JPH027709B2 - - Google Patents
Info
- Publication number
- JPH027709B2 JPH027709B2 JP6953485A JP6953485A JPH027709B2 JP H027709 B2 JPH027709 B2 JP H027709B2 JP 6953485 A JP6953485 A JP 6953485A JP 6953485 A JP6953485 A JP 6953485A JP H027709 B2 JPH027709 B2 JP H027709B2
- Authority
- JP
- Japan
- Prior art keywords
- coating
- powder
- drum
- electrostatic
- resin
- 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.)
- Expired
Links
- 239000011248 coating agent Substances 0.000 claims description 30
- 238000000576 coating method Methods 0.000 claims description 30
- 239000000843 powder Substances 0.000 claims description 27
- 239000003973 paint Substances 0.000 claims description 15
- 238000009503 electrostatic coating Methods 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 229920013716 polyethylene resin Polymers 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 229920003002 synthetic resin Polymers 0.000 description 5
- 239000000057 synthetic resin Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006334 epoxy coating Polymers 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000007610 electrostatic coating method Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はドラム罐、ペール罐等の罐に於てその
巻き締め部分をも含めて内面に合成樹脂膜を静電
塗装法にてコーテイングする方法に関するもので
ある。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method for coating the inner surface of cans such as drum cans and pail cans, including the seamed parts, with a synthetic resin film by electrostatic coating. It is something.
従来の技術とその問題点
定量の物品を充填して保管あるいは輸送するた
めオープンドラム罐、ペール罐等の空器が使用さ
れる。しかしこの罐は鉄製であるため薬剤、化学
品等の物品の粉体、流体等を直接充填すると発錆
したり酸性物品の場合罐にピンホールその他が生
じる欠点がある。また金属に直接接触すると化学
品が変質する場合もある。この欠点を防止するた
めポリエチレン等充填物の性質に対応した性質を
有する合成樹脂製の内袋を罐内に挿入したりある
いは罐内面にエポキシ樹脂にてコーテイングした
りしている。しかし内袋使用の場参、内袋を罐内
に挿入する手数を要すると共に袋が破損する虞れ
があり、エポキシのコーテイングでは材質が硬く
脆いため一度使用した後はピンホールが生じ再使
用は不可能であると共にエポキシコーテイングは
新罐にのみ適用され再生罐には不向きになる故、
高価となる欠点がある。これを改善するため罐内
面にポリエチレン樹脂粉末を静電塗装し、その後
加熱炉で溶融せしめてコーテイング膜を得る方法
が特公昭59−26354号公報にて提案されている。
しかし該方法はドラム罐の巻き締め部分にも完全
にコーテイング膜を形成するためこの罐の巻き締
め部に最初に溶融点の低い樹脂を塗装し、次にこ
れよりも溶融点の高いポリエチレン樹脂を静電塗
装しその後加熱処理するものである。従つて異な
る二種の合成樹脂材を用いる不便さがある。Prior art and its problems Empty containers such as open drum cans and pail cans are used to store or transport a fixed amount of goods. However, since these cans are made of iron, they have the drawback that if they are directly filled with powders or fluids of medicines, chemicals, etc., they will rust, or in the case of acidic products, pinholes or other problems will form in the can. Also, direct contact with metals may cause the chemical to deteriorate. In order to prevent this drawback, an inner bag made of a synthetic resin such as polyethylene having properties corresponding to the properties of the filling material is inserted into the can, or the inner surface of the can is coated with epoxy resin. However, when using an inner bag, it takes time to insert the inner bag into the can, and there is a risk of the bag being damaged.Epoxy coating is hard and brittle, so pinholes form after one use, making it impossible to reuse it. Not only is it impossible, but epoxy coating is only applicable to new cans and is not suitable for recycled cans.
It has the disadvantage of being expensive. To improve this, Japanese Patent Publication No. 59-26354 proposes a method of electrostatically coating the inner surface of the can with polyethylene resin powder and then melting it in a heating furnace to obtain a coating film.
However, in this method, in order to completely form a coating film even on the tightened portion of the drum can, the tightened portion of the can is first coated with a resin with a low melting point, and then a polyethylene resin with a higher melting point is applied. It is electrostatically painted and then heat treated. Therefore, there is the inconvenience of using two different types of synthetic resin materials.
