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WO1994008725A1 - Method and apparatus for coating electrostatic powder - Google Patents

Method and apparatus for coating electrostatic powder Download PDF

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Publication number
WO1994008725A1
WO1994008725A1 PCT/JP1993/001449 JP9301449W WO9408725A1 WO 1994008725 A1 WO1994008725 A1 WO 1994008725A1 JP 9301449 W JP9301449 W JP 9301449W WO 9408725 A1 WO9408725 A1 WO 9408725A1
Authority
WO
WIPO (PCT)
Prior art keywords
gun
powder coating
electrostatic powder
coated
electrostatic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP1993/001449
Other languages
French (fr)
Japanese (ja)
Inventor
Yasunari Okamoto
Masahiro Yamamoto
Mitsuyoshi Kumata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiheiyo Cement Corp
Original Assignee
Onoda Cement Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Onoda Cement Co Ltd filed Critical Onoda Cement Co Ltd
Priority to DE4395193T priority Critical patent/DE4395193T1/en
Priority to GB9407859A priority patent/GB2276340B/en
Publication of WO1994008725A1 publication Critical patent/WO1994008725A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • B05B16/95—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth the objects or other work to be sprayed lying on, or being held above the conveying means, i.e. not hanging from the conveying means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
    • B05D3/141—Plasma treatment
    • B05D3/142—Pretreatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
    • B05B5/084—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects the objects lying on, or being supported above conveying means, e.g. conveyor belts

