JP7033857B2 - Bottle cans and bottle cans with caps - Google Patents

Description

The present invention relates to a bottle can that can prevent deformation of the neck portion due to a molding load during capping even when the can is made thinner, and a bottle can with a cap.

Conventionally, for example, bottle cans as shown in Patent Document 1 below are known.
The bottle can is made of an aluminum alloy material or the like and is formed in a bottomed tubular shape. The bottle can includes a can body which is a peripheral wall of the can and a can bottom which is a bottom wall of the can. The opening of the can body is a mouthpiece having a smaller diameter than the parts other than the opening (body and shoulder).

9 and 10 are vertical cross-sectional views taken along the can axis O direction in the vicinity of the base portion 101 of the conventional bottle can 100. The base portion 101 of the bottle can 100 is arranged adjacent to the screw portion 102 and below the screw portion 102, and bulges outward in the radial direction and extends over the entire circumference of the can shaft O. And a cylindrical neck portion 104 arranged adjacent to the lower portion of the bulge portion 103 and having a diameter smaller than that of the bulge portion 103.
After the inside of the bottle can 100 is filled with the contents such as a beverage, a ridged cylindrical cap 105 is attached to the base portion 101.

Specifically, as shown in FIG. 9, first, a cap 105 is put on the base portion 101, and a load (axial load) is applied downward from above the cap 105 by a pressure block (not shown) to seal the bottle can 100. Make it a state. In this sealed state, a screw-wound roll (not shown) is pressed inward in the radial direction against the peripheral wall of the cap 105 and rolled in the circumferential direction around the can shaft O to hit the peripheral wall of the cap 105. , A female screw shape that follows the male screw shape of the screw portion 102 is formed. Further, while applying a radial inward load (lateral load) to the lower end of the peripheral wall of the cap 105 by the hem winding roll 50, the hem winding roll 50 is rolled all around the can shaft O. The lower end of the peripheral wall of the cap 105 is hem-wound. As a result, as shown in FIG. 10, the lower end of the peripheral wall of the cap 105 is closely fitted to the bulging portion 103.

Japanese Unexamined Patent Publication No. 2004-276990

Conventional bottle cans have the following problems.
For this type of bottle can, there is a request for thinning for the purpose of reducing raw material costs. However, when the can is simply thinned, the neck portion may be deformed into an elliptical shape or the like in a cross-sectional view perpendicular to the can axis due to the forming load (axial load or lateral load) at the time of capping.

Further, in FIGS. 9 and 10, the hem winding roll 50 is strongly pressed against the neck portion 104 located below the lower end of the peripheral wall of the cap 105 in the mouthpiece portion 101, thereby becoming the starting point of the above deformation or the neck portion 104. Was sometimes crushed.
Specifically, the hem (lower end of the peripheral wall) of the cap 105 reaches the lower end of the bulging portion 103, and in order to surely wind the hem of the cap 105, the tip (outer circumference) of the hem winding roll 50 is attached to the neck 104 during capping. If the can must be pressed strongly and the can is thinned, the neck portion 104 cannot withstand this pressing force (lateral load) and may be deformed.

The present invention has been made in view of such circumstances, and is a bottle can that can prevent deformation of the neck due to a molding load during capping even when the can is made thinner, and a bottle with a cap. The purpose is to provide cans.

One aspect of the present invention is a bottomed tubular bottle can provided with a can body and a can bottom, and a base portion of the can body is arranged adjacent to a threaded portion and below the threaded portion and has a diameter. The bulging portion that bulges outward in the direction and extends over the entire circumference around the can axis, and the lower end of the peripheral wall of the ridged tubular cap attached to the base portion is in close contact with the hem, and the bulging portion. The bulging portion includes a neck portion adjacent to the lower portion of the portion, and the bulging portion has a convex curved portion having a curved shape that is convex outward in the radial direction in a vertical cross-sectional view including the can axis, and the convex portion. It has a straight line portion adjacent to the lower side of the curved line portion, and the straight line portion is inclined inward in the radial direction as it goes downward to form a straight line in the vertical cross-sectional view, and the neck portion is described. A minimum diameter portion having the smallest diameter in the neck portion and an inclined portion located above the minimum diameter portion and adjacent to the lower portion of the bulging portion and inclined inward in the radial direction toward the lower side. The inclined portion is extended diagonally downward from the lower end of the peripheral wall of the cap, and the inclined portion is located on an extension line of the straight portion or inside the extension line in the vertical cross-sectional view. The difference between the maximum outer diameter of the bulging portion and the minimum outer diameter of the neck portion is 2.5 to 10.0 mm .
Further, one aspect of the present invention includes a cap having a bottomed cylindrical bottle can having a can body and a can bottom, and a ridged tubular cap attached to the base portion of the can body. In a bottle can, the mouthpiece portion is arranged adjacent to the threaded portion below the threaded portion, bulges outward in the radial direction and extends over the entire circumference of the can axis, and the lower end of the peripheral wall of the cap is formed. A bulge portion that is tightly wound around the hem and a neck portion that is adjacently arranged below the bulge portion are provided, and the bulge portion is directed outward in the radial direction in a vertical cross-sectional view including the can shaft. It has a convex curved portion having a convex curved shape and a straight portion arranged adjacently below the convex curved portion, and the straight portion is inclined inward in the radial direction as it goes downward. It has a linear shape in the vertical cross-sectional view, and the neck portion is located above the minimum diameter portion having the smallest diameter in the neck portion and above the minimum diameter portion, and is arranged adjacently below the lower end of the peripheral wall of the cap and below. The inclined portion includes an inclined portion that inclines inward in the radial direction toward the inside, and the inclined portion extends diagonally downward from the lower end of the peripheral wall of the cap. It is located on the extension line of the straight line portion or inside the extension line , and the difference between the maximum outer diameter of the bulging portion and the minimum outer diameter of the neck portion is 2.5 to 10.0 mm. And.

According to the bottle can and the bottle can with a cap of the present invention, the base portion of the can body has an inclined portion, and the inclined portion is arranged adjacently below the bulging portion and fitted to the bulging portion. It is arranged adjacent to the lower end of the peripheral wall of the cap to be formed, and is formed so as to be inclined inward in the radial direction as it goes downward. That is, the neck portion adjacent to the lower portion of the bulging portion in the mouthpiece portion is not formed in a cylindrical shape parallel to the can axis as in the conventional case, but the neck portion of the present invention is gradually radially inward as it goes downward. It has a tapered slope that extends toward.
Then, in the vertical cross-sectional view of the bottle can, the inclined portion is arranged on the extension line of the lower end of the bulging portion or inside the extension line (inside the can, which may be paraphrased as the inside in the radial direction).

