JP6335736B2 - Bottle - Google Patents

Description

  The present invention relates to a bottle.

  Conventionally, as a bottle with a bottomed cylindrical shape made of synthetic resin material, the bottom wall of the bottom is connected to the grounding part located on the outer peripheral edge and the grounding part from the inside in the radial direction, and the inside of the bottle axial direction The structure provided with the depression part which dents toward is known. Further, for example, Patent Document 1 discloses a configuration in which ribs protruding outward in the bottle axial direction are arranged at intervals in the circumferential direction in order to improve the rigidity of the depressed portion. Such a bottle is formed by biaxially stretching blow-molding a bottomed cylindrical preform.

US Pat. No. 4,108,324

  However, the conventional bottle described above still has room for improvement in terms of improving the rigidity of the depression. Specifically, with conventional bottles, when the thickness of the depressed portion becomes thinner as the weight is reduced, a portion of the depressed portion deforms toward the outside in the bottle axial direction when the contents are filled or when the internal pressure of the bottle increases. There was a risk. In this case, a so-called bottom drop is likely to occur in which the depressed portion reaches the arrangement position of the grounding portion or protrudes outward in the bottle axial direction from the grounding portion.

  Therefore, the present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a bottle that can suppress the occurrence of bottom falling by suppressing deformation of the depressed portion toward the outside in the bottle axial direction. It is to be.

In order to solve the above problems, the present invention proposes the following means.
The bottle according to the present invention is a bottle made of a synthetic resin material in which a mouth portion, a shoulder portion, a body portion, and a bottom portion are connected in this order, and the bottom wall portion of the bottom portion is a ground contact located at an outer peripheral edge portion. And a recessed portion that is continuous with the grounding portion from the inner side in the radial direction and that is recessed toward the inner side in the bottle axis direction. The recessed portion is arranged at intervals in the circumferential direction around the bottle axis. is set Rutotomoni, a plurality of outer ribs recessed toward the inside of the bottle axis direction with respect to the recess, the inner side in the radial direction from the outer ribs are disposed at intervals in the circumferential direction Rutotomoni An inner rib protruding outward in the bottle axial direction with respect to the depressed portion , and the circumferential and radial positions of the plurality of outer ribs and the plurality of inner ribs are different from each other. It is characterized by being.

With such a feature, the inner rib is disposed radially inward with respect to the outer rib, and the circumferential positions of the inner rib and the outer rib are different from each other. It can improve uniformly over the whole direction and radial direction. Thereby, the deformation | transformation toward the outer side of the bottle axial direction of a depression part can be suppressed, and generation | occurrence | production of a bottom fall can be suppressed.
In addition, since the outer ribs and the inner ribs are spaced apart from each other in the circumferential direction, it is possible to suppress the depression from being deformed toward the outer side in the bottle axial direction starting from the outer ribs and the inner ribs.

Moreover , since the outer rib is recessed toward the inner side in the bottle axial direction with respect to the depressed portion, the rigidity of the outer peripheral portion of the depressed portion can be effectively increased. That is, when the depressed portion attempts to deform toward the outside in the bottle axial direction, a compressive force is applied to the outer rib by attempting to deform in the direction in which the outer rib is reversely deformed. Thereby, in the outer rib, a reaction force (restoring force) directed inward in the bottle axial direction is increased, and deformation of the depressed portion toward the outer side in the bottle axial direction can be suppressed.
Moreover, since the inner rib protrudes toward the outside in the bottle axial direction with respect to the depressed portion, for example, when the bottle is formed by biaxial stretch blow molding, the amount of stretching of the inner peripheral portion of the depressed portion is increased, The heat resistance of the inner peripheral portion can be improved.
Thereby, the rigidity of the whole depression part can be improved and the deformation | transformation toward the outer side of the bottle axial direction of the whole depression part can be suppressed effectively.

The depressed portion includes a lower step wall portion provided radially inward from the ground contact portion, and a cylindrical upper step wall portion extending inward in the bottle axial direction from the inner periphery of the lower step wall portion. The inner rib may be disposed on the upper wall portion side, and the outer rib may be disposed on the lower wall portion side.
In this case, since the outer rib and the inner rib are securely arranged at different positions in the radial direction, the stress acting on the depressed portion is prevented from propagating between the outer rib and the inner rib, and the depressed portion Can be reliably suppressed from being deformed toward the outside in the bottle axial direction.

