Vacuum absorption bottle

Abstract

When the pressure inside the bottle is reduced, the movable wall section is smoothly deformed upwards. [Solution] A bottomed cylindrical vacuum absorption bottle made of synthetic resin material, the bottom wall portion 10 of the bottom portion 14 comprises a ground contact portion 18 located at the outer peripheral edge, a rising peripheral wall portion 21 that extends upward from the radially inward side of the ground contact portion, and a movable wall portion 22 that extends radially inward from the upper end of the rising peripheral wall portion and is formed to be deformable in the vertical direction, and the movable wall portion has one or two groove portions 31 that extend radially and are recessed upward when viewed from the vertical direction, with the bottle shaft O being sandwiched radially, and the groove width of the groove portion narrows from the lower end opening side toward the upper end groove bottom surface 31a side.

Description

Technical Field

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

Background Art

[0002] Conventionally, as a vacuum absorption bottle formed in a bottomed cylindrical shape from a synthetic resin material, for example, as shown in Patent Document 1 below, the bottom wall portion of the bottom has a grounding portion located at the outer peripheral edge portion, a rising peripheral wall portion that continues from the grounding portion radially inward and extends upward, and a movable wall portion that extends radially inward from the upper end portion of the rising peripheral wall portion and is formed to be deformable in the vertical direction. By the movable wall portion deforming upward, a configuration is known in which the vacuum in the bottle is absorbed to suppress deformation of the body portion and the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, depending on the shape of the movable wall portion, when filling the content liquid, the movable wall portion may bulge and deform excessively downward, or when the pressure in the bottle is reduced, the movable wall portion may be less likely to deform upward. In this case, the vacuum absorption capacity becomes small.

[0005] The present invention provides a vacuum absorption bottle capable of smoothly deforming the movable wall portion upward when the pressure in the bottle is reduced.

Means for Solving the Problems

[0006] A vacuum absorption bottle according to one aspect of the present invention is a bottomed cylindrical vacuum absorption bottle made of a synthetic resin material, the bottom wall portion of which comprises a contact portion located at the outer peripheral edge, a rising peripheral wall portion that is connected to the contact portion radially from the inside and extends upward, and a movable wall portion that extends radially inward from the upper end of the rising peripheral wall portion and is formed to be deformable in the vertical direction, the movable wall portion having one or two grooves that extend radially and are recessed upward when viewed from the vertical direction, with the groove width narrowing from the lower end opening side toward the upper end groove bottom surface side.

[0007] The movable wall has one or two grooves that extend radially when viewed from above and are recessed upwards, sandwiching the bottle shaft radially. As a result, the grooves are provided only in specific locations on the movable wall. Therefore, when the pressure inside the bottle is reduced, the portion of the movable wall where the grooves are located preferentially deforms upwards to narrow the width of the grooves. This deformation then starts from this point and extends to other parts, allowing the entire movable wall to deform smoothly upwards. Since the groove width of the groove section narrows from the lower end opening side towards the upper end groove bottom surface side, the movable wall section can be reliably deformed as described above to narrow the groove width of the groove section when the pressure inside the bottle is reduced.

[0008] In the groove portion, the groove width at the lower end opening may be 1.2 times or more and 3 times or less the groove width at the bottom of the groove.

[0009] In the groove section, the groove width at the lower end opening is 1.2 times or more and 3 times or less the groove width at the bottom of the groove. Therefore, when the pressure inside the bottle is reduced, the movable wall section can be reliably deformed as described above to narrow the groove width. If the ratio is less than 1.2 times, the moldability deteriorates, and the rigidity of the groove increases, making it difficult for the groove width to narrow when the pressure inside the bottle is reduced. If the ratio exceeds 3 times, when the pressure inside the bottle is reduced, the groove is less likely to act as a starting point for deformation (displacement), and it deforms upward along with the surrounding parts of the groove. This increases the stress required to deform the movable wall upward, making it difficult to deform the entire movable wall upward.

[0010] The groove width of the groove portion may change as it moves radially away from the radial center of the groove portion.

[0011] Since the groove width of the groove changes as you move radially away from the radial center of the groove, it is possible to suppress the uniformity of the stress generated in the groove during depressurization inside the bottle, and the movable wall can be reliably deformed as described above to narrow the groove width during depressurization inside the bottle.

[0012] The movable wall portion may be formed in a curved shape that protrudes downward, and the groove portion may be arranged to straddle the lowest part of the movable wall portion in the radial direction.