Definitions

  • the present invention relates to an electrostatic powder coating method and an apparatus for use in recoating automobiles, electric washing machines, electric refrigerators, switchboards, pipes, and the like.
  • gun electrostatic powder coating gun
  • the surface to be coated is an insulating layer. If the gun is used at a normal voltage, the potential on the surface to be painted will increase and reverse ionization will occur, creating a crater.
  • the voltage of the gun is reduced to, for example, 40 to 60 KV when recoating, or the discharge amount of the powder paint is increased.
  • the adjustment is troublesome and the film thickness that can be recoated is limited. For example, it is best to overlay a 40-m thick film on a 60-m-th surface to be coated. Above this, reverse ionization occurs.
  • the voltage and the discharge amount of the paint must be adjusted according to the presence or absence of the baking coating film on the object. Since a dedicated operator is required, automation is difficult.
  • Conveying means for carrying an uncoated object and a baking-coated object; An electrostatic powder coating gun opposed to the transfer means; and a corona discharge means to which a voltage having a polarity opposite to that of the gun is applied and facing the transfer means upstream of the gun.
  • a voltage having a polarity opposite to that of the gun is applied to the corona discharge electrode of the discharge means. It becomes a potential of the opposite polarity.
  • the object to be coated is carried to the front of the gun in this state, and the electrostatic powder coating charged by the gun is electrostatically applied to the surface to be baked.
  • FIG. 1 is a front view showing a first embodiment of the present invention
  • FIG. 2 is an enlarged view of the repainted article of FIG. 1
  • FIG. 3 is an enlarged view of the cloth painted article of FIG.
  • FIG. 4 is a perspective view showing a second embodiment of the present invention
  • FIG. 5 is a perspective view showing a third embodiment of the present invention.
  • the electrostatic powder coating device 1 is composed of an electrostatic powder coating gun 2, a corona discharge device 3, and a conductive belt conveyor 4.
  • An electrostatic powder coating gun (hereinafter simply referred to as a gun) 2 is provided downward at the center of the cover 5, and the gun 2 can perform reciprocating motion by means of a reciprocating lamp 7.
  • the corona discharge device 3 is provided upstream of the gun 2 and includes a high voltage generator 10 and a corona pin (corona discharge electrode) 11.
  • the corona pin 11 can perform reciprocating exercise by reciprocating overnight 12.
  • the conductive belt conveyor 4 transports the objects 20 and 30 to be coated, and is grounded via the rotating device 21.
  • the object to be coated 20 is an unpainted iron plate 20a, a so-called painted material
  • the object to be coated 30 is an iron plate 20a having a baking coating layer 30a, a so-called repainted object. is there.
  • a predetermined voltage for example, a negative voltage of 80 KV is applied to the gun 2 and a voltage having a polarity opposite to that of the gun 2, that is, a positive voltage is applied to the corona pin 11 of the corona discharge device 3. Then, the conductive belt conveyor 4 is driven, and the objects 20 and 30 placed at intervals are conveyed in the direction of arrow A4.
  • the baking coating layer 30a becomes a positive potential by corona discharge, and its surface potential rises.
  • the surface potential at this time is appropriately selected, but is preferably in the range of 200 V to 3 KV. This surface potential can be controlled by changing the applied voltage, the discharge distance, and the discharge time.
  • the object 30 is carried below the gun 2, and the powder coating 40 charged on the negative electrode is electrostatically applied to form a coating film 50.
  • the positive surface potential, ie, + ion, and the applied voltage of the gun 2, ie,-ion, are offset and neutralized, so that the painted surface has a high potential enough to cause reverse ionization. Will not be. Therefore, the coating film 50 has no clay and the coating film 50 is tight and stable. Therefore, the finish of the paint film is good and the paint film can be prevented from dropping during transfer.
  • the voltage of the electrostatic powder coating gun 2 does not need to be lowered, so that the coating efficiency does not decrease.
  • the gun 2 and the corona discharge device 3 were operated under the same conditions. However, if the object to be coated is a cloth-coated object 20, a corona discharge is performed by the corona discharge device 3. Since the cloth-coated object 20 is grounded, + corona ion (positive charge) Will flow.
  • the object to be coated 20 is subjected to electrostatic coating in the same state as when directly applied by a gun without passing through a corona discharge device.
  • the electrostatic coating can be performed under the same conditions regardless of whether the baked coating films of the objects 20 and 30 are coated, the automation of the coating operation is facilitated.
  • the electrostatic powder coating device 70 is composed of an electrostatic powder coating gun 2, a corona discharge device 3, and an overhead conveyor 61.
  • the corona discharge device 3 is provided upstream of the gun 2 and includes a high voltage generator 10 and a corona pin (corona discharge electrode) 11.
  • the gun 2 and the corona pin 11 can reciprocate up and down by reciprocal motion 7.
  • the over-head conveyor 61 transports the object 60 to be coated, and is grounded.
  • a predetermined voltage for example, a negative voltage of 80 KV is applied to the gun 2 and a voltage having a polarity opposite to that of the gun 2, that is, a positive voltage is applied to the corona pin 11 of the corona discharge device 3. Then, the overhead conveyor 61 is driven, and the object 60 suspended on the hanger is transported in the direction of arrow A4 at intervals.
  • the surface of the object becomes a positive potential due to corona discharge, and the surface potential rises.
  • the surface potential at this time is appropriately selected, but is preferably in the range of 200 V to 3 KV. This surface potential can be controlled by changing the applied voltage, the discharge distance, and the discharge time.
  • the object 60 to be coated is carried forward of the gun 2, and the negatively charged powder coating material 40 is electrostatically applied to form a coating film 50.
  • the positive surface potential, ie, + ion, and the applied voltage of the gun 2, ie, one ion, are canceled and neutralized, so that the painted surface has a high electric potential such that reverse ionization occurs. No place. Therefore, the coating film 50 has no clay and the coating film 50 is tight and stable. Therefore, the finish of the paint film is good and the paint film can be prevented from dropping during transfer.
  • the voltage of the electrostatic powder coating gun 2 does not need to be lowered, so that the coating efficiency does not decrease.
  • UF is a powder paint supply device that supplies powder paint to the gun 2.
  • a third embodiment of the present invention will be described with reference to FIG. 5.A difference between this embodiment and the first embodiment is that a plurality of corona pins 11 of a corona discharge device 104 are provided. Further, all the objects to be coated are the repainted objects 30. A plurality of the corona pins 11 are arranged at intervals L, for example, 15 O mm in a direction orthogonal to the longitudinal direction of the conductive belt conveyor 4. In this embodiment, ions of the opposite polarity to the electrostatic powder coating gun 2 adhere to the entire surface of the repainted object 30, so that the surface potential of the object to be coated becomes uniform. Therefore, the film thickness distribution of the object to be coated is improved.
  • the embodiment of the present invention is not limited to the above.
  • powder coating is performed.
  • the object to be coated is transported by a conveyor that penetrates the inside of the cover.
  • the powder may be collected with a hopper provided on the bottom of the cover.
  • the electrostatic powder coating method and apparatus according to the present invention can be widely used for recoating automobiles, electric washing machines, electric refrigerators, switchboards, pipes, and the like.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

On the upstream side of an electrostatic powder coating gun (2), corona discharging means (3) and (104) are provided to apply a voltage of the opposite polarity to that of the gun (2). Before the baking-finished surface of objects (20) and (30) are coated with charged powder, ions are neutralized by providing the baking-finished surfaces with electric potentials of the opposite polarity of the charged powder, thus preventing reverse discharge.

