JP2018184187A - Bottle can and bottle can with cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottle can and a bottle can with a cap which are capable of maintaining a buckling strength of a can body at a conventional level or stronger despite having thinner walls.SOLUTION: A bottle can 1 has a bottomed cylindrical shape having a can barrel and a can bottom, with the can barrel comprising a barrel part connected to the can bottom, a shoulder part 6 which becomes smaller in diameter as it extends upward from the barrel part, and a mouth part 7 which extends upward from the shoulder part 6. The mouth part 7 comprises: a screw part 11; a coupler part 12 which is disposed below and adjacent to the screw part 11 and is bulged outwardly in the radial direction; and a flange-like protruded part 13 which is disposed between the coupler part 12 and the shoulder part 6, protruded outwardly in the axial direction and extending in the circumferential direction. The distance B, along the axis direction of the can, between the bottom edge 16 of the coupler part 12 and an apex part 20, which is located at the outermost part of the protruded part 13 in the radial direction, is 5 mm or shorter.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bottle can and a bottle can with a cap that can increase the buckling strength of the can body even if the wall thickness is reduced.

Conventionally, for example, bottle cans as shown in Patent Documents 1 to 3 below are known.
A bottle can consists of aluminum alloy materials etc., and is formed in a bottomed cylinder shape. The bottle can includes a can body that is a peripheral wall of the can and a can bottom that is a bottom wall of the can. The can body has a body portion that is the largest diameter portion connected to the can bottom, a shoulder portion that gradually decreases in diameter from the body portion toward the upper side (opening end side along the can axis direction), and the shoulder portion upward. A mouth portion extending toward the head. The mouth portion includes a screw portion and a turnip portion that is disposed adjacent to the screw portion (can bottom side along the can axis direction) and bulges outward in the radial direction.

  After the inside of the bottle can is filled with contents such as a beverage, a cap is attached to the mouth. At this time, the lower end portion of the peripheral wall of the cap is locked to the turnip portion. In other words, the cap portion prevents the cap from being pulled out or loosened.

JP 2006-196332 A JP 2003-205924 A Japanese Patent No. 3561696

By the way, in recent years, there has been a demand for reducing the thickness of the bottle can from the viewpoint of reducing raw materials and environmental protection such as CO ₂ emission reduction.
However, in the conventional bottle can, it is difficult to ensure the buckling strength when the thickness is reduced. Specifically, when attaching a cap to the mouth of a bottle can, a load in the can axis direction (axial load), a radial load perpendicular to the can axis (lateral load), an internal pressure, etc. are applied. The bottle can could be greatly deformed or buckled.

  The present invention has been made in view of such circumstances, and a bottle can that can maintain the buckling strength of the can body as usual or higher even when the wall thickness is reduced, and a bottle with a cap The purpose is to provide cans.

One aspect of the present invention is a bottomed cylindrical bottle can having a can body and a can bottom, wherein the can body is connected to the can bottom, and as it goes upward from the body portion. A shoulder portion having a reduced diameter and a mouth portion extending upward from the shoulder portion, the mouth portion being disposed adjacent to a screw portion and the screw portion, and bulging outward in the radial direction. A caulb portion, and a hook-shaped convex portion disposed between the cabula portion and the shoulder portion, projecting radially outward and extending in the circumferential direction, and a lower end of the cabra portion, A distance along the can axis direction between the convex portion and the top portion positioned on the outermost radial direction is 5 mm or less.
Moreover, the bottle can with a cap according to one embodiment of the present invention is characterized in that a cap is attached to the mouth portion of the bottle can described above.

  As a result of intensive research on the buckling strength of the bottle can, the inventor of the present invention, as one cause of the buckling strength reduction, (in the cross section) of the elliptical deformation near the drinking mouth (mouth) It has been found that the influence is great, and increasing the strength (or rigidity) at a position close to the drinking mouth is effective in suppressing buckling.

  Therefore, in the present invention, a flange-like convex portion that protrudes outward in the radial direction and extends in the circumferential direction is provided between the turnip portion and the shoulder portion in the mouth portion. Specifically, the top part located most radially outside among these convex parts is arranged in the range of 5 mm or less along the can axis direction from the lower end of the turnip part. That is, since the convex portion is arranged close to the turnip portion and the screw portion adjacent to the upper portion, the strength of the screw portion and the turnover portion can be reliably increased, and as a result, the buckling deformation of the can body can be reduced. It can be effectively suppressed.

Unlike the present invention, when the distance along the can axis direction between the lower end of the cabra part and the top part of the convex part located on the outermost radial direction exceeds 5 mm, the screw part and the caulb part Since the convex portions cannot be disposed close to each other, the buckling deformation suppressing effect of the can body cannot be sufficiently obtained. Therefore, it is difficult to meet the demand for thinning.
On the other hand, according to the present invention, the buckling strength of the can body can be kept as usual or higher even if the wall thickness is reduced.

  The bottle can preferably includes a plurality of concave arc portions that connect the convex portions and the shoulder portions between the convex portions and the shoulder portions in a longitudinal sectional view along the can axis. .

In the above configuration, in the longitudinal cross-sectional view of the bottle can, a plurality of concave arc portions are formed between the convex portions and the shoulder portions, and the convex portions and the shoulder portions are connected via these concave arc portions. Yes. Thereby, there exists the following effect.
That is, in this case, since the curvature radii of the plurality of concave arc portions can be made different from each other, for example, a long distance along the can axis direction between the convex portion and the shoulder portion can be secured by the concave arc portion having a large curvature radius. Accordingly, the distance in the can axis direction between the convex portion and the turnip portion can be shortened, and the above-described effects of the present invention become more remarkable.
Further, the concave arc portion having a small curvature radius makes it easy to ensure a large amount of protrusion of the convex portion toward the radially outer side, and the strength against axial and radial loads can be improved.

  Further, in the bottle can, a first connecting portion connecting the first concave arc portion and the convex portion, which are adjacently disposed below the convex portion among the plurality of concave arc portions, and the plurality of concave arcs. The distance along the can axis direction between the second concave arc portion adjacently disposed above the shoulder portion and the second connection portion connecting the shoulder portion among the portions is 3 mm or more. preferable.

