Extrusion blow molded containers

Abstract

To provide an extrusion blow-molded container in which deformation of the whole container suppressed.SOLUTION: An extrusion blow-molded container 1A comprises a lower side barrel part 8 having a decompression absorbing panel 8a, and an upper side barrel part 4. Between the lower side barrel part 8 and the upper side barrel part 4, the container 1A comprises a convex rib 6 and a lower concave rib 7 disposed below the convex rib 6. The lower concave rib 7 includes: a bottom surface portion 71 which extends in the axial direction in a side view and is formed flat; an upper-side inclined portion 72 which is formed continuously with a lower end of the convex rib 6, is linearly inclined toward an upper end 7e1 of the bottom surface portion 71 in a side view, and is connected to the upper end 7e1 of the bottom surface portion 71; and a lower-side inclined portion 73 which is connected to an upper end 8e1 of the lower side barrel part 8, is linearly inclined toward a lower end 7e2 of the bottom surface portion 71 in a side view, and is connected to the lower end 7e2 of the bottom surface portion 71.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to extrusion blow molded containers. [Background technology]

[0002] Known conventional extrusion blow-molded containers include a lower body portion in which a vacuum absorption panel is formed and an upper body portion located above the lower body portion (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-143125 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the above-mentioned conventional extrusion blow-molded containers are made lighter (thinner-walled) for the purpose of reducing the environmental load, there is a problem in that the entire container is deformed, for example, into an elliptical shape in the circumferential direction around the central axis of the container before the vacuum absorption panel can function.

[0005] An object of the present invention is to provide an extrusion blow-molded container in which deformation of the entire container is suppressed. [Means for solving the problem]

[0006] The extrusion blow-molded container according to the present invention is an extrusion blow-molded container comprising a lower body portion having a vacuum absorption panel formed therein, and an upper body portion located above the lower body portion, wherein the extrusion blow-molded container further comprises, between the lower body portion and the upper body portion, a convex rib that protrudes radially outward and extends circumferentially, and a lower concave rib that is located below the convex rib, protrudes radially inward, and extends circumferentially, and the lower concave rib has a bottom portion that extends along the axial direction and is formed flat in a side view, an upper inclined portion that is formed continuous with the lower end of the convex rib and is linearly inclined toward the upper end of the bottom portion in a side view and is connected to the upper end of the bottom portion, and a lower inclined portion that is connected to the upper end of the lower body portion and is linearly inclined toward the lower end of the bottom portion in a side view and is connected to the lower end of the bottom portion.

[0007] The extrusion blow-molded container according to the present invention further comprises an upper concave rib that is positioned above the convex rib, protrudes radially inward, and extends circumferentially, and it is preferable that the upper concave rib is formed with: a bottom portion that extends along the axial direction in a side view and is formed flat; an upper inclined portion that is connected to the lower end of the upper body portion and that slopes linearly toward the upper end of the bottom portion in a side view and is connected to the upper end of the bottom portion; and a lower inclined portion that is formed continuously with the upper end of the convex rib and that slopes linearly toward the lower end of the bottom portion in a side view and is connected to the lower end of the bottom portion.

[0008] In the extrusion blow molded container according to the present invention, it is preferable that the upper body portion is formed with a curved concave rib that protrudes radially inward, extends circumferentially, and has an arc-shaped shape in side view.

[0009] In the extrusion blow molded container according to the present invention, it is preferable that at least one pair of the vacuum absorption panels is formed in a direction perpendicular to the extending direction of the pinch-off portion. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an extrusion blow-molded container in which deformation of the entire container is suppressed. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view schematically showing an extrusion blow molded container according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view showing an area A in FIG. [Figure 3] 2 is a bottom view schematically showing the bottom surface of the extrusion blow molded container of FIG. 1. FIG. [Figure 4] FIG. 4 is a side view schematically showing an extrusion blow molded container according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an extrusion blow molded container according to an exemplary embodiment of the present invention will be described with reference to the drawings.

[0013] In this disclosure, the term "upper side" also refers to the side where the mouth of the extrusion blow-molded container is located, and the term "lower side" also refers to the side where the bottom of the blow-molded container is located. Furthermore, the axis O is the central axis of the extrusion blow-molded container. In this disclosure, the term "axial direction" refers to the direction along the axis O. In this disclosure, the term "radial direction" refers to the direction perpendicular to the axis O. In this disclosure, the term "radially inner side" refers to the side closer to the axis O of both radial sides, and the term "radially outer side" refers to the side farther from the axis O of both radial sides.

