JP3629054B2 - Surface correction coating method for welded can side seam - Google Patents

Surface correction coating method for welded can side seam Download PDF

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Publication number
JP3629054B2
JP3629054B2 JP31981394A JP31981394A JP3629054B2 JP 3629054 B2 JP3629054 B2 JP 3629054B2 JP 31981394 A JP31981394 A JP 31981394A JP 31981394 A JP31981394 A JP 31981394A JP 3629054 B2 JP3629054 B2 JP 3629054B2
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Japan
Prior art keywords
paint
correction
side seam
air
welded
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JP31981394A
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JPH08173890A (en
Inventor
正幸 阿部
智樹 近藤
明 高松
隆一 内田
弘 須永
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HOKKAICAN CO.,LTD.
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HOKKAICAN CO.,LTD.
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Description

【０００１】
【産業上の利用分野】
本発明は、飲料缶等に用いられる溶接缶のサイドシームの外面を塗装により補正する方法に関する。
【０００２】
【従来の技術】
清涼飲料等の包装用缶としては近年溶接缶が多く用いられているが、溶接缶の接合部であるサイドシームには金属露出部があり、防錆、防食、美観等の点から塗料を塗布して補正することが行われている。一方、前記サイドシームの溶接部には段差があるため一般の塗装では金属露出部が残存することがあり、この部分から錆が発生して美観が損なわれる等の問題が生じる。そのため、塗料を多めにして補正することが行われているが、通常前記サイドシームを上面にして前記缶胴を搬送しているので、塗料が前記缶胴の周方向のサイドシーム以外の箇所に流出して塗料が無駄になるという不都合がある。
【０００３】
また、通常缶体の製造業者は、缶体に起因する何らかの不具合が発生したときにその原因の究明や製品の回収等をするために、缶体の製造年月日や製造ライン等のコードマークを缶体に表示している。例えば、従来例として特開平６−１５６５０３号公報においてコードマークをサイドシームの金属露出面に印刷することが提案されている。しかし、金属露出面にコードマークを印刷し、その後にサイドシームの補正を行うとコードマークのインクの上に補正塗料を塗布することになり塗料とサイドシームの密着が悪くなるため、レトルト殺菌やその後の冷却等の過酷な熱履歴によっては補正塗料が剥離してこの剥離した箇所から錆が発生するという不都合がある。
【０００４】
【発明が解決しようとする課題】
本発明は、溶接缶のサイドシームの外面の補正塗装方法の改良を目的とし、更に詳しくは補正塗料が少なくても確実に補正ができ、サイドシーム部にコードマークを印刷しても補正した塗料が剥離しないサイドシームの外面補正塗装方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