  In this case, since the distance along the can axis direction between the first connection portion located at the lower end of the convex portion and the second connection portion located at the upper end of the shoulder portion is 3 mm or more, the convex portion and the shoulder portion Can be ensured a long distance along the can axis direction, and accordingly, the distance between the convex portion and the turnip portion in the can axis direction can be shortened, and the above-described effects of the present invention are more remarkable. It will be something.

  Moreover, it is preferable that the said bottle can was equipped with the linear part which connects the said concave circular arc parts between several said concave circular arc parts by the longitudinal cross-sectional view along a can axis | shaft.

  In this case, in the longitudinal cross-sectional view of the bottle can, a plurality of concave arc portions and a linear portion connecting the concave arc portions are formed between the convex portion and the shoulder portion. By providing the straight portion, it becomes easy to ensure a long distance along the can axis direction between the convex portion and the shoulder portion, and accordingly, the distance in the can axis direction between the convex portion and the turnip portion can be shortened. Thus, the above-described operational effects of the present invention can be obtained stably.

  Moreover, in the bottle can, the distance along the radial direction between the top of the convex portion and the portion located radially inward between the convex portion and the shoulder is from 0.6 mm. Larger is preferred.

  In this case, since the protruding amount of the protruding portion protruding outward in the radial direction from the portion located most radially inward between the protruding portion and the shoulder portion is larger than 0.6 mm, the protruding portion can The buckling strength of the body can be reliably and significantly increased.

  Moreover, the said bottle can WHEREIN: It is preferable that the said convex part has a some convex arc part by the longitudinal cross-sectional view along a can axis | shaft.

In the above configuration, a plurality of convex arc portions are formed in the convex portion in the longitudinal cross-sectional view of the bottle can. Thereby, there exists the following effect.
That is, in this case, since the radii of curvature of the plurality of convex arc portions can be made different from each other, for example, the convex portion (the top portion) is arranged close to the cabra portion in the can axis direction by the convex arc portion having a small curvature radius. This makes it easier to obtain the above-described effects of the present invention more stably. In addition, the convex arc portion having a small radius of curvature makes it easy to ensure a large amount of protrusion of the convex portion radially outward in a predetermined region in the can axis direction, thereby improving the strength against axial and radial loads. Can be planned.

Further, the convex arc portion having a large radius of curvature can ensure a large length along the can axis direction of the convex portion, and the effect of improving the buckling strength by the convex portion can be exhibited in a wide range in the can axis direction. it can.
Further, by forming a convex arc portion having a large radius of curvature on the outer surface of the bottle can, a concave arc portion having a large radius of curvature is formed on the inner surface of the bottle can. For this reason, at the time of manufacturing the can, when the paint is sprayed on the inner surface of the can after forming the mouth portion, the inner surface paint can be easily poured on the inner surface of the can of the convex portion (the back surface of the convex portion). The paint state on the inner surface of the can is stabilized. In addition, when forming a coating film by spraying paint on the inner surface of the can before forming the mouth portion, a concave arc portion having a large curvature radius is formed on the inner surface of the convex portion at the time of forming the convex portion. Therefore, it is possible to suppress a problem that the coating film is peeled off from the concave arc portion. Moreover, in the bottle can of a product, the malfunction that the contents, such as a drink, accumulate in the recessed part formed in the can inner surface of a convex part can be prevented.

  Moreover, the said bottle can WHEREIN: It is preferable that the said convex part has a linear part which connects several said convex circular arc parts by the longitudinal cross-sectional view along a can axis | shaft.

In this case, in the longitudinal sectional view of the bottle can, a plurality of convex arc portions and straight portions connecting the convex arc portions are formed in the convex portion. By providing the straight portion, it becomes easy to ensure a large length along the can axis direction of the convex portion, and the effect of improving the buckling strength by the convex portion can be obtained in a wide range in the can axis direction.
In addition, when the can is manufactured at the time of forming the mouth part, the paint is sprayed on the inner surface of the can to form a coating film because the straight part is formed and the length of the convex part in the can axis direction is increased. The inner surface paint can be easily poured on the inner surface of the can (the back surface of the convex portion) (easy to spread over the entire surface), and the coating state on the inner surface of the can is stabilized. In addition, when forming a coating film by spraying paint on the inner surface of the can before forming the mouth portion, the concave portion formed on the inner surface of the convex portion can be bent slightly when forming the convex portion. It is possible to prevent such a problem that the coating film is peeled off. Moreover, in the bottle can of a product, the malfunction that the contents, such as a drink, accumulate in the recessed part formed in the can inner surface of a convex part can be suppressed.
The straight portion may be inclined with respect to the can shaft, and in this case, the length along the radial direction of the convex portion (the amount of protrusion toward the outer side in the radial direction) can be further ensured. The strength against the load in the direction and the radial direction can be improved.

  Moreover, the said bottle can WHEREIN: It is preferable that the length along the can axial direction of the said convex part is 1.5-8 mm.

  In the above configuration, since the length of the convex portion in the can axis direction is 1.5 mm or more, when forming a coating film by spraying the inner surface of the can after forming the mouth portion, the convex portion The inner surface paint can be easily poured on the inner surface of the can (the back surface of the convex portion) (easy to spread over the entire surface), and the coating state on the inner surface of the can is stabilized. In addition, when forming a coating film by spraying paint on the inner surface of the can before forming the mouth portion, the concave portion formed on the inner surface of the convex portion can be bent slightly when forming the convex portion. It is possible to prevent such a problem that the coating film is peeled off. Moreover, in the bottle can of a product, the malfunction that the contents, such as a drink, accumulate in the recessed part formed in the can inner surface of a convex part can be suppressed.

  Moreover, since the length of the convex portion in the can axis direction is 8 mm or less, the overall length of the convex portion in the can axis direction is prevented from becoming too long, and the convex portion ensures the buckling strength of the can body. Can be increased. Further, for example, in order to ensure a long overall length of the convex portion in the can axis direction, the position of the shoulder portion is not lowered, and the content capacity can be prevented from being reduced.