[0014] Fig. 1 discloses an extrusion blow molded container 1A according to a first embodiment of the present invention, and Fig. 2 shows an enlarged view of region A in Fig. 1.

[0015] 1, the extrusion blow-molded container 1A comprises a lower body 8 in which a vacuum absorption panel 8a is formed, and an upper body 4 arranged above the lower body 8. The extrusion blow-molded container 1A further comprises, between the lower body 8 and the upper body 4, a convex rib 6 that protrudes radially outward and extends circumferentially, and a lower concave rib 7 that is arranged below the convex rib 6, protrudes radially inward, and extends circumferentially.

[0016] The convex rib 6 is an annular convex rib that extends circumferentially around the axis O. Specifically, the convex rib 6 is formed continuously over the entire circumferential direction around the axis O. Furthermore, the lower concave rib 7 is an annular concave rib that extends circumferentially around the axis O. Specifically, the lower concave rib 7 is formed continuously over the entire circumferential direction around the axis O.

[0017] Referring to FIG. 2, the lower concave rib 7 is formed with a bottom surface portion 71, an upper inclined portion 72, and a lower inclined portion 73. The bottom surface portion 71 extends along the axial direction and is flat in side view as shown in FIG. 2. However, "extending along the axial direction" here is interpreted to mean that a slight inclination with respect to the axis O is also permitted. The upper inclined portion 72 is formed continuous with the lower end of the convex rib 6 and, as shown in FIG. 2, is linearly inclined toward the upper end 7e1 of the bottom surface portion 71 and is connected to the upper end 7e1 of the bottom surface portion 7a in side view. The lower inclined portion 73 is connected to the upper end 8e1 of the lower body portion 8 and, as shown in FIG. 2, is linearly inclined toward the lower end 7e2 of the bottom surface portion 71 and is connected to the lower end 7e2 of the bottom surface portion 7a in side view. Furthermore, here, "connected" not only means that they are connected to each other in a straight line when viewed from the side, but also means that they are connected in a curved line, as in the present disclosure.

[0018] Also, referring to Figure 1, the extrusion blow molded container 1A of this embodiment further includes an upper concave rib 5 that is positioned above the convex rib 6, protrudes radially inward, and extends circumferentially.

[0019] Referring to FIG. 2, the upper concave rib 5 is formed with a bottom surface portion 51, an upper inclined portion 52, and a lower inclined portion 53. The bottom surface portion 51 extends along the axial direction and is flat in side view as shown in FIG. 2. However, here too, "extending along the axial direction" is interpreted to mean allowing for a slight inclination with respect to the axis O. The upper inclined portion 52 is continuous with the lower end 4e2 of the upper body portion 4 and, as shown in FIG. 2, is linearly inclined toward the upper end 5e1 of the bottom surface portion 51 and is continuous with the upper end 5e1 of the bottom surface portion 51. The lower inclined portion 53 is formed continuous with the upper end of the convex rib 6 and, as shown in FIG. 2, is linearly inclined toward the lower end 5e2 of the bottom surface portion 51 and is continuous with the lower end 5e2 of the bottom surface portion 51. Also, here, "connected" not only means that they are connected to each other in a straight line when viewed from the side, but also means that they are connected in a curved line, as in the present disclosure.

[0020] 1, in the present disclosure, an extrusion blow-molded container 1A comprises a cylindrical mouth 2, a shoulder 3 connected to the lower end 2e2 of the mouth 2, an upper body 4 connected to the lower end of the shoulder 3 (the upper end 4e1 of the upper body 4), an upper concave rib 5 connected to the lower end 4e2 of the upper body 4, a convex rib 6 connected to the lower end of the upper concave rib 5, a lower concave rib 7 connected to the lower end of the convex rib 6, a lower body 8 connected to the lower end of the lower concave rib 7 (the upper end 8e1 of the lower body 8), and a bottom 9 connected to the lower end (recess 10) of the lower body 8. The bottom 9 closes the lower end of the lower body 8.

