JP5352799B2 - Corona charging device - Google Patents

Corona charging device Download PDF

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JP5352799B2
JP5352799B2 JP2008095273A JP2008095273A JP5352799B2 JP 5352799 B2 JP5352799 B2 JP 5352799B2 JP 2008095273 A JP2008095273 A JP 2008095273A JP 2008095273 A JP2008095273 A JP 2008095273A JP 5352799 B2 JP5352799 B2 JP 5352799B2
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electrode
resin tube
powder coating
conductive resin
coating
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JP2009247930A (en
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晴久 海住
斉 吉田
真也 奥村
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Asahi Sunac Corp
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Asahi Sunac Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a corona electrification-type coating device which is almost free from the deposition of powder coating material on a corona electrode 4 and can optimize the position setting of the corona electrode 4. <P>SOLUTION: This corona electrification-type coating device features the covering of the corona electrode 4 exposed at the gun tip 2 of a spray gun for discharging the powder coating material by a flexible non-conducting resin tube 5. Thus it is possible to inhibit the deposition of the powder coating material on the corona electrode 4 and adjust the position of the corona electrode 4 in compliance with coating speed, the distance to an article to be coated, habit of the operator, etc. by flexing the non-conducting resin tube 5. Consequently, an optimal electric field for coating conditions can be formed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

この発明は、高電圧をコロナ電極に印加し、コロナ放電により発生したイオンを粉体塗料に付着させ、被塗物に電気的に粉体塗料を塗着させるコロナ帯電式塗装装置に関するものである。   The present invention relates to a corona charging type coating apparatus that applies a high voltage to a corona electrode, attaches ions generated by corona discharge to the powder coating material, and electrically coats the coating material with the powder coating material. .

粉体塗装は、被塗物に対して帯電した粉体塗料を吹き付け、被塗物に電気的に粉体塗料を付着させる塗装方法であり、被塗物に付着しなかった粉体塗料を、回収して再利用することができる環境に優しい塗装方法である。   Powder coating is a coating method in which a charged powder coating is sprayed on the object to be coated, and the powder coating is electrically attached to the object to be coated. It is an environmentally friendly painting method that can be recovered and reused.

ところで、粉体塗装では、塗膜の平滑性をより良好にするために、粉体塗料の微粒化が進んでいる。   By the way, in powder coating, in order to make the smoothness of a coating film better, atomization of the powder coating is progressing.

また、アルミ顔料を含むメタリック粉体塗料を使用したメタリック塗装も近年その需要が増している。   In recent years, the demand for metallic coatings using metallic powder coatings containing aluminum pigments has also increased.

図7及び図8は、粉体塗料を噴出する筒状のガン先2に、扇形の吐出パターンを形成するフラット式のノズル3を装着した従来の一般的な静電粉体塗装ガン1を示しており、筒状のガン先2には、高電圧発生器に接続された電極4が、フラット式のノズル3の内側の中央部に突出した状態で設置されている。   7 and 8 show a conventional general electrostatic powder coating gun 1 in which a flat type nozzle 3 for forming a fan-shaped discharge pattern is mounted on a cylindrical gun tip 2 from which powder paint is ejected. In addition, an electrode 4 connected to a high voltage generator is installed on the cylindrical gun tip 2 in a state where it protrudes from the central part inside the flat nozzle 3.

このような構造の静電粉体塗装ガン1を使用して、微粒化した粉体塗料やアルミ顔料を含むメタリック粉体塗料を噴霧した場合、特に、コロナ放電を行う電極4の先端部分に、図7の符号Dで示すように、粉体塗料が固まったように付着しやすい。   When the electrostatic powder coating gun 1 having such a structure is used and atomized powder coating or metallic powder coating containing an aluminum pigment is sprayed, in particular, at the tip of the electrode 4 that performs corona discharge, As shown by the symbol D in FIG. 7, the powder coating is likely to adhere as if it is hardened.