  In the bottle can, it is preferable that the upper end portion of the convex portion is provided with a tapered portion that is inclined upward as it goes radially inward.

In this case, since the taper part formed in the upper end part of a convex part inclines upwards as it goes to radial direction inner side, there exists the following effect.
That is, for example, a purchaser of a bottle can tilts the bottle can with the mouth portion obliquely downward, and after the contents such as a beverage are poured out from the mouth portion, the contents are formed on the inner surface of the convex portion (the back surface of the convex portion). ) Can be prevented from accumulating in the recess formed. That is, since the contents can easily flow out from the inside of the concave portion, the contents can be prevented from accumulating in the mouth portion and being noticed.

  Further, in the bottle can, the top portion of the convex portion is in the radial direction with respect to any one of the portion located on the outermost radial direction in the turnable portion and the portion located on the outermost radial direction in the screw portion. It is preferable to arrange on the outside.

  In this case, the top portion of the convex portion is disposed on the radially outer side with respect to the turnip portion or the screw portion. As described above, the top of the convex portion is not arranged at the same position (directly below) in the radial direction with respect to the turnip portion and the screw portion, so that the buckling strength is improved particularly with respect to the load in the can axis direction. be able to.

  Moreover, the said bottle can WHEREIN: It is preferable that the plate | board thickness of the said convex part is 0.3 mm or less.

  In this case, since the plate | board thickness of a convex part is 0.3 mm or less, thickness reduction as the whole bottle can can be achieved sufficiently. And even if it thins in this way, according to this invention, the buckling strength of a can can be improved stably. In addition, Preferably, the plate | board thickness of a convex part is 0.290 mm or less, Even in this case, the buckling strength of a can is ensured in this invention.

  According to the bottle can and the bottle can with a cap of the present invention, the buckling strength of the can body can be maintained as usual or higher even when the wall thickness is reduced.

It is a half longitudinal section showing a bottle can concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which expands and shows the opening | mouth part vicinity of a bottle can. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a modification of the bottle can which concerns on one Embodiment of this invention, and is a longitudinal cross-sectional view which expands and shows the opening | mouth part vicinity of this bottle can. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which expands and shows the opening | mouth part vicinity of the bottle can of a reference example. It is a principal part enlarged view of FIG.

  Hereinafter, a bottle can 1 according to an embodiment of the present invention will be described with reference to the drawings. Note that the drawings used in the description of the present embodiment may show enlarged, emphasized, and excerpted portions that are essential parts in order to make the features of the present invention easier to understand. Is not always the same as the actual one.

The bottle can 1 is an aluminum bottle formed with an aluminum alloy material as a main component. As shown in FIG. 1, in this embodiment, as a bottle can 1, a bottle can called a “410B” size by a person skilled in the art, whose total length along the can axis C direction (that is, the total height of the can) is about 164 mm is taken as an example. Cite. However, the present invention is not limited to this, and the bottle can 1 may be, for example, a bottle can called a “310B” size by a person skilled in the art whose total height is about 133 mm.
The bottle can 1 is filled with a content such as a beverage, and a cap (not shown) is attached to the mouth portion 7 of the can body 3 to be described later and sealed to form a bottle can with a cap.

The bottle can 1 has a bottomed cylindrical shape, and includes a can body 3 that is a peripheral wall of the can and a can bottom 2 that is a bottom wall of the can. The central axis of the can body 3 and the central axis of the can bottom 2 are arranged coaxially with each other. In the present embodiment, these common axes are referred to as a can axis C.
The direction in which the can axis C extends (the direction along the can axis C) is referred to as the can axis C direction. Of the direction of the can axis C, the direction from the bottom 2 to the opening end (mouth 7 to be described later) of the can body 3 is referred to as upward, and the direction from the opening end (mouth 7) toward the bottom 2 is downward. That's it.
A direction perpendicular to the can axis C is referred to as a radial direction. Of the radial directions, the direction approaching the can axis C is referred to as the inside in the radial direction, and the direction away from the can axis C is referred to as the outside in the radial direction.
Further, a direction around the can axis C is referred to as a circumferential direction.

Various shapes such as “concave”, “convex”, “depressed”, “projecting” and the like of the bottle can used in this embodiment are the outer surface of the bottle can (external surface of the can. Exposed outside) unless otherwise specified. Various shapes on the surface).
Moreover, in the longitudinal sectional view along the can axis C of the bottle can shown in FIGS. 1 to 7 (including the can axis C), “arc”, “curve”, “straight line” used for explanation of each shape of the bottle can. Unless otherwise specified, the line shape such as “tangent” represents various line shapes on the outer surface of the bottle can.

In FIG. 1, a can bottom 2 protrudes downward and extends along the circumferential direction, and is continuously provided on the inner side in the radial direction of the annular protrusion 10, and is recessed upward. And a dome portion 9.
The can body 3 includes a body portion 5 connected to the can bottom 2, a shoulder portion 6 whose diameter decreases from the body portion 5 toward the upper side, and a mouth portion 7 that extends upward from the shoulder portion 6. ing.

The trunk | drum 5 is provided in a row by the outer peripheral part of the cyclic | annular convex part 10 of the can bottom 2, and is extended toward upper direction from this outer peripheral part. The trunk | drum 5 has comprised the cylindrical shape made into the substantially constant outer diameter along the can-axis C direction. The trunk | drum 5 is a largest diameter part in the can trunk | drum 3, and the outer diameter of the trunk | drum 5 is 65-67 mm, for example.
The shoulder 6 is connected to the upper side of the trunk 5 and gradually decreases in diameter from the trunk 5 toward the upper side, and has a tapered shape.

  1 to 3, the mouth portion 7 is continuously provided above the shoulder portion 6. The mouth portion 7 is a minimum diameter portion in the can body 3. The mouth portion 7 is disposed adjacent to the screw portion 11, below the screw portion 11, and to the cab portion 12 that bulges outward in the radial direction, between the cab portion 12 and the shoulder portion 6. A flange-shaped convex portion 13 that protrudes outward and extends in the circumferential direction, a linear portion 14 that is located between the turnable portion 12 and the convex portion 13 and extends in the can axis C direction, and an upper end opening of the mouth portion 7 And a curled portion 15 formed at the edge.

