Square bottle

Abstract

To suppress breakage at a portion located between a decompression absorption panel portion and a peripheral groove even if the weight is reduced.SOLUTION: A square bottle according to the present invention has a body part 4 in which multiple panel face parts 10 are continuously provided in the circumferential direction, a circumferential groove 13 extending in the circumferential direction and dividing the panel face parts vertically is formed in the body part, a decompression absorption panel part 22 vertically adjacent to the circumferential groove is formed in the panel face part, the decompression absorption panel part has a square shape having a plurality of corner parts 22a when viewed in front face from the outside in the radial direction, a corresponding portion 10a located between a corresponding corner part adjacent to the circumferential groove in the vertical direction, of the corner parts in the decompression absorption panel part, and the circumferential groove is formed with an overhanging portion 30 extending toward the inside of the circumferential groove in the panel face parts, and a lateral groove 31 extending in the circumferential direction across the central portion in the circumferential direction is formed at a portion located between the circumferential groove and the decompression absorption panel part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a square bottle. [Background technology]

[0002] For example, as shown in Patent Document 1 below, a rectangular bottle is known which has a body portion having a plurality of panel surface portions arranged circumferentially, a circumferential groove extending in the body portion is formed which divides the panel surface portion into upper and lower portions, and vacuum absorption panel portions are formed in the panel surface portions which are adjacent to the circumferential groove in the vertical direction, and the vacuum absorption panel portions have an angular shape having a plurality of corners when viewed from the front from the outside in the radial direction, and a protrusion portion is formed in the panel surface portion which protrudes toward the inside of the circumferential groove at a portion of the plurality of corners of the vacuum absorption panel portions which is located between the circumferential groove and a corresponding corner adjacent to the circumferential groove in the vertical direction. In this rectangular bottle, the overhanging portion ensures a large plane area for the corresponding portion located between the corresponding corner portion and the circumferential groove, and this can reduce stress that occurs in the corresponding portion when the vacuum absorption panel portion deforms due to the reduction in pressure inside the rectangular bottle. This makes it possible to prevent the corresponding portion from being folded in a valley shape toward the inside of the bottle when the pressure inside the rectangular bottle is reduced. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-70493 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when an attempt is made to reduce the weight (thinning) of a rectangular bottle, there is a risk that the above-mentioned folds will become more likely to occur in the portion between the vacuum absorption panel portion and the circumferential groove, at a position that is shifted from the corresponding portion toward the center of the vacuum absorption panel portion in the circumferential direction.

[0005] The present invention provides a square bottle which is lightweight and yet can prevent bending of the portion located between a vacuum absorption panel portion and a circumferential groove. [Means for solving the problem]

[0006] A rectangular bottle according to one embodiment of the present invention has a body portion having a plurality of panel surface portions arranged circumferentially, the body portion having a circumferential groove extending in the circumferential direction and dividing the panel surface portion into upper and lower portions, the panel surface portion having vacuum absorption panel portions formed therein adjacent to the circumferential groove in the vertical direction, the vacuum absorption panel portions having an angular shape having a plurality of corners when viewed from the outside in the radial direction, the panel surface portion having a corresponding portion between the circumferential groove and a corresponding corner adjacent to the circumferential groove in the vertical direction among the plurality of corners of the vacuum absorption panel portion, the corresponding portion of the panel surface portion being located between the circumferential groove and the corresponding corner being located adjacent to the circumferential groove in the vertical direction is formed with a protruding portion protruding towards the inside of the circumferential groove, and a horizontal groove is formed in the portion located between the circumferential groove and the vacuum absorption panel portion and extending in the circumferential direction across the circumferential center of this portion.

[0007] The protruding portion ensures a large plane area for the corresponding portion located between the corresponding corner portion and the circumferential groove, which relieves stress generated in the corresponding portion when the vacuum absorption panel portion deforms due to reduced pressure inside the rectangular bottle and prevents the corresponding portion from bending in a valley-like manner toward the inside of the bottle. In the panel surface portion, a horizontal groove is formed in the band-shaped portion located between the circumferential groove and the vacuum absorption panel portion, extending circumferentially across the circumferential center of the band-shaped portion. This makes it possible to improve the rigidity of the band-shaped portion and suppresses bending of parts of the band-shaped portion other than the corresponding parts when the pressure inside the square bottle is reduced, even if the weight of the square bottle is reduced.

[0008] The panel surface portion, the lateral groove and the vacuum absorption panel portion may have circumferential central portions aligned with each other, and the circumferential size of the lateral groove may be smaller than the circumferential size of the vacuum absorption panel portion.