For this reason, at the time of capping, when the lower end of the peripheral wall of the cap is hem-wrapped around the bulge with the hem-wrapping roll, the inclined portion of the neck portion is inclined inward in the radial direction and escapes, so that the hem-wrapping roll with respect to the neck portion is used. The pressing force (lateral load) can be reduced or reduced to zero.
Specifically, even when the tip (outer circumference) of the hem winding roll is pressed against the inclined portion of the neck portion, the inclined portion causes the pressing force of the hem winding roll to be downward in the can axis direction other than the radial inner side. Etc. can be dispersed. Further, it is possible to prevent the hem winding roll from coming into contact with a portion of the neck other than the inclined portion (for example, a minimum diameter portion located below the inclined portion). Further, depending on the setting of the capper, it is possible to prevent the tip of the hem winding roll from coming into contact with the inclined portion of the neck portion. Therefore, due to these synergistic effects, the deformation of the neck can be effectively suppressed.

Here, the pressing force inward in the radial direction received from the hem-wrapping roll on the neck and the amount of deformation of the neck corresponding to the pressing force will be described. The amount of deformation of the neck (amount of change in radius) ΔR can be expressed by the following formula from the strength of materials.
ΔR = (R ² / tE) × P
Of the above formulas, P is the external pressure (the pressure that the neck receives from the hem winding roll inward in the radial direction), R is the radius of the neck (inner diameter), t is the thickness of the neck (thickness), and E is the Young's modulus. be. From the above equation, it can be seen that when the external pressure P, the thickness t, and the Young's modulus E are constant, the deformation amount ΔR of the neck portion is proportional to the square of the radius R of the neck portion. That is, if the radius R of the neck becomes smaller, the amount of deformation ΔR of the neck also becomes smaller in proportion to the square of the radius R (actually, when the radius R changes, the thickness t also changes slightly, but Since it is a minute amount, it will not be considered here).

In the present invention, the outer diameter of the neck portion is reduced by forming the inclined portion on the neck portion as described above. That is, since the radius R of the neck of the bottle can of the present invention is smaller than that of the conventional bottle can, even if the pressing force received from the hem winding roll is the same as the conventional one, the amount of deformation of the neck ΔR Is definitely reduced and deformation of the neck is prevented.

From the above, according to the bottle can and the bottle can with a cap of the present invention, even when the can is thinned, the neck portion is surely deformed by the molding load (axial load or lateral load) at the time of capping. Can be prevented.

Further , the difference between the maximum outer diameter of the bulging portion and the minimum outer diameter of the neck portion is 2.5 to 10.0 mm .

If the difference between the maximum outer diameter (diameter) of the bulging part and the minimum outer diameter (diameter) of the neck part is 2.5 mm or more, the length of the inclined part can be sufficiently secured, and the hem winding roll is attached to the neck part. It is possible to prevent a strong hit more reliably. Further, the radius R of the neck portion is sufficiently reduced, and the deformation amount ΔR of the neck portion can be stably suppressed to a small size.
Further, when the above difference is 10.0 mm or less, the moldability of the neck portion is well maintained. That is, for example, when the neck portion (inclined portion) is formed by die processing, it is possible to prevent cracks and the like caused by the sudden expansion of the diameter of the neck portion.
In order to make the above-mentioned action and effect even more remarkable, it is more preferable that the above difference is 3.0 to 7.0 mm.

Further, in the bottle can, it is preferable that the inclined portion is located on the extension line in the vertical cross-sectional view, and the angle at which the inclined portion is inclined with respect to the can axis is 36 to 50 °.

In a vertical cross-sectional view including the can shaft of a bottle can, if the angle at which the tilted portion is tilted with respect to the can shaft is 36 ° or more, the tilted portion is sufficiently tilted (laid down) and the hem roll. Can be more reliably prevented from hitting the neck strongly.
Further, in the above vertical cross-sectional view, if the angle at which the inclined portion is tilted with respect to the can axis is 50 ° or less, the inclined portion is tilted too much (being laid down too much), and the load bearing capacity of the neck portion (particularly the shaft). It is possible to prevent the load bearing capacity from being reduced.

Further, in the bottle can, in the vertical cross-sectional view, the inclined portion is located inside the extension line, and the angle at which the lower portion of the bulging portion is inclined with respect to the can axis is 36 to 50 °. It is preferable to have.

In a vertical cross-sectional view including the can shaft of a bottle can, if the angle at which the lower part of the bulge is tilted with respect to the can shaft is 36 ° or more, the lower part of the bulge is sufficiently tilted (laid down). The hem of the cap peripheral wall is surely wound, and the cap does not come off completely (upward detachment from the base).
Further, in the vertical cross-sectional view, if the angle at which the lower portion of the bulging portion is tilted with respect to the can axis is 50 ° or less, the lower portion of the bulging portion is tilted too much (too much to lie down) and swells. It is possible to prevent the load bearing capacity of the protruding portion (particularly the bearing capacity against the axial load) from being reduced.

Further, in the bottle can, the inclined portion may be linear in the vertical cross-sectional view.
Further, in the bottle can, the inclined portion may have a concave curved shape in the vertical cross-sectional view.

In the vertical cross-sectional view of the bottle can, the inclined portion may be appropriately formed in a straight line or a concave curve. When the inclined portion is formed in a straight line, it becomes easy to connect the inclined portion to the lower end of the bulging portion without a step, and when the inclined portion is formed in a concave curved shape, the moldability is further improved. ..

Further, in the bottle can, it is preferable that the bulging portion and the inclined portion are connected so as to be in contact with each other at the connecting portion in the vertical cross-sectional view.

In this case, it is easy to form the base portion, and it is possible to prevent the base portion from buckling and deforming starting from the connection portion between the bulging portion and the inclined portion. In addition, the appearance (aesthetics) of the base is good.

Further, in the bottle can with a cap, the distance from the lower end of the peripheral wall of the cap to the lower end of the inclined portion along the can axis direction is preferably 2 to 6 mm.

If the distance between the lower end of the peripheral wall of the cap and the lower end of the inclined portion in the can axis direction is 2 mm or more, it is possible to more reliably prevent the hem winding roll from hitting the neck portion (particularly the minimum diameter portion). This is because the thickness of the outer peripheral edge (flange portion) of the hem winding roll in the vertical direction is 2 mm or more.
Further, when the distance is 6 mm or less, it is possible to suppress a reduction in the axial load capacity of the inclined portion due to the inclined portion becoming too long.

Further, in the bottle can with a cap, a hem-wrapping roll mark extending around the can axis may be formed on the inclined portion.

When the hem roll comes into contact with the inclined portion during capping, a hem winding roll mark extending around the can axis is formed on the inclined portion. In the present invention, as described above, the pressing force of the hem-wrapping roll on the inclined portion can be suppressed to be small, so that the hem-wrapping roll marks can be made inconspicuous. And the deformation of the neck is also suppressed.

Further, in the bottle can with a cap, it may be assumed that the hem winding roll mark extending around the can axis is not formed on the entire neck portion including the inclined portion.

