Bottle

Abstract

To provide a bottle in which the lower portion of a lower panel part is deformed inward in the radial direction to be restored when the pressure in the bottle is reduced after hot filling.SOLUTION: In a bottle, a mouth part 11, a shoulder part 12, a barrel part 13, and a bottom part 14 are continuously disposed in this order from the upper side to the lower side along the direction of a bottle axis O; an upper panel part 18 recessed radially inward is disposed on the upper portion of the barrel part; a lower panel part 19 recessed radially inward is disposed on the lower portion of the barrel part; first ribs 25 are separately disposed at both circumferential ends of the lower panel part; a side surface 25a extending radially from a bottom surface 19b of the lower panel part among surfaces of the first ribs has a linear shape extending in the direction crossing the bottom surface of the lower panel part in the cross-sectional view including the side surface and the bottom surface of the lower panel part; and the first rib is located below a central portion of the lower panel part in the bottle axis direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, as shown in Patent Document 1 below, for example, bottles have been known in which the mouth, shoulder, body, and bottom are connected in this order from top to bottom along the axial direction of the bottle, and an upper panel portion is provided at the top of the body that is recessed radially inward, and a lower panel portion is provided at the bottom of the body that is also recessed radially inward. In this type of bottle, generally, when heated contents are filled, known as hot filling, the upper and lower panel portions bulge and deform radially outward, and then, as the contents cool with the cap attached to the mouth, the pressure inside the bottle decreases, causing the upper and lower panel portions to return to their original shape radially inward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-179872 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the conventional bottles described above, for example, if the bottle is made thin-walled to reduce weight, due to the influence of the weight of the contents, etc., even if the pressure inside the bottle is reduced after hot filling, the lower panel portion, particularly the lower portion located below the center in the axial direction of the bottle, may not restore its original shape radially inward and may remain in a bulging, deformed state.

[0005] The present invention provides a bottle that can restore and deform the lower part of the lower panel portion radially inward when the pressure inside the bottle is reduced after hot filling. [Means for solving the problem]

[0006] A bottle according to one embodiment of the present invention has a mouth, shoulder, body, and bottom that are connected in this order from top to bottom along the bottle axis, an upper panel portion that is recessed radially inward is provided at the upper part of the body, and a lower panel portion that is recessed radially inward is provided at the lower part of the body, first ribs are provided at both circumferential ends of the lower panel portion, and the side surface of the first rib that extends radially from the bottom surface of the lower panel portion is linear and extends in a direction intersecting the bottom surface of the lower panel portion in a cross-sectional view including this side surface and the bottom surface of the lower panel portion, and the first rib is located below the center of the lower panel portion in the bottle axis direction.

[0007] The first ribs are provided separately on both circumferential ends of the lower panel, and the side surfaces of the first ribs are linear in cross section as described above. This ensures the rigidity of the lower portion of the lower panel, which is particularly susceptible to the weight of the contents, even if the bottle body is made thin to reduce weight. This makes it possible to prevent the lower portion of the lower panel from significantly expanding and deforming radially outward during hot filling, and also makes it easier for the lower portion of the lower panel to return to its original shape radially inward when the pressure inside the bottle is reduced after hot filling. Since the first rib is provided in limited areas of the lower panel portion, namely both circumferential ends, and is not connected circumferentially, it is possible to suppress a decrease in vacuum absorption capacity due to the provision of the first rib in the lower panel portion.

[0008] The first rib may protrude radially outward from the bottom surface of the lower panel portion, and the outer surface of the first rib facing radially outward may be located radially inward from the outer peripheral surface of the body portion.

[0009] Of the surfaces of the first rib that protrude radially outward from the bottom surface of the lower panel portion, the outer surface facing radially outward is located radially inward from the outer peripheral surface of the body portion. This allows the first rib to deform smoothly in accordance with the radial deformation of the lower panel portion, thereby preventing the radial deformation of the lower panel portion from being hindered by the first rib and making it less likely that areas will develop where stress is concentrated when the lower panel portion is deformed radially.

[0010] Second ribs may be provided separately at both circumferential ends of the lower panel portion, the second ribs may be located above the center of the lower panel portion in the bottle axial direction, and the first rib and the second rib may be formed to have the same shape and size.