  The screw portion 11 is formed with a helical male screw extending in the direction of the can axis C as it goes in the circumferential direction. The outer diameter of the thread located at the upper end of the screw part 11 is slightly smaller than the outer diameter of the thread located at a part other than the upper end. In the nominal φ38 caliber bottle can, the outer diameter (maximum outer diameter) of the screw portion 11 is, for example, 36.7 to 37.3 mm.

  The turnip portion 12 has an annular shape that bulges outward in the radial direction and extends along the circumferential direction. In the longitudinal cross-sectional view of the bottle can 1 shown in FIGS. 2 and 3, the turnip portion 12 has a substantially trapezoidal shape (a trapezoid whose upper base is located at the radially outer end). The outer diameter of the turnable portion 12 is equal to or greater than the outer diameter of the screw portion 11. The Cabra part 12 may be called a skirt part, a bead part, etc. as another name.

The upper end portion of the turnable portion 12 is formed in a taper shape that is inclined inward in the radial direction as it goes upward, and is disposed close to the lower end of the screw portion 11. The lower end portion of the turnable portion 12 is formed in a taper shape that is inclined inward in the radial direction as it goes downward, and is connected to the upper end of the straight portion 14.
In the longitudinal cross-sectional view of the bottle can 1 shown in FIG. 3, the lower end portion of the turnable portion 12 is provided with a convex curve portion extending downward from the maximum diameter portion of the turnable portion 12 and continuously below the convex curve portion. And a concave curve portion. In the present embodiment, the lower end of the concave curve portion is the lower end 16 of the turnip portion 12.

  An intermediate portion located between the upper end portion and the lower end portion of the turnable portion 12 has a cylindrical shape substantially parallel to the can shaft C. Specifically, in the longitudinal sectional view of the bottle can 1, the intermediate portion of the turnable portion 12 has a convex curve shape that bulges outward in the radial direction. Moreover, in the example shown by FIG. 3, the intermediate part of the turnip part 12 inclines slightly toward radial inside as it goes upwards.

  The straight portion 14 is connected to the lower end 16 of the turnable portion 12, has a cylindrical shape centered on the can shaft C, and extends parallel to the can shaft C. The outer diameter of the straight portion 14 is smaller than the outer diameter of the turnip portion 12. Below the straight line portion 14, the convex portion 13 is arranged close to the straight portion 14.

  In FIG. 2, the curled portion 15 is located at the upper end opening edge of the mouth portion 7, and the tip (material end) thereof is folded back from the radially outer side downward. The curled portion 15 has an annular shape extending along the circumferential direction. The curled portion 15 has the smallest diameter at the mouth portion 7. In the example of the present embodiment, the entire circumference of the curled portion 15 is subjected to a throttle process (curl crushing process) directed radially inward.

  The convex portion 13 has a hook shape that protrudes radially outward from the straight portion 14 and extends along the circumferential direction. In the example of this embodiment, the convex part 13 has comprised the cyclic | annular form extended along the circumferential direction. The plate | board thickness of the convex part 13 is 0.3 mm or less, for example, Preferably, it is 0.290 mm or less.

In the longitudinal sectional view of the bottle can 1 shown in FIG. 3, the convex portion 13 has one convex arc portion 17. In the illustrated example, the convex arc portion 17 has a semicircular shape that is convex outward in the radial direction.
The length A along the can axis C direction of the convex portion 13 is 1.5 to 8 mm. In the present embodiment, “the length A of the convex portion 13 along the can axis C direction” is along the can axis C direction between the uppermost end and the lowermost end of the convex arc portion 17 of the convex portion 13. Refers to distance.

  In a longitudinal sectional view shown in FIG. 3, a linear portion 18 extending along the radial direction is continuously provided on the radially inner side of the upper end of the convex arc portion 17. Further, a concave arc portion 19 that extends upward as it goes inward in the radial direction is continuously provided on the radially inner side of the linear portion 18. The upper end of the concave arc portion 19 is connected to the lower end of the linear portion 14.

  And the distance B along the can-axis C direction between the lower end 16 of the turnip part 12 and the top part 20 located most radially outside among the convex parts 13 is 5 mm or less. Further, the distance B is 2.5 mm or more.

  As shown in FIG. 2 and FIG. 3, in the present embodiment, with respect to any one of the portion located on the outermost radial direction in the turnable portion 12 and the portion located on the outermost radial direction in the screw portion 11, The top part 20 of the convex part 13 is arrange | positioned at radial direction outer side. In the illustrated example, the top portion 20 of the convex portion 13 is disposed on the radially outer side with respect to both the outermost diameter portion of the turnable portion 12 and the outermost diameter portion of the screw portion 11.

  In a longitudinal sectional view shown in FIG. 3, a plurality of concave arc portions 21 and 22 that connect the convex portion 13 and the shoulder portion 6 are formed between the convex portion 13 and the shoulder portion 6. In the example of the present embodiment, among the plurality of concave arc portions 21 and 22, the first concave arc portion 21 located at the uppermost position and the second concave arc portion 22 located at the lowermost position in the can axis C direction. Connected directly. Specifically, in the longitudinal sectional view, the first concave arc portion 21 extends downward as it goes radially inward, and the second concave arc portion 22 faces radially outward as it goes downward. It extends.

  Further, in this longitudinal sectional view, the radii of curvature of the plurality of concave arc portions 21 and 22 are different from each other. That is, the radius of curvature of the first concave arc portion 21 and the radius of curvature of the second concave arc portion 22 are different from each other. In the illustrated example, the radius of curvature of the second concave arc portion 22 located below the first concave arc portion 21 among the plurality of concave arc portions 21 and 22 is increased. Yes.

