Container made of synthetic resin

Abstract

To provide a synthetic resin container which achieves both improvement of side surface rigidity of a trunk part and improvement of buckling strength by an annular recessed rib.SOLUTION: A synthetic resin container 1 comprises a mouth part 2, a barrel part 4 formed into a cylindrical shape, and a bottom part 5. On the barrel part 4, annular recessed ribs protruding radially inward and annularly extending in a circumferential direction are formed. At least one of the annular recessed ribs is an annular recessed rib 10 with a bent shape which comprises a bent shape part 11 bent to protrude toward either one side of the mouth part 2 side or the bottom part 5 side at a local position in the circumferential direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a container made of synthetic resin.

Background Art

[0002] Among conventional synthetic resin containers, there is known a bottle in which an annular groove is formed on the lower side of the body part, recessed radially inward over the entire circumference (see, for example, Patent Document 1: FIGS. 1 and

[0015] ). Further, among other conventional synthetic resin containers, there is known a round bottle in which a circumferential groove that functions as a circumferential rib is formed on the upper side of the body part (see, for example, Patent Document 2: FIGS. 1 and

[0022] ).

[0003] The above-described annular groove or circumferential groove is configured as an annular concave rib extending annularly in the circumferential direction, and is effective in suppressing deformation that may occur in the radial direction of the body part. For example, the annular concave rib can improve the side surface rigidity of the body part by increasing its radial depth. Thereby, high strength can be obtained against the force applied in the radial direction of the body part.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the conventional annular concave rib described above is formed by a linear concave rib that extends linearly along the circumferential direction parallel to the circumferential direction. The linear concave rib can improve the side rigidity by increasing the radial depth. However, if the radial depth is increased too much, the side rigidity of the barrel part may decrease due to the formability and wall thickness. Also, if the radial depth of the linear concave rib is increased too much, the buckling strength will decrease. In this case, buckling will occur at an earlier stage than when the radial depth is set shallow.

[0006] An object of the present invention is to provide a synthetic resin container capable of achieving both an improvement in the side rigidity of the barrel part and an improvement in the buckling strength by means of an annular concave rib.

Means for Solving the Problems

[0007] The synthetic resin container according to the present invention includes a mouth part, a barrel part formed in a cylindrical shape, and a bottom part. An annular concave rib that protrudes radially inward and extends annularly in the circumferential direction is formed in the barrel part. At least one of the annular concave ribs is an annular concave rib with a bent shape part that bends convexly toward either the side of the mouth part or the side of the bottom part at a local position in the circumferential direction.

[0008] The synthetic resin container according to the present invention can be configured such that a panel part is formed in the barrel part.

[0009] In the synthetic resin container according to the present invention, the annular concave rib with the bent shape is preferably disposed at a position adjacent to the panel part.

[0010] In the synthetic resin container according to the present invention, the bent shape part preferably bends convexly toward the side opposite to the panel part.

[0011] In the synthetic resin container according to the present invention, it is preferable that a plurality of the annular concave ribs with the bent shape are formed at intervals in the axial direction on the barrel portion.

[0012] In the synthetic resin container according to the present invention, it is preferable that the annular concave ribs with the bent shape are arranged such that the respective bent portions are in positions overlapping each other in the circumferential direction.

Advantages of the Invention

[0013] According to the present invention, it is possible to provide a synthetic resin container capable of achieving both an improvement in the side surface rigidity of the barrel portion and an improvement in the buckling strength by the annular concave ribs.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0015] Hereinafter, with reference to the drawings, a synthetic resin container according to an embodiment of the present invention will be described in detail.

[0016] In the present disclosure, the upper side means the side where the mouth portion of the synthetic resin container is located, and the lower side means the side where the bottom portion of the synthetic resin container is located. Also, the axis O is the central axis of the synthetic resin container. In the present disclosure, the "axial direction" means the direction in which the axis O extends. Also, in the present disclosure, the "radial direction" means the direction orthogonal to the axis O. Also, in the present disclosure, the "radial inner side" means the side closer to the axis O among both sides in the radial direction, and the "radial outer side" means the side farther from the axis O among both sides in the radial direction.

