Metal can, method of manufacturing metal can, and metal mold for metal can

Abstract

To provide a metal can that can prevent occurrence of wrinkles and fractures even when having a tapered side wall, a method of manufacturing the metal can, and a metal mold for the metal can.SOLUTION: A metal can 1 comprises: a tapered side wall part 11 which has, in a circumferential direction, one end formed having a larger diameter than the other end and has a plurality of molded surfaces 21a and a plurality of connection surfaces 21b connecting with adjacent molded surfaces 21a, 21a; and a bottom lid 12 which is provided on an end part on a small diameter side of the side wall part 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a metal can having a tapered sidewall, a method for manufacturing the metal can, and a mold for the metal can. [Background technology]

[0002] Conventionally, tapered cans with tapered side walls have been known as metal cans for filling beverages with. Methods using press molding or drawing have been proposed as methods for forming such tapered cans (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-202541 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-224108 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional tapered can forming processes using press forming or drawing, the tapered sidewall can have problems such as wrinkles on the sidewall or breakage of the can body.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a metal can, a method for manufacturing a metal can, and a mold for a metal can, which are capable of preventing wrinkles and breakage even when the side wall is tapered. [Means for solving the problem]

[0006] According to one aspect of the present invention, a metal can includes a tapered side wall portion having one end formed with a larger diameter than the other end and having a plurality of circumferentially extending molding surfaces and a plurality of connecting surfaces continuous with adjacent molding surfaces, and a bottom lid provided at an end portion on the smaller diameter side of the side wall portion, wherein the circumferential width of the molding surfaces is set larger than the circumferential width of the connecting surfaces, and the side wall portion has a cylindrical portion at an end portion on the bottom lid side that is aligned along the axial direction of the side wall portion. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a metal can and a method for manufacturing a metal can that can prevent the occurrence of wrinkles and breakage even when the side wall is tapered. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a configuration of a metal can according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 2 is an enlarged cross-sectional view showing the configuration of the metal can. [Figure 5] FIG. 2 is an explanatory diagram schematically illustrating an example of the metal can manufacturing apparatus. [Figure 6] FIG. 3 is a cross-sectional view schematically showing the configuration of a mold of the manufacturing apparatus. [Figure 7] 3 is a flowchart showing an example of a method for manufacturing the metal can. DETAILED DESCRIPTION OF THE INVENTION

[0009] A metal can 1, a method for manufacturing the metal can 1, and a manufacturing apparatus 100 according to one embodiment of the present invention will be described below with reference to FIGS.

[0010] First, the configuration of a metal can 1 according to one embodiment will be described with reference to Fig. 1 to Fig. 7. Fig. 1 is a side view showing the configuration of a metal can 1 according to one embodiment of the present invention, and Fig. 2 is a cross-sectional view showing the configuration of the metal can 1 from the side. Fig. 3 is a cross-sectional view showing the configuration of the metal can 1 taken along line III-III in Fig. 2, and Fig. 4 is a cross-sectional view showing the configuration of the metal can 1 enlarged from the same direction as Fig. 3.

[0011] As shown in Figures 1 and 2, the metal can 1 includes a side wall 11 and a bottom lid 12. The metal can 1 is a so-called tapered can in which the side wall 11 is tapered so that the diameter gradually increases from the bottom lid 12 toward the opening at the top end. The metal can 1 is used as a cup-shaped container for beverages or the like, a beverage can filled with beverages, or the like. In this embodiment, the metal can 1 is described using an example in which it is used as a cup having a curled portion 23 provided at the opening at the top end of the side wall 11.

[0012] The side wall 11 is a tapered can body having one end with a larger diameter than the other end. The end of the side wall 11 on the smaller diameter side forms the lower end to which the bottom lid 12 is fixed.

[0013] As a specific example, the side wall 11 includes a tapered portion 21, a cylindrical portion 22 provided at the lower end of the tapered portion 21, and a curled portion 23 provided at the upper end of the tapered portion 21. Such a side wall 11 is obtained by cutting a flat metal plate such as steel or aluminum into a rectangular shape, rolling it into a cylindrical shape, and welding the ends to form a cylindrical can body member having openings at both ends, and then processing the side wall of the can body member into a tapered shape.

