JP2012131561A - Bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottle which has improved handleability of the bottle while maintaining decompression absorbing performance of the bottle.SOLUTION: The diameter of a body 13 becomes smaller gradually toward the inside in a radial direction as it goes toward the inside from the outside in a direction of a bottle axis O, and a bottom wall part 21 located inside in the radial direction at a panel part 17 is formed such that longitudinal section shape thereof along an axial direction is formed as a flat surface.

Description

  The present invention relates to a bottle.

Conventionally, as a bottle formed in a bottomed cylindrical shape with a synthetic resin material, for example, as shown in Patent Document 1 below, a mouth, a shoulder, a trunk, and a bottom are integrally formed, A configuration is known in which a plurality of panel portions recessed toward the inside in the radial direction are formed at intervals in the circumferential direction.
According to this configuration, for example, when the temperature of the contents sealed in the bottle is reduced and the inside of the bottle is decompressed, the panel portion is preferentially deformed toward the inside in the radial direction, thereby reducing the pressure inside the bottle. To absorb.

JP 2010-76821 A

  By the way, in the conventional bottle mentioned above, there existed room for improvement in improving handling property, maintaining the decompression absorption performance in a bottle.

  Then, this invention is made | formed in view of the situation mentioned above, The objective is to provide the bottle which can improve the handling property of a bottle, maintaining the decompression absorption performance of a bottle. .

In order to solve the above problems, the present invention proposes the following means.
The bottle according to the present invention is a bottle in which a plurality of panel portions that are recessed toward the inside in the radial direction are formed in the cylindrical body portion at intervals in the circumferential direction, and the body portion is in the axial direction. The bottom wall portion that is gradually reduced in diameter toward the inner side in the radial direction from the outer side to the inner side of the panel, and the vertical cross-sectional shape along the axial direction is formed on a flat surface in the bottom wall portion that is located on the inner side in the radial direction of the panel It is characterized by that.

With such a feature, since the body portion is gradually reduced in diameter from the outside in the axial direction toward the inside, the handling property when gripping the bottle can be improved.
Furthermore, when the inside of the bottle is depressurized, the panel portion is preferentially deformed toward the inside in the radial direction, so that the depressurization in the bottle can be absorbed. Moreover, since the bottom wall portion of the panel portion is formed on a flat surface, it is radially inward compared to the case where the bottom wall portion is formed by gradually reducing the diameter from the outside in the axial direction toward the inside in the same manner as the body portion. The amount of deformation of the bottom wall can be secured.

  According to the bottle of the present invention, the handling property of the bottle can be improved while maintaining the reduced pressure absorption performance of the bottle.

It is a side view of the bottle in the embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is an expanded sectional view of FIG.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
1 and 2, the bottle 1 according to the present 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.

Hereinafter, the above-described 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, and the direction orthogonal to the bottle axis O is referred to as the radial direction. The direction 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. Further, a cap (not shown) is attached to the mouth portion 11. Further, each of the mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 has a circular shape in a cross-sectional view orthogonal to the bottle axis O.

In the connection portion between the shoulder portion 12 and the body portion 13 and the connection portion between the body portion 13 and the bottom portion 14, a concave groove 16 that is recessed toward the inside in the radial direction is formed continuously over the entire circumference. ing.
The body portion 13 is formed in a cylindrical shape, and its outer peripheral surface has a curved shape that gradually decreases in diameter from the outer side (upper and lower end portions) to the inner side (center portion) in the bottle axis O direction toward the inner side in the radial direction. That is, the body portion 13 is formed with a smaller diameter on the inner side in the bottle axis O direction than the outer side, and the overall appearance is formed in a constricted shape.

  Here, the body portion 13 is formed with a plurality of vacuum absorbing panel portions 17 that are recessed inward in the radial direction at intervals in the circumferential direction. And in the trunk | drum 13, the part located between the panel parts 17 adjacent in the circumferential direction comprises the pillar part 19 extended along the bottle axis | shaft O direction. That is, in the body portion 13, the concave panel portions 17 and the convex column portions 19 are alternately arranged in the circumferential direction.

