JP2022013712A - Bottle - Google Patents

Abstract

To provide a bottle capable of suppressing buckling from occurring at, as a start point, a lower end of a reduction-pressure absorbing panel provided in a shoulder when a compression force is applied in a bottle-axis direction in an empty state.SOLUTION: A bottle includes a barrel 13 where a plurality of peripheral grooves 15 continuously extending over the entire length in a circumferential direction are formed spaced axially of the bottle, each of which peripheral grooves assumes a wavy shape cyclically extending in a circumferential direction while curving in a bottle axis-O direction as viewed radially from external. The bottle further includes a shoulder 12 where a plurality of reduction-pressure absorbing panels 31 recessed radially inwardly are provided spaced circumferentially, each of which reduction-pressure absorbing panels is defined by a panel bottom face 32 facing radially outward and a panel side face 33 rising from an outer peripheral edge of the panel bottom face, a reinforcing protrusion 34 is provided over a panel lower-end face 33a of the panel side face positioned at a lower end and faced upward and the panel bottom face, which reinforcing protrusion has an upper end edge positioned lower than a central portion in the panel bottom face in a vertical sectional view taken along the bottle axis.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bottle.

Conventionally, the mouth, shoulders, body, and bottom are connected in this order from top to bottom along the bottle axis direction, and as a bottle integrally formed of a synthetic resin material, for example, the following. As shown in Patent Document 1, a plurality of peripheral grooves continuously extending over the entire length in the circumferential direction are formed on the body portion at intervals in the bottle axis direction, and each peripheral groove is viewed from the outside in the radial direction. , A configuration is known that exhibits a wave shape that periodically extends in the circumferential direction while bending in the bottle axial direction.
By forming a wavy peripheral groove in the body portion, for example, rigidity and design can be enhanced.
However, in this case, since it is difficult to provide a decompression absorption panel that is recessed inward in the radial direction on the body portion, it is conceivable to provide a decompression absorption panel on the shoulder portion.

Japanese Unexamined Patent Publication No. 9-24847

However, in the conventional bottle, when a compressive force in the bottle axial direction is applied in an empty state, stress concentrates on the lower end portion of the decompression absorption panel provided on the shoulder portion, and the bottle buckles from this portion as a starting point. There was a risk that it would be easier.

Therefore, the present invention provides a bottle capable of suppressing buckling from the lower end portion of the decompression absorption panel provided on the shoulder portion when a compressive force in the bottle axial direction is applied in an empty state. The purpose is.

The present invention employs the following means to solve the above problems. That is, in the bottle of the present invention, the mouth, shoulder, body, and bottom are connected in this order from top to bottom along the bottle axis direction, and are integrally formed of a synthetic resin material. A plurality of peripheral grooves continuously extending over the entire length in the circumferential direction are formed on the body portion at intervals in the bottle axial direction, and each peripheral groove is bent in the bottle axial direction when viewed from the outside in the radial direction. However, a plurality of decompression absorption panels having a wave shape extending periodically in the circumferential direction and denting inward in the radial direction are provided on the shoulder portion at intervals in the circumferential direction, and the decompression absorption panel has a diameter. The bottom surface of the panel facing outward in the direction and the side surface of the panel rising from the outer peripheral edge of the bottom surface of the panel are defined by the bottom surface of the panel located at the lower end of the side surface of the panel and facing upward, and the bottom surface of the panel. A reinforcing protrusion is provided so as to straddle the bottle, and the upper end edge of the reinforcing protrusion is located below the central portion on the bottom surface of the panel in a vertical cross-sectional view along the bottle axis.

In the present invention, since the reinforcing protrusion is provided straddling the lower end surface of the panel and the bottom surface of the panel, the rigidity of the lower end portion of the decompression absorption panel is increased, and a compressive force in the bottle axial direction is applied in an empty state. At that time, it is possible to prevent the bottle from buckling starting from the lower end of the decompression absorption panel.
Since the upper end edge of the reinforcing protrusion is located below the central portion of the bottom surface of the panel in the vertical cross-sectional view along the bottle axis, the area of the reinforcing protrusion occupying the bottom surface of the panel is suppressed, and the reinforcing protrusion is provided. It is possible to suppress the deterioration of the vacuum absorption performance due to this.