前記目的を達成するために、本発明の溶接缶サイドシームの外面補正塗装方法は、缶胴ブランクを溶接して缶胴を形成し、前記缶胴を軸方向に搬送しながら前記缶胴の溶接部外面に補正塗料を塗布する溶接缶サイドシームの外面補正塗装方法において、前記缶胴を搬送する途中で前記補正塗料を塗布した後、前記缶胴の搬送の上流で前記缶胴の周方向の一方から空気を吐出した後に下流で前記上流とは反対方向から空気を吐出することにより前記缶胴の周方向の両側から前記塗布された塗料に空気を吐出し、前記補正塗料が前記缶胴の周方向へ流出することを防止して前記補正塗料を乾燥させることを特徴とする。
【０００７】
また、前記補正塗料の乾燥の後、前記サイドシームの塗装面に前記缶胴の製造に関するコードマークを印刷してもよい。
【０００８】
【作用】
本発明の溶接缶サイドシームの外面補正塗装方法によれば、前記補正塗料を塗布した後に前記缶胴の周方向の両側から前記塗布された塗料に空気を吐出するので、前記補正塗料が吐出された空気により中央方向に押されるのでサイドシームから塗料が周方向に流出しない。
【０００９】
また、前記補正塗料の乾燥を前記缶胴の搬送の上流で一方から空気を吐出した後に下流で前記上流とは反対方向から空気を吐出することにより行うため、上流と下流で吐出された空気が互いに干渉しない。
【００１０】
また、前記補正塗料の乾燥の後、前記サイドシームの塗装面に前記缶胴の製造に関するコードマークを印刷したときは、補正塗料と金属部分の間にコードマークのインクを介することなく金属露出部分に補正塗料が直接塗布される。
【００１１】
【実施例】
次に、添付の図面を参照しながら本発明の溶接缶サイドシームの外面補正塗装方法の実施例について説明する。図１は本実施例における補正塗料の塗布及びその乾燥の状態を示す説明的平面図、図２は図１のＩＩ−ＩＩ断面図、図３は図１のＩＩＩ−ＩＩＩ断面図、図４は図１のＩＶ−ＩＶ断面図、図５は図１のＶ−Ｖ断面図である。
【００１２】
先ず、本実施例における各部の構成について説明する。本実施例では、缶胴１は溶接缶であり、この缶胴１のサイドシーム２に補正塗料４を塗布するアウトサイドシームストライプガン（以下ＯＳＳガンと省略する）３を缶胴１の搬送路上に配設し、このＯＳＳガン３から約１０ｃｍの距離をおいて缶胴１の進行方向の下流に缶胴１の周方向の一方から空気６を吐出する第１エアノズル５を配設し、その下流に第１エアノズル５とは反対方向から空気８を吐出する第２エアノズル７を配設し、その下流にインク１０を吐出して缶胴１の製造履歴等を表示するコードマーク印刷するインクジェットプリンタヘッド９を配設している。
【００１３】
缶胴１は錫めっき鋼板又は錫ニッケルめっき鋼板製で、サイドシーム２以外の外面は内容物を表示するための印刷が施されており、サイドシーム２は金属面が露出している。塗料４には一般にエポキシ樹脂系塗料が多く用いられており、本実施例ではエポキシ・尿素系樹脂を用いている。その粘度はＮｏ．４フォードカップ、２５°Ｃで１５秒であり、加熱残分はサンプル１．０ｇ当たり１６０°Ｃ−３０分で２０％であり、比重は２０°Ｃで０．９３６であり、乾燥塗膜量は４０〜６０ｍｇ／１００ｃｍ２ である。第１エアノズル５及び第２エアノズル７は、図１に示すように缶胴１の進行方向に向かって幅広く形成し、０．１Ｋｇ／ｃｍ２ の圧力で空気６，８を吐出している。また、空気６，８を図３及び図４に示すように水平方向に角度αをつけて吐出しており、本実施例では２０°である。角度αはあまり角度をつけすぎると塗料４が逆に周方向に流出してしまい、あまり角度をつけないと塗料４を押しながらその表面を乾燥するのに適さないため、１０°〜３０°が好ましい。また、第１エアノズル５及び第２エアノズル７を缶胴１の進行方向に互いにオフセットして配設し空気６と空気８が互いに干渉しないようにしている。また、本実施例では空気６，８にホットエアを用いている。
【００１４】
また、インクジェットプリンタヘッド９は、その先端をサイドシーム２が通過する軌道の約１０ｍｍ上方に配設し、サイドシーム２の表面に塗装された塗料４の表面にインク１０を吐出できるようにしている。インク１０はメチルエチルケトン，メタノール，樹脂及び染料からなるものを使用している。
【００１５】