[0013] Since the movable wall is formed in a curved shape that protrudes downward, it is possible to secure a pressure-receiving area for the movable wall, and it is also possible to secure a large amount of upward deformation range for the movable wall when the pressure inside the bottle is reduced. Since the groove is located at the lowest point of the movable wall and is positioned radially across the lowest part which is less likely to deform upward when the pressure inside the bottle is reduced, it becomes possible to preferentially deform a portion of the lowest part of the movable wall upward when the pressure inside the bottle is reduced, and the movable wall can be reliably and smoothly deformed upward over its entire length. [Effects of the Invention]

[0014] According to the above embodiment of the present invention, when the pressure inside the bottle is reduced, the movable wall portion can be smoothly deformed upward. [Brief explanation of the drawing]

[0015] [Figure 1] The side view of the vacuum absorption bottle shown as an embodiment of the present invention. [Figure 2] The bottom view of the vacuum absorption bottle shown as an embodiment of the present invention. [Figure 3] It is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] It is a cross-sectional view taken along the line IV-IV in FIG. 2. [Figure 5] The bottom view of the vacuum absorption bottle shown as a modified example of the present invention.

Mode for Carrying Out the Invention

[0016] Hereinafter, referring to the drawings, a vacuum absorption bottle according to an embodiment of the present invention will be described. As shown in FIG. 1, the vacuum absorption bottle 1 according to the present embodiment includes a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14. These 11 to 14 are connected in this order in a state where their respective central axes are located on a common axis, and have a schematic configuration.

[0017] Hereinafter, the common axis is referred to as the bottle axis O. The side of the mouth portion 11 along the bottle axis O is the upper side, the side of the bottom portion 14 along the bottle axis O is the lower side, the direction along the bottle axis O is the vertical direction, and the direction intersecting the bottle axis O when viewed from the vertical direction is the radial direction, and the direction of orbiting around the bottle axis O when viewed from the vertical direction is the circumferential direction. The vacuum absorption bottle 1 is formed by blow molding a preform formed into a bottomed cylindrical shape by injection molding, and is integrally formed of a synthetic resin material. A cap (not shown) is attached to the mouth portion 11. The mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 each have a circular cross-sectional shape when viewed in a plane perpendicular to the bottle axis O.

[0018] A plurality of circumferential grooves 15 that continuously extend over the entire circumference are formed in the body portion 13 at intervals in the vertical direction. Note that, instead of the circumferential grooves 15, a plurality of panel portions that are recessed toward the inner side in the radial direction may be arranged at intervals in the circumferential direction on the body portion 13. The bottom portion 14 is formed in a cup shape including 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 10 that closes the lower end opening of the heel portion 17 and whose outer peripheral edge portion is the grounding portion 18.

[0019] As shown in FIGS. 2 and 3, the bottom wall portion 10 includes a rising circumferential wall portion 21 that extends upward continuously from the grounding portion 18 toward the inner side in the radial direction, a movable wall portion 22 that extends from the upper end portion of the rising circumferential wall portion 21 toward the inner side in the radial direction and is formed to be deformable in the vertical direction, and a central wall portion 23 that is continuous with the inner end portion in the radial direction of the movable wall portion 22. Note that, as the bottom wall portion 10, a configuration may be adopted in which the central wall portion 23 is not provided, and the entire portion located radially inward of the rising circumferential wall portion 21 is the movable wall portion 22.

[0020] The central wall portion 23 extends upward from the inner end portion in the radial direction 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 that expands in diameter from top to bottom. The peripheral wall of the central wall portion 23 is formed in a convex curved surface shape toward the inner side in the radial direction. A disc-shaped top wall 24 arranged coaxially with the bottle axis O is connected to the upper end portion of the central wall portion 23, and the central wall portion 23 and the top wall 24 together form a capped cylindrical shape. The central wall portion 23 has a circular shape in a cross-sectional view. Note that the central wall portion 23 may have, for example, a rectangular shape or the like in a cross-sectional view.

[0021] The movable wall portion 22 is formed in an annular shape and is arranged coaxially with the bottle axis O. The radial outer end of the movable wall portion 22 is connected to the upper end of the rising peripheral wall portion 21, and the radial inner end is connected to the lower end of the central wall portion 23. The radial 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 surface portion 25 that is recessed upward. The movable wall portion 22 is formed to be deformable in the vertical direction so as to move the central wall portion 23 in the vertical direction, and is rotatable around the curved surface portion (the connection portion with the rising peripheral wall portion 21) 25.