If the hem roll does not abut on the entire neck including the inclined portion during capping, no hem roll mark extending around the can axis is formed on the entire neck. If the hem-wrapping roll marks are not formed, the aesthetic appearance of the base can be enhanced. And the deformation of the neck is more surely prevented.

According to the bottle can and the bottle can with a cap of the present invention, even when the can is made thinner, it is possible to prevent the neck from being deformed due to the molding load during capping.

It is a vertical sectional view which shows the bottle can and the bottle can with a cap which concerns on one Embodiment of this invention. It is a vertical sectional view near the base portion of the bottle can and the bottle can with a cap which concerns on one Embodiment of this invention. It is a vertical sectional view near the base portion of the bottle can and the bottle can with a cap which concerns on one Embodiment of this invention. It is a vertical cross-sectional view which shows the vicinity of the base part before the cap hem winding molding of the bottle can (bottle can) with a cap which concerns on this embodiment in an enlarged manner. It is a vertical sectional view which enlarges and shows the vicinity of the base part after the cap hem winding molding of the bottle can (bottle can) with a cap which concerns on this embodiment. It is a vertical cross-sectional view which shows the vicinity of the base part before the cap hem winding molding of the bottle can (bottle can) with a cap which concerns on the modification of this embodiment enlarged. It is a vertical cross-sectional view which shows the vicinity of the base part after the cap hem winding molding of the bottle can (bottle can) with a cap which concerns on the modification of this embodiment enlarged. It is a vertical cross-sectional view which shows the vicinity of the base part after the cap hem winding molding of the bottle can (bottle can) with a cap which concerns on the modification of this embodiment enlarged. It is a vertical sectional view of the vicinity of the base portion of the conventional bottle can and the bottle can with a cap. It is a vertical sectional view of the vicinity of the base portion of the conventional bottle can and the bottle can with a cap.

Hereinafter, the bottle can 10 and the bottle can 20 with a cap according to the embodiment of the present invention will be described with reference to the drawings. The drawings used in the description of the present embodiment may be shown by enlarging, emphasizing, or excerpting the main parts in order to make the features of the present invention easy to understand, such as the dimensional ratio of each component. Is not always the same as the actual one.

The bottle can 10 is made of an alloy containing aluminum as a main component, for example, 3004 material or 3104 material. As shown in FIG. 1, in the present embodiment, as the bottle can 10, a bottle can having a total length (that is, the total height of the can) of about 133 mm along the can axis O direction, which is called "310B" size by those skilled in the art, is taken as an example. Listed. However, the present invention is not limited to this, and the bottle can 10 may be, for example, a bottle can having a total height of about 164 mm, which is called "410B" size by those skilled in the art.

The bottle can 10 is filled with contents such as beverages, and the cap 15 is attached to the base portion 5 of the can body 1, which will be described later, and is sealed to form a bottle can 20 with a cap. That is, the capped bottle can 20 has a bottomed tubular bottle can 10 and a ridged tubular cap 15 attached to the base 5 of the bottle can 10.

The bottle can 10 includes a can body 1 which is a peripheral wall of the can and a can bottom 2 which is a bottom wall of the can. The central axis of the can body 1, the central axis of the can bottom 2, and the central axis of the cap 15 are arranged coaxially with each other, and in the present embodiment, these common axes are referred to as the can axis O.
Further, the direction in which the can shaft O extends (the direction along the can shaft O) is referred to as the can shaft O direction. Of the can shaft O directions, the direction from the can bottom 2 toward the base 5 and the cap 15 of the can body 1 is referred to as upward, and the direction from the cap 15 and the base 5 toward the can bottom 2 is referred to as downward.
Further, the direction orthogonal to the can axis O is called the radial direction. Of the radial directions, the direction approaching the can axis O is referred to as the inside in the radial direction, and the direction away from the can axis O is referred to as the outside in the radial direction.
Further, the direction of orbiting around the can axis O is called the circumferential direction.

Unless otherwise specified, various shapes of the bottle can 10, such as "concave", "convex", "recessed", and "protruding", used in the present embodiment are the outer surface (outer surface of the can; externally) of the bottle can 10. It represents various shapes on the exposed surface).
Further, in the vertical cross-sectional view (longitudinal view including the can shaft O) of the bottle can 10 (bottle can 20 with a cap) shown in FIGS. 1 to 8 along the can axis O direction, the shape of each part of the bottle can 10 will be described. Unless otherwise specified, the line shapes such as "arc", "curve", "straight line", "tangent line", and "extension line" used in the can represent various line shapes on the outer surface of the bottle can 10.

In FIG. 1, the can bottom 2 is connected to an annular convex portion (rim) 11 that protrudes downward and extends along the circumferential direction in the radial direction of the annular convex portion 11, and is recessed upward. It is provided with a dome portion 12.
Further, the can body 1 has a body portion 3 connected to the can bottom 2, a shoulder portion 4 inclined inward in the radial direction from the body portion 3 upward, and a mouthpiece erected above the shoulder portion 4. It is provided with a part 5.

The body portion 3 is continuously provided on the outer peripheral edge portion of the annular convex portion 11 of the can bottom 2, and extends upward from the outer peripheral edge portion. The body portion 3 has a cylindrical shape having a substantially constant outer diameter along the can axis O direction. The body portion 3 is the maximum diameter portion of the can body 1, and the outer diameter of the body portion 3 is, for example, 65 to 67 mm.
The shoulder portion 4 is continuously provided above the body portion 3 and has a tapered shape that gradually reduces in diameter from the body portion 3 upward.

In FIGS. 1 to 5, the base portion 5 is continuously provided above the shoulder portion 4. The base portion 5 is the minimum diameter portion of the can body 1.
The base portion 5 is arranged adjacent to the threaded portion 6 and below the threaded portion 6, and the bulging portion 7 that bulges outward in the radial direction and extends over the entire circumference in the circumferential direction, and below the bulging portion 7. It includes a neck portion 8 arranged adjacent to each other and a curl portion 9 formed on the upper end opening edge of the base portion 5.

The threaded portion 6 is formed with a spiral male thread extending in the can axis O direction toward the circumferential direction.
The bulging portion 7 bulges outward in the radial direction and forms an annular shape extending along the circumferential direction. The bulging portion 7 is also called a turnip. The outer diameter of the bulging portion 7 is equal to or larger than the outer diameter of the threaded portion 6, and in the example of the present embodiment, it is larger than the outer diameter of the threaded portion 6. The maximum outer diameter (diameter) of the bulging portion 7 is, for example, about 38.0 mm. The maximum outer diameter of the bulging portion 7 corresponds to the bottle diameter. That is, the bottle can 10 of the present embodiment has a diameter of 38 mm.

As shown in FIGS. 3 and 5, the lower end of the peripheral wall of the cap 15 attached to the base portion 5 is hem-wound around the bulging portion 7. With the cap 15 attached to the base portion 5 and the peripheral wall of the cap 15 fitted to the radial outer side of the bulging portion 7, the lower end of the bulging portion 7 and the lower end of the peripheral wall of the cap 15 are mutually connected. They are placed in approximately the same position (approximately in agreement).

