Container made of resin

Abstract

To provide a container made of resin, in which portions to which loads are applied are formed dispersedly.SOLUTION: A container made of resin comprises a mouth part positioned at an upper side, a bottom part positioned at a lower side, and a cylindrical trunk part positioned between the mouth part and the bottom part. The trunk part has a pair of ribs including an upper rib and a lower rib respectively extending in a circumferential direction of the trunk part. The upper rib has a first upper portion and a second upper portion having upward convex shapes. The lower rib has a first lower portion and a second lower portion having downward convex shapes. The first upper portion and the first lower portion are arranged along an axis line direction of the trunk part, and the second upper portion and the second lower portion are arranged along the axis line direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a resin container having a cylindrical body portion located between a mouth portion and a bottom portion. [Background technology]

[0002] Patent Document 1 discloses a synthetic resin container having a body formed in a rectangular cylindrical shape with side surfaces and chamfered corners. The chamfered corners are chamfered so that the cross section is arc-shaped. An annular groove is formed in the body so that the groove depth at the chamfered corners is deeper than that at the side surfaces. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-150746 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for reducing the amount of packaging materials used, for reasons such as reducing environmental impact. Therefore, thinner and lighter resin containers have been developed. However, these thinner and lighter containers can impair the physical properties of the resin container, such as its strength against vertical compressive loads. Therefore, it is desirable to avoid concentrating the load on a specific area of ​​the resin container. Therefore, the resin container described in this specification aims to distribute the load application area. [Means for solving the problem]

[0005] A resin container according to one embodiment is a resin container comprising a mouth portion located on an upper side, a bottom portion located on a lower side, and a cylindrical body portion located between the mouth portion and the bottom portion, the trunk portion has a pair of ribs including an upper rib and a lower rib extending in a circumferential direction of the trunk portion, the upper rib has a first upper portion and a second upper portion each having an upwardly convex shape; the lower rib has a first lower portion and a second lower portion each having a downwardly convex shape; the first upper portion and the first lower portion are aligned along the axial direction of the body portion, The second upper portion and the second lower portion are aligned along the axial direction. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view of a resin container according to a first embodiment. [Figure 2] FIG. 2 is an external view of the resin container according to the first embodiment. [Figure 3] FIG. 2 is a partially enlarged front view of the resin container according to the first embodiment. [Figure 4] 10 is an image showing distortion when a load is applied to a resin container according to an example. [Figure 5] FIG. 10 is a front view of a resin container according to a comparative example. [Figure 6] 10 is an image showing distortion when a load is applied to a resin container according to a comparative example. [Figure 7] FIG. 10 is a perspective view of a resin container according to a second embodiment. [Figure 8] FIG. 10 is a front view of a resin container according to a second embodiment. [Figure 9] FIG. 10 is a right side view of a resin container according to a second embodiment. [Figure 10] FIG. 10 is a left side view of a resin container according to a second embodiment. [Figure 11] FIG. 10 is a rear view of the resin container according to the second embodiment. [Figure 12] 1A is a plan view of a resin container according to a second embodiment, and FIG. 1B is a bottom view of the same. [Figure 13] A is the XIIIA-XIIIA cross section of Figure 8, B is the XIIIB-XIIIB cross section of Figure 8, and C is the XIIIC-XIIIC cross section of Figure 8. [Figure 14] FIG. 10 is a partially enlarged view of a resin container according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, exemplary embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of components described in the following embodiments can be arbitrarily set and can be changed depending on the configuration or various conditions of the device or method to which the present invention is applied. Furthermore, unless otherwise specified, the scope of the present invention is not limited to the embodiments specifically described below.

[0008] For example, the contents stored in the resin container described below are beverages. Alternatively, liquids other than beverages, semi-solid gels, sols, powders, or various other substances may be stored in the resin container. However, the following description will mainly focus on resin containers filled with beverages.

[0009] For example, the resin container is made of a thermoplastic resin. One example of the thermoplastic resin is polyethylene terephthalate resin (PET). Alternatively, the thermoplastic resin may be polybutylene terephthalate resin, polyethylene naphthalate resin, polyethylene resin, polypropylene resin, cycloolefin copolymer resin, ionomer resin, poly-4-methylpentene-1 resin, polymethyl methacrylate resin, polystyrene resin, ethylene-vinyl alcohol copolymer resin, acrylonitrile resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyamide resin, polyamideimide resin, polyacetal resin, polycarbonate resin, polysulfone resin, tetrafluoroethylene resin, acrylonitrile-styrene resin, or acrylonitrile-butadiene-styrene resin.

[0010] For example, such a resin container is manufactured by a biaxial stretch blow molding method using a thermoplastic resin as a material. The capacity of the resin container, as an example, is set arbitrarily within the range of 280 mL or more and 2000 mL or less. The weight of the resin container, as an example, is set arbitrarily within the range of 14 g or more and 23 g or less. In the following description, the upward direction in the direction of gravity of the resin container in an upright position corresponds to the upper side of the resin container, and the downward direction corresponds to the lower side of the resin container.

[0011] [First embodiment] A resin container will be described with reference to Figures 1 to 3. Figure 1 is a perspective view of a bottle 10 in an upright position, viewed from above. That is, Figure 1 shows the bottle 10 with the bottom 16 located on the lower side and the mouth 12 located on the upper side. Figure 2 shows a left side view, a front view, a right side view, and a back view of the bottle 10. Figure 3 shows an enlarged view of the upper part of the front view of the bottle 10.

[0012] As shown in Figure 1, a bottle 10, which is an example of a resin container, has a mouth 12 located at the top and a bottom 16 located at the bottom. Bottle 10 also has a cylindrical body 15 located between mouth 12 and bottom 16. Bottle 10 also has a neck 13 and a shoulder 14 located between mouth 12 and body 15.

[0013] The body 15 extends in the axial direction of the bottle 10. Here, the axial direction is the direction in which an axis AX (FIG. 2) passing through the center of the bottle 10 extends. The up-and-down direction of the bottle 10 corresponds to the axial direction, and the axial direction of the body 15 coincides with the axial direction of the bottle 10. The direction revolving around the axis AX extending in the axial direction of the bottle 10 corresponds to the circumferential direction of the bottle 10. The circumferential direction of the body 15 coincides with the circumferential direction of the bottle 10.

[0014] The mouth portion 12 has a relatively small diameter and a cylindrical shape extending in the axial direction. A male thread portion 12a is formed on the outer periphery of the mouth portion 12 for attaching a cap (not shown). The neck portion 13 extends continuously from the lower end of the neck ring 13a toward the shoulder portion 14. The shoulder portion 14 extends continuously from the lower end of the neck portion 13 toward the body portion 15, gradually increasing in diameter. The body portion 15 has a cylindrical shape and extends continuously from the lower end of the shoulder portion 14 downward in the axial direction toward the bottom portion 16.

[0015] As an example, the body 15 has a rectangular cylindrical shape in which the cross section horizontally orthogonal to the axis AX is generally rectangular. Alternatively, the body 15 may have a cylindrical shape in which the cross section is generally circular. Furthermore, the cross section of the body 15 may have a polygonal shape other than a rectangle, or may be non-circular, such as an ellipse or an oval.

[0016] The body 15 shown in Fig. 1 has a shape that combines four outer peripheral surfaces 15a and four corners 15b located at the boundaries of the outer peripheral surfaces 15a. Therefore, the body 15 has a shape in which the four outer peripheral surfaces 15a extending along each side of an imaginary rectangle are connected to each other via the corners 15b. Each corner 15b has a so-called rounded shape with an appropriate curvature. Alternatively, each corner 15b may have a shape in which the boundaries between the outer peripheral surfaces 15a are connected by a plane with a certain inclination (a so-called chamfered shape).

