JPS6126452B2

JPS6126452B2 -

Info

Publication number: JPS6126452B2
Application number: JP8212780A
Authority: JP
Inventors: Makoto Kawamura; Kyoshi Sagawa
Original assignee: Toyo Seikan Kaisha Ltd
Current assignee: Toyo Seikan Group Holdings Ltd
Priority date: 1980-06-19
Filing date: 1980-06-19
Publication date: 1986-06-20
Also published as: JPS579544A

Description

【発明の詳細な説明】本発明はフランジ部付金属缶胴体の製造方法と
装置に関し、さらに詳しくはフランジ部形成のさ
いフランジ部端縁に毛髪状の塗膜片（以下エナメ
ルヘアとよぶ）が発生することのない内面塗装金
属缶胴体の製造方法と装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a metal can body with a flange, and more specifically, the present invention relates to a method and apparatus for manufacturing a metal can body with a flange, and more specifically, when forming a flange, hair-like paint film pieces (hereinafter referred to as enamel hair) are formed on the edge of the flange. The present invention relates to a method and apparatus for manufacturing a metal can body with an inner surface coated, which does not cause such occurrence.

ビール缶や炭酸飲料缶、一般食缶等を製造する
場合にみられるように、金属大板（錫めつき鋼板
やテインフリースチール等の）の缶胴体内面とな
るべき面に塗料を２重コート（例えば下塗：フエ
ノールエポキシ系塗料、上塗：塩化ビニール系塗
料）してから、ブランクに切断し、このブランク
より常法によりフランジ部付金属缶胴体１（第１
図参照）を製造することがある。この場合に第１
図にみられるように、缶胴体１のフランジ部２
ａ，２ｂのうち一方のフランジ部２ａの切断端面
の外側コーナ２a₂（第４図参照）に沿い知数のエ
ナメルヘア３Ａ（幅約0.2〜0.3mm、厚さ約５〜20
μｍ、長さ約５〜30mm）が屡々発生する。このよ
うなエナメルヘアは１重コートでも塗膜厚さが約
５μｍより厚くなると発生し易くなる。このエナ
メルヘアは製缶工程においてフランジ部の切断端
面から剥れて、しばしば缶胴体内面の塗膜上に付
着残留する。これを除去しようとして回転ブラシ
等をかけても、静電気の作用でますます強く付着
して除去することが困難である。従つて製品であ
る缶の内容物中に屡々混入し、商品価値を著るし
く低下することが多い。 As seen in the production of beer cans, carbonated beverage cans, general food cans, etc., the inner surface of the can body of a large metal plate (such as tin-plated steel plate or stain-free steel) is coated with paint in two layers. (for example, undercoat: phenol epoxy paint, topcoat: vinyl chloride paint), then cut into blanks, and from this blank metal can body 1 with flange part (first
(see figure) may be manufactured. In this case, the first
As seen in the figure, the flange portion 2 of the can body 1
Along the outer corner 2a ₂ (see Fig. 4) of the cut end surface of one of the flange portions 2a of a and 2b, a circular number of enamel hairs 3A (width approximately 0.2 to 0.3 mm, thickness approximately 5 to 20 mm) are
μm, length approximately 5 to 30 mm) often occurs. Such enamel hairs tend to occur when the coating thickness is greater than about 5 μm even with a single coat. These enamel hairs peel off from the cut end surface of the flange portion during the can manufacturing process and often remain attached to the coating on the inner surface of the can body. Even if you use a rotating brush or the like to try to remove it, it becomes more and more stuck due to the action of static electricity, making it difficult to remove. Therefore, they often get mixed into the contents of cans, which are products, often significantly reducing the commercial value.

本発明は以上のような従来技術の問題点に鑑み
なされたものであつて、本発明の目的は、缶内面
となるべき面に比較的厚い塗膜が形成された切断
金属板を使用しても、エナメルヘアの発生しない
フランジ部付金属缶胴体の製造方法と装置を提供
することにある。 The present invention has been made in view of the problems of the prior art as described above, and an object of the present invention is to use a cut metal plate with a relatively thick coating formed on the surface that is to become the inner surface of the can. Another object of the present invention is to provide a method and apparatus for manufacturing a metal can body with a flange portion in which enamel hair does not occur.