The panel part 17 is erected so as to surround the bottom wall part 21 formed in a rectangular shape with the bottle axis O direction as a longitudinal direction when viewed from the outside in the radial direction, and the bottom wall part 21 over the entire circumference. And a side wall portion 22. As shown in FIGS. 1-3, a pair of vertical side wall part 22a which is located in the both sides of the circumferential direction among the side wall parts 22, and is extended in a bottle axis | shaft O direction is a circumferential direction outer side as it goes to an outer side from radial inside. It is set as the inclined surface which inclines toward (the direction which each vertical side wall part 22a spaces apart). The column part 19 positioned between the panel parts 17 adjacent to each other in the circumferential direction is such that the cross-sectional view perpendicular to the bottle axis O decreases in the circumferential direction from the inner side to the outer side in the radial direction. It is formed into a shape.
On the other hand, a pair of side wall portions 22b (see FIG. 1) extending in the circumferential direction on both sides in the bottle axis O direction among the side wall portions 22 are arranged on the outer side (each of the bottle axis O direction from the inner side to the outer side in the radial direction). It is set as the inclined surface which inclines toward the direction which the side wall part 22b spaces apart.

  The bottom wall portion 21 is located on the inner side of the panel portion 17 in the radial direction, and as shown in FIG. 2, the vertical cross-sectional view shape along the bottle axis O is formed on a flat surface, as shown in FIG. 3. Moreover, the cross-sectional view shape orthogonal to the bottle axis O is also formed on a flat surface. That is, in the trunk portion 13, the column portion 19 described above has a constricted shape that gradually decreases in diameter from the outside toward the inside in the bottle axis O direction, while the bottom wall portion 21 of the panel portion 17. Has a planar shape along the bottle axis O direction.

  When the inside of the bottle 1 configured as described above is depressurized, the bottom wall portion 21 is deformed so as to bend inward in the radial direction around the connection portion between the bottom wall portion 21 and the side wall portion 22 in the panel portion 17. It will be. That is, when the bottom wall portion 21 of the panel portion 17 is preferentially deformed at the time of depressurization, the internal pressure change (depressurization) of the bottle 1 is not accompanied by deformation at other portions (for example, the column portion 19 and the shoulder portion 12). ) Can be absorbed.

As mentioned above, according to this embodiment, since the trunk | drum 13 (column part 19) was made into the constriction shape diameter-reduced toward the inner side from the outer side of the bottle axis | shaft O direction, the handleability at the time of holding the bottle 1 is improved. be able to.
In addition, in the present embodiment, since the bottom wall portion 21 of the panel portion 17 is formed on a flat surface, the bottom wall portion 21 is temporarily reduced in diameter from the outside toward the inside in the bottle axis O direction like the barrel portion 13. Compared to the case of bending, it is possible to secure the amount of deformation of the bottom wall portion 21 in the radial direction at the time of absorbing the reduced pressure.
Therefore, according to the bottle 1 of this embodiment, the handleability of the bottle 1 can be improved while maintaining the reduced pressure absorption performance.

  By the way, in this embodiment, although the bottom wall part 21 was formed in the flat surface as mentioned above, the bottom wall part 21 was temporarily bulged from the inner side to the outer side in the radial direction from the outer peripheral edge toward the central part. In this case, the bottom wall portion 21 is reversely deformed toward the inside in the radial direction during decompression. Specifically, the bottom wall portion 21 bulges from the outside in the radial direction toward the inside as it goes from the outer peripheral edge to the center portion. In this case, the decompression absorption performance of the panel portion 17 (bottom wall portion 21) itself is relatively high, and the decompression can be absorbed only by the deformation of the bottom wall portion 21. However, when the inside of the bottle 1 is further depressurized after the reverse deformation, the entire wall of the bottle 1 is deformed differently as the bottom wall portion 21 tries to be further displaced radially inward with the depressurization. Specifically, the bottle 1 is deformed into a triangular shape, an elliptical shape, or the like with a cross-sectional shape orthogonal to the bottle axis O direction.