[0022] The movable wall portion 22 is formed in a curved shape that protrudes downward. The lowest part 22a of the movable wall portion 22 is located radially outward from the radial center of the movable wall portion 22. The movable wall portion 22 extends upward as it moves radially away from the lowest part 22a. The lowest part 22a is located below the curved surface portion 25. In a vertical cross-sectional view along the vertical direction, the radius of curvature of the portion of the movable wall portion 22 where the lowest part 22a is located is larger than the radius of curvature of the curved surface portion 25. The lowest part 22a may be positioned at the radial center of the movable wall portion 22, or it may be positioned in a part located radially inward from the radial center of the movable wall portion 22.

[0023] As described above, the vacuum absorption bottle 1 is filled with a liquid at a high temperature (for example, about 40°C to 95°C), and at this time, the movable wall portion 22 is displaced and deformed downward. By sealing it in this state, when the vacuum absorption bottle 1 is depressurized due to subsequent cooling, the movable wall portion 22 deforms upward and rotates upward around the curved surface portion 25, thereby absorbing the pressure reduction.

[0024] In this embodiment, the movable wall portion 22 has one or two grooves 31 that extend radially when viewed from above and are recessed upward, with the bottle shaft O being sandwiched radially between them. The grooves 31 are arranged on the movable wall portion 22 so as to extend only in one radial direction. The groove bottom surface 31a at the upper end of the groove 31 is formed smoothly over its entire length. The grooves 31 extend continuously without interruption over their entire radial length. In the illustrated example, grooves 31 are formed on the movable wall portion 22, one on each side of the central wall portion 23 in the radial direction. The movable wall portion 22 is a smooth surface throughout its entire length, excluding the grooves 31. Alternatively, the bottom wall portion 10 may be configured without a central wall portion 23, with only one groove 31 formed on the movable wall portion 22.

[0025] The groove width of the groove portion 31 narrows from the lower end opening side toward the upper end groove bottom surface 31a side. In the groove portion 31, the groove width at the lower end opening is between 1.2 and 3 times the groove width at the groove bottom surface 31a. If it is less than 1.2 times, the moldability deteriorates and the rigidity of the groove portion 31 also increases, making it difficult for the groove width to narrow when the pressure inside the bottle 1 is reduced. If it exceeds 3 times, when the pressure inside the bottle 1 is reduced, the groove portion 31 does not easily become the starting point and deforms (displaces) upward together with the surrounding portion of the groove portion 31, increasing the stress required to deform the movable wall portion 22 upward, making it difficult to deform the movable wall portion 22 upward over its entire surface.

[0026] Here, the groove width of the lower end opening of the groove 31 is the length of the portion of the imaginary line extending along the lower surface of the movable wall 22 that is separated from the lower surface of the movable wall 22 and covers the lower end opening of the groove 31, as shown in the cross-sectional view along the circumferential direction in Figure 4. In the groove 31, the connection between the groove bottom surface 31a and the circumferentially facing side surface 31b exhibits a curved shape (R-shape) that protrudes diagonally upward in a cross-sectional view along the circumferential direction, facing outward in the circumferential direction. The groove bottom surface 31a extends in a straight line in a cross-sectional view along the circumferential direction.

[0027] The maximum groove width of the groove bottom surface 31a is between 2 and 5 times the groove depth of the groove section 31 (for example, approximately 0.7 mm). If it is less than 2 times, the groove width of the groove section 31 becomes narrower, worsening moldability, and if it exceeds 5 times, the groove width of the groove section 31 becomes less likely to narrow when the pressure inside the bottle 1 is reduced. In the illustrated example, the groove width of the groove bottom surface 31a is maximum at the radial center of the groove bottom surface 31a, and its value is approximately 2.4 mm. The groove depth of the groove portion 31 is, for example, between 0.4 mm and 2.0 mm.

[0028] The circumferential ends of the radial center of the groove 31 exhibit a curved projection outward in the circumferential direction when viewed from above, but they may also extend straight radially when viewed from above. The groove width of the groove 31 changes as it moves radially away from the radial center of the groove 31. In the illustrated example, the groove width of the groove 31 narrows as it moves radially away from the radial center of the groove 31, but the groove width of the groove 31 may also widen as it moves radially away from the radial center of the groove 31. The groove width at both radial ends of the groove 31 is between 0.2 and 4 times the groove width of the radial center of the groove 31.