[0017] The bottom 16 is continuous with the lower end of the body 15 and has a bottom lid-like shape that closes the lower end of the bottle 10. A plurality of groove-like bottom ribs are formed in the bottom 16 for the purpose of reinforcing the bottom 16. For example, the plurality of bottom ribs extend radially from a recess in the center of the bottom 16, or are formed concentrically from the center of the bottom 16. Alternatively, the bottom ribs may not be formed in the bottom 16.

[0018] 2, the mouth 12, neck 13, shoulder 14, body 15, and bottom 16 are positioned coaxially aligned on a common axis AX. Therefore, the axis AX corresponds to the overall axis of the bottle 10 and coincides with the axis of the body 15.

[0019] [Rib 20] As shown in FIG. 1 , multiple ribs 20 are formed on the body 15 for the purpose of reinforcing the bottle 10. As an example, five ribs 20 are formed on the body 15. However, the number of ribs 20 may be two or more, and may be three, four, six or more. Each rib 20 is a groove that protrudes inward from the bottle 10 and extends circumferentially. That is, each rib 20 bulges inward from the outer peripheral surface 15a that defines the contour of the body 15.

[0020] Alternatively, each rib 20 may be a convex portion or ridge that protrudes outward from the bottle 10 and extends circumferentially. This shape can also provide reinforcement for the body 15. Furthermore, compared to groove-shaped ribs 20 that protrude inward, this shape can prevent the content volume of the bottle 10 from decreasing. However, if the ribs 20 are grooves, it can prevent the outward-protruding ribs 20 from coming into contact with each other when multiple bottles 10 are stored or transported.

[0021] As an example, the protruding length of the ribs 20 is set arbitrarily within the range of 0.4 mm or more and 5 mm or less. The width of the ribs 20, i.e., the length in the axial direction, is constant around the entire circumference of the body portion 15. Alternatively, wide portions where the width of the ribs 20 is relatively large may be formed as appropriate. The ribs 20 may also be formed so as to go around the body portion 15 while varying the width of the ribs 20 partially. The size, position, and number of the ribs 20 may be set as appropriate depending on the specifications of the body portion 15, such as the axial length, diameter, and thickness.

[0022] Furthermore, the plurality of ribs 20 includes a pair of ribs. Specifically, among the plurality of ribs 20, two ribs 20 aligned in the axial direction constitute a pair of ribs. The pair of ribs includes an upper rib 21 and a lower rib 22. The upper rib 21 and the lower rib 22 extend in the circumferential direction of the body portion 15. In the example of FIG. 1, the upper rib 21 and the lower rib 22 extend so as to go around the body portion 15. However, the upper rib 21 and the lower rib 22 may extend only in a partial region in the circumferential direction of the body portion 15. In this case, the plurality of upper ribs 21 may be formed intermittently in the circumferential direction. In addition, the plurality of lower ribs 22 may be formed intermittently in the circumferential direction. In the example of FIG. 1, reference symbols are assigned to the pair of ribs formed by the uppermost upper rib 21 and the lower rib 22 aligned with the upper rib 21 in the axial direction.

[0023] For example, at least two pairs of ribs are formed in the body portion 15. This allows the load to be applied to be more dispersed. Specifically, in the example of FIG. 1, four pairs of ribs are formed, each consisting of any two ribs 20 lined up in the axial direction from among the five ribs 20. That is, from top to bottom, a first pair of the first and second ribs 20, a second pair of the second and third ribs 20, a third pair of the third and fourth ribs 20, and a fourth pair of the fourth and fifth ribs 20 are formed. Note that there may be three, five, or more pairs of ribs.

[0024] A pair of ribs is formed by one and the other of two ribs 20 aligned in the axial direction. For example, the rib 20 located second from the top corresponds to the lower rib 22 in relation to the uppermost rib 20. On the other hand, the rib 20 located second from the top corresponds to the upper rib 21 in relation to the rib 20 located third from the top. The following explanation focuses on the pair of ribs formed by the upper rib 21 and the lower rib 22 shown in FIG. 1. However, the same explanation applies to any pair of ribs formed from multiple ribs 20.

[0025] The ribs 20 have a shape in which upward convex shapes and downward convex shapes are alternately repeated at the corners 15b. That is, at the corners 15b, downward convex portions S1 and upward convex portions S2 appear alternately from top to bottom. Specifically, downward convex portions S1 of the upper rib 21 and upward convex portions S2 of the lower rib 22 appear alternately from top to bottom. Note that as long as the upward and downward convex shapes are repeated, the upward convex portion S2 of the uppermost upper rib 21 may appear at the corners 15b.

[0026] 2, a pair of ribs consisting of upper rib 21 and lower rib 22 has portions that are relatively far apart and portions that are relatively close apart. That is, each of upper rib 21 and lower rib 22 has portions that are largely curved and portions that are slightly curved. Furthermore, each of upper rib 21 and lower rib 22 has a shape that alternates between upward convex shapes and downward convex shapes.

[0027] Specifically, the upper rib 21 has a first upper portion 21a having an upwardly convex shape and a second upper portion 21b having an upwardly convex shape. The lower rib 22 has a first lower portion 22a having a downwardly convex shape and a second lower portion 22b having a downwardly convex shape. Here, in the upwardly convex shape, the upper end is located on the upper side in the axial direction, and the rib extends in a downward slope. In the downwardly convex shape, the lower end is located on the lower side in the axial direction, and the rib extends in an upward slope.

[0028] The upper rib 21 and the lower rib 22 may be formed in a limited area in the circumferential direction of the body portion 15. In this case, the upper rib 21 formed in the limited area has at least one first upper portion 21a and at least one second upper portion 21b. The lower rib 22 formed in the limited area has at least one first lower portion 22a and at least one second lower portion 22b.

[0029] Each convex shape is curved upward or downward like an arc having a predetermined radius of curvature, and is symmetrical with respect to an imaginary straight line passing through the upper or lower end. That is, the upward convex shape extends while curving from the upper end. The downward convex shape extends while curving from the lower end. The first upper portion 21a and the first lower portion 22a are aligned along the axial direction of the body 15. The second upper portion 21b and the second lower portion 22b are aligned along the axial direction of the body 15. Alternatively, a portion of each convex shape may be linear. For example, a portion connecting an upward convex shape and a downward convex shape may be linear.

[0030] In a pair of ribs consisting of an upper rib 21 and a lower rib 22, the first upper portion 21a and the first lower portion 22a correspond to portions that are relatively far apart. The second upper portion 21b and the second lower portion 22b also correspond to portions that are relatively far apart. However, the second upper portion 21b and the second lower portion 22b are closer to each other than the distance from the first upper portion 21a to the first lower portion 22a. Alternatively, the upper rib 21 and the lower rib 22 may be spaced apart by the same length in both portions.

[0031] Now, compare the front view of bottle 10 in Figure 2 with the left side view or right side view. In the portion of upper rib 21 extending from the front to the right side, two first upper portions 21a are adjacent to each other with a downward convex shape sandwiched between them. Meanwhile, in the portion of upper rib 21 extending from the front to the left side, two second upper portions 21b are adjacent to each other with a downward convex shape sandwiched between them. Similarly, in the portion of lower rib 22 extending from the front to the right side, two first lower portions 22a are adjacent to each other with an upward convex shape sandwiched between them. Meanwhile, in the portion of lower rib 22 extending from the front to the left side, two second lower portions 22b are adjacent to each other with an upward convex shape sandwiched between them.

[0032] In this way, of the relatively widely separated portions, the portions that are more widely separated are adjacent to each other through one of the left and right corners 15b. Also, of the relatively widely separated portions, the portions that are less widely separated are adjacent to each other through the other of the left and right corners 15b. Alternatively, in the portion of the upper rib 21 extending from the front to the right or left side, the first upper portion 21a and the second upper portion 21b may be adjacent to each other with a downwardly convex shape sandwiched between them. Also, in the portion of the lower rib 22 extending from the front to the right or left side, the first lower portion 22a and the second lower portion 22b may be adjacent to each other with an upwardly convex shape sandwiched between them.

