CN115768691A

CN115768691A - Plastic bottle

Info

Publication number: CN115768691A
Application number: CN202180044532.3A
Authority: CN
Inventors: 清水雄三; 松竹直斗; 萨耶尔斯·阿利斯泰尔
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: WO2021261292A1; JP7370301B2; JP2022001502A

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), wherein at least one of the recesses (6) is provided with a first rib (61) and a second rib (62) that are recessed inward of the bottom (4), the first rib (61) extends along the direction of extension of the recess (6), and the second rib (62) is continuous with the first rib (61).

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 product to be filled, the filling method, and other conditions, 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 literature

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 using 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 in a radial shape from a central portion of the bottom portion; and a plurality of legs separated from each other by the recesses, wherein at least one of the recesses includes a first rib and a second rib that are retracted inward of the bottom portion, the first rib extends along an extending direction of the recess, and the second rib is continuous with the first rib.

With this structure, the pressure resistance can be further improved and the impact resistance can be increased.

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 concave portions include the first bead and the second bead.

With this structure, the effect of improving the pressure resistance and the impact resistance is more remarkable.

In one aspect of the plastic bottle according to the present invention, it is preferable that the second bead extends from the first bead to the leg portion.

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

In one aspect of the plastic bottle according to the present invention, it is preferable that the concave portions each include a plurality of the second ribs.

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

In one aspect of the plastic bottle according to the present invention, it is preferable that the second bead extends along an extending direction of the concave portion in a state of being further recessed from the first bead toward an inner side of the bottom portion.

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

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.

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 bottom view of a plastic bottle according to a first embodiment of the present invention.

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

Fig. 4 is a perspective view of the bottom of the plastic bottle of comparative example 1.

Fig. 5 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 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 direction toward a bottom surface, 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 1 side of the bottle 100 is defined as "up" and the bottom 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 beverages, cocoa beverages, and the like), beverages such as alcoholic beverages and dairy drinks, liquid foods such as soups, liquid seasonings such as sauces and sauces, and the like. 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 3, 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 carbonated beverages, 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 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 1 of the bottle 100 is shallowest at the central portion 41 of the bottom 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 3, 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 portions 6 extend radially from the central portion of the bottom portion 4 toward the outer side in the circumferential direction of the bottle 100. The recessed portion 6 is provided with ribs (first ribs and second ribs) described later. Hereinafter, two embodiments of the reinforcing rib will be described. The same components in the two embodiments are denoted by the same reference numerals.

First embodiment of the reinforcing Ribs

In the recess 6 (fig. 2) according to the first embodiment, a first bead 61 is provided that extends in the extending direction of the recess 6 and recedes inward of the bottom portion 4. Further, the second beads 62 are provided so as to extend from the first beads 61 to the leg portion 5. As shown in fig. 2, 6 second beads 62 extend from each first bead 61 to the leg portions 5 on both sides. More specifically, 1 (2 in total) of these 6 second beads 62 extend from the three root end portions 62a spaced apart in the extending direction of the first bead 61 to the leg portions 5 on both sides. The extending direction of the first rib 61 is orthogonal to the extending direction of each second rib.

Second embodiment of the reinforcing Bar

The recess 6 (fig. 3) according to the second embodiment is provided with: a first rib 63 extending along the extending direction of the recess 6 and retracting inward of the bottom 4; and a second rib 64 which is further recessed from the first rib 63 toward the inside of the bottom portion 4. Here, the second beads 64 also extend in the extending direction of the recessed portion 6, as in the first beads 63. The second bead 64 extends over substantially the entire length of the extension of the first bead 63. With the above configuration, the first reinforcing bead 63 and the second reinforcing bead 64 form a two-ply indented configuration.

In any of the first and second embodiments described above, the first bead and the second bead are formed as a continuous and integral bead. According to these embodiments, 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 of the following embodiments and the structure disclosed in the other embodiments may be combined and applied.

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

In the first embodiment described above, a configuration in which 6 second beads 62 are provided is explained as an example. However, the second beads according to the present invention are not limited to such a configuration, and when the second beads are provided so as to extend from the first beads to the leg portion, the number thereof may be one or more. For example, the number of the second ribs may be 1 or more and 8 or less for one first rib. The depth of the second rib is preferably 0.1mm or more and 1.0mm or less, and the thickness of the second rib is preferably 0.1mm or more and 2.0mm or less. Here, the depth of the second bead refers to a depth of the second bead that is recessed inward of the bottom portion 4. The thickness of the second rib means a dimension of the second rib in a direction intersecting with the extending direction and the retracting direction of the second rib.

