JPS61157381A - Electrostatic powder painting method - Google Patents
Electrostatic powder painting methodInfo
- Publication number
- JPS61157381A JPS61157381A JP27642984A JP27642984A JPS61157381A JP S61157381 A JPS61157381 A JP S61157381A JP 27642984 A JP27642984 A JP 27642984A JP 27642984 A JP27642984 A JP 27642984A JP S61157381 A JPS61157381 A JP S61157381A
- Authority
- JP
- Japan
- Prior art keywords
- powder coating
- spray gun
- powdery paint
- painted
- coating layer
- 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.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発ＢＡｉ−ｔ、水道管及びその配管部品１例えば、
エルボ、ブランチやパルプなどのように厚塗りを要する
被塗物の静電粉体塗装方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Fields of Industrial Application This BAi-t, water pipes and their piping parts 1, for example,
This invention relates to an electrostatic powder coating method for objects that require thick coating, such as elbows, branches, and pulp.
従来の技術
静電粉体塗装方法は、粉体塗料を帯電させ、電気力によ
ってこれを被塗物に向って駆動して塗着し、これを焼付
けて成膜させる塗装法であるが、この方法では、最大限
２００〜２５０μｍの膜厚しか得られないので、３００
μｍ以上の膜厚を要求される水道管の配管部品などの塗
装には、使用できない。また、膜厚が１５０ｕｒｒＬを
越すと、塗着粉体層に逆電離によるクレータ−が発生し
やすく、これを焼付けても局所的に塗膜のうすい部分が
できて、充分な塗装の効果をあげえない場合が多くなる
。Conventional electrostatic powder coating method is a coating method in which powder coating is electrically charged, applied by driving it toward the object to be coated using electric force, and then baked to form a film. With this method, a maximum film thickness of only 200 to 250 μm can be obtained;
It cannot be used for painting plumbing parts such as water pipes that require a film thickness of more than μm. In addition, if the film thickness exceeds 150 urrL, craters are likely to occur in the applied powder layer due to reverse ionization, and even if this is baked, thin areas of the paint film will be formed locally, making it difficult to achieve a sufficient coating effect. There are many cases where this is not possible.
本発明は、上記の点に鑑み、表面が平滑で膜厚に見合う
充分な塗膜性能をもつ厚膜を得ることを目的とする。In view of the above points, the present invention aims to obtain a thick film with a smooth surface and sufficient coating performance commensurate with the film thickness.
問題点を解決するための手段
本発明は、被塗物の表面に粉体塗料層を、その極性を交
互に変えて複数回静電塗着し、該複数回の静電塗着中、
最終回に静電塗着する粉体塗料層の極性を負極性にする
と共に、初回に静電塗着する粉体塗料層の厚さを、他の
回のそれよりも厚く形成することにより、上記の問題点
を解決せんとするものである。Means for Solving the Problems The present invention provides a method of electrostatically coating a powder coating layer on the surface of an object to be coated multiple times with alternating polarity, and during the multiple electrostatic coatings,
By making the polarity of the powder coating layer electrostatically applied in the final coating negative, and by forming the powder coating layer electrostatically applied in the first coating to be thicker than that in other coatings, This is an attempt to solve the above problems.
実施例 以下、本発明の実施例を添附図面によシ説明する。Example Embodiments of the present invention will be described below with reference to the accompanying drawings.
図においてｌ；ｊ、被塗物、例えばバルブで、通常、接
地されている。In the figure, l; j is an object to be coated, such as a valve, which is usually grounded.
電源装置２ Ｆ（は、二個の直流電源３．４とスイッチ
５の接点６．７が設けられている。The power supply device 2F (is provided with two DC power supplies 3.4 and a contact point 6.7 of the switch 5.