Description

明 細 静電粉体塗装方法及びその装置 技術分野  Technical Field Electrostatic powder coating method and its equipment

この発明は、 自動車、 電気洗濯機、 電気冷蔵庫、 配電盤、 パイプ等のリ コート に用いられる静電粉体塗装方法及びその装置に関するものである。 背景技術  The present invention relates to an electrostatic powder coating method and an apparatus for use in recoating automobiles, electric washing machines, electric refrigerators, switchboards, pipes, and the like. Background art

未塗装の被塗物を塗装する場合には、 通常静電粉体塗装ガン （以下単にガンと いう） を 8 0 K Vで使用する。  When painting unpainted objects, usually use an electrostatic powder coating gun (hereinafter simply referred to as gun) at 80 KV.

ところが、 焼付けを終了、 又は、 半焼付け状態の被塗装面に更に重ねて静電粉 体塗装を行う、 所謂、 リ コート、 の場合には、 被塗装面が絶縁層となっているの で、 ガンを通常の電圧で使用すると被塗装面の電位が高くなり逆電離が発生し、 クレーターができてしまう。  However, in the case of finishing the baking or further applying electrostatic powder coating on the surface to be coated in a semi-baked state, so-called recoating, the surface to be coated is an insulating layer. If the gun is used at a normal voltage, the potential on the surface to be painted will increase and reverse ionization will occur, creating a crater.

そこで従来、 この問題を解決するため、 リコートする際にガンの電圧を、 例え ば 4 0〜6 0 K Vに下げたり、 又は、 粉体塗料の吐出量を増やしたり している。 従来例は、 いずれも調整が面倒な上、 リ コートできる膜厚にも限界がある。 例えば、 6 0 mの厚さの被塗装面に 4 0 mの厚さの膜を重ねるのがせいぜ いであり、 これを越えると逆電離が発生する。 又、 未塗装の被塗物と焼付塗装し た被塗物とを同じラインで塗装する場合には、 前記被塗物の焼付塗装膜の有無に 合わせて電圧や塗料の吐出量を調整しなければならないので、 専用の操作者が必 要となるため、 自動化は困難である。  Therefore, conventionally, in order to solve this problem, the voltage of the gun is reduced to, for example, 40 to 60 KV when recoating, or the discharge amount of the powder paint is increased. In the conventional examples, the adjustment is troublesome and the film thickness that can be recoated is limited. For example, it is best to overlay a 40-m thick film on a 60-m-th surface to be coated. Above this, reverse ionization occurs. When an unpainted object and a baking-coated object are painted on the same line, the voltage and the discharge amount of the paint must be adjusted according to the presence or absence of the baking coating film on the object. Since a dedicated operator is required, automation is difficult.

この発明は上記事情に鑑み、 焼付被塗装面に静電塗装する際に、 逆電離が発生 しないようにすることを目的とする。 他の目的は、 未塗装の被塗物と焼付塗装さ れた被塗物とを同一ライ ンで同一条件で静電塗装できるようにすることである。 発明の開示  In view of the above circumstances, it is an object of the present invention to prevent reverse ionization from occurring when electrostatically coating a surface to be baked. Another object is to enable unpainted and bake-coated objects to be electrostatically coated on the same line and under the same conditions. Disclosure of the invention

