JP6958190B2 - Lightweight PET bottle - Google Patents

Description

The present invention relates to a plastic container such as a lightweight PET bottle, particularly a lightweight PET bottle having improved buckling strength although it is a lightweight container.

When selling lightweight PET bottles at a vending machine, since the lightweight PET bottles are stacked horizontally, it is desirable that there is little deformation due to a lateral load (strong side wall strength). When the lightweight PET bottle is tilted sideways and a load is applied, the lightweight PET bottle is compressed and at the same time the bottom surface is inverted and pops out, and the lightweight PET bottle is greatly deformed. As a countermeasure, it was effective to provide a radial groove on the bottom surface to improve the strength of the bottom portion.

When a vertically downward load was applied to the lightweight PET bottle in order to evaluate the buckling strength, the heel portion of the lightweight PET bottle was first elastically deformed, and the shoulder portion was buckled so as to be crushed.

Japanese Unexamined Patent Publication No. 2015-202880

From this, it is effective to provide a radial groove on the bottom surface of the lightweight PET bottle, but when the radial groove on the bottom surface of the lightweight PET bottle reaches the heel portion of the lightweight PET bottle, the groove is first deformed. Therefore, the buckling strength tends to be weakened. Strengthening such buckling strength has been an issue.

Therefore, the invention according to claim 1 is a lightweight PET bottle composed of a mouth portion, a shoulder portion, a body portion, a heel portion, and a bottom surface portion, and the boundary between the heel portion and the bottom surface portion is a ground contact surface of the lightweight PET bottle. The bottom surface is the center side of the lightweight PET bottle from the ground surface, the heel part is the part that rises from the ground surface toward the mouth, and the bottom surface is the dish-shaped part that is recessed in a dish shape. from has been constructed and a further recessed center portion of central therein, the dish-shaped portion of the bottom surface portion, radial grooves are provided toward the center portion, radial grooves with the center portion and the end portion is configured, the central portion is lowered obliquely downward from the central portion, the terminating portion extending parallel to the ground plane, the end of the end portion than towards the outside than the ground surface, provides a lightweight PET bottle you opening beneath the heel do.

The present invention is a lightweight PET bottle composed of a mouth portion, a shoulder portion, a body portion, a heel portion, and a bottom surface portion, and the boundary between the heel portion and the bottom surface portion is a ground contact surface of the lightweight PET bottle. the center of the light PET bottle and the bottom portion, and a heel portion a portion standing up towards the mouth in the outer side of the ground plane, the bottom part, further recessed in central therein and dish recessed dish It is composed of a central part, and a radial groove is provided toward the central part in the dish-shaped part of the bottom part, and the radial groove is composed of a central part and an end part, and the central part is the center. parts and from lowered obliquely downward, the end portions extending parallel to the ground plane, the end of the end portion than towards the outside than the ground plane, so that said opening be Rukoto below the heel portion, the side wall strength and buckling It has become possible to strengthen the strength.

Further, the present invention is characterized in that the lightweight PET bottle has a value of the content volume (ml) of the bottle / body weight (g) of the bottle of 50 or more. Even with such a lightweight PET bottle, the above configuration has an effect on buckling and side wall strength.

(A) is a front view of an example lightweight PET bottle, (b) is a cross-sectional view of a bottom surface portion and a heel portion of line AA of (c), and (c) is a bottom view. It is explanatory perspective view near the bottom view of the Example of this invention of FIG. (A) is a front view of the lightweight PET bottle of Comparative Example 1, (b) is a cross-sectional view of a bottom surface portion and a heel portion of line BB of (c), and (c) is a bottom view. It is explanatory perspective view near the bottom view of the comparative example 1 of FIG. (A) is a front view of the lightweight PET bottle of Comparative Example 2, (b) is a cross-sectional view of a bottom surface portion and a heel portion of the CC line of (c), and (c) is a bottom view. It is explanatory perspective view near the bottom view of the comparative example 2 of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a lightweight PET bottle according to an embodiment of the present invention, FIG. 1A is a front view of the lightweight PET bottle according to an embodiment, and FIG. 1B is a bottom surface portion of line AA of FIG. A cross-sectional view of the heel portion and the heel portion (c) are bottom views. Similarly, FIG. 2 is an explanatory perspective view of the vicinity of the bottom view of the embodiment of the present invention of FIG.