[0009] Since the circumferential centres of the panel surface portion, the lateral groove and the vacuum absorption panel portion are aligned and the circumferential size of the lateral groove is smaller than the circumferential size of the vacuum absorption panel portion, it is possible to ensure the rigidity of the band-like portion located between the circumferential groove and the vacuum absorption panel portion while ensuring the planar area of ​​the corresponding portion located between the corresponding corner portion and the circumferential groove. This makes it possible to reliably prevent the band-like portion from bending even when the weight of the rectangular bottle is reduced.

[0010] The vacuum absorption panel portion may have a rectangular shape with R-shaped corners at its four corners when viewed from the radial outside, and two of the corresponding corners may be arranged circumferentially spaced apart, and at each of the two corresponding corners, the circumferential distance between the centers of the outer circumferential edges which have an arc shape when viewed from the front may be greater than or equal to the circumferential size of the lateral groove.

[0011] At each of the two corresponding corners, the circumferential distance between the central portions of the outer peripheral edges which form an arc shape when viewed from the front is equal to or greater than the circumferential size of the lateral groove. This makes it possible to ensure the planar area of ​​the corresponding portion between the corresponding corners and the circumferential groove while also ensuring the rigidity of the band-shaped portion between the circumferential groove and the vacuum absorption panel portion. This makes it possible to reliably prevent the band-shaped portion from breaking even when the weight of the rectangular bottle is reduced. Effect of the Invention

[0012] According to one aspect of the present invention, even when weight reduction is attempted, the occurrence of valley folds, in which the bottle is bent toward the inside, in the portion located between the vacuum absorption panel portion and the circumferential groove can be suppressed. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a side view of a square bottle shown as one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of a square bottle according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the square bottle 1 of this embodiment comprises a mouth portion 2, a shoulder portion 3, a body portion 4 and a bottom portion 5, which are connected together in this order with their respective central axes positioned on a common axis. Hereinafter, the common axis will be referred to as the bottle axis O, the mouth 2 side along the bottle axis O direction will be referred to as the upper side, the bottom 5 side along the bottle axis O direction will be referred to as the lower side, and the bottle axis O direction will be referred to as the up-down direction. The direction intersecting the bottle axis O when viewed from the up-down direction will be referred to as the radial direction, and the direction going around the bottle axis O when viewed from the up-down direction will be referred to as the circumferential direction.

[0015] The square bottle 1 is made of a synthetic resin material and is obtained by blow molding a test-tube shaped preform formed by injection molding. Examples of synthetic resin materials that form the square bottle 1 include polyethylene, polypropylene, polyethylene terephthalate (PET), polyethylene naphthalate, amorphous polyester, and blends of these. However, the synthetic resin material is not limited to one type, and the square bottle 1 may be formed by laminating different types of synthetic resin materials.

[0016] The mouth portion 2 is formed in a cylindrical shape, and a cap (not shown) is removably attached to the mouth portion 2. The body 4 is configured with panel surface portions 10 and corner surface portions 11 alternately arranged in the circumferential direction, and is formed into a cross-sectional shape. In the illustrated example, the body 4 has four panel surface portions 10 and four corner surface portions 11, and the panel surface portions 10 face each other in the radial direction, and the corner surface portions 11 face each other in the radial direction. The shoulder portion 3 is also formed into a cross-sectional shape similar to that of the body 4.

[0017] The circumferential size of the panel surface portion 10 is larger than the circumferential size of the corner surface portion 11. The circumferential sizes of the four panel surface portions 10 are equal to each other. The body portion 4 may be formed in a flat shape in cross section. The panel surface portions 10 and the corner surface portions 11 adjacent to each other in the circumferential direction are connected in the circumferential direction via ridge portions 12 extending in the vertical direction. The ridge portions 12 are disposed over the entire length of the body portion 4 in the vertical direction.

[0018] The body portion 4 is formed with a circumferential groove 13 that extends in the circumferential direction and divides the panel surface portion 10 into upper and lower portions. In the illustrated example, the circumferential groove 13 is formed in the lower part of the body portion 4. In the panel surface portion 10, the upper panel surface portion 20 located above the circumferential groove 13 is larger in the vertical direction than the lower panel surface portion 21 located below the circumferential groove 13. Note that the circumferential groove 13 may be formed in, for example, the center part of the body portion 4 in the vertical direction. A plurality of circumferential grooves 13 are provided at intervals in the circumferential direction. Four circumferential grooves 13 are provided at equal intervals in the circumferential direction. The circumferential grooves 13 are provided around the entire circumference of the body portion 4 except for the central portion in the circumferential direction of the corner surface portion 11.

[0019] The panel surface portion 10 is formed with vacuum absorption panel portions 22 adjacent to the circumferential groove 13 in the vertical direction. In the illustrated example, the vacuum absorption panel portions 22 are provided on both sides of the circumferential groove 13 in the vertical direction, i.e., on the upper panel surface portion 20 and the lower panel surface portion 21, respectively. Hereinafter, the vacuum absorption panel portion 22 located on the upper panel surface portion 20 will be referred to as the first vacuum absorption panel portion 23, and the vacuum absorption panel portion 22 located on the lower panel surface portion 21 will be referred to as the second vacuum absorption panel portion 24.

