JP3715792B2 - Laminated metal plate for 3-piece can, manufacturing method thereof, and 3-piece can - Google Patents

Description

【００１５】
【発明の効果】
以上述べたごとく本発明によれば、金属板表面に樹脂被膜を有する、いわゆるラミネート板を素材とした３ピース金属容器においてネッキング、フランジまたはエキスパンド成形性の優れた容器用鋼板および容器を得ることができる。
【図面の簡単な説明】
【図１】板厚が特定部位で変動している鋼板に、一部樹脂被膜が存在しない状態を生じるように樹脂被膜を貼り付けた後の缶成形状態を示す図である。
【符号の説明】
１ 鋼板
２ 板厚変動部
３ 皮膜未被覆位置
４ 皮膜未被覆位置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-piece metal container used for beverage cans, a metal plate for containers, and a method for producing a metal plate for containers.
[0002]
[Prior art]
As for metal plates for containers that are specified for beverage cans, food cans, etc., so-called laminate plates in which a resin film is formed on the surface at the time of the plate are increasing in order to reduce can manufacturing costs. This metal plate is also used as a so-called three-piece can body formed from a can lid, can bottom, and can body. Have One is cracking in the process of expanding the diameter of the end of the can body (flange molding) when winding the can body and can bottom or can lid, and one is the shrinkage performed before tightening the can bottom or can lid. One of the wrinkles in diameter processing (necking molding) is a crack in processing (expand molding) in which a part of the can body portion can be expanded in order to improve design properties. In most cases, these cracks or wrinkles occur in the vicinity of the cut-plate joining portion for forming the can body portion in which the variation in the formation state of the resin film is large.
[0003]
The cause of such cracks in the vicinity of the joint is partly due to strain concentration due to non-uniformity of the steel plate material or shape in the vicinity of the joint in a container formed by welding steel plates to form a can body. it is conceivable that. As countermeasures against this, Japanese Patent Laid-Open Nos. 60-33317 and 2-118028 disclose limiting the components, hot rolling conditions and 2CR rate, controlling the material change caused by welding in the vicinity of the weld, A technique for avoiding concentration is disclosed.
However, they do not pay attention to the difference in the characteristics of the material on both sides of the welded portion that becomes apparent due to the influence of the laminate resin coating, and do not disclose sufficient countermeasures for cracks and the like resulting from this.
[0004]
[Problems to be solved by the invention]
The present invention provides a steel plate for containers and a container excellent in necking, flange or expand formability in a three-piece metal container made of a so-called laminate plate having a resin coating on the surface of the metal plate.
[0005]
[Means for Solving the Problems]
In particular, the inventors have studied the influence of various materials on the formability of the can body of a three-piece can that joins metal plates to form a can body. It was found that cracks are likely to occur at thin portions of the can where there is non-uniformity in the circumferential direction in the can body. In order to improve the moldability of the can body, it has been found that it is effective to reduce the variation of the deformation resistance of the material within a specific range in a thin part of the resin film, and the present invention has been completed. .
The gist of the present invention is to limit the thickness of the metal plate of the part having the resin film of the laminate plate and the part where the resin film does not exist so that the thickness of the metal plate falls within a specific range. And to improve expand moldability.
[0006]
Hereinafter, the present invention will be described in detail.
The basic principle of the present invention is to limit the difference in deformation resistance between the portion with and without the resin coating within a specific range. Therefore, the portion of the laminated plate with the resin coating and the portion of the metal plate with no resin coating are present. The plate thickness is limited as follows.
The plate thickness of the metal plate is not necessarily constant in the longitudinal direction and the width direction of the plate. For example, at both ends in the width direction of a rolled steel plate, there are thin portions called edge drops.
[0007]
Therefore, when a can is produced by arbitrarily collecting materials from a rolled steel plate, the plate thickness may vary depending on the portion of the can. As shown below, this non-uniform thickness of the plate leads to variations in the deformation resistance of the container body of each container. The inventors of the present invention have completed the present invention by evaluating the can moldability of the steel sheet after the resin film has been applied in such a manner that a resin film does not exist in part.
[0008]