本発明者等はエナメルヘアの発生原因を種々検
討した結果、次のことが判明した。第２図、第３
図に示すように、フランジ部形成前の缶胴体１′
の状態で缶胴体１′の切断端面２′ａ，２′ｂには
バリ２′a₁，２′b₁が発生しており、塗膜３は切断
端面２′ａ側においては、バリ２′a₁と反対面の彎
曲部２′a₂と付着しており、一方切断端面２′ｂ側
においては、バリ２′b₁の内面と付着している。
しかしフランジ加工すると第４図に示すように、
バリ２b₁の内面に付着している塗膜部分３ｂは剥
離しないが、彎曲部２a₂に付着していた塗膜部分
３ａは剥離し、大部分がその基部から切断されて
エナメルヘア３Ａを形成し易い。これは切断によ
り彎曲部２′a₂が形成されるさい、塗膜部分３ａ
に引張曲げ応力が加わるので、この部分の塗膜の
密着力が低下するが、切断のみの状態では塗膜部
分３ａの剥離までには至らない。しかしフランジ
加工を行なうと、塗膜部分３ａにはさらに円周方
向の引張応力が加わることと、フランジ加工工具
との摩擦により、遂に剥離し、剥離部の基部より
切断されて、エナメルヘアを形成するものと推測
される。この剥離は塗膜３が厚く硬い（すなわち
延性が小さい）ほど起り易い。一方塗膜部分３ｂ
は切断のさい圧縮曲げ応力を受けるので、そのさ
い密着力はさほど低下しないことと、バリ２b₁に
妨げられてフランジ加工工具と直接接触しにくい
ことがフランジ加工後も剥離切断しないことの原
因と推測される。 The present inventors investigated various causes of enamel hair and found the following. Figures 2 and 3
As shown in the figure, the can body 1' before the flange part is formed.
In this state, burrs 2'a 1 and 2'b 1 are generated on the cut end surfaces _2'a and 2'b of the can body 1', and the coating film 3 has burrs 2'a 1 and 2'b ₁ on the cut end surface 2'a side. It is attached to the curved portion 2'a ₂ on the opposite surface to 'a ₁ , and on the other hand, on the cut end surface 2'b side, it is attached to the inner surface of the burr 2'b ₁ .
However, when the flange is processed, as shown in Figure 4,
The coating film portion 3b attached to the inner surface of the burr 2b ₁ does not peel off, but the coating film portion 3a attached to the curved portion 2a ₂ peels off and most of it is cut from its base to form enamel hair 3A. Easy to do. This is because when the curved part 2'a ₂ is formed by cutting, the coating film part 3a
Since tensile bending stress is applied to the area, the adhesion of the coating film in this area decreases, but the coating film portion 3a does not peel off if only cutting is performed. However, when flanging is performed, additional tensile stress is applied to the coating film portion 3a in the circumferential direction, and due to friction with the flanging tool, it finally peels off and is cut from the base of the peeled part, forming enamel hair. It is assumed that This peeling is more likely to occur as the coating film 3 is thicker and harder (ie, less ductile). On the other hand, the coating film part 3b
Since it is subjected to compressive bending stress during cutting, the adhesion strength does not decrease much during cutting, and the fact that direct contact with the flanging tool is difficult due to the burr _2b1 is the reason why it does not peel off even after flanging. Guessed.

従つて端縁の切断の工程とフランジ部形成の工
程の中間で、彎曲部２′a₂上の塗膜部分３ａを除
去すれば、エナメルヘアの発生を防止できること
を見出した。除去される塗膜部分３ａの幅はほぼ
0.5mmであるから、この部分を除去しても、フラ
ンジ部と端板を２重巻締した後の性能には全く影
響しない。 Therefore, it has been found that the generation of enamel hair can be prevented by removing the coating film portion 3a on the curved portion _2'a2 between the step of cutting the edge and the step of forming the flange portion. The width of the coating film portion 3a to be removed is approximately
Since it is 0.5mm, even if this part is removed, it will not affect the performance after the flange part and end plate are double-sealed.

塗膜部分３ａの除去手段としては、カツター、
グラインダー等の任意の手段が選ばれる。また上
記除去は、フランジ部となるべき端縁を切断した
後、缶胴一個分の大きさ（以下ブランクとよぶ）
の状態、または第２図に示されるフランジ部形成
前の缶胴体１′の状態等において行なわれる。 As a means for removing the coating film portion 3a, a cutter,
Any means such as a grinder may be chosen. In addition, the above-mentioned removal is carried out after cutting the edge that is to become the flange part, and then cutting the edge of the can body (hereinafter referred to as blank) into the size of one can body.
This is carried out in the state shown in FIG. 2, or in the state of the can body 1' before the flange portion is formed as shown in FIG.