In the vertical cross-sectional view of the bottle can shown in FIGS. 4 and 5, the bulging portion 7 is arranged adjacently to the upward convex curved portion 16 arranged below the threaded portion 6 and adjacently below the upward convex curved portion 16. It has a middle-convex curve portion 17, a downward-convex curve portion 18 adjacently arranged below the middle-convex curve portion 17, and a straight portion 19 adjacently arranged below the downward-convex curve portion 18. In the vertical cross-sectional view of the bottle can, the upward convex curve portion 16, the medium convex curve portion 17, and the downward convex curve portion 18 all have a curved shape that is convex toward the outside in the radial direction, and have different radii of curvature from each other. There is. In the illustrated example, the radius of curvature of these convex curve portions is increased in the order of the downward convex curve portion 18, the upward convex curve portion 16, and the middle convex curve portion 17.

The upward convex curved portion 16 is connected to the lower end of the threaded portion 6 and is inclined outward in the radial direction as it goes downward. The medium-convex curved portion 17 is smoothly connected so as to be in contact with the lower end of the upward convex curved portion 16, and is inclined outward in the radial direction as it goes downward. The amount of radial displacement (that is, inclination) of the medium-convex curved portion 17 along the can axis O direction per unit length is smaller than the amount of displacement of the upward convex curved portion 16.

The downward convex curved portion 18 is smoothly connected so as to be in contact with the lower end of the medium convex curved portion 17, and is inclined inward in the radial direction as it goes downward. In the vertical cross-sectional view of the bottle can shown in FIG. 5, the radius of curvature r2 (on the outer surface of the can) of the downward convex curve portion 18 is 1.0 to 1.6 mm. The straight line portion 19 is smoothly connected so as to be in contact with the lower end of the downward convex curved portion 18, and is inclined inward in the radial direction as it goes downward. In the vertical cross-sectional view of the bottle can, the straight line portion 19 has a straight line shape.
In the present embodiment, as shown in FIG. 5, the lower end of the peripheral wall of the cap 15 is hem-wound with respect to the downward convex curved portion 18 and the straight portion 19 of the bulging portion 7.

In the vertical cross-sectional view of the bottle can shown in FIGS. 4 and 5, the neck portion 8 is arranged adjacent to the lower portion of the bulging portion 7, and the inclined portion 21 and the inclined portion 21 are inclined inward in the radial direction toward the lower side. It is provided with a concave curved portion 22 connected below the concave curved portion 22 and a minimum diameter portion 23 connected below the concave curved portion 22.

The inclined portion 21 is connected to the lower end of the bulging portion 7 (straight line portion 19), and has a tapered shape that gradually shrinks in diameter toward the lower side. Further, in the vertical cross-sectional view of the bottle can 10, the bulging portion 7 (lower part) and the inclined portion 21 are smoothly connected without a step so as to be in contact with each other at the connection portion (to have a common tangent line). There is.

In the present embodiment, the inclined portion 21 is formed so as to coincide with the extension line L of the lower portion of the bulging portion 7 in the vertical cross-sectional view including the can shaft O. That is, in the vertical cross-sectional view of the bottle can, the inclined portion 21 of the neck portion 8 is located on the extension line L of the lower end of the bulging portion 7, and is outside the extension line L (outside of the can, outside in the radial direction). ) Is not located.

In a vertical cross-sectional view of the bottle can 10 along the can axis O direction shown in FIGS. 2 and 3, the inclined portion 21 has a linear shape extending in an inclined direction in a direction intersecting the can axis O.
Further, in the vertical cross-sectional view of the bottle can 10, the angle θ at which the inclined portion 21 is inclined with respect to the can axis O is 36 to 50 °. In the illustrated example, the angle θ is about 43 °. In other words, in the vertical cross-sectional view of the bottle can, the angle (90 ° −θ) at which the inclined portion 21 is inclined with respect to the virtual straight line (not shown) orthogonal to the can axis O is about 47 °.
The angle θ in the present embodiment refers to the acute angle among the acute and obtuse angles formed between the can shaft O and the inclined portion 21 in the vertical cross-sectional view of the bottle can 10.

In the bottle can 20 with a cap shown in FIGS. 3 and 5, the inclined portion 21 is arranged adjacent to the lower end of the peripheral wall of the cap 15, and extends diagonally downward from the lower end of the peripheral wall of the cap 15. ing. In FIG. 5, the distance A from the lower end of the peripheral wall of the cap 15 to the lower end of the inclined portion 21 along the can axis O direction is 2 to 6 mm. Specifically, in the can axis O direction from the lowermost end including the plate thickness on the peripheral wall of the cap 15 to the lower end of the inclined portion 21 connected to the concave curved portion 22 (the connection point between the inclined portion 21 and the concave curved portion 22). The distance A is 2 to 6 mm. It is preferable that the distance A is set to be equal to or larger than the thickness of the hem winding roll 50 described later. That is, the thickness of the outer peripheral edge (flange portion) of the hem winding roll 50 in the vertical direction (roll tip vertical width) is at least 2 mm. Further, regarding the distance in the can axis O direction from the lower end of the bulging portion 7 (straight line portion 19) to the lower end of the inclined portion 21 (to the upper end of the concave curved portion 22), the plate thickness of the lower end of the peripheral wall of the cap 15 is taken into consideration. Then, it is 2.2 to 6.2 mm. In the present embodiment, the lower end of the bulging portion 7 (straight line portion 19) is defined as the position 7a where the tip of the hem of the peripheral wall of the cap 15 abuts, as shown in FIG.

The concave curved portion 22 has a concave curved surface shape that is recessed inward in the radial direction. The concave curved portion 22 is smoothly connected to the inclined portion 21 and the minimum diameter portion 23. In the vertical cross-sectional view of the bottle can shown in FIG. 5, the radius of curvature r1 of the concave curved portion 22 is 0.8 to 1.4 mm.

The minimum diameter portion 23 is the portion of the neck portion 8 having the smallest diameter. In the example shown in FIGS. 4 and 5, the minimum diameter portion 23 has a cylindrical shape extending parallel to the can axis O. Instead of this, as shown in FIGS. 2 and 3, the minimum diameter portion 23 may have a concave curved surface shape that is recessed inward in the radial direction.

The minimum outer diameter (diameter) of the minimum diameter portion 23, that is, the minimum outer diameter of the neck portion 8 is 28 to 35.5 mm. In the example of this embodiment, the minimum outer diameter of the neck portion 8 is set to about 32 mm. The difference between the maximum outer diameter (diameter) of the bulging portion 7 and the minimum outer diameter (diameter) of the neck portion 8 is 2.5 to 10.0 mm. Preferably, the above difference is 3.0 to 7.0 mm.
The thickness (thickness, plate thickness) of the minimum diameter portion 23 forming the minimum outer diameter of the neck portion 8 is, for example, 0.250 to 0.335 mm.

