Container made of synthetic resin

Abstract

To provide a container made of a synthetic resin, in which stability (stable handling) can be excellently maintained when internal pressure rises.SOLUTION: A synthetic resin-made container 1 has a mouth part 2, a barrel part 3, and a bottom part 4 linked in this order. The barrel part 3 is smooth. The bottom part 4 has a bottom face outer peripheral region 4a having a grounding part 4a1, and a central recess portion 4b dented toward the inside of the container from the inner peripheral edge of the bottom face outer peripheral region 4a toward the center of the bottom part 4. The central recess portion 4b has a straight line-shaped shut-off portion 4b1 formed by extrusion blow-molding. Portions excluding the shut-off portion 4b1 are smooth. The bottom face outer peripheral region 4a has at least one of each of a first recess portion 4a2 disposed on a first vertical line 5a extending from the shut-off portion 4b1 to one side perpendicularly to the shut-off portion 4b1, and a second recess portion 4a3 disposed on a second vertical line 5b extending from the shut-off portion 4b1 to the other side perpendicularly to the shut-off portion 4b1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a synthetic resin container. [Background technology]

[0002] BACKGROUND ART A synthetic resin container is known which has a mouth, a body, and a bottom connected in this order, with the body being smooth (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-174290 Summary of the Invention [Problem to be solved by the invention]

[0004] When the above-mentioned synthetic resin container has a configuration in which a straight-line cut-off portion is formed at the bottom by extrusion blow molding, if not only the body portion is smooth but also the bottom portion is smooth except for the cut-off portion, when the internal pressure of the synthetic resin container increases, the bottom portion will deform downward, causing the contact portion to deform and affecting the stability (settling) of the container.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a synthetic resin container that can maintain good stability (settlement) of the container when the internal pressure rises. [Means for solving the problem]

[0006] One aspect of the present invention is as follows.

[0007] [1] The container has a mouth, a body, and a bottom, connected in this order; The body is smooth, the bottom portion has a bottom outer peripheral region having a ground contact portion, and a central recess portion recessed from an inner peripheral edge of the bottom outer peripheral region toward the center of the bottom portion toward the inside of the container, the central recess has a straight edge cutout formed by extrusion blow molding, and the portion other than the edge cutout is smooth; The bottom outer peripheral region has one or more first recesses provided on a first vertical line extending from the food cut-off portion to one side perpendicular to the food cut-off portion, and one or more second recesses provided on a second vertical line extending from the food cut-off portion to the other side perpendicular to the food cut-off portion.

[0008] [2] The synthetic resin container described in [1], wherein one of the first vertical lines and one of the second vertical lines constitute a central vertical line that passes through the center of the bottom and is perpendicular to the cut-off portion. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a synthetic resin container that can maintain good stability (settlement) of the container when the internal pressure rises. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view showing a synthetic resin container according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a partially enlarged view of FIG. [Figure 3] FIG. 2 is a bottom view of the synthetic resin container shown in FIG. [Figure 4] FIG. 4 is a side view showing a synthetic resin container according to a second embodiment of the present invention. [Figure 5] FIG. 5 is a partially enlarged view of FIG. [Figure 6] FIG. 5 is a bottom view of the synthetic resin container shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] As shown in FIGS. 1 to 3, in the first embodiment of the present invention, a synthetic resin container 1 has a mouth 2, a body 3, and a bottom 4 connected in this order. The body 3 is cylindrical and smooth (i.e., has no irregularities such as circumferential ribs or vacuum absorption panels). The bottom 4 has a bottom outer peripheral region 4a having a ground contact portion 4a1 and a central recess 4b recessed inward from the inner peripheral edge of the bottom outer peripheral region 4a toward the center of the bottom 4. The central recess 4b is formed by extrusion blow molding and protrudes downward. The outer circumferential region 4a of the bottom surface has one or more first recesses 4a2 recessed toward the inside of the container on a first vertical line 5a extending from the cut-off portion 4b1 to one side perpendicular to the cut-off portion 4b1 in a bottom view, and one or more second recesses 4a3 recessed toward the inside of the container on a second vertical line 5b extending from the cut-off portion 4b1 to the other side perpendicular to the cut-off portion 4b1 in a bottom view. In this embodiment, the direction along the central axis O of the body 3 is called the axial direction, the direction perpendicular to the central axis O is called the radial direction, and the direction going around the central axis O is called the circumferential direction. In this embodiment, the body 3 has a shoulder region 3a that widens downward from the lower end of the mouth 2, and a body main region 3b that extends downward from the lower end of the shoulder region 3a to the bottom 4, but this is not limited to this. Furthermore, the body 3 has a circular cylindrical shape when viewed from above, but is not limited to this and may have an elliptical cylindrical shape when viewed from above, for example.

[0013] When the internal pressure of the synthetic resin container 1 increases due to, for example, filling the container with gas-generating contents or rising internal temperature, the bottom 4 may deform downward, causing the contact portion 4a1 to deform, which may affect the stability (settlement) of the synthetic resin container 1. In this embodiment, because the bottom 4 has the straight-shaped cut-off portion 4b1, the downward deformation of the bottom 4 when the internal pressure increases is greater in a vertical cross section perpendicular to the cut-off portion 4b1 than in a vertical cross section along the cut-off portion 4b1. Therefore, the above-described configuration, which includes the first recess 4a2 and the second recess 4a3 that can reinforce the bottom outer peripheral region 4a at the portion that is the origin of the bending deformation in the vertical cross section perpendicular to the cut-off portion 4b1, suppresses the bending deformation, thereby maintaining the stability of the synthetic resin container 1.