Explaining with reference to FIG. 1A, the lightweight PET bottle 10 of the embodiment of the present invention is composed of a mouth portion 12, a shoulder portion 14, a body portion 16, a heel portion 18, and a bottom portion 20 from above. Regarding the boundary between the heel portion 18 and the bottom surface portion 20, the bottom surface portion 20 is located on the center side of the lightweight PET bottle from the ground contact surface 20G (see FIG. 1 (b)) of the lightweight PET bottle, and the mouth portion is outside the ground contact surface 20G. The portion that stands up toward the heel is the heel portion 18. The bottom surface portion 20 is composed of a dish-shaped portion 20D recessed in a dish shape and a further recessed central portion 20C of the central portion thereof. The dish-shaped portion 20D of the bottom surface portion 20 is provided with a radial groove 22 connected to the central portion 20C.

The central portion 22C of each radial groove 22 is recessed and is connected to the central portion 20C of the dish-shaped portion 20D. The central portion 22C descends diagonally downward from the central portion 20C, and is parallel to the ground plane 20G at the terminal portion 22E. The radial groove 22 ends near the ground contact surface 20G, and is not provided so as to stand up toward the heel portion 18.

In this embodiment, six radial grooves 22 are provided radially from the central portion 22C.

The shape of the radial groove 22 may be any shape as long as the radial groove is provided from the apex of the polygon toward the center point. Depending on the number of polygons, the number may be 3, 4, 5, 6, 7, 8 or more. Also, the radial grooves do not have to be evenly spaced. Further, it may be provided regularly or irregularly from the circumferential portion toward the center point.

FIG. 3 is a lightweight PET bottle of Comparative Example 1 of the present invention, FIG. 3 (a) is a front view of the lightweight PET bottle of Comparative Example 1, and FIG. 3 (b) is a line BB of the same (c). A cross-sectional view of the bottom surface portion and the heel portion of the above (c) is a bottom view. Similarly, FIG. 4 is an explanatory perspective view near the bottom view of Comparative Example 1 of FIG. Since the basic configuration of the lightweight PET bottle of Comparative Example 1 is the same as that of the lightweight PET bottle of the embodiment of the present invention, the reference numerals are used (lightweight PET bottle 10, mouth 12, shoulder 14, body). Part 16, heel part 18, bottom part 20). The boundary between the heel portion 18 and the bottom surface portion 20 is the ground contact surface 20G of the lightweight PET bottle. The bottom surface portion 20 is composed of a dish-shaped portion 20D recessed in a dish shape and a further recessed central portion 20C of the central portion thereof.

Here, a radial groove 32 is connected to the central portion 20C in the dish-shaped portion 20D of the bottom surface portion 20. However, the terminal portion 32E of the radial groove 32 stays at the inner portion of the dish-shaped portion 20D, and is far inside the ground contact surface 20G.

The central portion 32C of the radial groove 32 descends obliquely downward from the central portion 20C of the dish-shaped portion 20D to form a terminal portion 32E.

FIG. 5 is a lightweight PET bottle of Comparative Example 2 of the present invention, FIG. 5 (a) is a front view of the lightweight PET bottle of Comparative Example 2, and FIG. 5 (b) is a line CC of the same (c). A cross-sectional view of the bottom surface portion and the heel portion of the above (c) is a bottom view. Similarly, FIG. 6 is an explanatory perspective view near the bottom view of Comparative Example 2 of FIG. Since the basic configuration of the lightweight PET bottle of Comparative Example 2 is the same as that of the lightweight PET bottle of the embodiment of the present invention, the reference numerals are used (lightweight PET bottle 10, mouth 12, shoulder 14, body). Part 16, heel part 18, bottom part 20). The boundary between the heel portion 18 and the bottom surface portion 20 is the ground contact surface 20G of the lightweight PET bottle. The bottom surface portion 20 is composed of a dish-shaped portion 20D recessed in a dish shape and a further recessed central portion 20C of the central portion thereof.

Here, a radial groove 42 is connected to the central portion 20C in the dish-shaped portion 20D of the bottom surface portion 20. However, the terminal portion 42E of the radial groove 42 rises beyond the ground contact surface 20G to the heel portion 18.