この発明は、 未塗装の被塗物と焼付塗装された被塗物とを運ぶ搬送手段と ； 該 搬送手段に対向する静電粉体塗装ガンと ； 該ガンと逆極性の電圧が印加され、 か つ、 該ガンより上流側の前記搬送手段と対向するコロナ放電手段と ； を備えてい る。 搬送手段により、 焼付塗装された被塗物がコロナ放電手段の前迄運ばると、 該放電手段のコロナ放電電極に該ガンと逆極性の電圧が印加され、 該焼付被塗装 面は該ガンと逆極性の電位となる。 Conveying means for carrying an uncoated object and a baking-coated object; An electrostatic powder coating gun opposed to the transfer means; and a corona discharge means to which a voltage having a polarity opposite to that of the gun is applied and facing the transfer means upstream of the gun. When the object to be baked and painted is transported to the corona discharge means by the transport means, a voltage having a polarity opposite to that of the gun is applied to the corona discharge electrode of the discharge means. It becomes a potential of the opposite polarity.

該被塗物は、 この状態で該ガンの前迄運ばれるとともに、 該ガンにより荷電さ れた静電粉体塗料は、 前記焼付被塗装面に静電塗着する。  The object to be coated is carried to the front of the gun in this state, and the electrostatic powder coating charged by the gun is electrostatically applied to the surface to be baked.

この時、 焼付被塗装面には粉体塗料のイオンと逆極性のイオンが付着している ので両イオンは中和し合う。  At this time, ions of the opposite polarity to the ions of the powder coating adhere to the surface to be baked, so that both ions neutralize each other.

そのため、 該ガンに通常電圧がかかっていても焼付被塗装面の電位は逆電離を 生ずる程までに高く ならない。  Therefore, even if a normal voltage is applied to the gun, the potential on the surface to be baked does not become high enough to cause reverse ionization.

次に、 未塗装の被塗物が該放電手段の前迄運ばれると、 該放電手段により発生 するコロナイオンは被塗装面に向かって飛来するが、 該被塗装面はアースされて いるため電荷は流れてしまう。 そして、 この被塗物は、 該ガンの前迄運ばれ、 静 電塗装される。 図面の簡単な説明  Next, when an unpainted object is carried to the front of the discharging means, corona ions generated by the discharging means fly toward the surface to be coated, but the surface to be coated is charged because it is grounded. Will flow. Then, the object to be coated is carried to the front of the gun and is electrostatically coated. BRIEF DESCRIPTION OF THE FIGURES

第 1図は本発明の第 1実施例を示す正面図、 第 2図は第 1図の再塗装物の拡大 図、 第 3図は第 1図の生地塗装物の拡大図である。  FIG. 1 is a front view showing a first embodiment of the present invention, FIG. 2 is an enlarged view of the repainted article of FIG. 1, and FIG. 3 is an enlarged view of the cloth painted article of FIG.

第 4図は本発明の第 2実施例を示す斜視図、 第 5図は本発明の第 3実施例を示 す斜視図である。 発明を実施するための最良の形態  FIG. 4 is a perspective view showing a second embodiment of the present invention, and FIG. 5 is a perspective view showing a third embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

この本発明の第 1実施例を第 1図〜第 3図により説明する。  A first embodiment of the present invention will be described with reference to FIGS.

静電粉体塗装装置 1 は、 静電粉体塗装ガン 2とコロナ放電装置 3と導電性べ ルトコンべャ 4 とから構成されている。 静電粉体塗装ガン （以下単にガンという ) 2は、 カバー 5の中央部に下向きに設けられているが、 該ガン 2はレシプロケ —夕 7によりレシプロ運動することができる。  The electrostatic powder coating device 1 is composed of an electrostatic powder coating gun 2, a corona discharge device 3, and a conductive belt conveyor 4. An electrostatic powder coating gun (hereinafter simply referred to as a gun) 2 is provided downward at the center of the cover 5, and the gun 2 can perform reciprocating motion by means of a reciprocating lamp 7.

カバー 5の出入口にはそれぞれ排気ダク ト 6、 6 が設けられている c コロナ放電装置 3はガン 2の上流に設けられ、 高電圧発生装置 1 0とコロナピ ン （コロナ放電電極） 1 1 とを備えている。 Exhaust ducts 6 and 6 are provided at the entrance and exit of the cover 5, respectively.c The corona discharge device 3 is provided upstream of the gun 2 and includes a high voltage generator 10 and a corona pin (corona discharge electrode) 11.