次にブランクの状態において、上記除去を行な
う実施例について説明する。 Next, an embodiment in which the above-mentioned removal is performed in a blank state will be described.

第５図、第６図において、５はスリツターであ
つて、金属大板（シート状又はコイル状の）６を
ブランク７に切断するためのスリツターであり、
該スリツター５は２組の上下回転刃５a₁，５b₁お
よび５a₂，５b₂から成り、上回転刃５a₁，５a₂並
びに下回転刃５b₁，５b₂はそれぞれ軸５ｃおよび
軸５ｄに取付られて駆動装置（図示されない）に
よつて回転される。ブランク７の両端縁７ａおよ
び７ｂは缶胴体のフランジ部となるべき端縁に対
応する。切断されたブランク７は矢印方向に進行
して出てくるが、スリツター５に接近して、矢印
で示したブランク７の進行方向からみて下流に位
置するブランク７の端縁７ａの下面側に固定刃８
および真空ノズル１０が、端縁７ｂの下面側に支
持体９が固設されており、また端縁７ａ側の上面
に送り出しロール１１がそのロール面がブランク
７の上面と接触し得る位置に設けられている。な
お第５図においては、これらの部材の外形線（実
線、点線）は、理解を容易にするため金属大板
６、およびブランク７が送入されていない状態の
ものを示した。 In FIGS. 5 and 6, 5 is a slitter for cutting a large metal plate (sheet-like or coil-like) 6 into blanks 7,
The slitter 5 consists of two sets of upper and lower rotary blades 5a ₁ , 5b ₁ and 5a ₂ , 5b ₂ , and the upper rotary blades 5a ₁ , 5a ₂ and the lower rotary blades 5b ₁ , 5b ₂ are attached to a shaft 5c and a shaft 5d, respectively. and rotated by a drive device (not shown). Both edges 7a and 7b of the blank 7 correspond to the edges that are to become the flange portions of the can body. The cut blank 7 advances in the direction of the arrow and comes out, approaches the slitter 5 and is fixed to the lower surface side of the edge 7a of the blank 7 located downstream from the direction of movement of the blank 7 shown by the arrow. Blade 8
A vacuum nozzle 10 is provided with a support 9 fixedly attached to the lower surface of the edge 7b, and a delivery roll 11 provided on the upper surface of the edge 7a at a position where its roll surface can come into contact with the upper surface of the blank 7. It is being In FIG. 5, the outlines (solid lines, dotted lines) of these members are shown without the large metal plate 6 and the blank 7 being fed, for ease of understanding.

上回転刃５a₁は下回転刃５b₁に対し、ブランク
７側に位置するので、第７図に示すようにブラン
ク７の端縁７ａはバリが上面側に発生しており、
一方端縁７ｂはバリが下面側に発生しており、塗
膜３はブランク７（従つて金属大板６）の下面に
形成されている。 Since the upper rotary blade 5a ₁ is located on the blank 7 side with respect to the lower rotary blade 5b ₁ , burrs are generated on the upper surface side of the edge 7a of the blank 7 as shown in FIG.
On the other hand, burrs are generated on the lower surface side of the edge 7b, and the coating film 3 is formed on the lower surface of the blank 7 (therefore, the large metal plate 6).

固定刃８（好ましくは超硬合金よりなる）は刃
先部８ａが斜内下方に傾斜しており、つまり上記
上下回転刃５a₁，５b₁からなるスリツター５に対
してブランク７側に向い且つ水平面に対してある
角度（好ましくはほぼ15度の角度）をなして傾斜
しており、その上部附近が端縁７ａに接触する位
置に固定されており、その高さはねじ１２によつ
て調節される。支持体９は端縁７ｂ側に設けられ
ており、その上面が隣りの固定刃８′の頂部とほ
ぼ同じレベルか、僅かに高い位置にあつて、隣り
の固定刃８′に端縁７ｂが接触するのを防止して
いる。ブランク７は、その両端縁７ａ，７ｂが
夫々固定刃８および支持体９上を滑動して矢印方
向に送り出されるのであるが、送り出しロール１
１（例えばポリウレタンよりなる）は軸１１ａを
介してスリツター５と同期回転してこの滑動を推
進すると同時に、端縁７ａに若干の押圧力を加え
て、その下部コーナの塗膜（第３図の３ａに対応
する）の削除を確実にしている。真空ノズル１０
は削除された塗膜粉を吸引除去するためのもので
あつて、開口部１０ａは刃先８ａに対向してい
る。塗膜粉はホース１３および図示されない吸引
フアンを通つて、集塵袋（図示されない）に収納
される。 The fixed blade 8 (preferably made of cemented carbide) has a cutting edge portion 8a that is inclined inwardly and downwardly, that is, it faces toward the blank 7 side with respect to the slitter 5 consisting of the upper and lower rotary blades 5a ₁ and 5b ₁ and faces the horizontal plane. It is inclined at a certain angle (preferably approximately 15 degrees) with respect to the top edge 7a, and its upper portion is fixed at a position where it contacts the edge 7a, and its height is adjusted by a screw 12. Ru. The support 9 is provided on the side of the edge 7b, and its upper surface is at approximately the same level as the top of the adjacent fixed blade 8' or at a slightly higher position, so that the edge 7b is located on the side of the adjacent fixed blade 8'. Preventing contact. The blank 7 is sent out in the direction of the arrow with both end edges 7a and 7b sliding on the fixed blade 8 and the support 9, respectively.
1 (for example, made of polyurethane) rotates synchronously with the slitter 5 via a shaft 11a to promote this sliding motion, and at the same time applies a slight pressing force to the edge 7a to remove the coating film at the lower corner (see FIG. 3). (corresponding to 3a) is ensured. vacuum nozzle 10
The opening 10a is for suctioning and removing removed paint film powder, and the opening 10a faces the cutting edge 8a. The coating powder passes through the hose 13 and a suction fan (not shown) and is stored in a dust collection bag (not shown).

