JP2019189268A - Bottle - Google Patents

Abstract

To provide a bottle, in which buckling strength of a trunk part is improved.SOLUTION: In a cylindrical bottle 1 with a bottom formed of synthetic resin materials, an annular groove 15 continuously extended over the whole circumference and a pair of auxiliary annular grooves 25 and 26 continuously extended over the whole circumference and arranged respectively at both sides sandwiching the annular groove 15 in a vertical direction are formed in a trunk part 13, where depths of the auxiliary annular grooves 25 and 26 are shallower than a depth of the annular groove 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bottle.

  Conventionally, as a bottle formed of a synthetic resin material into a bottomed cylindrical shape, for example, as shown in Patent Document 1 below, by forming an annular groove continuously extending over the entire circumference in the body portion, a lateral load is formed. The structure which improved the rigidity of the trunk | drum with respect to is known.

JP 2017-109785 A

  However, in the conventional bottle, when a large compressive load is applied in the vertical direction, the body portion expands in one direction of the radial direction and contracts in the other direction orthogonal to the one direction. There is a risk of deforming unrecoverable, that is, buckling deformation. This problem becomes apparent when the weight is reduced.

  Then, an object of this invention is to provide the bottle which can improve the buckling strength of a trunk | drum.

  The present invention employs the following means in order to solve the above problems. That is, the bottle of the present invention is a bottomed cylindrical bottle formed of a synthetic resin material, and the trunk portion has an annular groove extending continuously over the entire circumference, and continuously extending over the entire circumference. A pair of auxiliary annular grooves disposed separately on both sides sandwiching the annular groove in the vertical direction are formed, and the depth of the auxiliary annular groove is shallower than the depth of the annular groove.

In the present invention, the body portion is formed with a pair of auxiliary annular grooves arranged on both sides sandwiching the annular groove in the vertical direction, so that the rigidity against the lateral load can be improved reliably, When a large compressive load is applied in a direction, the body portion is irreversibly deformed so that it expands in one direction of the radial direction and contracts in another direction orthogonal to the one direction. In the trunk portion, the portion located between the annular groove and the auxiliary annular groove acts as a rib, and buckling deformation of the trunk portion can be suppressed.
In addition, the depth of the auxiliary annular groove is shallower than the depth of the annular groove, so that when the large compressive load is applied in the vertical direction, the deformation of the body portion is suppressed so that the auxiliary annular groove is crushed in the vertical direction. It becomes possible to improve the buckling strength of the trunk part.

Here, the width of the bottom surface of the auxiliary annular groove may be narrower than the width of the annular groove.
In this case, since the width of the bottom surface of the auxiliary annular groove is narrower than the width of the annular groove, the trunk portion is deformed so that the auxiliary annular groove is crushed in the vertical direction when a large compressive load is applied in the vertical direction. Can be reliably suppressed.

  Further, in the body portion, each portion located between the annular groove and the pair of auxiliary annular grooves is formed in a curved surface shape protruding outward in the radial direction, and the annular groove and the auxiliary groove are formed. It may be connected to the annular groove without any step.

  In this case, in the body portion, each portion located between the annular groove and the pair of auxiliary annular grooves is formed in a curved surface shape protruding outward in the radial direction, and a step is formed between the annular groove and the auxiliary annular groove. Therefore, when a large compressive load is applied in the vertical direction, it is possible to reliably suppress the body portion from buckling and to improve the rigidity against the lateral load.

  According to this invention, the buckling strength of the trunk portion can be improved.

It is a side view of the bottle shown as one embodiment concerning the present invention. It is a semi-longitudinal sectional view of the bottom part of the bottle shown in FIG. It is a part of AA arrow directional cross-sectional view shown in FIG.

Hereinafter, a bottle according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the bottle 1 according to this embodiment includes a mouth portion 11, a shoulder portion 12, a trunk portion 13, and a bottom portion 14, and these 11 to 14 have their respective central axes as a common axis. It is a schematic configuration that is arranged in this order in a state of being positioned above. The internal volume of the bottle 1 is a size that can be filled with, for example, 300 ml or more and 2000 ml or less. In the illustrated example, the bottle 1 is sized to be filled with 500 ml of contents.