[0014] The flat plate forming the can body member may be subjected to anti-corrosion treatment, for example, by forming a thermoplastic resin film on the surface that will become the inner peripheral surface when the can body is made into the side wall portion 11.

[0015] The tapered portion 21 is provided, for example, in a range from the lower end to the upper end of the side wall portion 11. In this embodiment, the taper angle θ of the tapered portion 21 shown in Fig. 2 is set, for example, to about 2.5 degrees with respect to the central axis C of the side wall portion 11 (tapered portion 21). However, the taper angle θ of the tapered portion 21 is not limited and can be set appropriately.

[0016] The tapered portion 21 is formed so that one end (upper end) has a larger diameter than the other end (lower end). The tapered portion 21 also has a plurality of molding surfaces 21a in the circumferential direction and a plurality of connecting surfaces 21b that are continuous with adjacent molding surfaces 21a. In other words, the tapered portion 21 is configured by the molding surfaces 21a and the connecting surfaces 21b being alternately and continuously arranged in the circumferential direction.

[0017] The molding surface 21a is formed in a flat shape having a predetermined width.

[0018] The connecting surface 21b connects adjacent molding surfaces 21a in the circumferential direction. For example, the connecting surface 21b is formed into a shape that is recessed radially inward with a predetermined radius of curvature. For example, the circumferential width of the molding surface 21a is set larger than the circumferential width of the connecting surface 21b.

[0019] 3 and 4, the cross section of the tapered portion 21 has a shape in which the molding surfaces 21a protrude radially outward and the connecting surfaces 21b recess radially inward, resulting in a shape with repeated concave and convex shapes in the circumferential direction. Note that the circumferential shape of the cross section of the tapered portion 21 formed by the multiple molding surfaces 21a and multiple connecting surfaces 21b is not strictly circular, but approximates a circle. Furthermore, the circumferential shape of the tapered portion 21 approaches a circle as the number of molding surfaces 21a and connecting surfaces 21b increases.

[0020] The cylindrical portion 22 is formed along the central axis C of the side wall portion 11. In other words, the cylindrical portion 22 is formed in a cylindrical shape having the same diameter. In other words, when the metal can 1 is in an orientation in which the central axis C is aligned vertically, the cylindrical portion 22 constitutes a vertical wall extending vertically. A flange to be seamed with the bottom lid 12 is formed on the cylindrical portion 22 at a location where the bottom lid 12 is fixed. Such a cylindrical portion 22 is provided to facilitate seaming when the bottom lid 12 is seamed.

[0021] The curled portion 23 is formed at the opening at the upper end of the side wall portion 11 by curling.

[0022] The bottom lid 12 is formed from a flat plate made of a metal material such as an aluminum alloy or steel. The bottom lid 12 is formed in a disk shape and has a flange on its outer periphery. The bottom lid 12 is integrally formed with the side wall 11, which is the can body, by being seamed to a flange formed on the cylindrical portion 22 of the side wall 11. The bottom lid 12 closes the lower end of the side wall 11 in a liquid-tight and airtight manner.

[0023] Next, the configuration of an apparatus 100 for manufacturing metal cans 1 will be described with reference to Fig. 5 and Fig. 6. Fig. 5 is an explanatory diagram that schematically shows an example of the apparatus 100 for manufacturing metal cans 1, and Fig. 6 is a cross-sectional view that schematically shows the configuration of a mold 101 used in the manufacturing apparatus 100.

[0024] The manufacturing apparatus 100 described in this embodiment is an expand molding apparatus for molding the side wall portion 11. As shown in Figures 5 and 6, the manufacturing apparatus 100 includes a movable mold 111, a wedge shaft 112, a drive device 113 that moves the wedge shaft 112 to drive the movable mold 111, and a control device 114 that controls the drive device 113. The manufacturing apparatus 100 places the movable mold 111 inside a cylindrical can body member 11A and drives the movable mold 111 to expand-mold the can body member 11A.

[0025] The movable die 111 and the wedge shaft 112 constitute a metal can mold 101 for expand-molding the side wall portion 11. In Fig. 5, the right side of the central axis C shows the movable die 111 and the wedge shaft 112 before the side wall portion 11 is molded, and the left side of the central axis C shows the movable die 111 and the wedge shaft 112 during molding of the side wall portion 11. In Fig. 5, a can body member 11A before molding for molding the side wall portion 11 is indicated by a two-dot chain line.