問題点の解決手段
本発明は上述の欠点に鑑み、同種の合成樹脂粉
末材を用い、罐の巻き締め部分をも含めて罐内面
全体を均一な厚さの合成樹脂膜を形成せしめんと
したものでオープンドラム罐、ペール罐等のその
内面を樹脂コーテイングするに相応しい状態と
し、この罐の巻き締め部分にポリエチレン樹脂粉
末を静電塗装法によつて塗装し、次に前記ポリエ
チレン樹脂粉末をしかも静電塗装限界以上の粉末
量を罐内周面に対し所要角度を有するノズルにて
噴射し、巻き締め部分を含め罐内周面全体に亘つ
て塗装すると共に前記静電粉末塗装限界を越えた
余剰の粉末を罐内底面に附着するようにして罐内
周面及び内底面に塗装後、該罐を粉末塗料に含有
される空気又は/あるいは巻き締め部分の空気が
塗料溶融時気泡となつてピンホールが生じない程
度に加熱処理して前記粉末塗料を溶融し、罐内周
面全体に附着せしめ樹脂コーテイングをすること
を特徴とする。Means for Solving Problems In view of the above-mentioned drawbacks, the present invention aims to form a synthetic resin film of uniform thickness on the entire inner surface of the can, including the seamed portion, by using the same type of synthetic resin powder material. The inner surfaces of open drum cans, pail cans, etc. are brought into a state suitable for resin coating, and the tightened portion of the can is coated with polyethylene resin powder using an electrostatic coating method. The amount of powder exceeding the electrostatic coating limit was sprayed with a nozzle having the required angle to the inner circumferential surface of the can, and the entire inner circumferential surface of the can, including the tightened part, was coated, and the electrostatic powder coating limit was exceeded. After coating the inner circumferential surface and inner bottom of the can so that the excess powder adheres to the bottom of the can, the can is heated so that the air contained in the powder coating and/or the air in the tightened portion becomes bubbles when the paint melts. The powder coating is melted by heat treatment to such an extent that no pinholes are formed, and is applied to the entire inner peripheral surface of the can to form a resin coating.
実施例
以下本発明を実施例にもとづいて説明する。本
発明に適用される罐はオープンドラム罐、ペール
罐の他に少くとも片方が開口した罐ならば限定さ
れることはなく、また新罐、再生罐をも限定され
るものではない。実施例では少くとも1回使用さ
れた再生罐所謂古罐について説明する。EXAMPLES The present invention will be described below based on examples. Cans applied to the present invention are not limited to open drum cans, pail cans, or any can with at least one side open, and are not limited to new cans or recycled cans. In the embodiment, a recycled can that has been used at least once will be described.
回収されたオープンドラム罐1はまず洗浄工程
で罐内周面、外周面を洗浄し附着物を除去する。
これは水又は洗浄液で洗浄したり、あるいは附着
物を焼却したりする方法が含まれる。さらに必要
に応じて整形したり、シヨツトプラストにて研磨
したりさらにはピンホール有無の検査をしたりす
る。 First, the recovered open drum can 1 undergoes a cleaning process in which the inner circumferential surface and outer circumferential surface of the can are cleaned to remove any adhering substances.
This includes cleaning with water or cleaning fluids, or incinerating the deposits. Furthermore, if necessary, it is shaped, polished with shotplast, and inspected for the presence of pinholes.
このようにして再生使用可能なオープンドラム
罐1は少なくともその内周面、内底面を樹脂コー
テイングするに適した状態とし、これをまずポリ
エチレン樹脂粉末をオープンドラム罐の内底周面
部即ち巻き締め部分2に静電粉末塗装用ガンにて
塗装8する。 In this way, the recyclable open drum can 1 is brought into a state suitable for resin coating at least its inner peripheral surface and inner bottom surface, and polyethylene resin powder is first applied to the inner bottom peripheral surface of the open drum can, that is, the tightened portion. 2. Paint 8 using an electrostatic powder coating gun.
この時作業者が上記ガンをもつてドラム罐内の
巻き締め部分に略均一に塗装してもよいし、ある
いはドラム罐の巻き締め部分に向つてガンを対峙
し、ドラム罐側を回動させてもよい。 At this time, the operator may hold the gun and apply the coating almost uniformly to the tightened part of the drum can, or the worker may face the gun towards the tightened part of the drum can and rotate the drum can side. It's okay.