Hereinafter, the common axis is referred to as the bottle axis O, the mouth 11 side along the bottle axis O direction is referred to as the upper side, the bottom 14 side is referred to as the lower side, the direction along the bottle axis O is referred to as the vertical direction, A direction intersecting with the bottle axis O when viewed from the direction is referred to as a radial direction, and a direction around the bottle axis O is referred to as a circumferential direction.
The bottle 1 is formed by blow-molding a preform formed into a bottomed cylinder by injection molding, and is integrally formed of a synthetic resin material. A cap (not shown) is attached to the mouth portion 11. Each of the mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 has a circular cross-sectional shape orthogonal to the bottle axis O.

  A plurality of rectangular panel portions 13 a that are long in the vertical direction are formed in the body portion 13 at intervals in the circumferential direction. In the trunk portion 13, an annular groove 15 extending continuously over the entire circumference is formed at the lower end portion located below the panel portion 13 a. The annular groove 15 is formed in a concave curved surface shape that is recessed toward the inside in the radial direction. In addition, you may form the annular groove 15 in parts other than a lower end part among the trunk | drums 13. FIG. The outer diameter of the lower end part of the trunk | drum 13 is 55 mm or more and 110 mm or less, for example. In the illustrated example, the outer diameter of the lower end portion of the body portion 13 is about 71 mm.

  The bottom portion 14 includes a bottom wall portion 19 where the ground contact portion 18 is located on the outer peripheral edge portion, and a cylindrical heel portion 17 extending upward from the outer peripheral edge of the ground contact portion 18. The heel portion 17 is formed in a curved shape that protrudes outward in the radial direction. An upper end opening edge of the heel portion 17 is connected to a lower end opening edge of the body portion 13. The lower end opening edge of the heel portion 17 is connected to the outer peripheral edge of the bottom wall portion 19, that is, the outer peripheral edge of the grounding portion 18. In the bottom wall portion 19, a portion located on the inner side in the radial direction from the ground contact portion 18 is a depressed portion 16 that is recessed upward. Note that the bottom wall portion 19 may not have the depression 16.

The heel portion 17 is configured by alternately arranging first portions 21 and second portions 22 having a radius of curvature smaller than the first portion 21 in a longitudinal sectional view along the vertical direction. In the illustrated example, twelve second portions 22 are arranged. The portion located between the upper end and the lower end of the second portion 22 is located on the outer side in the radial direction from the portion located between the upper end and the lower end of the first portion 21.
Note that the number of the second portions 22 may be changed as appropriate, and the portion located between the upper end and the lower end of the second portion 22 is the portion located between the upper end and the lower end of the first portion 21. It may be located more inside in the radial direction.

  The curvature radius of the second portion 22 in the longitudinal sectional view is, for example, 0.65 times or more and less than 0.88 times the curvature radius of the first portion 21 in the longitudinal sectional view. If it is less than 0.65 times, the moldability may be inferior, for example, an air pocket is likely to be generated, and if it is 0.88 or more, the second portion 22 is difficult to exert a reinforcing effect. In the illustrated example, for example, the radius of curvature of the first portion 21 in the longitudinal sectional view is about 4.5 mm, and the radius of curvature of the second portion 22 in the longitudinal sectional view is about 3.5 mm. The circumferential width of the first portion 21 is wider than the circumferential width of the second portion 22. In the illustrated example, the circumferential width of the first portion 21 is about 9.8 mm.

  The heel portion 17 includes a third portion 23 that connects the first portion 21 and the second portion 22. The third portion 23 gradually extends inward in the radial direction from the second portion 22 side toward the first portion 21 side, and has a larger radius of curvature in the longitudinal sectional view. The radius of curvature of the first portion 21 in the longitudinal sectional view is the same over the entire circumference. The third portion 23 continues to the second portion 22 and the first portion 21 without a step.

  In a cross-sectional view orthogonal to the container axis O, the first portion 21 and the second portion 22 have a curved shape that protrudes outward in the radial direction, and the portion of the third portion 23 that is continuous with the first portion 21. Exhibits a curved shape that is recessed toward the inside in the radial direction, and a portion that continues to the second portion 22 has a curved shape that protrudes toward the outside in the radial direction. In the cross-sectional view, the radius of curvature of the first portion 21 is larger than the radius of curvature of the portion of the third portion 23 that continues to the first portion 21 and the portion that continues to the second portion 22. In the cross sectional view, the radii of curvature of the third portion 23 that are continuous with the first portion 21 and the portion that is continuous with the second portion 22 are equal to each other.