[0017] FIG. 1 schematically shows a synthetic resin container 1 according to an embodiment of the present invention. Further, FIG. 2 shows an enlarged view of region A in FIG. 1.

[0018] The synthetic resin container 1 includes a mouth portion 2, a cylindrical body portion 4, and a bottom portion 5. In the body portion 4, annular concave ribs (10, 41, 42) are formed that project radially inward and extend annularly in the circumferential direction. At least one of the annular concave ribs (10, 41, 42) is a bent annular concave rib 10 with a bent shape (hereinafter also referred to as "bent concave rib 10") that includes a bent shape portion 11 that bends convexly toward either the side of the mouth portion 2 or the side of the bottom portion 5 at a local position in the circumferential direction.

[0019] Here, the "circumferential direction" refers to the circumferential direction of a circle centered on the axis О drawn on a plane perpendicular to the axis О. In the present disclosure, when the axis О is a vertical line, it refers to the circumferential direction of a circle centered on the axis О drawn on a horizontal plane. However, the above plane may be an inclined plane inclined with respect to the horizontal plane. In this case, the bent concave rib 10 will be inclined with respect to the axis О in the side view of FIG. 1.

[0020] Referring to FIG. 2, the bent concave rib 10 includes a bent shape portion 11 and a linear shape portion 12. The bent shape portion 11 and the linear shape portion 12 each project radially inward and extend in the circumferential direction, and are connected to each other in the circumferential direction. As a result, the bent concave rib 10 projects radially inward and extends annularly in the circumferential direction as a single annular concave rib.

[0021] In the present disclosure, the bent concave rib 10 is formed by a plurality of bent portions 11 and a plurality of linear portions 12. Specifically, the bent concave rib 10 is formed by alternately arranging the bent portions 11 and the linear portions 12 in the circumferential direction. That is, the bent portions 11 are discontinuously arranged in the circumferential direction in the bent concave rib 10. As a result, the bent portions 11 are arranged at local positions in the circumferential direction with an interval corresponding to the linear portions 12. It is preferable that the bent portions 11 and the linear portions 12 are evenly arranged in the circumferential direction. However, the arrangement ratio of the bent portions 11 and the linear portions 12 in the circumferential direction can be set as appropriate. Further, the bent concave rib 10 can be formed by one or more bent portions 11 and one or more linear portions 12.

[0022] The linear portion 12 extends along the circumferential direction parallel to the circumferential direction. For this reason, the linear portion 12 extends linearly along the radial direction (horizontal direction) in a side view as shown in FIG. 2, for example.

[0023] On the other hand, the bent portion 11 has a first inclined portion 13, a second inclined portion 14, and a top portion 15. Referring to FIG. 2, the bent portion 11 is formed by connecting the first inclined portion 13 and the second inclined portion 14 at the top portion 15 in a side view.

[0024] The first inclined portion 13 and the second inclined portion 14 are inclined so as to approach each other as they go toward either the side of the mouth portion 2 or the side of the bottom portion 5 in a side view as shown in FIG. 2. For example, in the present disclosure, when the circumferential direction is defined as shown by the arrow in FIG. 2, the first inclined portion 13 is inclined toward the side of the mouth portion 2 so as to move away from the linear-shaped portion 12 as it goes from one side to the other side in the circumferential direction. On the other hand, the second inclined portion 14 is inclined toward the side of the mouth portion 2 so as to move away from the linear-shaped portion 12 as it goes from the other side to the one side in the circumferential direction. In other words, when the synthetic resin container 1 is viewed in the axial direction from the side of the mouth portion 2, the first inclined portion 13 is inclined toward the side of the mouth portion 2 so as to move away from the linear-shaped portion 12 as it extends counterclockwise around the axis О when the bent concave rib 10 is defined to extend counterclockwise in the circumferential direction. On the other hand, when the synthetic resin container 1 is viewed in the axial direction from the side of the mouth portion 2, the second inclined portion 14 is inclined toward the side of the mouth portion 2 so as to move away from the linear-shaped portion 12 as it extends clockwise around the axis О when the bent concave rib 10 is defined to extend clockwise in the circumferential direction. That is, in the present disclosure, as shown in FIG. 2 in a side view, the bent-shaped portion 11 protrudes convexly (in a mountain shape or an inverted V shape) toward the side of the mouth portion 2 with respect to the linear-shaped portion 12.