[0021] In the present disclosure, the extrusion blow-molded container 1A is a round bottle formed into a cylindrical shape. The interior of the extrusion blow-molded container 1A forms a storage space capable of storing various contents. An opening (not shown) that leads to the storage space is formed in the mouth portion 2.

[0022] In the present disclosure, the extrusion blow-molded container 1A is a heat-resistant extrusion blow-molded container. In the present disclosure, the extrusion blow-molded container 1A is made of heat-resistant polypropylene (PP) as a main raw material and is molded by extrusion blow molding. However, the main raw material is not limited to polypropylene.

[0023] In the present disclosure, the shoulder portion 3 has a polyhedral shape made up of a plurality of curved surfaces 3a. However, the shoulder portion 3 does not necessarily have to have a polyhedral shape, and various shapes such as a dome shape may be appropriately adopted.

[0024] In addition, in the present disclosure, a curvature concave rib 4a is formed on the upper body portion 4. The curvature concave rib 4a protrudes radially inward and extends circumferentially, and has an arc-shaped outline in side view as shown in FIG. 1 . In the present disclosure, the curvature concave rib 4a is an annular curvature concave rib extending circumferentially around the axis O. Specifically, the curvature concave rib 4a is formed continuously over the entire circumferential direction around the axis O. In the present disclosure, the curvature concave rib 4a has an arc-shaped outline with a given radius of curvature r. In addition, in the present disclosure, a plurality of curvature concave ribs 4a are formed at intervals in the axial direction. However, there may be at least one curvature concave rib 4a. Alternatively, the curvature concave rib 4a may be omitted.

[0025] In addition, in the present disclosure, the upper concave rib 5 is an annular concave rib extending circumferentially around the axis O. Specifically, the upper concave rib 5 is continuously formed circumferentially around the axis O. Referring to FIG. 2, in the present disclosure, the upper end of the upper concave rib 5 coincides with the lower end 4e2 of the upper body portion 4. The upper concave rib 5 is located radially inward from the upper body portion 4. In addition, in the present disclosure, the upper inclined portion 52 of the upper concave rib 5 is inclined at an angle α1 with respect to the bottom surface portion 51 (axis O). In addition, in the present disclosure, the lower inclined portion 53 of the upper concave rib 5 is inclined at an angle α2 with respect to the bottom surface portion 51 (axis O). In the present disclosure, the bottom surface portion 51 of the upper concave rib 5 is located radially inward from the curvature concave rib 4a, as shown in FIG. 1.

[0026] In addition, in the present disclosure, the convex rib 6 is an annular convex rib extending in the circumferential direction around the axis O. Referring to FIG. 2, in the present disclosure, the upper end of the convex rib 6 coincides with the lower inclined portion 53 of the upper concave rib 5. In addition, in the present disclosure, the lower end of the convex rib 6 coincides with the upper inclined portion 72 of the lower concave rib 7. In the present disclosure, the upper and lower ends of the convex rib 6 are connected by a peak extending along the axial direction in a side view as shown in FIG. 2. In addition, in the present disclosure, the convex rib 6 protrudes radially outward beyond both the upper body portion 4 and the lower body portion 8.

[0027] In addition, in the present disclosure, the lower concave rib 7 is an annular concave rib extending circumferentially around the axis O. It is an annular concave rib. In the present disclosure, the upper inclined portion 72 of the lower concave rib 7 coincides with the lower end of the convex rib 6, as described above. In addition, in the present disclosure, the upper inclined portion 72 of the lower concave rib 7 is inclined at an angle β1 with respect to the bottom surface portion 71 (axis O). In addition, in the present disclosure, the lower inclined portion 73 of the lower concave rib 7 is inclined at an angle β2 with respect to the bottom surface portion 71 (axis O). In the present disclosure, the lower end of the lower concave rib 7 coincides with the upper end 8e1 of the lower body portion 8. In the present disclosure, the lower concave rib 7 is located radially inward of the lower body portion 8. Referring to FIG. 2, in the present disclosure, the bottom surface portion 71 of the lower concave rib 7 is located radially inward of the bottom surface portion 51 of the upper concave rib 5.

[0028] 1 , in the present disclosure, the lower body portion 8 expands radially outward along the axial direction toward the bottom portion 9. In addition, in the present disclosure, a recess 10 is formed between the lower body portion 8 and the bottom portion 9. That is, in the present disclosure, the recess 10 connects the lower body portion 8 and the bottom portion 9 and is the boundary between the lower body portion 8 and the bottom portion 9. In the present disclosure, the recess 10 is an annular recess extending in the circumferential direction around the axis O.

