997-12-01 1999-06-22 Matsuo Sangyo Kk Powder coater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60137470A (en) * 1983-12-22 1985-07-22 Kawasaki Steel Corp Method for controlling coated film thickness in electrostatic powder coating
JPH11165100A (en) * 1997-12-01 1999-06-22 Matsuo Sangyo Kk Powder coater

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103657972A (en) * 2013-12-06 2014-03-26 中山市君禾机电设备有限公司 Spraying system used for box combined type spraying
KR20180130922A (en) * 2017-05-30 2018-12-10 (주)밴엔지니어링 Coating method and coating equipment of grate for gas appliances
KR101986740B1 (en) 2017-05-30 2019-06-10 (주)밴엔지니어링 Coating method and coating equipment of grate for gas appliances

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