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. An outer peripheral rib extending in a circumferential direction of the trunk part is formed, in the trunk part, to go round the trunk part. A contour of a rib specified by a center line of the outer peripheral rib is similar in shape to a contour of the trunk part specified by an outer peripheral surface on which the outer peripheral rib is formed, where a direction of the contour of the rib is shifted with respect to a direction of the contour of the trunk part, when viewed from below.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, a peripheral rib extending in a circumferential direction of the body portion is formed on the body portion so as to go around the body portion, The rib contour defined by the center line of the peripheral rib is similar in shape to the body contour defined by the outer peripheral surface on which the 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. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 2 is a side view of the resin container according to the first embodiment. [Figure 2] FIG. 1 is a front view of a resin container according to a first embodiment. [Figure 3] A is the IIIA-IIIA cross section of Figure 2, B is the IIIB-IIIB cross section of Figure 2, and C is the IIIC-IIIC cross section of Figure 2. [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] 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 Figs. 1 to 3. Fig. 1 is a side view of a bottle 10 in an upright position. That is, Fig. 1 shows the bottle 10 with the bottom 16 positioned downward and the mouth 12 positioned upward. Fig. 2 is a front view of the bottle 10. Fig. 3 is a cross-sectional view of the bottle 10. Fig. 3A shows the IIIA-IIIA cross section in Fig. 2. Fig. 3B shows the IIIB-IIIB cross section in Fig. 2. Fig. 3C shows the IIIC-IIIC cross section in Fig. 2.

[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] [Peripheral rib 30] As shown in Figure 1, the body 15 is formed with peripheral ribs 30 that extend circumferentially around the body 15 to reinforce the bottle 10. As an example, seven 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.

[0020] The multiple peripheral ribs 30 are formed at equal intervals in the axial direction. That is, the distance between the center lines CL of the peripheral ribs 30 is the same. However, the distance between the peripheral ribs 30 may be different at at least one point. 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.

[0021] Each circumferential rib 30 is a groove that protrudes inward from the bottle 10 and extends circumferentially. That is, each rib 30 bulges inward from the outer circumferential surface 15a that defines the contour of the body 15. Alternatively, each circumferential rib 30 may be a convex or ridge that protrudes outward from the bottle 10 and extends circumferentially. This shape can also reinforce the body 15. Furthermore, compared to groove-shaped ribs 30 that protrude inward, this shape can prevent the volume of the bottle 10 from decreasing. However, if the circumferential ribs 30 are grooves, the outward-protruding ribs 30 can be prevented from contacting each other when multiple bottles 10 are stored or transported.

[0022] As shown in FIG. 3 , the rib contour 30c defined by the center line CL of the circumferential rib 30 is similar in shape to the body contour 15c defined by the outer peripheral surface 15a on which the circumferential rib 30 is formed. Additionally, when viewed from below the bottle 10, 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 10 passing through the center line CL of the circumferential rib 30, the orientation of the rib contour 30c in the cross-section is tilted. Here, the body contour 15c is the surface on the outer side of the edge of the circumferential rib 30 and coincides with the contour of a surface flush with the outer peripheral surface 15a. Note that in FIG. 3 , the bottom side of the drawing corresponds to the front. The center line CL is a line tracing the bottom of the groove-shaped circumferential rib 30. Here, the center line CL is defined as the line connecting the centers of the circumferentially extending edges of the circumferential rib 30. That is, the center line CL is located equidistant from both edges of the circumferential rib 30.

[0023] In Figure 3, the rib contour 30c is located inside the body contour 15c, i.e., at a position offset inward of the bottle 10 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 3, 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 outward from the bottle 10. In this case, the rib contour 30c is located outside the body contour 15c, i.e., at a position offset outward of the bottle 10 relative to the outer circumferential surface 15a.

[0024] 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 3A and 3C, the rib contour 30c is inclined clockwise by θ1 around the axis AX. In the example of Figure 3B, 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.