電極4の先端に付着する粉体塗料の量が多くなると、塗装中に電極4に付着した粉体塗料が剥がれ、この剥がれた粉体塗料の塊が、ブツとなって被塗物に付着し、塗膜不良を起こすという問題が生じる。   When the amount of the powder coating material adhering to the tip of the electrode 4 is increased, the powder coating material adhering to the electrode 4 is peeled off during coating, and the lump of the powder coating material peeled off adheres to the object to be coated. The problem of causing poor coating occurs.

特に、メタリック粉体塗料に含まれるアルミ顔料は、電極4に付着し易く、粉体塗料を吐出するスプレーガンのガン先を、アルミ顔料が覆い尽くすほど増殖することも珍しくない。そして、アルミ顔料は導電性であるから、電極4の先端で増殖したアルミ顔料により、コロナリークが大きくなり、塗着効率を低下させるという問題があった。また、コロナリークが大きくなると、粉体塗装の安全性の面でも問題となる。   In particular, the aluminum pigment contained in the metallic powder coating tends to adhere to the electrode 4, and it is not uncommon for the aluminum pigment to cover the gun tip of the spray gun that discharges the powder coating so that the aluminum pigment covers it. Since the aluminum pigment is conductive, the aluminum pigment grown at the tip of the electrode 4 has a problem that corona leak increases and the coating efficiency is lowered. Further, when the corona leak increases, there is a problem in the safety of powder coating.

次に、コロナ帯電式塗装装置においては、コロナ電極の位置設定は、粉体塗料に最適な電荷を与え、塗着効率を向上させるために、極めて重要である。   Next, in the corona charging type coating apparatus, the position setting of the corona electrode is extremely important in order to give an optimum charge to the powder coating material and improve the coating efficiency.

このため、ガン先形状や、粉体塗料の種類、被塗物の形状、被塗物までの距離、或いは手吹きガンの場合には、作業者の癖等によって、コロナ電極の位置設定を最適化する必要がある。   For this reason, the position of the corona electrode is optimally set depending on the shape of the gun tip, the type of powder coating, the shape of the object to be coated, the distance to the object to be coated, or, in the case of hand-blown guns, the operator's heel It is necessary to make it.

しかしながら、現実には、コロナ電極の位置選定を調整できるようにしたものがなかった。   However, in reality, there has been nothing that can adjust the position selection of the corona electrode.

そこで、この発明は、コロナ電極への粉体塗料の付着が少なく、しかもコロナ電極の位置設定を最適化することができるコロナ帯電式塗装装置を提供しようとするものである。   In view of the above, the present invention is intended to provide a corona charging type coating apparatus in which the powder coating is less likely to adhere to the corona electrode and the position setting of the corona electrode can be optimized.

上記の課題を解決するために、この発明は、粉体塗料を吐出するスプレーガンのガン先に露出する電極、あるいは、粉体塗料が噴霧されたブース内に露出する電極を屈曲可能な非導電性樹脂チューブによって覆うことにより、電極への粉体塗料の付着を防止し、非導電性樹脂チューブを屈曲させることにより、塗装速度、被塗物との距離、作業者の癖などに応じて電極の位置を調整し、塗装条件に最適な電場を形成することを可能としたものである。   In order to solve the above-mentioned problems, the present invention is a non-conductive material capable of bending an electrode exposed at the tip of a spray gun that discharges powder paint or an electrode exposed in a booth sprayed with powder paint. By covering with a conductive resin tube, it prevents powder paint from adhering to the electrode, and by bending the non-conductive resin tube, the electrode can be used according to the coating speed, distance to the object to be coated, worker's wrinkles, etc. This makes it possible to form an electric field optimal for the coating conditions.

さらに、電極を覆う非導電性樹脂チューブ内へのエアーや不活性ガスの導入により、電極先端への粉体塗料の付着を確実に防止し、粉体塗料と非導電性樹脂チューブとの接触により、非導電性樹脂チューブが摩耗して穴があいても、その穴から粉体塗料が非導電性樹脂チューブ内に侵入しないようにしたものである。   Furthermore, the introduction of air or inert gas into the non-conductive resin tube that covers the electrode ensures that the powder coating does not adhere to the tip of the electrode, and the contact between the powder coating and the non-conductive resin tube Even if the non-conductive resin tube is worn and a hole is formed, the powder coating material is prevented from entering the non-conductive resin tube from the hole.