In this longitudinal cross-sectional view, the connection part which connects the 1st concave arc part 21 adjacently arrange | positioned below the convex part 13 among the several concave arc parts 21 and 22 and the convex part 13 (the lower end) is 1st. Called 1 connection section 31. Moreover, the 2nd connection part 32 connects the connection part which connects the 2nd concave arc part 22 adjacently arrange | positioned above the shoulder part 6 among the some concave arc parts 21 and 22 and the shoulder part 6 (the upper end). Call it. In the present embodiment, the distance E along the can axis C direction between the first connection portion 31 and the second connection portion 32 is 3 mm or more.
Moreover, in this longitudinal cross-sectional view, the distance F along the radial direction between the apex 20 of the convex portion 13 and the most radially inner portion between the convex portion 13 and the shoulder 6 is 0.6 mm. Greater than.

Next, an example of a manufacturing process is demonstrated about the manufacturing method of the bottle can 1 of this embodiment.
The bottle can 1 includes a plate material punching process, a cupping process (drawing process), a DI process (drawing and 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 made through a molding process, a curling process, a throttle process, and the like.

In the plate material punching step, 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 step (drawing step), the blank is drawn (cupping) by a cupping press and formed into a cup-shaped body.

In the DI process (squeezing and ironing process), the cup-shaped body is redrawn and ironed by a DI can manufacturing device to form a bottomed cylindrical DI can having a can body and a can bottom. “DI” is an abbreviation for “Drawing & Ironing”.
In the DI process, the above-described dome portion 9 and annular convex portion 10 are press-molded on the bottom of the can.

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

Next, the DI can is washed to remove oil, etc., then surface-treated and dried, 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) process).
As described above, the shoulder portion 6 and the mouth portion 7 are formed in the vicinity of the opening end portion of the can body 3 of the bottle can 1 that has been made, but in the example of the present embodiment, the shoulder portion 6 and A case where the mouth portion 7 is formed after the printing / painting (can outer surface) step and the painting (can inner surface) step will be described. However, the coating (can inner surface) step may be performed after the shoulder portion 6 and the mouth portion 7 are formed.

Printing and exterior finish coating are performed on the outer surface of the DI can. Printing and exterior finish painting are baked and dried at the same time. When molding the shoulder part 6 and the mouth part 7, a strong load acts on the coating film, and if the coating film is not sufficiently baked, it will affect the opening performance. For example, it is set higher than a two-piece can comprising a can body and a can lid.
In addition, after the outer surface coating, the inner surface coating and its drying / baking are performed. The coating on the inner surface of the DI can is performed by spraying paint from the opening end 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 to impart corrosion resistance.

  This DI can is transferred to a bottle can manufacturing apparatus. In the bottle can manufacturing apparatus, a plurality of types of die processing tools (necking molds) are used to perform die processing (necking processing) stepwise on the open end of the can body and in the vicinity thereof, and the shoulder 6 and The mouth 7 is formed (necking process). Further, if necessary, a trimming process is performed between the plurality of types of die processing using the trimming processing tool on the opening end portion where the heights are not uniform (trimming step). Thereby, the bottle can 1 which has the shoulder part 6 and the mouth part 7 in the can body 3 is molded.

Next, the mouth 7 of the can body 3 is subjected to screw forming using a screw forming tool (screw forming step). Further, the mouth portion 7 is subjected to curling processing using a curling tool (curling process) and subjected to throttle processing (throttle processing) using a throttle processing tool (curling crushing processing tool). Thereby, the screw part 11 and the curl part 15 are formed in the mouth part 7.
In the present embodiment, the turnable portion 12 and the convex portion 13 of the mouth portion 7 are formed using a die processing tool in the necking step. However, the convex portion 13 may be formed using a rotary processing tool (forming rollers such as a core roller and an outer roller) before and after the screw forming step.
Thereby, the bottle can 1 as shown in FIG. 1 is manufactured.

In a step after the throttle step, the inside of the bottle can 1 is filled with contents such as beverages, and a cap (not shown) having a top-like cylindrical shape is attached to the mouth portion 7 of the bottle can 1.
Specifically, a cap is put on the mouth portion 7 of the bottle can 1 and the cap is pressed downward against the mouth portion 7 by a pressure block. Thereby, the sealing material provided on the lower surface of the top wall (top wall) of the cap is pressed against the curled portion 15 of the mouth portion 7 from above, and the bottle can 1 is sealed. In this sealed state, a threaded roller is pressed against the circumferential wall of the cap in the radial direction while being pressed radially inward, thereby forming a female thread shape following the male thread shape of the threaded portion 11 on the circumferential wall. Further, the lower end portion of the peripheral wall is engaged with the turnable portion 12 by rolling the skirt winding roller in the radial direction while pressing the bottom winding roller radially inward. Thereby, a cap is attached to the mouth part 7 in a state where the contents of the bottle can 1 are sealed. This sealed state is maintained until the cap is removed from the mouth 7 and opened.

The effects of the bottle can 1 and the bottle can with cap according to the present embodiment described above are as follows.
As a result of intensive studies on the buckling strength of the bottle can 1, the inventor of the present invention has an elliptical shape in the vicinity of the drinking mouth (mouth) 7 (in the cross section) as one cause of the buckling strength reduction. The influence of deformation is large, and the inventors have found that increasing the strength (or rigidity) at a position close to the drinking mouth portion 7 is effective in suppressing buckling.

  Therefore, in the present embodiment, a flange-like convex portion 13 that protrudes radially outward and extends in the circumferential direction is provided between the turnable portion 12 and the shoulder portion 6 in the mouth portion 7. Specifically, as shown in FIG. 3, the top portion 20 located on the outermost radial direction of the convex portion 13 has a range of 5 mm or less along the can axis C direction from the lower end 16 of the turnable portion 12 (that is, the distance). B is 5 mm or less). Thus, since the convex part 13 is arrange | positioned close to the screw part 11 and the screw part 11 adjacent on the upper direction, the intensity | strength of the screw part 11 or the screw part 12 can be raised reliably, As a result, The buckling deformation of the can body can be effectively suppressed.