次に前工程で巻き締め部分に塗装3した同じポ
リエチレン樹脂粉末をドラム罐の内周面に対しあ
る角度で対峙せしめた静電塗装用ガン4にて噴射
し静電塗装5を行なうが、このガン4はドラム罐
内底部よりドラム罐開口部に向つてゆつくりと上
昇させつつドラム罐側を回動させる。勿論この時
ガン4よりポリエチレン樹脂粉末が噴射され、静
電塗装が行なわれる。しかし静電粉末塗装に於て
はその被膜厚は300ミクロンが限界である。本発
明ではこの静電粉末塗装の限界を越えた粉末塗料
を噴射せしめるものである。 Next, electrostatic coating 5 is performed by spraying the same polyethylene resin powder that was coated 3 on the tightened portion in the previous process using an electrostatic coating gun 4 that is opposed to the inner peripheral surface of the drum can at a certain angle. The gun 4 is slowly raised from the inner bottom of the drum can toward the opening of the drum can while rotating the drum can side. Of course, at this time, polyethylene resin powder is injected from the gun 4 to perform electrostatic coating. However, in electrostatic powder coating, the maximum film thickness is 300 microns. In the present invention, a powder coating material that exceeds the limits of electrostatic powder coating is sprayed.
これにより塗料はガンの上昇によつてドラム罐
内周面に限界内即ち300ミクロン厚で塗装される
がこの限界を越えた余剰の塗料は落下し末塗装の
ドラム罐内底面に附着するものである。 As a result, as the gun moves up, the paint is applied to the inner peripheral surface of the drum can within the limit, that is, at a thickness of 300 microns, but the excess paint that exceeds this limit falls and adheres to the unpainted inner bottom of the drum can. be.
従つてガン4より噴射される粉末塗料の量はド
ラム罐の回転速度とガン上昇速度にて塗料がドラ
ム罐内周面に300ミクロン厚にて附着しかつガン
がドラム罐開口端の最上昇点まで移動する間に余
剰となる塗料の全量がドラム罐内底面全体に略
300ミクロン厚に塗装されるようにして定めれば
経済的である。 Therefore, the amount of powder paint injected from the gun 4 is determined by the rotational speed of the drum can and the rising speed of the gun so that the paint adheres to the inner peripheral surface of the drum can at a thickness of 300 microns and the gun reaches the highest point at the opening end of the drum can. The entire amount of excess paint is spread over the entire bottom of the drum can.
It is economical if the coating is determined to be 300 microns thick.
このように内周面、内底面に静電塗装をしたド
ラム罐を次に加熱炉へ入れる。この時炉内へ入つ
た時点では粉体塗料は静電作用にてドラム罐に附
着しているにすぎないため、この塗料が吹き飛ば
されないようにして加熱する必要がある。そして
最終的に該塗料がドラム罐に静電附着した状態で
溶融し、確実に樹脂コーテイングを行なうように
なす。そしてこの加熱処理時巻き締め部分に封入
されている空気、又は/あるいは粉末塗料中に含
有される空気が塗料の溶融によつて気泡となつて
抜け出る直前もしくはそれよりも前に加熱を停止
するよう加熱時間を調整するものである。 The drum can whose inner peripheral surface and inner bottom surface have been electrostatically coated in this manner is then placed into a heating furnace. At this time, when the powder paint enters the furnace, it is merely attached to the drum can due to electrostatic action, so it is necessary to heat the paint in a manner that prevents it from being blown away. Finally, the paint is electrostatically adhered to the drum can and melted to ensure resin coating. During this heat treatment, the heating is stopped just before or before the air sealed in the seamed part and/or the air contained in the powder paint melts and escapes as bubbles. This is to adjust the heating time.
ドラム罐内に樹脂コーテイングする目的はドラ
ム罐に収容される物品が直接金属製のドラム罐に
接触しないようにすることである。樹脂コーテイ
ングに脱気等によりピンホールが生じると、この
樹脂コーテイングのピンホールより収容物がドラ
ム罐の金属部分に接触し罐を腐蝕せしめたり、収
容物に変質をきたしたりするが、気泡が樹脂コー
テイング内に封止されていてもコーテイング表面
にピンホールがなく完全に金属面が被覆されてお
ればその目的を充分に達成することができるもの
である。 The purpose of coating the drum can with resin is to prevent the articles contained in the drum can from coming into direct contact with the metal drum can. If pinholes are formed in the resin coating due to degassing, etc., the contents may come into contact with the metal parts of the drum can through the pinholes, corroding the can or causing deterioration of the contents; Even if the metal surface is sealed within the coating, the purpose can be fully achieved as long as there are no pinholes on the surface of the coating and the metal surface is completely covered.
