Decompression absorption bottle

Abstract

To allow a movable wall part to easily rotate upward when a bottle is decompressed.SOLUTION: Multiple dimples 31 are formed on a movable wall part 22 of a bottom wall part 19, first radial recesses 26 formed by the multiple dimples lined up in one direction X are arranged separately on both sides of a bottle axis O in the radial direction, and second radial recesses 27 formed by the multiple dimples lined up in the other direction Y are arranged separately on both sides of the bottle axis in the radial direction. The first radial recesses extend radially inward from both ends of the movable wall part in one direction, and the second radial recesses extend radially inward from both ends of the movable wall part in the other direction, and at both ends of the movable wall part in one direction, the dimples are lined up at least radially and circumferentially and arranged more densely than in other parts, and a pattern formed by the dimples when viewed from the bottom is symmetrical with respect to a first line L1 extending in one direction and is symmetrical with respect to a second line L2 extending in the other direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Conventionally, as shown in Patent Document 1 below, a vacuum absorption bottle formed into a cylindrical shape with a bottom from a synthetic resin material has been known in which the bottom wall portion of the bottom portion includes a grounding portion located on the outer periphery, a rising peripheral wall portion connected to the grounding portion from the inside in the radial direction and extending upward, and an annular movable wall portion extending radially inward from the upper end portion of the rising peripheral wall portion, and the movable wall portion rotates upward around the connection portion with the rising peripheral wall portion, thereby absorbing the reduced pressure inside the bottle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-7287 Summary of the Invention [Problem to be solved by the invention]

[0004] However, depending on the shape of the movable wall portion, it may become difficult for the movable wall portion to rotate upward around the connection portion when the pressure inside the bottle is reduced, and even when the amount of decrease in pressure inside the bottle (degree of pressure reduction) is small, there is room for improvement in terms of preferentially deforming the bottom and suppressing deformation of the body portion, etc.

[0005] The present invention provides a vacuum absorption bottle that allows a movable wall portion to be easily rotated upward about a connection portion with a rising peripheral wall portion when the pressure inside the bottle is reduced. [Means for solving the problem]

[0006] A vacuum absorption bottle according to one aspect of the present invention is a cylindrical vacuum absorption bottle with a bottom made of a synthetic resin material, the bottom wall of the bottle comprising a grounding portion located on an outer circumferential edge portion, a rising peripheral wall portion connected to the grounding portion from the inside in the radial direction and extending upward, and an annular movable wall portion extending from an upper end portion of the rising peripheral wall portion toward the inside in the radial direction, the movable wall portion is disposed so as to be rotatable in the vertical direction around a connection portion with the rising peripheral wall portion, the movable wall portion is formed with a plurality of dimples formed in a curved surface shape recessed toward the top, the plurality of dimples are arranged in a line along one of the radial directions to form first radial recesses, which are disposed separately on both sides of a bottle axis in the radial direction, and the plurality of dimples are arranged in a line along one of the radial directions to form first radial recesses. second radial recesses arranged along another direction perpendicular to the one direction are arranged separately on both sides of the bottle axis in the radial direction, the first radial recesses extend radially inward from both ends of the movable wall portion in the one direction, and the second radial recesses extend radially inward from both ends of the movable wall portion in the other direction, and at both ends of the movable wall portion in the one direction, a plurality of the dimples are arranged in at least radial and circumferential directions and are more densely packed than in other portions, and when viewed from the bottom, a pattern formed by the plurality of dimples is symmetrical with respect to a first line extending in the one direction and is symmetrical with respect to a second line extending in the other direction.

[0007] Since the movable wall portion is provided with a pair of first radial recesses and a pair of second radial recesses, the movable wall portion is divided into four panel surface portions circumferentially sandwiched between the first radial recesses and the second radial recesses, and when the pressure inside the vacuum absorption bottle is reduced (hereinafter referred to as when the pressure is reduced), each of the four panel surface portions can be rotated upwardly around the connection portion with the rising peripheral wall portion, making it easier to rotate the movable wall portion upwardly around the connection portion. In the movable wall portion, a plurality of dimples are arranged at both ends in the one direction, at least in the radial and circumferential directions, and are arranged more densely than in other parts, so that the thickness of both ends in the one direction of the movable wall portion is the thickest and the rigidity is the highest in the movable wall portion. Therefore, it is possible to generate parts in the four panel surface parts where stress is likely to concentrate during decompression and which become the starting point of the above-mentioned rotation, and it is possible to easily rotate the movable wall portion as described above. When viewed from the bottom, the pattern created by the multiple dimples is symmetrical with respect to the first line extending in the one direction, and is also symmetrical with respect to the second line extending in the other direction, so that when pressure is reduced, the four panel surface portions can each be stably rotated as described above.