８は、帯電粉体塗料９を被塗物ｌの表面に向って噴射せ
しめるスプレーカンで、スイッチ５を介して電源装置２
に連結されている。又、このスプレーガン８ｉ１ｔ、塗
料搬送管路１４を介して粉体塗料容器ｌｌＫ接続されて
いる。Reference numeral 8 denotes a spray can that sprays the charged powder coating material 9 toward the surface of the object to be coated.
is connected to. Further, this spray gun 8i1t is connected to a powder paint container 11K via a paint conveying pipe 14.
なお図において、１３は電源装置２をスプレーガン８に
接続する導体、１５は、複数の塗着粉体層１５ａ−１５
ｄからなる厚膜である。In the figure, 13 is a conductor connecting the power supply device 2 to the spray gun 8, and 15 is a plurality of coated powder layers 15a-15.
It is a thick film consisting of d.
スイッチ５を接点６に接続して、スプレーガン８に正の
高電圧を印加し粉体塗料容器１１からスプレーガン８に
供給される粉体塗料、例えば粉末状のエポキシ、ポリエ
チレン・ナイロンなどを正極性に帯電させて被塗物ｌの
表面に吹き付ける。Connect the switch 5 to the contact 6 and apply a positive high voltage to the spray gun 8 to apply the powder paint supplied from the powder paint container 11 to the spray gun 8, such as powdered epoxy, polyethylene, nylon, etc., to the positive electrode. It is electrically charged and sprayed onto the surface of the object to be coated.
被塗物の表面に塗着された粉体塗料層の厚みは、ある一
定の値をこすことができず、これを限限界層厚という。The thickness of the powder coating layer applied to the surface of the object cannot exceed a certain value, which is called the critical layer thickness.
これは、主に粉体の粒度とスプレーガンに印加された電
圧によって被塗物の表面附近に形成される電界強度によ
って決定される。This is mainly determined by the particle size of the powder and the electric field strength formed near the surface of the object to be coated due to the voltage applied to the spray gun.
次＃′２：スイ、チ５を切り換え接点７に接続し。Next #'2: Switch switch and connect switch 5 to contact 7.
スプレーガン８に負の高電圧を印加し、供給される粉体
塗料に負の帯電を行いつつ、さきに塗着されている正電
荷を有する塗着粉体層のうえに重ねて塗着をおこなう。A negative high voltage is applied to the spray gun 8 to negatively charge the supplied powder coating, and the coating is applied over the previously applied coating powder layer with a positive charge. Let's do it.
この時被塗物ｌの表面の粉体層は、正に帯電しているの
で、負に帯電した粉体塗料９ｔ−１，前記正電荷によっ
て吸引され、粉体塗料層１５ａ上に付着し、粉体塗料層
１５ｂを形成する。At this time, since the powder layer on the surface of the object to be coated l is positively charged, the negatively charged powder coating material 9t-1 is attracted by the positive charge and adheres to the powder coating layer 15a. A powder coating layer 15b is formed.
この粉体塗料層１５ｂの有する負電荷は、被塗物表面上
にさきく形成されて込る粉体層の有 １する正電
荷を中和するので、ぬシ重ねが可能となり、どちらか一
方の極性のみで粉体塗着をする場合よりはるかに厚い塗
着粉体層を得ることができる。The negative charge of this powder coating layer 15b neutralizes the positive charge of the powder layer that is quickly formed on the surface of the object to be coated. A much thicker coated powder layer can be obtained than when powder coating is performed using polarity alone.
更に、前述の要領にて正電荷の荷電粉体塗料９による粉
体塗料層ｔＳＣ，負電荷の帯電粉体塗料９による粉体塗
料層１５ｄをつくり、厚膜１５を形成する。Furthermore, a powder coating layer tSC of the positively charged powder coating material 9 and a powder coating layer 15d of the negatively charged powder coating material 9 are created in the manner described above to form the thick film 15.