[0025] 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.

[0026] 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.

[0027] 3A, in the clockwise direction, the rib contour 30c gradually moves away from the body contour 15c, starting from the minimum portion 32. Conversely, in the counterclockwise direction, the rib contour 30c gradually moves closer to the body contour 15c, starting from the maximum portion 31. Also, in the example shown in FIG. 3B, in the clockwise direction, the rib contour 30c gradually moves closer to the body contour 15c, starting from the maximum portion 31. Conversely, in the counterclockwise direction, the rib contour 30c gradually moves away from the body contour 15c, 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.

[0028] 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.

[0029] 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.

[0030] For example, the top rib profile 30c shown in FIG. 3A is tilted clockwise by θ1. The second rib profile 30c shown in FIG. 3B is tilted counterclockwise by θ2. In this manner, the orientation of one rib profile 30c of two adjacent peripheral ribs 30 is offset from the orientation of the other rib profile 30c of the adjacent peripheral rib 30. The second rib profile 30c shown in FIG. 3B is tilted counterclockwise by θ2. The third rib profile 30c shown in FIG. 3C is tilted clockwise by θ1. Alternatively, all of the rib profiles 30c may be oriented in the same direction.

[0031] 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.

[0032] 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. 3A and 3C, 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. 3A is the same as the orientation of the rib contour 30c shown in FIG. 3C. Here, the rib contour 30c shown in FIG. 3A corresponds to the upper circumferential rib 30 relative to the circumferential rib 30 shown in FIG. 3B. The rib contour 30c shown in FIG. 3C corresponds to the lower circumferential rib 30 relative to the circumferential rib 30 shown in FIG. 3B.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] For example, Figure 2 shows outer peripheral ribs 30a and 30b that are adjacent to each other in the axial direction. Here, the maximum portion 31a of outer peripheral rib 30a and the maximum portion 31b of 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 outer peripheral rib 30a and the minimum portion 32b of outer peripheral rib 30b are located at different positions in the circumferential direction and are not aligned in the axial direction.

[0038] The peripheral rib 30 described above distributes the load across the entire bottle 10, allowing the load to be borne by the entire bottle 10. This improves the buckling strength of the bottle 10, preventing deformation of the bottle 10. Furthermore, the peripheral rib 30 suppresses deformation when gripped, making the bottle 10 easier to grip.

[0039] 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.

[0040] For example, if horizontal ribs with uniform protrusion lengths were formed horizontally in the circumferential direction, deformation could occur starting from the horizontal ribs when a load is applied from the top of the resin bottle. On the other hand, the peripheral rib 30 has a shape that improves buckling strength, prevents deformation, and makes the bottle easier to grip while maintaining a sufficient application area. Specifically, the orientation of the rib contour 30c is offset from the orientation of the body contour 15c. This reduces deformation of the bottle 10 starting from the peripheral rib 30 compared to horizontal ribs with uniform protrusion lengths.

[0041] 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 be prevented from boiling over. Furthermore, the rigidity of the bottle 10 is improved in the area where the outer circumferential rib 30 is formed. This makes the bottle 10 less likely to be crushed when gripped, making it easier to hold. Furthermore, by preventing deformation when gripped, the occurrence of the contents boiling over can be reduced.

[0042] [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.

[0043] 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 130 formed therein. The multiple horizontal ribs 130 run circumferentially around the body 115 and are parallel to one another. The width and protrusion amount of the horizontal ribs 130 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.

[0044] As shown in FIG. 4, in the bottle 10, the positions of the additional portions LD1 to LD7, 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 peripheral rib 30 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, 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.

[0045] 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 suppresses deformation in the body portion 15. That is, the bottle 10 equipped with the peripheral rib 30 can withstand relatively strong loads. In particular, the peripheral rib 30 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 peripheral rib 30 inward due to concentrated loads. This significantly improves the strength and resistance of the bottle 10 to buckling deformation caused by vertical compressive loads.