In the example of the present embodiment, the concave curved portion is continuous below the minimum diameter portion 23 in the neck portion 8, and the upper end portion of the shoulder portion 4 is connected below the concave curved portion. A step portion (not shown) may be provided between the neck portion 8 and the shoulder portion 4 for the purpose of increasing the buckling strength of the can.

The curl portion 9 is located at the upper end opening edge of the base portion 5. The tip (material end) of the curl portion 9 is folded back from the outer side in the radial direction to the lower side. The curl portion 9 has an annular shape extending along the circumferential direction. In the present embodiment, either the curl portion 9 or the neck portion 8 is the minimum diameter portion of the base portion 5. In the illustrated example, throttle processing (curl crushing processing) is performed inward in the radial direction over the entire circumference of the outer circumference of the curl portion 9, whereby the outer peripheral surface of the curl portion 9 is parallel to the can shaft O. It has a cylindrical surface shape.

Next, an example of the manufacturing process will be described with respect to the manufacturing method of the bottle can 10 and the bottle can 20 with a cap of the present embodiment.
The bottle can 10 includes a plate material punching process, a cupping process (squeezing process), a DI process (squeezing ironing process), a trimming process, a printing / painting (can outer surface) process, a painting (can inner surface) process, a necking process, a trimming process, and a screw. Cans are manufactured through a molding process, a curling process, a throttle process, and the like.

In the plate material punching process, a rolled material (plate material) made of an aluminum alloy material or the like is punched to form a disk-shaped blank.
In the cupping process (cupping process), the blank is drawn (cupping) by a cupping press to form a cup-shaped body having a bottomed cylinder.

In the DI process (squeezing and ironing process), the cup-shaped body is re-squeezed and ironed by a DI can manufacturing apparatus to form a bottomed tubular DI can having a can body and a can bottom. Note that "DI" is an abbreviation for Drawing & Ironing.
Further, in the DI step, the above-mentioned annular convex portion 11 and the dome portion 12 are press-molded on the bottom of the can.

In the DI can that has undergone the DI process, the open end of the can body has an uneven shape, so-called ears are formed, and the height is non-uniform. Therefore, a trimming device is used to trim the open end of the can body to obtain a DI can in which the height of the open end is evenly aligned over the entire circumference (trimming step).

Next, after washing the DI can to remove oil and the like, surface treatment is applied to dry the DI can, and the outer surface of the DI can is printed and painted (printing / painting (can outer surface) process), and the inner surface of the DI can is painted. (Painting (inner surface of can) process).
The outer surface of the DI can is printed and painted with an outer finish varnish. Printing and exterior finish painting are wet-on-wet, then baked and dried.
In addition, after the outer surface is painted, the inner surface is painted and its drying / baking is performed. The coating on the inner surface of the DI can is performed by spraying the paint from the opening of the can body toward the bottom of the can with a spray nozzle. By drying the sprayed paint, a coating film is formed on the inner surface of the can, and corrosion resistance is imparted.

This DI can is transferred to a bottle can manufacturing apparatus. In the bottle can manufacturing apparatus, the shoulder portion 4 and the base portion 5 are subjected to stepwise die processing (necking processing) in the vicinity of the opening of the can body by using a plurality of types of die processing tools (necking molding dies). (Necking process).
Specifically, the minimum diameter portion 23 of the shoulder portion 4 and the neck portion 8 is formed by gradually reducing the diameter in the vicinity of the opening of the can body by die processing. The concave curved portion 22 and the inclined portion 21 of the neck portion 8 and the lower portion of the bulging portion 7 (straight line portion 19, downward convex curved portion 18, etc.) are gradually enlarged in the vicinity of the opening of the can body by die processing. Mold.
In addition, if necessary, a trimming processing tool is used between a plurality of types of die processing to trim the open end portion having irregular heights (trimming process).

Next, a screw forming process is performed on the base portion 5 of the can body 1 using a thread forming processing tool (screw forming step). Further, the upper end opening of the base portion 5 is curled using a curl processing tool (curl process), and throttle processing (throttle process) is performed using a throttle processing tool (curl crushing processing tool). As a result, the screw portion 6 and the curl portion 9 are formed on the base portion 5. In addition, a plurality of die processing and trimming processing may be performed between the above-mentioned screw forming processing and curling processing.

As a result, the seamless integrally molded bottle can 10 as shown in FIG. 1 is produced.
In the example of this embodiment, the neck portion 8 of the base portion 5 is molded by using a die processing tool in the necking step. Instead of this, the neck portion 8 may be formed by using a rotary processing tool (a forming roller such as a core roller or an outer element roller) before and after the screw forming step.

In a process after the throttle process, the inside of the bottle can 10 is filled with contents such as beverages, and a cap 15 having a ridged cylinder is fitted to the base portion 5 by a capper (cap mounting device). Will be done. As a result, the bottle can 20 with a cap is manufactured.
Specifically, as shown in FIGS. 2 and 4, first, the cap 15 is put on the base portion 5, and a load (axial load) is applied downward from above the cap 15 by a pressure block (not shown), and then the cap 15 is applied. The sealing material provided on the lower surface of the top wall (top wall) of the bottle can 10 is pressed against the curl portion 9 of the base portion 5 from above to seal the bottle can 10. In this sealed state, a screw-wound roll (not shown) is pressed inward in the radial direction against the peripheral wall of the cap 15 and rolled in the circumferential direction around the can shaft O to form the peripheral wall of the cap 15. , A female screw shape that follows the male screw shape of the screw portion 6 is formed. Further, while applying a radial inward load (lateral load) to the lower end of the peripheral wall of the cap 15 by the hem winding roll 50, the hem winding roll 50 is rolled all around the can shaft O. The lower end of the peripheral wall of the cap 15 is hem-wound. As a result, as shown in FIGS. 3 and 5, the lower end of the peripheral wall of the cap 15 is closely fitted to (the lower part of) the bulging portion 7.
In this way, the cap 15 is attached to the base portion 5 in a state where the contents of the bottle can 10 are sealed. Further, this sealed state is maintained until the cap 15 is removed from the base portion 5 and the cap 15 is opened.

When the lower end of the peripheral wall of the cap 15 is hem-wound by the hem-wrapping roll 50, the tip of the hem-wrapping roll 50 (the flange portion on the outer periphery) may or may not be brought into contact with the inclined portion 21. good. When the hem winding roll 50 is brought into contact with the inclined portion 21, a hem winding roll mark (not shown) extending around the can shaft O is formed on the inclined portion 21. Further, when the hem winding roll 50 is not brought into contact with the entire neck portion 8 including the inclined portion 21, the hem winding roll mark is not formed on the entire neck portion 8.