発明の効果
本発明による時は同じ塗料を用いてドラム罐内
周面及び巻き締め部分を静電塗装をするようにな
しているため方法が簡単でしかも粉末塗料を経済
的に用いて最大の効果を得ることができる利点が
ある。また本発明の方法は新罐、再生罐に関係な
く適用できる利点がある。Effects of the Invention According to the present invention, the inner circumferential surface of the drum can and the tightening part are electrostatically coated using the same paint, so the method is simple, and the powder paint is used economically to maximize the effect. There is an advantage that you can get Further, the method of the present invention has the advantage that it can be applied regardless of whether it is a new can or a recycled can.
第1図はオープンドラム罐の断面的、第2図は
巻き締め部分に静電塗装を施した状態の拡大断面
図、第3図は罐内面を静電塗装する説明図、第4
図はコーテイング後の拡大断面説明図である。
1はドラム罐、2は巻き締め部分、3は1回目
の静電塗装、4はガン、5は2回目の静電塗装。
Figure 1 is a cross-sectional view of the open drum can, Figure 2 is an enlarged cross-sectional view of the sealed portion with electrostatic coating, Figure 3 is an explanatory diagram of electrostatic coating on the inner surface of the can, and Figure 4
The figure is an enlarged cross-sectional explanatory view after coating. 1 is the drum can, 2 is the tightening part, 3 is the first electrostatic coating, 4 is the gun, and 5 is the second electrostatic coating.
Claims (1)
樹脂コーテイングするに相応しい状態とし、この
罐の巻き締め部分にポリエチレン樹脂粉末を静電
塗装法によつて塗装し次に前記ポリエチレン樹脂
粉末をしかも静電塗装限界以上の粉末量を罐内周
面に対し所要角度を有するノズルにて噴射し巻き
締め部分を含め罐内周面全体に亘つて塗装すると
共に前記静電粉末塗装限界を越えた余剰の粉末を
罐内底面に附着するようにして罐内周面及び内底
面に塗装後、該罐を粉末塗料に含有される空気又
は/あるいは巻き締め部分の空気が塗料溶融時気
泡となつてピンホールが生じない程度に加熱処理
して前記粉末塗料を溶融し罐内周面全体に附着せ
しめ樹脂コーテイングをすることを特徴とするド
ラム罐内面に樹脂膜をコーテイングする方法。1. Bring the inner surface of an open drum can, pail can, etc. into a state suitable for resin coating, apply polyethylene resin powder to the wrapped portion of the can by electrostatic coating, and then apply the polyethylene resin powder to the sealed part of the can by electrostatic coating. Spray an amount of powder in excess of the coating limit using a nozzle having a required angle to the inner circumferential surface of the can to coat the entire inner circumferential surface of the can, including the tightened portion, and remove any excess powder that exceeds the electrostatic powder coating limit. After coating the inner periphery and inner bottom of the can by attaching it to the inner bottom of the can, the air contained in the powder paint and/or the air in the tightened part becomes bubbles when the paint melts, causing pinholes. A method for coating an inner surface of a drum can with a resin film, characterized in that the powder coating material is melted by heat treatment to such an extent that no formation occurs, and the resin coating is applied to the entire inner peripheral surface of the can.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6953485A JPS61227875A (en) | 1985-04-01 | 1985-04-01 | Method for coating resinous film on inner surface of drum can |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6953485A JPS61227875A (en) | 1985-04-01 | 1985-04-01 | Method for coating resinous film on inner surface of drum can |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61227875A JPS61227875A (en) | 1986-10-09 |
JPH027709B2 true JPH027709B2 (en) | 1990-02-20 |
Family
ID=13405485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6953485A Granted JPS61227875A (en) | 1985-04-01 | 1985-04-01 | Method for coating resinous film on inner surface of drum can |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61227875A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1256235B (en) * | 1992-12-23 | 1995-11-29 | Himont Inc | PROCESS FOR COATING THE INTERNAL SURFACE OF METAL CONTAINERS WITH POLYOLEFINIC MATERIALS |
JP4721029B2 (en) * | 2001-04-25 | 2011-07-13 | ノードソン株式会社 | Powder coating method for inner surface of bottomed can body |
JP7028850B2 (en) * | 2019-11-20 | 2022-03-02 | 立豊家庭用品(南京)有限公司 | Manufacturing method of enamel container and enamel container |
-
1985
- 1985-04-01 JP JP6953485A patent/JPS61227875A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS61227875A (en) | 1986-10-09 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term |