[0011] Since second ribs are provided at both circumferential ends of the lower panel portion, positioned above the center of the lower panel portion in the bottle axial direction, when the pressure inside the bottle is reduced after hot filling, it is possible to reliably restore and deform the lower part of the lower panel portion radially inward. Since the first rib and the second rib are formed to have the same shape and size, it becomes easier to make the upper and lower parts of the lower panel look the same, preventing deterioration in appearance. [Effects of the Invention]

[0012] According to one aspect of the present invention, when the pressure inside the bottle is reduced after hot filling, the lower part of the lower panel portion can be restored and deformed radially inward. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a side view of an embodiment of a bottle. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a bottle according to one embodiment of the present invention will be described with reference to the drawings. As shown in Figure 1, the bottle 1 of this embodiment is configured by connecting a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14 in this order from top to bottom along the bottle axis O. Hereinafter, when viewed from the direction of the bottle axis O, a direction intersecting the bottle axis O is referred to as a radial direction, and a direction going around the bottle axis O is referred to as a circumferential direction.

[0015] Bottle 1 has a single-layer structure and is formed by biaxially stretching blow molding a preform formed by injection molding. The capacity of bottle 1 is 1500 ml or less, preferably 300 ml to 1000 ml. In the illustrated example, the capacity of bottle 1 is, for example, approximately 1000 ml, and the weight is approximately 36 g. The bottle 1 is not limited to a single-layer structure but may have a laminated structure, and the laminated structure may be formed by blow molding a laminated parison that is combined in two layers (inner and outer) by extrusion molding, for example.

[0016] The bottom portion 14 is formed in a cylindrical shape with a bottom, and the peripheral wall of the bottom portion 14 extends radially inward as it extends downward. The peripheral wall of the bottom portion 14 is formed in a curved shape that protrudes radially outward. The bottle 1 is a rectangular bottle in which the shoulder portion 12 and the body portion 13 are made up of panel surface portions 15 and corner surface portions 16 that are alternately connected in the circumferential direction. The panel surface portions 15 are wider in the circumferential direction than the corner surface portions 16. The panel surface portions 15 and the corner surface portions 16 are alternately connected in the circumferential direction via dividing ridge portions 17. Four panel surface portions 15 and four corner surface portions 16 are provided.

[0017] An upper panel portion 18 recessed radially inward is provided at the upper part of the body portion 13, and a lower panel portion 19 recessed radially inward is provided at the lower part of the body portion 13. A circumferential groove 13a extending continuously over the entire circumferential length is formed in the center of the body 13 in the direction of the bottle axis O. The circumferential groove 13a has a curved surface that is recessed radially inward when viewed in a vertical cross section along the bottle axis O. An upper panel portion 18 is provided in a portion of the body portion 13 located above the circumferential groove 13a, and a lower panel portion 19 is provided in a portion of the body portion 13 located below the circumferential groove 13a. The upper panel portion 18 and the lower panel portion 19 are disposed on the panel surface portion 15.

[0018] When viewed from the outside in the radial direction, the upper panel portion 18 and the lower panel portion 19 each have a rectangular shape that is long in the direction of the bottle axis O. The circumferential centers of the lower panel portion 19 and the upper panel portion 18 are located at the same position in the circumferential direction. The circumferential sizes of the lower panel portion 19 and the lower panel portion 19 are the same. The size of the lower panel portion 19 in the direction of the bottle axis O is smaller than the size of the upper panel portion 18 in the direction of the bottle axis O.

[0019] The size of the lower panel portion 19 in the direction of the bottle axis O is larger than the distance between the circumferential groove 13a and the lower panel portion 19 in the direction of the bottle axis O, and the size of the portion of the body portion 13 that is located below the lower panel portion 19 in the direction of the bottle axis O. The circumferential size of the lower panel portion 19 is larger than the distance between the lower panel portion 19 and the dividing ridge portion 17 in the direction of the bottle axis O.

[0020] A first lateral groove 21 extending in the circumferential direction is formed in the body 13 in a portion located below the lower panel portion 19. The distance in the bottle axis O direction between the first lateral groove 21 and the lower panel portion 19 is larger than the distance in the bottle axis O direction between the lower panel portion 19 and the circumferential groove 13a. The circumferential centers of the first lateral grooves 21 and the lower panel portion 19 are located at the same circumferential position. The circumferential size of the first lateral grooves 21 is larger than the circumferential size of the lower panel portion 19. Both circumferential ends of the first lateral grooves 21 are located circumferentially outward of both circumferential ends of the lower panel portion 19. Both circumferential ends of the first lateral grooves 21 intersect with the dividing ridge portions 17. Both circumferential ends of the first lateral grooves 21 are located at the corner surface portions 16. Both circumferential ends of the first lateral grooves 21 are away from the circumferential center of the corner surface portions 16.