[0029] In the present disclosure, the bottom 9 has a bottom surface 9b that is raised from the annular grounding portion 9a toward the center of the bottom. A pinch-off portion 9c is formed on the bottom surface 9b. In the present disclosure, the pinch-off portion 9c is formed in a direction that overlaps with the parting line of the blow molding die.

[0030] In the present disclosure, the lower body portion 8 is formed with multiple vacuum absorption panels 8a spaced apart circumferentially around the axis O. In the present disclosure, six vacuum absorption panels 8a are formed in the lower body portion 8. Note that in FIG. 1, three vacuum absorption panels 8a on the back side of the drawing are not visible. However, the number of vacuum absorption panels 8a is not limited to the present disclosure. For example, the number of vacuum absorption panels 8a can be at least one. When the internal pressure of the extrusion blow-molded container 1A is reduced, the vacuum absorption panel 8a deforms preferentially over other portions, thereby absorbing the reduced pressure inside the extrusion blow-molded container 1A. Furthermore, the vacuum absorption panel 8a is the portion of the entire extrusion blow-molded container 1A that is most likely to deform radially inward. Therefore, the vacuum absorption panel 8a can be given the function of discharging the contents of the extrusion blow-molded container 1A from the mouth 2 by pressing (squeezing) the vacuum absorption panel 8a from the radially outward direction. In the present disclosure, the vacuum absorption panel 8a is composed of a bottom surface 8a1 and a peripheral surface 8a2 surrounding the bottom surface 8a1. However, the shape of the vacuum absorption panel 8a can be set as appropriate. In addition, in the present disclosure, a columnar reinforcing portion 8b is formed between adjacent vacuum absorption panels 8a in the circumferential direction, reinforcing the lower body portion 8.

[0031] 1, in the present disclosure, at least a pair of vacuum absorption panels 8a are formed in a direction perpendicular to the extending direction of the pinch-off portion 9c. In FIG. 1, one of the pair of vacuum absorption panels 8a among the plurality of vacuum absorption panels 8a is designated by the reference symbol 8ax. In the present disclosure, the plurality of vacuum absorption panels 8a arranged in the lower body portion 8 each have the same shape. In the present disclosure, the plurality of vacuum absorption panels 8a arranged in the lower body portion 8 also have the same dimensions. Furthermore, in the present disclosure, the plurality of vacuum absorption panels 8a are arranged at equal intervals in the circumferential direction around the axis O.

[0032] 3, in the present disclosure, the pinch-off portion 9c extends along a radially extending line L that passes through the axis O and extends in the radial direction in a bottom view. Referring to FIG. 3, in the present disclosure, one of the pair of vacuum absorption panels 8a1 is disposed on one side in a direction perpendicular to the extending direction of the pinch-off portion 9c in a bottom view of FIG. 3, for example, in a region R1 in FIG. 3. That is, one of the pair of vacuum absorption panels 8a1 is disposed on one of both sides of the radially extending line L in a bottom view of FIG. 3. Also referring to FIG. 3, in the present disclosure, the other of the pair of vacuum absorption panels 8a1 is disposed on the other side in a direction perpendicular to the extending direction of the pinch-off portion 9c in a bottom view of FIG. 3, for example, in a region R2 in FIG. That is, the other of the pair of vacuum absorption panels 8a1 is disposed on the other side of the radially extending line L in a bottom view of FIG. 3. In other words, in the present disclosure, the vacuum absorption panels 8a1 are formed as a pair at a position 90 degrees from the extension direction of the pinch-off portion 9c when viewed from the bottom as shown in Figure 3, and at positions facing each other across the pinch-off portion 9c.