[0033] The upper rib 21 also has a third upper portion 21c having a downwardly convex shape. This third upper portion 21c is continuous with the first upper portion 21a and the second upper portion 21b. That is, the third upper portion 21c is connected to the first upper portion 21a and the second upper portion 21b. The lower rib 22 also has a third lower portion 22c having an upwardly convex shape. This third lower portion 22c is continuous with the first lower portion 22a and the second lower portion 22b. The pair of the third upper portion 21c and the third lower portion 22c has a different rib formation position from the pair of the first upper portion 21a and the first lower portion 22a and the pair of the second upper portion 21b and the second lower portion 22b. Therefore, the load is applied to different parts around the three sets, allowing the load to be distributed.

[0034] As shown in the front view and right side view of FIG. 2 , the upper rib 21 has two first upper portions 21a adjacent to each other in the circumferential direction. The upper rib 21 also has a fourth upper portion 21d that is continuous with each of the adjacent first upper portions 21a and has a downwardly convex shape. The lower rib 22 also has two first lower portions 22a adjacent to each other in the circumferential direction. The lower rib 22 also has a fourth lower portion 22d that is continuous with each of the adjacent first lower portions 22a and has an upwardly convex shape. The pair of the fourth upper portion 21d and the fourth lower portion 22d is formed at a different rib position than the pair of the first upper portion 21a and the first lower portion 22a and the pair of the second upper portion 21b and the second lower portion 22b. Therefore, the load is applied to different areas around the three pairs, allowing the load to be distributed.

[0035] In a pair of ribs consisting of the upper rib 21 and the lower rib 22, the third upper portion 21c and the third lower portion 22c correspond to portions that are relatively closely spaced apart. The fourth upper portion 21d and the fourth lower portion 22d also correspond to portions that are relatively closely spaced apart. However, the third upper portion 21c and the third lower portion 22c are spaced apart less than the distance from the fourth upper portion 21d to the fourth lower portion 22d. Alternatively, the upper rib 21 and the lower rib 22 may be spaced apart by the same distance in both portions.

[0036] As shown in the left side view, front view, right side view, and rear view of FIG. 2, the number of first upper portions 21a and second upper portions 21b formed on each surface (i.e., each outer peripheral surface 15a) is the same, one each. The number of first lower portions 22a and second lower portions 22b formed on each surface is also the same, one each. The number of third upper portions 21c and fourth upper portions 21d formed on each surface is also the same, one each. The number of third lower portions 22c and fourth lower portions 22d formed on each surface is also the same, one each.

[0037] The distance from the upper rib 21 to the lower rib 22 will be described in more detail with reference to Figure 3. In Figure 3, the line connecting points located in the middle of the circumferentially extending edges of the upper rib 21 is defined as the center line C1. That is, the center line C1 is located equidistant from both edges of the upper rib 21. Also, the line connecting points located in the middle of the circumferentially extending edges of the lower rib 22 is defined as the center line C2. That is, the center line C2 is located equidistant from both edges of the lower rib 22. The center line C1 corresponds to the bottom of the groove-shaped upper rib 21. Also, the center line C2 corresponds to the bottom of the groove-shaped lower rib 22.

[0038] The vertices of the upward and downward convex shapes of the upper rib 21 are defined as being located on the center line C1. The vertices of the upward and downward convex shapes of the lower rib 22 are defined as being located on the center line C2. Here, the vertex of the upward convex shape corresponds to the upper end, and the vertex of the downward convex shape corresponds to the lower end. Furthermore, the distance from the first upper vertex P1a of the first upper portion 21a to the first lower vertex P2a of the first lower portion 22a is defined as distance D1.

[0039] The distance from the second upper vertex P1b of the second upper portion 21b, which is closest to the first upper portion 21a in the circumferential direction, to the second lower vertex P2b of the second lower portion 22b, which is closest to the first lower portion 22a in the circumferential direction, is defined as distance D2. Here, distance D1 is longer than distance D2. As a result, the rib formation positions of the pair of the first upper portion 21a and the first lower portion 22a and the pair of the second upper portion 21b and the second lower portion 22b are different in the axial direction. Therefore, the load is applied to different areas around the two pairs, allowing the load to be distributed. The first upper vertex P1a and the first lower vertex P2a are aligned on a straight line parallel to the axis AX. The second upper vertex P1b and the second lower vertex P2b are aligned on a straight line parallel to the axis AX.

[0040] Furthermore, the distance from the third upper vertex P1c of the third upper portion 21c to the third lower vertex P2c of the third lower portion 22c is defined as distance D3. The distance from the fourth upper vertex P1d of the fourth upper portion 21d to the fourth lower vertex P2d of the fourth lower portion 22d is defined as distance D4. Here, distance D3 is shorter than distance D4. As a result, the rib formation positions of the pair of the third upper portion 21c and the third lower portion 22c and the pair of the fourth upper portion 21d and the fourth lower portion 22d are different in the axial direction. Therefore, the load is applied to different areas around the two pairs, allowing the load to be distributed. Note that distance D2 is longer than distance D4.

[0041] As another example, distance D1 may be the same as distance D2, and distance D3 may be the same as distance D4. The third upper vertex P1c and the third lower vertex P2c are aligned on a line parallel to the axis AX. The fourth upper vertex P1d and the fourth lower vertex P2d are aligned on a line parallel to the axis AX.

[0042] The third upper portion 21c and the third lower portion 22c are aligned along the axial direction at at least one corner 15b of the body 15. The fourth upper portion 21d and the fourth lower portion 22d are aligned along the axial direction at at least one corner 15b of the body 15. Specifically, the upper rib 21 and the lower rib 22 are shaped such that the third upper vertex P1c and the third lower vertex P2c are located at at least one corner 15b. The upper rib 21 and the lower rib 22 are shaped such that the fourth upper vertex P1d and the fourth lower vertex P2d are located at at least one corner 15b.

[0043] In bottle 10 having a rectangular cylindrical body 15, corners 15b tend to act as columnar structural parts and bear vertical compressive loads. By positioning the convex apex at corner 15b, the load applied to corner 15b can be dispersed to the outer peripheral surface 15a on both sides of corner 15b. This further improves the resistance and strength of bottle 10 to vertical compressive loads.

[0044] The ribs 20 described above distribute the load across the entire bottle 10, allowing the load to be received by the entire bottle 10. This improves the buckling strength of the bottle 10, preventing deformation of the bottle 10. Furthermore, the ribs 20 suppress deformation when gripped, making the bottle 10 easier to grip.

[0045] Furthermore, roll labels, which are thinner than shrink labels, can be attached to the body 15 of the bottle 10. For example, when attaching a roll label to the bottle 10, a hot-melt adhesive is applied to the body 15. This requires securing an area for applying the adhesive to the body 15. However, attempting to secure an area for application places restrictions on the shape of the bottle 10, making it difficult to distribute the load.

[0046] For example, if horizontal ribs with uniform protrusion lengths are formed horizontally in the circumferential direction, deformation may occur starting from the horizontal ribs when a load is applied from above the plastic container. Furthermore, when a shrink label is attached, it is attached to the plastic container by heat shrinking it. Therefore, if such horizontal ribs are formed, the shrink label will sink into the horizontal ribs, detracting from the aesthetic appeal.

[0047] Meanwhile, the rib 20 has a shape that improves buckling strength, prevents deformation, and makes the bottle 10 easier to grip, while maintaining the application area. Specifically, the upper rib 21 has a first upper portion 21a and a second upper portion 21b so as to alternately form upward and downward convex shapes. The lower rib 22 has a first lower portion 22a and a second lower portion 22b so as to alternately form upward and downward convex shapes. This makes it possible to prevent deformation of the bottle 10 starting from the rib 20, compared to horizontal ribs.