  According to the bottle according to the present invention, it is possible to suppress the occurrence of bottoming by suppressing the deformation of the depressed portion toward the outside in the bottle axial direction.

It is a side view of the bottle in the embodiment of the present invention. It is a top view of the bottom part of the bottle in embodiment of this invention. It is sectional drawing which follows the III-III line of FIG.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the bottle 1 of this embodiment includes a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14, and these 11 to 14 position their central axes on a common axis. In this state, the schematic configuration is arranged in this order.

  Hereinafter, the above-described common axis is referred to as the bottle axis O, the mouth 11 side is referred to as the upper side, and the bottom 14 side is referred to as the lower side along the bottle axis O direction. A direction perpendicular to the axis O is referred to as a radial direction, and a direction around the bottle axis O is referred to as a circumferential direction. In addition, the bottle 1 of this embodiment is formed by carrying out biaxial stretch blow molding of the preform formed integrally with a synthetic resin material, for example, and formed into a bottomed cylindrical shape by injection molding. Further, a cap (not shown) is attached to the mouth portion 11. Further, each of the mouth portion 11, the shoulder portion 12, the trunk portion 13, and the bottom portion 14 has a circular cross-sectional view shape along the radial direction.

The bottom part 14 is formed in a bottomed cylindrical shape, the heel part 17 whose upper end opening is connected to the lower end opening part of the body part 13, the lower end opening part of the heel part 17 is closed, and the outer peripheral edge part is a grounding part. 18 and a bottom wall portion 19.
The heel portion 17 is the maximum outer diameter portion of the bottle 1. The heel portion 17 is formed with a plurality of circumferential grooves 21 that are recessed inward in the radial direction and that extend continuously over the entire circumference in the bottle axis O direction.

  As shown in FIGS. 1 and 2, the body portion 13 is formed in a cylindrical shape, is continuous with the lower end of the shoulder portion 12, and extends downward. Both end portions of the body portion 13 in the bottle axis O direction constitute the first peripheral belt portion 22 and the second peripheral belt portion 23 that are the maximum outer diameter portion of the bottle 1 together with the heel portion 17 described above. In addition, each circumferential belt part 22 and 23 is made into the smooth surface extended over the perimeter of the circumferential direction. The body portion 13 is connected to the shoulder portion 12 via the first peripheral belt portion 22 and is connected to the heel portion 17 via the second peripheral belt portion 23.

  In the middle portion of the body portion 13 in the bottle axis O direction (portion located between each of the peripheral belt portions 22 and 23), a panel portion 31 for absorbing vacuum that is recessed toward the inside in the radial direction is spaced apart in the circumferential direction. A plurality of gaps are formed. And in the trunk | drum 13, the part located between the panel parts 31 adjacent in the circumferential direction comprises the pillar part 32 extended along the bottle axis | shaft O direction. That is, the panel portion 31 and the column portion 32 are alternately arranged in the circumferential direction on the body portion 13. In addition, the panel part 31 is extended over the whole region of the bottle axis | shaft O direction in the intermediate part of the trunk | drum 13. As shown in FIG.

The panel portion 31 includes a panel bottom wall portion 33 located radially inside the outer peripheral surface of the body portion 13, a side wall portion 34 extending from the outer periphery of the panel bottom wall portion 33 toward the radially outer side, It is defined by.
The column part 32 is formed so that a cross-sectional view shape orthogonal to the bottle axis O is a rectangular shape (trapezoidal shape). In the column part 32, the top part 32a located on the outer side in the radial direction has a curved shape protruding toward the outer side in the radial direction, and connects the outer peripheral edges of the side wall parts 34 of the panel parts 31 adjacent in the circumferential direction. Yes.

  Here, as shown in FIGS. 2 and 3, the bottom wall portion 19 of the bottom portion 14 described above is connected to the above-described grounding portion 18 and the grounding portion 18 from the inside in the radial direction, and toward the inside in the bottle axis O direction. And a depressed portion 41 that is depressed.

  The depressed portion 41 has a crested cylindrical shape and is arranged coaxially with the bottle axis O. Specifically, the depressed portion 41 includes an annular lower step wall portion 42 projecting radially inward from the ground contact portion 18, and a cylindrical upper step wall extending upward from the inner periphery of the lower step wall portion 42. A top wall portion 44 that closes the upper end opening of the upper wall portion 43.

