bottle

Abstract

To suppress deformation of a grounding part.SOLUTION: A bottomed cylindrical bottle 1 is formed of a synthetic resin material, wherein a bottom part 14 includes: a bottom wall part 19 where a grounding part 18 is located in an outer peripheral edge part; and a cylindrical heel part 17 extending upward from an outer peripheral edge of the grounding part. The heel part is formed in a projecting curved shape toward outside in a radial direction, a plurality of recesses 21 are arranged at intervals in a circumferential direction in the heel part, the recess has such a semicircular shape that an outer end edge 21a in the radial direction extends in the circumferential direction and protrudes toward inside in the radial direction from the outer end edge in the radial direction as viewed from the lower side, and a bottom surface 21b of the recess is separated from the grounding part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bottle.

Background Art

[0002] Conventionally, as a bottle formed in a bottomed cylindrical shape from a synthetic resin material, for example, as shown in Patent Document 1 below, the bottom portion includes a bottom wall portion where a grounding portion is located at the outer peripheral edge portion, and a cylindrical heel portion extending upward from the outer peripheral edge of the grounding portion. A configuration in which the heel portion is formed in a convex curved surface shape toward the outside in the radial direction is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional bottle, for example, when a large compressive load is applied in the vertical direction, or when high-temperature contents are filled, etc., the grounding portion may be deformed. This problem becomes apparent as the bottle is lightened.

[0005] An object of the present invention is to provide a bottle capable of suppressing deformation of the grounding portion.

Means for Solving the Problems

[0006] A bottle according to one aspect of the present invention is a bottomed cylindrical bottle made of a synthetic resin material, the bottom comprising a bottom wall portion with a contact portion located at its outer peripheral edge, and a cylindrical heel portion extending upward from the outer peripheral edge of the contact portion, wherein the heel portion is formed in a curved shape that protrudes radially outward, and a plurality of recesses are arranged in the heel portion at circumferential intervals, the recesses having a semicircular shape when viewed from below, with the radial outer edge extending circumferentially and protruding radially inward from the radial outer edge, and the bottom surface of the recesses is separated from the contact portion The radial outer edge of the recess is located on a parting line that extends continuously along the entire length in the circumferential direction. .

[0007] According to the above embodiment, since a plurality of recesses are arranged at circumferential intervals on the heel portion extending upward from the outer edge of the contact portion, it is possible to improve the rigidity of the contact portion, and deformation of the contact portion can be suppressed, for example, when a large compressive load is applied in the vertical direction or when it is filled with high-temperature contents. When viewed from below, the recess has a semicircular shape with its radial outer edge extending circumferentially and protruding radially inward from the radial outer edge. Therefore, the radial inner end of the recess closest to the ground surface becomes a semicircular apex, making it easier to separate the rest of the recess from the ground surface radially outward. Consequently, compared to, for example, a rectangular recess that is rectangular when viewed from below and has its radial inner edge extending circumferentially, the presence of the recess can suppress the difficulty in accurately forming the ground surface. Since the recess exhibits a semicircular shape as described above when viewed from below, it is possible to reduce the corner portion compared to the rectangular recess, making it less likely for areas to become excessively stretched and locally thinned during blow molding to occur. Since the recess exhibits a semicircular shape when viewed from below, as if the radially outer portion has been cut off, it becomes easier to concentrate and improve the rigidity of the radially inner end portion of the heel adjacent to the contact point compared to, for example, a circular recess when viewed from below, thereby reliably improving the rigidity of the contact point. Since the bottom surface of the recess is separated from the contact surface, the difficulty in ensuring ground stability due to the presence of the recess can be mitigated.

[0009] Since the radial outer edge of the recess is located on a parting line that extends continuously along the entire length in the circumferential direction, a bottle with excellent mold release properties can be obtained. [Effects of the Invention]

[0010] According to the above embodiment of the present invention, deformation of the ground contact portion can be suppressed. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side view of a bottle shown as one embodiment of the present invention. [Figure 2] Figure 1 is a bottom view of the bottle. [Modes for carrying out the invention]

[0012] A bottle according to one embodiment of the present invention will be described below with reference to the drawings. As shown in Figures 1 and 2, the bottle 1 according to this embodiment comprises a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14, and these 11 to 14 are arranged in this order with their respective central axes positioned on a common axis.

