WO2019151281A1 - Positive-pressure can - Google Patents

Abstract

Provided is a positive-pressure can in which the restoration sound of a polyhedral wall is increased and which imparts an auditory effect at the same time as the visual effect of a unit panel being restored, or a positive-pressure can in which it is possible to reduce the restoration sound to an extent that the same can be ignored. The maximum value of a maximum depth change quantity of a unit panel is set within the range of 0.75-1.2 mm, or the average value of the maximum depth change quantity for the unit panel for which the maximum depth change quantity is 0.4 mm or greater is set within the range of 0.54-0.75 mm. In addition, the average value of the maximum depth change quantity of each unit panel is set within the range of 0.46-1.08 mm, the unit panel being such that the cross-sectional shape in a direction parallel to the center axis of a can barrel is depressed in a circular arc toward the inner side of the can barrel in a free state in which no internal pressure is added. In addition, the maximum value of the maximum depth change quantity of the unit panel is configured to be 0.54 mm or less, or the average value of the maximum depth change quantity for the unit panel for which the maximum value of the maximum depth change quantity is 0.4 mm or greater is configured to be 0.45 mm or less.

Description

Positive pressure can

The present invention relates to a positive pressure can in which an internal pressure acts on the can body, such as a can for beer, strawberry high and other carbonated beverages, a can filled with an inert gas that prevents oxidation of the contents, and in particular, the can The present invention relates to a positive pressure can that has a polyhedral wall composed of a plurality of unit panels in the body, and in a sealed state, the unit panels bulge outward due to internal pressure, restores the original shape when opened, and emits a restoring sound when restored.

As a conventional positive pressure can of this type, for example, a positive pressure can as described in Patent Document 1 is known.
This positive pressure can is provided with a can body having a can body and a can lid for sealing the can body in a positive pressure state. It is composed of a large number of unit panels with a folding structure partitioned by. The unit panel has a shape in which the can body is partially recessed, elastically deforms in a direction that the recess becomes smaller due to internal pressure acting on the can body, and is restored to the original recessed shape when the can lid is opened. Yes.
In this way, when the contents are sealed, the unevenness due to the depression of the unit panel is small due to the internal pressure. The product value was given.

Japanese Patent No. 3915450

As a result of earnest research to further increase the commercial value of a positive pressure can having a polyhedral wall, the present inventors have focused on the restoration sound that can be heard when the unit panel is restored to its original shape when opened.
As a result of the examination, it was found that the amount of depth change when restoring the unit panel is related to the restored sound.
A first object of the present invention is to provide a positive pressure can in which a restoration sound of a unit panel constituting a polyhedral wall is increased, and an auditory effect is added simultaneously with a visual effect of restoration of the unit panel.
The second object of the present invention is to provide a positive pressure can that can be reduced to such an extent that the restored sound of the unit panel constituting the polyhedral wall is not a concern.

[Means for Solving the Problem (First Invention Group)]
In order to achieve the first object, one invention constituting the first invention group is:
A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
The maximum value of the maximum depth change amount of the unit panel is set to 0.75 mm or more and 1.2 mm or less.
The unit panel does not need to be surrounded by the boundary ridgeline, and includes a case where at least a part of the unit panel is partitioned by the boundary ridgeline.
Although the restoration sound is also heard for the current product, the tearing sound of the can lid due to the pull tab and the gas emission sound when the gas escapes are heard first, and then the restoration sound is heard. Is difficult to pull.
According to the present invention, the maximum value of the maximum depth change amount of each unit panel is controlled to be 0.75 mm or more, so that a restored sound having a size that can be easily heard even after the gas emission sound is heard is generated. be able to. Accordingly, an auditory effect is added at the same time as a visual effect restored by the unit panel, and an effect when the unevenness appears synergistically can be enhanced. In particular, since the maximum depth change greatly changes and the change is visually noticeable, the effect of attracting attention and making the sound sensitive and listening to the restored sound is high. Further, in order to increase the maximum depth change amount, it is necessary to enlarge the unit panel, and the visual effect can be enhanced by greatly changing the large unit panel in addition to the depth. On the other hand, when the unit panel is enlarged, the axial load strength at the time of empty can tends to decrease, and the upper limit of the maximum value of the maximum depth change amount is set to 1.2 mm or less to maintain the axial load strength at the time of empty can. can do.
Further, another invention constituting the first invention group includes a can body having a can body and a can lid for sealing the can body in a positive pressure state, wherein at least a part of the can body is convex. It has a polyhedral wall composed of a large number of unit panels partitioned by boundary ridgelines, and the unit panel is indented inward of the can body in a free state, and the depression is small due to internal pressure acting on the can body. In a positive pressure can with a structure that is deformed in the direction to be restored, restored to its original shape when the can lid is opened, and restored when it is restored,
An average value of the maximum depth change amount for the unit panel in which the maximum depth change amount is 0.4 mm or more is set in a range of 0.54 mm or more and 0.75 mm or less.
Since some unit panels may not be restored when opened, the effect of unit panels that are not restored can be excluded by removing unit panels whose maximum depth change is less than 0.4 mm. Can be accurately evaluated.
By using the average value in this way, it is possible to realize a positive pressure can that can stably evaluate the maximum amount of change in depth and obtain a stable restoration sound of a certain level or more.
About the axial load intensity | strength at the time of an empty can, what is necessary is just to set to about 0.75 mm by an average value with respect to the upper limit of 1.2 mm in the case of evaluating with a maximum value.
Still another invention constituting the first invention group includes a can body having a can body and a can lid for sealing the can body in a positive pressure state, and at least a part of the can body is convex. The unit panel has a polyhedral wall composed of a large number of unit panels partitioned by boundary ridge lines, and the unit panel has a shape recessed inward of the can body in a free state, and a recess is formed by an internal pressure acting on the can body. In a positive pressure can with a configuration that deforms in a smaller direction, restores the original shape when the can lid is opened, and generates a restoration sound when restoring,
The maximum value of the maximum depth change amount of the unit panel in which the maximum value of the maximum depth change amount of the unit panel is set to 0.75 mm or more and 1.2 mm or less and the maximum depth change amount is 0.4 mm or more. Is set in a range of 0.54 mm or more and 0.75 mm or less.
In this way, by using the maximum value and the average value of the maximum depth change amount, it is possible to realize a positive pressure can in which the maximum depth change amount is stable, the maximum value is large, and a larger restoration sound can be obtained.

The invention of the first invention group can be configured as follows.
1) The sound pressure level of the restored sound when the positive pressure can is opened is set to 75 dB or more at a position 40 cm away from the can body.
The gas emission sound is about 70 dB, and if it is about 75 dB, the sound level is sufficiently audible even after the gas emission sound.
2) The polyhedral wall is 25% or more of the area of the can body.
In this way, the sound pressure level can be effectively increased.
3) The unit panel has a rhombus shape defined by the oblique ridgelines as the boundary ridgelines, two vertices located on the center plane passing through the central axis of the can body, and 2 located at a symmetrical position with respect to the center plane. It has a total of four vertices, and in a free state where no internal pressure is applied, it is bent inward of the can body by a lateral fold line of valley folds connecting vertices located at symmetrical positions with respect to the center plane. The maximum depth change amount is the change amount of the unit panel depth at the midpoint of the horizontal ridge line.
In this way, the horizontal ridgeline that has been deformed so that the center swells due to the internal pressure returns to the original shape all at once, so that a clear restoration sound can be generated. In addition to the case where the unit panel is completely elastically restored, the case where the unit panel is partially plastically deformed and does not completely return to the original shape is included.
4) The polyhedral wall has a configuration in which unit panel rows in which a plurality of the unit panels are arranged in a direction parallel to the central axis of the can body are densely arranged in the circumferential direction of the can body, The number of corners of the cross section passing through the horizontal ridge line of the unit panel is set in the range of 11 to 12 corners.
When the angle is larger than 12 corners, the size of the unit panel is reduced, so that the maximum depth change amount is reduced. On the other hand, if the angle is smaller than 11 corners, the area of the unit panel increases and the maximum depth change amount increases, but the axial load strength at the time of empty can cannot be maintained.
5) The area of the unit panel is set to 130 mm ² or more and 180 mm ² or less.
If it is smaller than 130 mm ² , it becomes difficult to deform, so that the maximum depth change amount becomes small. If it is larger than 180 mm ² , the maximum depth change amount becomes large, but the axial load strength at the time of empty can cannot be maintained.
6) The maximum depth change amount is the maximum depth change amount when the internal pressure before opening is 20 to 300 kPa, preferably 120 to 150 kPa.
The present invention has found that there is a certain relationship between the maximum depth change amount and the restored sound, and a suitable range of internal pressure is sufficient until the depression of the unit panel becomes close to a cylinder when the internal pressure is applied. The range is such that it is deformed and does not cause plastic deformation as much as possible, and returns to the original hollow shape when the internal pressure is released. A preferable range is 20 to 300 kPa, and a more preferable range is 120 to 150 kPa.
When the internal pressure increases, the panel depth in the internal pressure acting state becomes shallow, and the difference from the panel depth in the internal pressure released state increases, and as a result, the maximum depth change amount increases. The maximum depth change varies depending on the can depth and panel size.
The maximum depth change amount is determined by various factors, and the maximum depth change amount is related to the restored sound.
This internal pressure condition setting does not limit the range of use of the positive pressure can, but sets the measurement conditions. For example, even if it is used at a pressure lower than 120 kPa or a pressure higher than 150 kPa, it shall be included within this range when measured in this pressure range.

[Effect of the invention (first invention group)]
According to the invention of the first invention group, it is possible to increase the restoration sound of the unit panel constituting the polyhedral wall, and to realize a positive pressure can that adds an auditory effect at the same time as the visual effect that the unit panel restores. it can.

[Means for Solving the Problem (Second Invention Group)]
In order to achieve the first object, one invention constituting the second invention group is:
In a positive pressure can comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state,
Having a polyhedral wall composed of a large number of unit panels defined by at least part of the can body by convex boundary ridge lines;
In a free state where no internal pressure is applied, the unit panel has a cross-sectional shape parallel to the central axis of the can body that is recessed in an arc shape inwardly of the can body, and the depression is small due to the internal pressure acting on the can body. It is deformed in the direction to be restored, restored to its original shape when the can lid is opened, and a restoration sound is emitted when restoring,
The average value of the maximum depth change amount of each unit panel is set in a range of 0.46 mm or more and 1.08 mm or less.
The unit panel has a configuration in which at least a part of the unit panel is partitioned by a boundary ridgeline, and includes both a configuration in which a part is opened and a closed configuration in which the entire periphery is surrounded by a boundary ridgeline.
As in the present invention, when the unit panel has a shape in which the cross-sectional shape in the direction parallel to the central axis of the can body is recessed in an arc shape, the amount of elastic strain at the time of internal pressure action increases and is released at a time when the internal pressure is released. If the restoration sound is large and the average value of the maximum depth variation of each unit panel is 0.46 mm or more and 1.08 mm or less, the restoration sound is maintained at a level larger than the gas emission sound 70 dB. I found out that I could do it.
As a result, even after the gas emission sound is heard, it is possible to generate a restoration sound that is large enough to be heard, and the visual effect that the unit panel restores, as well as the auditory effect and the effect when irregularities appear. Can be increased.
The restoration sound of this panel is related to the size per panel and the number of panels.
If the average value of the maximum depth change is large, the sound pressure level per panel increases, but it is necessary to increase the size of the panel, so the number of panels decreases and the overall restored sound decreases. To go. If the average value of the maximum depth change amount is 1.08 mm or less, the restoration sound can be maintained at a level higher than the gas emission sound 70B even if the number of panels is reduced.
If the average value of the maximum depth change amount is small, the sound pressure level per panel becomes small, but the size of the panel can be reduced to increase the number of panels, and the overall restored sound can be increased. it can. However, there is a limit, and if it is 0.46 mm or more, the restored sound can be increased.
Further, another invention constituting the second invention group is a positive pressure can provided with a can body having a can body and a can lid for sealing the can body in a positive pressure state.
Having a polyhedral wall composed of a large number of unit panels defined by at least part of the can body by convex boundary ridge lines;
In a free state where no internal pressure is applied, the unit panel has a cross-sectional shape parallel to the central axis of the can body that is recessed in an arc shape inwardly of the can body, and the depression is small due to the internal pressure acting on the can body. It is deformed in the direction to be restored, restored to its original shape when the can lid is opened, and a restoration sound is emitted when restoring,
The maximum value of the maximum depth change amount is set in a range of 0.59 mm or more and 1.31 mm or less.
In this way, by using the maximum value and the average value of the maximum depth change amount, it is possible to realize a positive pressure can in which the maximum depth change amount is stable, the maximum value is large, and a larger restoration sound can be obtained.

The invention of the second invention group can be configured as follows.
1) The sound pressure level of the restored sound is set to 75 dB or more at a position 40 cm away from the can body.
The gas emission sound is about 70 dB, and if it is about 75 dB, the sound level is sufficiently audible even after the gas emission sound.
2) The polyhedral wall is 25% or more of the area of the can body.
In this way, the sound pressure level can be effectively increased.
3) In the free state where no internal pressure is applied, the unit panel has a shape in which the center of the unit panel has a cross-sectional shape perpendicular to the central axis of the can body that is recessed inward of the can body with respect to a straight line. It has become.
Since it is curved both in the direction parallel to and perpendicular to the central axis of the can body, the amount of elastic strain during the action of internal pressure becomes larger and the restored sound becomes larger.
4) The average value of the maximum depth change amount is related to the size of the unit panel, and the larger the unit panel size is, the larger the maximum depth change amount is. The relationship between the number of unit panels and the number of unit panels is such that the larger the unit panel size, the smaller the number of unit panels.
5) The number of unit panels is set to 65 or more and 117 or less.
Even if the number of unit panels is larger than 117, the size of the unit panel becomes too small and the restored sound does not increase. On the other hand, when the number is less than 65, the unit panel can be enlarged, but the number is reduced and the restored sound does not increase.
6) The polyhedron wall in the free state has a plurality of wavy curved surfaces in the circumferential direction in which peaks and troughs are alternately formed in the axial direction, and the wavy curved surfaces are in relation to the central plane passing through the central axis of the can body The boundary ridge lines of the symmetrical shape are partitioned by the corrugated ridge lines, the narrow part of the interval between the corrugated ridge lines is a peak part of a corrugated curved surface, the wide part is a valley part, the unit panel is This is a region from the top of one crest of a corrugated curved surface to the top of the next crest through a trough, and the top and bottom unit panels are divided by the top of the crest.
In the case of such a wavy curved surface configuration, in particular, the restoration sound can be increased.
7) The maximum depth change amount is the maximum depth change amount when the internal pressure before opening is 20 to 300 kPa, preferably 120 to 150 kPa.
When the internal pressure increases, the panel depth in the internal pressure acting state becomes shallow, and the difference from the panel depth in the internal pressure released state increases, and as a result, the maximum depth change amount increases.
The present invention has found that there is a certain relationship between the maximum depth change amount and the restored sound, and a suitable range of internal pressure is sufficient until the depression of the unit panel becomes close to a cylinder when the internal pressure is applied. The range is such that it is deformed and does not cause plastic deformation as much as possible, and returns to the original depression shape when the internal pressure is released. The preferable range of the internal pressure when measuring the maximum depth change is 20 to 300 kPa, and the more preferable range is as follows. 120 to 150 kPa.
This internal pressure condition setting does not limit the range of use of the positive pressure can, but sets the measurement conditions. For example, even if the pressure is lower than 120 kPa or higher than 150 kPa, the maximum depth change amount is within the range described in the claims when measured in this pressure range.