The peripheral grooves are provided with a plurality of upper portions of the protrusions facing upward and a plurality of lower peaks of the protrusions facing downward, which are alternately provided at intervals in the circumferential direction. Even if the pillars located between the adjacent decompression absorption panels and the lower apex of the uppermost peripheral groove located at the uppermost position of the plurality of peripheral grooves are in the same circumferential position. good.

In this case, since the positions of the pillar portion of the shoulder portion and the lower top portion of the upper end peripheral groove are the same in the circumferential direction, the bottle shaft of the portion of the upper end portion of the body portion located directly below the pillar portion. It is possible to secure a long length in the direction, and when a compressive force in the bottle axis direction is applied, the load propagated from the pillar to the upper end of the body is dispersed and relaxed to reduce the pressure. It is possible to make it difficult for stress to concentrate on the lower end of the absorption panel.

The peripheral groove is provided with a plurality of top portions of protrusions facing upward and a plurality of lower top portions of protrusions facing downward, which are alternately provided at intervals in the circumferential direction. Of the peripheral grooves, the positions in the circumferential direction of the upper top portions of the uppermost peripheral groove located at the uppermost position may be the same as each other.

In this case, since the positions of the reinforcing protrusion and the upper top of the upper end peripheral groove are the same in the circumferential direction, the bottle shaft of the corresponding portion of the upper end of the body portion located directly below the reinforcing protrusion. The length in the direction is suppressed, the rigidity of the corresponding portion can be increased, and the rigidity of the lower end portion of the decompression absorption panel adjacent to the corresponding portion in the bottle axis direction can be effectively increased.

On the bottom surface of the panel, a recess portion that is recessed inward in the radial direction may be formed in a portion located above the reinforcing protrusion.

In this case, since a recess is formed in a portion of the bottom surface of the panel located above the reinforcing protrusion, the bottom surface of the panel starts from the reinforcing protrusion during so-called heat filling, in which the heated contents are filled. Even if it swells, when the contents are cooled while the inside of the bottle is sealed and the inside of the bottle is in a decompressed state, the entire bottom surface of the panel including the reinforcing protrusion is easily restored and deformed starting from the recessed part. be able to.

The reinforcing protrusion has a triangular shape with an apex angle at the upper end when viewed from the outside in the radial direction, and the recess is adjacent to the upper end of the reinforcing protrusion in the bottle axial direction on the bottom surface of the panel. It may be provided in the portion.

In this case, since the recessed portion is provided on the bottom surface of the panel at the portion adjacent to the upper end portion of the reinforcing protrusion forming the triangular apex angle in the direction of the bottle axis, the recessed portion is formed when the inside of the bottle is in a decompressed state. By starting from the portion, it becomes possible to evenly restore and deform the entire bottom surface of the panel including the reinforcing protrusion, and it is possible to surely suppress the occurrence of poor appearance.

According to the present invention, when a compressive force in the bottle axial direction is applied in an empty state, it is possible to suppress buckling from the lower end portion of the decompression absorption panel provided on the shoulder portion as a starting point.

It is a side view of the bottle shown as one Embodiment which concerns on this invention. FIG. 2 is a cross-sectional view taken along the line II-II of the bottle shown in FIG. It is a side view of the bottle shown as the modification which concerns on this invention. It is a side view of the bottle shown as another embodiment which concerns on this invention. FIG. 4 is a cross-sectional view taken along the line VV of the bottle 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 FIG. 1, the bottle 1 according to the present embodiment includes a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14, and these 11 to 14 have their respective central axes positioned on a common axis. In this state, it has a schematic configuration in which they are connected in this order.

Hereinafter, the common axis is referred to as a bottle shaft O, the mouth 11 side along the bottle shaft O is referred to as an upper side, the bottom 14 side is referred to as a lower side, and the direction along the bottle shaft O is referred to as a bottle shaft O direction. The direction that intersects the bottle axis O when viewed from the bottle axis O direction is called the radial direction, and the direction that orbits around the bottle axis O is called the 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. The mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 each have a circular cross-sectional view shape orthogonal to the bottle axis O.
The cross-sectional view shape orthogonal to the bottle axis O of each of the shoulder portion 12, the body portion 13, and the bottom portion 14 may be, for example, a square shape or the like.