[0013] Hereinafter, the common axis will be referred to as the bottle axis O, the side with the mouth 11 will be referred to as the upper side and the side with the bottom 14 as the lower side along the direction of the bottle axis O, the direction along the bottle axis O will be referred to as the vertical direction, the direction that intersects the bottle axis O when viewed from the vertical direction will be referred to as the radial direction, and the direction that circles around the bottle axis O when viewed from the vertical direction will be referred to as the circumferential direction. Bottle 1 is formed from a preform that has been injection-molded into a bottomed cylindrical shape, which is then blow-molded and integrally formed from a synthetic resin material. The mouth portion 11, shoulder portion 12, body portion 13, and bottom portion 14 each have a circular cross-sectional shape perpendicular to the bottle axis O.

[0014] A male threaded portion is formed on the outer circumferential surface of the opening 11, to which a cap (not shown) is screwed. A neck ring 11a is formed in the portion of the opening 11 located below the male threaded portion, projecting radially outward and extending continuously along its entire circumferential length. The outer circumferential surface of the lower end of the opening 11, located below the neck ring 11a, is a smooth surface.

[0015] The body portion 13 has multiple panel portions 13a that are elongated in the vertical direction when viewed from the radial direction, and these are formed at intervals in the circumferential direction. In the body portion 13, an annular groove 15 is formed at the lower end located below the panel portions 13a, extending continuously along the entire length in the circumferential direction. The annular groove 15 may be formed in a portion of the body portion 13 other than the lower end.

[0016] The bottom portion 14 comprises a bottom wall portion 19 on which the ground contact portion 18 is located at its outer peripheral edge, and a cylindrical heel portion 17 extending upward from the outer peripheral edge 18a of the ground contact portion 18. The heel portion 17 is formed in a curved shape that protrudes radially outward. The upper end opening edge of the heel portion 17 is connected to the 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 18a of the ground contact portion 18. In the bottom wall portion 19, the portion located radially inward from the ground contact portion 18 is a recessed portion 16 that is indented upward. Note that the bottom wall portion 19 does not necessarily have to have a recessed portion 16.

[0017] Bottle 1 is formed by a body mold divided into multiple sections around the bottle axis O, and a bottom mold that moves closer to and further away from the body mold in the vertical direction. The outer surface of Bottle 1 is provided with a parting line (not shown) extending in the vertical direction, formed by the mating surface of the body mold, and a parting line L1 extending in the circumferential direction, formed by the mating surface of the body mold and the bottom mold. The parting line L1 is located at the heel portion 17 and extends continuously along the entire length in the circumferential direction.

[0018] In this embodiment, a plurality (24 in the illustrated example) of recesses 21 are arranged at intervals in the circumferential direction on the heel portion 17. The recesses 21 are provided at equal intervals in the circumferential direction. The recesses 21 open obliquely downward toward the outer side in the radial direction. When viewed from below, the radially outer edge 21a of the recess 21 extends in the circumferential direction and has a semi-circular shape that projects inward in the radial direction from the radially outer edge 21a. The circumferential size of the recess 21 becomes shorter as it goes from the outer side to the inner side in the radial direction when viewed from below.

[0019] The radially outer edge 21a of the recess 21 extends straight in the circumferential direction. The radially outer edge 21a of the recess 21 is located on the same arc centered on the bottle axis O. The radially outer edge 21a of the recess 21 is located on the parting line L1. Note that the radially outer edge 21a of the recess 21 may be separated from the parting line L1. For example, the parting line L1 may intersect the recess 21.

[0020] The length of the radially outer edge 21a of the recess 21 is longer than the interval between the radially outer edges 21a of the recesses 21 adjacent to each other in the circumferential direction and shorter than the interval between the radially inner ends of the recesses 21 adjacent to each other in the circumferential direction. The length of the radially outer edge 21a of the recess 21 is longer than the radial size of the recess 21 when viewed from below.