[Effect of invention (second invention group)]
According to the invention of the second invention group, it is possible to realize a positive pressure can in which the restoration sound of the unit panel constituting the polyhedral wall is increased, and the auditory effect is added simultaneously with the visual effect of restoration of the unit panel.

[Means for Solving the Problem (Third Invention Group)]
In order to achieve the second object, one invention constituting the third invention group is:
A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
The maximum value of the maximum depth change amount of the unit panel is set to 0.54 mm or less.
The unit panel does not need to be surrounded by the boundary ridgeline, and includes a case where at least a part of the unit panel is partitioned by the boundary ridgeline.
With regard to the conventional positive pressure can, a tearing sound of the can lid due to the pull tab and a gas releasing sound when the gas escapes are heard loudly, and then a restoring sound is heard. This restored sound may be heard multiple times, and is an anxious sound when attention is paid.
By setting the maximum value of the maximum depth change amount to 0.54 mm or less, the restoration sound that can be heard after the gas emission sound can be reduced to a sound level that is not bothered by the gas emission sound.
Further, another invention constituting the third invention group includes a can body having a can body and a can lid for sealing the can body in a positive pressure state, and at least a part of the can body is convex. It has a polyhedral wall composed of a large number of unit panels partitioned by boundary ridgelines, and the unit panel is indented inward of the can body in a free state, and the depression is small due to internal pressure acting on the can body. In a positive pressure can that is deformed in the direction to be restored, restored to its original shape when the can lid is opened, and that produces a restoring sound when restored, the unit panel whose maximum depth change of the unit panel is 0.4 mm or more The average value of the maximum depth change amount is about 0.45 mm or less.
Since the variation becomes large when the maximum value of the maximum depth change amount is used as a reference, the average value of the maximum depth change amount of the unit panel was examined. However, it was found that not all unit panels are completely restored, and some unit panels may not be restored, and simply taking an average value is not clear. As a result of the examination, the average value excluding the unit panel whose maximum depth change is less than 0.4 mm can be excluded, so that the influence of the unit panel that is not restored can be excluded, and the restoration form of the polyhedral wall can be accurately evaluated. I found out that I can do it.
By using the average value in this way, it is possible to realize a positive pressure can that can stably evaluate the maximum amount of change in depth and obtain a stable restoration sound of a certain level or more.
When the maximum value of the maximum depth change amount is less than 0.4 mm, the sound pressure level is sufficiently low.
Further, another invention constituting the third invention group includes a can body having a can body and a can lid for sealing the can body in a positive pressure state, and at least a part of the can body It has a polyhedral wall composed of a large number of unit panels defined by convex boundary ridge lines, and the unit panels are indented inward of the can body in a free state, and by the internal pressure acting on the can body In a positive pressure can with a configuration that deforms in the direction that the dent becomes smaller, restores the original shape when the can lid is opened, and generates a restoration sound when restoring,
The unit panel is configured so that an average value of a maximum depth change amount is less than 0.4 mm. When the average value of unit panels with a maximum depth change of 0.4 mm or more is set to 0.45 mm or less, and the maximum value of the maximum depth change is between 0.4 mm and 0.45 mm, naturally The average value is less than 0.45 mm.
When there is no unit panel having a maximum depth change amount of 0.4 mm or more, the number of unit panels that are not restored is small, and the average value of the maximum depth change amounts of all unit panels is evaluated. Since the average value does not exceed 0.4 mm, the average value is configured to be less than 0.4 mm.

The invention of the third invention group can be configured as follows.
1) When the average value of the maximum depth change amount of the unit panel is less than 0.4 mm, it is set to be 0.15 mm or more and less than 0.4 mm.
In this range, you can hear the sound, but it will be small enough not to bother you.
2) The average value of the maximum depth change amount of the unit panel is set to 0.15 mm or less.
If it is made small to this range, it can be set as the level which cannot be heard completely.
3) The sound pressure level of the restored sound when the positive pressure can is opened is set to 72 dB or less at a position 40 cm away from the can body.
The gas emission sound is about 70 dB, and if it is about 70 dB and 72 dB or less, it becomes a level that does not matter. Preferably, it is set to 70 dB or less.
4) The polyhedral wall is 75% or less of the area of the can body.
5) The unit panel has a rhombus shape defined by the oblique ridgelines as the boundary ridgelines, two vertices located on a central plane passing through the central axis of the can body, and 2 located symmetrically with respect to the central plane. It has a total of four vertices, and in a free state where no internal pressure is applied, it is bent inward of the can body by a lateral fold line of valley folds connecting vertices located at symmetrical positions with respect to the center plane. The maximum change depth is a change in unit panel depth at the midpoint of the horizontal ridge line.
In this way, the rigidity of the boundary ridge line of the unit panel is high, and the horizontal ridge line that was deformed so that the center swells due to the internal pressure returns to the original shape at once, but the maximum depth change is small, so the restoration sound is reduced. can do. In addition to the case where the unit panel is completely elastically restored, the case where the unit panel is partially plastically deformed and does not completely return to the original shape is included.
6) The polyhedral wall has a configuration in which unit panel rows in which a plurality of the unit panels are arranged in a direction parallel to the central axis of the can body are densely arranged in the circumferential direction of the can body, The number of corners of the cross section passing through the horizontal ridge line of the unit panel is set in the range of 14 to 16 corners.
When the angle is smaller than 14 corners, the area of the unit panel is increased, the maximum amount of change in depth is increased, and the restored sound is anxious.
On the other hand, if it is larger than 16 corners, the size of the unit panel becomes small, so that molding becomes difficult. Therefore, it is preferable to set the angle from 14 to 16.
7) The area of the unit panel is set to 80 mm ² or more and 120 mm ² or less.
If it is smaller than 80 mm ² , it becomes difficult to form a panel, and if it is larger than 120 mm ² , the maximum depth change amount becomes large and the restored sound becomes large.
8) The unit panel has a shape in which a cross-sectional shape parallel to the central axis of the can body is recessed in an arc shape.
In the case of an arc, the unit panel is easily deformed. However, if the average value of the maximum depth change amount is set to 0.45 mm or less, the restored sound can be reduced to a level that does not matter. 9) The maximum depth change amount is the maximum depth change amount when the internal pressure before opening is 20 to 300 kPa, preferably 120 to 150 kPa.
When the internal pressure increases, the panel depth in the internal pressure acting state becomes shallow, and the difference from the panel depth in the internal pressure released state increases, and as a result, the maximum depth change amount increases.
The present invention has found that there is a certain relationship between the maximum depth change amount and the restored sound, and a suitable range of internal pressure is sufficient until the depression of the unit panel becomes close to a cylinder when the internal pressure is applied. The range is such that it is deformed and does not cause plastic deformation as much as possible, and returns to the original depression shape when the internal pressure is released. The preferable range of the internal pressure when measuring the maximum depth change is 20 to 300 kPa, and the more preferable range is as follows. 120 to 150 kPa.
This internal pressure condition setting does not limit the range of use of the positive pressure can, but sets the measurement conditions. For example, even if the pressure is lower than 120 kPa or higher than 150 kPa, the maximum depth change amount is within the range described in the claims when measured in this pressure range.

[Effect of invention (third invention group)]
According to the invention of the third invention group, the restoration sound of the unit panel constituting the polyhedral wall can be made small enough not to be concerned.

FIG. 1 shows a positive pressure can according to Embodiment 1 of the invention of the first invention group, (A) is a front view of an internal pressure acting state, (B) is a front view of an internal pressure released state, (C) is an enlarged schematic perspective view of a portion C in (B), and (D) is a sectional view taken along the line DD in (B). 2 shows a unit panel of the positive pressure can shown in FIG. 1, in which (A) is a front view, (B) is a cross-sectional view taken along line BB of (A), and (C) is a cross-sectional view of C— FIG. FIG. 3A is a diagram showing a method for measuring the maximum depth change amount of the positive pressure can of the present invention, and FIG. 3B is a diagram showing a method for measuring the restoration sound of the positive pressure can. 4A is a graph showing the relationship between the maximum value of the maximum depth change amount of the unit panel and the restored sound, and FIG. 4B is a graph showing the relationship between the average value of the maximum depth change amount of 0.4 mm or more and the restored sound. FIG. 5A is a graph showing the relationship between the average value of the maximum depth change amount of all unit panels and the restored sound, and FIG. 5B is a graph showing the relationship between the average value of the maximum depth change amount of 0.3 mm or more and the restored sound. . 6A and 6B show a positive pressure can according to Embodiment 1 of the invention of the second invention group, in which FIG. 6A is a front view of an internal pressure acting state, FIG. 6B is a front view of an internal pressure released state, (C) is a diagram showing one undulating surface of (B), (D) is a sectional view taken along line DD of (C), and (E) is a sectional view taken along line EE of (B). FIG. 7 shows a unit panel of the positive pressure can in FIG. 6, where (A) is a front view, (B) is a cross-sectional view along line BB of (A), and (C) is C— FIG. 8 (A) and 8 (B) are front views of the internal pressure action state showing a configuration in which the number of unit panels is changed with respect to the positive pressure can in FIG. 06, and (C) to (E) are views of the unit panel. It is explanatory drawing which shows the difference in the number of panels and the size of a unit panel. 9A and 9B show a positive pressure can according to Embodiment 2 of the invention of the second invention group, in which FIG. 9A is a front view of an internal pressure acting state, FIG. 9B is a front view of an internal pressure released state, (C) is a diagram showing one undulating surface of (B), (D) is a sectional view taken along line DD of (C), and (E) is a sectional view taken along line EE of (B). FIG. 10 shows a unit panel of the positive pressure can in FIG. 9, where (A) is a front view, (B) is a cross-sectional view along line BB in (A), and (C) is a cross-sectional view along C-- in (A). FIG. FIG. 11A is a diagram showing a method for measuring the maximum depth change amount of the positive pressure can of the present invention, and FIG. 11B is a diagram showing a method for measuring the restoration sound of the positive pressure can. FIG. 12 is a graph showing the relationship between the average value of the maximum depth change amount of the unit panel and the sound pressure level of the restored sound. FIG. 13A is a graph showing the relationship between the number of unit panels and the average value of the maximum depth change amount, and FIG. 13B is the average value of the maximum depth change amount and (the size of restored sound / number of panels). It is a graph which shows the relationship. FIG. 14 is a graph showing the relationship between the maximum value of the maximum depth change of the unit panel and the sound pressure level of the restored sound. FIG. 15 shows a positive pressure can according to Embodiment 1 of the invention of the third invention group, (A) is a front view in an internal pressure action state, (B) is a front view in an internal pressure release state, (C) is an enlarged schematic perspective view of a portion C in (B), and (D) is a sectional view taken along the line DD in (B). FIG. 16 shows a unit panel of the positive pressure can in FIG. 15, where (A) is a front view, (B) is a cross-sectional view along line BB in (A), and (C) is a cross-sectional view along C-- in (A). FIG. FIG. 17 shows a positive pressure can according to Embodiment 2 of the present invention, in which (A) is a front view of an internal pressure acting state, (B) is a front view of an internal pressure released state, and (C) is (B). (D) is a sectional view taken along the line DD of (C), and (E) is a sectional view taken along the line EE of (B). FIG. 18 shows a unit panel of the positive pressure can in FIG. 17, where (A) is a front view, (B) is a cross-sectional view along line BB in (A), and (C) is a cross-sectional view along C-- in (A). FIG. FIG. 19A is a diagram showing a method for measuring the maximum depth change amount of the positive pressure can of the present invention, and FIG. 19B is a diagram showing a method for measuring the restoration sound of the positive pressure can. FIG. 20 is a graph showing the relationship between the maximum value of the maximum depth change amount of the unit panel and the sound pressure level of the restored sound. FIG. 21 is a graph showing the relationship between the average value of the maximum depth change amount and the restored sound, excluding unit panels whose maximum depth change amount is less than 0.4 mm. FIG. 22A shows the relationship between the average value of the maximum depth change amount of all the unit panels and the restored sound, and FIG. 22B shows the relationship between the average value excluding the unit panel whose maximum depth change amount is less than 0.3 mm and the restored sound. It is a graph which shows.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
The dimensions, materials, shapes, and relative arrangements of the components described in this embodiment should be changed as appropriate according to the configuration of the apparatus to which the invention is applied and various conditions. The present invention is not intended to be limited to the following embodiments.
The following explanation will be given in the order of the invention of the first invention group, the invention of the second invention group, and the invention of the third invention group. When there are a plurality of embodiments of the invention of each invention group, The number of a form is demonstrated from 1 to a serial number as an embodiment of the invention of each group. Further, in each embodiment, the same components will be described with the same reference numerals. [Embodiment 1 of the first group of the invention]
1A and 1B show a positive pressure can according to Embodiment 1 of the first group of the invention. FIG. 1A shows an internal pressure acting state, and FIG. 1B shows an internal pressure released state.
The positive pressure can 1 includes a bottomed cylindrical can body 2 having a can body 21 and a can lid 3 that seals the can body 2 in a positive pressure state, and a polyhedral wall 4 is provided on at least a part of the can body 21. Have. The can body 2 includes a cylindrical can body 21 extending straight, a neck portion 22 with a reduced diameter at the upper end of the can body 21, and a bottom portion 23, and a can lid 3 at the mouth of the upper end of the neck portion 22. Is tightened.
The positive pressure can 1 is a squeezed iron can made of aluminum alloy, and generally has a capacity of 160 to 500 ml, a can internal pressure of 20 to 300 [kPa] at 5 ° C., and a plate thickness of the can body 21 of 0.075. It is used in the range of 0.135 [mm], can body diameter 50-70 [mm], and can height 90-170 [mm].

The polyhedron wall 4 is formed into a concavo-convex shape by a folding structure without changing the circumference of the can body 21, and is composed of a large number of unit panels 5 partitioned by folds of oblique ridge lines 51. That is, a predetermined number of unit panels 5 are arranged in a direction parallel to the central axis N of the can body 21 (hereinafter simply referred to as an axial direction) to form a panel row 50, and the panel row 50 is arranged in the circumferential direction of the can body 21. The configuration is arranged all around. The phase in the axial direction of the unit panels 5 of the panel rows 50 adjacent to each other is shifted by half the axial length of the unit panels 5 and the unit panels 5 are densely arranged in the axial direction and the circumferential direction. .
In this example, the polyhedral wall 4 is provided in a strip shape in the middle of the axial direction of the can body 21, and the upper and lower regions of the polyhedral wall 4 are cylindrical surfaces having no irregularities. Although the area of the polyhedral wall 4 is about 50% with respect to the can body in the illustrated example, it is preferable that the area of the polyhedral wall 4 is 25% or more of the can body in consideration of the restored sound.