[0014] The one first vertical line 5a and the one second vertical line 5b constitute a central vertical line 5 that passes through the center of the bottom portion 4 in a bottom view and is perpendicular to the cut-off portion 4b1. Since the amount of bending deformation of the bottom portion 4 when the internal pressure increases is greatest in the vertical cross section along the central vertical line 5, the above configuration in which the first recess 4a2 and the second recess 4a3 are provided on the central vertical line 5 can further improve the stability of the synthetic resin container 1.

[0015] The synthetic resin container 1 has three or more first recesses 4a2 provided at predetermined intervals in the circumferential direction, and the same number of second recesses 4a3 as the first recesses 4a2 provided at the same predetermined intervals in the circumferential direction. According to the above configuration, the three or more first recesses 4a2 and the three or more second recesses 4a3 are provided in a balanced manner in the bottom outer peripheral region 4a, which further improves the stability of the synthetic resin container 1.

[0016] It is preferable that the first recess 4a2 and the second recess 4a3 are provided symmetrically with respect to the cut-off portion 4b1 as in this embodiment, but this is not limiting.

[0017] The bottom peripheral region 4a has a third recess 4a4 on one side of the cut-off portion 4b1 in the extending direction of the cut-off portion 4b1 and a fourth recess 4a5 on the other side of the cut-off portion 4b1. This configuration allows the third recess 4a4 and the fourth recess 4a5 to suppress downward bending deformation in a vertical cross section along the extending direction of the cut-off portion 4b1 when internal pressure increases, thereby further maintaining the stability of the synthetic resin container 1. The third recess 4a4 and the fourth recess 4a5 are also provided in the second embodiment described below.

[0018] The number, size, shape, and arrangement of the first recesses 4a2 and second recesses 4a3 provided in the bottom outer peripheral region 4a are not particularly limited as long as the bottom outer peripheral region 4a has the first recesses 4a2 provided on a first vertical line 5a extending from the edge 4b1 to one side perpendicular to the edge 4b1 and the second recesses 4a3 provided on a second vertical line 5b extending from the edge 4b1 to the other side perpendicular to the edge 4b1 in a bottom view, and may be, for example, as in the second embodiment shown in Figures 4 to 6. In the first embodiment, three first recesses 4a2 and seven second recesses 4a3 are provided, whereas in the second embodiment, seven first recesses 4a2 and seven second recesses 4a3 are provided. In the first embodiment, each recess is round in bottom view, whereas in the second embodiment, each recess is generally rectangular in bottom view. In the first embodiment, each recess is located within the outer periphery of the bottom surface in bottom view, whereas in the second embodiment, each recess is located in the range extending to the outer periphery of the bottom surface in bottom view. The number of first recesses 4a2 provided in the bottom surface outer peripheral region 4a is preferably the same as the number of second recesses 4a3 provided in the bottom surface outer peripheral region 4a, as in the first and second embodiments, but is not limited to this.

[0019] The outer peripheral surface of the mouth 2 has a receiving portion 2a to which a cap (not shown) is attached by engaging the concave and convex portions. In this embodiment, the receiving portion 2a is configured to receive the cap by screwing, but this is not limited thereto, and the cap may be attached by, for example, stoppering. The cap may be a nozzle member that dispenses the contents of the synthetic resin container 1 by squeezing or tilting the synthetic resin container 1, or an attachment cap that attaches to the mouth 2 a push-down or trigger-type pump that dispenses the contents of the synthetic resin container 1, or a closure cap that is attached to and detached from the mouth 2 to open and close the mouth 2. The contents are not particularly limited, and may be, for example, a food product such as a fermented food product.

[0020] In this embodiment, the synthetic resin container 1 is made of a polyolefin such as polyethylene (PE) or polypropylene (PP), but is not limited to this.

[0021] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be modified in various ways without departing from the gist of the present invention. [Example]

[0022] As synthetic resin containers, Example 1 having the shape of the first embodiment and Example 2 having the shape of the second embodiment were produced, and after filling them with 220 ml of water, air was injected into each to measure the internal pressure and the amount of bottom falling (amount of downward displacement at the center of the bottom), and the stability of the synthetic resin containers was evaluated based on the amount of bottom falling when 30 ml of air was injected.

[0023] As a comparative example, measurements and evaluations were carried out under the same conditions as in Examples 1 and 2, except that neither the first recess nor the second recess was provided. The results are shown in Table 1. As can be seen from Table 1, it was confirmed that good stability could be obtained by providing the first recess and the second recess.

[0024] [Table 1] [Explanation of symbols]

[0025] 1. Synthetic resin containers 2 Mouth 2a Attached part 3. Torso 3a shoulder area 3b Torso body area 4 Bottom 4a Bottom outer area 4a1 Ground contact area 4a2 First recess 4a3 Second recess 4a4 Third recess 4a5 4th recess 4b Central recess 4b1 Meat cutting section 5 Center vertical straight line 5a 1st vertical line 5b 2nd vertical line O center axis

Claims

1. The container has a mouth, a body, and a bottom, connected in this order; The body is smooth, the bottom portion has a bottom outer peripheral region having a ground contact portion, and a central recess portion recessed from an inner peripheral edge of the bottom outer peripheral region toward the center of the bottom portion toward the inside of the container, the central recess has a straight edge cutout formed by extrusion blow molding, and the portion other than the edge cutout is smooth; The bottom outer peripheral region has one or more first recesses provided on a first vertical line extending from the food cut-off portion to one side perpendicular to the food cut-off portion, and one or more second recesses provided on a second vertical line extending from the food cut-off portion to the other side perpendicular to the food cut-off portion.

2. 2. The synthetic resin container according to claim 1, wherein one of the first vertical lines and one of the second vertical lines constitute a central vertical line that passes through the center of the bottom portion and is perpendicular to the cut-off portion.

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