[0046] [Comparative Example] On the other hand, as shown in Figure 6, in the bottle 100 according to the comparative example, additional portions LD8 to LD14, which are subject to large strains when a load is applied, are aligned on a virtual 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 130 buckles even when a relatively small load is applied.

[0047] [Label attachment] The attachment of a label will be described with reference to 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.

[0048] The body 15 has an area 15s where a label is attached. In this area 15s, the application area is a continuous, smooth surface without any irregularities due to the peripheral ribs 30. In particular, the relatively large area between two axially adjacent peripheral ribs 30 can be used as the application area. This ensures a smooth surface with a certain extent, allowing the roll label to be adhered to a wide application area. Furthermore, the multiple application areas are set to be aligned linearly in the axial direction. Alternatively, the multiple application areas may be set at different positions in the circumferential direction.

[0049] 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.

[0050] 2, 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, region 15s may be provided only in a portion of body portion 15 in the axial direction. For example, region 15s may be provided in an area excluding the upper region of body portion 15, the central region of body portion 15, or the lower region of body portion 15. As another example, a shrink label made of a shrink film that is attached using heat shrinkage may be attached to body portion 15.

[0051] As described above, the bottle 10 according to the first embodiment allows for distributed application of loads. Therefore, the bottle 10 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 10 to vertical compressive loads. As a result, the buckling strength of the bottle 10 is improved, preventing deformation of the bottle 10. Furthermore, the peripheral rib 30 reduces deformation during gripping, making the bottle 10 easier to grip. Furthermore, when attaching a roll label, an application area can be secured on the body 15.

[0052] 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 10 and peripheral rib 30 to be designed to prevent the load from concentrating on a specific location.

[0053] [Second embodiment] Next, a second embodiment will be described with reference to Fig. 7 to Fig. 12. A bottle 210 according to the second embodiment differs from the first embodiment in that it is provided with a pair of ribs 20 including an upper rib 21 and a lower rib 22. Fig. 7 is a perspective view of the bottle 210 as seen from above, and Fig. 8 is a front view of the bottle 210. Fig. 9 is a right side view of the bottle 210, and Fig. 10 is a left side view of the bottle 210. Fig. 11 is a rear view of the bottle 210, Fig. 12A is a plan view of the bottle 210, and Fig. 12B is a bottom view of the bottle 210.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] [Peripheral rib 30] The body 15 is formed with a peripheral rib 30 that extends circumferentially around the body 15 to reinforce the bottle 210. As described above with reference to Figure 3, the rib contour 30c defined by the center line CL 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 shifted relative to the orientation of the body contour 15c.

[0062] 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.

[0063] 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.

[0064] [Third embodiment] Next, a third embodiment will be described with reference to Fig. 13. A bottle 310 according to the third embodiment differs from the first and second embodiments in that it includes a protrusion 40. Fig. 13 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. 13.

[0065] The body 15 has an inwardly recessed region 15s, which serves as a label attachment region. The upper boundary of this region 15s is defined by a step formed by an upper boundary 41. The lower boundary of the region 15s is defined by a step formed by a lower boundary (not shown). The upper boundary 41 includes a protrusion 40 having a downwardly convex shape. The label is attached to cover the protrusion 40. In the example shown in FIG. 13, 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 eliminates corners 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 linearly extending portion.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] A part or all of the above-described embodiments can be described as, but not limited to, the following supplementary notes.

[0073] (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, a peripheral rib extending in a circumferential direction of the body portion is formed on the body portion so as to go around the body portion, A resin container in which 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.

[0074] (Appendix 2) the body portion has the outer peripheral ribs adjacent to each other in the axial direction of the body portion, A resin container as described in Appendix 1, wherein the orientation of the rib contour of one of the adjacent peripheral ribs is offset from the orientation of the rib contour of the other of the adjacent peripheral ribs.