FIG. 1C is an enlarged view of a portion C in FIG.
In a free state where the internal pressure does not act (when empty cans and when internal pressure is released), the unit panel 5 faces the inside of the can with a valley fold horizontal ridge line 52 positioned on a plane perpendicular to the central axis N of the can body 21 as a boundary. It is recessed so that it bends in a square shape. Since the adjacent panel rows 50 are displaced in the axial direction by half the length of the unit panel 5, the unit panels 5 of the panel rows 50 located every other circumferential direction are in the same phase in the axial direction, The horizontal ridge line 52 is connected via a common vertex 53. Therefore, the cross section cut in the direction orthogonal to the central axis N of the can body 21 at the position of the horizontal ridgeline 52 of the unit panel 5 has a regular polygonal shape as shown in FIG. In the illustrated example, the shape is a dodecagon, but is not limited to a dodecagon. The corners of the vertex 53 are chamfered. Further, the horizontal ridge line 52 is described in a straight line in the illustrated example, but when the can is empty and when the internal pressure is released, it is about ± 0.5 mm, a convex arc shape inside the can, or a convex shape outside the can. It may be a curved shape such as an arc.
In the internal pressure acting state, each unit panel 5 is caused to have an arc shape in which the horizontal ridge line 52 follows the cylindrical surface of the can body as shown by a two-dot chain line in FIG. 1C due to the internal pressure acting on the can body 21. Deform. The oblique ridge line 51 is also deformed so as to follow the cylindrical surface of the can body 21, but is simply illustrated as a straight line in FIG.
Then, when the tab 6 of the can lid 3 is opened to open the gas, an internal gas is released from the opening portion to generate a gas emission sound, and the oblique ridge line 51 and the horizontal ridge line 52 of each unit panel 5 are instantaneously formed into a linear shape. As a result, the concavo-convex shape appears and a restored sound is generated by the impact.
Various factors such as the shape, area, and plate thickness of the unit panel 5 can be considered as the factors that determine the magnitude of the restored sound. The present inventors have intensively studied, and as a result, have determined the depth of the unit panel 5 as the depth. It has been found that there is a correlation with the maximum depth change amount, which is the amount of change in.

Hereinafter, the maximum depth change amount of the unit panel 5 will be described with reference to FIG.
2A is a front view of the unit panel 5, FIG. 2B is a sectional view taken along the line BB in FIG. 2A, and FIG. 2C is a sectional view taken along the line CC in FIG. 2B and 2C, the broken line indicates the internal pressure acting state, and the solid line indicates the restored state when the internal pressure is released.
The panel depth of the unit panel 5 in the first embodiment is a distance in a direction orthogonal to the central axis N of the can body 21 from the line connecting the vertex 53a and the vertex 53c to the midpoint m of the horizontal ridge line 52. The change amount dmax is the change amount of the panel depth in the internal pressure acting state and the internal pressure release state.
As shown in FIG. 2A, the unit panel 5 has a rhombus shape defined by four oblique ridge lines 51, and vibrates like a drum having the four oblique ridge lines 51 as a frame. The restoration sound appears.
This unit panel 5 includes a total of four vertices 53a and 53c positioned on a central plane M passing through the central axis N of the can body 21 and two vertices 53b and 53d positioned symmetrically with respect to the central plane M. Has two vertices. These four vertices 53a to 53d are located on a virtual cylindrical surface Y (indicated by a two-dot chain line in FIG. 2B) that substantially coincides with the cylindrical surface constituting the can body 21, and a free state in which no internal pressure is applied. Then, as shown by the solid line in FIG. 2 (B), the inner side of the can body 21 is formed in a U shape by the transverse ridgeline 52 of the valley fold connecting the vertices 53b and 53d located at symmetrical positions with respect to the center plane M. The structure is bent and recessed.
In the internal pressure acting state, as indicated by broken lines in FIG. 2B, the upper triangular portion 5A and the lower triangular portion 5B are deformed so as to extend in the axial direction, and the middle point m of the horizontal ridge line 52 is the upper and lower apexes. It is displaced to a position close to the line connecting 53a and 53c. When viewed in a cross section, as shown by a broken line in FIG.
On the other hand, when the internal pressure is released, as indicated by a solid line in FIG. 2 (B), the unit panel 5 is restored to the shape of a dogleg and the midpoint m of the horizontal ridge line 52 returns to the deepest part. When viewed in a cross section, as shown in FIG. 2C, the shape is restored from a broken arc to a solid straight line.
The midpoint m is the portion where the unit panel 5 is most displaced, and the change in the panel depth at the midpoint m is defined as the maximum depth change dmax, and the maximum value of the maximum depth change dmax of all the unit panels 5 is evaluated. Thus, the maximum value of the maximum depth change amount dmax is set to 0.75 mm or more and 1.2 mm or less.

When the maximum depth change amount dmax is small, the restored sound is small and is lost in the immediately preceding gas emission sound, but by setting the maximum value of the maximum depth change amount dmax of all unit panels to 0.75 mm or more, Even after the gas emission sound, it is possible to generate a restoration sound that is sufficiently easy to hear.
Regarding the restoration sound of each unit panel of the polyhedral wall at the time of opening, according to an experiment, the sound pressure level of the restoration sound at the time of opening was able to be about 75 dB or more at a position 40 cm away from the can body. . The gas emission sound is about 70 dB, which is a sound level that can be sufficiently heard.
On the other hand, when the maximum depth change amount dmax is increased, a restoration sound is likely to sound. However, since the depth of the horizontal ridge line 52 of the unit panel 5 is increased, the axial load strength when empty can is reduced. If the upper limit of the maximum value of the maximum depth change amount is 1.2 mm or less, the restoration sound can be increased while maintaining the axial load strength at the time of the empty can.
Further, the average value of the maximum depth change amount dmax for the unit panel having the maximum depth change amount of 0.4 mm or more can be set to 0.54 mm or more and 0.75 mm or less.
When the average value is used in this way, the maximum depth change amount of each unit panel can be averaged and evaluated. Since some unit panels may not be completely restored, taking the average value excluding unit panels whose maximum depth change is less than 0.4 mm may exclude the effects of unit panels that are not completely restored. it can.
In addition, the maximum value of the maximum depth change amount dmax is set to 0.75 mm or more and 1.2 mm or less, and the average value of the maximum depth change amount for the unit panel having the maximum depth change amount of 0.40 mm or more is 0. It can also be set in the range of .54 mm or more and 0.75 mm or less.
The average value of the maximum depth change amount dmax for the unit panel having the maximum depth change amount of 0.4 mm or more is preferably set to 0.57 mm or more and 0.75 mm or less.
In this way, by using the maximum value and the average value of the maximum depth change amount, it is possible to realize a positive pressure can in which unevenness is increased and the visual effect is high, and a large restoration sound is stably generated.

[Relationship between number of corners of polyhedral wall 4 and maximum depth change dmax]
The maximum depth change amount dmax tends to increase as the unit panel 5 increases. If the body diameter of the can body 21 is the same, the size of the unit panel 5 is geometrically determined by the number of corners of the cross section shown in FIG. 1 (C). Becomes smaller. Conversely, the smaller the number of corners, the larger the unit panel 5 becomes, and the easier it is to deform, and the maximum depth change amount dmax increases. For example, when the can body diameter is in the range of 50 to 70 mm, the maximum value of the maximum depth change amount dmax can be set in the range of 0.75 mm or more and 1.2 mm or less if the angle is set to about 11 corners or 12 corners. it can. Further, the average value of the maximum depth change amount for the unit panel having the maximum depth change amount of 0.40 mm or more can be set in a range of 0.54 mm or more and 0.75 mm or less.
In particular, the area of the unit panel 5 is preferably set to 130 mm ² or more and 180 mm ² or less at 11 and 12 corners. However, as long as the maximum depth change amount dmax is within the above range, it may be 13 corners.
Here, the area of the unit panel 5 is an area in a flatly developed state, that is, an area obtained by adding up the areas of the upper triangular portion 5A and the lower triangular portion 5B of the unit panel 5.

[Adjustment of maximum depth change amount dmax]
The maximum depth change amount dmax can be adjusted, for example, by adjusting the panel depth when empty. The panel depth at the time of empty can can be adjusted by curving the horizontal ridge line 52 in an arc shape inside or outside the can. That is, if the arc is curved inside the can, the maximum depth change dmax is increased, and if the arc is curved outside the can, the maximum depth change dmax is decreased.

[Evaluation test]
Hereinafter, the evaluation test of the restored sound will be described.
In the evaluation test, the following sample having a rhombus unit panel was prepared.
(Sample 1) Number of corners: 13 corners, number of panels: 91, empty can depth: 0.81 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 2) Number of corners: 13 corners, number of panels: 91, empty can depth 0.85 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 3) Number of corners: 13 corners, number of panels: 91, empty can depth 0.89 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 4) Number of corners: 13 corners, number of panels: 91, empty can depth 0.92 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 5) Number of corners: 11 corners, number of panels: 66, empty can depth 1.38 mm, unit panel area: 177 mm ² , polyhedral wall area: 70% of can body
(Sample 6) Number of corners: 11 corners, number of panels: 66, empty can depth 1.45 mm, unit panel area: 177 mm ² , polyhedral wall area: 70% of can body
(Test conditions)
The conditions of the evaluation test are as follows.
・ Temperature: 5 ℃ storage (Liquid temperature is 6.5-8 ℃),
・ Can internal pressure: 120-150kPa
・ Thickness of can body 0.092 ~ 0.122mm
・ Can barrel diameter: 66.5-67mm
・ Can height: 121.8-122.2mm
・ Contents: 350ml
(Test method)
For the maximum depth change dmax, measure the panel depth in the internal pressure action state (5 ° C: the internal pressure before opening is 120 to 150 kPa), then measure the panel depth in the internal pressure release state, and measure the difference. Ask. As shown in FIG. 3A, the panel depth measurement method is such that the bottom side of the positive pressure can 1 is held horizontally by a vacuum, and the digimatic indicator 100 (“Digimatic” is a registered trademark of Mitutoyo Corporation). ) Is vertically applied to the apex 53 so that its height is zero, the positive pressure can 1 is slid in the direction of the central axis N, and the digimatic indicator 100 is moved to the middle point m of the horizontal ridge 53. In addition, the height is obtained by placing the probe 101 on the middle point m of the horizontal ridge line 53.
Digimatic indicator 100 is supported by support arm 103 that is fixed to stand 102 that is erected vertically on a horizontal base, and the posture is held vertically. On the other hand, a horizontal movement mechanism 104 that holds the positive pressure can 1 and moves it horizontally along the central axis N of the positive pressure can 1 is provided below the digimatic indicator 100 of the stand 102. The horizontal movement mechanism 104 includes a holding portion 105 that holds the mouth portion of the positive pressure can 1 and a telescopic portion 106 such as a cylinder mechanism or a feed screw mechanism that moves the holding portion 105 horizontally.
The panel depth is obtained for all the unit panels 5, and the difference between the panel depths in the internal pressure applied state and the internal pressure release state of each unit panel 5 is defined as the maximum depth change amount dmax, the maximum value, and the maximum depth change amount of each unit panel. The average value of dmax was calculated. The average value is an average value of the maximum depth change amounts for the unit panels excluding the unit panel whose maximum depth change amount dmax is less than 0.4 mm. Each sample has three cans, and regarding the maximum value of the maximum depth change amount, the average value of the three maximum cans is (ave), the maximum value is (max), and the minimum value is (min). In addition, regarding the average value of the maximum depth change amount dmax of each unit panel, the average value with respect to 3 cans of measurement is (ave), the maximum value is (max), and the minimum value is (min). Digimatic indicator manufactured by Mitutoyo Corporation, model number ID-C1012, and probe 101 used by Mitutoyo Corporation, model number 137413 were used.
On the other hand, as shown in FIG. 3B, the sound level of the restored sound was measured by installing a noise meter 120 at a position 40 cm away from the can. This 40 cm is a distance L between the microphone 121 and the positive pressure can 1. The meaning of 40 cm means the approximate distance between the can and the ear when actually opened. The sound level meter 120 was placed on the floor, and the microphone 121 was held at a height of about 60 cm from the floor by the stand 122. The measured value is obtained as time axis waveform data. When the positive pressure can 1 is opened, a tearing sound of the can lid due to the pull tab is generated first, and then the gas emission sound and the restoration sound are generated in this order. The level. The frequency weighting characteristic is A characteristic, and the time weighting characteristic is F. The number of measurements is 3 cans, and the average value is the measurement result.
As the sound level meter 120, model number NL-42 manufactured by Rion Co., Ltd. is used, and a wind screen WS-10 is attached to the tip of the microphone 121.

(Measurement result)
The measurement results are as shown in Table 1.

4 and 5 are graphs of the data in Table 1. FIG. 4A shows the relationship between the maximum value of the maximum depth change amount and the volume of the restored sound, and FIG. 4B shows the average value of the maximum depth change amount of 0.4 mm or more in the unit panel. The relationship of the magnitude of the restored sound is shown. FIG. 5 (A) shows the relationship between the average value of the maximum depth change amount of all unit panels and the magnitude of the restored sound, and FIG. 5 (B) shows the average value when the maximum depth change amount is 0.3 mm or more. And the magnitude of the restored sound. In each graph, samples 1 to 6 are shown as S1 to S6, respectively.
First, with reference to FIG. 4A, the relationship between the maximum value of the maximum depth change amount and the volume of the restored sound will be described.
Regarding the maximum value of the maximum depth change amount, the sample 5 (S5) and the sample 6 (S6) of the present invention have a large three-dimensional shape with a large change of at least 0.74 mm to 0.86 mm, and A restored sound of 76 dB or more is obtained. Moreover, since the unit panels of Samples 5 and 6 of the present invention are 11 corners, which is larger than the 13 corners of Samples 1 to 4 of the comparative example, not only deep but also a wide range changes greatly and changes visually. Because it stands out, it is attracting attention, making it sensitive to sound and listening to the restored sound.
On the other hand, for the sample 3 (S3) and the sample 4 (S4) of the comparative example, although the restored sound exceeds 75 dB, the maximum depth change amount is up to 0.74 mm in the sample 4 (S4). Then, it is up to 0.66 mm. In addition, with respect to sample 1 (S1) and sample 2 (S2), the restored sound is also between 72 dB and 78 dB and does not exceed 75 dB.
From these results, when the maximum value of the maximum depth change amount dmax is evaluated and the maximum value of the maximum depth change amount dmax is 0.75 mm or more, a deep three-dimensional shape is obtained by changing greatly, and A large restoration sound of 76 dB or more can be obtained. The sound pressure level when the score is broken is about 60 dB, the gas emission sound is 70 dB, and if the gas emission sound is 70 dB higher than the gas emission sound by 5 dB or more, the sound pressure level is about twice as large as the gas emission sound. To be clear.
In addition, when a unit panel is a rhombus shape, the number of cross-sectional angles is between 11 and 13 and 12 is included. Even with 13 corners, if the maximum value of the maximum depth change amount is set to 0.75 mm or more, the unevenness becomes deep and clear, and the visual effect is enhanced and a large restoration sound can be obtained.
[Axial load strength]
In order to increase the maximum depth change amount, it is necessary to enlarge the unit panel. If the unit panel is made larger, the axial load strength at the time of the empty can tends to decrease. If the upper limit is set to about 1.2 mm, the axial load strength at the time of the empty can can be maintained.