この発明によれば、以上のように、コロナ放電する電極への粉体塗料の付着を有効に防止できるので、ブツのない良好な塗膜を形成できると共に、電極の位置を調整することにより、塗装条件に最適な電場を形成することができ、塗着効率の高い最適な塗装が行える。   According to the present invention, as described above, the powder coating can be effectively prevented from adhering to the electrode that undergoes corona discharge, so that it is possible to form a good coating film without blisters, and by adjusting the position of the electrode, An electric field that is optimal for the coating conditions can be formed, and optimal coating with high coating efficiency can be achieved.

図1に示す静電粉体塗装ガン1は、粉体塗料を噴出する筒状のガン先2に、扇形の吐出パターンを形成するフラット式のノズル3を装着している。   The electrostatic powder coating gun 1 shown in FIG. 1 is equipped with a flat nozzle 3 that forms a fan-shaped discharge pattern on a cylindrical gun tip 2 from which powder paint is ejected.

筒状のガン先2には、高電圧発生器に接続された電極4がガン先2を貫通し、フラット式のノズル3の内側に引き出されている。   An electrode 4 connected to a high voltage generator passes through the gun tip 2 and is drawn inside the flat nozzle 3 at the cylindrical gun tip 2.

フラット式のノズル3の内側に突出する電極4は、ノズル3のフラットな吐出口9の中央部分まで引き出されている。   The electrode 4 projecting inside the flat nozzle 3 is drawn out to the center of the flat discharge port 9 of the nozzle 3.

電極4の材質は、タングステン、鉄、銅又はステンレス等の金属からなり、ノズル3内に突出する部分には、屈曲可能な非導電性樹脂チューブ5を被せ、ガン先2を通過する粉体塗料が電極4に接触しないようにしている。これにより、金属製の電極4に粉体塗料が付着したり、あるいは粉体塗料に含まれるメタリック顔料がこびり付いたりするのを防止できる。   The electrode 4 is made of a metal such as tungsten, iron, copper, or stainless steel, and a portion that protrudes into the nozzle 3 is covered with a bendable non-conductive resin tube 5 and passes through the gun tip 2. Does not contact the electrode 4. Thereby, it is possible to prevent the powder paint from adhering to the metal electrode 4 or the metallic pigment contained in the powder paint from being stuck.

非導電性樹脂チューブ5の材質としては、4フッ化エチレン樹脂の他、使用する粉体塗料に応じ、ナイロン系、ポリエチレン系、ポリアセタール系のものでもよい。   The material of the non-conductive resin tube 5 may be nylon, polyethylene, or polyacetal based on the powder coating used in addition to the tetrafluoroethylene resin.

電極4に被せられた非導電性樹脂チューブ5の後端は、図2及び図4に示すように、筒状のガン先2の端面に形成した固定穴に差し込まれている。   As shown in FIGS. 2 and 4, the rear end of the non-conductive resin tube 5 placed on the electrode 4 is inserted into a fixing hole formed on the end face of the cylindrical gun tip 2.

次に、図2〜図4の実施例では、電極4を、ガン先2の筒状部分に埋め込んで設置しているが、図5の実施例のように、ガン先2の筒状部分に、コンプレッサーエアーあるいは不活性ガスを通過させる貫通孔6を設け、この貫通孔6に電極4を通し、貫通孔6の先端側に非導電性樹脂チューブ5を差し入れ、貫通孔6に供給したコンプレッサーエアー又は不活性ガスが、非導電性樹脂チューブ5内を通過して、非導電性樹脂チューブ5の先端から流出するようにしてもよい。   Next, in the embodiment of FIGS. 2 to 4, the electrode 4 is embedded and installed in the cylindrical portion of the gun tip 2, but as in the embodiment of FIG. The compressor air supplied through the through-hole 6 is provided with a through-hole 6 through which compressor air or inert gas passes, the electrode 4 is passed through the through-hole 6, and a non-conductive resin tube 5 is inserted into the tip of the through-hole 6. Alternatively, the inert gas may pass through the nonconductive resin tube 5 and flow out from the tip of the nonconductive resin tube 5.