このコロナピン 1 1はレシプロケ一夕 1 2によりレシプロ運動することができ る。 導電性ベルトコンベア 4は、 被塗物 2 0、 3 0を搬送するもので、 回転装 置 2 1を介して接地されている。  The corona pin 11 can perform reciprocating exercise by reciprocating overnight 12. The conductive belt conveyor 4 transports the objects 20 and 30 to be coated, and is grounded via the rotating device 21.

被塗物 2 0は、 未塗装の鉄板 2 0 a、 所謂生地塗装物であり、 被塗物 3 0は鉄 板 2 0 aに焼付塗装層 3 0 aを形成したもの、 所謂再塗装物である。  The object to be coated 20 is an unpainted iron plate 20a, a so-called painted material, and the object to be coated 30 is an iron plate 20a having a baking coating layer 30a, a so-called repainted object. is there.

次に本実施例の作動について説明する。  Next, the operation of the present embodiment will be described.

ガン 2に所定電圧、 例えば、 負極性の 8 0 K Vの電圧を印加するとともにコロ ナ放電装置 3のコロナピン 1 1 にガン 2と逆極性の電圧、 即ち、 正極性の電圧を 印加する。 そして、 導電性ベルトコンペャ 4を駆動し、 間隔をおいて載置した被 塗物 2 0、 3 0を矢印 A 4方向に搬送する。  A predetermined voltage, for example, a negative voltage of 80 KV is applied to the gun 2 and a voltage having a polarity opposite to that of the gun 2, that is, a positive voltage is applied to the corona pin 11 of the corona discharge device 3. Then, the conductive belt conveyor 4 is driven, and the objects 20 and 30 placed at intervals are conveyed in the direction of arrow A4.

再塗装物 3 0がコロナ放電装置 3の下方に運ばれると、 コロナ放電により焼付 塗装層 3 0 aは正極性の電位となり、 その表面電位が上昇する。  When the repainted object 30 is carried below the corona discharge device 3, the baking coating layer 30a becomes a positive potential by corona discharge, and its surface potential rises.

この時の表面電位は、 適宜選択されるが、 2 0 0 V〜3 K Vの範囲内が好 適である。 この表面電位は、 印加電圧、 放電距離、 放電時間を変化させることに よりコン トロールすることができる。  The surface potential at this time is appropriately selected, but is preferably in the range of 200 V to 3 KV. This surface potential can be controlled by changing the applied voltage, the discharge distance, and the discharge time.

なお、 コロナ放電の際、 レシプロケ一夕 1 2を駆動してコロナピン 1 1 をレシ プロ運動させると、 表面電位が均一になり膜厚分布が良く なる。  During corona discharge, when the reciprocating pin 12 is driven and the corona pin 11 is reciprocally moved, the surface potential becomes uniform and the film thickness distribution is improved.

次に、 この被塗物 3 0はガン 2の下方に運ばれるとともに、 負極に帯電した 粉体塗料 4 0が静電塗着し塗膜 5 0が形成される。  Next, the object 30 is carried below the gun 2, and the powder coating 40 charged on the negative electrode is electrostatically applied to form a coating film 50.

この時、 正極性の表面電位、 即ち、 +イオン、 とガン 2の印加電圧、 即ち、 — イオン、 とは相殺され中和されるので、 該塗装表面は逆電離が発生する程の高電 位となることはない。 従って、 クレー夕のない塗膜 5 0となるとともに、 該塗膜 5 0は締まりもよく安定している。 そのため、 塗装膜の仕上がりが良好であると ともに、 移載の際等における塗料の膜落を防止できる。  At this time, the positive surface potential, ie, + ion, and the applied voltage of the gun 2, ie,-ion, are offset and neutralized, so that the painted surface has a high potential enough to cause reverse ionization. Will not be. Therefore, the coating film 50 has no clay and the coating film 50 is tight and stable. Therefore, the finish of the paint film is good and the paint film can be prevented from dropping during transfer.

また、 従来例と異なり静電粉体塗装ガン 2の電圧を下げなく てもよいので、 塗 着効率が低下することもない。  Further, unlike the conventional example, the voltage of the electrostatic powder coating gun 2 does not need to be lowered, so that the coating efficiency does not decrease.