Next, with reference to FIG. 4B, FIG. 5A, and FIG. 5B, the relationship between the average value of the maximum depth change amount and the magnitude of the restored sound will be described.
When using the maximum value of the maximum depth change amount as shown in FIG. 4A, there is a possibility that the variation becomes large. Therefore, it was considered to take an average value of the maximum depth change amount of the unit panel. However, when taking the average value of the maximum depth change amounts of all the unit panels, as shown in FIG. 5A, the sample 5 (S5) and the sample 6 (S6) of the present invention are compared with the sample (S1) of the comparative example. ) To Sample 4 (S4), and the opposite result is that the average value of the maximum change in depth is smaller. As a result of examining this result, it was found that not all unit panels were completely restored, and some unit panels were not fully restored. Therefore, the average value for the unit panel having the maximum depth change amount of 0.3 mm or more and the average value for the unit panel having the maximum depth change amount of 0.4 mm or more are calculated and graphed as shown in FIG. B) and FIG. 5B.
In the case of extracting a unit panel of 0.3 mm or more, as shown in FIG. 5 (B), sample 5 (S5) and sample 6 (S6) are in a range where they intersect with sample 1 to sample 4, and are unclear. However, when a unit panel of 0.4 mm or more is extracted, as shown in FIG. 4B, sample 5 (S5) and sample 6 (S6) escape from the range where sample 1 to sample 4 intersect, and sample 5 It was found that the maximum depth change amount (average value) of (S5) and Sample 6 (S6) is larger than the maximum depth change amount (average value) of Sample 1 to Sample 4, and is clearly divided.

According to FIG. 4B, the average value of the unit panel having a maximum depth variation of 0.4 mm or more is 0.57 mm to 0.67 mm for the sample 5 (S5) and the sample 5 (S6) of the present invention. In contrast, Samples 1 (S1) to 4 (S4) of Comparative Example were 0.48 to 0.53 mm.
From these results, if the average value of unit panels with a maximum depth change of 0.4 mm or more is set to 0.54 mm or more, preferably 0.57 mm or more, the influence of unit panels that are not completely restored is excluded. Similarly to the maximum value, sample 5 (S5) and sample 6 (S6) of the present invention can be distinguished from sample 1 (S1) to sample 4 (S4) of the comparative example.
By using the average value in this way, the threshold value does not become too large as in the case of using the maximum value of the maximum depth change amount, and the maximum depth change amount can be stably evaluated, and a stable restoration above a certain level. A positive pressure can that can produce sound can be realized.
In addition, when considering the axial load strength at the time of empty cans, the upper limit when evaluating with the maximum value is set to about 0.75 mm as about 60% of the upper limit with respect to 1.2 mm, Axial load strength during empty can can be maintained.
The maximum value of the maximum depth change amount for the unit panel in which the maximum value of the maximum depth change amount of the unit panel is in the range of 0.75 mm to 1.2 mm and the maximum depth change amount is 0.4 mm or more is , 0.54 mm or more and 0.75 mm or less can also be set.
In this way, it is possible to realize a positive pressure can in which the maximum depth change amount is stable, the maximum value is large, and a larger and stable restoration sound can be obtained.
In addition, about the unit panel which comprises a polyhedral wall, it is not restricted to the bent rhombus shape of the said Embodiment 1, By a folding structure, it is a shape dented inward of the can body, and a hollow is small by the internal pressure which acts on a can body. It can be applied to various patterns that are deformed in a direction to be restored to the original shape when the can lid is opened.

Next, the invention constituting the second invention group will be described in detail based on the illustrated embodiment.
[Embodiment 1 of the second invention group]
FIG. 06 shows the positive pressure can according to the first embodiment of the present invention of the second group. FIG. 06 (A) shows the internal pressure acting state, and FIG. 06 (B) shows the internal pressure released state.
The positive pressure can 1 includes a bottomed cylindrical can body 2 having a can body 21 and a can lid 3 that seals the can body 2 in a positive pressure state. A polyhedral wall 24 is provided on at least a part of the can body 21. Have. The can body 2 includes a cylindrical can body 21 extending straight, a neck portion 22 with a reduced diameter at the upper end of the can body 21, and a bottom portion 23, and a can lid 3 at the mouth of the upper end of the neck portion 22. Is tightened.
The positive pressure can 1 is a squeezed iron can made of an aluminum alloy, and generally has a capacity of 160 to 500 ml, a can internal pressure of 20 to 300 [kPa] at 5 ° C., and the thickness of the thinnest portion of the can body 21. Is 0.075 to 0.135 [mm], the can body diameter is 50 to 70 [mm], and the can height is 90 to 170 [mm].

The polyhedral wall 24 is formed with a plurality of corrugated curved surfaces 30 in which crests 26 and troughs 27 are alternately formed in the axial direction. As shown in FIGS. 06 (C) and (D), the corrugated curved surface 30 is partitioned by waveform ridge lines 251 and 252 that are symmetrical with respect to the center plane M passing through the center axis N of the can body 21. A narrow part between the ridge lines 251 and 252 is a peak part 26 of the undulating curved surface 30, and a wide part is a valley part 27. The unit panel 25 is a region from the top part 26a of one peak part 26 of the undulating curved surface 30 to the top part 26a of the next peak part 26 through the valley part 27. The top part 26a of the peak part 26 allows the upper and lower unit panels 25 to be It is divided. That is, in this embodiment, the entire circumference of the unit panel 25 is not demarcated by the corrugated ridge lines 251 and 252, but a part of the unit panel 25 is open and is divided by the top portion 26 a of the peak portion 26. . In this example, although it is divided by the peak part 26, the part with the narrow space | interval of the waveform ridge lines 251 and 252 may contact, and in that case, the perimeter is divided by the boundary ridgeline.
The phase in the axial direction of the unit panels 25 of the corrugated curved surfaces 30 and 30 that are adjacent to each other is shifted by half the axial length of the unit panels, and the unit panels 25 are densely arranged in the axial direction and the circumferential direction.

The cross section of the corrugated curved surface 30 in the direction orthogonal to the central axis N of the can body 21 is a cross section (horizontal cross section) cut in the direction orthogonal to the central axis N of the can body 21 at the position of the top portion 26a of the peak portion 26. As shown to (E), the part of the top part 26a of the peak part 26 is narrow, and the intermediate position of the unit panel 25 becomes a polygonal shape wide. The horizontal cross section at the intermediate position of the unit panel 25 is recessed in an arc shape toward the inside of the can body 21 with respect to the straight line shape with no internal pressure applied. In the illustrated example, 13 unit panels 25 are formed across the crest 26, but the number of wavy curved surfaces 30 is 26, and the adjacent wavy curved surfaces 30, 30 are offset by half phase. The horizontal cross section at the position of the top 26a of the 26 is 13 planes. Further, in the illustrated example, the unit panel 25 is formed with four undulating curved surfaces 30 and three undulating curved surfaces 30 alternately, and the number of unit panels 25 is 91 in total.
In the illustrated example, the polyhedron wall 24 is provided in a strip shape in the middle of the can body 21 in the axial direction, and the upper and lower regions of the polyhedron wall 24 are cylindrical surfaces having no irregularities. In the illustrated example, the area of the polyhedral wall 24 is about 70% with respect to the cylindrical portion excluding the neck portion 22 of the can body 21, but considering the magnitude of the restored sound, it is 25% or more of the can body. Preferably, it is suitable to be 50% or more.
As shown in FIG. 06 (A), the polyhedral wall 24 is a cylindrical surface having no irregularities as a whole, as shown in FIG. Each unit panel 25 is deformed into an arc shape in the horizontal cross section, and the depression is eliminated.
When the can lid 3 is opened, as shown in FIG. 06 (B), each unit panel 25 is restored to its original shape, and a restoration sound is emitted when the unit panel 25 is restored.
In this embodiment, since the unit panel 25 is curved in both the direction parallel to and perpendicular to the central axis N of the can body 21, the amount of elastic strain during the internal pressure action increases, and is released at a time when the internal pressure is released. The restoration sound is loud.

The deformation state of the unit panel 25 will be described in detail with reference to FIG.
FIG. 07A is a front view of the unit panel 25, FIG. 07B is a cross-sectional view taken along the line BB in FIG. 7A, and FIG. In FIGS. 07 (B) and (C), the broken line indicates the internal pressure acting state, and the solid line indicates the restored state when the internal pressure is released.
The panel depth of the unit panel 5 in this embodiment is a distance in a direction orthogonal to the central axis N of the can body 21 from the line connecting the two upper and lower apexes 26a to the panel center m2, and the maximum depth variation dmax is The change amount of the panel depth in the internal pressure acting state and the internal pressure released state.
As shown in FIG. 07 (A), the unit panel 5 is a pair that does not cross each other in the region from the top 26a of one peak 26 of the undulating curved surface 30 to the top 26a of the next peak 26 through the valley 27. Are divided by waveform ridge lines 251 and 252.
The corrugated ridge lines 251 and 252 are formed by alternately and repeatedly forming concave arc ridge lines 251b and 252b and convex arc ridge lines 251a and 252a in the axial direction. The convex arc ridge lines 251a and 252a are symmetrically opposed to each other. In the region of the valley portion 27, the concave arc ridge lines 251b and 252b are opposed to each other in a barrel shape, and the upper and lower peak portions 26 are opposed to the apexes a1 and a2 of the convex arc ridge lines 251a and 252a and gradually narrow. It becomes the shape that becomes.
The vertices a1 and a2 of the convex arc ridge lines 251a and 252a are located at the top part 26a of the peak part 26 of the corrugated curved surface 30, and there is no ridge line that becomes a crease on the top and bottom of the unit panel 25. It is divided. Further, the positions of the vertices b1 and b2 that are the maximum widths of the concave arc ridge lines 251b and 252b are located at the apex 26a of the peak portion 26 of the adjacent unit panel 25, and the concave arc ridge lines 251b and 252b of the unit panel 25 are located. The vertices b1 and b2 and the vertices a1 and a2 of the convex arc ridge lines 251a and 252a are located on a virtual cylindrical surface that substantially coincides with the cylindrical surface of the can body 21. The virtual cylindrical surface corresponds to the position of the broken line when the internal pressure is applied to the unit panel 25 in FIGS. 07 (B) and (C).
The panel center m2 of the unit panel 25 is an intersection with the virtual horizontal line X on the center plane M and connecting the vertices b1 and b2 of the concave arc ridge lines 251b and 252b having the maximum width. This is the deepest portion of the valley portion 27 of the curved surface 30 from the virtual cylindrical surface. The panel center m2 is also an intermediate position between the top portions 26a and 26a of the upper and lower mountain portions 26.

The panel center m2 has a shape that is recessed in an arc toward the inside of the can body 21, as indicated by the solid line in FIG. In the internal pressure acting state, as indicated by a broken line in FIG. 07 (B), the unit panel 25 that is recessed in an arc shape is deformed so as to extend in parallel with the central axis N of the can body 21, and the panel center m2 is It is displaced to a position close to the line connecting the top portions 26a, 26a of the peak portion 26. When viewed in a horizontal section, as shown by a broken line in FIG.
On the other hand, when the internal pressure is released, as indicated by a solid line in FIG. 07 (B), the unit panel 5 is restored to an arc shape, and the panel center m2 returns to the deepest part. When viewed in the horizontal cross section, as shown in FIG. 09C, the arc shape is restored from the arc shape of the broken line to the inside of the solid line.
The panel center m2 is the portion of the unit panel 25 that is most displaced, and the amount of change in the panel depth when the panel center m2 is in the internal pressure applied state and the internal pressure released state is the maximum depth change amount dmax. The average value of the maximum depth change amount dmax is set in a range of 0.46 mm or more and 1.08 mm or less.
This internal pressure condition setting does not limit the range of use of the positive pressure can, but sets the measurement conditions. For example, even if it is used at a pressure lower than 120 kPa or a pressure higher than 150 kPa, it shall be included within this range when measured in this pressure range.
In the present embodiment, the boundary ridge lines are arc-shaped waveform ridge lines 251 and 252 having no corners, and the maximum depth change amount dmax is greatly changed, and a larger restoration sound is generated. Since it is easily deformed, the interval between the gas emission sound and the restoration sound is shortened, but it can be sufficiently heard.
Note that the restoration area that is deformed when each unit panel 25 is restored is a virtual arc 31 (two-dot chain line in the figure) passing through the recess boundary ridge line 251b constituting the valley 27 as shown in FIG. , And is narrower than the area of the unit panel 25. The shape is basically a perfect circle, but may be elliptical due to the restriction of the axial range of the polyhedral wall.
As shown in the evaluation test results to be described later, by setting the average value of the maximum depth change amount dmax to a range of 0.46 mm or more and 1.08 mm or less, the restoration sound is a level larger than the gas emission sound 70 dB. It was found that it can be maintained. The average value of the maximum depth change amount dmax is related to the size of the unit panel 25. The larger the size of the unit panel 25 is, the larger the maximum depth change amount dmax is. The relationship between the size of the unit panel 25 and the number of unit panels 25 is such that the larger the unit panel size, the smaller the number of unit panels 25.
As a result of diligent research, the restored sound of this panel is related to the size per unit panel 25 and the number of panels. If the average value of the maximum depth change dmax is large, the sound pressure level per panel is large. However, since it is necessary to increase the size of the unit panel 25, the number of panels decreases, and the restoration sound as a whole decreases. If it is 1.08 mm or less, the restoration sound can be maintained at a level higher than the gas emission sound 70B even if the number of panels is reduced.
If the average value of the maximum depth change dmax is small, the sound pressure level per panel decreases, but the panel size can be reduced to increase the number of panels, and the overall restored sound can be increased. Can do. However, there is a limit, and if it is 0.46 mm or more, the restored sound can be increased.
The number of unit panels 25 is 91 in this example, but is preferably set to 65 or more and 117 or less.
If the number of unit panels 25 is greater than 117, the size of the unit panel 25 will be too small and the restored sound will not be too great. On the other hand, if the number is less than 65, the panel can be enlarged, but the number of the panels is reduced, and the restoration sound is lowered.

