JP5256150B2 - Can body body with bottomed cylindrical body and beverage can product filled with beverage - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a can container body having a bottomed cylindrical body shape and a beverage can product which is sealed with a lid after filling it with a beverage, and more specifically, has a feature in the form of a can bottom, and the can bottom is thin In addition, the present invention relates to a can container body and a beverage can product having a bottom portion that can maintain the rigidity of the can bottom portion and can reliably ensure the self-supporting property due to an increase in internal pressure.

  Conventionally, the bottom shape of so-called positive pressure cans in which carbonated beverages such as beer are sealed in a can container is generally a dome shape that allows the central area that occupies most of the bottom to enter the interior of the container, and the bottom seat As the surface, a structure in which ring-shaped protrusions are formed on the outer periphery of a dome shape is adopted.

  Such a conventional positive pressure can has a dome shape that allows the center of the bottom to enter the inside of the container as described above in order to ensure pressure resistance, and the thickness of the bottom is the can. It is set to be quite thick compared to the thickness of the can body that constitutes the side of

  The market scale in which such positive pressure cans are used is extremely large, and even if only a small amount of metal is used in individual cans, the overall cost can be greatly reduced.

  From such a point of view, Japanese Patent Publication No. 2002-515842 discloses the main purpose of reducing the thickness of the metal material of the bottom wall of the can, and a plurality of dome portions formed outwardly and a plurality of dome portions. Disclosed is a bottom wall which is provided with substantially square frustum-shaped support legs, these support legs are alternately arranged in the circumferential direction at intervals, and protrude downwardly beyond the dome portion. .

JP-T-2002-515842

  However, in the above-mentioned prior art document 1, research and disclosure of a sufficient structure for ensuring the pressure resistance and the self-supporting property of the container has not been made. When it rises, there is a possibility that the independence of the container cannot be secured if the bottom center portion is slightly swollen.

  Under such circumstances, the present invention has been invented, and its purpose is to maintain the rigidity of the bottom of the can when the thickness of the bottom of the can is reduced, and to ensure the independence associated with the increase in internal pressure. It is providing the can container main body provided with the bottom part which can be ensured, and a drink can product using the same.

  In order to solve such a problem, the inventors of the present application, as a result of earnestly researching various parameters including the leg height, the radius of curvature of the dome portion, the can diameter, etc. In particular, there is a limit to increasing the leg height L due to the aluminum processing limit, and the relationship between the radius of curvature of the dome and the size of the can diameter is extremely important in order to ensure the self-sustainability of the container. The headline and the present invention have been conceived.

That is, the present invention is a bottomed cylindrical body-shaped can container body made of a metal material having a cylindrical side wall and a bottom part integrally connected to the side wall, wherein the bottom part is A dome portion that curves downward and protrudes outwardly, and a curved support leg that is formed by projecting a plurality of peripheral portions of the dome portion that is equally angle-divided further downward and outwardly in a curved shape, and When the radius of curvature defining the curvature of the dome at the bottom is R ₃ (mm), 1.04 ≦ R ₃ /D≦1.67 in relation to the diameter D (mm) of the cylindrical side wall. It is comprised so that the bottom part which satisfy | fills the conditions may be provided.

Moreover, as a preferable aspect of the bottomed cylindrical body body of the present invention, when the radius of curvature defining the curvature of the dome portion at the bottom portion is R ₃ (mm), the diameter of the cylindrical side wall In relation to D (mm), a bottom portion that satisfies the condition of 1.17 ≦ R ₃ /D≦1.33 is provided.

  Moreover, as a preferable aspect of the bottomed cylindrical body main body of this invention, it is comprised so that the diameter D (mm) of the said cylindrical side wall may be 52-95 mm.

  Moreover, as a preferable aspect of the bottomed cylindrical body-shaped can container body of the present invention, the height L (mm) of the curved support leg is 0.12 ≦≦ in relation to the diameter D (mm) of the side wall. It is configured to satisfy L / D ≦ 0.18.

  Moreover, as a preferable aspect of the bottomed cylindrical body body of the present invention, the bottom portion has an average thickness t (mm) of 0.0030 in relation to the side wall diameter D (mm). ≦ t / D ≦ 0.0045 is satisfied.

  Moreover, as a preferable aspect of the bottomed cylindrical body body of the present invention, the number of the curved support legs is configured to be 4 to 8.

