JP2007069973A - Can body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a can body capable of preventing a so-called distribution pin hole from being generated without increasing the manufacturing cost. <P>SOLUTION: A plurality of recesses 13 having a recessed curved surface are formed by an emboss processing on a barrel part 11 while the plane area of the barrel part 11 in side view from the outside in the radial direction is set to be ≥10 mm<SP>2</SP>and ≤20 mm<SP>2</SP>, and the spacing of the recesses 13 adjacent to each other is set to be ≤1.0 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a can whose contents are sealed.

This type of can body is used for cans with a can lid wrapped around the open end or bottle cans with a cap screwed to the open end, filled with contents such as beverages, sealed, and marketed. It is in circulation. Conventionally, in this distribution process, a pinhole is generated by, for example, a sharp body having a radius of curvature of about 2 mm colliding with the body of the can body, or by colliding with the body of adjacent can bodies, There were problems such as leakage of contents. As means for solving such a problem, for example, a can having a body made of a resin film as shown in Patent Document 1 is known.
JP-A-08-325514

  However, the conventional can body has a problem that an increase in manufacturing cost due to the provision of a resin film cannot be avoided.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a can body that can prevent the occurrence of so-called distribution pinholes without increasing the manufacturing cost.

Such problems to solve, in order to achieve the above object, a can body of the present invention, the body portion, 20 mm planar area when viewed laterally the body portion from the radially outward 10 mm ² or more ² A plurality of recesses having a concave curved surface are formed by embossing, and the interval between the recesses adjacent to each other is 1.0 mm or less.

  According to the present invention, since the concave portion is formed in the body portion, it is possible to prevent the pinhole from being generated in the body portion even when the tip of the sharp body collides with the body portion. That is, even if the tip of the sharpened body collides with the recess, the recess has a concave curved surface, so that the tip and the recess can be brought into surface contact with each other. Can be prevented, and even if the tip of the sharp body collides between the recesses, this part is work hardened by embossing when forming the recess, Even if the tip is in point contact, pinholes can be prevented from occurring.

  Here, a plurality of recess rows formed of a plurality of the recesses formed at regular intervals in the can axis direction at the same circumferential position in the trunk portion are provided at regular intervals in the circumferential direction of the trunk portion. The recess rows that are formed and are adjacent to each other in the circumferential direction are such that the can axis direction position of the recess in one of the recess rows is positioned between the recesses adjacent in the can axis direction of the other recess row. They may be arranged in a zigzag pattern.

  In this case, the interval between the recesses can be uniformly reduced over the entire region of the body, and the hardness of the plurality of recesses, that is, the plurality of unprocessed portions, varies in the body. It is possible to suppress the occurrence of pinholes even when the tip of the sharp body collides with any unprocessed portion.

In addition, the recesses are circular, and the recess rows adjacent in the circumferential direction are tangent lines where the outer peripheral edge of the recess in one of the recess rows is in contact with the outer peripheral edges of the plurality of recesses in the other recess row. It may be arranged so as to overlap with the peripheral edge of the other recess row consisting of
In this case, it is possible to reliably realize the interval between the concave portions to be uniformly reduced over the entire region of the body portion.

  According to the can according to the present invention, the occurrence of pinholes can be prevented.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a schematic configuration of a can shown as an embodiment of the present invention.
A can body 10 shown in FIG. 1 is formed of, for example, aluminum or an aluminum alloy, preferably an AA (Alminum Association) 3000 series aluminum alloy, more preferably an AA3004 series aluminum alloy. And a bottom portion 12 connected to the lower end in the axial direction. The body 11 has a thickness of about 0.085 mm to 0.165 mm and an outer diameter of about 66 mm.

Here, in the trunk portion 11 of the present embodiment, the planar area when the trunk portion 11 is viewed from the outside in the radial direction is 10 mm ² or more and 20 mm ² or less, and the concave portion 13 has a concave curved surface shape. Are formed by embossing. The flat area of the concave portion 13 is measured by a projected area when a region defined by the outer peripheral edge 13c of the concave portion 13 is projected in the radial direction. These recesses 13 are formed in substantially the entire region of the body portion 11 excluding the bottom 12 side having a relatively large thickness. Moreover, the recessed part 13 is formed by giving the embossing which presses the outer peripheral surface of the trunk | drum 11 toward radial inside.