[0008] The movable wall portion may be formed with a curved surface protruding downward, and the first radial recess and the second radial recess may be disposed radially across a lowermost portion of the movable wall portion that is located at the lowest position.

[0009] Since the movable wall portion is formed into a curved shape that protrudes downward, it is possible to ensure a pressure-receiving area of ​​the movable wall portion and also to ensure a large upward deformation allowance of the movable wall portion when pressure is reduced. Since the first radial recess and the second radial recess are located at the lowest of the movable wall portion and are arranged radially across the lowest portion which is least likely to deform upward when pressure is reduced, this lowest portion is included in the four panel surface portions, making it easier to smoothly rotate the movable wall portion upward as described above when pressure is reduced. Effect of the Invention

[0010] According to this invention, when the pressure inside the bottle is reduced, the movable wall portion can be easily rotated upward about the connection portion with the raised peripheral wall portion. [Brief description of the drawings]

[0011] [Figure 1] 1 is a side view of a vacuum absorption bottle according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a bottom view of a vacuum absorption bottle according to one embodiment of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 11 is a bottom view of a vacuum absorption bottle shown as a modified example according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a vacuum absorption bottle according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the vacuum absorption bottle 1 according to this embodiment includes a mouth part 11, a shoulder part 12, a body part 13 and a bottom part 14, and these parts 11 to 14 are roughly arranged in this order with their central axes aligned on a common axis.

[0013] Hereinafter, the common axis will be referred to as the bottle axis O, the side of the mouth 11 along the bottle axis O will be referred to as the upper side, the side of the bottom 14 along the bottle axis O will be referred to as the lower side, the direction along the bottle axis O will be referred to as the up-down direction, the direction that intersects the bottle axis O when viewed from the up-down direction will be referred to as the radial direction, and the direction that rotates around the bottle axis O when viewed from the up-down direction will be referred to as the circumferential direction. The vacuum absorption bottle 1 is integrally formed from a synthetic resin material by blow molding a preform formed into a bottomed cylindrical shape by injection molding. A cap (not shown) is attached to the mouth part 11. The mouth part 11, shoulder part 12, body part 13 and bottom part 14 each have a circular cross-sectional shape perpendicular to the bottle axis O.

[0014] The body portion 13 is formed with a plurality of circumferential grooves 15 extending continuously around the entire circumference at intervals in the vertical direction. The bottom portion 14 is formed in a cup shape having a cylindrical heel portion 17 whose upper end opening is connected to the lower end opening of the body portion 13, and a bottom wall portion 19 that closes the lower end opening of the heel portion 17 and has an outer peripheral edge that serves as a ground contact portion 18.

[0015] As shown in Figures 2 and 3, the bottom wall portion 19 includes a raised peripheral wall portion 21 that connects to the grounding portion 18 from the radially inner side and extends upward, an annular movable wall portion 22 that extends radially inward from the upper end of the raised peripheral wall portion 21, and a central wall portion 23 that connects to the radially inner end portion of the movable wall portion 22.

[0016] The rising peripheral wall portion 21 has a lower portion that extends substantially straight in the up-down direction from the ground contact portion 18, and an upper portion that extends radially inward as it heads upward from the upper end of the lower portion. The rising peripheral wall portion 21 may extend substantially straight in the up-down direction over its entire length in the up-down direction, or may extend radially inward as it heads upward over its entire length in the up-down direction.