[0020] The vacuum absorption panel section 22 has an angular shape having multiple corners 22a when viewed from the front in the radial direction. The vacuum absorption panel section 22 has a quadrangular shape with R-shaped corners 22a at the four corners when viewed from the front. The vacuum absorption panel section 22 has a rectangular shape that is long in the up-down direction when viewed from the front. The circumferential sizes of the first and second vacuum absorption panel sections 23 and 24 are equal to each other. The vertical size of the first vacuum absorption panel section 23 is larger than the vertical size of the second vacuum absorption panel section 24. The planar area of ​​the first vacuum absorption panel section 23 is larger than the planar area of ​​the second vacuum absorption panel section 24.

[0021] In the panel surface portion 10, among the multiple corners 22a in the vacuum absorption panel portion 22, a corresponding portion 10a located between the circumferential groove 13 and a corresponding corner 22a adjacent to the circumferential groove 13 in the up-down direction is formed with a protruding portion 30 that protrudes toward the inside of the circumferential groove 13. The protruding portion 30 narrows the groove width of the portion of the circumferential groove 13 adjacent to the corresponding corner 22a in the up-down direction. The aforementioned corresponding corners 22a are the two corners 22a located on the lower side and spaced apart in the circumferential direction among the four corners 22a that the first vacuum absorption panel portion 23 has, and the aforementioned corresponding portion 10a is located at the lower end portion of the upper panel surface portion 20.

[0022] Two overhanging portions 30 are provided at a distance in the circumferential direction corresponding to two lower corners 22a of the first vacuum absorption panel portion 23. An upper end face of the inner surface of the circumferential groove 13, which is located at the upper end and faces downward, extends upward as it moves away from the overhanging portions 30 in the circumferential direction. A portion of the upper end face of the circumferential groove 13, which is located between the overhanging portions 30, presents a curved shape recessed upward in the front view. In addition, the protrusion portion may have, for example, a semicircular, rectangular, or triangular shape that protrudes downward when viewed from the front, or a configuration in which the protrusion protrudes downward in multiple stages so that its circumferential size decreases stepwise downward.

[0023] A lateral groove 31 is formed in the circumferentially extending band portion 20b located between the circumferential groove 13 and the first vacuum absorption panel portion 23, and extends in the circumferential direction across the circumferential center of the band portion 20b. The circumferential centers of the panel surface portion 10, the lateral groove 31, the first vacuum absorption panel portion 23, and the second vacuum absorption panel portion 24 are aligned.

[0024] The inner surface of the circumferential groove 13 has an upper end surface facing downward, which extends upward as it moves radially outward. The inner surface of the circumferential groove 13 has a lower end surface facing upward, which extends substantially straight in the radial direction. A step having a step surface facing up or down may be provided at least one between the lateral groove 31 and the first vacuum absorption panel portion 23 and between the lateral groove 31 and the circumferential groove 13. Also, a step having a step surface (upper end surface) facing upward at the upper end of the body portion 4 may be formed, and the step surface of this step may be made to be flush with the lower end surface of the lateral groove 31 in the radial direction.

[0025] The vertical distance between the lateral groove 31 and the first vacuum absorption panel portion 23 is equal to or less than the vertical distance between the lateral groove 31 and the circumferential groove 13. The former distance may be greater than the latter distance. The circumferential size of the lateral groove 31 is smaller than the circumferential size of the first vacuum absorption panel portion 23. In each of the two corresponding corner portions 22a located on the lower side of the first vacuum absorption panel portion 23, the circumferential distance X between the centers of the outer circumferential edges having an arc shape in the front view is equal to or larger than the circumferential size of the lateral groove 31.

[0026] The apex (lower end) of the protruding portion 30 on the circumferential groove 13 side faces the corresponding corner 22a in the up-down direction. In the front view, a straight line L that passes through the apex of the protruding portion 30 and is tangent to the outer periphery of the corresponding corner 22a that faces the apex in the up-down direction is tangent to both circumferential ends of the lateral groove 31 or is separated in the circumferential direction. As the straight line L goes upward in the front view, it extends in a direction separating it from the circumferential center of the panel surface portion 10 in the circumferential direction.

[0027] As described above, in the rectangular bottle 1 of this embodiment, the protrusion 30 ensures a wide plane area for the corresponding portion 10a located between the corresponding corner portion 22a and the circumferential groove 13, which relieves stress generated in the corresponding portion 10a when the vacuum absorption panel portion 22 deforms due to reduced pressure inside the rectangular bottle 1 and prevents the corresponding portion 10a from bending in a valley-like manner toward the inside of the bottle.