The bottom portion 14 has a cylindrical heel portion 17 in which the upper end opening is connected to the lower end opening of the body portion 13, and a bottom portion in which the lower end opening of the heel portion 17 is closed and the outer peripheral edge portion is a ground contact portion 18. It is formed in a cup shape including a wall portion 19.

A plurality of fine grooves 17a extending continuously over the entire length in the circumferential direction are formed in the heel portion 17 at intervals in the bottle axis O direction. The narrow groove 17a extends linearly when viewed from the outside in the radial direction. The narrow groove 17a may not be provided.
The bottom wall portion 19 includes a rising peripheral wall portion 21 that is connected to the ground contact portion 18 from the inside in the radial direction and extends upward, and an annular movable wall portion 22 extending inward in the radial direction from the upper end portion of the rising peripheral wall portion 21. A central wall portion 23 connected to a radial inner end portion of the movable wall portion 22 is provided.

When the bottle 1 is filled with high temperature (for example, about 40 ° C. to 95 ° C.) contents, the movable wall portion 22 is displaced and deformed downward, and when the inside of the bottle 1 is sealed in this state, after that, When the pressure inside the bottle 1 is reduced due to the cooling of the bottle 1, the movable wall portion 22 is deformed upward and rotates upward around the outer end portion in the radial direction, and this reduced pressure is absorbed.

The body portion 13 is formed with a first peripheral groove 15 and a second peripheral groove 13a that extend continuously over the entire length in the circumferential direction. A plurality of the first peripheral groove 15 and the second peripheral groove 13a are provided at intervals in the bottle axis O direction, respectively.
The second peripheral groove 13a may not be provided.

The first peripheral groove 15 exhibits a wave shape that periodically extends in the circumferential direction while bending in the bottle axis O direction when viewed from the outside in the radial direction. The groove width of the first peripheral groove 15 is the same over the entire length. The groove widths of the plurality of first peripheral grooves 15 are the same as each other.
The first peripheral groove 15 is provided with a plurality of upper top portions 26 of the protrusions facing upward and a plurality of lower top portions 27 of the protrusions facing downward, which are alternately provided at intervals in the circumferential direction. The phases of the plurality of first peripheral grooves 15 are in agreement with each other. The first peripheral groove 15 extends periodically in the circumferential direction so as to have one cycle in an angle range of about 60 ° about the bottle axis O. In the two first peripheral grooves 15 adjacent to each other in the bottle axis O direction, the lower top portion 27 of the first peripheral groove 15 located on the upper side is located above the upper top portion 26 of the first peripheral groove 15 located on the lower side. As such, they are separated in the bottle axis O direction.

The phases of the plurality of first peripheral grooves 15 may be different from each other, and the angle range of one cycle of the first peripheral groove 15 may be appropriately changed, and the two second positions adjacent to each other in the bottle axis O direction may be changed as appropriate. In the 1-circle groove 15, the lower top portion 27 of the 1st peripheral groove 15 located on the upper side is located below the upper top portion 26 of the 1st peripheral groove 15 located on the lower side, or at the same position in the bottle axis O direction. It may be provided so as to do so.

Of the plurality of first peripheral grooves 15, the distance between the uppermost portion 26 of the uppermost peripheral groove 15a located at the uppermost position and the upper end edge of the body portion 13 in the bottle axis O direction is the distance in one first peripheral groove 15. It is smaller than the distance between the upper top portion 26 and the lower top portion 27 in the bottle axis O direction (hereinafter referred to as the total width) and the distance between the first peripheral grooves 15 adjacent to each other in the bottle axis O direction. In the illustrated example, the total width of the upper end peripheral groove 15a is narrower than the total width of each of the other first peripheral grooves 15.
The distance may be equal to or greater than the total width of the first peripheral groove 15 and the distance between the first peripheral grooves 15. The total width of each of the plurality of first peripheral grooves 15 may be the same as each other.

The second peripheral groove 13a extends linearly when viewed from the outside in the radial direction. The second peripheral groove 13a is provided in the central portion of the body portion 13 in the bottle axis O direction. In the body portion 13, a plurality of first peripheral grooves 15 are provided on both sides of the second peripheral groove 13a in the bottle axis O direction.