An example in which the number of unit panels is changed will be described with reference to FIG.
FIG. 08A shows an example with 65 unit panels, and FIG. 08B shows an example with 117 units.
In any case, the number of undulating curved surfaces 30 is 26 as in FIG. 06, and the number of unit panels 25 of adjacent undulating curved surfaces 30 is different by one. Assuming that one less side wavy curved surface is 30 (n) and one more side wavy curved surface is 30 (n + 1), in the case of 65, the unit panel 25 has two wavy curved surfaces 30 (n). Three wavy curved surfaces 30 (n + 1) are alternately arranged in the circumferential direction. In the case of 117 shown in FIG. 08 (B), the unit panel 25 has four wavy curved surfaces 30 (n) and five wavy curved surfaces 30 (n + 1) arranged alternately in the circumferential direction.
As shown in the figure, the size of the unit panel 25 decreases as the number of panels increases. That is, the unit panel 25 having 65 panels is the largest (FIG. 08A), the unit panel 25 having 91 panels is intermediate (FIG. 06A), and the unit panel 25 having 117 panels is present. It is the smallest (FIG. 08 (B)).
In the case of 117 in FIG. 08B, the area of the polyhedral wall 24 is about 70% with respect to the cylindrical portion excluding the neck portion 22, as in the case of 91 in FIG. However, in the case of 65 pieces in FIG.
FIGS. 08C to E show the sizes of the unit panels 25 in comparison.
In the figure, g is the maximum horizontal width of the valley 27 of each unit panel 25, h is the minimum width of the unit panel 25 (minimum width of the peak 26), and i is the axial length. It shall be distinguished by including a number. The maximum width g is the dimension between the vertices b1 and b2 in FIG. 07 (A), and the minimum width h is the dimension between the vertices a1 and a2 in FIG. 07 (A). The axial length i is a dimension between the top portions 26a and 26a of the upper and lower peaks 26 in FIG.
The maximum width g is
g (65)> g (91)> g (117)
And the axial length i is
i (65)> i (91)> i (117)
And it gets smaller as the number of panels increases.
On the other hand, the minimum horizontal width h is
h (65) <h (91) <h (117)
And it increases as the number of panels increases.
Since the number of wavy curved surfaces is 26, the sum of the maximum width g and the minimum width h is the same for all 65, 91, and 117, and the ratio of the maximum width g to the minimum width h is different. ing.
Further, as described above, the restoration region that is deformed when each unit panel 25 is restored is a virtual arc 31 (two-dot chain line in FIG. 07A) passing through the recess boundary ridge line 251b that constitutes the valley portion 27. If the area of the restoration region including the valley 27 is S, the area S of the restoration region is
S (65)> S (91)> S (117)
And it gets smaller as the number of panels increases.
In short, the setting of the number of the unit panels 25 in this embodiment is based on the assumption that the can height and the body diameter are the same and the number of wavy curved surfaces 30 is constant (26 faces). By changing the direction length i, the number of unit panels in each corrugated curved surface 30 is changed, thereby setting the number of panels of the entire can. That is, when the number of panels is increased, the axial length i is shortened, and when the number of panels is decreased, the axial length i is increased. The area S of the restoration region and the area S1 of the unit panel 25 are determined by the axial length i. Since the polyhedral wall 24 is basically a folded structure and has a constant circumference, and the shape and size of each unit panel 25 are the same, for example, the maximum width g and the minimum width h are independent of the shape of the unit panel 25. Regardless of the dimensions, if the can body diameter is D, the unit panel area S1 is determined by the following relationship.
S1 = π * D * i / 26
The number of 65, 91, and 117 panels described above is an example in which the number of panels is increased by one for each corrugated curved surface 30, and the number of panels is increased by 26 in stages. However, if the axial length i of the corrugated curved surface 30 is dimensionally allowed for the can body, the number of panels can be increased while the axial length i of the unit panel 25 remains the same. .
The maximum depth change dmax of the unit panel 25 is affected by the size of the restoration area, that is, the axial length i related to the area S of the restoration area and the maximum width g. This axial length i correlates with the number of unit panels 25. If the number is large, the axial length i is shortened and the maximum width g is also reduced, so that the maximum depth change amount dmax is reduced. If the number is small, the axial length i becomes long and the maximum width g can be made large, so that the maximum depth change amount dmax becomes large.
In the above embodiment, the number of wavy curved surfaces 30 is 26, but the number of wavy curved surfaces 30 may be changed.

[Adjustment of maximum depth change amount dmax]
The maximum depth change amount dmax can be adjusted, for example, by adjusting the panel depth when empty. That is, the horizontal section of the trough 27 (the section perpendicular to the central axis N of the can body 21) has an arc shape that is recessed toward the inside of the can body 21, but the degree of curvature is changed so as to be empty. By changing the panel depth at the time of the can, the maximum depth change amount dmax can be adjusted. That is, if the panel depth at the time of an empty can is increased, the maximum depth change amount dmax is increased, and if the panel depth at the time of an empty can is decreased, the maximum depth change amount dmax is decreased.
Furthermore, the horizontal cross section in the valley portion 27 may be curved in a straight line shape or in an arc shape outside the straight line shape. In this way, the maximum depth change amount dmax can be further reduced.

[Embodiment 2 of the second group of the invention]
Hereinafter, with reference to FIGS. 09 and 10, an example in which the horizontal section in the valley portion 27 is linear will be described (Embodiment 2). In the following description, only differences from the first embodiment will be mainly described, and the same components are denoted by the same reference numerals and description thereof is omitted.
FIG. 09 shows an example in which the cross-sectional shape of the unit panel 25 in a direction orthogonal to the central axis N of the can body passes through the center of the unit panel 25 in a free state where no internal pressure is applied (empty can state). Yes.
In this case, the cross section (horizontal cross section) cut in the direction orthogonal to the central axis N of the can body 21 at the position of the top portion 26a of the mountain portion 26 is a portion of the top portion 26a of the mountain portion 26 as shown in FIG. Is narrow, and the middle position of the unit panel 25 is a polygonal shape with straight sides.
In the illustrated example, twelve unit panels 25 are formed with the mountain portion 26 interposed therebetween. Since the number of the corrugated curved surfaces 30 is 24 and the adjacent corrugated curved surfaces 30 and 30 are shifted by half phase, the horizontal cross section at the position of the top portion 26a of the peak portion 26 is twelve. In addition, the unit panel 25 has four wavy curved surfaces 30 and three wavy curved surfaces 30 alternately formed in a total of 24, and the number of unit panels 25 is 84 in total.

FIG. 10 is a detailed view of the unit panel of FIG.
10A is a front view of the unit panel 25, FIG. 10B is a sectional view taken along the line BB of FIG. 10A, and FIG. 10C is a sectional view taken along the line CC of FIG. 10B and 10C, the broken line indicates the internal pressure acting state, and the solid line indicates the restored state when the internal pressure is released.
The panel depth of the unit panel 5 in the second embodiment is a distance in a direction orthogonal to the central axis N of the can body 21 from the line connecting the upper and lower two top portions 26a to the panel center m2, and the maximum depth change amount dmax. Is the amount of change in the panel depth in the internal pressure acting state and the internal pressure released state.

As shown by the solid line in FIG. 10B, the panel center m2 has a shape that is recessed in an arc toward the inside of the can body 21. In the internal pressure acting state, as indicated by a broken line in FIG. 10B, the unit panel 25 that is recessed in an arc shape is deformed so as to extend in parallel with the central axis N of the can body 21, and the panel center m2 is It is displaced to a position close to the line connecting the top portions 26a, 26a of the peak portion 26. When viewed in a horizontal section, as shown by a broken line in FIG.
On the other hand, when the internal pressure is released, as indicated by a solid line in FIG. 10B, the unit panel 5 is restored to an arc shape, and the panel center m2 returns to the deepest part. When viewed in a horizontal section, as shown in FIG. 10 (C), the shape is restored from a broken arc shape to a solid straight line shape.
Thus, even when the horizontal cross section of the unit panel 25 passing through the center m2 of the unit panel 25 is a straight line, the boundary ridge lines are arc-shaped waveform ridge lines 251 and 251 as in the first embodiment. The maximum depth change amount dmax changes greatly, and a large restored sound is generated.
Also in the second embodiment, by setting the average value of the maximum depth change amount dmax of each unit panel to be in the range of 0.46 mm or more and 1.08 mm or less, the restored sound is more than the gas emission sound 70 dB. Can be maintained at a large level.
Also in the second embodiment, the number of unit panels 25 is set to 65 or more and 117 or less as in the first embodiment. In the illustrated example, since the wavy surface 30 is 24 surfaces, for example, as shown in FIG. 08 (B) of the first embodiment, the combination of 4 and 5 wavy curved surfaces is 108, and 117 or less. It becomes a range. The combination of 2 and 3 corrugated surfaces shown in FIG. 08 (A) is 60, which is less than 65. For example, if the combination of 3 and 3 corrugated surfaces is used, it becomes 72, It can be 65 or more.
Of course, the number of undulating curved surfaces may be 26 as in the first embodiment. In that case, the number of unit panels is the same as in the first embodiment, and 65 (FIG. 06), 91. (FIG. 08A) 117 structures (FIG. 08B) can be employed.

[Evaluation test]
Hereinafter, the evaluation test of the restored sound will be described.
For the evaluation test, the following four samples were prepared. In either case, the horizontal cross-sectional shape of the unit panel is a shape recessed inward of the can body in a free state where no internal pressure is applied as described in the first embodiment.
(Sample 1) Number of corrugated curved surfaces: 26, panel area S: 82 mm ² , number of panels: 117, polyhedral wall area: 70% of can body, panel depth adjusted so that maximum depth change amount becomes large. The number of corrugated surfaces is also counted as one surface whose height is half-phase shifted.
(Sample 2) Number of corrugated curved surfaces: 26, panel area S: 109 mm ² , number of panels: 91, polyhedral wall area: 70% of can body, panel depth adjusted so that maximum depth change amount becomes large. The number of corrugated surfaces is also counted as one surface whose height is half-phase shifted.
(Sample 3) The number of corrugated curved surfaces: 26, the panel area S: 138 mm ² , the number of panel panels: 65, the polyhedral wall area: 60% of the can body, and the panel depth was adjusted so that the maximum depth change amount was large. The number of corrugated surfaces is also counted as one surface whose height is half-phase shifted.
(Sample 4) Number of corrugated curved surfaces: 26, panel area S: 109 mm ² , number of panels: 91, polyhedral wall area: 70% of can body, panel depth adjusted so that maximum depth change amount becomes large. The number of corrugated surfaces is also counted as one surface whose height is half-phase shifted.

(Test conditions)
The conditions of the evaluation test are as follows.
・ Temperature: 5 ℃ storage (Liquid temperature is 6.5-8 ℃),
・ Can internal pressure: 120-150kPa
・ Thickness of can body: 0.092-0.122mm
・ Can barrel diameter: 66.5-67mm
・ Can height: 121.8-122.2mm
・ Contents: 350ml
(Test method)
The maximum depth change amount dmax is obtained by measuring the panel depth when the internal pressure is applied, then measuring the panel depth when the internal pressure is released, and measuring the difference. As shown in FIG. 11 (A), the panel depth is measured by holding the bottom of the positive pressure can 1 horizontally with a vacuum, and a digimatic indicator 100 (“Digimatic” is a registered trademark of Mitutoyo Corporation). ) Is vertically applied to the top portion 26a of the peak portion 26 so that its height is zero, the positive pressure can 1 is slid in the direction of the central axis N, and the digimatic indicator 100 is moved to the valley of each unit panel 25. In accordance with the panel center m <b> 2 of the portion 27, the height is read and obtained by placing the measuring element 101 against the panel center m <b> 2 of the valley portion 27.
Digimatic indicator 100 is supported by support arm 103 that is fixed to stand 102 that is erected vertically on a horizontal base, and the posture is held vertically. On the other hand, a horizontal movement mechanism 104 that holds the positive pressure can 1 and moves it horizontally along the central axis N of the positive pressure can 1 is provided below the digimatic indicator 100 of the stand 102. The horizontal movement mechanism 104 includes a holding portion 105 that holds the mouth portion of the positive pressure can 1 and a telescopic portion 106 such as a cylinder mechanism or a feed screw mechanism that moves the holding portion 105 horizontally.
The panel depth is obtained for all the unit panels 25, and the difference between the panel depths in the internal pressure action state and the internal pressure release state of each unit panel 25 is defined as the maximum depth change amount dmax, and the average value of the maximum depth change amounts dmax of each unit panel is determined. calculate. The number of measurements was 3 cans, and the average value (ave), maximum value (max), and minimum value (min) of the average value and the maximum value of the maximum depth change amount dmax of each unit panel were obtained. Digimatic indicator manufactured by Mitutoyo Corporation, model number ID-C1012, and probe 101 used by Mitutoyo Corporation, model number 137413 were used. For sample 4, it is only the maximum value.
On the other hand, as shown in FIG. 10 (B), the restoration sound was measured by installing a noise meter 120 at a position 40 cm away from the can and measuring the loudness. This 40 cm is a distance L between the microphone 121 and the positive pressure can 1. The meaning of 40 cm means the approximate distance between the can and the ear when actually opened. The sound level meter 120 was placed on the floor, and the microphone 121 was held at a height of about 60 cm from the floor by the stand 122. The measured value is obtained as time axis waveform data. When the positive pressure can 1 is opened, a tearing sound of the can lid due to the pull tab is generated first, and then the gas emission sound and the restoration sound are generated in this order. The level. The frequency weighting characteristic is A characteristic, and the time weighting characteristic is F. The number of measurements was 3 cans, and the average value (ave), maximum value (max), and minimum value (min) of the restored sound were determined.
As the sound level meter 120, model number NL-42 manufactured by Rion Co., Ltd. is used, and a wind screen WS-10 is attached to the tip of the microphone 121.
(Measurement result)
The measurement results are as shown in Table 2.

(Relationship between average value of maximum depth change and restoration sound)
First, the relationship between the average value of the maximum depth change amount and the volume of the restored sound will be described using Sample 1-3.
In Sample 1 having 117 panels, the average value of the maximum depth change amount is the minimum value (min): 0.46 mm, the maximum value (max): 0.47 mm, and the average value (ave): 0.46 mm. The volume of sound was 80 to 83 dB, and (the volume of restored sound / number of panels) was 0.68 to 0.71 dB.
In the sample 2 with 91 panels, the average value of the maximum depth change amount is the minimum value (min): 0.76 mm, the maximum value (max): 0.77 mm, and the average value (ave) 6: 0.76 mm. The volume of the restored sound was 80 to 81 dB, and (the volume of the restored sound / number of panels) was 0.88 to 0.89 dB.
In sample 3 having 65 panels, the average value of the maximum depth change amount is restored as the minimum value (min): 1.06 mm, the maximum value (max): 1.08 mm, and the average value (ave): 1.07 mm. The volume of sound was 76 to 78 dB, and (the volume of restored sound / number of panels) was 1.17 to 1.20 dB.
In Table 2, (Restored sound volume / number of panels) is a value obtained by simply dividing the restored sound volume by the number of panels. Each panel is considered to be an independent sound source. It does not reflect the dB value of one sound pressure level. When the measured restored sound is calculated as the sum of the sound pressure levels of each panel, the sound pressure level per panel is 61.3 dB for sample 1, 61.4 dB for sample 2, and 57 for sample 3. .9 dB.
FIG. 12 is a graph showing the measurement results with the average value of the maximum depth change amount on the horizontal axis and the restored sound on the vertical axis. Sample 1 (117 panels) is indicated by a circle (◯), sample 2 (91 panels) by a square (□), and sample 3 (65 panels) by a triangle (Δ).
That is, the restored sound has a sound pressure level of 76 dB to 83 dB when the average value of the maximum depth change amount dmax is 0.46 mm to 1.08 mm including the minimum value and the maximum value.
The sound pressure level at the time of breaking the score is about 60 dB, the gas emission sound is 70 dB, and even the sample 1 (76 dB) having the lowest restoration sound is 6 B higher than the gas emission sound and can clearly recognize the restoration sound. did it.
If it is 5 dB or more larger than 70 dB of the gas emission sound, the sound pressure level becomes about twice as large as that of the gas emission sound and becomes clear.