[0017] The central wall portion 23 extends upward from the radial inner end of the movable wall portion 22. The central wall portion 23 is arranged coaxially with the bottle axis O and is formed in a cylindrical shape with a diameter increasing from the top to the bottom. The peripheral wall of the central wall portion 23 is formed in a curved shape protruding toward the inside in the radial direction. In a vertical cross-sectional view along the up-down direction, the radius of curvature of the peripheral wall of the central wall portion 23 is smaller than the radius of curvature of the movable wall portion 22. A disk-shaped top wall 24 arranged coaxially with the bottle axis O is connected to the upper end of the central wall portion 23, and the central wall portion 23 and the top wall 24 together form a topped cylindrical shape. The central wall portion 23 has a circular shape in a cross-sectional view. The central wall portion 23 may have, for example, a square shape in a cross-sectional view.

[0018] The movable wall portion 22 is formed in an annular shape and is disposed coaxially with the bottle axis O. The movable wall portion 22 has a radially outer end connected to an upper end of the rising peripheral wall portion 21 and a radially inner end connected to a lower end of the central wall portion 23. The radially outer end of the movable wall portion 22 and the upper end of the rising peripheral wall portion 21 are connected to each other via a curved portion 25 that is recessed upward. The movable wall portion 22 is rotatable about the curved portion (the connection portion with the rising peripheral wall portion 21) 25 so as to move the central wall portion 23 in the up and down directions.

[0019] The movable wall portion 22 is formed with a curved surface that protrudes downward. The lowest portion 22a of the movable wall portion 22, which is located at the lowest position, is disposed in a portion that is located radially outward from the radial center position of the movable wall portion 22. The movable wall portion 22 extends upward as it moves away from the lowest portion 22a in the radial direction. The lowermost portion 22a may be disposed at the radial center position of the movable wall portion 22, or may be disposed at a portion of the movable wall portion 22 located radially inward from the radial center position.

[0020] The lowermost part 22a is located below the curved surface part 25. In a vertical cross-sectional view along the up-down direction, the radius of curvature of the portion of the movable wall part 22 where the lowermost part 22a is located is larger than the radius of curvature of the curved surface part 25. In the vertical cross-sectional view, the radius of curvature of the portion of the movable wall part 22 located radially inward from the lowermost part 22a is larger than the radius of curvature of the portion of the movable wall part 22 located radially outward from the lowermost part 22a.

[0021] The reduced pressure absorption bottle 1 constructed as above is filled with high temperature (e.g., about 40°C to 95°C) contents, at which time the movable wall portion 22 is displaced and deformed downward. By sealing in this state, when the pressure inside the reduced pressure absorption bottle 1 is reduced by subsequent cooling, the movable wall portion 22 rotates upward around the curved surface portion 25 while deforming upward, and the reduced pressure is absorbed.

[0022] In this embodiment, the movable wall portion 22 is formed with a plurality of dimples 31 formed in a curved surface shape recessed upward. A first radial recess 26, in which a plurality of dimples 31 are arranged along one direction X of the radial direction, is disposed separately on both sides of the bottle axis O in the radial direction, and a second radial recess 27, in which a plurality of dimples 31 are arranged along another direction Y perpendicular to the one direction X of the radial direction, is disposed separately on both sides of the bottle axis O in the radial direction. The first radial recess 26 extends radially inward from both ends of the movable wall portion 22 in the one direction X, and the second radial recess 27 extends radially inward from both ends of the movable wall portion 22 in the other direction Y. The first radial recess 26 and the second radial recess 27 are disposed across the lowermost portion 22a of the movable wall portion 22 in the radial direction. The first radial recess 26 and the second radial recess 27 are provided over the entire radial area of ​​the movable wall portion 22.

[0023] The movable wall portion 22 is divided into four panel surface portions 28 sandwiched between the first radial recess 26 and the second radial recess 27 in the circumferential direction. On the outer peripheral edge of the panel surface portion 28, a short radial recess 29, a first group of dimples 32, and one dimple 31 are arranged in this order along the circumferential direction from the first radial recess 26 side to the second radial recess 27 side.

[0024] The short radial recess 29 is configured by a plurality of dimples 31 arranged in a radial direction. The short radial recess 29 is separated in the circumferential direction from the first radial recess 26. The radial inner end of the short radial recess 29 is located radially outward from the radial inner ends of the first radial recess 26 and the second radial recess 27. The radial inner end of the short radial recess 29 is located in the radial center of the movable wall portion 22. The first dimple group 32 is made up of two dimples 31 connected in the circumferential direction and two more dimples 31 connected radially outward from the connection portion of these dimples 31. The radial inner end of the first dimple group 32 is located radially outward from the radial inner end of the short radial recess 29. The first dimple group 32 is spaced apart from the short radial recess 29 in the circumferential direction. One dimple 31 located between the first dimple group 32 and the second radial recess 27 is located radially outward from the radial inner end of the first dimple group 32. This one dimple 31 is spaced apart from the first dimple group 32 and the second radial recess 27 in the circumferential direction.