Of the plurality of first peripheral grooves 15, the lower top portion 27 of the first inner peripheral groove 15b adjacent to the plurality of second peripheral grooves 13a from above the second peripheral groove 13a, and the plurality of second peripheral grooves 13a are second. The distance between the upper top portion 26 of the second inner peripheral groove 15c adjacent from the lower side of the peripheral groove 13a and the plurality of second peripheral grooves 13a in the bottle axis O direction is the total width of the first peripheral groove 15 and the bottle. It is smaller than the distance between the first peripheral grooves 15 adjacent to each other in the axis O direction.
The distance may be equal to or greater than the total width of the first peripheral groove 15 and the distance between the first peripheral grooves 15.

The shoulder portion 12 extends radially inward as it goes upward. A plurality of decompression absorption panels 31 recessed inward in the radial direction are provided on the shoulder portion 12 at intervals in the circumferential direction.
The decompression absorption panel 31 is provided over the entire area of the shoulder portion 12 in the bottle axis O direction excluding the upper end portion and the lower end portion. The depth of the decompression absorption panel 31 becomes deeper from the upper side to the lower side. The length of the decompression absorption panel 31 in the circumferential direction becomes shorter toward the upper side. The decompression absorption panel 31 has a trapezoidal shape when viewed from the outside in the radial direction.
As the decompression absorption panel 31, a configuration may be adopted that exhibits, for example, a semicircular shape when viewed from the outside in the radial direction.

In the shoulder portion 12, a portion located between the decompression absorption panels 31 adjacent to each other in the circumferential direction is a pillar portion 35 extending in the bottle axis O direction when viewed from the outside in the radial direction.
The circumferential region where one decompression absorption panel 31 and the pair of pillars 35 sandwiching the decompression absorption panel 31 in the circumferential direction are located is the circumferential region where one cycle of the first peripheral groove 15 is located. Is consistent with. In the illustrated example, the positions of the pillar portion 35 and the lower top portion 27 of the upper end peripheral groove 15 in the circumferential direction are the same as each other.

The positions of the pillar portion 35 and the lower top portion 27 of the upper end peripheral groove 15 in the circumferential direction may be different from each other. A circumferential region in which one vacuum absorption panel 31 and a pair of pillars 35 sandwiching the vacuum absorption panel 31 in the circumferential direction are located, and a circumferential region in which one cycle of the first peripheral groove 15 is located. It may be different from a part of.

As shown in FIG. 2, the decompression absorption panel 31 is defined by a panel bottom surface 32 facing outward in the radial direction and a panel side surface 33 rising outward from the outer peripheral edge of the panel bottom surface 32. The bottom surface 32 of the panel extends inward in the radial direction as it goes upward. The panel side surface 33 surrounds the panel bottom surface 32 over the entire circumference. The angle formed by the panel bottom surface 32 and the panel side surface 33 is an obtuse angle.
Of the panel side surface 33, the reinforcing protrusion 34 is provided so as to straddle the panel lower end surface 33a located at the lower end and facing upward and the panel bottom surface 32.

The upper end edge of the reinforcing protrusion 34 is located below the central portion of the bottom surface 32 of the panel in the vertical cross-sectional view along the bottle axis O. The amount of protrusion of the reinforcing protrusion 34 from the bottom surface 32 of the panel decreases toward the upper side in the vertical cross-sectional view. The amount of protrusion of the reinforcing protrusion 34 from the bottom surface 32 of the panel decreases from the central portion to the outside along the circumferential direction. The reinforcing protrusion 34 exhibits a curved shape of the protrusion toward the outside of the panel bottom surface 32 in a cross-sectional view along the radial direction.

The length of the reinforcing protrusion 34 becomes shorter in the circumferential direction toward the upper side. The reinforcing protrusion 34 has a triangular shape having an apex angle at the upper end when viewed from the outside in the radial direction. The reinforcing protrusion 34 has an isosceles triangle shape when viewed from the outside in the radial direction. At least a part of the reinforcing protrusion 34 is located at the central portion in the circumferential direction of the pressure reducing absorption panel 31. In the illustrated example, the central portion in the circumferential direction of each of the reinforcing protrusion 34 and the decompression absorption panel 31 coincides with each other. The reinforcing protrusions 34 are located inside the pressure reducing absorption panel 31 in the circumferential direction from both ends in the circumferential direction.