[0021] The bottom surface 21b of the recess 21 is separated from the grounding portion 18. The bottom surface 21b of the recess 21 is separated upward from the grounding portion 18. The bottom surface 21b of the recess 21 is separated outward in the radial direction from the grounding portion 18. The radially inner end of the recess 21 is externally tangent to the outer peripheral edge 18a of the grounding portion 18. Note that the radial positions of the bottom surface 21b of the recess 21 and the grounding portion 18 may be the same as each other. The radially inner end of the recess 21 may be separated outward in the radial direction from the outer peripheral edge 18a of the grounding portion 18. The recess 21 has a side surface 21c that rises from the outer peripheral edge of the bottom surface 21b and is connected to the outer surface of the bottom portion 14.

[0022] As described above, in the bottle 1 according to this embodiment, a plurality of recesses 21 are arranged at circumferential intervals on the heel portion 17 that extends upward from the outer peripheral edge 18a of the contact portion 18. This makes it possible to improve the rigidity of the contact portion 18, and for example, when a large compressive load is applied in the vertical direction, or when it is filled with high-temperature contents, deformation of the contact portion 18 can be suppressed.

[0023] Since the recess 21, when viewed from below, has a semicircular shape with its radial outer edge 21a extending circumferentially and protruding radially inward from the radial outer edge 21a, the radial inner end of the recess 21 closest to the ground contact portion 18 becomes the semicircular apex, making it easier to separate the portion of the recess 21 other than the semicircular apex radially outward from the ground contact portion 18. Therefore, compared to, for example, a rectangular recess that is rectangular when viewed from below and has its radial inner edge extending circumferentially, the presence of the recess 21 can suppress the difficulty in accurately molding the ground contact portion 18.

[0024] Since the recess 21 exhibits the semicircular shape described above when viewed from below, it is possible to reduce the corner portion compared to the rectangular recess, making it less likely for areas to become excessively stretched and locally thinned during blow molding to occur. Since the recess 21 has a semicircular shape when viewed from below, with the radially outer portion removed, it becomes easier to concentrate on improving the rigidity of the radially inner end of the heel portion 17 adjacent to the ground contact portion 18, compared to a recess that has a circular shape when viewed from below, for example, and thus the rigidity of the ground contact portion 18 can be reliably improved.

[0025] Since the bottom surface 21b of the recess 21 is separated from the ground contact portion 18, the presence of the recess 21 can suppress the difficulty in ensuring ground contact stability.

[0026] Since the radial outer edge 21a of the recess 21 is located on the parting line L1 that extends continuously along the entire length in the circumferential direction, a bottle 1 with excellent mold release properties can be obtained.

[0027] Furthermore, the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0028] The synthetic resin material forming bottle 1 may be changed as appropriate, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend thereof. Bottle 1 is not limited to a single-layer structure; it may also be a laminated structure having an intermediate layer. Examples of this intermediate layer include a layer made of a resin material having gas barrier properties, a layer made of recycled material, or a layer made of a resin material having oxygen-absorbing properties. In the above embodiment, the cross-sectional shapes of the mouth portion 11, shoulder portion 12, body portion 13, and bottom portion 14 perpendicular to the bottle axis O are circular, but the embodiment is not limited to this and may be modified as appropriate, for example, by making them angular.

[0029] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above modifications may be combined as appropriate. [Explanation of Symbols]

[0030] 1 bottle 14 Bottom 17 Heel section 18 Grounding part 19 Bottom wall section 21 Recess 21a Outer edge 21b Bottom L1 Parting Line

Claims

[Claim 1] A bottomed cylindrical bottle made of synthetic resin material, The bottom portion comprises a bottom wall portion with a contact point located at its outer edge, and a cylindrical heel portion extending upward from the outer edge of the contact point. The heel portion is formed in a curved shape that protrudes radially outward, Multiple recesses are arranged in the heel portion at intervals in the circumferential direction. The recess, when viewed from below, has a semicircular shape in which the radial outer edge extends circumferentially and protrudes radially inward from the radial outer edge. The bottom surface of the recess is separated from the contact portion. The radial outer edge of the recess is located on a parting line that extends continuously along the entire length in the circumferential direction, in a bottle.

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