被塗物 2 0の塗装においても前記ガン 2とコロナ放電装置 3とを同一条件で運 転するが、 被塗物が生地塗装物 2 0である場合にはコロナ放電装置 3によりコロ ナ放電を行うと、 該生地被塗物 2 0はアースされ いるため、 +コロナイオン （ 正電荷） は流れてしまう。 In the coating of the workpiece 20, the gun 2 and the corona discharge device 3 were operated under the same conditions. However, if the object to be coated is a cloth-coated object 20, a corona discharge is performed by the corona discharge device 3. Since the cloth-coated object 20 is grounded, + corona ion (positive charge) Will flow.

そのため、 該被塗物 2 0はコロナ放電装置を通さないで、 直接ガンにより塗装 する場合と同一の状態で静電塗装が行われる。  Therefore, the object to be coated 20 is subjected to electrostatic coating in the same state as when directly applied by a gun without passing through a corona discharge device.

このように、 被塗物 2 0、 3 0の焼付塗装膜の優無にかかわらず同一条件で静 電塗装を行えるので、 塗装作業の自動化を図ることが容易となる。  As described above, since the electrostatic coating can be performed under the same conditions regardless of whether the baked coating films of the objects 20 and 30 are coated, the automation of the coating operation is facilitated.

本発明の第 2実施例を第 4図により説明する。  A second embodiment of the present invention will be described with reference to FIG.

静電粉体塗装装置 7 0は、 静電粉体塗装ガン 2とコロナ放電装置 3とオーバー へッ ドコンペャ 6 1 とから構成されている。  The electrostatic powder coating device 70 is composed of an electrostatic powder coating gun 2, a corona discharge device 3, and an overhead conveyor 61.

コロナ放電装置 3は該ガン 2の上流に設けられ、 高電圧発生装置 1 0と コロナピン （コロナ放電電極） 1 1 とを備えている。  The corona discharge device 3 is provided upstream of the gun 2 and includes a high voltage generator 10 and a corona pin (corona discharge electrode) 11.

該ガン 2とコロナピン 1 1 とはレシプロケ一夕 7により上下のレシプロ運動す ることができる。 オーバーへッ ドコンベア 6 1は、 被塗物 6 0を搬送するもので 、 接地されている。  The gun 2 and the corona pin 11 can reciprocate up and down by reciprocal motion 7. The over-head conveyor 61 transports the object 60 to be coated, and is grounded.

次に本実施例の作動について説明する。  Next, the operation of the present embodiment will be described.

ガン 2に所定電圧、 例えば、 負極性の 8 0 K Vの電圧を印加するとともにコロ ナ放電装置 3のコロナピン 1 1 にガン 2と逆極性の電圧、 即ち、 正極性の電圧を 印加する。 そして、 オーバーヘッ ドコンペャ 6 1 を駆動し、 間隔をおいてハンガ に吊された被塗物 6 0を矢印 A 4方向に搬送する。  A predetermined voltage, for example, a negative voltage of 80 KV is applied to the gun 2 and a voltage having a polarity opposite to that of the gun 2, that is, a positive voltage is applied to the corona pin 11 of the corona discharge device 3. Then, the overhead conveyor 61 is driven, and the object 60 suspended on the hanger is transported in the direction of arrow A4 at intervals.

塗装物 6 0がコロナピン 1 1 の前方に運ばれると、 コロナ放電により被塗物の 表面は、 正極性の電位となり、 その表面電位が上昇する。  When the painted object 60 is carried in front of the corona pin 11, the surface of the object becomes a positive potential due to corona discharge, and the surface potential rises.

この時の表面電位は、 適宜選択されるが、 2 0 0 V〜 3 K Vの範囲内が好適で ある。 この表面電位は、 印加電圧、 放電距離、 放電時間を変化させることにより コン トロールすることができる。  The surface potential at this time is appropriately selected, but is preferably in the range of 200 V to 3 KV. This surface potential can be controlled by changing the applied voltage, the discharge distance, and the discharge time.

次に、 この被塗物 6 0はガン 2の前方に運ばれ、 負極に帯電した粉体塗料 4 0が静電塗着し塗膜 5 0が形成される。  Next, the object 60 to be coated is carried forward of the gun 2, and the negatively charged powder coating material 40 is electrostatically applied to form a coating film 50.