次に、本実施例の方法について説明する。先ず、図示しない溶接装置により溶接された缶胴１は、図示しない搬送装置により図１の矢印の示す方向に搬送される。次に、ＯＳＳガン３により塗料４をサイドシーム２の外面に吐出し、金属露出面を全て塗料４で覆う。このとき、塗料４は上述の如く加熱残分が２０％であり８０％が溶剤なので、図２に示すように缶胴１の周方向に流動して集まっておりその表面は乾燥していない。
【００１６】
次に第１エアノズル５により空気６を吐出する。この空気６により塗料４は図３に示すように第１エアノズル５の反対側に押され、同時に第１エアノズル５側の塗料は塗料４の境界線から徐々に乾燥していく。また、本実施例では、図３に示すようにサイドシームの溶接部の缶胴ブランクの端部が外側に重なっている方向から空気６を吐出するようにしている。これは、この反対方向から先に空気を吐出するとサイドシーム２の溶接部の段差の角部２ａの塗料が薄くなってしまうおそれがあるためである。
【００１７】
次に第２エアノズル７により第１エアノズル５とは反対側から空気８を吐出する。この空気８により塗料４は図４に示すように第２エアノズル７とは反対側に押されるが、第１エアノズル５側の塗料４は乾燥途中なのでサイドシーム２の周方向の中心付近に塗料４が集まり、塗料４の全体が乾燥していく。塗料４の全体が乾燥すると、図５に示すようにサイドシーム２の周方向の中心付近がやや厚めに塗装されるので、サイドシーム２の溶接部の段差は塗料４によって十分に被覆される。
【００１８】
次に、図５に示すように、インクジェットプリンタヘッド９によりインク１０を吐出して缶胴１の製造履歴を表示するコードマークを乾燥した塗料４の表面に印刷する。このように、コードマークを補正塗装の後に行っているので、塗料４は表面が金属であるサイドシーム２に直接塗布されてサイドシーム２との密着が良くなり、その後のレトルト処理等の過酷な熱履歴によっても塗料４が剥がれることがない。また、本実施例で用いたインク１０で印刷するときは塗料４の残留溶剤が約３０％以下でないとインク１０が塗料４中に拡散してコードマークが不鮮明になる。従って、第２エアノズル７からインクジェットプリンタヘッド９までの距離は塗料４の乾燥速度や搬送速度或いは吐出する空気６，８の温度等を考慮して定める。本実施例では塗料４を塗布した後、第１及び第２エアノズル５，７により空気６，８を吐出して塗料４を乾燥しており、更に空気６，８にはホットエアを用いているので塗料４の乾燥が迅速に行われるため、サイドシームの補正塗装設備にインクジェットプリンタヘッド９を設けることができる。
【００１９】
【発明の効果】
本発明の溶接缶サイドシームの外面補正塗装方法によれば、補正塗料をサイドシームの補正に必要な量だけ吐出するため塗料がが周方向に流出しないので、塗料の使用量を低減することができる。
【００２０】
前記補正塗料の乾燥を前記缶胴の搬送の上流で一方から空気を吐出した後に下流で前記上流とは反対方向から空気を吐出することにより行っているため、上流と下流で吐出された空気が互いに干渉しないので、周方向の両側から同時に空気を吐出したときのように気流が乱れて塗装表面が乱れることがない。
【００２１】
また、前記補正塗料の乾燥の後、前記サイドシームの塗装面に前記缶胴の製造に関するコードマークを印刷したときは、補正塗料と金属部分の間にコードマークのインクを介することなく金属露出部分に補正塗料が直接塗布されるので、補正塗料とサイドシームの密着がよく、その後にレトルト処理等の過酷な熱履歴によっても補正塗料が剥離しない。
【図面の簡単な説明】
【図１】本発明の一実施例における補正塗料の塗布及びその乾燥の状態を示す説明的平面図。
【図２】図１のＩＩ−ＩＩ断面図。
【図３】図１のＩＩＩ−ＩＩＩ断面図。
【図４】図１のＩＶ−ＩＶ断面図。
【図５】図１のＶ−Ｖ断面図。
【符号の説明】
１…缶胴、２…サイドシーム、３…ＯＳＳガン、４…塗料、５…第１エアノズル、６…空気、７…第２エアノズル、８…空気、９…インクジェットプリンタヘッド、１０…インク。[0001]
[Industrial application fields]
The present invention relates to a method for correcting an outer surface of a side seam of a welding can used for a beverage can or the like by painting.