[0025] In the movable wall portion 22, a plurality of dimples 31 are arranged at both ends in the one direction X, at least in the radial and circumferential directions, and are arranged more densely than in other portions. In a bottom view, the ratio of the number of dimples 31 to a certain area of ​​the movable wall portion 22 (a square having an area of ​​2% of a downward projection area of ​​a portion of the bottom wall portion 19 located radially inward from the curved surface portion 25 in a bottom view) is greatest at both ends of the movable wall portion 22 in the one direction X.

[0026] The multiple dimples 31 located at both ends of the movable wall portion 22 in the one direction X are composed of a portion that constitutes the radial outer end of the first radial recess 26 and a second dimple group 33. The second dimple group 33 is connected from both circumferential sides to the radial outer end of the first radial recess 26. The second dimple group 33 is made up of a first dimple row 33a, a second dimple row 33b, and a third dimple row 33c.

[0027] The first dimple row 33a is made up of two dimples 31 that are connected in the radial direction, and are connected in the circumferential direction to the radially outer end of the first radial recess . The second dimple row 33b is made up of two dimples 31 aligned in the radial direction, and is aligned with the first dimple row 33a on the side of the second radial recess 27 along the circumferential direction. The third dimple row 33c consists of two dimples 31 arranged in a direction extending radially outward as they move from the radial inner end of the short radial recess 29 toward the first radial recess 26 along the circumferential direction, and is connected to the radial inner end of the second dimple row 33b.

[0028] In bottom view, the pattern formed by all the dimples 31 formed on the movable wall portion 22 is symmetrical with respect to a first line L1 extending in one direction X, and is also symmetrical with respect to a second line L2 extending in the other direction Y. In bottom view, the pattern formed by all the dimples 31 formed on the movable wall portion 22 is asymmetrical with respect to a straight line that passes through the bottle axis O and forms an angle of 45° with the first line L1 and the second line L2.

[0029] All of the dimples 31 formed on the movable wall portion 22 are formed to have substantially the same shape and size. The dimple 31 is composed of a connection recess 31a and a main body recess 31b formed on the bottom surface of the connection recess 31a. The inner diameter of the main body recess 31b is smaller than the inner diameter of the connection recess 31a. Two dimples 31 connected to each other are provided with a gap between the main body recesses 31b and with the connection recesses 31a overlapping or in contact with each other.

[0030] As described above, according to the reduced pressure absorption bottle 1 of this embodiment, the movable wall portion 22 is provided with a pair of first radial recesses 26 and a pair of second radial recesses 27, so that the movable wall portion 22 is partitioned into four panel surface portions 28 circumferentially sandwiched between the first radial recesses 26 and the second radial recesses 27. When the pressure inside the reduced pressure absorption bottle 1 is reduced (hereinafter referred to as during pressure reduction), each of the four panel surface portions 28 can be rotated upward about the curved portion 25, making it easier to rotate the movable wall portion 22 upward about the curved portion 25.

[0031] In the movable wall portion 22, at both ends in the one direction X, a plurality of dimples 31 are arranged in a row at least in the radial and circumferential directions and are more densely arranged than in other portions, so that the thicknesses of both ends in the one direction X of the movable wall portion 22 are the thickest and have the highest rigidity in the movable wall portion 22. Therefore, it is possible to generate portions in the four panel surface portions 28 where stress is likely to concentrate during decompression and which serve as starting points for the above-mentioned rotation, making it possible to easily rotate the movable wall portion 22 as described above. In the illustrated example, stress is likely to concentrate in the portion of panel surface portion 28 located around second radial recess 27 (specifically, between first dimple group 32 and second radial recess 27) during pressure reduction.