このように、非導電性樹脂チューブ5の先端からエアー又は不活性ガスを流出させることにより、電極4の先端への粉体塗料の付着が確実に防止される。また、ノズル3内の非導電性樹脂チューブ5には、絶えず粉体塗料が衝突し、この衝突によって非導電性樹脂チューブ5が摩耗して穴があいたとしても、上記のように、非導電性樹脂チューブ5内にエアー又は不活性ガスを通過させることにより、非導電性樹脂チューブ5内が常に陽圧状態に保たれるので、非導電性樹脂チューブ5の穴から粉体塗料が非導電性樹脂チューブ5内に侵入するということを防止できる。   In this way, by causing air or inert gas to flow out from the tip of the non-conductive resin tube 5, adhesion of the powder paint to the tip of the electrode 4 is reliably prevented. Even if the non-conductive resin tube 5 in the nozzle 3 constantly collides with the powder coating and the collision causes the non-conductive resin tube 5 to wear and have a hole, as described above, the non-conductive resin tube 5 By allowing air or inert gas to pass through the resin tube 5, the inside of the non-conductive resin tube 5 is always kept in a positive pressure state, so that the powder paint is non-conductive from the hole of the non-conductive resin tube 5. Intrusion into the resin tube 5 can be prevented.

次に、図6は、ブース7内に粉体塗料を噴霧させ、ブース7内に設置した高電圧を印加する電極4により粉体塗料を帯電させるコロナ帯電式塗装装置の実施例である。ブース7は、非導電性の樹脂パネルによって形成されている。   Next, FIG. 6 shows an embodiment of a corona charging type coating apparatus in which powder paint is sprayed in the booth 7 and the powder paint is charged by the electrode 4 applied in the booth 7 to which a high voltage is applied. The booth 7 is formed of a nonconductive resin panel.

この図6の実施例では、被塗物Aの全面に、コロナ放電による電界が生じるように、電極4を分岐させ、分岐した電極4が、被塗物Aの側面、並びに上下面に位置するようにしている。そして、被塗物Aの上下面に位置する電極4は、ブース7の中央付近にまで大きく引き出されており、この引き出した電極4の外面を、非導電性樹脂チューブ5で覆って、電極4の外面に粉体塗料が付着しないようにしている。   In the embodiment of FIG. 6, the electrode 4 is branched so that an electric field due to corona discharge is generated on the entire surface of the object A to be coated, and the branched electrodes 4 are positioned on the side surface and the upper and lower surfaces of the object A to be coated. I am doing so. The electrodes 4 positioned on the upper and lower surfaces of the article A are drawn out to the vicinity of the center of the booth 7. The outer surface of the drawn electrode 4 is covered with a non-conductive resin tube 5, and the electrode 4 The powder coating is prevented from adhering to the outer surface of the.

この図6の実施例においても、非導電性樹脂チューブ5は、屈曲可能になっており、被塗物Aの形状により、屈曲させて電極4の設置位置を調整することができる。   Also in the embodiment of FIG. 6, the non-conductive resin tube 5 can be bent, and the installation position of the electrode 4 can be adjusted by bending according to the shape of the article A to be coated.

また、この図6の実施例においても、電極4を埋設するブース7の壁面に、電極4を差し入れる貫通する通路8を設け、この通路8内に、コンプレッサーエアー又は不活性ガスを供給することにより、非導電性樹脂チューブ5内にコンプレッサーエアー又は不活性ガスを流入させ、非導電性樹脂チューブ5の先端から、エアー又は不活性ガスを流出させるようにしてもよい。   Also in the embodiment of FIG. 6, a passage 8 through which the electrode 4 is inserted is provided on the wall surface of the booth 7 in which the electrode 4 is embedded, and compressor air or inert gas is supplied into the passage 8. Thus, compressor air or inert gas may be caused to flow into the non-conductive resin tube 5, and air or inert gas may be allowed to flow out from the tip of the non-conductive resin tube 5.

なお、この図6の実施例において、符号Bは、噴霧された粉体塗料を示し、Cは流動エアーを示している。   In the embodiment of FIG. 6, the symbol B indicates the sprayed powder paint, and C indicates the flowing air.