[0028] In the panel surface portion 10, a horizontal groove 31 is formed in the band portion 20b located between the circumferential groove 13 and the first vacuum absorption panel portion 23, extending circumferentially across the circumferential center of the band portion 20b. This makes it possible to improve the rigidity of the band portion 20b. Even if the weight of the square bottle 1 is reduced, bending of the band portion 20b in parts other than the corresponding part 10a when the pressure inside the square bottle 1 is reduced can be suppressed.

[0029] The circumferential centres of the panel surface portion 10, the lateral groove 31 and the vacuum absorption panel portion 22 coincide with each other and the circumferential size of the lateral groove 31 is smaller than the circumferential size of the first vacuum absorption panel portion 23. This makes it possible to ensure the planar area of ​​the corresponding portion 10a located between the corresponding corner portion 22a and the circumferential groove 13 while also ensuring the rigidity of the band-like portion 20b located between the circumferential groove 13 and the first vacuum absorption panel portion 23. Even when the weight of the rectangular bottle 1 is reduced, the occurrence of bending in the band-like portion 20b can be reliably prevented.

[0030] At each of the two corresponding corners 22a, the circumferential distance X between the central portions of the outer circumferential edges which form an arc shape in a front view is equal to or greater than the circumferential size of the lateral groove 31. This makes it possible to ensure the planar area of ​​the corresponding portion 10a located between the corresponding corners 22a and the circumferential groove 13 while also ensuring the rigidity of the band-like portion 20b located between the circumferential groove 13 and the first vacuum absorption panel portion 23. Even when the weight of the rectangular bottle 1 is reduced, the band-like portion 20b can be reliably prevented from bending.

[0031] 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.

[0032] For example, the numbers of the four panel surface portions 10 and the corner surface portions 11 are not limited to four and may be changed as appropriate. The circumferential groove 13 may extend continuously around the entire circumference. The panel surface portion 10 may be provided with only one of the first vacuum absorption panel portion 23 and the second vacuum absorption panel portion 24 . The shape of each of the first vacuum absorption panel section 23 and the second vacuum absorption panel section 24 when viewed from the front is not limited to a quadrangular shape and may be appropriately changed as long as it is an angular shape having a plurality of corners 22a. Of the multiple corners 22a in the vacuum absorption panel portion 22, the corresponding corner 22a adjacent to the circumferential groove 13 in the up-down direction may be one. The protrusion portion 30 may be formed in a portion of the lower panel surface portion 21 that is located between two of the four corner portions 22a of the second vacuum absorption panel portion 24 that are located on the upper side and spaced apart in the circumferential direction (corresponding corner portions) 22a and the circumferential groove 13. The protruding portion 30 may be formed on both the upper panel surface portion 20 and the lower panel surface portion 21 .

[0033] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described embodiments and the above-described variations may be combined as appropriate. [Explanation of symbols]

[0034] 1 square bottle 4. Torso 10 Panel surface 10a Corresponding part 13 Circumferential groove 22 Vacuum absorption panel section 22a Corner, corresponding corner 30 Overhang 31 Yokomizo

Claims

1. A body portion in which a plurality of panel surface portions are arranged in a circumferential direction is provided, A circumferential groove is formed in the body portion, the circumferential groove extending in a circumferential direction and dividing the panel surface portion into upper and lower portions, The panel surface portion is formed with a vacuum absorption panel portion adjacent to the circumferential groove in the up-down direction, The vacuum absorption panel portion has a square shape having a plurality of corners when viewed from the outside in the radial direction, In the panel surface portion, a protruding portion protruding toward the inside of the circumferential groove is formed in a corresponding portion located between the circumferential groove and a corresponding corner portion adjacent to the circumferential groove in the up-down direction among the plurality of corner portions in the vacuum absorption panel portion, In the rectangular bottle, a horizontal groove is formed in a portion located between the circumferential groove and the vacuum absorption panel portion, the horizontal groove extending in the circumferential direction across a central portion in the circumferential direction of this portion.

2. The center portions of the panel surface portion, the lateral groove, and the vacuum absorption panel portion in the circumferential direction are aligned with each other, 2. The square bottle according to claim 1, wherein a circumferential size of the lateral groove is smaller than a circumferential size of the vacuum absorption panel portion.

3. The vacuum absorption panel portion has a rectangular shape with R-shaped corners at four corners when viewed from the outside in the radial direction, The corresponding corner portions are arranged in pairs at intervals in the circumferential direction, 3. The square bottle according to claim 2, wherein at each of the two corresponding corners, a circumferential distance between the central portions of the outer circumferential edges that are arc-shaped when viewed from the front is equal to or greater than a circumferential size of the lateral groove.

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