  The concave portion 13 of the present embodiment has a circular shape in a side view when the body portion 11 is viewed from the outside in the radial direction. In the illustrated example, the long axis extends in the can axis direction and the short axis extends in the circumferential direction of the body portion 11. Further, the interval A between the adjacent recesses 13 is 1.0 mm or less, preferably 0.1 mm or more and 1.0 mm or less. The major axis of the recess 13 is about 6 mm and the minor axis is about 3.5 mm.

  Here, between the recessed parts 13 in the trunk | drum 11, ie, the unprocessed part 11a of the recessed part 13, as shown in FIG.2 and FIG.4, the straight line which passes along the radial direction center part of these adjacent recessed parts 13 is extended. A convex curved surface is formed along the direction, and the direction orthogonal to the straight line is substantially flat as shown in FIGS. Further, the unprocessed portion 11a bulges outward in the radial direction from the outer peripheral surface of the body portion 11 before the recess 13 is formed, and is processed and hardened when the recess 13 is formed by embossing. The hardness is higher than.

  The concave portion 13 includes a concave inclined surface 13a that is continuous with the unprocessed portion 11a and has a concave curved surface shape, and a bottom surface 13b that has a concave curved surface shape. The radius of curvature R of the recess 13 is 0.5 mm or more and 2.0 mm or less, and the maximum depth H of the bottom portion 13a is 0.15 mm or more and 0.35 mm or less.

  Further, in the body portion 11 of the present embodiment, a recess row 14 in which a plurality of recesses 13 are formed at the same circumferential position in the body portion 11 with a constant interval in the can axis direction is provided around the periphery of the body portion 11. A plurality are formed at regular intervals in the direction. And the recessed part row | line | column 14 adjacent in these circumferential directions positions the can axial direction position of the recessed part 13 in one recessed part row | line | column 14 between the recessed parts 13 adjacent in the can axial direction in the other recessed part row | line | column 14. They are arranged in a staggered pattern.

  In the illustrated example, the position in the can axis direction of the central portion in the radial direction of the concave portion 13 in the one concave portion row 14 is positioned at the substantially central portion between the concave portions 13 adjacent in the can axial direction in the other concave portion row 14. Has been. Further, the recesses 13 adjacent to each other in the circumferential direction of the body part 11 are formed in the body part 11 so that the outer peripheral edges 13 c thereof overlap each other in the circumferential direction of the body part 11.

  Furthermore, in the present embodiment, as shown in FIG. 2, the circumferentially adjacent recess rows 14 include the outer peripheral edge 13 c of the recess 13 in one recess row 14 and the plurality of recesses 13 in the other recess row 14. It arrange | positions so that it may overlap with the peripheral edge 14a of the said other recessed part row | line 14 which consists of a tangent which touches each outer periphery 13c.

  As described above, according to the can 10 according to the present embodiment, since the concave portion 13 is formed in the trunk portion 11, even when the tip of the sharp body collides with the trunk portion 11, the trunk portion 11. It is possible to prevent pinholes from occurring. That is, even if the tip of the sharpened body collides with the recess 13, it becomes possible to bring these tips and the recess 13 into surface contact, and it is possible to prevent the pinhole from being generated in the recess 13. Even if the tip of the sharp body collides with the recesses 13, that is, with the unprocessed portion 11 a, the unprocessed portion 11 a is work hardened by embossing when the recess 13 is formed. Even if the tip is in point contact, it can be prevented that a pinhole is generated.