Unlike this embodiment, when the distance B along the can axis C direction between the lower end 16 of the turnable portion 12 and the top portion 20 located on the outermost radial direction among the convex portions 13 exceeds 5 mm, Since the convex portion 13 cannot be disposed close to the screw portion 11 and the turnable portion 12, the effect of suppressing the buckling deformation of the can body cannot be sufficiently obtained. Therefore, it is difficult to meet the demand for thinning.
On the other hand, according to the present embodiment, the structural rigidity of the mouth portion 7 can be reliably increased, so that deformation of the mouth portion 7 can be effectively reduced (or suppressed) even if the thickness is reduced. And this embodiment can keep the buckling strength of a can body as usual or more, even if it thins.

Here, the effect of the buckling strength improvement by the bottle can 1 of this embodiment is demonstrated concretely using the bottle can 100 of the reference example shown by FIG.6 and FIG.7.
In this reference example, a cylindrical portion 101 having a diameter larger than that of the straight portion 14 is formed between the turnip portion 12 and the shoulder portion 6 instead of the flange-shaped convex portion 13. Further, the distance (shortest distance) B along the can axis C direction between the lower end 16 of the turnip portion 12 and the top portion 102 located on the outermost radial direction of the tubular portion 101 exceeds 5 mm.

With respect to the bottle can 1 of the present embodiment and the bottle can 100 of the reference example, the buckling load was confirmed by the buckling eigenvalue analysis. The configurations other than those described above (the diameter and thickness of the mouth portion 7 (not shown)) were the same as each other, and ABAQUS was used as the analysis software.
As a result, it was confirmed that the buckling strength of the can body of the bottle can 1 of this embodiment is improved by, for example, about 25% with respect to the bottle can 100 of the reference example.

  In order to make the above-described effects of the present embodiment more remarkable, the distance B is preferably 5 mm or less. In addition, when the can is manufactured, when the lower end portion of the peripheral wall of the cap is skirt-wound-molded into the turnip portion 12, the distance B is 2.5 mm from the viewpoint of surely preventing interference between the skirt winding roller and the convex portion 13. The above is preferable.

Moreover, in this embodiment, in the longitudinal cross sectional view of the bottle can 1, a plurality of concave arc portions 21 and 22 are formed between the convex portion 13 and the shoulder portion 6, and the concave arc portions 21 and 22 are interposed therebetween. Thus, the convex portion 13 and the shoulder portion 6 are connected. Thereby, there exists the following effect.
That is, in this case, since the curvature radii of the plurality of concave arc portions 21 and 22 can be made different from each other as described in the present embodiment, for example, the convex portion 13 and the shoulder portion by the concave arc portion 22 having a large curvature radius. The distance along the direction of the can axis C can be ensured for a long time, and the above-described effects of the present embodiment become more remarkable.
In addition, the concave arc portion 21 having a small radius of curvature makes it easy to ensure a large amount of protrusion 13 protruding outward in the radial direction, and the strength against axial and radial loads can be improved.

  In the present embodiment, the distance E along the can axis C direction between the first connecting portion 31 located at the lower end of the convex portion 13 and the second connecting portion 32 located at the upper end of the shoulder portion 6 is 3 mm or more. Therefore, a long distance along the can axis C direction between the convex portion 13 and the shoulder portion 6 can be secured, and the distance between the convex portion 13 and the turnable portion 12 in the can axis C direction can be shortened accordingly. Thus, the operational effects of the present embodiment described above become more remarkable.

  Further, in the present embodiment, the distance F along the radial direction between the top 20 of the convex 13 and the most radially inner portion between the convex 13 and the shoulder 6 is from 0.6 mm. Since it is large, the buckling strength of the can can be reliably and significantly increased by the convex portion 13.

  Moreover, in this embodiment, since the length A along the can axis C direction of the convex portion 13 is 1.5 mm or more, at the time of manufacturing the can, after forming the mouth portion 7, a paint is sprayed on the inner surface of the can to coat the coating film. In the case of forming, the inner surface paint can be easily poured on the inner surface of the can of the convex portion 13 (the back surface of the convex portion 13) (easy to spread throughout), and the coating state on the inner surface of the can is stabilized. In addition, when the paint is sprayed on the inner surface of the can before forming the mouth portion 7, the concave portion formed on the inner surface of the can of the convex portion 13 is bent slightly when the convex portion 13 is formed. Therefore, it is possible to prevent a problem that the coating film is peeled off from the concave portion. Moreover, in the bottle can 1 of a product, the malfunction that contents, such as a drink, accumulate in the recessed part formed in the can inner surface of the convex part 13 can be suppressed.

  Further, since the length A of the convex portion 13 in the can axis C direction is 8 mm or less, the shoulder portion 6 is lowered in order to ensure a long overall length of the convex portion 13 in the can axis C direction, and the capacity of the contents is reduced. It is possible to prevent it from being reduced.

  Moreover, in this embodiment, the top part 20 of the convex part 13 is arrange | positioned with respect to the turnip part 12 or the screw part 11 on the radial direction outer side. As described above, the top portion 20 of the convex portion 13 is not arranged at the same position (directly below) in the radial direction with respect to the turnable portion 12 and the screw portion 11, so that it is buckled particularly with respect to the load in the can axis C direction. The strength can be improved.

  Moreover, in this embodiment, since the plate | board thickness of the convex part 13 is 0.3 mm or less, thickness reduction as the whole bottle can 1 can fully be aimed at. And even if it thins in this way, according to this embodiment, the buckling strength of a can can be raised stably. In addition, Preferably, the plate | board thickness of the convex part 13 is 0.290 mm or less, Even in this case, the buckling strength of a can is ensured in this embodiment.

  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-mentioned embodiment, the convex part 13 has comprised the cyclic | annular form which followed the perimeter. Instead of this, a plurality of convex portions 13 may be provided at intervals in the circumferential direction.
Moreover, although the plate | board thickness of the convex part 13 was 0.3 mm or less, it is not limited to this, The plate | board thickness of the convex part 13 may exceed 0.3 mm.
In addition, in the longitudinal sectional view of the bottle can 1, the example in which the two concave arc portions 21 and 22 are provided between the convex portion 13 and the shoulder portion 6 has been described, but there are three or more concave arc portions. It may be provided.
Moreover, although the example where the can body 3 and the can bottom 2 were integrally formed was described as the bottle can 1, the bottle can 1 has the can body 3 and the can bottom 2 formed separately. May be combined.