[0032] When viewed from the bottom, the pattern formed by the multiple dimples 31 is symmetrical with respect to a first line L1 extending in one direction X, and is also symmetrical with respect to a second line L2 extending in the other direction Y, so that when pressure is reduced, the four panel surface portions 28 can each be stably rotated as described above.

[0033] Since the movable wall portion 22 is formed into a curved shape that protrudes downward, it is possible to ensure a pressure-receiving area of ​​the movable wall portion 22 and also to ensure a large upward deformation allowance of the movable wall portion 22 when pressure is reduced. Since the first radial recess 26 and the second radial recess 27 are arranged radially across the lowest part 22a of the movable wall portion 22, which is located at the lowest and is less likely to deform upward when pressure is reduced, the lowest part 22a is included in the four panel surface portions 28, making it easier to rotate the movable wall portion 22 smoothly upward as described above when pressure is reduced.

[0034] 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.

[0035] For example, the central wall portion 23 is not limited to the above embodiment, and may be modified as appropriate, for example, to extend straight along the vertical direction or to be formed in a flat plate shape. The bottom wall portion 19 may have no top wall 24 and may have, for example, a central wall portion 23 formed in a cone shape.

[0036] The second group of dimples 33 connected to both circumferential sides of the radial outer end of the first radial recess 26 may, for example, as shown in Figure 4, consist of two dimples 31 connected radially and four dimples 31 connected circumferentially from the connection portion of these dimples 31 toward the second radial recess 27, with the former two dimples 31 connected circumferentially to the first radial recess 26 and the latter four dimples 31 being circumferentially separated from the short radial recess 29. In the vertical cross section, the radius of curvature of a portion of the movable wall portion 22 located radially inward from the lowermost portion 22a may be equal to or smaller than the radius of curvature of a portion located radially outward from the lowermost portion 22a.

[0037] The synthetic resin material forming the vacuum absorption bottle 1 may be, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend of these materials, and may be changed as appropriate. The vacuum absorption bottle 1 is not limited to a single-layer structure, but may be a laminated structure having an intermediate layer. Examples of the intermediate layer include a layer made of a resin material having gas barrier properties, a layer made of a recycled material, or a layer made of a resin material having oxygen absorbing properties. In the above embodiment, the cross-sectional shape of each of the mouth 11, shoulder 12, body 13 and bottom 14 perpendicular to the bottle axis O is circular, but this is not limited to this and may be changed as appropriate, for example, to an angular shape.

[0038] 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]

[0039] 1 Vacuum absorption bottle 14 Bottom 18 Grounding part 19 Bottom wall 21 Rising peripheral wall 22 Movable wall section 22a Bottom 25 Curved surface (connection part) 26 First radial recess 27 Second radial recess 31 Dimple L1 1st line L2 2nd line O Bottle stem X one direction Y other direction

Claims

1. A cylindrical vacuum absorption bottle with a bottom made of a synthetic resin material, The bottom wall of the bottom portion is A grounding portion located on an outer periphery; a rising peripheral wall portion extending upward from a radially inner side of the ground contact portion; and an annular movable wall portion extending radially inward from an upper end portion of the rising peripheral wall portion, the movable wall portion is disposed so as to be rotatable in the up-down direction around a connection portion with the rising peripheral wall portion, A plurality of dimples are formed on the movable wall portion so as to have a curved surface that is recessed upward, A first radial recess formed by connecting a plurality of the dimples along one of the radial directions is disposed on both sides of the bottle shaft in the radial direction, A second radial recess formed by connecting a plurality of the dimples along another direction perpendicular to the one direction in the radial direction is disposed on both sides of the bottle shaft in the radial direction, The first radial recesses extend radially inward from both ends of the movable wall portion in the one direction, The second radial recesses extend radially inward from both ends of the movable wall portion in the other direction, In the movable wall portion, the plurality of dimples are arranged in a series at least in a radial direction and a circumferential direction at both end portions in the one direction and are more densely arranged than in other portions, In a bottom view of the vacuum absorption bottle, a pattern formed by the plurality of dimples is symmetrical with respect to a first line extending in the one direction and is symmetrical with respect to a second line extending in the other direction.

2. The movable wall portion is formed into a curved surface protruding downward, The vacuum absorption bottle according to claim 1 , wherein the first radial recess and the second radial recess are disposed across a lowermost portion of the movable wall portion in a radial direction.

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