[0002]
[Prior art]
In recent years, welded cans are often used as packaging cans for soft drinks, etc., but the side seams that are welded joints have exposed metal parts, and paints are applied to prevent rust, corrosion, and beauty. It has been corrected. On the other hand, since there is a step in the welded portion of the side seam, a metal exposed portion may remain in general coating, and problems such as rusting from this portion and loss of aesthetics arise. Therefore, correction is made with a larger amount of paint, but since the can body is usually transported with the side seam as the upper surface, the paint is placed in a place other than the side seam in the circumferential direction of the can body. There is an inconvenience that the paint flows out and is wasted.
[0003]
In addition, when a manufacturer of a can body usually finds out the cause of a malfunction caused by the can body and collects the product, the code mark of the production date of the can body, the production line, etc. Is displayed on the can body. For example, as a conventional example, Japanese Patent Laid-Open No. 6-156503 proposes printing a code mark on a metal exposed surface of a side seam. However, if the code mark is printed on the exposed metal surface and then the side seam correction is performed, the correction paint is applied on the ink of the code mark, resulting in poor adhesion between the paint and the side seam. Depending on a severe heat history such as subsequent cooling, there is a disadvantage that the correction paint is peeled off and rust is generated from the peeled off part.
[0004]
[Problems to be solved by the invention]
The present invention aims to improve the correction coating method for the outer surface of the side seam of a welding can. More specifically, the correction can be surely performed even if the correction coating is small, and the coating is corrected even if a code mark is printed on the side seam. An object of the present invention is to provide a side seam outer surface correction coating method that does not peel off.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the outer surface correction coating method of a welded can side seam of the present invention, a can body blank is welded to form a can body, and the can body is welded while transporting the can body in the axial direction. In the outer surface correction coating method of a welded can side seam in which a correction paint is applied to the outer surface of the part, after the correction paint is applied in the course of transporting the can body, the circumferential direction of the can body is upstream of the transport of the can body. After discharging air from one side, air is discharged from both sides in the circumferential direction of the can body by discharging air from the opposite direction to the upstream downstream, and the correction paint is applied to the can body The correction coating material is dried by preventing it from flowing out in the circumferential direction.
[0007]
Further, after the correction paint is dried, a code mark relating to the manufacture of the can body may be printed on the painted surface of the side seam.
[0008]
[Action]
According to the outer surface correction coating method of the welded can side seam of the present invention, after applying the correction paint, air is discharged from both sides in the circumferential direction of the can body to the applied paint, so that the correction paint is discharged. Since the air is pushed toward the center, the paint does not flow out from the side seam in the circumferential direction.
[0009]
Further, the correction paint line by drying and the can body upstream in the upstream downstream after discharging the air from one of the transport of the discharged air from the opposite direction of Utame, air discharged by the upstream and downstream Do not interfere with each other.
[0010]
In addition, when the code mark relating to the manufacture of the can body is printed on the painted surface of the side seam after the correction paint is dried, the exposed metal portion without the code mark ink between the correction paint and the metal portion. The corrective paint is applied directly to.
[0011]
【Example】
Next, an embodiment of the outer surface correction coating method for welded can side seams according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an explanatory plan view showing the state of application of a correction paint and its drying state in this embodiment, FIG. 2 is a sectional view taken along line II-II in FIG. 1, FIG. 3 is a sectional view taken along line III-III in FIG. 1 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 is a sectional view taken along the line V-V in FIG.
[0012]
First, the structure of each part in a present Example is demonstrated. In this embodiment, the can body 1 is a welded can, and an outside seam stripe gun (hereinafter abbreviated as OSS gun) 3 for applying the correction paint 4 to the side seam 2 of the can body 1 is disposed on the conveyance path of the can body 1. A first air nozzle 5 for discharging air 6 from one circumferential direction of the can body 1 at a distance of about 10 cm from the OSS gun 3 and downstream of the traveling direction of the can body 1. An ink jet printer that performs code mark printing that disposes a second air nozzle 7 that discharges air 8 from the opposite direction to the first air nozzle 5 downstream, and that discharges ink 10 downstream thereof to display the manufacturing history of the can body 1. A head 9 is provided.