  Moreover, in this embodiment, the recessed part row | line | column 14 is formed in multiple numbers by the circumferential direction of the trunk | drum 11, and the can axial direction position of the recessed part 13 in one recessed part row | line | column 14 of the recessed part row | line | column 14 adjacent in the circumferential direction is the other. Since it is arranged in a zigzag manner so as to be positioned between the recesses 13 adjacent to each other in the can axis direction in the recess row 14, the interval between the recesses 13 should be evenly reduced over the entire area of the body 11. It becomes possible to prevent the hardness of the plurality of recesses 13, that is, the plurality of unprocessed portions 11 a, from varying in the body portion 11, and the tip end portion of the sharpened body can be any of the unprocessed portions. Even when it collides with the portion 11a, it is possible to prevent the pinhole from occurring.

  Furthermore, in this embodiment, the recessed part 13 is made into circular shape, and as shown in FIG. 2, the recessed part row | line | column 14 adjacent in the circumferential direction has the outer periphery 13c of the recessed part 13 in one recessed part row | line | column 14, and the other recessed part row | line | column. 14 is arranged so as to overlap with the peripheral edge 14a, so that the interval between the recesses 13, that is, the size of the unprocessed portion 11a can be reduced uniformly over the entire region of the body portion 11. Can be realized.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the concave portion 13 having a circular shape when viewed from the side is shown, but the present invention is not limited thereto, and may be a rectangular shape or a circular shape when viewed from the side.

Here, when the recesses 13 that are rectangular in a side view are adopted, the recess rows 14 that are adjacent in the circumferential direction are such that the outer peripheral edge 13c of the recess 13 in one recess row 14 is the same as that of the other recess row 14. It is not necessary to arrange so that it may overlap with peripheral edge 14a.
Moreover, it may replace with the recessed part 13 of the said embodiment, and it is good also as elliptical shape that a long axis extends in the circumferential direction of the trunk | drum 11, and a short axis extends in the can axis direction.

  Furthermore, in the said embodiment, the recessed part row | line | column 14 adjacent in the circumferential direction has the can axial direction position of the recessed part 13 in one recessed part row | line | column 14, between the recessed parts 13 adjacent in the can axial direction in the other recessed part row | line | column 14. However, instead of this, a plurality of recesses 13 are formed in the body portion 11 at the same axial position in the can axis at regular intervals in the circumferential direction. In addition, a plurality may be formed at the same circumferential position with a certain interval in the can axis direction.

  Further, the can body 10 may be applied to a so-called can that is configured to wind a can lid (not shown) around the opening, or is connected to the upper end of the body portion 11 in the can axis direction and is directed upward. In accordance with a shoulder portion that is gradually reduced in diameter, and a base portion that is connected to the upper end portion of the shoulder portion and that extends upward and has a male screw portion, and a cap is screwed onto the base portion. It may be applied to bottle cans.

  A can body that can prevent the occurrence of pinholes.

It is the external view which looked at a part of trunk | drum of the can shown as one Embodiment of this invention from the radial direction outer side. FIG. 2 is a partially enlarged view of a trunk portion shown in FIG. 1. FIG. 3 is a cross-sectional view of the trunk portion shown in FIG. FIG. 3 is a cross-sectional view taken along line YY of the trunk portion shown in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 can body 11 trunk | drum 13 recessed part 14 recessed part row | line | column 14a peripheral edge A of a recessed part row | line

Claims (3)

The body portion has a flat area of 10 mm ² or more and 20 mm ² or less when the body portion is viewed from the outside in the radial direction, and a plurality of concave portions having a concave curved surface are formed by embossing and are adjacent to each other. A can body characterized in that an interval between the recesses is 1.0 mm or less. The can according to claim 1,
A plurality of recess rows composed of a plurality of the recesses formed at a certain interval in the can axis direction at the same circumferential position in the trunk portion are formed at a certain interval in the circumferential direction of the trunk portion,
The recess rows adjacent in the circumferential direction are staggered such that the can axis direction positions of the recesses in one of the recess rows are positioned between the recesses adjacent in the can axis direction of the other recess row. Cans characterized in that they are arranged in an array. In the can according to claim 2,
The recesses are circular, and the recess rows adjacent in the circumferential direction are composed of tangent lines where the outer peripheral edge of the recess in one of the recess rows is in contact with the outer peripheral edges of the plurality of recesses in the other recess row. A can that is arranged so as to overlap with a peripheral edge of the other recess row.

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