[0026] The movable die 111 includes a plurality of segments 121 that are movable in the radial direction from its axis. The movable die 111 is an expanding die for expanding and molding the can body member 11A. The movable die 111 has a tapered outer surface in the circumferential direction formed by the plurality of segments 121, which forms the side wall portion 11.

[0027] The movable mold 111 is formed into a truncated cone shape as a whole, for example, a hollow, approximately circular truncated cone shape or a hollow, polygonal truncated cone shape, by a plurality of segments 121 that are radially divided about the axis of the movable mold 111. In the example of this embodiment, the movable mold 111 is formed into a hollow, polygonal truncated cone shape by a plurality of segments 121.

[0028] As a specific example, the movable mold 111 is configured by segments 121 obtained by dividing a mold in the shape of a truncated dodecagonal pyramid into twelve parts around the central axis C. Therefore, for example, twelve segments 121 are provided in this embodiment.

[0029] The movable die 111 includes a molding section 123 formed by the outer surfaces of the plurality of segments 121 facing the inner peripheral surface of the can body member 11A, a sliding section 124 formed by the inner surfaces of the plurality of segments 121, and a holding section 125 provided on one end side of the segment 121. As the sliding section 124 and the wedge shaft 112 slide, the plurality of segments 121 move radially outward, and the circumscribed circle of the molding section 123 expands in diameter. Note that, for example, as shown in FIG. 5, the segment 121 is formed by integrally combining the molding section 123 and the sliding section 124, which are formed separately. Note that, as shown in FIG. 6, the segment 121 may be formed from a single member, with the outer surface forming the molding section 123 and the inner surface forming the sliding section 124.

[0030] When the movable die 111 is molding the can body member 11A, the segments 121 are arranged so that, as a result of the multiple segments 121 moving in a direction away from the axis of the movable die 111 in the radial direction, the outer diameter expands and the molding portion 123 assumes a shape that molds the molding surface 21a of the side wall portion 11 on the can body member 11A. In addition, as the segments 121 move in a direction away from the axis of the movable die 111 in the radial direction, the gap between adjacent segments 121 in the circumferential direction gradually increases.

[0031] 5, the molding portion 123 has an inclined surface that is inclined with respect to the central axis C of the movable mold 111, at least in the region of its outer surface that faces the can body member 11A. For example, the inclination angle θ of the inclined surface of the molding portion 123 is inclined at the same angle as the taper angle θ of the tapered portion 21 of the side wall portion 11. For this reason, in this embodiment, the inclination angle θ of the outer surface of the molding portion 123 with respect to the central axis C of the movable mold 111 is set to approximately 2.5 degrees.

[0032] The sliding portion 124 has, for example, an inclined surface on the side of the central axis C of the movable mold 111 that is inclined with respect to the central axis C. A part of the wedge shaft 112 is inserted into the sliding portion 124 along the axial direction of the movable mold 111, and the outer peripheral surface of the wedge shaft 112 slides against the inclined surface of the sliding portion 124 of each segment 121, thereby changing the linear movement of the wedge shaft 112 into radially outward movement of the segments 121.

[0033] The holding portion 125 is held by a holder that, for example, allows each segment 121 to move radially relative to the central axis C of the movable mold 111 and holds the segment 121 so that it can be biased toward the axis of the movable mold 111 by a biasing member such as a spring.

[0034] The wedge shaft 112 is inserted into the center of the movable mold 111 (the plurality of segments 121). The tip of the wedge shaft 112 that is inserted into the plurality of segments 121 is formed in a tapered shape. As a specific example, the wedge shaft 112 has a shaft portion 112a and a sliding portion 112b provided at one end of the shaft portion 112a. The shaft portion 112a is connected to the driving device 113. The shaft portion 112a is formed, for example, in a cylindrical shape. The sliding portion 112b is formed, for example, in a conical or truncated conical shape, and is formed integrally with the shaft portion 112a. The sliding portion 112b is inserted into an opening in the center of the movable mold 111 (the plurality of segments 121) and slides against the inclined surface of the sliding portion 124, thereby moving each segment 121 in the radial direction.