  Moreover, as a preferable aspect of the bottomed cylindrical body body of the present invention, a gap between the adjacent curved support legs and a central portion of the bottom surrounded by the plurality of curved support legs constitute a dome part. Configured as follows.

  Moreover, as a preferable aspect of the bottomed cylindrical body-shaped can container body of the present invention, a configuration in which the plurality of curved support legs are arranged and configured is a petaloid shape.

  The beverage can product of the present invention is formed by filling the beverage into the bottomed cylindrical body of the above-mentioned can and then sealing the opening with a lid.

  Moreover, as a preferable aspect of the beverage can product of the present invention, the pressure inside the can is configured to be 640 kPa or less.

  Moreover, as a preferable aspect of the beverage can product of the present invention, the beverage is configured to be a beverage containing carbonic acid.

The present invention relates to a bottomed cylindrical body body made of a metal material having a cylindrical side wall and a bottom part integrally connected to the side wall, the bottom part facing downwardly outward. A curved support leg formed by projecting a plurality of peripheral portions of the dome portion that is equally angle-divided further downward and outwardly in a curved shape. When the radius of curvature defining the curvature of the dome is R ₃ (mm), the condition of 1.04 ≦ R ₃ /D≦1.67 in relation to the diameter D (mm) of the cylindrical side wall. Since the bottom of the can bottom can be made thinner, the rigidity of the can bottom can be maintained even when the can bottom is thinned, and the beverage can be sealed with a lid after filling the can container body with a beverage containing carbonic acid. The pressure inside the can of the can product is, for example, 640 kP Be reached, it is possible to reliably maintain the autonomy associated with increase in the internal pressure.

FIG. 1 is a schematic perspective view of a bottomed tubular body main body of the present invention, as viewed from the bottom. FIG. 2 is a schematic enlarged perspective view of the bottom of the bottomed cylindrical body of the present invention. FIG. 3 is a schematic enlarged perspective view of the bottom corresponding to FIG. 2, and shows an uneven shape image using lines. FIG. 4 is a schematic cross-sectional view of the bottom portion of the can container body. In the cross-sectional view, the number of curved support legs is four (or six) so that the cross-sections of the curved support legs appear evenly at both ends of the drawing. 8), and the curved support legs are represented as a cross-sectional view equally divided in the radial direction. This is a state before the inside of the container is pressurized. FIG. 5 is a schematic cross-sectional view showing a state in which the bottom of a can container body as a beverage can product is deformed by being pressurized, so that the cross section of the curved support leg appears evenly at both ends. The number of support legs is four (or six or eight), and is a cross-sectional view in which the curved support legs are equally divided in the radial direction. The solid line at the bottom is the state before pressing, and the dotted line is the state after pressing. That is, the dotted line is configured as a beverage can product and is in a pressurized state (a state of a positive pressure can).

  Hereinafter, the bottomed cylindrical body-shaped can container body of the present invention and the beverage can product sealed with a lid after filling it with a beverage will be described in detail.

  First, the bottomed cylindrical body-shaped can container main body will be described.

Description Figure 1 of the can container body bottomed cylindrical body shape is a schematic perspective view of a can container body bottomed cylindrical body shape of the present invention, a drawing viewed from the bottom direction, FIG. 2 can container FIG. 3 is a schematic enlarged perspective view of the bottom portion of the main body, FIG. 3 is a schematic enlarged perspective view of the bottom portion corresponding to FIG. It is typical sectional drawing of the bottom part of a can container main body, and the number of curved support legs is a case of 4 (or 6 pieces, 8 pieces), and it is curved so that the cross section of a curved support leg may appear equally at both ends. FIG. 5 is a cross-sectional view in which the support legs are equally divided in the radial direction, and FIG. 5 is a drawing similar to FIG. 4, and shows that the bottom of the can container body (the state of the positive pressure can) is deformed when being pressurized. It is a typical sectional view shown.

  In the present invention, “downward” or “downward” refers to a direction toward the bottom when the container is placed upright. In other words, it is defined as the direction in which the container is placed from the bottom side when the container is lifted. This opposite direction is “upward” or “upward”.

  As shown in FIG. 1, the can container body 1 of the present invention is made of a metal material such as aluminum, and is formed integrally with a cylindrical side wall 20 (so-called can body) and connected to the side wall 20. A bottomed cylindrical body shape having a bottom portion 30 is formed.

  An opening 10 is formed above the side wall 20, and a neck 11 is formed so that it can be sealed and fitted with a lid sealing material (not shown) such as a can lid.