[0025] Here, an annular concave rib according to a conventional synthetic resin container is formed by a linear concave rib that linearly extends along the circumferential direction parallel to the circumferential direction. However, when a stress of a certain level or more is applied from the side surface of the body portion to such an existing linear concave rib, the groove width of the linear concave rib located in the pressing direction becomes narrow, and the body portion may be deformed into an elliptical shape (flat shape) by being deformed so that the groove width of the linear concave rib in the portion orthogonal to the pressing direction widens.

[0026] In contrast, in the synthetic resin container 1, at least one of the annular concave ribs is a bent concave rib 10, and a part of the bent concave rib 10 is formed by a bent-shaped portion 11 protruding in a mountain shape along the axial direction. In this case, the bent-shaped portion 11 is difficult to deform even when, for example, the outer surface of the body portion 4 is pushed radially inward. Further, the bent-shaped portion 11 suppresses the deformation into the above-described elliptical shape. That is, according to the synthetic resin container 1, since a part of the bent concave rib 10 is formed by the bent-shaped portion 11, it is possible to suppress the deformation that may occur in the radial direction of the body portion. Therefore, according to the synthetic resin container 1, the side surface rigidity of the body portion 4 is improved.

[0027] Further, in the case of the existing straight concave rib, when the radial depth is increased, the buckling strength is reduced. For example, in the case of a straight concave rib, when the synthetic resin container is compressed in the axial direction by a force applied from at least one of the mouth portion 2 and the bottom portion 5, the straight concave rib bends and buckles at an earlier stage than when the radial depth is set shallow.

[0028] In contrast, in the synthetic resin container 1, a part of the bent concave rib 10 is formed by a bent-shaped portion 11 protruding in a mountain shape along the axial direction. In this case, even when the synthetic resin container is compressed with a greater force in the axial direction than when the radial depth of the existing straight concave rib is increased to the limit, the bent concave rib 10 does not bend and buckle. That is, according to the synthetic resin container 1, since a part of the bent concave rib 10 is formed by the bent-shaped portion 11, it is possible to suppress the buckling deformation that may occur in the axial direction of the body portion. Therefore, according to the synthetic resin container 1, the buckling strength is also improved.

[0029] Therefore, according to the synthetic resin container 1, the bent concave rib 10 makes it possible to achieve both an improvement in the side surface rigidity of the body portion 4 and an improvement in the buckling strength.

[0030] Incidentally, referring to FIG. 1, in the present disclosure, the synthetic resin container 1 includes a cylindrical mouth portion 2, a shoulder portion 3 connected to the lower end of the mouth portion 2, a body portion 4 connected to the lower end of the shoulder portion 3, and a bottom portion 5 connected to the lower end of the body portion 4. The bottom portion 5 closes the lower end of the body portion 4.

[0031] In the present disclosure, the synthetic resin container 1 is a round bottle formed in a cylindrical shape. The interior of the synthetic resin container 1 is an accommodation space capable of accommodating various contents.

[0032] In the present disclosure, the synthetic resin container 1 is a blow-molded container. In the present disclosure, the synthetic resin container 1 is mainly made of polyethylene terephthalate (PET) and is formed by a biaxial stretch blow molding method. However, the main raw material is not limited to polyethylene terephthalate. The main raw material can be, for example, heat-resistant polypropylene (PP). Also, the synthetic resin container 1 can be formed by extrusion blow molding (direct blow molding). That is, as long as the synthetic resin container 1 is mainly made of synthetic resin, its molding method is not limited.

[0033] In the present disclosure, the shoulder portion 3 has a dome shape that expands downward. In the present disclosure, a plurality of vertical concave ribs 3a are formed at intervals in the circumferential direction on the shoulder portion 3. The vertical concave ribs 3a project radially inward and extend linearly in the axial direction. However, the shoulder portion 3 does not necessarily have to be in a dome shape, and various shapes such as a polyhedron shape can be appropriately adopted. Also, the vertical concave ribs 3a can be omitted.