この時、 正極性の表面電位、 即ち、 +イオン、 とガン 2の印加電圧、 即ち、 一 イオン、 とは相殺され中和されるので、 該塗装表面は逆電離が発生する程の高電 位となることはない。 従って、 クレー夕のない塗膜 5 0となるとともに、 該塗膜 5 0は締まりもよく安定している。 そのため、 塗装膜の仕上がりが良好であると ともに、 移載の際等における塗料の膜落を防止できる。 At this time, the positive surface potential, ie, + ion, and the applied voltage of the gun 2, ie, one ion, are canceled and neutralized, so that the painted surface has a high electric potential such that reverse ionization occurs. No place. Therefore, the coating film 50 has no clay and the coating film 50 is tight and stable. Therefore, the finish of the paint film is good and the paint film can be prevented from dropping during transfer.

また、 従来例と異なり静電粉体塗装ガン 2の電圧を下げなく てもよいので、 塗 着効率が低下することもない。  Further, unlike the conventional example, the voltage of the electrostatic powder coating gun 2 does not need to be lowered, so that the coating efficiency does not decrease.

なお、 U Fは、 ガン 2に紛体塗料を供給する紛体塗料供給装置である。  Note that UF is a powder paint supply device that supplies powder paint to the gun 2.

この本発明の第 3実施例を第 5図により説明するが、 この実施例と第 1実施例 との相違点は、 コロナ放電装置 1 0 4のコロナピン 1 1が複数本配設されており、 又、 被塗物が全て再塗装物 3 0であること、 である。 このコロナピン 1 1 は、 導 電性ベルトコンペャ 4の長手方向と直交する方向に間隔 L、 例えば、 1 5 O mmを おいて複数本配設されている。 この実施例では、 再塗装物 3 0の全塗装面にわた つて静電粉体塗装ガン 2 と逆極性のイオンが付着するので、 該被塗物の表面電位 が均一となる。 そのため、 該被塗物の膜厚分布が良く なる。  A third embodiment of the present invention will be described with reference to FIG. 5.A difference between this embodiment and the first embodiment is that a plurality of corona pins 11 of a corona discharge device 104 are provided. Further, all the objects to be coated are the repainted objects 30. A plurality of the corona pins 11 are arranged at intervals L, for example, 15 O mm in a direction orthogonal to the longitudinal direction of the conductive belt conveyor 4. In this embodiment, ions of the opposite polarity to the electrostatic powder coating gun 2 adhere to the entire surface of the repainted object 30, so that the surface potential of the object to be coated becomes uniform. Therefore, the film thickness distribution of the object to be coated is improved.

この発明の実施例は、 上記に限定されるものではなく、 例えば、 自動車ボデー の塗装のように鉄板の上に塗装と乾燥 （焼き付け） を何回か繰り返した後、 紛体 塗装を行なう場合には、 カバー内を貫通するコンペャで被塗物を搬送し、 1台の レシプロケ一夕にコンペャの搬送方向に対し上流側にコロナ放電装置を搭載し、 また、 下流側にガンを搭載し、 オーバースプレー粉をカバー底面に設けられたホ ツバで回収してもよい。 産業上の利用可能性  The embodiment of the present invention is not limited to the above. For example, when coating and drying (baking) are repeatedly performed on an iron plate several times as in the case of painting an automobile body, powder coating is performed. The object to be coated is transported by a conveyor that penetrates the inside of the cover. The powder may be collected with a hopper provided on the bottom of the cover. Industrial applicability

以上のように本発明にかかる静電粉体塗装方法及びその装置は、 自動車、 電気 洗濯機、 電気冷蔵庫、 配電盤、 パイプ等のリコートに広く用いることができる。  As described above, the electrostatic powder coating method and apparatus according to the present invention can be widely used for recoating automobiles, electric washing machines, electric refrigerators, switchboards, pipes, and the like.