[0013]
The can body 1 is made of a tin-plated steel plate or a tin-nickel plated steel plate, and the outer surface other than the side seam 2 is printed to display the contents, and the side seam 2 has a metal surface exposed. In general, an epoxy resin-based paint is often used as the paint 4, and an epoxy / urea-based resin is used in this embodiment. Its viscosity is no. 4 Ford cup, 15 seconds at 25 ° C, heating residue is 20% at 160 ° C-30 minutes per 1.0 g of sample, specific gravity is 0.936 at 20 ° C, dry coating weight Is 40-60 mg / 100 cm 2 . As shown in FIG. 1, the first air nozzle 5 and the second air nozzle 7 are formed wide toward the traveling direction of the can body 1 and discharge air 6 and 8 at a pressure of 0.1 kg / cm 2 . Air 6 and 8 are discharged at an angle α in the horizontal direction as shown in FIGS. 3 and 4 and is 20 ° in this embodiment. If the angle α is too large, the paint 4 will flow out in the circumferential direction. If the angle α is not too large, it is not suitable for drying the surface while pushing the paint 4, so that the angle is 10 ° to 30 °. preferable. Further, the first air nozzle 5 and the second air nozzle 7 are arranged offset from each other in the traveling direction of the can body 1 so that the air 6 and the air 8 do not interfere with each other. In this embodiment, hot air is used for the airs 6 and 8.
[0014]
Further, the inkjet printer head 9 has a tip disposed approximately 10 mm above the trajectory through which the side seam 2 passes so that the ink 10 can be ejected onto the surface of the paint 4 painted on the surface of the side seam 2. . The ink 10 is made of methyl ethyl ketone, methanol, resin and dye.
[0015]
Next, the method of the present embodiment will be described. First, the can body 1 welded by a welding device (not shown) is transported in a direction indicated by an arrow in FIG. 1 by a transport device (not shown). Next, the paint 4 is discharged to the outer surface of the side seam 2 by the OSS gun 3, and the metal exposed surface is covered with the paint 4. At this time, as described above, since the heating residue is 20% and 80% is the solvent, the paint 4 flows and gathers in the circumferential direction of the can body 1 as shown in FIG. 2, and its surface is not dried.
[0016]
Next, air 6 is discharged from the first air nozzle 5. As shown in FIG. 3, the paint 4 is pushed to the opposite side of the first air nozzle 5 by the air 6, and at the same time, the paint on the first air nozzle 5 side is gradually dried from the boundary line of the paint 4. Further, in this embodiment, as shown in FIG. 3, the air 6 is discharged from the direction in which the end portion of the can body blank of the welded portion of the side seam overlaps the outside. This is because if the air is discharged first from the opposite direction, the paint on the corner 2a of the step of the welded portion of the side seam 2 may become thin.
[0017]
Next, air 8 is discharged from the opposite side of the first air nozzle 5 by the second air nozzle 7. As shown in FIG. 4, the paint 4 is pushed to the opposite side of the second air nozzle 7 by the air 8, but the paint 4 on the first air nozzle 5 side is in the middle of drying, so the paint 4 is near the center in the circumferential direction of the side seam 2. Collect and the entire paint 4 is dried. When the entire paint 4 is dried, as shown in FIG. 5, since the vicinity of the center in the circumferential direction of the side seam 2 is slightly thickened, the step of the welded portion of the side seam 2 is sufficiently covered with the paint 4.