That is, the deformation resistance of the metal plate having the resin film is not limited to the deformation resistance of the metal plate alone, but depending on the deformation resistance of the resin film alone or the bonding method between the metal plate and the resin film, It is also necessary to consider deterioration due to aging. In the present invention, a metal plate for a three-piece metal container having a resin coating on one side or both sides of which a presence or absence of a coating is formed depending on the circumferential position of the can barrel when molded as a can barrel, or manufactured using the same In a piece metal container, {(plate thickness of only the metal plate of the resin coating uncoated portion) − (plate thickness of only the metal plate excluding the coating of the coating coating portion)} / (metal plate excluding the coating of the coating coating portion) (Thickness only) between −0.04 and −0.03 or between +0.01 and +0.08. Outside this range, the can moldability deteriorates. Desirably between +0.01 and +0.08.
[0009]
In addition, the metal plate for the laminate plate has irregularities that change the thickness of the part where the resin film is not formed in the process of forming the resin film after manufacturing the metal plate within a specific range compared to the part where the resin film is formed. Forming can improve the moldability when the can body made of a laminate plate is expanded, necked or flange-molded. This range is from {(plate thickness of the portion where the resin coating is not coated) − (plate thickness of the portion where the coating is coated)} / (plate thickness of the portion where the coating is coated) from -0.04 to -0.03. Or from +0.01 to +0.08, and if it deviates from this, the moldability deteriorates. Again, this is preferably between +0.01 and +0.08.
[0010]
As a method for forming such irregularities, there are a method of rolling with a rolling roll having irregularities and a method of partially grinding with a narrow polishing roll when a metal plate is manufactured through a rolling process.
[0011]
As described above, the basic principle of the present invention is to reduce the difference in deformation resistance (deformation resistance combining resin and metal plate) between the portion with and without the resin coating. The processing or the flange processing is affected not only by the material of the metal plate and the resin coating, but also by the shape of the can body joining portion and the can body joining method. For example, when a steel plate is used as the metal plate and the can body is joined by welding, the welded portion is hardened and the heat affected zone is softened, so that the phenomenon is complicated and the effect of deformation of these portions is taken into account. Although there is an unclear part in the mechanism of the expression, sufficient effects can be obtained within the conditions of the present invention.
[0012]
The metal plate which this invention makes object does not ask | require types, such as a steel plate, an aluminum plate, and a copper plate. The method for forming the resin film may be any method such as a method of attaching a resin film to a metal plate or a method of applying a liquid resin. An adhesive is also used when applying a resin film. Any method such as partial melting of the film by heat treatment may be used. The effect can be obtained within the scope of the present invention regardless of the type and thickness of the resin such as polyester, polyethylene, and polypropylene. The effect of the present invention is not impaired even when the metal plate is subjected to a surface treatment for improving the corrosion resistance and the adhesion to the resin.
[0013]
【Example】
FIG. 1 is a diagram showing a can-molded state after a resin coating is applied to a steel plate whose thickness varies at a specific part so as to produce a state in which no resin coating is present. FIG. 1A shows a case where there is a plate thickness variation in the vicinity of the welded portion, and FIG. 1B shows a case where there is a plate thickness variation in a portion that is not affected by welding.
As shown in FIG. 1, the steel sheet 1 whose thickness varies at a specific portion is coated with a resin coating from both sides so as to avoid the portion corresponding to the variation in thickness, that is, the thickness variation portion 2. Table 1 shows the evaluation of formability when a laminated steel sheet is formed into a cylindrical three-piece can body by welding and subjected to expand forming, neck forming and flange forming. Example Nos. 1 to 6 have a plate thickness variation in the vicinity of the welded portion (coating uncoated position 3 in FIG. 1), and Examples Nos. 7 to 12 have a plate thickness variation at a site not affected by welding ( It is a film uncoated position 4) in FIG. These plate thickness variations were formed by rolling or surface grinding.
It can be confirmed that good can moldability is obtained by controlling the characteristics of the resin-coated steel sheet defined in the present invention, the characteristics of the resin film and the heat treatment conditions within the scope of the present invention.
[0014]
[Table 1]