次に、電極4を非導電性樹脂チューブ5で覆った図2に示すこの発明の静電粉体塗装ガン1と、電極4を非導電性樹脂チューブ5で覆っていない図7に示す従来の静電粉体塗装ガン1とで塗装実験を行い、塗装時間の経過により、被塗物の塗膜面に、どれ位の数のブツが発生するかを調査した。その結果を表1に示した。表2は、塗着効率の時間的変化を示している。非導電性樹脂チューブ5としては、テフロン製のものを使用した。
なお、表1において、ブツの数とは、各時間内での合計個数である。
Next, the electrostatic powder coating gun 1 of the present invention shown in FIG. 2 in which the electrode 4 is covered with a non-conductive resin tube 5 and the conventional electrode shown in FIG. 7 in which the electrode 4 is not covered with the non-conductive resin tube 5. A coating experiment was conducted with the electrostatic powder coating gun 1, and it was investigated how many spots occurred on the coating surface of the object to be coated as the coating time passed. The results are shown in Table 1. Table 2 shows the temporal change in the coating efficiency. As the non-conductive resin tube 5, a tube made of Teflon was used.
In Table 1, the number of irregularities is the total number in each time.

Figure 0005352799
Figure 0005352799

Figure 0005352799
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表1に示す通り、電極4を非導電性樹脂チューブ5で覆った図2に示すこの発明の静電粉体塗装ガン1の場合、電極4を非導電性樹脂チューブ5で覆っていない図7に示す従来の静電粉体塗装ガン1よりも圧倒的にブツの発生が少なかった。また、表2に示す通り、電極4を非導電性樹脂チューブ5で覆った図2に示すこの発明の静電粉体塗装ガン1の場合の方が、電極4を非導電性樹脂チューブ5で覆っていない図7に示す従来の静電粉体塗装ガン1よりも塗着効率の時間的変化が少なく、長時間に亘り高い塗着効率を維持できた。   As shown in Table 1, in the case of the electrostatic powder coating gun 1 of the present invention shown in FIG. 2 in which the electrode 4 is covered with the non-conductive resin tube 5, the electrode 4 is not covered with the non-conductive resin tube 5. FIG. As compared with the conventional electrostatic powder coating gun 1 shown in FIG. Further, as shown in Table 2, in the case of the electrostatic powder coating gun 1 of the present invention shown in FIG. 2 in which the electrode 4 is covered with the nonconductive resin tube 5, the electrode 4 is replaced with the nonconductive resin tube 5. The temporal change of the coating efficiency was less than that of the conventional electrostatic powder coating gun 1 shown in FIG. 7 which was not covered, and the high coating efficiency could be maintained for a long time.

なお、表1、表2の実験は、吐出量70g/minの塗装ガンを2ガン使用し、レシプロケータによって往復動させながら、高さ1000mm、幅500mmの金属製の平板形状の被塗物に対して粉体塗料を噴霧して行った。コンベアスピードは、1.0m/minで、ハンガー間隔は、600mmであった。   In the experiments in Tables 1 and 2, two coating guns with a discharge rate of 70 g / min were used, and a metal plate-shaped object having a height of 1000 mm and a width of 500 mm was used while reciprocating with a reciprocator. On the other hand, the powder coating was sprayed. The conveyor speed was 1.0 m / min, and the hanger interval was 600 mm.