The central portion of the reinforcing protrusion 34 and the decompression absorption panel 31 in the circumferential direction may be separated from each other, and the reinforcing protrusion 34 is separated from the central portion of the decompression absorption panel 31 in the circumferential direction in the circumferential direction. The reinforcing protrusions 34 may be provided over the entire circumferential direction of the decompression absorption panel 31, and a plurality of reinforcing protrusions 34 may be provided on one decompression absorption panel 31 along the circumferential direction. The reinforcing protrusion 34 may have a rectangular shape or the like extending in the bottle axis O direction when viewed from the outside in the radial direction.

The positions of the reinforcing protrusion 34 and the upper top portion 26 of the upper end peripheral groove 15 in the circumferential direction are the same as each other.
The positions of the reinforcing protrusion 34 and the upper top portion 26 of the upper end peripheral groove 15 in the circumferential direction may be different from each other.

As described above, according to the bottle 1 according to the present embodiment, since the reinforcing protrusion 34 is provided straddling the panel lower end surface 33a and the panel bottom surface 32, the rigidity of the lower end portion of the decompression absorption panel 31 is increased. It is possible to prevent the bottle 1 from buckling starting from the lower end portion of the decompression absorption panel 31 when a compressive force in the O direction of the bottle axis is applied in an increased state.
Since the upper end edge of the reinforcing protrusion 34 is located below the central portion of the panel bottom surface 32 in the vertical cross-sectional view, the area of the reinforcing protrusion 34 occupying the panel bottom surface 32 is suppressed, and the reinforcing protrusion 34 is provided. It is possible to suppress the deterioration of the vacuum absorption performance due to the provision.

Since the positions of the pillar portion 35 of the shoulder portion 12 and the lower top portion 27 of the upper end peripheral groove 15 in the circumferential direction are the same as each other, the portion of the upper end portion of the body portion 13 located directly below the pillar portion 35. It is possible to secure a long length of 13b (hereinafter referred to as a propagation portion) in the bottle axis O direction. As a result, when the compressive force in the bottle axis O direction is applied, the load propagated from the pillar portion 35 to the upper end portion of the body portion 13 is dispersed and relaxed by the propagation portion 13b, whereby the decompression absorption panel 31 It is possible to make it difficult to concentrate stress on the lower end.

Since the positions of the reinforcing protrusion 34 and the upper top portion 26 of the upper end peripheral groove 15 in the circumferential direction are the same as each other, the corresponding portion 13c of the upper end portion of the body portion 13 located directly below the reinforcing protrusion 34. The length of the bottle shaft O direction is suppressed, the rigidity of the corresponding portion 13c can be increased, and the rigidity of the lower end portion of the decompression absorption panel 31 adjacent to the corresponding portion 13c in the bottle axis O direction is effectively increased. be able to.

Next, the bottle 3 according to another embodiment will be described with reference to FIGS. 4 and 5.
In this embodiment, the same parts as the components in the above-described embodiment are designated by the same reference numerals, the description thereof will be omitted, and only the differences will be described.

In the present embodiment, a recessed portion 41 that is recessed inward in the radial direction is formed in a portion of the bottom surface 32 of the panel that is located above the reinforcing protrusion 34.
The recess 41 is a vertical groove long in the bottle axis O direction. The circumferential size, that is, the width of the recess 41 is smaller than the circumferential size at the lower end of the reinforcing protrusion 34. The widths of both ends of the recess 41 in the bottle axis O direction become smaller toward the outside in the bottle axis O direction. The depth of the recess 41 is shallower than the depth of the decompression absorption panel 31.

The recessed portion 41 is provided on the bottom surface 32 of the panel at a portion adjacent to the upper end portion of the reinforcing protrusion 34 forming a triangular apex angle in the bottle axis O direction. The lower end of the recess 41 is located above the upper end of the reinforcing protrusion 34. The upper end portion of the recessed portion 41 is located below the upper end edge of the panel bottom surface 32. The recess 41 is provided at the center of the bottom surface 32 of the panel in the circumferential direction.

As described above, according to the bottle 3 according to the present embodiment, the recessed portion 41 is formed in the portion of the bottom surface 32 of the panel located above the reinforcing protrusion 34, so that the heated contents are filled. Even if the bottom surface 32 of the panel bulges from the reinforcing protrusion 34 during so-called heat filling, the contents are cooled while the inside of the bottle 3 is sealed, and the inside of the bottle 3 is in a depressurized state. Starting from the portion 41, the entire panel bottom surface 32 including the reinforcing protrusion 34 can be easily restored and deformed.