In the first embodiment described above, a configuration in which 1 (2 in total) second beads 62 extend from each end portion 62a to each leg portion 5 on both sides has been described as an example. That is, in this embodiment, the 2 second beads 62 have one root end portion 62a in common. However, the present invention is not limited to such a configuration, and when the second bead according to the present invention is provided so as to extend from the first bead to the leg portion, each of the second beads may have a separate root end portion. In addition, conversely, more than 3 second reinforcing beads may have a root end portion in common.

In the first embodiment described above, a configuration in which the extending direction of the first beads 61 is orthogonal to the extending direction of each second bead has been described as an example. However, when the second beads according to the present invention are provided so as to extend from the root end portions provided continuously to the first beads to the leg portions, the angle at which the extending direction of the first bead 61 intersects with the extending direction of each second bead is not particularly limited.

In the second embodiment described above, a configuration in which the second bead 64 extends over substantially the entire span of the extension length of the first bead 63 has been described as an example. However, the second bead is not limited to such a configuration, and when the second bead according to the present invention is provided so as to be further recessed from the first bead toward the inside of the bottom portion, the extension length of the second bead may be smaller than the extension length of the first bead. In this case, a plurality of second beads may be provided in the extending direction of the first beads.

In the above-described embodiment, the configuration in which 6 leg portions 5 are provided is explained 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 5 or more and 7 or less leg portions, and it is particularly preferable to provide 5 or more and 6 or less leg portions.

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 will be readily understood by those skilled in the art that appropriate changes may be made without departing from the spirit of the 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 1: a bottle having the reinforcing bead of the first embodiment (fig. 2) was used.

Example 2: a bottle having the reinforcing bead of the second embodiment (fig. 3) was 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. 4 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. 5 was used.

Example 1 is a bottle according to a first embodiment of the present invention, and as described in the section of the embodiment, the bottle includes: the first reinforcing ribs 61; and a second rib 62 extending from the first rib 61 toward the leg portion 5. Example 2 is a bottle according to a second embodiment of the present invention, and as described in the section of the embodiment, the bottle includes: the first reinforcing ribs 63; and a second rib 64 which is further recessed from the first rib 63 toward the inside of the bottom portion 4. Comparative example 1 is a bottle having no rib in the concave portion 6A. Comparative example 2 is a bottle having a rib 61B which is not divided in the concave portion 6B.

Withstand voltage test

450mL of 86 ℃ hot water was charged into each of the bottles of examples and comparative examples. The cap was screwed to the bottle filled with hot water to set the inside to a predetermined test pressure, and then the bottle was held for a predetermined test time. 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 carried out for 10 bottles for each of examples and comparative examples, and the average value, the maximum value, and the minimum value of the measured values were recorded.

Impact resistance test

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

Results

Table 1 shows the results of the pressure resistance test and the impact resistance test for each of the bottles of examples and comparative examples. 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 bottle of the comparative example. 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 examples show sufficient impact resistance in the impact resistance test.

TABLE 1

Industrial applicability

The present invention can be used for beverage products in which the internal pressure of the container is easily increased, for example, for use in filling carbonated beverages or for use in filling liquid nitrogen together with products.

Description of the symbols

100-plastic bottles (bottles);

1-mouth part;

2-shoulder part;

3-a main body portion;

4-bottom;

41-a central portion;

5-foot part;

51-a contact portion;

6-a recess;

61-first reinforcing beads (first embodiment);

62-second reinforcing beads (first embodiment);

62 a-root end portion of second bead (first embodiment);

63-first reinforcing beads (second embodiment);

64-second stiffener (second embodiment).

Claims

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

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

at least one of the concave parts is provided with a first reinforcing rib and a second reinforcing rib which are retracted towards the inner side of the bottom part,

the first reinforcing bead extends along an extension direction of the recess,

the second reinforcing rib is continuous with the first reinforcing rib.

2. The plastic bottle of claim 1, wherein all of said recesses are provided with said first rib and said second rib.

3. The plastic bottle of claim 1 or 2, wherein said second reinforcing rib extends from said first reinforcing rib toward said foot portion.

4. The plastic bottle of claim 3, wherein said concave portions are provided with a plurality of said second ribs, respectively.

5. The plastic bottle according to claim 1 or 2, wherein said second rib extends in the extending direction of said recess in a state where said second rib is further retracted from said first rib toward the inside of said bottom portion.

6. The plastic bottle according to any one of claims 1 to 5, wherein 5 or more and 7 or less of said leg portions are provided.