According to the bottle can 10 and the bottle can 20 with a cap according to the above-described embodiment, the base portion 5 of the can body 1 has an inclined portion 21, and the inclined portion 21 is below the bulging portion 7. It is arranged adjacent to the cap 15 and adjacent to the lower end of the peripheral wall of the cap 15 fitted to the bulging portion 7, and is formed so as to be inclined inward in the radial direction toward the lower side. That is, the neck portion 8 adjacent to the lower side of the bulging portion 7 in the base portion 5 is not formed in a cylindrical shape parallel to the can axis O as in the conventional case, but the neck portion 8 of the present embodiment faces downward. A tapered inclined portion 21 that gradually extends inward in the radial direction is provided.
Then, in the vertical cross-sectional view of the bottle can, the inclined portion 21 is arranged on the extension line L of the lower end of the bulging portion 7. In the example of the present embodiment, the entire inclined portion 21 is located on the extension line L, and the inclined portion 21 is outside the extension line L of the bulging portion 7 over the entire area (outside of the can, outside in the radial direction). ) Does not swell.

Therefore, at the time of capping, when the lower end of the peripheral wall of the cap 15 is hem-wrapped around the bulging portion 7 (lower part) by the hem-wrapping roll 50, the inclined portion 21 of the neck portion 8 is inclined inward in the radial direction and escapes. The pressing force (lateral load) from the hem winding roll 50 on the neck portion 8 can be reduced or reduced to zero.
Specifically, even when the tip (outer circumference) of the hem winding roll 50 is pressed against the inclined portion 21 of the neck portion 8, the inclined portion 21 causes the pressing force of the hem winding roll 50 to be applied to other than the inside in the radial direction. Can be dispersed downward in the O direction of the can axis. Further, it is possible to prevent the hem winding roll 50 from coming into contact with a portion of the neck portion 8 other than the inclined portion 21 (a concave curved portion 22 located below the inclined portion 21, a minimum diameter portion 23, etc.). Further, depending on the setting of the capper, it is possible to prevent the tip of the hem winding roll 50 from coming into contact with the inclined portion 21 of the neck portion 8. Therefore, the deformation of the neck 8 can be effectively suppressed by these synergistic effects.

Here, the pressing force applied to the neck portion 8 from the hem winding roll 50 inward in the radial direction and the amount of deformation of the neck portion 8 corresponding to the pressing force will be described. The amount of deformation (change amount of radius) ΔR of the neck portion 8 can be expressed by the following formula from the strength of materials.
ΔR = (R ² / tE) × P
In the above formula, P is the external pressure (pressure received from the hem winding roll 50 toward the inside in the radial direction), R is the radius (inner diameter) of the neck 8, t is the thickness (thickness) of the neck 8, and E. Is Young's modulus. From the above equation, it can be seen that when the external pressure P, the thickness t, and the Young's modulus E are constant, the deformation amount ΔR of the neck portion 8 is proportional to the square of the radius R of the neck portion 8. That is, if the radius R of the neck portion 8 becomes smaller, the deformation amount ΔR of the neck portion 8 also becomes smaller in proportion to the square of the radius R (actually, when the radius R changes, the thickness t also changes slightly. However, since it is a minute amount, it will not be considered here).

In the present embodiment, the outer diameter of the neck portion 8 is reduced by forming the inclined portion 21 on the neck portion 8 as described above. That is, since the radius R of the neck 8 of the bottle can 10 of the present embodiment shown in FIGS. 1 to 5 is smaller than that of the conventional bottle can 100 shown in FIGS. 9 and 10, the hem winding roll is tentatively used. Even if the pressing force received from 50 is the same as in the conventional case, the deformation amount ΔR of the neck portion 8 is surely reduced, and the deformation of the neck portion 8 is prevented.

From the above, according to the bottle can 10 and the bottle can 20 with a cap of the present embodiment, the neck portion 8 is deformed by the molding load (axial load or lateral load) at the time of capping even when the can is thinned. Can be reliably prevented.

Further, in the present embodiment, the difference between the maximum outer diameter (diameter) of the bulging portion 7 and the minimum outer diameter (diameter) of the neck portion 8 including the inclined portion 21 is 2.5 to 10.0 mm. It plays the action effect of.
That is, as in the above configuration, if the difference between the maximum outer diameter of the bulging portion 7 and the minimum outer diameter of the neck portion 8 is 2.5 mm or more, the length of the inclined portion 21 can be sufficiently secured and the hem winding roll. It is possible to more reliably prevent the 50 from hitting the neck 8 strongly. Further, the radius R of the neck portion 8 is sufficiently reduced, and the deformation amount ΔR of the neck portion 8 can be stably suppressed to a small value.
Further, when the above difference is 10.0 mm or less, the moldability of the neck portion 8 is well maintained. That is, when the neck portion 8 (inclined portion 21) is formed by die processing as described in the present embodiment, it is possible to prevent cracks and the like caused by the sudden expansion of the diameter of the neck portion 8.
In order to make the above-mentioned action and effect even more remarkable, it is more preferable that the above difference is 3.0 to 7.0 mm.

Further, in the present embodiment, the angle θ at which the inclined portion 21 is tilted with respect to the can axis O is 36 to 50 ° in the vertical cross-sectional view of the bottle can 10 along the can axis O direction. Play.
That is, as in the above configuration, if the angle θ at which the inclined portion 21 is tilted with respect to the can shaft O is 36 ° or more in the vertical cross-sectional view including the can shaft O of the bottle can 10, the tilted portion 21 is sufficiently tilted. It is possible to more reliably prevent the hem-wrapping roll 50 from hitting the neck 8 strongly when it is made to lie down.
Further, in the vertical cross-sectional view, if the angle θ at which the inclined portion 21 is tilted with respect to the can axis O is 50 ° or less, the inclined portion 21 is tilted too much (too much laid down) and the neck portion 8 is tilted too much. It is possible to prevent the load bearing capacity (particularly the bearing capacity against the axial load) from being reduced.

Further, in the present embodiment, since the inclined portion 21 is formed in a straight line in the vertical cross-sectional view of the bottle can 10, it is easy to connect the inclined portion 21 to the lower end (straight line portion 19) of the bulging portion 7 without a step. ..

Further, in the present embodiment, in the vertical cross-sectional view of the bottle can 10, the bulging portion 7 and the inclined portion 21 are connected so as to be in contact with each other at the connecting portion, so that the base portion 5 can be easily formed and the bulging portion 5 can be easily formed. It is possible to prevent the base portion 5 from buckling and deforming starting from the connection portion between the protruding portion 7 and the inclined portion 21. In addition, the appearance (aesthetic appearance) of the base portion 5 is good.