The lower wall portion 42 is gradually inclined upward as it goes inward in the radial direction.
The upper step wall portion 43 has a circular cross-sectional shape orthogonal to the bottle axis O, and gradually decreases in diameter as it goes upward. The connecting portion 47 between the lower step wall portion 42 and the upper step wall portion 43 is a curved surface protruding downward.
The top wall portion 44 has a disk shape that is arranged coaxially with the bottle axis O, and the outer peripheral edge thereof is connected to the upper end opening edge of the upper stage wall portion 43. In addition, the connection part 48 of the upper stage wall part 43 and the top wall part 44 is a curved surface which protrudes upwards.

  The depressed portion 41 includes a plurality of outer ribs 51 arranged at intervals in the circumferential direction at the outer peripheral portion, and an inner side arranged at intervals in the circumferential direction on the radially inner side of the outer ribs 51. Ribs 52 are formed. The outer ribs 51 and the inner ribs 52 are arranged so that their positions in the circumferential direction are different from each other. That is, the outer ribs 51 and the inner ribs 52 are alternately arranged in the circumferential direction. In the present embodiment, the circumferential distance (arrangement pitch) between the adjacent outer ribs 51 and the inner ribs 52 is equal to each other. Of the ribs 51 and 52, the other rib is disposed at the center of the arrangement pitch of one rib.

  The outer rib 51 is recessed upward with respect to the depressed portion 41 and has a groove shape extending in the radial direction, and a connecting portion 47 between the lower step wall portion 42 and the upper step wall portion 43 of the depressed portion 41 is formed. It is formed to straddle. That is, the outer rib 51 has a radially outer end that terminates in the lower step wall portion 42 and a radially inner end that ends in the upper step wall portion 43. The outer rib 51 is gradually deeper with respect to the surface of the depression 41 as it goes from both ends in the radial direction toward the center. In this case, the outer rib 51 has the maximum depth in the central portion in the radial direction (portion located in the vicinity of the connecting portion 47). In the present embodiment, it is preferable that the maximum depth of the outer rib 51 is set to 0.8 mm or more and 4.0 mm or less.

  Further, the outer rib 51 has a rectangular shape in a plan view as viewed from the bottle axis O direction, and the width in the circumferential direction gradually increases from the both ends in the radial direction toward the center. Of the inner surface of the outer rib 51, the top 51 a positioned above has a uniform circumferential width over the entire radial direction, and both end portions in the radial direction are the lower step wall portion 42 and the upper step wall portion 43. Each is connected smoothly. In addition, among the inner surfaces of the outer ribs 51, the pair of connecting portions 51 b that connect both end edges in the circumferential direction of the top portion 51 a and the recessed portions 41 are gradually inclined toward the outer side in the circumferential direction as going downward. Therefore, the longitudinal cross-sectional view shape along the bottle axis O direction in the outer rib 51 is a trapezoid whose width in the circumferential direction gradually decreases as it goes upward.

  The inner rib 52 has a dome shape that bulges downward with respect to the surface of the depressed portion 41, and is formed so as to straddle the connecting portion 48 between the upper wall portion 43 and the top wall portion 44 in the depressed portion 41. Has been. Specifically, the inner rib 52 has an elliptical shape in which the radial direction is the major axis direction in a plan view as viewed from the bottle axis O direction, and the bulging amount with respect to the depressed portion 41 gradually increases toward the center. . It should be noted that the inner rib 52 has a smaller planar view outer shape as viewed from the bottle axis O direction than the outer rib 51 described above. In the illustrated example, the width of the inner rib 52 in the circumferential direction is narrower than that of the outer rib 51.

  In the illustrated example, the radial outer end of the inner rib 52 substantially coincides with the radial inner end of the outer rib 51 described above. However, the radially outer end of the inner rib 52 may be positioned on the radially outer side with respect to the radially inner end of the outer rib 51 or may be positioned on the radially inner side.

According to the bottle 1 configured in this manner, the inner rib 52 is disposed radially inward of the outer rib 51, and the circumferential positions of the inner rib 52 and the outer rib 51 are different from each other. Therefore, the rigidity of the bottom wall part 19 can be improved uniformly over the entire region in the circumferential direction and the radial direction. Thereby, the deformation | transformation toward the downward direction of the depression 41 can be suppressed, and generation | occurrence | production of a bottom fall can be suppressed.
In addition, since the outer rib 51 and the inner rib 52 are spaced apart from each other in the circumferential direction, the depressed portion 41 can be prevented from being deformed downward from the outer rib 51 and the inner rib 52. .

