CN115768690A

CN115768690A - Plastic bottle

Info

Publication number: CN115768690A
Application number: CN202180044515.XA
Authority: CN
Inventors: 清水雄三; 小林俊也; 松竹直斗
Original assignee: Suntory Holdings Ltd
Current assignee: Suntory Holdings Ltd
Priority date: 2020-06-22
Filing date: 2021-06-11
Publication date: 2023-03-07
Also published as: JP7370300B2; WO2021261290A1; JP2022001501A

Abstract

A plastic bottle having a petal-shaped bottom (4), wherein the bottom (4) has: a plurality of recessed portions (6) extending radially from a central portion (41) of the bottom portion (4); and a plurality of legs (5) separated from each other by the recesses (6), at least one of the recesses (6) being provided with a rib (61) that is recessed inward of the bottom (4), the rib (61) being divided into a plurality of portions (61 a, 61 b) in the direction in which the recess (6) extends.

Description

Plastic bottle

Technical Field

The present invention relates to a plastic bottle.

Background

Plastic bottles are commonly used as containers for liquid products such as beverages. Here, depending on the conditions of the product to be filled, the filling method, and the like, the internal pressure of the plastic bottle may increase. In order to maintain good appearance and good flow properties of products, plastic bottles used for such applications are required to be free from deformation even when the internal pressure is increased. As a characteristic shape of a plastic bottle that can resist an increase in internal pressure, a plastic bottle having a bottom portion in a so-called petal shape is used as disclosed in japanese patent application publication No. 2013-525212 (patent document 1) and the like.

Patent document

Patent document 1: japanese patent application publication No. 2013-525212 (or U.S. patent application publication No. 2013/0043255)

Disclosure of Invention

However, even in the conventional plastic bottle having a petal-shaped bottom, the pressure resistance may be insufficient. In addition, it is sometimes difficult for conventional plastic bottles to have high impact resistance in addition to high pressure resistance. A plastic bottle having low impact resistance may be damaged by dropping during transportation.

Accordingly, it is desired to provide a plastic bottle having a higher impact resistance while further improving the pressure resistance.

The present invention relates to a plastic bottle having a petal-shaped bottom, the bottom having: a plurality of concave portions extending radially from a central portion of the bottom; and a plurality of legs separated from each other by the recesses, at least one of the recesses being provided with a rib that is retracted inward of the bottom portion, the rib being divided into a plurality of portions in an extending direction of the recess.

With this structure, the pressure resistance can be further improved and the impact resistance can be increased. In particular, since the indented ribs divided by the recessed portions are provided, higher pressure resistance and impact resistance can be achieved as compared with the case where, for example, protruding ribs are provided.

Hereinafter, a preferred embodiment of the present invention will be described. However, the scope of the present invention is not limited to the following examples of suitable embodiments.

In one aspect of the plastic bottle according to the present invention, it is preferable that all of the recesses include the rib.

According to the above configuration, since the recessed beads are provided in divided portions, the effect of improving the pressure resistance and the impact resistance is more remarkable.

As one aspect of the plastic bottle according to the present invention, it is preferable that 5 or more to 7 or less legs be provided.

With this structure, the pressure resistance is easily further improved.

In one aspect of the plastic bottle according to the present invention, the rib is preferably divided into two parts in an extending direction of the concave portion.

With this structure, the pressure resistance is easily further improved.

In one aspect of the plastic bottle according to the present invention, each portion of the bead divided into a plurality of portions is preferably in a rounded rectangular shape or an elliptical shape when viewed from an axial lower side of the plastic bottle.

With this structure, the pressure resistance is easily further improved. In addition, impact resistance is also easily improved.

Further features and advantages of the present invention will become more apparent from the following description of exemplary, non-limiting embodiments thereof, which is described with reference to the accompanying drawings.

Drawings

Fig. 1 is a front view of a plastic bottle according to an embodiment of the present invention.

Fig. 2 is a perspective view of the bottom of a plastic bottle according to an embodiment of the present invention.

Fig. 3 is a bottom view of a plastic bottle according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of the bottom of a plastic bottle according to an embodiment of the present invention.

Fig. 5 is a perspective view of the bottom of the plastic bottle of comparative example 1.

Fig. 6 is a perspective view of the bottom of the plastic bottle of comparative example 2.

Detailed Description

Basic structure of plastic bottle

An embodiment of a plastic bottle according to the present invention will be described with reference to the drawings. As shown in fig. 1, a plastic bottle 100 according to the present embodiment (hereinafter, simply referred to as a bottle 100) includes a mouth portion 1 serving as a liquid inlet, a shoulder portion 2 continuous with the mouth portion 1 and gradually expanding in diameter in a bottom surface direction, a cylindrical body portion 3 continuous with the shoulder portion 2, and a bottom portion 4 serving as a bottom of the bottle 100. In the following description, "up and down" means that the mouth portion 1 side of the bottle 100 is defined as "up" and the bottom portion 4 side is defined as "down".