[0033] As shown in FIG. 1, the extrusion blow-molded container 1A includes a convex rib 6 and a lower concave rib 7 located below the convex rib 6 between the lower body 8 and the upper body 4. As shown in FIG. 2, the lower concave rib 7 has a trapezoidal outline formed by a bottom surface 71, an upper inclined portion 72, and a lower inclined portion 73 in a side view. This configuration allows the extrusion blow-molded container 1A to enhance the rigidity between the lower body 8 and the upper body 4. Therefore, even when the internal pressure of the extrusion blow-molded container 1A is reduced, the entire extrusion blow-molded container 1A can be prevented from deforming, for example, into an elliptical shape in the circumferential direction around the central axis of the container. Therefore, the extrusion blow-molded container 1A can be prevented from deforming as a whole. Furthermore, this prevents portions other than the vacuum absorption panel 8a from deforming before the vacuum absorption panel 8a. Therefore, according to the extrusion blow molded container 1A, the vacuum absorption panel 8a can function effectively.

[0034] Furthermore, the radial rigidity of the extrusion blow-molded container 1A is improved by forming the inclined portions (72, 73) on the lower concave rib 7. As a result, the extrusion blow-molded container 1A exhibits a stronger resistance to radial deformation than, for example, a concave rib formed by curvature (e.g., the curvature concave rib 4a). Furthermore, in the extrusion blow-molded container 1A, the convex rib 6 is formed so as to be continuous with the lower concave rib 7, thereby exhibiting a stronger resistance to stress that tends to cause elliptical deformation, and the entire body of the extrusion blow-molded container 1A can be made stronger.

[0035] In addition, in the present disclosure, the extrusion blow-molded container 1A further includes an upper concave rib 5 located above the convex rib 6, and the upper concave rib 5 has a trapezoidal outline formed by a bottom surface portion 51, an upper inclined portion 52, and a lower inclined portion 53 in side view as shown in FIG. 2. This can further increase the rigidity between the lower body portion 8 and the upper body portion 4. Therefore, the blow-molded container 1A further suppresses deformation of the entire extrusion blow-molded container 1A.

[0036] 1, in the extrusion blow molded container 1A, a curved concave rib 4a is formed in the upper body portion 4. By forming the curved concave rib 4a formed only by curvature in the upper body portion 4 in this way, it is possible to suppress a decrease in buckling strength compared to when the upper body portion 4 is formed with a concave rib formed by a flat bottom surface portion and an inclined portion.

[0037] Furthermore, in the extrusion blow-molded container 1A, at least one pair of vacuum absorption panels 8ax are formed in a direction perpendicular to the extending direction of the pinch-off portion 9c. Here, the pinch-off portion 9c is a portion that is held by being sandwiched between the mating surfaces of the mold. Therefore, referring to the bottom view of FIG. 3, the extending axis of the pinch-off portion 9c (radial extending line L) is less likely to be stretched during extrusion blow molding than in a direction perpendicular to the extending axis of the pinch-off portion 9c. Therefore, the wall thickness in the direction perpendicular to the extending axis of the pinch-off portion 9c (the wall thickness of the portion corresponding to regions R1 and R2 in FIG. 3) is thinner than the wall thickness along the extending axis of the pinch-off portion 9c (the wall thickness of the portion corresponding to region R3 in FIG. 3). Therefore, if the vacuum absorption panel 8ax is formed in a direction perpendicular to the extending direction of the pinch-off portion 9c as in the present disclosure, the vacuum absorption panel 8ax can be more easily deformed.

[0038] Furthermore, when the positional relationship with the pinch-off portion 9c is taken into consideration, it is particularly preferable that the number of vacuum absorption panels 8a be two or a multiple of six. When the positional relationship between the vacuum absorption panels 8a and the pinch-off portion 9c is taken into consideration, for the reasons described above, it is preferable that the vacuum absorption panels 8a are not formed in a position that includes the axis of extension (radial extension line L) of the pinch-off portion 9c when viewed from the bottom in Figure 3, for example, in the position of region R3 in Figure 3, as in the present disclosure. When the number of vacuum absorption panels 8a is two or a multiple of six, as in the present disclosure, the vacuum absorption panels 8a can be easily arranged in a position that avoids region R3 in Figure 3.

[0039] 4 is a side view schematically showing an extrusion blow molded container 1B according to a second embodiment of the present invention. In the following description, the same reference numerals are used for parts that are substantially the same as those in the extrusion blow molded container 1A, and the description thereof will be omitted.