[0034] Also, in the present disclosure, the body portion 4 has an upper body portion main body 4a and a lower body portion main body 4d formed in a cylindrical shape. The upper body portion main body 4a and the lower body portion main body 4d form the cylindrical shape of the body portion 4, that is, the basic external shape of the body portion 4.

[0035] In the present disclosure, the body portion 4 has an upper body portion main body 4a, a lower body portion main body 4d, and a recessed portion 4b disposed between the upper body portion main body 4a and the lower body portion main body 4d. A first linear concave rib 41 is formed on the upper portion of the upper body portion main body 4a. The first linear concave rib 41 projects the body portion main body 4a radially inward and linearly extends annularly along the circumferential direction parallel to the circumferential direction. That is, in the present disclosure, the first linear concave rib 41 is an existing linear concave rib, that is, a conventional annular concave rib. In the present disclosure, a plurality of first linear concave ribs 41 are formed at intervals in the axial direction. In the present disclosure, the body portion 4 includes two first linear concave ribs 41. In this case, the gap between the two first linear concave ribs 41 forms a first annular gap rib 4r1. In the present disclosure, the outer diameter of the first annular gap rib 4r1 is equal to, for example, the outer diameter of the body portion main body 4a. However, the first linear concave rib 41 can be at least one. Alternatively, the first linear concave rib 41 can also be omitted.

[0036] Next, in the present disclosure, the body portion 4 includes a bent concave rib 10. In the present disclosure, the bent concave rib 10 is disposed below the first linear concave rib 41 and is located in the lower portion of the upper body portion main body 4a.

[0037] Also, in the present disclosure, a plurality of bent concave ribs 10 are disposed at intervals in the axial direction on the body portion 4. In the present disclosure, the bent concave rib 10 is formed by projecting the body portion main body 4a radially inward and extending annularly in the circumferential direction. In this case, the side surface rigidity and buckling strength of the body portion 4 are further improved. In the present disclosure, the body portion 4 includes two bent concave ribs 10. However, the bent concave rib 10 can be three or more, or only one. That is, the bent concave rib 10 can be at least one.

[0038] In addition, in the present disclosure, the gap between the two bent concave ribs 10 forms a second annular gap rib 4r2. A part of the second annular gap rib 4r2 is formed in a bent shape along the bent shape portion 11. That is, the second annular gap rib 4r2 is formed in a bent shape in which a part thereof is bent convexly. In this case, for example, when a force is applied radially to the second annular gap rib 4r2, the second annular gap rib 4r2 is less likely to be flattened than when a force is applied to the first annular gap rib 4r1. That is, since a part of the second annular gap rib 4r2 is formed in a bent shape, the deformation that may occur in the radial direction of the body is further suppressed. Therefore, if a plurality of bent concave ribs 10 are arranged in the axial direction, the side surface rigidity of the body 4 can be further improved. Also, in this case, since a part of the second annular gap rib 4r2 is formed in a bent shape, the buckling deformation that may occur in the axial direction of the body can also be further suppressed. Therefore, if a plurality of bent concave ribs 10 are arranged in the axial direction, the buckling strength can also be further improved.

[0039] Also, referring to FIG. 2, in the present disclosure, the plurality of bent concave ribs 10 are arranged such that the bent shape portions 11 overlap each other in the circumferential direction. Specifically, as shown in FIG. 2, the two bent concave ribs 10 are arranged at intervals in the axial direction and are arranged at positions overlapping each other in the circumferential direction. In this case, the side surface rigidity and the buckling strength of the body 4 can be further improved.

[0040] Also, referring to FIG. 1, in the present disclosure, in the body 4, a recessed portion 4b having an outer diameter smaller than that of the upper body main body 4a and the lower body main body 4d is formed between the upper body main body 4a and the lower body main body 4d. A panel portion 6 is formed in the recessed portion 4b. The panel portion 6 is a so-called decompression absorption panel. The decompression absorption panel deforms preferentially more than other portions of the synthetic resin container 1 when the internal pressure of the synthetic resin container 1 decreases, and absorbs the decrease in the internal pressure of the synthetic resin container 1.