[0048] For example, when the bottle 10 is stored in a warehouse, the load can be distributed to prevent problems caused by deformation, and the contents of the bottle 10 can also be prevented from boiling over. Furthermore, when a shrink label is used, the shrink label can be prevented from getting caught in the ribs 20. This prevents or avoids impairing the aesthetic appeal of the bottle 10. Furthermore, the rigidity of the bottle 10 is improved in the areas where the ribs 20 are formed. This makes the bottle 10 less likely to be crushed when gripped, making it easier to hold. Furthermore, deformation when gripped can be prevented, reducing the occurrence of boiling over of the contents.

[0049] [Example] 4 to 6, a bottle 10 according to an example corresponding to the first embodiment is compared with a bottle 100 according to a comparative example. FIG. 4 is an image showing the distortion of the bottle 10 when a compressive load is applied from above. In this example image, a compressive load is applied to a bottle 10 placed upright with liquid inside. Specifically, a cap is attached to the mouth 12, and a compressive load is applied vertically downward from the top surface of the cap. Furthermore, an image of the bottle 10 to which the compressive load has been applied is taken, and the distortion of the bottle 10 is visualized by image analysis.

[0050] As shown in FIG. 5, the bottle 100 according to the comparative example has a body 115. The body 115 has multiple groove-shaped horizontal ribs 120 formed therein. The multiple horizontal ribs 120 run circumferentially around the body 115 and are parallel to one another. The width and protrusion amount of the multiple horizontal ribs 120 are constant around the entire circumference. FIG. 6 is an image showing the distortion of the bottle 100 when a compressive load is applied to the bottle 100 from above. Note that the conditions and method for visualizing the distortion are the same as those in FIG. 4, and therefore a description thereof will be omitted.

[0051] As shown in FIG. 4, in the bottle 10, the positions of the additional portions LD1 to LD5, which are subject to large strain due to the application of a load, are dispersed. That is, the positions of the additional portions LD are adjusted so that the positions of the additional portions LD on the body 15 are not biased. The position, shape, and size of each rib 20 are set for the purpose of such adjustment. Specifically, the additional portions LD to which the load is applied are positioned so as to be staggered. That is, the positions of the additional portions LD are adjusted so as to be shifted left and right along the axial direction. For example, when comparing the additional portions LD1 and LD2, which are adjacent to each other, the additional portion LD1 is biased to the right in the figure, and the additional portion LD2 is biased to the left in the figure.

[0052] Therefore, the distance between adjacent additional portions LD is longer than when adjacent additional portions LD are aligned on a virtual straight line parallel to the axial direction. Therefore, the load can be dispersed over a long distance. This reduces deformation in the body 15. That is, the bottle 10 equipped with the ribs 20 can withstand relatively strong loads. In particular, the ribs 20 can provide a greater reinforcing effect against vertical compressive loads acting along the axis AX of the bottle 10. This reduces the possibility of deformation, such as bending the ribs 20 inward due to concentrated loads. This significantly improves the strength and resistance of the bottle 10 to buckling deformation caused by vertical compressive loads.

[0053] [Comparative Example] On the other hand, as shown in FIG. 6, in the bottle 100 according to the comparative example, the additional portions LD6 to LD10, which are subject to large strain due to the application of a load, are aligned on an imaginary straight line parallel to the axial direction. In other words, the load is concentrated at specific points on this straight line. Therefore, deformation is likely to occur in the area where the load is concentrated. In other words, the bottle 100 equipped with the horizontal rib 120 buckles even when a relatively small load is applied.

[0054] [Label attachment] The attachment of a label will be described with reference to the rear view of Figure 2. In the following, as an example of a label, a roll label that is attached to the body 15 using an adhesive will be mainly described. One end of this roll label is fixed by adhesive applied to the body 15 of the bottle 10. Then, with the roll label wrapped around the body 15, both ends of the roll label are adhered to each other. In this way, the roll label is attached to the bottle 10. As an example, the adhesive is a hot-melt adhesive that melts when heated.

[0055] The body 15 has a recessed area 15s formed around the entire body 15 as an example of an area where a label is attached. This recessed area 15s is slightly recessed inward compared to the outline of the bottle 10 and protrudes inward by a predetermined protrusion length. For example, the recessed area 15s is recessed so as to protrude inward by 0.2 mm. This prevents the labels of two adjacent bottles 10 from coming into contact with each other when transporting or storing labeled bottles 10. This prevents the labels from being soiled or damaged. The upper boundary of the recessed area 15s is defined by a step formed by the upper boundary 41. The lower boundary of the recessed area 15s is defined by a step formed by the lower boundary 42.

[0056] The upper boundary 41 and the lower boundary 42 correspond to peripheral edges that protrude outward relative to the recess region 15s. The upper boundary 41 and the lower boundary 42 extend in the circumferential direction so as to go around the body portion 15. As an example, the lower boundary 42 extends horizontally in the circumferential direction. Alternatively, at least a portion of the lower boundary 42 may be curved or inclined in the axial and circumferential directions. As another example, the recess region 15s does not need to go around the body portion 15. In this case, the portion that protrudes outward relative to the recess region 15s extends in the axial direction of the body portion 15. Therefore, the upper boundary 41 and the lower boundary 42 are discontinued at the outward protruding portion.

[0057] In the recessed region 15s, adhesive is applied to the application area without any unevenness due to the ribs 20. That is, the application area is the area between the ribs 20. For example, a label covering the recessed region 15s is attached only to a limited area in the axial direction of the body 15. The application area is a continuous, smooth surface without any unevenness due to the ribs 20. In particular, the areas between the first upper portion 21a and the first lower portion 22a and the area between the second upper portion 21b and the second lower portion 22b, which are relatively far apart, can be used as application areas. This ensures a smooth surface with a certain extent, allowing the roll label to be adhered to a wide application area. The multiple application areas are arranged linearly in the axial direction. Alternatively, multiple application areas may be arranged at different positions in the circumferential direction.

[0058] One circumferential end of the roll label is adhered to the body 15 in the application area. The other end of the roll label wound around the body 15 is then overlapped and adhered to the one end adhered to the body 15. For example, when applying adhesive, the bottle 10 is rotated around the axis AX relative to an application roller. This brings the body 15 into contact with the roller, allowing the adhesive to be applied to the application area on any one of the multiple outer circumferential surfaces 15a.

[0059] 2, the recessed region 15s is provided over the entire body portion 15 in the axial direction, from the shoulder portion 14 to the bottom portion 16. However, the recessed region 15s may be provided only in a part of the body portion 15 in the axial direction. For example, the recessed region 15s may be provided in an upper region of the body portion 15, a central region of the body portion 15, or a region of the body portion 15 excluding the lower portion.

[0060] As another example, a shrink label made of a shrink film that utilizes heat shrinkage may be attached to the body portion 15. Here, each rib 20 has upward and downward convex shapes that alternate in the circumferential direction. That is, each rib 20 extends in a meandering manner in the circumferential direction in the recessed region 15s. Therefore, compared to horizontal ribs that extend horizontally, the shrink label is less likely to slip inside the ribs 20 after shrinking. This can prevent or avoid impairing the aesthetic appeal of the shrink label.

[0061] As described above, the bottle 10 according to the first embodiment allows for distributed application of loads. Therefore, the bottle 10 and the ribs 20 can be designed to prevent the load from concentrating on a specific location. This improves the resistance and strength of the bottle 10 to vertical compressive loads. As a result, the buckling strength of the bottle 10 is improved, preventing deformation of the bottle 10.

[0062] Furthermore, the ribs 20 suppress deformation when gripped, making the bottle 10 easier to grip. When a roll label is attached, an application area can be secured on the body 15. Additionally, when a shrink label is used, the ribs 20 make it difficult for the shrink label to get caught in the ribs. This prevents the aesthetic appeal of the bottle 10 from being impaired.