The central portion 42C of the radial groove 42 descends obliquely downward from the central portion 20C of the dish-shaped portion 20D, rises upward beyond the ground contact surface 20G, and becomes the terminal portion 42E.

The lightweight PET bottle in the present invention means that the content of the bottle (ml) / the weight of the body of the bottle (g) is 50 or more.

Specific examples of lightweight PET bottles are shown in Table 1. From such a specific example, the lightweight PET bottle is based on the above criteria.

The summary of the evaluation results for the examples of FIGS. 1 and 2, the comparative example 1 of FIGS. 3 and 4, and the comparative example 2 of FIGS. 5 and 6, is the result of Table 2.

Details of the side wall strength in Table 2 are shown in Table 3.

As for the side wall strength, when a lightweight PET bottle is sold at a vending machine, the containers are stacked side by side, so it is desirable that there is little deformation due to a lateral load (the side wall strength is strong).

Therefore, a lightweight PET bottle was filled with water, closed, the bottle was laid down, a load was applied, and the amount of deformation at a load of 39.2 N was measured. This time, the amount of deformation of 9 mm or less was accepted.

For the measurement of buckling strength, TOP LOAD TESTER MODEL NO., A tester manufactured by Agr Top Wave. C506-02-0001 was used.

When a lateral load is applied to the lightweight PET bottle, the water pressure inside the lightweight PET bottle rises, which applies an inner pressure to the bottom surface of the lightweight PET bottle. At this time, in Comparative Example 1, since the bottom surface of the bottle is inverted (the bottom is projected), the amount of deformation of the body diameter becomes large.

In the second embodiment and the second comparative example, since the bottom surface of the bottle has a groove, the bottom surface of the bottle is not inverted and the amount of deformation of the body is relatively small.

The details of the buckling strength in Table 2 are as shown in Tables 4, 5, and 6. The buckling referred to in the present specification is a so-called plastic buckling in which all of them are plastically deformed and cannot be restored.

A lightweight PET bottle was filled with water, closed, and a vertical load was applied. For the measurement of buckling strength, TOP LOAD TESTER MODEL NO., A tester manufactured by Agr Top Wave. C506-02-0001 was used. When a vertical load is applied to the lightweight PET bottle, the heel portion of the lightweight PET bottle begins to be compressed and deformed.

In Comparative Example 2, since the heel portion is provided with a groove, the groove in the heel portion is first broken when a vertical load is applied, and this is the peak buckling. That is, it buckles faster than in Examples and Comparative Example 1. There is also a method of making the load resistant by providing a deep circumferential groove on the body of the bottle so that the deep circumferential groove collapses before the heel when a vertical load is applied. In the method, when the label is attached to the bottle, the portion of the deep groove having a circumferential shape is deformed. Therefore, the label does not look good because the label is wrinkled or the label is dented at the deep groove of the circumference.

The present invention is not limited to the above-mentioned examples, and can take any form within a range that does not deviate from the gist of the invention. For example, in the present embodiment, the number of radial grooves is 6, but the number may be 3, 4, 5, 7, or more. Also, the radial grooves do not have to be evenly spaced.

The present invention can be applied to any lightweight PET bottle regardless of its size.

10 Lightweight PET bottle 12 Mouth 14 Shoulder 16 Body 18 Heel 20 Bottom 20G Ground plane 20D Dish 20C Central 22 Radial groove 22C Central 22E Termination 32 Radial groove 32C Central 32E Termination 42 Radial groove 42C center part 42E end part

Claims (2)

It is a lightweight PET bottle composed of a mouth, shoulder, body, heel, and bottom surface, and the boundary between the heel and bottom surface is the ground contact surface of the lightweight PET bottle. the center side and bottom portions, and portions heel portion rises towards the mouth in the outer side of the ground plane, a bottom portion, the dish recessed dish and further recessed center portion of central therein The dish-shaped portion on the bottom surface is provided with a radial groove toward the center, and the radial groove is composed of a central portion and an end portion, and the central portion is diagonally downward from the central portion. descends, the end portion extends parallel to the ground plane, the end of the end portion than towards the outside than the ground plane, lightweight PET bottles, wherein openings to Rukoto below the heel. The lightweight PET bottle is the lightweight PET bottle according to claim 1, wherein the value of the content volume (ml) of the bottle / the body weight (g) of the bottle is 50 or more.

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