[0035] The driving device 113 reciprocates the wedge shaft 112 in a direction (axial direction) along the central axis C. The driving device 113 may be composed of, for example, a hydraulic pump, various control valves, a hydraulic cylinder, etc., or may be composed of a motor, a conversion mechanism that converts the rotation of the motor into linear movement, etc.

[0036] The control device 114 controls the drive device 113 to reciprocate the wedge shaft 112 relative to the movable mold 111. The control device 114 can be set appropriately as long as it can control the drive device 113. The control device 114 is, for example, a control panel, a processing terminal such as a PC, etc. For example, the control device 114 includes a processor, memory, etc., and controls the drive device 113 by the processor executing parameters and various programs stored in the memory.

[0037] Next, a method for manufacturing the metal can 1 will be described with reference to the flowchart of Fig. 7. Fig. 7 is a flowchart showing an example of a method for manufacturing the metal can 1. Note that in each step, molding is performed using various molding devices.

[0038] 7, in a first step, a metal plate is rolled into a cylindrical shape and its circumferential ends are welded together to form a can body member 11A (step ST11). Next, in a second step, the formed can body member 11A is expand-molded by a manufacturing apparatus 100 to form the can body member 11A into a tapered shape (step ST12).

[0039] The second step will be specifically described with reference to Fig. 5. In the second step, the can body member 11A is formed using the manufacturing apparatus 100 described above.

[0040] As shown on the right side of the central axis C in Fig. 5, the can body member 11A is disposed outward from the multiple segments 121. Before expand molding, the multiple segments 121 are located radially inward from the inner peripheral surface of the can body member 11A, and the inclined surfaces (outer surfaces) of the molding portions 123 of the segments 121 face the inner surface of the can body member 11A.

[0041] At this time, the sliding portion 112b of the wedge shaft 112 is located below the sliding portion 124 of the segment 121. When the control device 114 controls the driving device 113, the driving device 113 moves the wedge shaft 112 linearly upward (into the plurality of segments 121). Then, as shown on the left side of the central axis C in FIG. 5 , the sliding portion 112b of the wedge shaft 112 slides on an inclined surface formed on the central axis C side of the sliding portion 124 of the plurality of segments 121.

[0042] Since the outer peripheral surface of the sliding portion 112b of the wedge shaft 112 and the inclined surfaces of each segment 121 are inclined with respect to the movement direction of the wedge shaft 112, each segment 121 is pushed outward radially in the radial direction with respect to the movement direction of the wedge shaft 112.

[0043] As a result, the inclined surfaces of the multiple segments 121 press against the can body member 11A, plastically deforming the can body member 11A into a tapered shape. This forms a molding surface 21a in the area of the can body member 11A that abuts against the inclined surfaces of the molding portions 123. Furthermore, a connecting surface 21b that connects adjacent molding surfaces 21a, 21a is formed in the area of the can body member 11A that does not contact the inclined surfaces of the molding portions 123 of the segments 121, i.e., in the area of the can body member 11A that faces the area between adjacent segments 121. Here, the connecting surface 21b plastically deforms and inclines in response to the plastic deformation of the molding surface 21a. In this way, the multiple segments 121 of the movable mold 111 move radially outward, forming the can body member 11A into a tapered shape.

[0044] Next, in the third step, the lower end side of the tapered can body member 11A is shaped and reduced in diameter to match the diameter of the bottom lid 12 (step ST13). In this third step, the tapered portion 21 and the cylindrical portion 22 are formed in the can body member 11A.

[0045] Next, in the fourth step, flanges 22a and 23a are formed at the upper and lower ends of the can body member 11A (step ST14). Specifically, the flange 22a for seaming the bottom lid 12 is formed at the lower end of the can body member 11A (the lower end of the cylindrical portion 22). Also, the flange 23a for forming the curled portion 23 is formed at the upper end of the can body member 11A (the upper end of the tapered portion 21).