[0063] 2, the first upper portion 21a and the first lower portion 22a are aligned on a straight line parallel to the axis AX. The second upper portion 21b and the second lower portion 22b are aligned on a straight line parallel to the axis AX. However, the first lower portion 22a may be slightly offset in the circumferential direction with respect to the first upper portion 21a. The second lower portion 22b may be slightly offset in the circumferential direction with respect to the second upper portion 21b.

[0064] [Second embodiment] Next, a second embodiment will be described with reference to Figures 7 to 13. A bottle 210 according to the second embodiment differs from the first embodiment in that it is provided with a peripheral rib 30. Furthermore, the bottle 210 does not have an upper boundary 41, and no step is formed at the top end of the area where the label is attached.

[0065] Fig. 7 is a perspective view of bottle 210 as seen from above, and Fig. 8 is a front view of bottle 210. Fig. 9 is a right side view of bottle 210, and Fig. 10 is a left side view of bottle 210. Fig. 11 is a rear view of bottle 210, Fig. 12A is a plan view of bottle 210, and Fig. 12B is a bottom view of bottle 210. Fig. 13 is a cross-sectional view of bottle 210. Fig. 13A shows the XIIIA-XIIIA cross section in Fig. 8. Fig. 13B shows the XIIIB-XIIIB cross section in Fig. 8. Fig. 13C shows the XIIIC-XIIIC cross section in Fig. 8.

[0066] In the description of the second embodiment, differences from the first embodiment will be described, and the same reference numerals will be used for components that have already been described, and their description may be omitted. Unless otherwise specified, components with the same reference numerals perform substantially the same operations and functions, and their effects are also substantially the same.

[0067] As shown in FIG. 7, a bottle 210, which is an example of a resin container, has a mouth 12 located at the top and a bottom 16 located at the bottom. The bottle 210 also has a cylindrical body 15 located between the mouth 12 and the bottom 16. The bottle 210 also has a neck 13 and a shoulder 14 located between the mouth 12 and the body 15. The capacity of the bottle 210 shown in FIG. 7 is 500 mL. However, the capacity of the bottle 210 is not limited to 500 mL. The material of the bottle 210 is polyethylene terephthalate resin. However, the material of the bottle 210 is not limited to polyethylene terephthalate resin.

[0068] The body portion 15 has a shape that combines four outer peripheral surfaces 15a and four corners 15b located at the boundaries of the outer peripheral surfaces 15a. The body portion 15 has a rectangular cylindrical shape with a generally rectangular cross section. Alternatively, the body portion 15 may have a cylindrical shape with a generally circular cross section. Furthermore, the cross section of the body portion 15 may have a polygonal shape other than a rectangle, or may be non-circular, such as an ellipse or an oval.

[0069] The body 15 extends in the axial direction of the bottle 210. Here, the axial direction is the direction in which an axis AX passing through the center of the bottle 210 shown in FIG. 8 extends. The up-and-down direction of the bottle 210 corresponds to the axial direction, and the axial direction of the body 15 coincides with the axial direction of the bottle 210. Furthermore, the direction revolving around the axis AX extending in the axial direction of the bottle 210 corresponds to the circumferential direction of the bottle 210. The circumferential direction of the body 15 coincides with the circumferential direction of the bottle 210. A protrusion 60 having a downward convex shape is formed on the shoulder 14. A label is attached to the underside of this protrusion 60. The protrusion 60 has an arc-shaped shape and protrudes outward from the shoulder 14.

[0070] As shown in FIGS. 8 to 11, the body 15 has a pair of ribs including an upper rib 21 and a lower rib 22 that extend circumferentially around the body 15. The upper rib 21 has a first upper portion 21a and a second upper portion 21b that have an upwardly convex shape. The lower rib 22 has a first lower portion 22a and a second lower portion 22b that have a downwardly convex shape. The first upper portion 21a and the first lower portion 22a are aligned along the axial direction of the body 15. The second upper portion 21b and the second lower portion 22b are aligned along the axial direction.

[0071] The upper rib 21 also has a third upper portion 21c having a downwardly convex shape. This third upper portion 21c is continuous with the first upper portion 21a and the second upper portion 21b. The lower rib 22 also has a third lower portion 22c having an upwardly convex shape. This third lower portion 22c is continuous with the first lower portion 22a and the second lower portion 22b. The upper rib 21 also has a fourth upper portion 21d that is continuous with each of the adjacent first upper portions 21a and has a downwardly convex shape. The lower rib 22 also has a fourth lower portion 22d that is continuous with each of the adjacent first lower portions 22a and has an upwardly convex shape.

[0072] 12A, the mouth 12 and shoulder 14 are coaxial with the axis AX of the bottle 210. Furthermore, as shown in FIG. 12B, the bottom 16 has a plurality of bottom ribs 16b formed concentrically from the center 16a of the bottom 16. The center 16a of the bottom 16 is located on the axis AX of the bottle 210.

[0073] [Peripheral rib 30] Returning to Figure 8, the body 15 is formed with peripheral ribs 30 that extend circumferentially around the body 15 to reinforce the bottle 210. As an example, five peripheral ribs 30 are formed on the body 15. However, the size, position, and number of the peripheral ribs 30 can be set appropriately depending on the specifications of the body 15, such as the axial length, diameter, and thickness. For example, the number of peripheral ribs 30 may be one or more.

[0074] Furthermore, the distance between the center lines CL of the peripheral ribs 30 is at least partially different between the upper set of two peripheral ribs 30 and the lower set of three peripheral ribs 30. Alternatively, the multiple peripheral ribs 30 may be formed evenly spaced apart in the axial direction. That is, the distance between the center lines CL of the peripheral ribs 30 may all be the same. Furthermore, each peripheral rib 30 extends horizontally in the circumferential direction. However, each peripheral rib 30 may be inclined in both the axial and circumferential directions.

[0075] Each peripheral rib 30 is a groove that protrudes inward from the bottle 210 and extends circumferentially. That is, each peripheral rib 30 bulges inward from the outer peripheral surface 15a that defines the contour of the body 15. Alternatively, each peripheral rib 30 may be a convex or ridge that protrudes outward from the bottle 210 and extends circumferentially. This shape can also reinforce the body 15. Furthermore, compared to a groove-shaped peripheral rib 30 that protrudes inward, this shape can prevent the content volume of the bottle 210 from decreasing. However, if the peripheral rib 30 is a groove, it can prevent the outward-protruding peripheral ribs 30 from coming into contact with each other when storing or transporting multiple bottles 210.

[0076] As shown in Figure 13, the rib contour 30c defined by the center line CL (Figure 8) of the peripheral rib 30 is similar in shape to the body contour 15c defined by the outer peripheral surface 15a on which the peripheral rib 30 is formed. In addition, when viewed from below the bottle 210, the orientation of the rib contour 30c is offset from the orientation of the body contour 15c. That is, when viewed from below in a direction perpendicular to a cross section of the bottle 210 passing through the center line CL of the peripheral rib 30, the orientation of the rib contour 30c in the cross section is tilted. Here, the body contour 15c is a surface located outside the edge of the peripheral rib 30 and coincides with the contour of a surface that is flush with the outer peripheral surface 15a.

[0077] 13, the bottom side of the drawing corresponds to the front. The center line CL is a line that traces the bottom of the groove-shaped peripheral rib 30. Here, the center line CL is defined as a line that connects points located in the middle of the edges extending in the circumferential direction of the peripheral rib 30. In other words, the center line CL is located equidistant from both edges of the peripheral rib 30.

[0078] In Figure 13, the rib contour 30c is located inside the body contour 15c, i.e., at a position offset inward of the bottle 210 relative to the outer circumferential surface 15a. Furthermore, the rib contour 30c is similar in shape to the body contour 15c, and in the example of Figure 13, the rib contour 30c and the body contour 15c are both rectangular. Alternatively, the center line CL may be a line tracing the apex of the convex outer circumferential rib 30 that protrudes inward of the bottle 210. In this case, the rib contour 30c is located outside the body contour 15c, i.e., at a position offset outward of the bottle 210 relative to the outer circumferential surface 15a.