Further, in the present embodiment, the distance A from the lower end of the peripheral wall of the cap 15 to the lower end of the inclined portion 21 along the can axis O direction is 2 to 6 mm, so that the following effects are obtained.
That is, as in the above configuration, if the distance A in the can axis O direction between the lower end of the peripheral wall of the cap 15 and the lower end of the inclined portion 21 is 2 mm or more, the hem winding roll 50 is the neck portion 8 (particularly the minimum diameter portion 23). ) Can be prevented more reliably. This is because the thickness of the outer peripheral edge (flange portion) of the hem winding roll 50 in the vertical direction is 2 mm or more.
Further, when the distance A is 6 mm or less, it is possible to suppress a decrease in the withstand load of the inclined portion 21 due to the inclined portion 21 becoming too long.
Further, in the bottle can 10 before the cap 15 is attached, the distance in the can axis O direction from the lower end 7a of the bulging portion 7 to the lower end of the inclined portion 21 is 2.2 to 6.2 mm, so that the same operation as described above is performed. The effect is obtained.

Further, in the present embodiment, when the hem winding roll 50 comes into contact with the inclined portion 21 during capping, a hem winding roll mark extending around the can shaft O is formed on the inclined portion 21. In the present embodiment, as described above, the pressing force of the hem winding roll 50 on the inclined portion 21 can be suppressed to a small value, so that the hem winding roll marks can be made inconspicuous. And the deformation of the neck 8 is also suppressed.

Further, in the present embodiment, when the hem winding roll 50 does not abut on the entire neck portion 8 including the inclined portion 21 during capping, the hem winding roll mark extending around the can shaft O is not formed on the entire neck portion 8. If the hem-wrapping roll marks are not formed, the aesthetic appearance of the base portion 5 can be enhanced. And the deformation of the neck portion 8 is more reliably prevented.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, for example, as described below.

In the above-described embodiment, the neck portion 8 includes an inclined portion 21, a concave curved portion 22, a minimum diameter portion 23, and a concave curved portion adjacent below the minimum diameter portion 23. Not limited to. That is, the neck portion 8 may be provided with at least an inclined portion 21 that inclines inward in the radial direction as it goes downward, and the portion other than the inclined portion 21 has a shape other than the shape described in the above-described embodiment. You may.

Further, in the above-described embodiment, the inclined portion 21 has a linear shape in the vertical cross-sectional view of the bottle can 10 along the can axis O direction, and the inclined portion 21 is an extension line L of the lower end of the bulging portion 7. Although it is said to be located above, it is not limited to this.
6 and 7 show modified examples of the bottle can 10 and the capped bottle can 20 described in the above-described embodiment. In this modification, the inclined portion 24 of the neck portion 8 adjacent to the lower portion of the bulging portion 7 has a concave curved shape in a vertical cross-sectional view including the can shaft O. That is, the inclined portion 24 has a concave curved surface shape that is recessed toward the inside (inward in the radial direction) of the can.
The inclined portion 24 is located inside the extension line L at the lower end of the bulging portion 7 (inside the can, inside in the radial direction) in the vertical cross-sectional view of the bottle can. In this modification, the entire inclined portion 24 is located inside the extension line L, and the inclined portion 24 is outside the extension line L of the bulging portion 7 (outside the can, radially outside) over the entire area. ) Does not swell.
Further, in this vertical cross-sectional view, the angle at which the lower portion (straight line portion 19) of the bulging portion 7 is inclined with respect to the can axis O is preferably 36 to 50 °. The angle refers to an acute angle among the acute and obtuse angles formed between the can shaft O and the lower portion of the bulging portion 7 in the vertical cross-sectional view of the bottle can.

In this modification, the neck portion 8 includes an inclined portion 24 and a minimum diameter portion 23 smoothly connected below the inclined portion 24, and the above-mentioned above-mentioned is provided between the inclined portion 24 and the minimum diameter portion 23. The concave curved portion 22 described in the embodiment is not provided.
Further, in FIG. 7, the distance A from the lower end of the peripheral wall of the cap 15 to the lower end of the inclined portion 24 (the connection portion with the minimum diameter portion 23) along the can axis O direction is 2 to 6 mm. Further, the distance from the lower end 7a of the bulging portion 7 to the lower end of the inclined portion 24 along the can axis O direction is 2.2 to 6.2 mm.

Also in the modified examples shown in FIGS. 6 and 7, the same action and effect as those of the above-described embodiment can be obtained. In this case, it is possible to make it more difficult for the tip of the hem winding roll 50 to come into contact with the inclined portion 24. Further, in the vertical cross-sectional view of the bottle can, the inclined portion 24 is formed in a concave curved shape, so that the moldability is further improved.

Further, in the vertical cross-sectional view of the bottle can 10, since the angle at which the lower portion of the bulging portion 7 is tilted with respect to the can axis O is 36 ° or more, the lower portion of the bulging portion 7 is sufficiently tilted (sleeping). The hem of the peripheral wall of the cap 15 is surely wound, and the cap 15 is not completely pulled out (upward detachment from the base portion 5).
Further, in the vertical cross-sectional view, since the angle at which the lower portion of the bulging portion 7 is tilted with respect to the can axis O is 50 ° or less, the lower portion of the bulging portion 7 is tilted too much (too much to lie down). ), It is possible to prevent the load bearing capacity of the bulging portion 7 (particularly the bearing capacity against the axial load) from being reduced.

Further, in the vertical cross-sectional view including the can shaft O, instead of the above-mentioned linear inclined portion 21 and concave curved inclined portion 24, for example, the extension line L of the lower end of the bulging portion 7 is not crossed outward. As described above, an inclined portion having a convex curved shape may be used. In this case, the inclined portion has a convex curved surface shape that swells toward the outside (diametrically outside) of the can.
Alternatively, in the vertical cross-sectional view of the bottle can, for example, an inclined portion having a composite shape in which any two or more of a straight line, a concave curve and a convex curve are combined may be used.

FIG. 8 is another modification of the bottle can 10 and the capped bottle can 20 described in the above-described embodiment. In the modified example shown in FIG. 8, in the vertical cross-sectional view of the bottle can, at least a part of the inclined portion 24 is on the extension line L of the lower end of the bulging portion 7 or inside the extension line L (inside of the can, in the radial direction). It is located on the inside). In the illustrated example, the upper end portion of the inclined portion 24 connected to at least the lower portion of the bulging portion 7 is located inside the extension line L.

Specifically, in this modification, in the vertical cross-sectional view of the bottle can shown in FIG. 8, the upper end portion of the inclined portion 24 has a concave curved shape, the lower end portion has a convex curved shape, and the upper end portion and the lower end portion are The middle part located between them forms a straight line. The lower end portion and the intermediate portion (lower portion) of the inclined portion 24 are located outside the extension line L (outside the can, outside in the radial direction). That is, the inclined portion 24 is not located on the extension line L of the bulging portion 7 or inside the extension line L over the entire area, but also in this modification, the above-described embodiment and FIGS. 6 and 6 It is possible to obtain the same action and effect as the modification shown in 7.