以上のようにしてフランジ部となるべき端縁の
バリの形成されない側のコーナ（第７図の７a₂）
から、ほぼ幅0.5mmにわたつて塗膜３を削除され
たブランク７は次いで塗膜３が内面に、かつ端縁
７ａ，７ｂが開口端部になるようにして丸められ
てから、半田付、溶接あるいは接着法等の公知手
段によつて側面継目部１４（第８図）を接合され
て缶胴体に形成された後、公知の手段によりフラ
ンジ部１６ａ，１６ｂを形成されてフランジ部付
缶胴体１５（第８図）となる。以上のようにして
製造されたフランジ部付缶胴体１５は、第９図に
示すように彎曲部７a₂上から塗膜３が削除されて
いるので、エナメルヘア３Ａの発生がない。 The corner on the side where the burr is not formed on the edge that will become the flange as described above (7a ₂ in Fig. 7)
The blank 7 from which the coating film 3 has been removed over a width of approximately 0.5 mm is then rolled up so that the coating film 3 is on the inner surface and the edges 7a and 7b are open ends, and then soldered. After the side seam 14 (FIG. 8) is joined by known means such as welding or gluing to form a can body, the flanges 16a and 16b are formed by known means to form a can body with flanges. 15 (Figure 8). In the can body 15 with a flange portion manufactured as described above, the coating film 3 is removed from the curved portion _7a2 as shown in FIG. 9, so that no enamel hair 3A is generated.

本発明の装置によれば、エナメルヘア３Ａの発
生防止をスリツト工程中において行なうことがで
きるので、工程を増やすことなく、他の手段に比
較して容易に目的を達成することができる。さら
に固定刃の高さを調節することによつて送り出し
ロールによる押圧力とのバランスを保ち、コーナ
の塗膜を完全に削除することができる。さらに支
持体が設けられているので、ブランクの支持体側
の端縁が、隣りの固定刃の頂部に接触するのを防
止することができる。また削除された塗膜粉を吸
引除去する真空ノズルが設けられているので、塗
膜粉がブランク上に付着残留して、最終的に製品
である缶の内容物に混入して著るしく商品価値を
損ずるというトラブルを招くおそれもないという
効果を有する。 According to the apparatus of the present invention, the generation of enamel hair 3A can be prevented during the slitting process, so the objective can be achieved more easily than other means without increasing the number of processes. Furthermore, by adjusting the height of the fixed blade, it is possible to maintain a balance with the pressing force from the delivery roll and completely remove the coating film at the corners. Furthermore, since the support is provided, the edge of the blank on the support side can be prevented from coming into contact with the top of the adjacent fixed blade. In addition, since a vacuum nozzle is installed to suction and remove the removed paint film powder, the paint film powder remains attached to the blank and eventually mixes with the contents of the can, which is the final product, resulting in significant product damage. This has the effect that there is no risk of causing problems such as loss of value.