Further, since the outer rib 51 is recessed upward with respect to the depressed portion 41, the rigidity of the outer peripheral portion of the depressed portion 41 can be effectively increased. That is, when the depressed portion 41 is to be deformed downward, a compressive force is applied to the outer rib 51 by attempting to deform in the direction in which the outer rib 51 is reversely deformed. Thereby, in the outer rib 51, the reaction force (restoring force) directed upward is increased, and the deformation directed downward of the depressed portion 41 can be suppressed.
Furthermore, since the inner rib 52 protrudes downward with respect to the depressed portion 41, the extension amount of the inner peripheral portion of the depressed portion 41 can be increased, and the heat resistance of the inner peripheral portion can be improved.
Thereby, the rigidity of the whole depression part 41 can be improved and the deformation | transformation toward the downward direction of the whole depression part 41 can be suppressed effectively.

  In the present embodiment, the outer rib 51 is disposed on the lower wall portion 42 side and the inner rib 52 is disposed on the upper wall portion 43 side of the depressed portion 41. 52 will be reliably arrange | positioned in a mutually different position in radial direction. Therefore, it can suppress that the stress which acted on the depression part 41 propagates between the outer side rib 51 and the inner side rib 52, and can suppress reliably that the depression part 41 deform | transforms below.

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, in the above-described embodiment, the inner rib 52 protrudes toward the outside in the bottle axis O direction with respect to the depressed portion 41, and the outer rib 51 is depressed toward the inner side in the bottle axis O direction with respect to the depressed portion 41. However, the present invention is not limited to this. That is, the inner rib 52 may be recessed upward with respect to the depressed portion 41, and the outer rib 51 may protrude downward with respect to the depressed portion 41. Further, both the outer rib 51 and the inner rib 52 may be recessed upward, or may protrude downward.

In the above-described embodiment, the cross-sectional view shape along the radial direction of each of the shoulder portion 12, the trunk portion 13, and the bottom portion 14 is a circular shape, but is not limited thereto, and is, for example, an elliptical shape or a polygonal shape. You may change suitably.
Furthermore, in the embodiment described above, the configuration in which the outer rib 51 and the inner rib 52 are formed at positions that respectively straddle the connection portions 47 and 48 in the depressed portion 41 is not limited thereto. That is, if the inner rib 52 is disposed radially inward with respect to the outer rib 51, the positions of the outer rib 51 and the inner rib 52 can be appropriately changed in design.

Furthermore, although the above-described embodiment has described the configuration in which the other rib is disposed at the center of the arrangement pitch of the one rib, the present invention is not limited to this. It suffices if the circumferential positions of the outer rib 51 and the inner rib 52 are different from each other.
In addition, the shape and number of the outer ribs 51 and the inner ribs 52 can be appropriately changed.

The synthetic resin material forming the bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, polyolefin, 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, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the well-known component, and you may combine the said modification suitably.

DESCRIPTION OF SYMBOLS 1 ... Bottle 11 ... Mouth part 12 ... Shoulder part 13 ... Trunk part 14 ... Bottom part 19 ... Bottom wall part 41 ... Depression part 51 ... Outer rib 52 ... Inner rib

Claims (2)

It is a bottle made of a synthetic resin material in which the mouth, shoulder, trunk, and bottom are arranged in this order,
The bottom wall of the bottom is
A grounding portion located at the outer periphery,
Continuing from the inner side in the radial direction to the grounding part, comprising a depressed part that is recessed toward the inner side in the bottle axial direction,
In the depression,
Rutotomoni disposed at intervals in the circumferential direction along the circumference bottle axis, and a plurality of outer ribs recessed toward the inside of the bottle axis direction with respect to the recess,
In inward in the radial direction than the outer ribs are disposed at intervals in the circumferential direction Rutotomoni, an inner rib which projects towards the outside of the bottle axis direction with respect to the recess, is formed,
The plurality of outer ribs and the plurality of inner ribs are different from each other in circumferential and radial positions. The depression is
A lower wall portion provided radially inward from the grounding portion;
A cylindrical upper wall portion extending from the inner peripheral edge of the lower wall portion toward the inner side in the bottle axial direction,
The bottle according to claim 1, wherein the inner rib is disposed on the upper wall portion side, and the outer rib is disposed on the lower wall portion side.

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