  The second portion 22 is a top portion located at the center portion of the curved surface portion in the circumferential direction when the entire pair of third portions 23 adjacent to each other in the circumferential direction is viewed as one curved surface portion. That is, the second portion 22 is a linear portion extending in the vertical direction. The total circumferential width of a pair of third portions 23 adjacent to each other with the second portion 22 sandwiched in the circumferential direction is narrower than the circumferential width of the first portion 21. In the illustrated example, the total circumferential width of the pair of third portions 23 is about 8.8 mm.

In addition, the 2nd part 22 may have a width | variety not only in the said linear part but in the circumferential direction. In this case, the circumferential width of the first portion 21 may be twice or more the circumferential width of the second portion 22. When the circumferential width of the second portion 22 is less than half the circumferential width of the first portion 21, the second portion 22 is less likely to exert a reinforcing effect.
Further, the total circumferential width of the pair of third portions 23 adjacent to each other with the second portion 22 sandwiched in the circumferential direction may be equal to or greater than the circumferential width of the first portion 21.

In the present embodiment, the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are formed in the body portion 13 continuously extending over the entire circumference and separately disposed on both sides of the annular groove 15 in the vertical direction. Has been.
The depths of the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are equal to each other and are shallower than the depth of the annular groove 15. The widths of the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are equal to each other and are narrower than the width of the annular groove 15.

  The upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 connect the upper wall surfaces 25a and 26a located on the upper side, the lower wall surfaces 25b and 26b located on the lower side, and the upper wall surfaces 25a and 26a and the lower wall surfaces 25b and 26b, respectively. The groove bottom surfaces 25c and 26c are defined.

The groove bottom surfaces 25c and 26c of the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are formed in a curved shape protruding toward the inside in the radial direction. In the longitudinal sectional view, the curvature radii of the groove bottom surfaces 25c and 26c are equal to each other. In the illustrated example, the radius of curvature of each groove bottom surface 25c, 26c is, for example, about 0.5 mm in the longitudinal sectional view. In addition, in the longitudinal sectional view, the curvature radii of the groove bottom surfaces 25c and 26c may be different from each other.
The radial positions of the groove bottom surfaces 25c and 26c of the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are equal to each other. The groove bottom surfaces 25 c and 26 c of the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are located on the outer side in the radial direction from the inner end portion in the radial direction of the annular groove 15.

The upper wall surface 25a of the upper auxiliary annular groove 25 gradually extends outward in the radial direction from the groove bottom surface 25c upward. The upper end portion of the upper wall surface 25a is connected to a portion (hereinafter referred to as an upper connecting portion) 13b connected to the upper auxiliary annular groove 25 from above in the body portion 13 without a step. The upper wall surface 25a of the upper auxiliary annular groove 25 is formed in a curved surface shape that protrudes outward in the radial direction. In the longitudinal sectional view along the vertical direction, the length of the upper wall surface 25a in the upper auxiliary annular groove 25 is longer than the length of the lower wall surface 25b. The lower wall surface 25b in the longitudinal sectional view is formed in a curved surface protruding outward in the radial direction, and has a radius of curvature of about 2 mm.
In addition, in the longitudinal sectional view, the upper wall surface 25a of the upper auxiliary annular groove 25 may extend straight, and the length of the upper wall surface 25a in the upper auxiliary annular groove 25 may be equal to or less than the length of the lower wall surface 25b.

The lower wall surface 26b of the lower auxiliary annular groove 26 gradually extends outward in the radial direction as it goes downward from the groove bottom surface 26c. The lower end portion of the lower wall surface 26b is connected to a portion (hereinafter referred to as a lower connecting portion) 13c that is continuous from the lower side with respect to the lower auxiliary annular groove 26 in the body portion 13 without a step. The lower wall surface 26b of the lower auxiliary annular groove 26 is formed in a curved surface shape protruding outward in the radial direction. In the longitudinal sectional view, the length of the lower wall surface 26b in the lower auxiliary annular groove 26 is longer than the length of the upper wall surface 26a. The upper wall surface 26a is formed in a curved shape protruding toward the outside in the radial direction in the longitudinal sectional view, and has a curvature radius of about 2 mm.
In the longitudinal sectional view, the lower wall surface 26b of the lower auxiliary annular groove 26 may extend straight, and the length of the lower wall surface 26b in the lower auxiliary annular groove 26 may be equal to or shorter than the length of the upper wall surface 26a.