[0046] Next, for example, in the fifth and sixth steps, the upper end of the can body member 11A (the upper end of the tapered portion 21) is curled twice to form the curled portion 23 at the upper end of the tapered portion 21 (steps ST15 and ST16). Through these steps, the side wall portion 11 having the tapered portion 21, the cylindrical portion 22, and the curled portion 23 is formed.

[0047] Next, in the seventh step, the bottom lid 12 is tightened around the flange 22a of the cylindrical portion 22 (step ST17). Through these first to seventh steps, the metal can 1 is manufactured. Since the side wall portion 11 is tapered and can be nested when stacked, the manufactured metal cans 1 are stacked one on top of another (step ST18), for example, before being stored or transported.

[0048] In the metal can 1 configured in this manner, the forming surfaces 21a and the connecting surfaces 21b are alternately arranged in the circumferential direction of the tapered portion 21 by performing expand molding, in which the diameters of the multiple segments 121 of the mold 101 are expanded to form the tapered portion 21 in the can body member 11A. Therefore, when the side wall portion 11 is formed, almost no force is generated acting in the axial direction of the side wall portion 11 (can body). Therefore, the metal can 1 can prevent the side wall portion 11 from being wrinkled or broken.

[0049] Furthermore, since the side wall portion 11 of the metal can 1 is formed in a tapered shape, it can be stored and transported in a smaller volume than a cylindrical metal can of the same diameter.

[0050] Furthermore, since the metal can 1 has a configuration in which multiple molding surfaces 21a and connecting surfaces 21b are arranged alternately, it is possible to create unevenness on the outer peripheral surface of the metal can 1 (side wall portion 11), thereby providing a design feature.

[0051] Furthermore, since the side wall portion 11 has a cylindrical portion 22 at the lower end to which the bottom lid 12 is fixed, processing such as forming the flange 22a and tightening the bottom lid 12 can be easily performed.

[0052] As described above, according to the metal can 1 according to one embodiment of the present invention, by providing a plurality of molding surfaces 21a and a plurality of connecting surfaces 21b by expand molding, it is possible to prevent the occurrence of wrinkles and breakage even if the tapered side wall portion 11 is tapered.

[0053] The present invention is not limited to the above-described embodiment. For example, in the above example, the movable mold 111 is divided into 12 segments 121, but the present invention is not limited to this. That is, the number of segments 121 can be set as appropriate. For example, the greater the number of segments 121, the greater the number of molding surfaces 21a of the side wall portion 11, and the more the cross-sectional shape of the side wall portion 11 approaches a circle. When the cross-sectional shape of the side wall portion 11 approaches a circle, processing such as flange forming, curl forming, and bottom cover seaming becomes easier. Furthermore, since the number of molding surfaces 21a of the side wall portion 11 varies depending on the number of segments 121, the number of segments 121 can also be set from the perspective of design.

[0054] In the above example, the diameter of the plurality of segments 121 is expanded by moving the wedge shaft 112 in one direction using the drive device 113, but this is not limiting, and the method of driving the plurality of segments 121 and the method of driving the wedge shaft 112 can be set as appropriate. In other words, various configurations can be used for the drive device 113 of the wedge shaft 112 as long as the diameter of the plurality of segments 121 can be expanded. Furthermore, the diameter of the plurality of segments 121 may be expanded by a configuration other than the wedge shaft 112.

[0055] In the above example, the inclined surface of the molding portion 123 of each segment 121 is formed in a substantially flat shape, and the molding surface 21a is formed in a flat shape. However, this is not limiting. For example, the molding portion 123 may be formed in a curved shape or may have an uneven shape. That is, the shape of the inclined surface of the molding portion 123 of each segment 121 and the shape of the inclined surface of the molding portion 123 formed by the segment 121 can be appropriately set to provide design and distinctiveness. Furthermore, the division direction of the multiple segments 121 is not limited to the radial direction and can be appropriately set as long as the side wall portion 11 can be formed in a tapered shape. That is, as long as the side wall portion 11 can be formed in a tapered shape, the surface direction of the inclined surface of the molding portion 123 and the surface direction of the molding portion 123 may be inclined with respect to the axial direction and radial direction of the central axis C, or may be curved in a spiral shape.