[0079] The orientation of the rib contour 30c is offset from the orientation of the trunk contour 15c so that the rib contour 30c is inclined relative to the trunk contour 15c. In the examples of Figures 13A and 13C, the rib contour 30c is inclined clockwise by θ1 around the axis AX. In the example of Figure 13B, the rib contour 30c is inclined counterclockwise by θ2 around the axis AX. As an example, the magnitudes of θ1 and θ2 are set arbitrarily within a range of 1 degree or more and 5 degrees or less.

[0080] Because the orientation of the rib contours 30c is offset, the protruding length of the peripheral rib 30 varies along the center line CL of the peripheral rib 30. Specifically, the protruding length of the peripheral rib 30 continuously varies from a maximum portion 31 having the maximum protruding length to a minimum portion 32 having the minimum protruding length. This prevents steps from occurring within the peripheral rib 30, thereby preventing the peripheral rib 30 from being subjected to concentrated loads. When the peripheral rib 30 is a groove, the maximum portion 31 is the deepest and the minimum portion 32 is the shallowest. For example, the maximum protruding length is set arbitrarily within the range of 0.4 mm to 5 mm. The minimum protruding length is calculated by multiplying the maximum protruding length by a factor arbitrarily set within the range of 0.8 to 0.4. Alternatively, when the peripheral rib 30 is a convex portion, the maximum portion 31 is the highest and the minimum portion 32 is the lowest.

[0081] At the maximum portion 31, the distance from the rib contour 30c to the body contour 15c is the longest. That is, the distance from the rib contour 30c to the outer peripheral surface 15a or the edge of the outer peripheral rib 30 is the longest. At the minimum portion 32, the distance from the rib contour 30c to the body contour 15c is the shortest. That is, the distance from the rib contour 30c to the outer peripheral surface 15a or the edge of the outer peripheral rib 30 is the shortest. Here, the rib contour 30c is similar in shape to the body contour 15c, but the orientation of the rib contour 30c is shifted. As a result, the outer peripheral rib 30 has a shape that repeats a pattern of change in protrusion length from the maximum portion 31 to the minimum portion 32. This allows the position of the portion to which a load is applied to be shifted circumferentially throughout the entire outer circumference of the bottle 10, thereby dispersing the load.

[0082] 13A, the rib contour 30c gradually moves away from the body contour 15c in the clockwise direction, starting from the minimum portion 32. Conversely, the rib contour 30c gradually moves closer to the body contour 15c in the counterclockwise direction, starting from the maximum portion 31. Also, in the example shown in FIG. 13B, the rib contour 30c gradually moves closer to the body contour 15c in the clockwise direction, starting from the maximum portion 31. Conversely, the rib contour 30c gradually moves away from the body contour 15c in the counterclockwise direction, starting from the minimum portion 32. In this way, the circumferential rib 30 repeats a periodic pattern of change in protrusion length from the maximum portion 31 to the minimum portion 32.

[0083] Alternatively, the pattern of change in the protrusion length of at least one circumferential rib 30 from the maximum portion 31 to the minimum portion 32 may be different from that of the other circumferential ribs 30. For example, the protrusion length of at least one of the maximum portion 31 and the minimum portion 32 of at least one circumferential rib 30 may be different from that of the other circumferential ribs 30. Alternatively, the change in the protrusion length of at least one circumferential rib 30 from the maximum portion 31 to the minimum portion 32 may be more gradual or more abrupt than that of the other circumferential ribs 30.

[0084] Additionally, the body portion 15 has two peripheral ribs 30 adjacent to each other in the axial direction of the body portion 15. That is, one of the multiple peripheral ribs 30 has another peripheral rib 30 formed at least either above or below it. The orientation of the rib contour 30c of one of the two adjacent peripheral ribs 30 is shifted relative to the orientation of the rib contour 30c of the other adjacent peripheral rib 30. This allows the position of the portion to which a load is applied to be shifted in the circumferential direction, thereby dispersing the load.

[0085] For example, with reference to the lower set of three circumferential ribs 30, the topmost rib profile 30c shown in FIG. 13A is inclined clockwise by θ1. The second-highest rib profile 30c shown in FIG. 13B is inclined counterclockwise by θ2. Thus, the orientation of one of the rib profiles 30c of two adjacent circumferential ribs 30 is offset from the orientation of the other rib profile 30c of the adjacent circumferential rib 30. The second-highest rib profile 30c shown in FIG. 13B is inclined counterclockwise by θ2. The third-highest rib profile 30c shown in FIG. 13C is inclined clockwise by θ1. Alternatively, all of the rib profiles 30c may be oriented in the same direction.

[0086] Due to this misalignment, the protruding lengths of adjacent portions of the multiple axially adjacent peripheral ribs 30 differ from each other. Therefore, the minimum portions 32 of the axially adjacent peripheral ribs 30 are not aligned in the axial direction. Also, the maximum portions 31 of the axially adjacent peripheral ribs 30 are not aligned in the axial direction. This allows the load to be dispersed and not concentrated.

[0087] The body 15 also has at least three circumferential ribs 30 aligned in the axial direction. Among the at least three circumferential ribs 30, the orientation of the rib contours 30c of the upper and lower circumferential ribs 30 sandwiching one of the circumferential ribs 30 may be the same. For example, comparing FIGS. 13A and 13C, all rib contours 30c are oriented in the same direction and inclined by the same amount relative to the body contour 15c. That is, the orientation of the rib contour 30c shown in FIG. 13A is the same as the orientation of the rib contour 30c shown in FIG. 13C. Here, the rib contour 30c shown in FIG. 13A corresponds to the upper circumferential rib 30 relative to the circumferential rib 30 shown in FIG. 13B. The rib contour 30c shown in FIG. 13C corresponds to the lower circumferential rib 30 relative to the circumferential rib 30 shown in FIG. 13B.

[0088] In this way, the orientation of the rib contours 30c is shifted so that the same orientation appears alternately. In other words, the orientation of the rib contours 30c is shifted so that every other rib contour 30c has the same orientation. This allows the load to be distributed so that it is not concentrated in a specific location. However, the orientation of all rib contours 30c may be different. Furthermore, the orientation of the rib contours 30c may be randomly changed.

[0089] Furthermore, when focusing on the peripheral ribs 30 at the corners 15b, portions with relatively long protrusion lengths (e.g., deep grooves) and portions with relatively short protrusion lengths (e.g., shallow grooves) appear alternately in the axial direction. Note that, in at least some of the multiple peripheral ribs 30, it is sufficient that the protrusion lengths of at least two peripheral ribs 30 adjacent in the axial direction differ in the axial direction. For example, there may be a region in which the protrusion lengths of two adjacent peripheral ribs 30 in the axial direction are the same.

[0090] The peripheral rib 30 has a wide portion with a relatively large width (i.e., a length in the axial direction) and a narrow portion with a relatively small width. Specifically, the maximum width portion 31 corresponds to the wide portion, and the minimum width portion 32 corresponds to the narrow portion. The width of the peripheral rib 30 changes continuously from the wide portion to the narrow portion. Alternatively, the axial length of the peripheral rib 30 may be constant around the entire circumference of the body portion 15. For example, the widths of the maximum width portion 31 and the minimum width portion 32 may be the same, and only the protruding length may differ.

[0091] Furthermore, in the body portion 15, the maximum portion 31 of one of the axially adjacent peripheral ribs 30 is located at a different circumferential position from the maximum portion 31 of the other adjacent peripheral rib 30. In other words, the maximum portions 31 of the adjacent peripheral ribs 30 are not aligned in the axial direction. This allows the positions of the portions to which the load is applied to be shifted in the circumferential direction, thereby dispersing the load.