The bottle 100 can be integrally molded by an extension molding method such as biaxial extension blow molding using a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material. The capacity of the bottle 100 is not particularly limited, and may be about 200mL to 2L such as 280mL, 350mL, or 500mL which are generally distributed. The liquid to be filled in the bottle 100 is not particularly limited, and examples thereof include soft drinks (carbonated beverages, fruit beverages, coffee beverages, tea beverages, mineral water, soy milk beverages, vegetable beverages, sports drinks, cocoa beverages, and the like), beverages such as alcoholic beverages and dairy drinks, liquid foods such as soups, and liquid seasonings such as sauces and soy sauces. In the following embodiments, a case where bottle 100 is made of polyethylene terephthalate and has an internal volume of 450mL will be described as an example.

As shown in fig. 1 to 4, the bottom 4 of the bottle 100 is formed in a petal shape having a plurality of legs 5 and a recess 6 provided between the legs 5. Further, since the bottom portion 4 is formed in a petal shape, the bottle 100 is less likely to be deformed even when the internal pressure is positive. Therefore, the bottle 100 can be suitably used for an application of filling a carbonated beverage, an application of a filling method in which air (particularly oxygen) is pushed out from a container by nitrogen generated by vaporization of dropped liquid nitrogen after filling the contents, thereby preventing oxidation of the contents, or the like.

More specifically, leg portions 5 are separated from each other by recess 6, and have a shape protruding downward of bottle 100 (fig. 2 and 3). The tip of leg 5 in the projecting direction serves as contact portion 51 that comes into contact when bottle 100 is set on a surface such as a desk. The depth from the mouth portion 1 of the bottle 100 is shallowest at the central portion 41 of the bottom portion 4, gradually increases along the leg portion 5, and is deepest inside the contact portion 51. In the present embodiment, 6 leg portions 5 are provided.

As shown in fig. 1 to 4, a recess 6 is provided between two adjacent legs 5. The number of the leg portions 5 is 6, and the number of the recess portions 6 is 6. The concave portion 6 extends radially from the center portion of the bottom portion 4 toward the outer side in the circumferential direction of the bottle 100. Further, in concave portion 6, rib 61 is provided to be recessed toward the inside of bottle 100.

The rib 61 is divided into two

parts

61a, 61b in the direction in which the recess 6 extends by a protrusion 62 protruding outward of the bottle 100. As shown in fig. 3, each of the

portions

61a and 61b of the two-divided rib 61 has a rounded rectangular shape when viewed from the lower side in the axial direction of the bottle 100.

Here, if an imaginary line connecting the most recessed portions of the concave portions 6 (ribs 61) with respect to the leg portions 5 is defined as the valley ribs 63, the height of the projecting portions 62 with respect to the valley ribs 63 is 2mm (fig. 4). The radii of curvature from the valley ribs 63 in each

part

61a, 61b of the bead 61 to the standing parts 64 of the protrusions 62 and the apex parts 65 of the protrusions 62 are both 2mm.

According to the above embodiment, the pressure resistance and impact resistance of bottle 100 can be improved at the same time.

Other embodiments

Next, another embodiment of the plastic bottle according to the present invention will be described. Further, unless a contradiction occurs, the structure disclosed in each embodiment below and the structure disclosed in the other embodiments may be combined and applied.

In the above-described embodiment, a configuration in which the ribs 61 are provided in all the recesses 6 has been described as an example. However, the bead according to the present invention may be provided in at least one of the plurality of recesses.

In the above-described embodiment, the structure in which the rib 61 is divided into two

portions

61a and 61b has been described as an example. However, the rib according to the present invention is not limited to such a configuration, and may be divided into three or more parts. Further, the reinforcing rib according to the present invention is preferably divided into two or three parts, and particularly preferably divided into two parts.

In the above-described embodiment, the case where the bead 61 is divided into two

portions

61a and 61b in the vicinity of the middle in the extending direction thereof has been described as an example. However, the present invention is not limited to the above-described structure, and the reinforcing rib according to the present invention may be divided into two parts at any position in the extending direction.

In the above-described embodiment, a configuration in which 6 leg portions 5 are provided has been described as an example. However, the present invention is not limited to such a configuration, and the number of legs is not limited to the number of legs according to the present invention. However, from the viewpoint of easy improvement of pressure resistance, it is preferable to provide 3 or more and 7 or less legs. More preferably, 5 or more and 7 or less legs are provided, and particularly preferably, 5 or more and 6 or less legs are provided.

In the above-described embodiment, the structure in which the two

portions

61a and 61b have a rounded rectangular shape when viewed from the lower side in the axial direction of the bottle 100 is described as an example. However, in the present invention, the shape of each part of the bead divided into a plurality of parts is not particularly limited, and may be, for example, a rectangular shape, an oval shape, or the like. However, a shape having no clear corner portions, such as a rounded rectangle shape or an oval shape, is preferable in terms of ease of improving the impact resistance of the bottle.