Since the recess 41 is provided on the bottom surface 32 of the panel at a portion adjacent to the upper end of the reinforcing protrusion 34 forming a triangular apex angle in the O direction of the bottle axis, when the inside of the bottle 3 is in a depressurized state. By starting from the recessed portion 41, it becomes possible to make it easier to uniformly restore and deform the entire panel bottom surface 32 including the reinforcing protrusion 34, and it is possible to reliably suppress the occurrence of appearance defects.

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

For example, as in the bottle 2 shown in FIG. 3, the positions of the pillar portion 35 and the upper top portion 26 of the upper end peripheral groove 15 in the circumferential direction are the same as each other, and below the reinforcing protrusion 34 and the upper end peripheral groove 15. The positions of the tops 27 in the circumferential direction may be the same as each other.
In the bottle 2, when the cross-sectional view shape orthogonal to the bottle axis O of the body portion 13 is a square shape, the portions of the body portion 13 forming the corner portions in the cross-sectional view are, for example, the pillar portion 35 and the upper end. It may be located at a position in the circumferential direction where the upper top portion 26 of the peripheral groove 15 is located.

The synthetic resin material forming the bottles 1 to 3 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof.
The bottles 1 to 3 are not limited to the 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, a layer made of a resin material having an oxygen absorption property, and the like.

In addition, it is possible to appropriately replace the components in the embodiment with well-known components without departing from the spirit of the present invention, and the embodiments and the modifications may be appropriately combined.

1 to 3 Bottle 11 Mouth 12 Shoulder 13 Body 14 Bottom 15 1st peripheral groove (circumferential groove)
15a Upper end peripheral groove 26 Upper top 27 Lower top 31 Decompression absorption panel 32 Panel bottom 33 Panel side surface 33a Panel lower end surface 34 Reinforcing protrusion 35 Pillar 41 Recess O Bottle shaft

Claims (5)

The mouth, shoulders, torso, and bottom are connected in this order from top to bottom along the bottle axis, and are integrally formed of a synthetic resin material.
A plurality of circumferential grooves extending continuously over the entire length in the circumferential direction are formed on the body portion at intervals in the bottle axial direction.
Each of the peripheral grooves has a wave shape that extends periodically in the circumferential direction while bending in the bottle axis direction when viewed from the outside in the radial direction.
A plurality of decompression absorption panels recessed inward in the radial direction are provided on the shoulder portion at intervals in the circumferential direction.
The vacuum absorption panel is
The bottom of the panel facing outward in the radial direction, and
It is defined by the side surface of the panel rising from the outer peripheral edge of the bottom surface of the panel.
A reinforcing protrusion is provided on the lower end surface of the panel, which is located at the lower end and faces upward, and the bottom surface of the panel.
The upper end edge of the reinforcing protrusion is located below the central portion of the bottom surface of the panel in a vertical cross-sectional view along the bottle axis. The peripheral groove is provided with a plurality of top portions of the protrusions facing upward and a plurality of lower top portions of the protrusions facing downward, which are alternately provided at intervals in the circumferential direction.
In the shoulder portion, the pillar portion located between the decompression absorption panels adjacent to each other in the circumferential direction, and the lower top portion of the uppermost peripheral groove located at the uppermost position among the plurality of peripheral grooves in the circumferential direction. The bottle according to claim 1, wherein the bottles are in the same position as each other. The peripheral groove is provided with a plurality of top portions of the protrusions facing upward and a plurality of lower top portions of the protrusions facing downward, which are alternately provided at intervals in the circumferential direction.
The bottle according to claim 1 or 2, wherein the reinforcing protrusions and the peripheral grooves of the plurality of peripheral grooves have the same circumferential positions of the uppermost peripheral portions of the uppermost peripheral groove. .. The bottle according to any one of claims 1 to 3, wherein a recess portion recessed inward in the radial direction is formed in a portion of the bottom surface of the panel located above the reinforcing protrusion. The reinforcing protrusion has a triangular shape with an apex angle at the upper end when viewed from the outside in the radial direction.
The bottle according to claim 4, wherein the recessed portion is provided on the bottom surface of the panel at a portion adjacent to the upper end portion of the reinforcing protrusion portion in the bottle axial direction.

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