[0040] In the extrusion blow-molded container 1B, the upper concave rib 5 of the extrusion blow-molded container 1A is omitted. That is, in the extrusion blow-molded container 1B, the upper end of the convex rib 6 is continuous with the lower end 4e2 of the upper body portion 4. In the present disclosure, the upper end of the convex rib 6 is configured similarly to the lower inclined portion 53 of the upper concave rib 5 in the extrusion blow-molded container 1A. That is, in the present disclosure, the upper end of the convex rib 6 is linearly inclined toward the lower end 4e2 of the upper body portion 4 in a side view and is continuous with the lower end 4e2 of the upper body portion 4.

[0041] The blow-molded container 1B also has a convex rib 6 and a lower concave rib 7, and the lower concave rib 7 has a trapezoidal outline formed by a bottom surface portion 71, an upper inclined portion 72, and a lower inclined portion 73 in a side view. This configuration also enhances the rigidity of the blow-molded container 1B between the lower body portion 8 and the upper body portion 4. Therefore, similar to the extrusion blow-molded container 1A, the blow-molded container 1B as a whole does not deform, for example, into an elliptical shape in the circumferential direction around the central axis of the container, even when the internal pressure of the extrusion blow-molded container 1B is reduced. Therefore, the extrusion blow-molded container 1A suppresses deformation of the entire extrusion blow-molded container 1A.

[0042] The above describes exemplary embodiments of the present invention, and various modifications can be made without departing from the scope of the claims. For example, the various configurations employed in the above-described embodiments can be substituted for or combined with each other as appropriate. [Explanation of symbols]

[0043] 1A: extrusion blow molded container (first embodiment), 1B: extrusion blow molded container (second embodiment), 2: mouth portion, 3: shoulder portion, 4: upper body portion, 4e2: lower end of upper body portion, 4a: curved concave rib, 5: upper concave rib, 51: bottom surface portion of upper concave rib, 5e1: upper end of bottom surface portion of upper concave rib, 5e2: lower end of bottom surface portion of upper concave rib, 52: upper inclined portion of upper concave rib, 53: lower inclined portion of upper concave rib, 6: convex rib, 7: lower concave rib, 71: bottom surface portion of lower concave rib, 7e1: ​​upper end of bottom surface portion of lower concave rib, 7e2: lower end of bottom surface portion of lower concave rib, 72: upper inclined portion of lower concave rib, 73: lower inclined portion of lower concave rib, 8: lower body portion, 8a: vacuum absorption panel, 8a1: pair of vacuum absorption panels, 8e1: upper end of lower body, 9: bottom, 9a: ground contact portion, 9b: raised bottom surface, 9c: pinch-off portion

Claims

1. 1. An extrusion blow-molded container comprising: a lower body portion having a plurality of vacuum absorption panels formed at intervals in the circumferential direction; and an upper body portion disposed above the lower body portion, The extrusion blow-molded container further includes, between the lower body portion and the upper body portion, a convex rib that protrudes radially outward and extends circumferentially, and a lower concave rib that is disposed below the convex rib, protrudes radially inward, and extends circumferentially, The lower concave rib is formed with a bottom surface portion that extends along the axial direction in side view and is formed flat, an upper inclined portion that is formed continuously with the lower end of the convex rib and that is linearly inclined toward the upper end of the bottom surface portion in side view and is connected to the upper end of the bottom surface portion, and a lower inclined portion that is connected to the upper end of a columnar reinforcing portion formed between the plurality of vacuum absorption panels in the lower body portion and that is linearly inclined toward the lower end of the bottom surface portion in side view and is connected to the lower end of the bottom surface portion, The extrusion blow molded container has at least one pair of vacuum absorption panels formed in a direction perpendicular to the extending direction of the pinch-off portion.

2. the extrusion blow-molded container further includes an upper concave rib disposed above the convex rib, protruding radially inward, and extending circumferentially; 2. The extrusion blow molded container according to claim 1, wherein the upper concave rib is formed of: a bottom portion that extends along the axial direction in a side view and is formed flat; an upper inclined portion that is connected to the lower end of the upper body portion, that is linearly inclined toward the upper end of the bottom portion in a side view, and that is connected to the upper end of the bottom portion; and a lower inclined portion that is formed continuously with the upper end of the convex rib, that is linearly inclined toward the lower end of the bottom portion in a side view, and that is connected to the lower end of the bottom portion.

3. 3. The extrusion blow molded container according to claim 1, wherein the upper body portion is formed with a curved concave rib that protrudes radially inward, extends circumferentially, and has an arc-shaped shape in side view.

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