[0056] In the above example, the metal can 1 has a curled portion 23 formed by curling at the opening of the side wall 11, and is used as a cup. However, the present invention is not limited to this. For example, the upper end of the side wall 11 may have a curled seam formed by seam folding. The metal can 1 may also be processed or configured appropriately, such as by providing a flange 23a at the upper end of the side wall 11 and fastening a separate stay-on-tab type lid that can form an opening such as a drinking spout. For example, by fastening a separate lid that can form an opening, the metal can 1 can be used to can beverages or food.

[0057] Metal can 1 can be used as a container for various beverages such as juice, tea, and alcoholic beverages, and can also be used as a container for foods other than beverages. For example, since metal can 1 is made of a metal material, it can be used for cooking in a hot water bath or on a stove, and if used for canned foods, it can also be retorted.

[0058] Furthermore, the metal can 1 can be used in a variety of ways, such as by covering it with a plastic lid, holding it in a holder with a handle, or by providing an insulating member on the can body to prevent condensation when used for hot beverages, and can be used in the same way as a conventional paper cup or plastic cup. Furthermore, since the metal can 1 is highly durable, it can be reused as a cup after being used for canned goods, etc. In this way, the metal can 1 can be used for a variety of purposes.

[0059] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. The following is a description equivalent to the invention described in the original claims of the present application: [1] A tapered side wall portion having one end formed with a larger diameter than the other end and having a plurality of molding surfaces in the circumferential direction and a plurality of connecting surfaces continuing with the adjacent molding surfaces; a bottom cover provided at an end of the side wall portion on the small diameter side; A metal can comprising: [2] The metal can according to [1], wherein the side wall portion has a cylindrical portion at the end on the bottom lid side that is aligned along the axial direction of the side wall portion. [3] The metal can according to [1] or [2], wherein the molding surface is formed into a flat surface. [4] An expanding die having a plurality of segments that are combined together to form an overall frustum shape and are divided around a central axis, and a wedge shaft that is disposed at the center of the plurality of segments and moves axially to move the plurality of segments radially outward, is disposed within a cylindrical can body member; Moving the wedge shaft in the axial direction; the plurality of segments are expanded radially outward from the inside of the can body member, and the outer surfaces of the segments are pressed against the inner wall surface of the can body member, thereby forming a tapered side wall portion having a plurality of molding surfaces in the can body member. Manufacturing method of metal cans. [5] The method for manufacturing a metal can according to [4], wherein the small-diameter end of the can body member on which the tapered side wall portion is formed is reduced in diameter to form a cylindrical portion along the axial direction in the side wall portion. [6] The method for manufacturing a metal can according to [5], further comprising the step of: fastening a bottom lid to the cylindrical portion. [7] The method for manufacturing a metal can according to any one of [4] to [6], wherein the outer surfaces of the segments are formed flat. [8] A plurality of segments that are combined together to form a frustum-like overall shape and are divided about their central axis and disposed within a cylindrical can body member that forms a metal can; a wedge shaft that is disposed at the center of the plurality of segments and moves in the axial direction to move the plurality of segments radially outward; A mold for metal cans comprising: [9] The metal can mold according to [8], wherein the outer surfaces of the segments are formed flat. [Explanation of symbols]

[0060] 1...metal can, 11...side wall portion, 11A...can body member, 12...bottom lid, 21...tapered portion, 21a...molding surface, 21b...connecting surface, 22...cylindrical portion, 22a...flange, 23...curled portion, 23a...flange, 100...manufacturing apparatus, 101...mold, 111...movable mold, 112...wedge shaft, 112a...shaft portion, 112b...sliding portion, 113...drive device, 114...control device, 121...segment, 123...molding portion, 124...sliding portion, 125...holding portion.

Claims

1. a tapered sidewall portion having one end formed with a larger diameter than the other end and having a plurality of molding surfaces in a circumferential direction and a plurality of connecting surfaces continuous with the adjacent molding surfaces; a bottom cover provided at an end of the side wall portion on the small diameter side; A metal can comprising: The width of the molding surface in the circumferential direction is set to be larger than the width of the connecting surface in the circumferential direction, The side wall portion has a cylindrical portion at an end portion on the bottom lid side that is aligned along the axial direction of the side wall portion.

2. The metal can according to claim 1 , wherein the molding surface is formed into a flat surface.

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