Claims

1. 荷電粉体塗料を被塗物 （20) (30) の焼付被塗装面に静電塗着させる 前に、 該焼付被塗装面を前記荷電粉体塗料と逆極性の電位にすることを特徴とす る静電粉体塗装方法。 1. Before applying the charged powder paint electrostatically to the surface to be baked of the objects to be coated (20) and (30), the surface to be baked should have a potential of the opposite polarity to that of the charged powder paint. Characteristic electrostatic powder coating method. 2. 焼付塗装された被塗物 （ 30)'と未塗装の被塗物 （20) とを搬送しなが ら、 その被塗装面に荷電粉体塗料を静電塗着する静電粉体塗装方法であって、 そ の静電塗着前に、 前記焼付被塗装面を前記荷電粉体塗料と逆極性の電位にするこ とを特徴とする静電粉体塗装方法。  2. Electrostatic powder that applies a charged powder paint to the surface to be coated while transporting the baking-coated object (30) 'and the unpainted object (20). A coating method, wherein the surface to be baked is set to a potential having a polarity opposite to that of the charged powder coating before the electrostatic coating. 一 -α-主目  One-α-principal 3. 焼付被塗装面の電位が、 200V〜3KVであることを特徴とする請求の 範囲第 1項、 または第 2項記載の静電粉体塗装方法。  3. The electrostatic powder coating method according to claim 1, wherein the potential on the surface to be baked is 200 V to 3 KV. の  of 4. 静電粉体塗装ガン （2) と ； 該ガン （2) と逆極性の電圧が印加されるコ ロナ放電手段 （3) ( 1 04) と ； を備えていることを特徴とする静電粉体塗装 囲  4. An electrostatic powder coating gun (2); and a corona discharge means (3) (104) to which a voltage having a polarity opposite to that of the gun (2) is applied. Powder coating 5. 未塗装の被塗物 （20) と焼付塗装された被塗物 （30) とを運ぶ搬送手 段 （4) と ；該搬送手段 （4) に対向する静電粉体塗装ガン （2) と ； 該ガン （ 2) と逆極性の電圧が印加され、 かつ、 該ガン （2) より上流側の前記搬送手段 (4 ) と対向するコロナ放電手段 （3) ( 1 04) と ； を備えていることを特徴 とする静電粉体塗装装置。 5. A transport means (4) for carrying the unpainted workpiece (20) and the bake-coated workpiece (30); and an electrostatic powder coating gun (2) facing the transport means (4). And a corona discharge means (3) (104) to which a voltage having a polarity opposite to that of the gun (2) is applied and opposed to the transport means (4) upstream of the gun (2). An electrostatic powder coating device, comprising: 6. 静電粉体塗装ガン （2) が、 レシプロケ一夕 （7) を備えていることを特 徴とする請求の範囲第 4項、 または第 5項記載の静電粉体塗装装置。  6. The electrostatic powder coating apparatus according to claim 4, wherein the electrostatic powder coating gun (2) is provided with a reciprocating lamp (7). 7. コロナ放電手段 （3) ( 1 04) せ、 レシプロケ一夕 （ 1 2) を備えてい ることを特徴とする請求の範囲第 4項、 または第 5項記載の静電粉体塗装装置。  7. The electrostatic powder coating apparatus according to claim 4 or 5, further comprising a corona discharge means (3) (104) and a reciprocator (12). 8. コロナ放電手段 （3) ( 1 04) 、 多数のコロナピン （ 1 1 ) を備えて いることを特徴とする請求の範囲第 4項、 または、 第 5項記載の静電粉体塗装装 置。  8. The electrostatic powder coating apparatus according to claim 4, wherein the corona discharge means (3) (104) and a large number of corona pins (111) are provided. . 9. 搬送手段 （4 ) せ、 導電性ベルトコンペャ （4 ) であることを特徴とする 請求の範囲第 4項、 または、 第 5項記載の静電粉体塗装装置。  9. The electrostatic powder coating apparatus according to claim 4, wherein the conveying means (4) is a conductive belt conveyor (4).
PCT/JP1993/001449 1992-10-08 1993-10-07 Method and apparatus for coating electrostatic powder Ceased WO1994008725A1 (en)

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JP5838697B2 (en) * 2011-09-29 2016-01-06 ダイキン工業株式会社 Electrostatic spray deposition system
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IT201800004997A1 (en) * 2018-05-02 2019-11-02 PLANT AND METHOD FOR CARRYING OUT COATINGS OF NANOMATERIALS ON OBJECT SURFACES, IN PARTICULAR LIGHTING
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JP3362230B2 (en) 2003-01-07
GB2276340A (en) 1994-09-28

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