  As shown in FIG. 1, the bottom portion 30 of the can container body has a dome-shaped dome portion 31 that curves and protrudes downward outward, and a plurality of peripheral portions of the dome portion that are equally angle-divided further outwardly downward. And a curved support leg 35 formed so as to protrude in a curved direction.

  In this manner, the configuration in which the plurality of curved support legs 35 are arranged and configured like a petal is sometimes called a petaloid shape.

  1-3, the number of the curved support legs 35 is illustrated as a preferred example. The number of the curved support legs 35 is preferably 4 to 8, and particularly preferably 5. If it is less than 4, stable independence is difficult and stable conveyance or the like cannot be achieved, and if it exceeds 8, molding becomes extremely difficult.

  4 to 5, the number of the curved support legs is four (or six or eight) so that the cross sections of the curved support legs 35 appear evenly at both ends of the drawing. . In these drawings, the curved support legs 35 are depicted as sectional views equally divided in the radial direction.

  The dome portion 31 is different from a normal image due to the presence of the curved support legs 35, and the gap between adjacent curved support legs 35 (five places in FIG. 1) and the center of the bottom surrounded by the plurality of curved support legs 35. It is comprised by the part (FIG. 1 center one place), and these are connected integrally.

  The form of the dome 31 can be clearly understood with reference to FIG. 1 and by viewing the drawing shown in FIG. That is, in FIG. 4, the dome part 31 indicated by the dotted line is a dome part located in the gap between the adjacent curved support legs 35, and the dome part 31 indicated by the solid line is formed by the plurality of curved support legs 35. It is a dome part located in the center part of the bottom part enclosed.

What is characteristic in the present invention is that, when the radius of curvature defining the curvature of the dome portion at the bottom 30 is R ₃ (mm), the relationship with the diameter D (mm) of the cylindrical side wall 20 is 1. It is configured to have a bottom portion that satisfies the condition of 04 ≦ R ₃ /D≦1.67, more preferably the condition of 1.17 ≦ R ₃ /D≦1.33. Of course, the base point of R ₃ (mm) exists on the axis P of the can shown in FIG.

The radius of curvature R ₃ (mm) that defines the curvature of the dome is divided into a plurality of parts by design, and it is difficult to think of locally changing the value of the radius of curvature R ₃ depending on the location. In the case of using a joint / combination radius of two or more kinds of curvature radii which are locally different when defining the curvature radius R ₃ (mm) in the present invention, the central portion G1 and the side wall in FIG. contacting the 20 G2, G3 of the constant curvature radius again determined from the three points may be applied as R _3.

Moreover, the diameter D of a general can beer is 66 mm. For example, considering this diameter D and the wall thickness, the radius of curvature R ₃ is 68.7 to 110.1 mm, preferably 72.1 to 99. 0.2 mm, more preferably 73.0-97.0 mm, and most preferably 77.2-87.5 mm.

  In addition, when the outer diameter of the cylindrical side wall 20 is locally changed in the axial direction, the distribution of the diameter D is taken in the longitudinal direction (axial direction), and the most existing D value is cylindrical. What is necessary is just to employ | adopt as the diameter D (mm) of the side wall 20 of this. In the present invention, the diameter D (mm) is applicable in the range of 52 to 95 mm.

The height L of the curved support leg 35 in the present invention (mm) (置平surface 70 mounting the G3 that outermost radius of curvature R ₃ of the dome portion as shown in FIG. 4 intersects the side wall 20 of the cylindrical The distance L in the height direction is 0.12 ≦ L / D ≦ 0.18, preferably L / D = 0.15 in relation to the diameter D (mm). Considering L alone, when the diameter D = 66 mm, the L value is in the range of 8 to 12 mm, preferably 10 mm. The height of the curved support leg 35 is limited in relation to the diameter D due to the processing limit of aluminum.

  The average thickness t (mm) of the bottom 30 in the present invention is 0.0030 ≦ t / D ≦ 0.0045, preferably t / D = 0.030, in relation to the diameter D (mm). Is done. Considering t alone, when the diameter D = 66 mm, the t value is 0.20 to 0.30 mm, preferably 0.20 to 0.25 mm, more preferably 0.20 to 0.22 mm, and most preferably Is 0.20 mm.