  4 and 5 show a modification of the bottle can 1 described in the above embodiment. In this modification, detailed description of the same components and manufacturing processes as those of the above-described embodiment will be omitted, and different points will be mainly described below.

  In this modification, in the longitudinal sectional view along the can axis C of the bottle can 1 shown in FIGS. 4 and 5, it protrudes outward in the radial direction between the turnable portion 12 and the shoulder portion 6 and in the circumferential direction. A bowl-shaped convex portion 23 extending in the direction is formed. In the longitudinal sectional view shown in FIG. 4, the convex portion 23 includes a plurality of convex arc portions 41 and 42 and a linear portion 43 that connects the plurality of convex arc portions 41 and 42 to each other.

  Of the plurality of convex arc portions 41, 42, the uppermost first convex arc portion 41 and the lowermost second convex arc portion 42 are indirectly in the can axis C direction via the straight line portion 43. Connected. In this longitudinal sectional view, the first convex arc portion 41 extends radially outward as it goes downward, and the second convex arc portion 42 extends radially inward as it goes downward. The curvature radii of the convex arc portions 41 and 42 may be the same or different from each other. In the illustrated example, the linear portion 43 extends in the vertical direction parallel to the can axis C.

  The length A along the can axis C direction of the convex portion 23 is 1.5 to 8 mm. In this modification, “the length A along the can axis C direction of the convex portion 23” means the first convex arc portion 41 located at the uppermost position among the plurality of convex arc portions 41 and 42 of the convex portion 23. Is the distance along the can axis C direction between the upper end of the second convex arc portion 42 located at the lowermost position.

  Further, the distance B along the can axis C direction between the lower end 16 of the turnip portion 12 and the top portion 24 located on the most radially outer side of the convex portion 23 is 5 mm or less. In the illustrated example, the top portion 24 is located on the straight portion 43 parallel to the can axis C. In this case, the distance B is defined by the lower end 16 of the turnable portion 12 and the uppermost end of the top portion 24. The distance in the direction of the can axis C (that is, the shortest distance).

Further, a tapered portion 25 that is inclined upward as it goes inward in the radial direction is formed at the upper end portion of the convex portion 23. The tapered portion 25 is continuously provided from the upper end of the first convex arc portion 41 toward the radially inner side. On the radially inner side of the taper portion 25, a concave arc portion 26 that extends upward as it goes radially inward is continuously provided. The upper end of the concave arc portion 26 is connected to the lower end of the linear portion 14.
Moreover, the taper part 27 which inclines below is formed in the lower end part in the convex part 23 as it goes to radial inside. The tapered portion 27 is continuously provided from the lower end of the second convex arc portion 42 toward the radially inner side. A first concave arc portion 21 is continuously provided on the radially inner side of the tapered portion 27.

Also in the modified examples described above, the same operational effects as those of the above-described embodiment can be obtained.
Further, in this modification, a plurality of convex arc portions 41 and 42 are formed on the convex portion 23 in the longitudinal sectional view of the bottle can 1. Thereby, there exists the following effect.
That is, in this case, since the radii of curvature of the plurality of convex arc portions 41 and 42 can be made different from each other, for example, the convex portion 23 (the top portion 24) of the convex portion 23 with respect to the turnable portion 12 by the convex arc portion 41 having a small curvature radius. Can be placed closer to the can axis C direction, and the effects of the above-described embodiment can be obtained more stably. Further, the convex arc portion 41 or 42 having a small radius of curvature makes it easy to secure a large amount of protrusion of the convex portion 23 toward the radially outer side in a predetermined region in the can axis C direction. The strength can be improved.

Moreover, the convex arc part 41 or 42 with a large curvature radius can ensure the length A along the can-axis C direction of the convex part 23 large, and the convex part 23 becomes easy to shape | mold.
Further, by forming a convex arc portion having a large curvature radius on the outer surface of the bottle can 1, a concave arc portion having a large curvature radius is formed on the inner surface of the bottle can 1. For this reason, at the time of manufacturing the can, when the paint is sprayed on the inner surface of the can after forming the mouth portion 7, the inner surface paint can be easily poured on the inner surface of the can of the convex portion 23 (the back surface of the convex portion 23). (Easy to spread throughout), and the coating state on the inner surface of the can is stabilized. In addition, when the paint is sprayed on the inner surface of the can before forming the mouth portion 7, a concave arc portion having a large curvature radius is formed on the inner surface of the can of the convex portion 23 when forming the convex portion 23. By doing so, it is possible to suppress a problem that the coating film is peeled off from the concave arc portion. Moreover, in the bottle can 1 of a product, the malfunction that the contents, such as a drink, accumulate in the recessed part formed in the can inner surface of the convex part 23 can be prevented.

Moreover, since the convex part 23 has the linear part 43 which connects several convex circular arc parts 41 and 42 by the longitudinal cross-sectional view in alignment with the can axis | shaft C, there exists the following effect.
That is, in this case, in the longitudinal sectional view of the bottle can 1, the convex portion 23 is formed with a plurality of convex arc portions 41 and 42 and a linear portion 43 connecting the convex arc portions 41 and 42 to each other. By providing the straight portion 43, it becomes easy to ensure a large length A along the can axis C direction of the convex portion 23, and the effect of improving the buckling strength by the convex portion 23 is wide in the can axis C direction. Can be obtained at
Further, since the straight part 43 is formed and the length A of the convex part 23 in the direction of the can axis C is increased, the paint is sprayed on the inner surface of the can after forming the mouth part 7 at the time of manufacturing the can to form a coating film. In this case, it is possible to make the inner surface paint easily flow on the inner surface of the can of the convex portion 23 (the back surface of the convex portion 23) (easy to spread throughout), and the coating state on the inner surface of the can is stabilized. In addition, when the paint is sprayed on the inner surface of the can before forming the mouth portion 7, the concave portion formed on the inner surface of the can of the convex portion 23 is bent slightly when the convex portion 23 is formed. Therefore, it is possible to prevent a problem that the coating film is peeled off from the concave portion. Moreover, in the bottle can 1 of a product, the malfunction that the contents, such as a drink, accumulate in the recessed part formed in the can inner surface of the convex part 23 can be suppressed.
In addition, the linear part 43 may incline and extend with respect to the can axis C, and in this case, a larger length along the radial direction of the convex part 23 (a protruding amount toward the radially outer side) is ensured. It is possible to improve the strength against axial and radial loads. In this case, in order to keep the distance B small, it is preferable that the straight portion 43 is inclined radially inward as it goes downward.
Moreover, the some convex circular arc parts 41 and 42 may be directly connected, without providing the linear part 43. FIG.