[0041] In addition, in the present disclosure, the recessed portion 4b is formed by protruding the body main body 4a radially inward and extending in a cylindrical shape in the circumferential direction. In the present disclosure, a plurality of panel portions 6 are formed on the body portion 4. The panel portions 6 are arranged at intervals in the circumferential direction. In the present disclosure, the panel portions 6 are inclined obliquely around the axis О. However, the shape of the panel portion 6 can be set as appropriate. For example, the panel portion 6 can also extend parallel to the axial direction. Further, in the present disclosure, between the panel portions 6 adjacent to each other in the circumferential direction, a columnar reinforcing portion 4c formed in a column shape is formed to reinforce the body portion 4.

[0042] In the present disclosure, the bent concave rib 10 is disposed at a position adjacent to the panel portion 6. In the present disclosure, the panel portion 6 is disposed below the bent concave rib 10. In this case, it is possible to make it difficult to flatten the body portion 4 (body main body 4a) between the bent concave rib 10 and the panel portion 6. Also, in this case, the buckling strength can also be further improved.

[0043] In the present disclosure, the gap between the bent concave rib 10 and the recessed portion 4b forms a third annular gap rib 4r3. Also, a part of the upper contour line of the third annular gap rib 4r3 is bent convexly along the bent shape portion 11.

[0044] Further, in the present disclosure, as shown in FIG. 1, the bent shape portion 11 is bent convexly toward the side opposite to the side of the panel portion 6. Specifically, the bent shape portion 11 is bent convexly toward the side of the mouth portion 2 on the side opposite to the side of the panel portion 6. Note that the bent shape portion 11 is bent convexly toward the bottom portion 5 when the bent concave rib 10 is disposed below the panel portion 6.

[0045] When the axial gap between the bent concave rib 10 and the panel portion 6 in the trunk portion 4 becomes narrow, the formability of the gap during molding decreases. For this reason, it is preferable to arrange the bent concave rib 10 so that the bent portion 11 does not face the panel portion 6 side. In the present disclosure, the bent portion 11 is bent convexly toward the side of the mouth portion 2 opposite to the panel portion 6 side. In this case, since the gap (third annular gap rib 4r3) between the bent concave rib 10 and the panel portion 6 can be widened, the shape of the gap portion can be easily formed during molding.

[0046] Also, in the present disclosure, as shown in FIG. 1, the bent portion 11 is arranged at a position overlapping in the circumferential direction with respect to the panel portions 6 arranged at intervals in the axial direction. Further, the top portion 15 of the bent portion 11 overlaps in the circumferential direction with the circumferential center at the upper end of the panel portion 6. In this case, as in the present disclosure, if the bent portion 11 is bent convexly toward the side opposite to the panel portion 6 side, it is effective for easily forming the shape of the gap portion during molding. However, when the bent portion 11 is arranged at a position overlapping in the circumferential direction with respect to the columnar reinforcing portion 4c adjacent to the panel portions 6 arranged at intervals in the axial direction, the bent portion 11 may be bent convexly toward the side opposite to the panel portion 6 side, or the bent portion 11 may be bent convexly toward the panel portion 6 side. Also, even when the formability between the bent concave rib 10 and the panel portion 6 can be ensured, the bent portion 11 may be bent convexly toward the panel portion 6 side.

[0047] Also, in the present disclosure, a second linear concave rib 42 is formed in the lower portion of the body 4 (lower body main body 4d). The second linear concave rib 42 is the same as the first linear concave rib 41, and is an existing linear concave rib, that is, a conventional annular concave rib. In the present disclosure, a plurality of second linear concave ribs 42 are formed at intervals in the axial direction. In the present disclosure, the body 4 is provided with two second linear concave ribs 42. In this case, the gap between the two second linear concave ribs 42 forms a fifth annular gap rib 4r5. However, the second linear concave rib 42 can be at least one. Alternatively, the second linear concave rib 42 can also be omitted.