Further, in the above-described embodiment and modification, the straight line portion 19 is arranged at the lower end of the bulging portion 7 in the vertical cross-sectional view of the bottle can, and the inclined portion 21 with respect to the extension line L of the straight line portion 19. Although it is assumed that the 24s coincide with each other or are arranged inside, a convex curved portion may be arranged at the lower end of the bulging portion 7 instead of the straight portion 19. In this case, the extension line L at the lower end of the bulging portion 7 refers to a tangent line at the connection point (boundary point, inflection point) between the bulging portion 7 and the inclined portions 21 and 24 (the tangent line is at least bulging). It is a tangent line tangent to the lower end of the convex curved portion of the protruding portion 7).

Further, in the above-described embodiment, in the vertical cross-sectional view of the bottle can 10, the bulging portion 7 and the inclined portion 21 are connected so as to be in contact with each other at the connecting portion, but the present invention is limited to this. is not it. For example, in the vertical cross-sectional view of the bottle can 10, the inclination angle of the lower portion (straight line portion 19) of the bulging portion 7 with respect to the can axis O and the inclination angle (angle θ) of the inclined portion 21 may be different from each other. ..

Further, in the above-described embodiment, the bottle can 10 having a diameter of 38 mm, in which the maximum outer diameter (diameter) of the bulging portion 7 of the base portion 5 is set to about 38.0 mm, has been described as an example, but the present invention is limited to this. It is not something that is done. That is, the present invention can be applied to, for example, a bottle can having a maximum outer diameter (diameter) of about 33.0 mm or 28.0 mm in the bulging portion of the base portion, and bulging between 28 mm and 38 mm. It may be a part diameter.

Further, in the above-described embodiment, an example in which the can body 1 and the can bottom 2 are integrally formed as the bottle can 10 has been described, but in the bottle can 10, the can body 1 and the can bottom 2 are separate. It may be formed on the body and a combination of these.

In addition, as long as it does not deviate from the gist of the present invention, each configuration (component) described in the above-described embodiments, modifications, and notes may be combined, and additions, omissions, substitutions, and the like of the configurations may be combined. It can be changed. Further, the present invention is not limited by the above-described embodiments, but is limited only by the scope of claims.

The bottle can and the bottle can with a cap of the present invention can prevent deformation of the neck portion due to a molding load during capping even when the can is thinned. Therefore, it has industrial applicability.

1 Can body 2 Can bottom 5 Mouthpiece 6 Threaded part 7 Swelling part 7a Lower end of bulging part 8 Neck part 10 Bottle can 15 Cap 19 Straight part (lower part of bulging part)
20 Bottle cans with caps 21, 24 Inclined parts A Distance L Extension line O Can axis θ Angle

Claims (10)

A bottomed cylindrical bottle can with a can body and a can bottom.
The base of the can body is
Threaded part and
Adjacent to the lower part of the threaded portion, it bulges outward in the radial direction and extends over the entire circumference of the can axis, and the lower end of the peripheral wall of the ridged cylindrical cap attached to the base portion is in close contact with the hem. The bulge to be rolled up and
With a neck located adjacent to the bottom of the bulge,
The bulge is
In the vertical cross-sectional view including the can axis, a convex curved portion having a curved shape that is convex toward the outside in the radial direction, and a convex curved portion.
It has a straight line portion adjacent to the lower side of the convex curve portion, and has.
The straight line portion is inclined inward in the radial direction as it goes downward, and forms a straight line in the vertical cross-sectional view.
The neck is
The smallest diameter part of the neck and the smallest diameter part
It is provided with an inclined portion located above the minimum diameter portion and adjacent to the lower portion of the bulging portion, and inclined inward in the radial direction toward the lower side.
The inclined portion extends diagonally downward from the lower end of the peripheral wall of the cap.
In the vertical cross-sectional view, the inclined portion is located on an extension line of the straight portion or inside the extension line.
A bottle can in which the difference between the maximum outer diameter of the bulging portion and the minimum outer diameter of the neck portion is 2.5 to 10.0 mm . The bottle can according to claim 1 .
In the vertical cross-sectional view, the inclined portion is located on the extension line, and the angle at which the inclined portion is inclined with respect to the can axis is 36 to 50 °. The bottle can according to claim 1 .
A bottle can in which the inclined portion is located inside the extension line in the vertical cross-sectional view, and the angle at which the straight portion of the bulging portion is inclined with respect to the can axis is 36 to 50 °. The bottle can according to any one of claims 1 to 3 .
A bottle can in which the inclined portion is linear in the vertical cross-sectional view. The bottle can according to any one of claims 1 to 3 .
A bottle can in which the inclined portion has a concave curved shape in the vertical cross-sectional view. The bottle can according to any one of claims 1 to 5 .
A bottle can in which the bulging portion and the inclined portion are connected so as to be in contact with each other at a connection portion in the vertical cross-sectional view. A bottomed cylindrical bottle can with a can body and a can bottom,
A bottle can with a cap provided with a ridged cylindrical cap attached to the base of the can body.
The mouthpiece is
Threaded part and
A bulging portion that is adjacent to the lower part of the threaded portion, bulges outward in the radial direction, extends over the entire circumference of the can axis, and the lower end of the peripheral wall of the cap is in close contact with the hem.
With a neck located adjacent to the bottom of the bulge,
The bulge is
In the vertical cross-sectional view including the can axis, a convex curved portion having a curved shape that is convex toward the outside in the radial direction, and a convex curved portion.
It has a straight line portion adjacent to the lower side of the convex curve portion, and has.
The straight line portion is inclined inward in the radial direction as it goes downward, and forms a straight line in the vertical cross-sectional view.
The neck is
The smallest diameter part of the neck and the smallest diameter part
It is provided with an inclined portion located above the minimum diameter portion and adjacent to the lower end of the peripheral wall of the cap, and inclined inward in the radial direction toward the lower side.
The inclined portion extends diagonally downward from the lower end of the peripheral wall of the cap.
In the vertical cross-sectional view, the inclined portion is located on an extension line of the straight portion or inside the extension line.
A bottle can with a cap in which the difference between the maximum outer diameter of the bulging portion and the minimum outer diameter of the neck portion is 2.5 to 10.0 mm . The bottle can with a cap according to claim 7 .
The neck portion has a concave curved surface shape that is recessed inward in the radial direction, and has a concave curved portion that smoothly connects the inclined portion and the minimum diameter portion.
A bottle can with a cap in which the distance from the lower end of the peripheral wall of the cap to the connection point between the inclined portion and the concave curved portion along the can axis direction is 2 to 6 mm. The bottle can with a cap according to claim 7 or 8 .
A bottle can with a cap in which a hem-wrapping roll mark extending around the can axis is formed on the inclined portion. The bottle can with a cap according to claim 7 or 8 .
A bottle can with a cap in which a hem-wrapping roll mark extending around the can axis is not formed on the entire neck portion including the inclined portion.

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