13A is a graph showing the relationship between the number of panels and the average value of the maximum depth change amount, and FIG. 13B is the relationship between the average value of the maximum depth change amount and (the size of restored sound / number of panels). It is a graph which shows.
As shown in FIG. 13A, in the range of 65 to 117 panels, the average value of the maximum depth change amount dmax is in a proportional relationship that decreases linearly as the number of panels increases. The following equation approximates the relationship between the average value (ave) of the average value of the maximum depth change amount dmax and the number of panels (N) by a straight line F with a slope of K1 and an intercept of M1 (least square method). .
dmax (ave) = K1 * N + M1
N is the number of panels K1 = -0.012 (mm / piece)
M1 = 1.86
If the gradient K1 is kept as it is and M1 is in the range of 1.80 ≦ M1 ≦ 1.90, the average value (ave), maximum value (max), and minimum value (min) of the average value of the maximum depth change amount dmax ) Are all included in the range of the above formula.
Therefore, if the number of panels is in the range of 65 to 117 and the relationship between dmax and N is within the above range, the restored sound is 76 dB or more.
On the other hand, as shown in FIG. 13B, the relationship between the average value of the maximum depth change amount dmax and the restored sound is calculated by calculating (the volume of restored sound (Q) / number of panels (N)). As the average value of the amount dmax increases, the proportional relationship increases linearly. The following equation approximates the relationship between the average value of (the volume of restored sound (Q) / number of panels (N)) and the maximum amount of change in depth (dmax) by a straight line G with a slope of K2 and an intercept of M2. (Least square method).
Q / N (dB / piece) = K2 * dmax + M2
K2 = 0.77
M2 = 0.33
If the gradient K2 is kept as it is and M2 is in the range of 0.29 ≦ M2 ≦ 0.37, the average value (ave), maximum value (max) and minimum value (min) of Q / N are all It is included in the range of the above formula.
From these relational expressions, if the maximum depth change amount is determined in the range of 65 to 117 panels, the number of panels and the volume of restored sound can be predicted. Further, an appropriate amount of the maximum depth change amount can be predicted according to the number of panels, the restored sound, and the number of panels, and the adjustment range of the maximum depth change amount can be set numerically.

(Relationship between maximum depth change and restoration sound)
Next, the relationship between the maximum value of the maximum depth change amount and the volume of the restored sound will be described with reference to FIG.
In sample 1, the maximum value of the maximum depth change amount is the minimum value (min): 0.59 mm, the maximum value (max): 0.65 mm, the average value (ave): 0.62 mm, and the volume of the restored sound is 80 It was ˜83 dB.
In the sample 2, the maximum value of the maximum depth change amount is the minimum value (min): 0.94 mm, the maximum value (max): 0.95 mm, the average value (ave): 0.94 mm, and the volume of the restored sound is 80 -81 dB.
In sample 3, the maximum value of the maximum depth change amount is the minimum value (min): 1.28 mm, the maximum value (max): 1.31 mm, the average value (ave): 1.30 mm, and the volume of the restored sound is 76. It was -78 dB.
In sample 4, the average value (ave) of the maximum value of the maximum depth change amount was 1.00 mm, and the volume of the restored sound was 83 dB.
That is, regarding the maximum value of the maximum depth change amount dmax, the restored sound has a sound pressure level of 76 dB to 83 dB within a range of 0.59 mm to 1.31 mm including the minimum value and the maximum value. .
Thus, even if the maximum depth change amount dmax is set, the restored sound can be clearly recognized with respect to the gas emission sound.

In the above embodiment, the number of unit panels in each undulating curved surface 30 is changed by changing the axial length i of each unit panel 25 on the assumption that the number of undulating curved surfaces 30 is constant. However, the present invention is not limited to such a positive pressure can, and the number of wavy curved surfaces and unit panel panels are described. In short, the average value of the maximum depth change amount of each unit panel is 0.46 mm or more and 1.08 mm or less, or the maximum value of the maximum depth change amount of the unit panel is 0. The present invention can be widely applied to all positive pressure cans set in a range of 59 mm or more and 1.31 mm or less.
In addition, regarding the unit panels constituting the polyhedral wall, in the first and second embodiments, the case where the boundary ridge line has a waveform shape has been described. However, not only the waveform shape but also a zigzag shape, a rectangular wave shape, can do.

Next, a third invention group of the present invention will be described in detail based on the illustrated embodiment.
[Embodiment 1 of Third Invention Group]
FIGS. 15A and 15B show a positive pressure can according to Embodiment 1 of the third invention group. FIG. 15A shows an internal pressure acting state, and FIG. 15B shows an internal pressure released state.
The positive pressure can 1 includes a bottomed cylindrical can body 2 having a can body 21 and a can lid 3 that seals the can body 2 in a positive pressure state, and a polyhedral wall 4 is provided on at least a part of the can body 21. Have. The can body 2 includes a cylindrical can body 21 extending straight, a neck portion 22 with a reduced diameter at the upper end of the can body 21, and a bottom portion 23, and a can lid 3 at the mouth of the upper end of the neck portion 22. Is tightened.
The positive pressure can 1 is a squeezed iron can made of aluminum alloy, and generally has a capacity of 160 to 500 ml, a can internal pressure of 20 to 300 [kPa] at 5 ° C., and a plate thickness of the can body 21 of 0.075. It is used in the range of 0.135 [mm], can body diameter 50-70 [mm], and can height 90-170 [mm].

The polyhedron wall 4 is formed into a concavo-convex shape by a folding structure without changing the circumference of the can body 21, and is composed of a large number of unit panels 5 partitioned by folds of oblique ridge lines 51. That is, a predetermined number of unit panels 5 are arranged in a direction parallel to the central axis N of the can body 21 (hereinafter simply referred to as an axial direction) to form a panel row 50, and the panel row 50 is arranged in the circumferential direction of the can body 21. The configuration is arranged all around. The phase in the axial direction of the unit panels 5 of the panel rows 50 adjacent to each other is shifted by half the axial length of the unit panels 5 and the unit panels 5 are densely arranged in the axial direction and the circumferential direction. .
In this example, the polyhedral wall 4 is provided in a strip shape in the middle of the axial direction of the can body 21, and the upper and lower regions of the polyhedral wall 4 are cylindrical surfaces having no irregularities. Although the area of the polyhedral wall 4 is about 50% with respect to the can body in the illustrated example, it is preferable to set it to 75% or less of the can body in consideration of the restored sound.

FIG. 15C is an enlarged view of a portion C in FIG.
In a free state where the internal pressure does not act, the unit panel 5 bends in a dogleg shape toward the inside of the can with a valley fold horizontal ridge line 52 positioned on a plane orthogonal to the central axis N of the can body 21 as a boundary. It is so depressed. Since the adjacent panel rows 50 are displaced in the axial direction by half the length of the unit panel 5, the unit panels 5 of the panel rows 50 located every other circumferential direction are in the same phase in the axial direction, The horizontal ridge line 52 is connected via a common vertex 53. Therefore, the cross section cut in the direction orthogonal to the central axis N of the can body 21 at the position of the horizontal ridgeline 52 of the unit panel 5 is a regular polygon as shown in FIG. In the illustrated example, it is a 14-sided shape, but it is not limited to a 14-sided shape. The corners of the vertex 53 are chamfered. In addition, the horizontal ridge line 52 is described as a straight line in the illustrated example, but in an internal pressure release state and an empty can state, about ± 0.5 mm, a convex arc shape inward of the can, or convex outward of the can It may be a curved shape such as an arc shape.
In the internal pressure acting state, each unit panel 5 is caused to have an arc shape in which the horizontal ridge line 52 follows the cylindrical surface of the can body as shown by a two-dot chain line in FIG. 15C due to the internal pressure acting on the can body 21. Deform. The oblique ridge line 51 is also deformed so as to follow the cylindrical surface of the can body 21, but is simply illustrated as a straight line in FIG.
Then, when the tab 6 of the can lid 3 is opened to open the gas, an internal gas is released from the opening portion to generate a gas emission sound, and the oblique ridge line 51 and the horizontal ridge line 52 of each unit panel 5 are instantaneously formed into a linear shape. As a result, the concavo-convex shape appears and a restored sound is generated by the impact.
Various factors such as the shape, area, and plate thickness of the unit panel 5 can be considered as factors for determining the size of the restored sound. However, as a result of intensive studies, the present inventors have determined the depth of the shape of the unit panel 5. It was found that there is a correlation with the maximum depth change, which is the change.

Hereinafter, the maximum depth change amount of the unit panel 5 will be described with reference to FIG.
16A is a front view of the unit panel 5, FIG. 16B is a sectional view taken along the line BB in FIG. 16A, and FIG. 16C is a sectional view taken along the line CC in FIG. In FIGS. 16B and 16C, the broken line indicates the internal pressure acting state, and the solid line indicates the restored state when the internal pressure is released.
The panel depth of the unit panel 5 in the first embodiment is a distance in a direction orthogonal to the central axis N of the can body 21 from the line connecting the vertex 53a and the vertex 53c to the midpoint m of the horizontal ridge line 52. The change amount dmax is the change amount of the panel depth in the internal pressure acting state and the internal pressure release state.
As shown in FIG. 16A, the unit panel 5 has a rhombus shape defined by four oblique ridge lines 51, and vibrates like a drum having the four oblique ridge lines 51 as a frame. The restoration sound appears.
This unit panel 5 includes a total of four vertices 53a and 53c positioned on a central plane M passing through the central axis N of the can body 21 and two vertices 53b and 53d positioned symmetrically with respect to the central plane M. Has two vertices. These four vertices 53a to 53d are located on a virtual cylindrical surface Y (indicated by a two-dot chain line in FIG. 16B) that substantially coincides with the cylindrical surface constituting the can body 21, and a free state in which no internal pressure is applied. Then, as shown by the solid line in FIG. 16 (B), the valley fold horizontal ridgeline 52 connecting the vertices 53b and 53d located at symmetrical positions with respect to the center plane M is connected inwardly to the can body 21 in the axial direction. It is the structure which bent and bent in the shape of a.
In the internal pressure acting state, as shown by a broken line in FIG. 16B, the upper triangular portion 5A and the lower triangular portion 5B are deformed so as to extend in the axial direction, and the middle point m of the horizontal ridge line 52 is the upper and lower apexes. It is displaced to a position close to the line connecting 53a and 53c. When viewed in a cross section, as shown by a broken line in FIG.
On the other hand, when the internal pressure is released, as indicated by a solid line in FIG. 16B, the unit panel 5 is restored to the shape of a dogleg and the midpoint m of the horizontal ridge line 52 returns to the deepest part. When viewed in a cross section, as shown in FIG. 16 (C), the shape is restored from a broken arc shape to a solid straight line shape. The midpoint m is the portion where the unit panel 5 is most displaced, and the change in the panel depth at the midpoint m is the maximum depth change dmax, and the maximum value of the maximum depth change dmax of the unit panel is 0.54 mm or less. It is comprised so that.

From the measurement result of the evaluation test described later (FIG. 20), by setting the maximum value of the maximum depth change amount dmax to 0.54 mm or less, the restored sound that can be heard after the gas emission sound is a sound that does not bother the gas emission sound. Can be reduced to the level of. The sound pressure level can be set to a range smaller than 75 dB and further about 70 dB or less at a position 40 cm away from the can body 21. Further, in the case of evaluating with the average value of the maximum depth change amount dmax of the unit panel, the unit panel whose maximum depth change amount dmax is 0.4 mm or more from the measurement results of the evaluation test described later (FIGS. 21 and 22). The average value of the maximum depth change amount dmax is set to 0.45 mm or less.
When there is no unit panel in which the maximum depth change amount dmax is 0.4 mm or more, the average value of the maximum depth change amount dmax is less than 0.4 mm. In particular, if the average value of the maximum depth change amount dmax is less than 0.4 mm and 0.15 mm or more, sound can be heard, but it becomes small enough not to bother.
Furthermore, if the average value of the maximum depth change amount of the unit panel is less than 0.15 mm, it is possible to achieve a level at which it cannot be heard completely.

[Relationship between number of corners of polyhedral wall 4 and maximum depth change dmax]
The maximum depth change amount dmax tends to be smaller as the unit panel 5 is smaller. If the body diameter of the can body 21 is the same, the size of the unit panel 5 is geometrically determined by the number of corners of the cross section shown in FIG. 15C, and the maximum depth change amount dmax increases as the number of corners increases. Becomes smaller. Conversely, the smaller the number of corners, the larger the unit panel 5 becomes, and the easier it is to deform, and the maximum depth change amount dmax increases. For example, when the can barrel diameter is in the range of 50 to 70 mm, it is preferable to set the corner from 14 to 16 corners. If the cross-sectional angle is larger than 16, the panel molding becomes difficult when the can body diameter D is in the range of 50 to 70 mm. If the angle is set from about 14 to 16 corners, the maximum value of the maximum depth change amount dmax is 0.54 mm or less, or the average value of the maximum depth change amount dmax of the unit panel having the maximum depth change amount dmax of 0.4 mm or more is It can be configured to be 0.45 mm or less. If the angle is about 16 corners, the average value of the maximum depth change amount dmax can be set to about 0.15 mm so as to be less than 0.15 mm or more than 0.15 mm.
Even if the length of the horizontal ridge line 52 is determined geometrically, the panel area varies depending on the vertical dimension. Therefore, it is preferable to set the angle from 14 to 16 corners to 80 mm ² or more and 120 mm ² or less. is there. If it is smaller than 80 mm ² , it becomes difficult to form a panel, and if it is larger than 120 mm ² , the maximum depth change amount becomes large and the restored sound becomes large.
Here, the area of the unit panel 5 is an area in a flatly developed state, that is, an area obtained by adding up the areas of the upper triangular portion 5A and the lower triangular portion 5B of the unit panel 5.

[Adjustment of maximum depth change amount dmax]
The maximum depth change amount dmax can be adjusted, for example, by adjusting the panel depth when empty. The panel depth at the time of empty can can be adjusted by curving the horizontal ridge line 52 in an arc shape inside or outside the can. That is, if the arc is curved inside the can, the maximum depth change amount dmax increases, and if the arc is curved outside the can, the maximum depth change amount dmax decreases.

[Embodiment 2]
Next, Embodiment 2 of the present invention will be described with reference to FIGS. 17 and 18. In the following description, only different points from the above embodiment will be described, and the same portions are denoted by the same reference numerals and description thereof is omitted.
FIG. 17 shows a positive pressure can according to the second embodiment. As in FIG. 15, FIG. 17 (A) shows an internal pressure acting state, and FIG. 17 (B) shows an internal pressure released state.
In the first embodiment, the unit panel 5 is configured by a panel that is recessed in a fold shape of the straight horizontal ridgeline 52, but in the second embodiment, the central axis of the can body 21 of the unit panel 25 The cross-sectional shape in the direction parallel to N is a panel configuration that is recessed in an arc shape.