  On the other hand, when the bottom wall portion 21 is formed on a flat surface as in the present embodiment shown in FIG. 4, if the bottom wall portion 21 is displaced toward the inside in the radial direction during decompression, the displacement is accompanied by this displacement. Thus, the vertical side wall portion 22a is displaced toward the inside of the column portion 19 with the outer end portion in the radial direction as the center (see the arrow in FIG. 4). That is, the vertical side wall portions 22a located on both sides of the column portion 19 in the circumferential direction are displaced so as to approach each other. Thereby, the rising angle from the bottom wall part 21 of the vertical side wall part 22a becomes steep, and the rigidity with respect to the radial direction of the column part 19 can be improved (see the solid line in FIG. 4). As a result, when the bottle 1 is depressurized or when an external force is applied, it is possible to suppress the occurrence of abnormal deformation of the bottle 1 or bending of the column part 19 in the radial direction.

  Here, the inventor of the present application analyzed the relationship between the reduced pressure strength (kPa) and the absorption capacity (ml) for each of the bottles of the present embodiment described above (hereinafter referred to as test bottles) and the comparative bottles. In addition, as a comparative bottle, while forming the trunk | drum 13 (column part 19) in the constriction shape diameter-reduced toward the inner side from the outer side of a bottle axis | shaft O direction, the bottom wall part 21 of the panel part 17 is made into the trunk | drum 13. Similarly, the one formed on a curved surface was used. Moreover, the thing for 500 ml was employ | adopted as a test bottle and a comparison bottle used for this analysis.

  First, for both bottles, it was confirmed that when the inside of the bottle was depressurized, the reduced pressure absorption capacity gradually increased as the depressurization strength increased. This is considered because the bottom wall part 21 of the panel part 17 deform | transformed toward the inner side of radial direction by pressure reduction in a bottle as mentioned above.

Thereafter, when the reduced pressure strength is further increased, in the comparative bottle, the increase in the reduced pressure strength cannot be followed, and local deformation may occur in places other than the panel portion 17 during the reduced pressure. The absorption capacity when local deformation occurred in the comparative bottle, that is, the maximum absorption capacity by the panel section 17 of the comparative bottle was 18.2 (ml).
On the other hand, the test bottle was able to withstand the maximum absorption capacity up to 27.3 (ml) against the increase in vacuum strength. As described above, since the bottom wall portion 21 of the panel portion 17 is formed on a flat surface in the test bottle, the bottom wall portion 21 of the panel portion 17 is positioned on the outer side in the radial direction as compared with the comparative bottle. It will be. For this reason, it is considered that a large amount of deformation of the bottom wall portion 21 in the radial direction during decompression can be secured.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

For example, the design of the curvature radius of the body portion 13 can be changed as appropriate.
Further, the number and arrangement of the panel portions 17 and the column portions 19 can be appropriately changed in consideration of the strength required for the bottle 1 and the reduced pressure absorption capacity.
Further, in the above-described embodiment, the cross-sectional view orthogonal to the bottle axis O of each of the shoulder portion 12, the body portion 13 and the bottom portion 14 is circular, but is not limited thereto, and for example, a polygonal shape is appropriately used. It may be changed.

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.

  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.

DESCRIPTION OF SYMBOLS 1 ... Bottle 13 ... Body part 17 ... Panel part 21 ... Bottom wall part

Claims (1)

In the cylindrical body part, a plurality of panel parts recessed toward the inside in the radial direction are formed at intervals in the circumferential direction,
The body portion gradually decreases in diameter toward the inside in the radial direction from the outside in the axial direction toward the inside.
The bottom wall part located inside the radial direction in the said panel part is formed in the longitudinal cross-sectional shape along an axial direction in the flat surface, The bottle characterized by the above-mentioned.

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