When the value of R ₃ / D is less than 1.04, the distance H between the dome portion lowest position G1 and the placement plane 70 seen in FIG. 4 tends to be small, and in this state, the internal pressure is 640 kPa. In the case of the positive pressure can product, the independence may not be satisfied. On the other hand, if the value of R ₃ / D exceeds 1.67, when the product is a positive pressure can product having an internal pressure of 640 kPa, the downward extension ΔL of the curved support leg 35 shown in FIG. As a result, the overall height of the can is increased, which may cause inconveniences such as can clogging and boxing failure during process conveyance.

For further details regarding the setting of the numerical range of these R ₃ / D values, refer to the specific experimental examples described later.

In the cross-sectional view of FIG. 4, the value of the radius R ₁ constituting the curved support leg 35 is in the range of 0.12 ≦ R ₁ /D≦0.18 in relation to the diameter D (mm). As a numerical value of R ₁ alone, when the diameter D = 66 mm, R ₁ = 8 to 12 mm, preferably 9 to 11 mm, more preferably 10 mm. Furthermore, in the cross-sectional view of FIG. 4, the value of the radius R ₂ that continues from the curved support leg 35 to the dome located at the center is 0.12 ≦ R ₂ / D ≦ 0 in relation to the diameter D (mm). .18, and the numerical value of R ₂ alone is R ₂ = 8 to 12 mm, preferably 9 to 11 mm, more preferably 10 mm when the diameter D = 66 mm.

Description of Beverage Can Products After filling a can container body with a bottomed cylindrical body having a bottom with a characteristic shape as described above, a lid is attached to the opening 10 and hermetically sealed. Thus, a beverage can product is formed. Suitable beverages stored inside the can include beer, sparkling liquor, so-called third beer, carbonated soft drink, carbonated wine, and the like, with a positive pressure inside the can. Can be mentioned.

  Moreover, as for the beverage can product of this invention, it is desirable to target the product in which the pressure inside the can is 640 kPa or less.

  Hereinafter, specific experimental examples relating to the can container having a bottomed cylindrical shape according to the present invention will be shown, and the present invention will be described in more detail.

[Experimental Example I]
A so-called petaloid shape search and breakdown voltage analysis were performed by a simulation method using a finite element method.

When searching for the shape of the bottom, it was assumed that the following shape search items were satisfied.
< Shape search >
・ Guaranteed pressure strength of 640 kPa ・ Displacement of can bottom center and leg (when internal pressure is 640 kPa)
Center: Does not reach the bottom (to ensure independence)
Leg: Allowable up to 1.0mm increment

The procedure for pressure analysis was as follows.
< Pressure analysis (I) Design parameters >
The bottom thickness was in the range of 0.20 mm to 0.30 mm.
The values of the following shape setting factors are constants.
・ Leg height L (see FIG. 4): 10 mm
・ Leg swelling R ₁ (see FIG. 4): 10 mm
・ Leg joint R ₂ connected to the dome (see Fig. 4): 10mm
-Diameter D of cylindrical side wall 20: 66 mm

Therefore, the variable is R ₃ (mm), which is the radius of curvature that defines the curvature of the dome with respect to the diameter D, and the initial (no internal pressure) bottom center height H (see FIG. 4), which is affected by the value. In this experiment, since the diameter D is constant, if R ₃ / D is determined, the bottom center height H is determined.

  The criteria for the determination of pressure strength was as follows.

<Pressure strength criteria>
(1) ΔH−ΔL <H (when the internal pressure is 640 kPa)
(2) ΔL <1.0 mm (when internal pressure is 640 kPa)
Where ΔH is the amount of deformation at the center of the bottom, and ΔL is the amount of deformation of the legs (see FIG. 5).
H is the initial bottom center height (see Fig. 4)
When the above (1) is not satisfied, it is determined that there is no independence (improper).
When the above (2) is not satisfied, it is determined that the leg elongation is large (unsuitable).

Based on such criteria for pressure-resistant strength, the range of R ₃ / D satisfying the above (1) and (2) when the internal pressure is 640 kPa is changed, and the bottom thick part is changed within the range of 0.20 mm to 0.30 mm. Asked.

  The results are shown in Table 1 below.

Further, in relation to Table 1, in the case where the bottom wall thickness is 0.20 mm, specific examples showing the degree of can deformation when R ₃ / D is 1.27, 0.98, and 1.74 Table 2 shows the results of the evaluation and the evaluation results for the independence and leg stretchability.

In addition, in relation to Table 1, when the bottom wall thickness is 0.25 mm, specific examples showing the degree of can deformation when R ₃ / D is 1.27, 0.98, and 1.74 Table 3 shows the evaluation results for the independent numerical values and the independence and leg stretchability.