The polyhedral wall 24 is formed with a plurality of corrugated curved surfaces 30 in which crests 26 and troughs 27 are alternately formed in the axial direction. As shown in FIGS. 15C and 15D, the wavy curved surface 30 is partitioned by waveform ridges 251 and 252 that are symmetrical with respect to the center plane M passing through the center axis N of the can body 21. A narrow part between the ridge lines 251 and 252 is a peak part 26 of the undulating curved surface 30, and a wide part is a valley part 27. The unit panel 25 is a region from the top part 26a of one peak part 26 of the undulating curved surface 30 to the top part 26a of the next peak part 26 through the valley part 27. The top part 26a of the peak part 26 allows the upper and lower unit panels 25 to be It is divided. That is, in the second embodiment, the entire circumference of the unit panel 25 is not demarcated by the corrugated ridge lines 251 and 252, but a part of the unit panel 25 is open and is divided by the top portion 26 a of the peak portion 26. Yes. In this example, although it is divided by the peak part 26, the part with the narrow space | interval of the waveform ridge lines 251 and 252 may contact, and in that case, the perimeter is divided by the boundary ridgeline.
The phase in the axial direction of the unit panels 25 of the corrugated curved surfaces 30 and 30 that are adjacent to each other is shifted by half the axial length of the unit panels, and the unit panels 25 are densely arranged in the axial direction and the circumferential direction.

The cross section of the corrugated curved surface 30 in the direction orthogonal to the central axis N of the can body 21 is linear at any position, for example, a cross section cut in the direction orthogonal to the central axis N of the can body 21 at the position of the top portion 26a of the peak portion 26. As shown in FIG. 17E, the apex portion 26a of the peak portion 26 is narrow and the unit panel 25 has a wide intermediate position. In the illustrated example, twelve unit panels 25 are formed across the mountain portion 26, but the number is not limited to twelve. Further, the cross section of the corrugated curved surface 30 in the direction orthogonal to the central axis N of the can body 21 has a circular cross section at the valley portion 27 on the inner side or the outer side of the can as will be described later in [Adjustment of Maximum Depth Change dmax]. It may be curved in an arc and is not limited to a straight line.
As shown in FIG. 17A, the polyhedral wall 4 is a cylindrical surface having no irregularities as a whole, as shown in FIG. When each unit panel 25 is viewed, it is deformed into an arc shape in the horizontal cross section, and the depression is eliminated. When the can lid 3 is opened, as shown in FIG. 17B, each unit panel 25 is restored to its original shape, and a restoration sound is emitted when the unit panel 25 is restored.
Also in the second embodiment, the restored sound has a correlation with the maximum depth change amount of the unit panel 25 as in the first embodiment.

Hereinafter, the maximum depth change amount dmax of the unit panel 25 will be described with reference to FIG.
18A is a front view of the unit panel 25, FIG. 18B is a sectional view taken along the line BB in FIG. 18A, and FIG. 18C is a sectional view taken along the line CC in FIG. As in FIG. 16, in FIGS. 18B and 18C, the broken line indicates the internal pressure acting state, and the solid line indicates the restored state when the internal pressure is released.
The panel depth of the unit panel 5 in the second embodiment is a distance in a direction orthogonal to the central axis N of the can body 21 from the line connecting the upper and lower two top portions 26a to the panel center m2, and the maximum depth change amount dmax. Is the amount of change in the panel depth in the internal pressure acting state and the internal pressure released state.
As shown in FIG. 18A, the unit panel 5 is a pair that does not cross each other in the region from the top 26a of one peak 26 of the undulating curved surface 30 to the top 26a of the next peak 26 through the valley 27. Are divided by waveform ridge lines 251 and 252.
The corrugated ridge lines 251 and 252 are formed by alternately and repeatedly forming concave arc ridge lines 251b and 252b and convex arc ridge lines 251a and 252a in the axial direction. The convex arc ridge lines 251a and 252a are symmetrically opposed to each other. In the region of the valley portion 27, the concave arc ridge lines 251b and 252b are opposed to each other in a barrel shape, and the upper and lower peak portions 26 are opposed to the apexes a1 and a2 of the convex arc ridge lines 251a and 252a and gradually narrow. It becomes the shape that becomes.
The vertices a1 and a2 of the convex arc ridge lines 251a and 252a are located at the top part 26a of the peak part 26 of the corrugated curved surface 30, and there is no ridge line that becomes a crease on the top and bottom of the unit panel 25. It is divided. Further, the positions of the vertices b1 and b2 that are the maximum widths of the concave arc ridge lines 251b and 252b are located at the tops 26a of the peak portions 26 of the adjacent unit panels 25, and the concave arc ridge lines 251b and 252b of the unit panel 25 are located. The vertices b1 and b2 and the vertices a1 and a2 of the convex arc ridge lines 251a and 252a are located on one virtual cylindrical surface that substantially coincides with the cylindrical surface of the can body 21.
The panel center m2 of the unit panel 25 is an intersection with the virtual horizontal line X on the center plane M and connecting the vertices b1 and b2 of the concave arc ridge lines 251b and 252b having the maximum width. This is the deepest portion of the valley portion 27 of the curved surface 30 from the virtual cylindrical surface. The panel center m2 is also an intermediate position between the top portions 26a and 26a of the upper and lower mountain portions 26.

As shown by the solid line in FIG. 18B, the panel center m2 has a shape that is recessed in an arc toward the inside of the can body 21. In the internal pressure acting state, as indicated by a broken line in FIG. 18B, the unit panel 25 that is recessed in an arc shape is deformed so as to extend in parallel with the central axis N of the can body 21, and the panel center m2 is It is displaced to a position close to the line connecting the top portions 26a, 26a of the peak portion 26. When viewed in a cross section, as shown by a broken line in FIG.
On the other hand, when the internal pressure is released, as indicated by a solid line in FIG. 18B, the unit panel 5 is restored to an arc shape, and the panel center m2 returns to the deepest part. When viewed in a cross section, as shown in FIG. 18C, the arc shape of a broken line is restored to a solid straight line shape.
The panel center m2 is the portion of the unit panel 25 that is most displaced, and the panel depth change amount in the panel center m2 internal pressure applied state and the internal pressure release state is the maximum depth change amount dmax, and the maximum depth change amount dmax. If the maximum value is set to 0.54 mm or less, the restored sound can be made sufficiently lower in volume than the gas emission sound. In the case of an arc-shaped panel, since there are few unit panels that are not restored, if the average value of the maximum depth change amount is reduced to less than 0.4 mm and at least 0.15 mm or less, the volume is sufficiently low.

[Adjustment of maximum depth change amount dmax]
In the second embodiment, as in the first embodiment, the maximum depth change amount dmax can be adjusted, for example, by adjusting the panel depth when empty. Although the cross section of the corrugated curved surface 30 in the direction orthogonal to the central axis N of the can body 21 is linear at any position, the can is curved by curving the cross section at the valley portion 27 inside or outside the can. The panel depth can be adjusted. That is, if the arc is curved inside the can, the maximum depth change dmax is increased, and if the arc is curved outside the can, the maximum depth change dmax is decreased. When the cross section is curved to the inside of the can, the panel center m2 in the internal pressure acting state may be displaced to a position outside the line connecting the two upper and lower apexes 26a.

[Evaluation test]
Hereinafter, the evaluation test of the restored sound will be described. In the evaluation test, the following sample having a rhombus unit panel was prepared. Samples 1 to 6 are comparative examples, and sample 7 is a sample of the present invention. Further, as the sample 8, a sample in which the unit panel having the same form as that of the second embodiment has an arc shape was prepared. (Sample 1) Number of corners: 13 corners, number of panels: 91, empty can depth: 0.81 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 2) Number of corners: 13 corners, number of panels: 91, empty can depth: 0.85 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 3) Number of corners: 13 corners, number of panels: 91, empty can depth: 0.89 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 4) Number of corners: 13 corners, number of panels: 91, empty can depth: 0.92 mm, unit panel area: 126 mm ² , polyhedral wall area: 68% of can body
(Sample 5) Number of corners: 11 corners, number of panels: 66, empty can depth: 1.38 mm, unit panel area: 177 mm ² , polyhedral wall area: 70% of can body
(Sample 6) Number of corners: 11 corners, number of panels: 66, empty can depth: 1.45 mm, unit panel area: 177 mm ² , polyhedral wall area: 70% of can body
(Sample 7) Number of corners: 16 squares, number of panels: 144, empty can depth: 0.83 mm, unit panel area: 83 mm 2, polyhedral wall area: 70% of can body (sample 8) number of corrugated surfaces: 26 Unit panel area: 109 mm ² , polyhedral wall area: 70% of can body, panel depth adjusted so that maximum depth change is large. The number of corrugated surfaces is also counted as one surface whose height is half-phase shifted.
(Test conditions)
The conditions of the evaluation test are as follows.
・ Temperature: 5 ℃ storage (Liquid temperature is 6.5-8 ℃),
・ Can internal pressure: 120-150kPa
・ Thickness of can body 0.092 ~ 0.122mm
・ Can barrel diameter: 66.5-67mm
・ Can height: 121.8-122.2mm
・ Contents: 350ml
(Test method)
The maximum depth change amount dmax is obtained by measuring the panel depth when the internal pressure is applied, then measuring the panel depth when the internal pressure is released, and measuring the difference. As shown in FIG. 19A, the panel depth measurement method is such that the bottom side of the positive pressure can 1 is held horizontally by a vacuum, and the digimatic indicator 100 (“Digimatic” is a registered trademark of “Mitutoyo Co., Ltd.”). ) Is vertically applied to the apex 53 so that its height is zero, the positive pressure can 1 is slid in the direction of the central axis N, and the digimatic indicator 100 is moved to the middle point m of the horizontal ridge 53. In addition, the height is obtained by placing the probe 101 on the middle point m of the horizontal ridge line 53.
Digimatic indicator 100 is supported by support arm 103 that is fixed to stand 102 that is erected vertically on a horizontal base, and the posture is held vertically. On the other hand, a horizontal movement mechanism 104 that holds the positive pressure can 1 and moves it horizontally along the central axis N of the positive pressure can 1 is provided below the digimatic indicator 100 of the stand 102. The horizontal movement mechanism 104 includes a holding portion 105 that holds the mouth portion of the positive pressure can 1 and a telescopic portion 106 such as a cylinder mechanism or a feed screw mechanism that moves the holding portion 105 horizontally. The panel depth is obtained for all the unit panels 5, and the difference between the panel depths in the internal pressure applied state and the internal pressure release state of each unit panel 5 is defined as the maximum depth change amount dmax, the maximum value, and the maximum depth change amount of each unit panel. The average value of dmax was calculated. The average value is the average value of the maximum depth change amount for the unit panels excluding the unit panel whose maximum depth change amount dmax is less than 0.4 mm, and the unit excluding the unit panel whose maximum depth change amount dmax is less than 0.3 mm. The average value of the maximum depth change amount for the panel and the average value obtained for all the unit panels without excluding the unit panel are calculated based on the dimension of the maximum depth change amount dmax. Each sample has three cans, and regarding the maximum value of the maximum depth change amount, the average value of the three maximum cans is (ave), the maximum value is (max), and the minimum value is (min). In addition, regarding the average value of the maximum depth change amount dmax of each unit panel, the average value with respect to 3 cans of measurement is (ave), the maximum value is (max), and the minimum value is (min). Digimatic indicator manufactured by Mitutoyo Corporation, model number ID-C1012, and probe 101 used by Mitutoyo Corporation, model number 137413 were used.
On the other hand, as shown in FIG. 19B, the sound level of the restored sound was measured by installing a noise meter 120 at a position 40 cm away from the can. This 40 cm is a distance L between the microphone 121 and the positive pressure can 1. The meaning of 40 cm means the approximate distance between the can and the ear when actually opened. The sound level meter 120 was placed on the floor, and the microphone 121 was held at a height of about 60 cm from the floor by the stand 122. The measured value is obtained as time axis waveform data. When the positive pressure can 1 is opened, a tearing sound of the can lid due to the pull tab is generated first, and then the gas emission sound and the restoration sound are generated in this order. The level. The frequency weighting characteristic is A characteristic, and the time weighting characteristic is F. The number of measurements was 3 cans, and the average value (ave), maximum value (max), and minimum value (min) of the restored sound were determined.
As the sound level meter 120, model number NL-42 manufactured by Rion Co., Ltd. is used, and a wind screen WS-10 is attached to the tip of the microphone 121.

(Measurement results) The measurement results are as shown in Table 3.

20 and 21 are graphs of the data in Table 3.
FIG. 20 shows the relationship between the maximum value of the maximum depth change amount and the magnitude of the restored sound, and FIG. 21 shows the relationship between the average value of the maximum depth change amount and the magnitude of the restored sound. In each graph, samples 1 to 7 are shown as S1 to S7, respectively.
First, with reference to FIG. 20, the relationship between the maximum value of the maximum depth change amount and the volume of the restored sound will be described.
For the 11-corner sample 5 (S5) and sample 6 (S6) of the comparative example, the maximum value of the maximum depth change amount is in the range of 0.74 mm to 0.86 mm, and the restored sound is as large as 76 dB to 80 dB. . On the other hand, for sample 1 (S1) to sample 4 (S4) of 13 corners, the average value of the maximum depth change amount is in the range of 0.55 mm to 0.74 mm, and the restored sound is in the range of 72 dB to 79 dB. . For sample 8 (S8), the maximum value of the maximum depth change amount is 1.00 mm, and the restored sound is 83 dB.
On the other hand, for sample 7 (S7) according to the present invention, the maximum value of the maximum depth change is in the range of 0.22 mm to 0.31 mm, and is in the range of 43 dB to 46 dB, which is almost inaudible. .
In FIG. 20, the points of the maximum depth change amount and the average value of the restored sound of the 11-corner samples 5 (S5) and 6 (S6) are g1, the 13-corner samples 1 (S1) to 4 (S4) When the point of the depth change amount and the average value of the restored sound is g2, and the straight line passing through g1 and g2 and the sample 8 is G1, 13 corners of the 11 corner samples 5 (S5) and 6 (S6). Sample 1 (S1) to Sample 4 (S4) have a smaller maximum depth change amount and a smaller restored sound.
Further, assuming that the average value of the maximum depth change amount for sample 7 (S7) is g3, and the straight line passing through the average point g2 of the 13 corner samples 1 (S1) to 4 (S4) is G2, On the other hand, the maximum depth change amount is further reduced toward the 16th corner, and the restored sound is greatly reduced. The gradient of this straight line G2 is larger than the gradient of G1.
If the straight line G1 reaches 0.55 mm, which is the minimum value of the maximum depth change amount of the 13 corner samples 1 (S1) to 4 (S4), it falls below 75 dB, and at 0.54 mm, it drops to about 73 dB. In the straight line G2, the 0.54 mm line falls below 70 dB of the gas emission sound and decreases to about 66 dB. Actually, the restoration sound decreases in the range closer to the straight line G2 than the straight line G1 as the maximum depth change amount decreases, and if the maximum value of the maximum depth change amount of the unit panel is 0.54 mm or less, It drops to the level before and after the sound emission. The sample 8 is an arc panel and is different from the samples 1 to 7, but the relationship between the maximum depth change amount and the restored sound is on the G1 line and behaves similarly according to the maximum depth change amount. Sample 8 has 26 corrugated surfaces and is similar to the 13-corner cross section of samples 1 to 4, but the maximum depth change and restored sound are large. When the maximum depth change amount is reduced, the number of corrugated surfaces is increased.