[0075] (Appendix 3) A resin container as described in Appendix 1 or 2, wherein the protruding length of the outer peripheral rib along the center line varies continuously from a maximum portion having a maximum protruding length to a minimum portion having a minimum protruding length.

[0076] (Appendix 4) 4. A resin container as described in Appendix 3, wherein the outer peripheral rib has a shape such that the pattern of change in the protrusion length from the maximum portion to the minimum portion is repeated.

[0077] (Appendix 5) the body portion has the outer peripheral ribs adjacent to each other in the axial direction of the body portion, 5. A resin container as described in Appendix 4, wherein the maximum portion of one of the adjacent peripheral ribs is located at a different circumferential position from the maximum portion of the other of the adjacent peripheral ribs.

[0078] (Appendix 6) The body portion has at least three of the outer peripheral ribs arranged in an axial direction of the body portion, A resin container described in any one of Appendices 1 to 5, wherein the upper and lower peripheral ribs sandwiching one of the at least three peripheral ribs have the same rib contour direction.

[0079] According to the bottle 10 of Supplementary Note 1, the portions to which the load is applied can be distributed. Therefore, the bottle 10 and the peripheral rib 30 can be designed to prevent the load from concentrating on a specific location. Furthermore, the peripheral rib 30 prevents deformation when gripped, making the bottle 10 easier to grip. Furthermore, according to the bottle 10 of Supplementary Note 2, the positions of the portions to which the load is applied can be shifted in the circumferential direction, thereby dispersing the load. Furthermore, according to the bottle 10 of Supplementary Note 3, since no steps are formed in the peripheral rib 30, the occurrence of portions to which the load is concentrated on the peripheral rib 30 can be prevented.

[0080] Furthermore, with the bottle 10 according to Supplementary Note 4, the position of the portion to which the load is applied can be shifted circumferentially over the entire outer periphery of the bottle 10, thereby distributing the load. With the bottle 10 according to Supplementary Note 5, the position of the portion to which the load is applied can be shifted circumferentially, thereby distributing the load. With the bottle 10 according to Supplementary Note 6, the position to which the load is applied can be distributed so that the load is not concentrated in a specific portion. [Explanation of symbols]

[0081] 10: Bottle (plastic container) 12: Mouth 15: Torso 15a: Outer surface 15b: Corner 15c: Body outline 16: Bottom 30: Peripheral rib 30c: Rib contour 31 :Maximum part 32 :Minimum part 210: Bottles (plastic containers) 310: Bottles (plastic containers) CL: Center line

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, a peripheral rib extending in a circumferential direction of the body portion is formed on the body portion so as to go around the body portion, A resin container in which 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.

2. the body portion has the outer peripheral ribs adjacent to each other in the axial direction of the body portion, The resin container according to claim 1 , wherein the orientation of the rib contour of one of the adjacent peripheral ribs is shifted from the orientation of the rib contour of the other of the adjacent peripheral ribs.

3. 2. The resin container according to claim 1, wherein the protruding length of the outer peripheral rib varies continuously along the center line from a maximum portion having a maximum protruding length to a minimum portion having a minimum protruding length.

4. The resin container according to claim 3 , wherein the outer peripheral rib has a shape such that a pattern of change in the protruding length from the maximum portion to the minimum portion is repeated.

5. the body portion has the outer peripheral ribs adjacent to each other in the axial direction of the body portion, The resin container according to claim 4 , wherein the maximum portion of one of the adjacent outer peripheral ribs is located at a different position in the circumferential direction from the maximum portion of the other of the adjacent outer peripheral ribs.

6. The body portion has at least three of the outer peripheral ribs arranged in an axial direction of the body portion, A resin container according to any one of claims 1 to 5, wherein the orientation of the rib contours of the upper and lower peripheral ribs sandwiching one of the at least three peripheral ribs is the same.

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