Moreover, since the taper part 25 formed in the upper end part of the convex part 23 inclines upwards as it goes to radial direction inner side, there exists the following effect.
That is, for example, after the purchaser of the bottle can 1 tilts the bottle can 1 with the mouth portion 7 facing obliquely downward and pours the content such as a beverage from the mouth portion 7, the content is the inner surface of the convex portion 23. It is possible to suppress such a problem that it accumulates in the concave portion formed on the (back surface of the convex portion 23). That is, since the contents can easily flow out from the inside of the concave portion, the contents can be prevented from accumulating in the mouth portion 7 and being noticed.

  A buckling eigenvalue analysis was performed on the bottle can 1 of the above-described modified example and the bottle can 100 of the reference example shown in FIGS. 6 and 7 by ABAQUS (analysis software), and the buckling load was confirmed. It was confirmed that the bottle can 1 of the modified example with respect to the bottle can 100 is improved in buckling strength of the can by about 20%, for example.

Although not particularly illustrated, a concave arc is formed between the plurality of concave arc portions 21 and 22 located between the convex portions 13 and 23 and the shoulder portion 6 in a longitudinal sectional view along the can axis C of the bottle can 1. A straight portion connecting the portions 21 and 22 may be formed.
In this case, in the longitudinal cross-sectional view of the bottle can 1, a plurality of concave arc portions 21 and 22 and straight portions connecting the concave arc portions 21 and 22 are provided between the convex portions 13 and 23 and the shoulder portion 6. It is formed. By providing the straight portion, it becomes easy to ensure a long distance along the can axis C direction between the convex portions 13 and 23 and the shoulder portion 6, and accordingly, the can shaft C between the convex portion 13 and the turnable portion 12. The distance in the direction can be shortened, and the operational effects of the above-described embodiments and modifications can be stably obtained.

  In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modification, and a remark etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

  The bottle can and the bottle can with a cap of the present invention can keep the buckling strength of the can body as usual or higher even when the thickness is reduced. Therefore, it has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Bottle can 2 Can bottom 3 Can barrel 5 Trunk portion 6 Shoulder portion 7 Mouth portion 11 Screw portion 12 Cabra portion 13, 23 Convex portion 16 Lower end 20, 24 Top portion 21 of the concave portion (concave arc portion)
22 Second concave arc part (concave arc part)
25 Tapered part 31 First connection part 32 Second connection part 41 First convex arc part (convex arc part)
42 Second convex arc part (convex arc part)
43 Straight portion A Length along the can axis direction of the convex portion B Distance along the can axis direction between the lower end of the turnbuckle portion and the top portion of the convex portion located on the outermost radial direction C Can shaft E First The distance along the can axis direction between the connecting part and the second connecting part F The radial direction between the top of the convex part and the part located radially inward between the convex part and the shoulder part Distance along

Claims (12)

A bottomed cylindrical bottle can having a can body and a bottom,
The can body is
A body connected to the can bottom;
A shoulder that is reduced in diameter as it goes upward from the trunk,
A mouth extending upward from the shoulder,
The mouth is
A threaded portion;
A caulking portion that is arranged adjacent to the lower portion of the screw portion and bulges outward in the radial direction;
A hook-shaped convex portion that is disposed between the turnip portion and the shoulder portion, protrudes radially outward, and extends in the circumferential direction;
A bottle can in which a distance along a can axis direction between a lower end of the turnip portion and a top portion located radially outermost of the convex portions is 5 mm or less. The bottle can according to claim 1,
A bottle can comprising a plurality of concave arc portions connecting the convex portions and the shoulder portions between the convex portions and the shoulder portions in a longitudinal sectional view along the can axis. The bottle can according to claim 2,
A first connecting portion that connects the first concave arc portion adjacently disposed below the convex portion and the convex portion among the plurality of concave arc portions;
The distance along the can axis direction between the second concave arc portion adjacently disposed above the shoulder portion of the plurality of concave arc portions and the second connection portion connecting the shoulder portions is 3 mm. This is a bottle can. The bottle can according to claim 2 or 3,
A bottle can provided with a straight portion connecting the concave arc portions between the concave arc portions in a longitudinal sectional view along the can axis. The bottle can according to any one of claims 1 to 4,
The top of the convex portion;
A bottle can in which a distance along a radial direction between a portion located radially inward between the convex portion and the shoulder portion is larger than 0.6 mm. It is a bottle can according to any one of claims 1 to 5,
The said convex part is a bottle can which has a some convex arc part by the longitudinal cross-sectional view along a can axis | shaft. The bottle can according to claim 6,
In the longitudinal cross-sectional view along the can axis, the convex portion has a linear portion that connects a plurality of the convex arc portions. It is a bottle can as described in any one of Claims 1-7,
The bottle can whose length along the can axis direction of the convex part is 1.5 to 8 mm. A bottle can according to any one of claims 1 to 8,
A bottle can having a tapered portion that is inclined upward as it goes radially inward at an upper end portion of the convex portion. The bottle can according to any one of claims 1 to 9,
A bottle can in which the top portion of the convex portion is disposed on the radially outer side with respect to any one of the portion located on the outermost radial direction in the turnable portion and the portion located on the outermost radial direction in the screw portion. . The bottle can according to any one of claims 1 to 10,
The bottle can in which the plate thickness of the convex portion is 0.3 mm or less.   The bottle can with a cap by which the cap was attached to the said opening part of the bottle can as described in any one of Claims 1-11.

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