In the longitudinal sectional view, the radius of curvature of the lower wall surface 26 b of the lower auxiliary annular groove 26 is smaller than the radius of curvature of the upper wall surface 25 a of the upper auxiliary annular groove 25. In the longitudinal sectional view, the curvature radius of the lower wall surface 26b of the lower auxiliary annular groove 26 is, for example, about 9 mm, and the curvature radius of the upper wall surface 25a of the upper auxiliary annular groove 25 is, for example, about 16 mm.
In addition, the curvature radius of the lower wall surface 26b of the lower auxiliary annular groove 26 in the longitudinal sectional view may be equal to or larger than the curvature radius of the upper wall surface 25a of the upper auxiliary annular groove 25.

In the body portion 13, each portion located between the annular groove 15 and the upper auxiliary annular groove 25 and between the annular groove 15 and the lower auxiliary annular groove 26 has a curved surface shape protruding outward in the radial direction. The upper protruding curved surface portion 27 and the lower protruding curved surface portion 28 are formed.
In the body portion 13, each portion located between the annular groove 15 and the upper auxiliary annular groove 25 and between the annular groove 15 and the lower auxiliary annular groove 26 extends in the vertical direction in the longitudinal sectional view. Also good.

The upper projecting curved surface portion 27 is connected to the lower end of the lower wall surface 25b of the upper auxiliary annular groove 25 and the upper end of the annular groove 15 without a step, and the lower projecting curved surface portion 28 is the upper end of the upper wall surface 26a of the lower auxiliary annular groove 26, and The lower end of the annular groove 15 is continuous without a step.
The radial positions of the outer end portion in the radial direction of the upper projecting curved surface portion 27 and the outer end portion in the radial direction of the lower projecting curved surface portion 28 are equal to each other.

Here, the radial positions of the upper continuous portion 13b and the lower continuous portion 13c in the body portion 13 are equal to each other. The radial positions of the radially outer end of the upper projecting curved surface portion 27, the radially outer end of the lower projecting curved surface portion 28, the upper connecting portion 13b, and the lower connecting portion 13c are equal to each other. ing.
The radially outer end of the upper projecting curved surface portion 27, the radially outer end of the lower projecting curved surface portion 28, the upper connecting portion 13b, and the lower connecting portion 13c are made different from each other in the radial direction. May be.

In the longitudinal sectional view, the curvature radii of the upper projecting curved surface portion 27 and the lower projecting curved surface portion 28 are equal to each other. In the longitudinal sectional view, each curvature radius of the upper projecting curved surface portion 27 and the lower projecting curved surface portion 28 is, for example, about 2 mm. Note that the radii of curvature of the upper projecting curved surface portion 27 and the lower projecting curved surface portion 28 may be different from each other in the longitudinal sectional view.
In the longitudinal sectional view, the curvature radii of the upper projecting curved surface portion 27 and the lower projecting curved surface portion 28 are larger than the curvature radii of the groove bottom surfaces 25c and 26c, and the lower wall surface 26b and the upper auxiliary annular groove 25 of the lower auxiliary annular groove 26. It is smaller than the respective curvature radii of the upper wall surface 25 a and the annular groove 15. The radius of curvature of the annular groove 15 in the longitudinal sectional view is about 3.7 mm.

  As described above, according to the bottle 1 according to the present embodiment, the body portion 13 is formed with the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 that are separately provided on both sides of the annular groove 15 in the vertical direction. Therefore, the rigidity against the lateral load can be reliably improved, and when a large compressive load is applied in the vertical direction, the body portion 13 expands in one of the radial directions, and When attempting to deform irreversibly so as to shrink in the other direction perpendicular to one direction, the body portion 13 is positioned between the annular groove 15 and the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26. The upper projecting curved surface portion 27 and the lower projecting curved surface portion 28 act as ribs, and buckling deformation of the body portion 13 can be suppressed.