In addition, in relation to Table 1, when the bottom wall thickness is 0.30 mm, specific examples showing the degree of can deformation when R ₃ / D is 1.27, 0.98, and 1.74 Table 4 shows the evaluation results for the various numerical values, as well as the independence and leg stretchability.

[Experimental Example II]
In accordance with Experimental Example I, the can diameter D was varied in the range of 52 mm to 95 mm, and a simulation experiment was performed to determine the range of other parameters that can confirm the effect of the present invention in relation to the diameter D. .

As a result, the condition by the following relational expression, that is,
1.04 ≦ R ₃ /D≦1.67
0.0030 ≦ t / D ≦ 0.0045
0.12 ≦ L / D ≦ 0.18
0.12 ≦ R ₁ /D≦0.18
0.12 ≦ R ₂ /D≦0.18
It was experimentally confirmed that the effects of the present invention are manifested within the range of.

From the above results, the effect of the present invention is clear. That is, the present invention is a bottomed cylindrical body-shaped can container body made of a metal material having a cylindrical side wall and a bottom part integrally connected to the side wall, wherein the bottom part is A dome portion that curves downward and protrudes outwardly, and a curved support leg that is formed by projecting a plurality of peripheral portions of the dome portion that is equally angle-divided further downward and outwardly in a curved shape, and When the radius of curvature defining the curvature of the dome at the bottom is R ₃ (mm), 1.04 ≦ R ₃ /D≦1.67 in relation to the diameter D (mm) of the cylindrical side wall. Since the bottom of the can bottom can be made thinner, the rigidity of the can bottom can be maintained, and the lid of the can is filled with a carbonated beverage. The pressure inside the can of a beverage can product, for example, Be reached 40 kPa, it is possible to reliably maintain the autonomy associated with increase in the internal pressure.

DESCRIPTION OF SYMBOLS 1 ... Can container main body 10 ... Opening part 20 ... Cylindrical side wall 30 ... Bottom part 31 ... Dome part 35 ... Curve support leg

Claims (11)

A bottomed cylindrical body-shaped can container body made of a metal material having a cylindrical side wall and a bottom formed integrally with the side wall,
The bottom portion is a dome portion that curves and protrudes outwardly outward, and a curved support leg formed by projecting a plurality of peripheral portions of the dome portion that are equally angle-divided further outwardly in a curved shape, With
When the radius of curvature defining the curvature of the dome portion at the bottom portion is R ₃ (mm), 1.04 ≦ R ₃ / D ≦ 1... In relation to the diameter D (mm) of the cylindrical side wall. A bottomed cylindrical body-shaped can container body comprising a bottom that satisfies 67 conditions. When the radius of curvature defining the curvature of the dome portion at the bottom portion is R ₃ (mm), 1.17 ≦ R ₃ / D ≦ 1... In relation to the diameter D (mm) of the cylindrical side wall. A bottomed cylindrical body-shaped can container body, comprising a bottom that satisfies the condition of 33.   The bottomed cylindrical body-shaped can container body according to claim 1 or 2, wherein a diameter D (mm) of the cylindrical side wall is 52 to 95 mm.   The height L (mm) of the curved support leg satisfies 0.12 ≦ L / D ≦ 0.18 in relation to the diameter D (mm) of the side wall. The bottomed cylindrical body-shaped can container main body.   The average thickness t (mm) of the bottom portion satisfies 0.0030 ≦ t / D ≦ 0.0045 in relation to the diameter D (mm) of the side wall. A can container main body having a bottomed cylindrical shape described in 1.   The number of the said curved support legs is 4-8 pieces, The bottomed cylindrical body-shaped can container main body in any one of Claim 1 thru | or 5.   The bottomed cylindrical body shape according to any one of claims 1 to 6, wherein a gap between the adjacent curved support legs and a central portion of a bottom part surrounded by the plurality of curved support legs constitute a dome part. Can container body.   The bottomed cylindrical body-shaped can container main body according to any one of claims 1 to 7, wherein a form arranged and constituted by the plurality of curved support legs is a petaloid shape.   A beverage can product formed by filling the bottomed cylindrical body-shaped can container body according to any one of claims 1 to 8 with a beverage and then sealing the opening.   The beverage can product according to claim 9, wherein the pressure inside the can is 640 kPa or less.   The beverage can product according to claim 10, wherein the beverage is a beverage containing carbonic acid.

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