[0029] The groove 31 is positioned in the movable wall 22, straddling the radial center between the radial outer end and the radial inner end. The groove 31 is positioned straddling the lowest part 22a of the movable wall 22, which is the lowest part. The radial center of the groove 31 is located radially inward from the lowest part 22a of the movable wall 22. The radial center of the groove 31 may be located at the lowest part 22a of the movable wall 22, or it may be located radially outward from the lowest part 22a.

[0030] As shown in Figures 3 and 4, the connection portion (base portion of the groove 31) 32 between the upper surface of the movable wall portion 22 (inner surface of the bottle 1) and the groove portion 31 exhibits a concave curve shape in a vertical cross-sectional view along the vertical direction, and its radius of curvature is between 0.5 mm and 10 mm. If it is less than 0.5 mm, the rigidity of the connection portion 32 increases, making it less likely for the portion of the movable wall portion 22 where the groove portion 31 is located to deform upward when the pressure inside the bottle 1 is reduced. If it exceeds 10 mm, the groove width of the groove portion 31 becomes less likely to narrow when the pressure inside the bottle 1 is reduced.

[0031] As described above, in the vacuum absorption bottle 1 according to this embodiment, one or two grooves 31 are formed in the movable wall portion 22, extending radially when viewed from above and recessed upwards, with the bottle axis O sandwiched radially between them. Therefore, the grooves 31 are provided exclusively at predetermined locations on the movable wall portion 22. Consequently, when the pressure inside the bottle 1 is reduced, the portion of the movable wall portion 22 on which the grooves 31 are located preferentially deforms upwards to narrow the width of the grooves 31. This portion then acts as a starting point for deformation to extend to other portions, allowing the entire movable wall portion 22 to deform smoothly upwards.

[0032] Since the groove width of the groove portion 31 narrows from the lower end opening side towards the upper end groove bottom surface 31a side, the movable wall portion 22 can be reliably deformed as described above to narrow the groove width of the groove portion 31 when the pressure inside the bottle 1 is reduced.

[0033] In the groove 31, the groove width at the lower end opening is 1.2 times or more and 3 times or less the groove width of the groove bottom surface 31a. Therefore, when the pressure inside the bottle 1 is reduced, the movable wall portion 22 can be reliably deformed as described above to narrow the groove width of the groove 31.

[0034] Since the groove width of the groove 31 changes as it moves radially away from the radial center of the groove 31, it is possible to suppress the stress generated in the groove 31 when the pressure inside the bottle 1 is reduced from being uniform across the entire radial area, and the movable wall 22 can be reliably deformed as described above to narrow the groove width of the groove 31 when the pressure inside the bottle 1 is reduced.

[0035] Since the movable wall portion 22 is formed in a curved shape that protrudes downward, it is possible to secure a pressure-receiving area for the movable wall portion 22, and to secure a large amount of upward deformation range for the movable wall portion 22 when the pressure inside the bottle 1 is reduced. Since the groove 31 is located at the lowest point of the movable wall 22 and is positioned radially across the lowest part 22a, which is less likely to deform upward when the pressure inside the bottle 1 is reduced, it becomes possible to preferentially deform a portion of the lowest part 22a of the movable wall 22 upward when the pressure inside the bottle 1 is reduced, and the movable wall 22 can be reliably and smoothly deformed upward over its entire length.

[0036] 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.

[0037] For example, the central wall portion 23 is not limited to the above embodiment and may be modified as appropriate, such as extending straight along the vertical direction or being formed in a flat plate shape. The movable wall portion 22 may be formed, for example, as a flat plate with its front and back surfaces facing in the vertical direction. The bottom wall portion 10 may not have a central wall portion 23 and a top wall portion 24, but may have a disc-shaped movable wall portion. In this case, the movable wall portion may be formed in a flat plate shape or in a dome shape that protrudes downward, and a groove portion may be formed in this movable wall portion so as to straddle the bottle axis O in the radial direction and along its entire radial length, or it may be provided at a position radially away from the bottle axis O, as shown in Figure 2. The bottom wall portion 10 may not have a top wall portion 24, but instead may have a configuration such as a central wall portion 23 formed in a cone shape.

[0038] The groove width of the groove portion 31 may be the same along its entire radial length.