Moreover, since the depths of the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are shallower than the depth of the annular groove 15, when a large compressive load is applied in the vertical direction, the upper auxiliary annular groove 25 and the lower auxiliary annular groove It becomes possible to suppress the deformation | transformation of the trunk | drum 13 so that the groove | channel 26 may collapse in an up-down direction, and the buckling strength of the trunk | drum 13 can be improved reliably.
Further, since the widths of the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 are narrower than the width of the annular groove 15, when a large compressive load is applied in the vertical direction, the upper auxiliary annular groove 25 and the lower auxiliary annular groove It can suppress reliably that the trunk | drum 13 deform | transforms so that 26 may be crushed in the up-down direction.

  Moreover, in the trunk | drum 13, the upper protrusion curved surface part 27 and the lower protrusion curved surface part 28 which are located between the annular groove 15, the upper auxiliary | assistant annular groove 25, and the lower auxiliary | assistant annular groove 26 face toward the radial direction outer side. Since it is formed in a curved surface shape and is continuously connected to the annular groove 15, the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26, when a large compressive load is applied in the vertical direction, It is possible to reliably suppress the buckling deformation of the portion 13 and to reliably improve the rigidity against the lateral load.

  Next, a description will be given of the operation and effect verification test described above.

As an example, the bottle 1 shown in FIG. 1 was adopted, and as a comparative example, a bottle without the upper auxiliary annular groove 25 and the lower auxiliary annular groove 26 was adopted in the bottle 1 of the example.
Then, for each of the example and the comparative example, the buckling strength and the amount of displacement when compressed in the vertical direction in a state where the head space of 5% with respect to the internal volume was provided and sealed were calculated by numerical analysis. The buckling strength is the axial force that the bottle received immediately before buckling deformation, and the displacement is the displacement of the entire height of the bottle until just before buckling deformation.
As a result, in the comparative example, the buckling strength is 310.2 N and the displacement amount is 2.94 mm. In the embodiment, the buckling strength is 353.0 N and the displacement amount is 3.69 mm. In both cases, it was confirmed that the buckling point was the lower end of the trunk. That is, it was confirmed that the buckling strength was improved by 13.8% and the displacement amount was improved by 25.5% in the example as compared with the comparative example.

  The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the heel portion 17 is configured to have a curved surface protruding outward in the radial direction. However, a configuration extending in the vertical direction may be employed.
Further, the heel portion 17 may not include the second portion 22 and the third portion 23 but may be configured by the first portion 21 over the entire circumference.

The synthetic resin material forming the bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof.
Further, the bottle 1 is not limited to a single layer structure, and may be a laminated structure having an intermediate layer. Examples of the intermediate layer include a layer made of a resin material having a gas barrier property, a layer made of a recycled material, or a layer made of a resin material having an oxygen absorbing property.
Moreover, in the said embodiment, although the cross-sectional view shape orthogonal to each bottle axis | shaft O of the mouth part 11, the shoulder part 12, the trunk | drum 13, and the bottom part 14 was circular shape, it is not restricted to this, For example, it is square shape. It may be changed as appropriate.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the modification examples may be combined as appropriate.

1 bottle 13 body 15 annular groove 25 upper auxiliary annular groove (auxiliary annular groove)
26 Lower auxiliary annular groove (auxiliary annular groove)

Claims (3)

A bottomed cylindrical bottle formed of a synthetic resin material,
An annular groove extending continuously over the entire circumference and a pair of auxiliary annular grooves separately extending on both sides sandwiching the annular groove in the vertical direction are formed in the body portion. ,
The bottle characterized in that the depth of the auxiliary annular groove is shallower than the depth of the annular groove.   The bottle according to claim 1, wherein the width of the groove bottom surface of the auxiliary annular groove is narrower than the width of the annular groove.   In the trunk portion, each portion located between the annular groove and the pair of auxiliary annular grooves is formed in a curved surface shape protruding outward in the radial direction, and the annular groove and the auxiliary annular groove The bottle according to claim 1 or 2, wherein the bottle is continuous without any step.

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