粉体塗料層１５ｂの厚さ１．と、粉体塗料層１５Ｃの厚
さｔ３および粉体塗料層１５ｄの厚さｔ、は、粉体塗料
層１５ａの厚さｔｌ より薄くする方が、よい結果が
得られる。Thickness of powder coating layer 15b: 1. Better results can be obtained by making the thickness t3 of the powder coating layer 15C and the thickness t of the powder coating layer 15d thinner than the thickness tl of the powder coating layer 15a.
なお、厚膜１５を形成した被塗物ｌけ、図示しない焼付
装置に運ばれ、焼付けが行なわれる。The object to be coated on which the thick film 15 has been formed is transported to a baking device (not shown) and baked.
発明の効果
本発明は、以上のように被塗物の表面に粉体塗料層を、
その極性を交互に変えて複数回静電付着し複数の粉体塗
料層からなる厚膜を形成するので、大きな膜厚を得るこ
とができる。Effects of the Invention As described above, the present invention applies a powder coating layer to the surface of an object to be coated.
Since the powder coating layer is electrostatically deposited multiple times with alternating polarity to form a thick film consisting of a plurality of powder coating layers, a large film thickness can be obtained.
又、初回に静電付着する粉体塗料層の厚さを、他の回の
それよりも厚く形成し１次回以降は、それよりうすい層
厚で塗着をおこなうことにより全体として均一性のよい
平滑で高性能な塗膜を得ることができる。In addition, the thickness of the powder coating layer that is electrostatically deposited the first time is thicker than that of the other times, and from the first time onward, the coating is performed with a thinner layer thickness, thereby achieving good overall uniformity. A smooth, high-performance coating film can be obtained.
特に最終回に静電塗着する粉体塗料層の極性を負極性に
した場合、表面が平滑で膜厚の均一性のよい高性能な塗
膜が得られることが判明した。In particular, it has been found that when the polarity of the powder coating layer electrostatically applied in the final step is negative, a high-performance coating film with a smooth surface and a uniform thickness can be obtained.
第１図は、本発明の実施例を示す縦断面図の一部を示す
拡大図、第２図は、本発明を実施するための装置を示す
図である。
ｌ・・・被塗物
１５ａ−１５ｄ・・・粉体塗料層
ｔ１〜ｔ、・・・粉体塗料層の厚さ
代 理 人 弁理士 斎 藤 侑（外２名）FIG. 1 is an enlarged view of a part of a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a diagram showing an apparatus for carrying out the present invention. l...Objects to be coated 15a-15d...Powder coating layers t1 to t,...Thickness of the powder coating layer Representative Patent attorney Yu Saifuji (two others)
Claims (1)
複数回静電塗着し、該複数回の静電塗着のうち最終回に
静電塗着する粉体塗料層の極性を負極性にすると共に、
初回に静電塗着する粉体塗料層の厚さを、他の回のそれ
よりも厚く形成することを特徴とする静電粉体塗装方法
。A powder coating layer is electrostatically coated on the surface of an object to be coated multiple times with alternating polarity, and the powder coating layer is electrostatically coated in the last of the multiple electrostatic coatings. Along with making the polarity negative,
An electrostatic powder coating method characterized by forming a powder coating layer that is electrostatically applied the first time thicker than that in other times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27642984A JPS61157381A (en) | 1984-12-28 | 1984-12-28 | Electrostatic powder painting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27642984A JPS61157381A (en) | 1984-12-28 | 1984-12-28 | Electrostatic powder painting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61157381A true JPS61157381A (en) | 1986-07-17 |
Family
ID=17569286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27642984A Pending JPS61157381A (en) | 1984-12-28 | 1984-12-28 | Electrostatic powder painting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61157381A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5298040A (en) * | 1976-02-13 | 1977-08-17 | Kansai Paint Co Ltd | Method of electrostatically applying powder paint |
-
1984
- 1984-12-28 JP JP27642984A patent/JPS61157381A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5298040A (en) * | 1976-02-13 | 1977-08-17 | Kansai Paint Co Ltd | Method of electrostatically applying powder paint |
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