[0015]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain a steel plate and a container for a container excellent in necking, flange or expand formability in a three-piece metal container made of a so-called laminated sheet having a resin film on the surface of the metal sheet. it can.
[Brief description of the drawings]
FIG. 1 is a view showing a can-molded state after a resin coating is applied to a steel plate whose thickness varies at a specific part so as to produce a state in which a part of the resin coating does not exist.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel plate 2 Thickness fluctuation | variation part 3 Film | membrane uncoated position 4 Film | membrane uncoated position

Claims (8)

A three-piece metal container with or without a resin coating on one or both sides of the can body, {(plate thickness of only the metal plate of the resin coating uncoated portion)-(metal plate excluding the coating of the coating coating portion) Expandable formability, neck formability, and thickness of only the metal sheet)} / (thickness of only the metal plate excluding the coating of the coating portion) is between −0.04 and −0.03. 3-piece can with good flange formability.   A three-piece metal container with or without a resin coating on one or both sides of the can body, {(plate thickness of only the metal plate of the resin coating uncoated portion)-(metal plate excluding the coating of the coating coating portion) Expandable formability, neck formability and flange forming, characterized in that the thickness of only the sheet thickness}} / (thickness of only the metal plate excluding the coating of the coating covering portion) is between +0.01 and +0.08 3 piece can with good properties. A metal plate for a three-piece metal container having a resin coating on one side or both sides so that the presence or absence of a coating is formed depending on the circumferential position of the can when molded as a can body, and {(metal plate of resin coating uncoated portion Thickness (only the thickness of the metal plate excluding the coating film)} / (only the thickness of the metal plate excluding the coating film) is from -0.04 to -0.03. A laminate metal plate for a three-piece can having good expand formability, neck formability, and flange formability.   A metal plate for a three-piece metal container having a resin coating on one side or both sides so that the presence or absence of a coating is formed depending on the peripheral position of the can barrel when molded as a can body, {(metal plate of resin coating uncoated portion) Thickness of only the metal plate) − (thickness of only the metal plate excluding the coating of the coating covering portion)} / (thickness of the metal plate only of the coating excluding the coating of the coating covering portion) is between +0.01 and +0.08 A laminate metal plate for a three-piece can having excellent expand formability, neck formability, and flange formability. In the process of forming a resin film after manufacturing the metal plate, {(thickness of the metal plate at the portion where the resin coating is not coated) − (thickness of the metal plate at the portion where the coating is coated)} / (of the portion where the coating is coated) Metal for laminates used in 3-piece cans with excellent expandability, neckability and flangeability that have irregularities such that the thickness of the metal plate is between -0.04 and -0.03 Board.   In the process of forming a resin film after manufacturing the metal plate, {(thickness of the metal plate where the resin film is not coated) − (thickness of the metal plate where the film is coated)} / (of the portion where the film is coated) A metal plate for a laminate plate, which is used for a three-piece can having an uneven shape such that the thickness of the metal plate is between +0.01 and +0.08, and which has good expand formability, neck formability and flange formability. When a metal plate is manufactured through a rolling process, in the process of forming a resin film after the metal plate is manufactured, {(plate thickness of the metal plate where the resin film is not coated)-(the plate of the metal plate where the film is coated) Thickness}} / (thickness of the metal plate of the portion coated with the coating) is between −0.04 and −0.03 , and the roll is rolled with uneven rolls. A method for producing a metal plate for a laminate plate used in a three-piece can having good formability, neck formability and flange formability.   When a metal plate is manufactured through a rolling process, in the process of forming a resin film after the metal plate is manufactured, {(plate thickness of the metal plate where the resin film is not coated) − (the plate of the metal plate where the film is coated) Thickness}} / (Thickness of the metal plate where the coating is coated) is rolled with a roll having irregularities so that the thickness is between +0.01 and +0.08. The manufacturing method of the metal plate for laminate plates used for a 3 piece can with good neck formability and flange formability.

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