In the above-described embodiment, a configuration in which the height of the projection 62 based on the valley portion bead 63 of the bead 61 is 2mm was described as an example. Although the height of the projection is not particularly limited in the present invention, the height of the projection is preferably 0.5mm to 3mm from the viewpoint of easy bottle molding.

In the above-described embodiment, a configuration in which the radii of curvature of both the standing part 64 and the top part 65 are 2mm was explained as an example. In the present invention, the radii of curvature of the upright portions and the top portions of the protrusions are not particularly limited, but the radii of curvature are preferably 0.5mm or more and 5mm or less from the viewpoint of facilitating improvement of impact resistance.

All of the embodiments disclosed in the present specification are exemplary configurations, and it should be understood that the scope of the present invention is not limited to these configurations. It should be readily understood by those skilled in the art that appropriate changes may be made without departing from the spirit of the present invention. Therefore, it is needless to say that other embodiments which are modified within the scope not departing from the gist of the present invention are also included in the scope of the present invention.

Examples

The present invention will be further described below with reference to non-limiting examples.

Bottles of examples and comparative examples

Example (b): the bottles shown in FIGS. 1 to 4 were used.

Comparative example 1: a bottle having the same construction as in example 1 except that it has a bottom 4A as shown in fig. 5 was used.

Comparative example 2: a bottle having the same construction as in example 1 except that it has a bottom 4B as shown in fig. 6 was used.

The bottle according to the present invention is characterized in that the concave portion 6 has a rib 61 divided into two parts, as described in the embodiment. On the other hand, comparative example 1 is a bottle having no rib in the concave portion 6A. In comparative example 2, the concave portion 6B of the bottle was provided with the undivided rib 61B.

Withstand voltage test

450mL of 86 ℃ hot water was charged into each of the bottles of example, comparative example 1 and comparative example 2. The cap was screwed to the bottle filled with hot water, and the inside was set to a predetermined test pressure, and thereafter, the predetermined test time was maintained. Thereafter, for each bottle, the height of the center portion 41 from the horizontal plane when the bottle was left standing on the horizontal plane was measured. Then, with respect to the height of such a level, a decrease from the measurement value before the hot water is filled is calculated. The above tests were performed on examples, comparative examples 1 and 2 in 10 bottles, and the average value, the maximum value and the minimum value of the measured values were recorded.

Impact resistance test

The bottles of examples, comparative examples 1 and 2 were filled with water, and then the caps were tightened to give a total weight of 470g. Thereafter, each bottle was dropped from a height of 1m in a bottom-down posture. The bottles dropped were visually inspected for breakage. The above tests were carried out for each of examples, comparative examples 1 and 2 in 10 bottles.

As a result, the

Table 1 shows the results of the pressure resistance test and the impact resistance test for each bottle of example, comparative example 1, and comparative example 2. As shown in table 1, in the pressure resistance test, the amount of decrease in height from the horizontal plane of the center portion 41 after the test was smaller in the bottle of the example than in the bottles of comparative examples 1 and 2. That is, this indicates that the amount of deformation of the bottle of the example is relatively small. In the bottle of comparative example 1, the central portion 41 was deformed to a degree that it protruded beyond the contact portion 51, and therefore, the value of the amount of reduction in height from the horizontal plane of the central portion 41 after the test could not be determined. In addition, all the examples show sufficient impact resistance in the impact resistance test.

TABLE 1

Industrial applicability

The present invention is applicable to, for example, beverage products in which the internal pressure of the container is easily increased, such as applications for filling carbonated beverages and applications for filling liquid nitrogen together with the products.

Description of the symbols

100-plastic bottles (bottles);

1-an oral part;

2-shoulder part;

3-a main body portion;

4-bottom;

41-a central part;

5-a foot part;

51-a contact portion;

6-a recess;

61-reinforcing ribs;

62-a protrusion;

63-valley ribs;

64-a standing part;

65-top portion.

Claims

1. A plastic bottle having a petal-shaped bottom, characterized in that,

the bottom part has: a plurality of concave portions extending radially from a central portion of the bottom; and a plurality of legs separated from each other by the recess,

at least one of the recesses is provided with a rib that is recessed inward of the bottom,

the rib is divided into a plurality of portions in the extending direction of the concave portion.

2. The plastic bottle of claim 1, wherein all of said recesses are provided with said reinforcing ribs.

3. The plastic bottle of claim 1 or 2, wherein 5 or more and 7 or less of said feet are provided.

4. The plastic bottle according to any one of claims 1 to 3, wherein said reinforcing rib is divided into two parts in the extending direction of said recessed portion.

5. The plastic bottle according to any one of claims 1 to 4, wherein each of said reinforcing ribs divided into a plurality of sections has a rounded rectangular shape or an elliptical shape when viewed from an axially lower side of said plastic bottle.