Next, with reference to FIG. 21 and FIG. 22, the relationship between the average value of the maximum depth change amount and the volume of the restored sound will be described.
As shown in FIG. 20, when the maximum value of the maximum depth change amount is used, there is a possibility that the variation becomes large. Therefore, it was considered to take an average value of the maximum depth change amount of the unit panel. However, if the average value of the maximum depth change amounts of all the unit panels is taken, as shown in FIG. 22A, sample 5 (S5) and sample 6 (S6) of the present invention are compared with sample (S1) of the comparative example. ) To Sample 4 (S4), and the opposite result is that the average value of the maximum change in depth is smaller. As a result of examining this result, it was found that not all unit panels were completely restored, and some unit panels were not fully restored. Therefore, the average value for the unit panel having the maximum depth change amount of 0.3 mm or more and the average value for the unit panel having the maximum depth change amount of 0.4 mm or more are calculated and graphed. 22 (B).
In the case where a unit panel of 0.3 mm or more is extracted, as shown in FIG. 22 (B), sample 5 (S5) and sample 6 (S6) are in a range where they intersect with sample 1 to sample 4, and are unclear. However, when a unit panel of 0.4 mm or more is extracted, as shown in FIG. 21, sample 5 (S5) and sample 6 (S6) escape from the range where sample 1 to sample 4 intersect, and sample 5 (S5) It was also found that the maximum depth change amount (average value) of Sample 6 (S6) was larger than the maximum depth change amount (average value) of Sample 1 to Sample 4, and was clearly divided.
Therefore, in calculating the average value of the maximum depth change amount of each can, the unit panel whose maximum depth change amount is less than 0.4 mm is excluded, and the influence of the unit panel that is not restored is excluded. In sample 7 (S7), all unit panels have been restored, taking the average value of the maximum depth change amount without restriction, and excluding samples 1 (S1) to 6 (S6) less than 0.4 mm Shall be handled in the same way.
As shown in FIG. 21, for the 11-corner samples 5 (S5) and 6 (S6) of the comparative example, the average value of the maximum depth change amount is in the range of 0.57 mm to 0.67 mm, and the restored sound is 76 dB. It is as large as ~ 80 dB. On the other hand, for the 13 corner samples 1 (S1) to 4 (S4), the average value of the maximum depth change amount is in the range of 0.48 mm to 0.53 mm, and the restored sound is in the range of 72 dB to 78 dB. .
For sample 7 (S7) according to the present invention, the average value of the maximum depth change amount is in the range of 0.17 mm to 0.20 mm, and is in the range of 43 dB to 46 dB, which is almost inaudible.
In FIG. 21, the maximum depth change amount and the average value of the restored sound of the 11 corner samples 5 (S5) and 6 (S6) are the maximum points of the 11th and 13th corner samples 1 (S1) to 4 (S4). If the point of the depth change amount and the average value of the restored sound is g12, and the straight line passing through g11 and g12 is G11, the sample 1 of 13 corners (sample 5 (S5) and sample 6 (S6)) In S1) to Sample 4 (S4), the maximum amount of change in depth is smaller, and the restored sound is also smaller.
Further, assuming that the average value of the maximum depth change amount for sample 7 (S7) is g13, and the straight line passing through the average point g12 of the 13 corner samples 1 (S1) to 4 (S4) is G12, On the other hand, the maximum depth change amount is further reduced toward the 16th corner, and the restored sound is greatly reduced. The gradient of this straight line G12 is larger than the gradient of G11.

In the straight line G12, the 0.45 mm line is reduced to the vicinity of 71 dB, which is the same level as the gas emission sound, and is in a range where the restoration sound is not anxious. The restoration sound is considered to decrease in a range closer to the straight line G12 than the straight line G11 as the maximum depth change amount decreases, and the average of the maximum depth change amount of the unit panel in which the maximum depth change amount is 0.4 mm or more. If the value is 0.45 mm or less, the value drops below 75 dB to a level close to the gas emission sound. The gas emission sound is about 70 dB, and if it is 72 dB or less, it becomes a level that does not matter. Preferably, it is set to 70 dB or less. On the other hand, the average value of the unit panel with a maximum depth change of 0.4 mm or more is set to 0.45 mm or more, and the maximum value of the maximum depth change is between 0.4 mm and 0.45 mm. Of course, the average value is less than 0.45 mm.
When there is no unit panel having a maximum depth change amount of 0.4 mm or more, the influence of the unit panel that is not restored is small, and the evaluation is made by the average value of the maximum depth change amounts of all the unit panels. Since the average value does not exceed 0.4 mm, the average value may be configured to be less than 0.4 mm.
Further, as shown in FIG. 21, when the average value of the maximum depth change amount reaches 0.15 mm, it becomes smaller than 40 dB, which is almost inaudible. Therefore, if the average value of the maximum depth change amount is set to be 0.15 mm or more and less than 0.4 mm, a sound can be heard, but the level can be reduced to a level that does not matter.
Further, if the average value of the maximum depth change amount of the unit panel is set to 0.15 mm or less, a level that cannot be completely heard can be obtained.
In the case of an arc-shaped unit panel, although there is only data of sample 8, if the average value of the maximum depth change is reduced to less than 0.4 mm and at least 0.15 mm or less, it is sufficient for the gas emission sound. The volume is low.
In terms of the number of cross-sectional angles, the average value of the maximum depth change amount is 0.45 mm or less if the angle is between 14 and 16 angles, or about 14, 15 and 16 angles.
The unit panel constituting the polyhedral wall is not limited to the bent rhombus shape of the first embodiment and the arc shape of the second embodiment. The present invention can be applied to various patterns that are deformed in a direction in which the dent is reduced by the acting internal pressure and are restored to the original shape when the can lid is opened.

1 positive pressure can,
2 can body 21 can body, 22 neck part, 23 bottom part,
3 Can lid 4 Polyhedral wall 5 Unit panel 5A Upper triangular portion, 5B Lower triangular portion 51 Diagonal ridge line, 52 Horizontal ridge line, 53 (53a to 53d) Vertex 50 Panel row 6: Tab 100 Digimatic indicator 120 Sound level meter M Center plane N Center axis dmax Maximum depth change m Middle point m2 of horizontal ridge line Panel center 24 Polyhedron wall 25 Unit panel 251 252 Waveform ridge line,
30 Corrugated curved surface 26 Mountain, 26a Top 27 Valley

Claims (33)

1. A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
   The positive pressure can characterized in that the maximum value of the maximum depth change amount of the unit panel is set to 0.75 mm or more and 1.2 mm or less.
2. A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
   The positive pressure can characterized in that the average value of the maximum depth change amount for the unit panel having a maximum depth change amount of 0.4 mm or more is set in a range of 0.54 mm or more and 0.75 mm or less.
3. A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
   The maximum value of the maximum depth change amount of the unit panel is set to 0.75 mm or more and 1.2 mm or less, and the average value of the maximum depth change amount for the unit panel whose maximum depth change amount is 0.4 mm or more is A positive pressure can characterized by being set in a range of 0.54 mm to 0.75 mm.
4. The positive pressure can according to any one of claims 1 to 3, wherein a sound pressure level of the restored sound is set to 75 dB or more at a position 40 cm away from the can body.
5. The positive pressure can according to any one of claims 1 to 4, wherein the polyhedral wall is 25% or more of an area of the can body.
6. The unit panel has a rhombus shape defined by oblique ridgelines as the boundary ridgelines, two vertices located on a central plane passing through the central axis of the can body, and two symmetric positions with respect to the central plane It has a total of four vertices, and is bent inwardly of the can body by a transverse ridge line of valley folds connecting vertices located symmetrically with respect to the center plane in a free state where no internal pressure is applied. It has a configuration
   The positive pressure can according to any one of claims 1 to 5, wherein the maximum depth change amount is a change amount of a unit panel depth at a midpoint of the horizontal ridge line.
7. The polyhedral wall has a configuration in which a plurality of unit panels arranged in a direction parallel to the central axis of the can body are densely arranged all around in the circumferential direction of the can body,
   The positive pressure can according to claim 6, wherein the number of corners of the cross section passing through the horizontal ridge line of the unit panel is set in a range of 11 to 12 corners.
8. The positive pressure can according to claim 7, wherein an area of the unit panel is set to 130 mm ² or more and 180 mm ² or less.
9. The positive pressure can according to any one of claims 1 to 8, wherein the maximum depth change amount is a maximum depth change amount when an internal pressure before opening is 20 to 300 kPa.
10. The positive pressure can according to claim 9, wherein the internal pressure before opening is 120 to 150 kPa.
11. In a positive pressure can comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state,
    Having a polyhedral wall composed of a large number of unit panels defined by at least part of the can body by convex boundary ridge lines;
    In a free state where no internal pressure is applied, the unit panel has a cross-sectional shape parallel to the central axis of the can body that is recessed in an arc shape inwardly of the can body, and the depression is small due to the internal pressure acting on the can body. It is deformed in the direction to be restored, restored to its original shape when the can lid is opened, and a restoration sound is emitted when restoring,
    The positive pressure can characterized in that the average value of the maximum depth change amount of each unit panel is set in a range of 0.46 mm or more and 1.08 mm or less.
12. In a positive pressure can comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state,
    Having a polyhedral wall composed of a large number of unit panels defined by at least part of the can body by convex boundary ridge lines;
    In a free state where no internal pressure is applied, the unit panel has a cross-sectional shape parallel to the central axis of the can body that is recessed in an arc shape inwardly of the can body, and the depression is small due to the internal pressure acting on the can body. It is deformed in the direction to be restored, restored to its original shape when the can lid is opened, and a restoration sound is emitted when restoring,
    The positive pressure can characterized in that the maximum value of the maximum depth change amount is set in a range of 0.59 mm or more and 1.31 mm or less.
13. The positive pressure can according to claim 11 or 12, wherein a sound pressure level of the restored sound is set to 75 dB or more at a position 40 cm away from the can body.
14. The positive pressure can according to any one of claims 11 to 13, wherein the polyhedral wall is 25% or more of an area of the can body.
15. The unit panel has a shape in which a cross-sectional shape perpendicular to the central axis of the can body passing through the center of the unit panel is recessed inward of the can body in a free state where no internal pressure is applied. The positive pressure can according to any one of claims 11 to 14.
16. The average value of the maximum depth change amount is related to the size of the unit panel, and the larger the unit panel size is, the larger the maximum depth change amount is. 16. The positive pressure can according to claim 11, wherein a relationship between the number of the panels and the number of the unit panels is smaller as the size of the unit panel is larger.
17. The positive pressure can according to any one of claims 11 to 16, wherein the number of the unit panels is set to 65 or more and 117 or less.
18. The polyhedral wall in a free state has a plurality of undulating curved surfaces in the circumferential direction in which peaks and valleys are alternately formed in the axial direction, and the undulating curved surface is in relation to a central plane passing through the central axis of the can body The boundary ridge lines that form the symmetrical boundary ridge lines are partitioned, a narrow portion of the gap between the waveform ridge lines is a peak portion of a corrugated curved surface, a wide interval portion is a valley portion, the unit panel is The region of the corrugated curved surface is a region from the top of one peak to the top of the next peak through the valley, and the upper and lower unit panels are divided by the top of the peak. The positive pressure can of any one of Claims.
19. The positive pressure can according to any one of claims 11 to 18, wherein the maximum depth change amount is a maximum depth change amount when an internal pressure before opening is 20 to 300 kPa.
20. The positive pressure can according to claim 19, wherein the internal pressure before opening is 120 to 150 kPa.
21. A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
    The positive pressure can characterized in that the maximum value of the maximum depth change amount of the unit panel is 0.54 mm or less.
22. A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
    A positive pressure can characterized in that an average value of a maximum depth change amount for a unit panel in which a maximum depth change amount of the unit panel is 0.4 mm or more is 0.45 mm or less.
23. A polyhedron comprising a can body having a can body and a can lid for sealing the can body in a positive pressure state, and comprising a large number of unit panels defined by convex boundary ridges at least at a part of the can body The unit panel has a shape that is recessed inward of the can body in a free state, and is deformed in a direction in which the recess is reduced by an internal pressure acting on the can body, and returns to its original shape when the can lid is opened. In a positive pressure can that is restored and emits a restoration sound when restored,
    The unit panel has a maximum depth change amount of less than 0.4 mm, and the unit panel has a maximum depth change amount of less than 0.4 mm. A positive pressure can.
24. The positive pressure can according to claim 23, wherein an average value of a maximum depth change amount of the unit panel is 0.15 mm or more and less than 0.4 mm.
25. 24. The positive pressure can according to claim 23, wherein an average value of a maximum depth change amount of the unit panel is less than 0.15 mm.
26. The positive pressure can according to any one of claims 21 to 25, wherein a sound pressure level of the restored sound when the positive pressure can is opened is set to 72 dB or less at a position 40 cm away from the can body.
27. The positive pressure can according to any one of claims 21 to 26, wherein the polyhedral wall is 75% or less of an area of the can body.
28. The unit panel has a rhombus shape defined by oblique ridgelines as the boundary ridgelines, two vertices located on a central plane passing through the central axis of the can body, and two symmetric positions with respect to the central plane It has a total of four vertices, and is bent inwardly of the can body by a transverse ridge line of valley folds connecting vertices located symmetrically with respect to the center plane in a free state where no internal pressure is applied. The positive pressure can according to any one of claims 21 to 27, wherein the maximum depth change amount is a change amount of a unit panel depth at a midpoint of the horizontal ridge line.
29. The polyhedral wall has a configuration in which a plurality of the unit panels are arranged in a direction parallel to the central axis of the can body, and the unit panel row is densely arranged in the circumferential direction of the can body. 29. The positive pressure can according to claim 28, wherein the number of corners of the cross section passing through the horizontal ridge line is set in a range of 14 to 16 corners.
30. 30. The positive pressure can according to claim 29, wherein an area of the unit panel is set to 80 mm ² or more and 120 mm ² or less.
31. The positive pressure can according to any one of claims 21 to 27, wherein the unit panel has a shape in which a cross-sectional shape in a direction parallel to a central axis of the can body is recessed in an arc shape.
32. The positive pressure can according to any one of claims 21 to 31, wherein the maximum depth change amount is a maximum depth change amount when the internal pressure before opening is 20 to 300 kPa.
33. The positive pressure can according to claim 32, wherein the internal pressure before opening is 120 to 150 kPa.

Images