[0021] A second transverse groove 23 extending in the circumferential direction is formed in the body portion 13 in a portion located below the first transverse groove 21. The circumferential size of the second transverse groove 23 is smaller than the circumferential size of the lower panel portion 19. The circumferential centers of the second transverse groove 23 and the lower panel portion 19 are located at the same position in the circumferential direction. The distance between the second transverse groove 23 and the first transverse groove 21 in the direction of the bottle axis O is smaller than the distance between the first transverse groove 21 and the lower panel portion 19 in the direction of the bottle axis O.

[0022] Panel grooves 19a extending in the circumferential direction are formed at both ends of the lower panel portion 19 in the direction of the bottle axis O. The panel grooves 19a are formed over the entire circumferential length of the lower panel portion 19. It is not necessary to form the panel grooves 19a in the lower panel portion 19. The portion of the lower panel portion 19 that is connected to the panel groove 19a on the inward side, i.e., the central portion of the lower panel portion 19 in the direction of the bottle axis O, extends radially inward as it moves away from the panel groove 19a toward the inside in the direction of the bottle axis O. Both circumferential ends of the lower panel portion 19 extend radially inward as they move toward the inside, i.e., the central portion of the lower panel portion 19 in the circumferential direction.

[0023] In this embodiment, first ribs 25 that protrude radially outward are provided on both circumferential ends of the lower panel portion 19. The first ribs 25 are located below the center of the lower panel portion 19 in the direction of the bottle axis O. The first ribs 25 are spaced upward from the panel grooves 19a provided at the lower end of the lower panel portion 19. The first ribs 25 provided at both circumferential ends of the lower panel portion 19 are provided at the same position in the direction of the bottle axis O. The first ribs 25 are spaced apart in the circumferential direction. When viewed from the outside in the radial direction, the first ribs 25 are symmetrical with respect to the bottle axis O. The size of the first rib 25 in the direction of the bottle axis O is less than one-third of the size of the lower panel portion 19 in the direction of the bottle axis O. The circumferential size of the first rib 25 is less than one-third of the circumferential size of the lower panel portion 19.

[0024] Of the surfaces of the first rib 25, a side surface 25a rising radially outward from the bottom surface 19b of the lower panel portion 19 presents a straight line extending in a direction intersecting the bottom surface 19b of the lower panel portion 19 in a cross-sectional view including this side surface 25a and the bottom surface 19b of the lower panel portion 19. The side surface 25a of the first rib 25 forms an obtuse angle with the bottom surface 19b of the lower panel portion 19.

[0025] When viewed from the outside in the radial direction, the first rib 25 has a horizontal trapezoidal shape in which an upper base 25c and a lower base 25d that is longer than the upper base 25c extend in the bottle axis O direction. The upper base 25c is located inside the lower base 25d, closer to the circumferential center of the lower panel portion 19. When viewed from the outside in the radial direction, the lower base 25d extends close to and parallel to an extension line of the opening periphery L of the lower panel portion 19 on the outer peripheral surface of the body portion 13. The first rib 25 may be appropriately modified, for example, to have a configuration that shows a part of a circle having an arc and a chord, a triangular shape, or a quadrangular shape when viewed from the outside in the radial direction.

[0026] The first rib 25 is continuous with the opening periphery L of the lower panel portion 19 on the outer peripheral surface of the body portion 13. In the illustrated example, an outer surface 25b of the first rib 25 facing radially outward is located radially inward from the outer peripheral surface of the body portion 13. The outer surface 25b of the first rib 25 may be located radially outward from the outer circumferential surface of the body portion 13, or may be located on the same plane.

[0027] Second ribs 26 that protrude radially outward are provided on both circumferential ends of the lower panel portion 19. The second ribs 26 are located above the center of the lower panel portion 19 in the direction of the bottle axis O. The second ribs 26 are spaced upward from the first ribs 25. The second ribs 26 are spaced downward from the panel grooves 19a provided at the upper end of the lower panel portion 19. The distance in the direction of the bottle axis O between the second rib 26 and the panel groove 19a provided at the upper end of the lower panel portion 19 is the same as the distance in the direction of the bottle axis O between the first rib 25 and the panel groove 19a provided at the lower end of the lower panel portion 19. These distances are the same as the distance in the direction of the bottle axis O between the first rib 25 and the second rib 26.

[0028] The first rib 25 and the second rib 26 are formed to have the same shape and size. When viewed from the outside in the radial direction, the first rib 25 and the second rib 26 are symmetrical with respect to a line that passes through the center of the lower panel portion 19 in the bottle axis O direction and extends in the circumferential direction.