[0048] Also, in the present disclosure, the second linear concave rib 42 is disposed below the panel portion 6. Also, in the present disclosure, as described above, a recessed portion 4b in which the body main body 4a is recessed radially inward is formed in the body 4. In the present disclosure, the gap between the recessed portion 4b and the second linear concave rib 42 forms a fourth annular gap rib 4r4.

[0049] Also, in the present disclosure, the bottom portion 5 has a ground contact surface 5a and a heel 5b. The upper end of the heel 5b is continuous with the body 4. Also, the lower end of the heel 5b is continuous with the ground contact surface 5a.

[0050] In the present disclosure, the gap between the second linear concave rib 42 and the bottom portion 5 forms a sixth annular gap rib 4r6. Also, in the present disclosure, the gap between the lower end of the shoulder portion 3 and the first linear concave rib 41 forms a seventh annular gap rib 4r7.

[0051] The above description has explained exemplary embodiments of the present invention, and various changes can be made without departing from the scope of the claims.

[0052] For example, the first linear concave rib 41 can be replaced with the bent concave rib 10. That is, the annular concave rib above the panel portion 6 can be only the bent concave rib 10. The second linear concave rib 42 can also be replaced with the bent concave rib 10. That is, the bent concave rib 10 can be disposed below the panel portion 6. Further, when at least one of the first linear concave rib 41 and the second linear concave rib 42 is replaced with the bent concave rib 10, the bent concave rib 10 related to the synthetic resin container 1 can be replaced with existing linear concave ribs such as the first linear concave rib 41 and the second linear concave rib 42. That is, the layout when the bent concave rib 10 and the existing linear concave ribs are disposed on the body portion 4 can be set as appropriate. Also, the layout (for example, the axial arrangement) when the panel portion 6 is disposed on the body portion 4 can also be set as appropriate. On the other hand, the panel portion 6 can also be omitted. That is, it is sufficient that at least one bent concave rib 10 is formed on the body portion 4. In this case, the existing linear concave ribs can be omitted.

[0053] As described above, various configurations employed in the above-described embodiments can be realized by appropriately performing replacement, omission, or combination.

Explanation of Reference Numerals

[0054] 1: Synthetic resin container, 2: Mouth portion, 3: Shoulder portion, 3a: Vertical concave rib, 4: Body portion, 4a: Upper body portion main body, 4b: Depression portion, 4c: Columnar reinforcing portion, 4d: Lower body portion main body, 5: Bottom portion, 5a: Ground contact surface, 5b: Heel, 6: Panel portion, 10: Bent concave rib (annular concave rib with a bent shape), 11: Bent shape portion, 12: Linear shape portion, 13: First inclined portion, 14: Second inclined portion, 15: Top portion, 41: First circumferentially extending concave rib, 42: Second circumferentially extending concave rib, 4r1: First annular gap rib, 4r2: Second annular gap rib, 4r3: Third annular gap rib, 4r4: Fourth annular gap rib, 4r5: Fifth annular gap rib, 4r6: Sixth annular gap rib, 4r7: Seventh annular gap rib

Claims

1. A synthetic resin container comprising a mouth portion, a cylindrical body portion, and a bottom portion, wherein an annular concave rib is formed on the body portion, projecting radially inward and extending annularly in the circumferential direction. At least one of the annular concave ribs has a bent shape portion that bends convexly toward either the side of the mouth portion or the side of the bottom portion at a local position in the circumferential direction, and is an annular concave rib with a bent shape. A panel portion is further formed on the body portion. The bent shape portion bends convexly toward the side opposite to the side of the panel portion, and is a synthetic resin container.

2. The synthetic resin container according to Claim 1, wherein the annular concave rib with a bent shape is disposed at a position adjacent to the panel portion.

3. The synthetic resin container according to Claim 1 or 2, wherein a plurality of the annular concave ribs with a bent shape are formed at intervals in the axial direction on the body portion.

4. The synthetic resin container according to Claim 3, wherein the annular concave ribs with a bent shape are arranged such that the respective bent shape portions overlap each other in the circumferential direction.

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