また、非導電性樹脂チューブ5内にコンプレッサーエアーを流入させる図5に示すこの発明の静電粉体塗装ガン1を使用し、エアーを流入させた場合と、非導電性樹脂チューブ5内にコンプレッサーエアーを流入させない図4に示す場合とについて、アルミ顔料をドライブレンドした粉体塗料の塗装実験を行い、塗装時間の経過により、塗着効率がどのように変化するかを調査した。その結果は、表3の通りであり、エアーを流入させると、エアーを流入させない場合よりも、長時間に亘って塗着効率の減少を防止できるということが確認できた。また、非導電性樹脂チューブ5で電極4を覆っていない従来例の場合は、約30分で、メタリック顔料がノズル3の吐出口を閉鎖する程に付着した。その他の塗装条件は、表1、表2の実験と同じである。   Further, when the electrostatic powder coating gun 1 of the present invention shown in FIG. 5 in which compressor air is caused to flow into the non-conductive resin tube 5 is used and air is caused to flow, the compressor is introduced into the non-conductive resin tube 5. With respect to the case shown in FIG. 4 in which no air is allowed to flow in, a coating experiment of a powder paint in which an aluminum pigment is dry blended was conducted to investigate how the coating efficiency changes with the lapse of the coating time. The result is as shown in Table 3. It was confirmed that when the air was introduced, it was possible to prevent the coating efficiency from decreasing for a longer time than when the air was not introduced. Further, in the case of the conventional example in which the electrode 4 is not covered with the non-conductive resin tube 5, the metallic pigment adhered to the extent that the discharge port of the nozzle 3 was closed in about 30 minutes. Other coating conditions are the same as the experiments in Tables 1 and 2.

Figure 0005352799
Figure 0005352799

なお、表3において、閉鎖とは、ガン先のノズルの吐出口が、電極に付着したアルミ顔料によって閉鎖された状態になったことをいい、異常とは、電極先端部にアルミ顔料が付着して過電流異常の状態を示したことをいう。   In Table 3, “closed” means that the discharge port of the nozzle at the tip of the gun has been closed by the aluminum pigment adhering to the electrode, and “abnormal” means that the aluminum pigment has adhered to the tip of the electrode. Indicates an overcurrent abnormal condition.

この発明に係る静電粉体塗装ガン1の斜視図である。1 is a perspective view of an electrostatic powder coating gun 1 according to the present invention. 図1のガン先部分の断面図である。It is sectional drawing of the gun tip part of FIG. 図1のガン先部分の正面図である。It is a front view of the gun tip part of FIG. 図1のガン先の電極部分の断面図である。It is sectional drawing of the electrode part of the gun tip of FIG. この発明に係る静電粉体塗装ガン1の他の実施形態のガン先の電極部分の断面図である。It is sectional drawing of the electrode part of the gun tip of other embodiment of the electrostatic powder coating gun 1 which concerns on this invention. この発明に係る静電粉体塗装装置の他の形態の概略構成図である。It is a schematic block diagram of the other form of the electrostatic powder coating apparatus which concerns on this invention. 従来例の静電粉体塗装ガンのガン先部分の断面図である。It is sectional drawing of the gun tip part of the electrostatic powder coating gun of a prior art example. 図7の正面図である。FIG. 8 is a front view of FIG. 7.

符号の説明Explanation of symbols

1 静電粉体塗装ガン
2 ガン先
3 ノズル
4 電極
5 非導電性樹脂チューブ
6 貫通孔
7 ブース
8 通路
1 Electrostatic powder coating gun 2 Gun tip 3 Nozzle 4 Electrode 5 Non-conductive resin tube 6 Through hole 7 Booth 8 Passage

Claims (3)

ブース内に粉体塗料を噴霧させ、ブース内に設置した高電圧を印加する電極により粉体塗料を帯電させるコロナ帯電式塗装装置において、上記ブース内に露出する電極を屈曲可能な非導電性樹脂チューブによって覆い、非導電性樹脂チューブを屈曲させてブース内の電極位置を調整可能としたことを特徴とするコロナ帯電式塗装装置。   Non-conductive resin that can bend the electrode exposed in the booth in a corona charging type coating device that sprays the powder paint in the booth and charges the powder paint with the high voltage applied electrode installed in the booth A corona charging type coating apparatus characterized in that the electrode position in the booth can be adjusted by covering with a tube and bending a non-conductive resin tube. 上記非導電性樹脂チューブと電極間の隙間に、エアーを流入させる請求項1記載のコロナ帯電式塗装装置。 Above the gap between the non-conductive resin tube and the electrode, a corona charging type coating apparatus according to claim 1 Symbol placement flowing the air. 上記非導電性樹脂チューブと電極間の隙間に、不活性ガスを流入させる請求項1記載のコロナ帯電式塗装装置。 Above the gap between the non-conductive resin tube and the electrode, a corona charging type coating apparatus according to claim 1 Symbol placement flowing the inert gas.
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