[0029] As described above, in the bottle 1 according to this embodiment, the first ribs 25 are provided separately on both circumferential ends of the lower panel portion 19. This, combined with the fact that the side surfaces 25a of the first ribs 25 are linear in cross section as described above, ensures the rigidity of the lower portion of the lower panel portion 19, which is particularly susceptible to the weight of the contents, even if the body portion 13 is thinned to reduce weight. This makes it possible to prevent the lower portion of the lower panel portion 19 from significantly expanding and deforming radially outward during hot filling, and also makes it easier for the lower portion of the lower panel portion 19 to return to its original shape and deform radially inward when the pressure inside the bottle 1 is reduced after hot filling.

[0030] Since the first rib 25 is provided in limited areas of the lower panel portion 19, namely both circumferential ends, and is not connected in the circumferential direction, it is possible to suppress a decrease in vacuum absorption capacity due to the provision of the first rib 25 on the lower panel portion 19.

[0031] Of the surfaces of the first rib 25 that protrude radially outward from the bottom surface 19b of the lower panel portion 19, the outer surface 25b facing radially outward is located radially inward from the outer peripheral surface of the body portion 13. This allows the first rib 25 to deform smoothly in accordance with the radial deformation of the lower panel portion 19, thereby preventing the radial deformation of the lower panel portion 19 from being hindered by the first rib 25 and making it less likely that areas where stress will concentrate will be created when the lower panel portion 19 is deformed radially.

[0032] Since second ribs 26 are provided at both circumferential ends of the lower panel portion 19, positioned above the center of the lower panel portion 19 in the direction of the bottle axis O, when the pressure inside the bottle 1 is reduced after hot filling, it is possible to reliably restore and deform the lower part of the lower panel portion 19 toward the radially inward direction. Since the first rib 25 and the second rib 26 are formed to have the same shape and size, it becomes easy to make the upper and lower parts of the lower panel part 19 look the same, and deterioration of the appearance can be prevented.

[0033] 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.

[0034] For example, although a rectangular bottle has been shown in the above embodiment, a round bottle having a circular cross section may also be used. Although the circumferential groove 13a, the first transverse groove 21, and the second transverse groove 23 are formed in the body portion 13, the circumferential groove 13a, the first transverse groove 21, and the second transverse groove 23 do not necessarily have to be formed in the body portion 13. In the above embodiment, the first rib 25 and the second rib 26 are shown as being configured to protrude radially outward from the bottom surface 19b of the lower panel portion 19, but a configuration in which they are recessed radially inward from the bottom surface 19b of the lower panel portion 19 may also be adopted.

[0035] The synthetic resin material forming the bottle 1 may be, for example, polyester such as polyethylene terephthalate or polyethylene naphthalate, or polyolefin such as polyethylene or polypropylene, or ethylene vinyl alcohol copolymer (EVOH), etc. Among these, examples of polyethylene include low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).

[0036] In addition, within the scope of the spirit of the present invention, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and the above-described variations may be combined as appropriate. [Explanation of symbols]

[0037] 1 bottle 11 Mouth 12 Shoulder 13 Torso 14 Bottom 18 Upper panel 19 Lower panel 19b bottom 25 First Rib 25a side 25b External surface 26 Second Rib O Bottle stem

Claims

1. The mouth, shoulder, body, and bottom are arranged in this order from top to bottom along the bottle axial direction, An upper panel portion recessed radially inward is provided on an upper portion of the body portion, A lower panel portion recessed radially inward is provided at a lower portion of the body portion, A first rib is provided at each of both circumferential ends of the lower panel portion, Among the surfaces of the first rib, a side surface extending radially from a bottom surface of the lower panel portion has a straight line shape extending in a direction intersecting with the bottom surface of the lower panel portion in a cross-sectional view including the side surface and the bottom surface of the lower panel portion, A bottle, wherein the first rib is located below a center portion of the lower panel portion in an axial direction of the bottle.

2. The first rib protrudes radially outward from a bottom surface of the lower panel portion, The bottle according to claim 1 , wherein an outer surface of the first rib facing radially outward is located radially inward from an outer peripheral surface of the body portion.

3. A second rib is provided at each of both circumferential ends of the lower panel portion, The second rib is located above a center portion of the lower panel portion in the bottle axial direction, The bottle according to claim 1 or 2, wherein the first rib and the second rib are formed to have the same shape and size as each other.

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