[0092] For example, Figure 8 shows the outer peripheral ribs 30a and 30b adjacent to each other in the axial direction. Here, the maximum portion 31a of the outer peripheral rib 30a and the maximum portion 31b of the outer peripheral rib 30b are located at different positions in the circumferential direction and are not aligned in the axial direction. This allows the load to be dispersed without being concentrated. Similarly, the minimum portion 32a of the outer peripheral rib 30a and the minimum portion 32b of the outer peripheral rib 30b are located at different positions in the circumferential direction and are not aligned in the axial direction.

[0093] The peripheral rib 30 described above allows for distributed application of loads. Therefore, the bottle 210 and the peripheral rib 30 can be designed to prevent the load from concentrating on a specific location. This improves the resistance and strength of the bottle 210 to vertical compressive loads. As a result, the buckling strength of the bottle 210 is improved, preventing deformation of the bottle 210. Furthermore, the peripheral rib 30 reduces deformation during gripping, making the bottle 210 easier to grip. Furthermore, when attaching a roll label, an application area can be secured on the body 15.

[0094] The number of peripheral ribs 30 may be one. Even in this case, the position of the portion to which the load is applied can be shifted by adjusting the inclination of the rib contour 30c of the peripheral rib 30. This allows the bottle 210 and peripheral rib 30 to be designed to prevent the load from concentrating on a specific location.

[0095] Furthermore, in the bottle 210, peripheral ribs 30 are formed on the upper and lower portions of the body 15. A pair of ribs, including an upper rib 21 and a lower rib 22, is formed in the intermediate portion between the upper peripheral rib 30 and the lower peripheral rib 30. When attaching a label, relatively important information is displayed in the intermediate portion of the body 15. For example, important information may include product information such as a logo or trademark, or quality information related to ingredients or the manufacturer. When attaching a shrink label, forming a pair of ribs that meander in the circumferential direction in the intermediate portion of the body 15 can prevent the shrink label from creeping into the intermediate portion. This prevents important information from becoming difficult to see due to the shrink label creeping in.

[0096] As described above, the bottle 210 according to the second embodiment allows for distributed application of loads. Therefore, the bottle 210, the rib 20, and the peripheral rib 30 can be designed to prevent the load from concentrating on a specific location. This improves the resistance and strength of the bottle 210 to vertical compressive loads. As a result, the buckling strength of the bottle 210 is improved, preventing deformation of the bottle 210.

[0097] Furthermore, the ribs 20 and the peripheral rib 30 suppress deformation when gripped, making the bottle 210 easier to grip. Also, when a roll label is attached, an application area can be secured on the body 15. Additionally, when a shrink label is used, the shrink label is less likely to get caught in the ribs 20. This prevents the aesthetic appeal of the bottle 210 from being impaired.

[0098] [Third embodiment] Next, a third embodiment will be described with reference to Fig. 14. A bottle 310 according to the third embodiment differs from the first and second embodiments in that it includes a protrusion 40. Fig. 14 is an enlarged view of the upper part of the bottle 310 as viewed from the front. The lower part of the body 15 of the bottle 310 is configured similarly to the bottle 10 according to the first embodiment or the bottle 210 according to the second embodiment. Therefore, for ease of explanation, the lower part of the body 15 of the bottle 310 is not shown in Fig. 14.

[0099] As described above, the body 15 has a recessed region 15s that is recessed inward. The upper boundary of the recessed region 15s is defined by a step formed by an upper boundary 41. The lower boundary of the recessed region 15s is defined by a step formed by a lower boundary 42. The upper boundary 41 includes a protrusion 40 that has a downwardly convex shape. The label is attached to cover the protrusion 40. In the example shown in FIG. 14 , the protrusion 40 has an arc-like shape. As an example, the protrusion 40 has a shape that describes an arc having a predetermined radius of curvature. This prevents corners from forming on the edge of the protrusion 40, thereby preventing the protrusion 40 from receiving a concentrated load. Alternatively, the protrusion 40 may have a shape that describes a portion of an oval. As another example, the protrusion 40 may have a portion that extends linearly.

[0100] Additionally, the upper boundary 41 includes a horizontal portion that extends horizontally in the circumferential direction. Specifically, the remaining portion excluding the protruding portion 40 is a horizontal portion, and the horizontal portion extends horizontally in the circumferential direction. This prevents the label attached to the body 15 from shifting out of position. Alternatively, the remaining portion excluding the protruding portion 40 may be curved or inclined in the axial and circumferential directions. Note that the upper boundary 41 can be omitted if unnecessary.

[0101] The upper boundary 41 also includes multiple protrusions 40 formed at equal intervals. This allows the load to be distributed evenly across each outer peripheral surface 15a of the bottle 310. For example, the distance from the apex 40a of one protrusion 40 to the apex 40a of the adjacent protrusion 40 is equal across the multiple protrusions 40. The protrusions 40 are also located between the corners 15b of the body 15. This allows the load to be distributed across the outer peripheral surface 15a. As an example, each protrusion 40 is formed at the center of the outer peripheral surface 15a in the circumferential direction. In this case, the upper boundary 41 includes the same number of protrusions 40 as the number of protrusions 40 on each outer peripheral surface 15a. Alternatively, multiple protrusions 40 may be formed on each outer peripheral surface 15a. As another example, the multiple protrusions 40 may include a pair of adjacent protrusions 40 with a different spacing between them than the other two protrusions 40.

[0102] Alternatively, the protrusion 40 may be located at a corner 15b of the body 15. This allows the load to be distributed at the corner 15b. As another example, the upper boundary 41 of at least one of the multiple outer peripheral surfaces 15a may not include the protrusion 40. For example, of the four outer peripheral surfaces 15a, only the upper boundary 41 of two outer peripheral surfaces 15a may include the protrusion 40.

[0103] As described above, the bottle 310 according to the third embodiment has protrusions 40, which can prevent deformation of the outer peripheral surface 15a or corners 15b. Specifically, the positions of the protrusions 40 can be determined so that loads are more easily applied to the upper and lower sides of the protrusions 40, distributing the load application areas. Therefore, the bottle 310 and protrusions 40 can be designed to prevent the load from concentrating on a specific location (e.g., corners 15b). This improves the resistance and strength of the bottle 10 to vertical compressive loads. As a result, the buckling strength of the bottle 310 is improved, preventing deformation of the bottle 310.

[0104] Although the present invention has been described above with reference to each embodiment, the present invention is not limited to the above-described embodiments. Inventions modified without violating the present invention, and inventions equivalent to the present invention, are also included in the present invention. Furthermore, each embodiment and each modified form, and technical means included in each embodiment or each modified form, can be combined as appropriate without violating the present invention.

[0105] For example, shoulder 14, body 15, and bottom 16 do not have to be coaxial with mouth 12 and neck 13. As an example, body 15 and bottom 16 may be eccentric with respect to axis AX.

[0106] A part or all of the above-described embodiments can be described as, but not limited to, the following supplementary notes.

[0107] (Appendix 1) A resin container having a mouth portion located on the upper side, a bottom portion located on the lower side, and a cylindrical body portion located between the mouth portion and the bottom portion, the trunk portion has a pair of ribs including an upper rib and a lower rib extending in a circumferential direction of the trunk portion, the upper rib has a first upper portion and a second upper portion each having an upwardly convex shape; the lower rib has a first lower portion and a second lower portion each having a downwardly convex shape; the first upper portion and the first lower portion are aligned along the axial direction of the body portion, A resin container, wherein the second upper portion and the second lower portion are aligned along the axial direction.

[0108] (Appendix 2) A resin container as described in Appendix 1, wherein the distance from the first upper vertex of the first upper portion to the first lower vertex of the first lower portion is longer than the distance from the second upper vertex of the second upper portion, which is closest to the first upper portion in the circumferential direction, to the second lower vertex of the second lower portion, which is closest to the first lower portion in the circumferential direction.