[0018]
Next, as shown in FIG. 5, the ink mark 10 is ejected by the ink jet printer head 9, and the code mark that displays the manufacturing history of the can body 1 is printed on the surface of the dried paint 4. As described above, since the code mark is applied after the correction coating, the coating 4 is directly applied to the side seam 2 whose surface is metal, and the close contact with the side seam 2 is improved. The paint 4 does not peel off due to the heat history. When printing with the ink 10 used in this embodiment, if the residual solvent of the paint 4 is not about 30% or less, the ink 10 diffuses into the paint 4 and the code mark becomes unclear. Accordingly, the distance from the second air nozzle 7 to the ink jet printer head 9 is determined in consideration of the drying speed and transport speed of the paint 4 or the temperature of the air 6 and 8 to be discharged. In this embodiment, after the coating material 4 is applied, the air 6 and 8 are discharged by the first and second air nozzles 5 and 7 to dry the coating material 4, and hot air is used for the air 6 and 8. Since the coating material 4 is quickly dried, the ink jet printer head 9 can be provided in the side seam correction coating facility.
[0019]
【The invention's effect】
According to the outer surface correction coating method for a welded can side seam of the present invention, since the coating material is discharged in an amount necessary for correcting the side seam, the coating material does not flow out in the circumferential direction. it can.
[0020]
Because doing by discharging air from the opposite direction to the upstream downstream after discharging the air from one drying of the correction paint upstream of the conveyance of the can body, the air discharged by the upstream and downstream Since they do not interfere with each other, the air flow is disturbed and the coating surface is not disturbed as when air is simultaneously discharged from both sides in the circumferential direction.
[0021]
In addition, when the code mark relating to the manufacture of the can body is printed on the painted surface of the side seam after the correction paint is dried, the exposed metal portion without the code mark ink between the correction paint and the metal portion. Since the correction coating is directly applied to the surface, the correction coating and the side seam are in close contact with each other, and the correction coating is not peeled off even by a severe heat history such as a retort treatment.
[Brief description of the drawings]
FIG. 1 is an explanatory plan view showing a state of application of a correction paint and its drying state in one embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
3 is a cross-sectional view taken along the line III-III in FIG.
4 is a cross-sectional view taken along the line IV-IV in FIG.
5 is a cross-sectional view taken along the line VV in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Can body, 2 ... Side seam, 3 ... OSS gun, 4 ... Paint, 5 ... 1st air nozzle, 6 ... Air, 7 ... 2nd air nozzle, 8 ... Air, 9 ... Inkjet printer head, 10 ... Ink.

Claims (2)

缶胴ブランクを溶接して缶胴を形成し、前記缶胴を軸方向に搬送しながら前記缶胴の溶接部外面に補正塗料を塗布する溶接缶サイドシームの外面補正塗装方法において、
前記缶胴を搬送する途中で前記補正塗料を塗布した後、前記缶胴の搬送の上流で前記缶胴の周方向の一方から空気を吐出した後に下流で前記上流とは反対方向から空気を吐出することにより前記缶胴の周方向の両側から前記塗布された塗料に空気を吐出し、
前記補正塗料が前記缶胴の周方向へ流出することを防止して前記補正塗料を乾燥させることを特徴とする溶接缶サイドシームの外面補正塗装方法。In the outer surface correction coating method of a welded can side seam that forms a can body by welding a can body blank, and applies a correction paint to the outer surface of the welded portion of the can body while conveying the can body in the axial direction.
After applying the correction paint in the middle of transporting the can body, the air is discharged from one of the circumferential directions of the can body upstream of the transport of the can body, and then the air is discharged downstream from the opposite direction to the upstream. By discharging air to the applied paint from both sides in the circumferential direction of the can body,
An outer surface correction coating method for a welding can side seam, wherein the correction coating is prevented from flowing out in a circumferential direction of the can body and the correction coating is dried. 前記補正塗料の乾燥の後、前記サイドシームの塗装面に前記缶胴の製造に関するコードマークを印刷することを特徴とする請求項１に記載の溶接缶サイドシームの外面補正塗装方法。Wherein after drying of the correction paint, an outer surface correction method for coating a welded can side seam according to claim 1, characterized in that to print the code marks related to the production of the can body painted surfaces of the side seams.
JP31981394A 1994-12-22 1994-12-22 Surface correction coating method for welded can side seam Expired - Fee Related JP3629054B2 (en)

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