[Brief explanation of the drawing]

第１図はエナメルヘアの発生したフランジ部付
金属缶胴体の斜視図、第２図はフランジ部形成前
の金属缶胴体の斜視図、第３図は第２図の−
線に沿う縦断面図、第４図は第１図の−線に
沿う縦断面図、第５図は本発明の装置の一実施例
の平面図、第６図は第５図の装置の正面図、第７
図は端縁コーナから塗膜を削除する状態を説明す
るための斜視図、第８図は本発明により製造され
たフランジ部付金属缶胴体の斜視図、第９図は第
８図の−線に沿う縦断面図である。３……塗膜、５……スリツター、５a₁，５a₂…
…上回転刃、５b₁，５b₂……下回転刃、７……ブ
ランク（金属板）、７ａ，７ｂ……フランジ部と
なるべき端縁、（ブランク端縁）、７a₂……バリの
形成されない側のコーナ、８……固定刃、８ａ…
…刃先、９……支持体、１０……真空ノズル、１
０ａ……開口部、１１……送り出しロール、１５
……フランジ部付金属缶胴体、１６ａ，１６ｂ…
…フランジ部。 Figure 1 is a perspective view of a metal can body with a flange where enamel hair has occurred, Figure 2 is a perspective view of a metal can body before flange formation, and Figure 3 is the same as in Figure 2.
4 is a longitudinal sectional view taken along the - line in FIG. 1, FIG. 5 is a plan view of an embodiment of the device of the present invention, and FIG. 6 is a front view of the device shown in FIG. 5. Figure, 7th
The figure is a perspective view for explaining the state in which the coating film is removed from the edge corner, FIG. 8 is a perspective view of a metal can body with a flange part manufactured according to the present invention, and FIG. 9 is a line taken along the - line in FIG. FIG. 3... Paint film, 5... Slitter, 5a ₁ , 5a ₂ ...
...Upper rotating blade, 5b ₁ , 5b ₂ ...Lower rotating blade, 7...Blank (metal plate), 7a, 7b...Edge to become flange, (blank edge), 7a ₂ ...Flash Corner on the side that is not formed, 8...Fixed blade, 8a...
...Blade tip, 9...Support, 10...Vacuum nozzle, 1
0a...opening, 11...feeding roll, 15
...Metal can body with flange, 16a, 16b...
...Flange part.

Claims

[Claims] 1. A method for manufacturing a metal can body with a flange from a metal plate whose inner surface, which is to become the inner surface of the metal can body, is coated with a coating film, in which the edge of the metal can body which is to become the flange part is In the middle of the step of cutting and the step of forming the flange portion, the coating film is removed from the corner on the side where the burr is not formed during the cutting of the edge that is to become the flange portion covered with the coating film. A method for producing a metal can body with a flange. 2. The method for manufacturing a metal can body with a flange portion according to claim 1, wherein the coating film is removed from the corner of the metal plate. 3 Cut the edge of the metal plate that is to become the flange part with a slitter, and place a cutter against the surface of the metal plate at the corner where no burr will be formed during the cutting process of the edge that comes out of the slitter. The method for manufacturing a metal can body with a flange portion according to claim 2, wherein the coating film on the corner is removed by bringing an inclined fixed blade into contact with the corner. 4. The method for manufacturing a metal can body with a flange portion according to claim 1, wherein the coating film is removed from the corner of the metal can body before the flange portion is formed. 5 The slitter 5 for cutting a large metal plate 6 into blanks 7 consists of two sets of upper and lower rotary blades 5a ₁ , 5b ₁ and 5a ₂ , 5b ₂ , and the upper rotary blade 5a ₁ is connected to the lower rotary blade 5b _{1 .} On the other hand, it is located on the blank 7 side,
Also, when viewed from the direction of movement of the blank 7, the slitter 5
A fixed blade 8 and a vacuum nozzle 10 are provided on the lower surface side of the blank edge 7a on the downstream side of the blank edge 7a, and a delivery roll 11 is provided on the upper surface side of the blank edge 7a at a position where the roll surface can come into contact with the upper surface of the blank 7, Furthermore, a support member 9 is provided on the lower surface side near the blank edge 7b, and the fixed blade 8 faces the blank 7 side with respect to the slitter 5 consisting of the upper and lower rotary blades 5a ₁ and 5b ₁ and with respect to the horizontal plane. It has a cutting edge 8a which is inclined at an angle, and the cutting edge 8a is provided at a position where it comes into contact with the lower corner of the edge 7a of the blank 7 cut by the slitter 5, and the cutting edge 8a is provided at a position where it comes into contact with the lower corner of the edge 7a of the blank 7 cut by the slitter 5. 10 is the opening 1
An apparatus used for manufacturing a metal can body with a flange portion, characterized in that a cutting edge 0a is provided opposite to a cutting edge 8a.