[0109] (Appendix 3) the upper rib has a third upper portion that is continuous with the first upper portion and the second upper portion and has a downwardly convex shape; A resin container as described in Appendix 1 or 2, wherein the lower rib has a third lower portion that is continuous with the first lower portion and the second lower portion and has an upwardly convex shape.

[0110] (Appendix 4) The body portion has a rectangular cylindrical shape, A resin container as described in Appendix 3, wherein the third upper portion and the third lower portion are aligned along the axial direction at at least one corner of the body portion.

[0111] (Appendix 5) the upper rib has the first upper portions adjacent to each other in the circumferential direction and fourth upper portions that are continuous with the adjacent first upper portions and have downwardly convex shapes, A resin container described in any one of Appendices 1 to 4, wherein the lower rib has first lower portions that are adjacent to each other in the circumferential direction and fourth lower portions that are continuous with each of the adjacent first lower portions and have an upward convex shape.

[0112] (Appendix 6) The body portion has a rectangular cylindrical shape, A resin container as described in Appendix 5, wherein the fourth upper portion and the fourth lower portion are aligned along the axial direction at at least one corner of the body portion.

[0113] (Appendix 7) A resin container according to any one of claims 1 to 6, wherein at least two pairs of ribs are formed on the body portion so as to go around the body portion.

[0114] (Appendix 8) a peripheral rib extending in the circumferential direction of the body portion is formed on the body portion so as to go around the body portion, A resin container described in any one of Appendices 1 to 7, wherein the rib contour defined by the center line of the outer peripheral rib is similar in shape to the body contour defined by the outer peripheral surface on which the outer peripheral rib is formed, and when viewed from below, the orientation of the rib contour is shifted relative to the orientation of the body contour.

[0115] (Appendix 9) the barrel portion has an inwardly recessed region; A resin container according to any one of claims 1 to 8, wherein the upper boundary of the recessed area includes a protrusion having a downward convex shape.

[0116] According to the bottle 10 of Supplementary Note 1, the load can be distributed over a wide area. Therefore, the bottle 10 and the ribs 20 can be designed to prevent the load from concentrating on a specific area. This improves the resistance and strength of the bottle 10 to vertical compressive loads. As a result, the buckling strength of the bottle 10 is improved, preventing deformation of the bottle 10.

[0117] Furthermore, in the bottle 10 according to Supplementary Note 2, the pair of the first upper portion 21a and the first lower portion 22a and the pair of the second upper portion 21b and the second lower portion 22b have different rib formation positions in the axial direction. Therefore, the load is applied to different parts around the two pairs, allowing the load to be distributed. Furthermore, in the bottle 10 according to Supplementary Note 3, the pair of the third upper portion 21c and the third lower portion 22c has different rib formation positions than the pair of the first upper portion 21a and the first lower portion 22a and the pair of the second upper portion 21b and the second lower portion 22b. Therefore, the load is applied to different parts around the three pairs, allowing the load to be distributed.

[0118] Furthermore, in the bottles 10 according to Supplementary Notes 4 and 6, by positioning the apex of the convex shape at the corner 15b, the load applied to the corner 15b can be dispersed to the outer peripheral surface 15a on both sides of the corner 15b. This more reliably improves the resistance and strength of the bottle 10 to vertical compressive loads. Furthermore, in the bottle 10 according to Supplementary Note 5, the pair of the fourth upper portion 21d and the fourth lower portion 22d has rib formation positions different from those of the pair of the first upper portion 21a and the first lower portion 22a and the pair of the second upper portion 21b and the second lower portion 22b. Therefore, the load is applied to different areas around the three pairs, allowing the load to be dispersed. Furthermore, in the bottle 10 according to Supplementary Note 7, the load can be more evenly distributed.

[0119] Furthermore, the peripheral rib 30 of the bottle 210 according to Supplementary Note 8 allows for distributed application of loads. Therefore, the bottle 210 and the peripheral rib 30 can be designed to prevent the load from concentrating on a specific location. This improves the resistance and strength of the bottle 210 to vertical compressive loads. As a result, the buckling strength of the bottle 210 is improved, preventing deformation of the bottle 210. Furthermore, the peripheral rib 30 prevents deformation during gripping, making the bottle 210 easier to grip. Furthermore, when attaching a roll label, an application area can be secured on the body 15.

[0120] Furthermore, the protrusion 40 of the bottle 310 according to Supplementary Note 9 allows for distributed application of loads. Therefore, the bottle 310 and the protrusion 40 can be designed to prevent the load from concentrating on a specific location. This improves the resistance and strength of the bottle 310 to vertical compressive loads. As a result, the buckling strength of the bottle 310 is improved, preventing deformation of the bottle 310. [Explanation of symbols]

[0121] 10: Bottle (plastic container) 12: Mouth 15: Torso 15a: Outer surface 15b: Corner 15c: Body outline 15s: Recess area 16: Bottom 21: Upper rib 21a: 1st upper part 21b: 2nd upper part 21c: Third upper part 21d: 4th upper part 22: Lower rib 22a: 1st lower part 22b: 2nd lower part 22c: 3rd lower part 22d: 4th lower part 30: Peripheral rib 30c: Rib contour 40:Protrusion 41: Upper border 210: Bottles (plastic containers) 310: Bottles (plastic containers) AX: Axis line CL: Center line D1: Distance D2 :Distance P1a: First upper vertex P1b: Second upper vertex P2a: 1st lower vertex P2b: 2nd lower vertex

Claims

1. A resin container having a mouth portion located on the upper side, a bottom portion located on the lower side, and a cylindrical body portion located between the mouth portion and the bottom portion, the trunk portion has a pair of ribs including an upper rib and a lower rib extending in a circumferential direction of the trunk portion, the upper rib has a first upper portion and a second upper portion each having an upwardly convex shape; the lower rib has a first lower portion and a second lower portion each having a downwardly convex shape; the first upper portion and the first lower portion are aligned along the axial direction of the body portion, A resin container, wherein the second upper portion and the second lower portion are aligned along the axial direction.

2. A resin container as described in claim 1, wherein the distance from the first upper vertex of the first upper portion to the first lower vertex of the first lower portion is longer than the distance from the second upper vertex of the second upper portion, which is closest to the first upper portion in the circumferential direction, to the second lower vertex of the second lower portion, which is closest to the first lower portion in the circumferential direction.

3. the upper rib has a third upper portion that is continuous with the first upper portion and the second upper portion and has a downwardly convex shape; The resin container according to claim 1 , wherein the lower rib has a third lower portion that is continuous with the first lower portion and the second lower portion and has an upwardly convex shape.

4. The body portion has a rectangular cylindrical shape, The resin container according to claim 3 , wherein the third upper portion and the third lower portion are aligned along the axial direction at at least one corner of the body portion.

5. the upper rib has the first upper portions adjacent to each other in the circumferential direction and fourth upper portions that are continuous with the adjacent first upper portions and have a downwardly convex shape, The resin container of claim 1, wherein the lower rib has first lower portions adjacent to each other in the circumferential direction and a fourth lower portion that is continuous with each of the adjacent first lower portions and has an upwardly convex shape.

6. The body portion has a rectangular cylindrical shape, The resin container according to claim 5 , wherein the fourth upper portion and the fourth lower portion are aligned along the axial direction at at least one corner of the body portion.

7. The resin container according to claim 1, wherein at least two pairs of the ribs are formed on the body portion so as to surround the body portion.

8. a peripheral rib extending in the circumferential direction of the body portion is formed on the body portion so as to go around the body portion, The resin container of claim 1, wherein the rib contour defined by the center line of the outer peripheral rib is similar in shape to the body contour defined by the outer peripheral surface on which the outer peripheral rib is formed, and when viewed from below, the orientation of the rib contour is shifted relative to the orientation of the body contour.

9. the barrel portion has an inwardly recessed region; The resin container according to claim 1 , wherein an upper boundary of the recessed region includes a protrusion having a downwardly convex shape.

Images