[0039] In the above embodiment, a bottom wall portion 10 having a movable wall portion 22 formed on a smooth surface over the entire area excluding the groove portion 31 was shown. However, a bottom wall portion 20 may be adopted in which other irregularities are formed in the portion of the movable wall portion 22 that does not have a groove portion 31. For example, as shown in Figure 5, the movable wall portion 22 may have, in addition to the groove portion 31, a first radial recess 42, a second radial recess 43, and a third radial recess 44, each consisting of multiple dimples 41 formed in a curved shape that curves upward and are connected radially, as well as a panel portion 45 that curves upward. In the illustrated example, the number of dimples 41 in the first radial recess 42, the second radial recess 43, and the third radial recess 44 are different from each other. As a result, the radial sizes of the first radial recess 42, the second radial recess 43, and the third radial recess 44 are different from each other, with the first radial recess 42 being the largest and the third radial recess 44 being the smallest. Two of each of the first radial recess 42, the second radial recess 43, and the third radial recess 44 are provided, one on each side of the movable wall 22, radially flanking the central wall 23. The panel section 45 has a triangular shape with a vertex angle at its radially inner end when viewed from above or below. Four panel sections 45 are provided, with two sets formed on the movable wall section 22, one on each side of the central wall section 23 in the radial direction, spaced apart in the circumferential direction. A groove portion 31 and a panel portion 45 are separately arranged on both sides of the first radial recess 42 in the circumferential direction. A third radial recess 44 is arranged between adjacent panel portions 45 in the circumferential direction. The groove 31, the first radial recess 42, the second radial recess 43, the third radial recess 44, and the panel portion 45 span the lowest part 22a in the radial direction.

[0040] The synthetic resin material forming the vacuum absorption bottle 1 may be changed as appropriate, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend thereof. The reduced-pressure absorption bottle 1 is not limited to a single-layer structure, but 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.

[0041] 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 embodiments and modifications may be combined as appropriate.

[0042] Examples of the present invention are as follows: <1> A bottomed cylindrical vacuum absorption bottle made of synthetic resin material, The bottom wall of the bottom The contact area located on the outer edge, The aforementioned ground contact portion includes a rising peripheral wall portion that extends upward from the radially inward direction, The movable wall portion extends radially inward from the upper end of the rising peripheral wall portion and is formed to be deformable in the vertical direction, The movable wall portion has one or two grooves that extend radially and are recessed upward when viewed from above, sandwiching the bottle shaft radially. A vacuum absorption bottle in which the width of the groove portion narrows from the lower end opening side towards the upper end groove bottom surface side. <2> In the groove portion, the groove width at the lower end opening is 1.2 times or more and 3 times or less the groove width at the bottom of the groove. <1> The vacuum absorption bottle described above. <3> The groove width of the groove portion changes as it moves radially away from the radial center of the groove portion. <1> or <2> The vacuum absorption bottle described above. <4> The movable wall portion is formed in a curved shape that protrudes downward, The groove portion is arranged to straddle the lowest part of the movable wall portion in the radial direction, <1> from <3> A vacuum absorption bottle as described in one of the following. [Explanation of Symbols]

[0043] 1. Vacuum absorption bottle 14 Bottom 18 Grounding part 10, 20 Bottom wall section 21 Rising peripheral wall section 22 Movable wall section 22a Bottom 31 Groove 31a Groove bottom surface O Bottle shaft

Claims

1. A bottomed cylindrical vacuum absorption bottle made of synthetic resin material, The bottom wall of the bottom The contact area located on the outer edge, The aforementioned ground contact portion includes a rising peripheral wall portion that extends upward from the radially inward direction, The movable wall portion extends radially inward from the upper end of the rising peripheral wall portion and is formed to be deformable in the vertical direction, The movable wall portion has one or two grooves that extend radially and are recessed upward when viewed from above, sandwiching the bottle shaft radially. A vacuum absorption bottle in which the width of the groove portion narrows from the lower end opening side towards the upper end groove bottom surface side.

2. The vacuum absorption bottle according to claim 1, wherein in the groove portion, the groove width at the lower end opening is 1.2 times or more and 3 times or less the groove width at the bottom of the groove.

3. The vacuum absorption bottle according to claim 1 or 2, wherein the groove width of the groove portion changes as it moves radially away from the radial center of the groove portion.

4. The movable wall portion is formed in a curved shape that protrudes downward, The groove portion is arranged to span radially across the lowest part of the movable wall portion, as described in claim 1 or 2 of the vacuum absorption bottle.

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