CN111032521A

CN111032521A - Plastic bottle

Info

Publication number: CN111032521A
Application number: CN201880055644.7A
Authority: CN
Inventors: 伊藤真也; 清水雄三
Original assignee: Suntory Holdings Ltd
Current assignee: Suntory Holdings Ltd
Priority date: 2017-08-28
Filing date: 2018-06-06
Publication date: 2020-04-17
Also published as: EP3677522A1; JP7388807B2; AU2018324628A1; JP2019038595A; EP3677522A4; WO2019044099A1

Abstract

The pressure-increasing absorption effect of the shoulder is improved. The plastic bottle is provided with: the plastic bottle (1) comprises a mouth part (2), a shoulder part (3) gradually expanding in diameter from the mouth part (2) to the bottom surface direction, and a main body part (4) continuous with the shoulder part (3), wherein at least one plate (31) sinking towards the inner side is arranged on the shoulder part (3), the bottom surface (31a) of the plate (31) is formed into a curved surface protruding towards the inner side, and the depth (D) from a plane (P) passing through the upper end (31c) and the lower end (31c) of the plate (31) to the deepest part of the bottom surface (31a) of the plate (31) is 1-7 mm.

Description

Plastic bottle

Technical Field

The present invention relates to a plastic bottle having a mouth portion, a shoulder portion whose diameter gradually increases from the mouth portion toward a bottom surface, and a body portion continuous with the shoulder portion.

Background

In recent years, as plastic bottles for filling beverages, not only plastic bottles that are displayed in a cooled state or at room temperature, but also plastic bottles for heating that are displayed in a heated state have been used. In addition, in some cases, a heating plastic bottle is used by being filled with a beverage at normal temperature and heated at the time of display, and in this case, the internal pressure of the bottle rises more than that at the time of filling due to a temperature change caused by heating at the time of display.

In contrast, japanese patent application laid-open No. 2016-132500 (patent document 1) discloses a bottle in which pressure absorbing plates are provided on a shoulder portion and a main body portion, and according to this bottle, an increase in internal pressure caused by heating after filling can be absorbed by the plates of the shoulder portion and the main body portion.

Documents of the prior art

Patent document

Patent document 1 Japanese patent laid-open No. 2016-132500

However, in the bottle of patent document 1, it is necessary to provide a plate on the entire body of the main body, which is disadvantageous when the design of the main body is changed, for example, by providing decoration to the main body. Therefore, if the design of the main body is changed, the internal pressure of the bottle needs to be absorbed in a portion other than the main body.

Therefore, a plastic bottle that improves the pressure-absorbing effect of the shoulder portion is desired.

Disclosure of Invention

The plastic bottle of the present invention comprises:

a mouth portion, a shoulder portion whose diameter is gradually increased from the mouth portion toward a bottom surface, and a body portion continuous to the shoulder portion,

at least one inwardly recessed plate is provided on the shoulder,

the bottom surface of the plate is formed as a curved surface convex toward the inside,

the depth from a plane passing through the upper and lower ends of the plate to the deepest portion of the bottom surface of the plate is 1mm to 7 mm.

According to this configuration, by providing the plate having the curved surface projecting inward, the plate can be moved outward greatly when the interior of the bottle is pressurized, and the effect of absorbing the pressurizing force at the shoulder portion can be effectively improved. In addition, the pressure-increasing absorption effect of the shoulder can be effectively improved by setting the depth to 1mm to 7 mm. That is, if the depth is less than 1mm, the amount of absorption of the boost is insufficient, and if the depth exceeds 7mm, the plate is difficult to move and the absorption of the boost becomes difficult.

Hereinafter, preferred embodiments of the plastic bottle of the present invention will be described. However, the scope of the present invention is not limited to the preferred embodiments described below.

In one embodiment, a pillar portion is preferably provided between the side edges of the adjacent plates.

According to this configuration, the pillar portion is provided, so that the movement of the adjacent plates does not affect the plates.

In one embodiment, it is preferable that three or more plates are provided in the shoulder portion.

According to this structure, since three or more plates are provided, the plates are not excessively large, and the plates are easily moved during supercharging.

In one aspect, a boundary between the pillar portion and the plate is preferably formed in an arc shape. Preferably, the plate is connected to the body, and a boundary between the body and the plate is connected in an arc shape.

According to this configuration, since the boundaries between the pillar portions and the plate or the boundaries between the body portion and the plate are arc-shaped, the plate is more likely to move outward during supercharging than when the boundaries are angular.

As one way, it is preferable that the plate is formed in a triangular or trapezoidal shape.

According to this structure, the plate can be set to a large size on the shoulder by making the plate triangular or trapezoidal. Further, the plate is easier to move and the plate area is also set wider than a rectangular plate.

In one aspect, the peripheral surface of the main body is preferably formed as a smooth surface having no irregularities.

According to the plastic bottle of the present invention, since the shoulder portion can effectively absorb the increased pressure, the body portion can be made to be a smooth surface without a plate, and the appearance effect can be improved.

In one embodiment, the plastic bottle is preferably a heating plastic bottle.

According to the plastic bottle of the present invention, since the shoulder portion can effectively absorb the increased pressure, even if the plastic bottle is used as a heating plastic bottle as in this configuration, the disadvantage of the increased pressure inside the bottle can be effectively avoided.

Drawings

Fig. 1 is a front view of a plastic bottle.

Fig. 2 is a top view of a plastic bottle.

Fig. 3 is a sectional view III-III of fig. 1.

Fig. 4 is a sectional view IV-IV of fig. 2.

Detailed Description

An embodiment of the plastic bottle of the present invention will be described with reference to the drawings. As shown in fig. 1, a plastic bottle 1 of the present embodiment includes a mouth portion 2 serving as a liquid inlet, a shoulder portion 3 continuous with the mouth portion 2 and gradually expanding in diameter as it goes toward a bottom surface, a cylindrical body portion 4 continuous with the shoulder portion 3, and a bottom portion 5 serving as a bottom of the plastic bottle 1. The plastic bottle 1 of the present embodiment is for heating, and is characterized by a plate 31 provided on the shoulder portion 3. Next, the structure of the shoulder portion 3 will be described in detail.

In the present embodiment, as shown in fig. 1 to 4, four inwardly recessed plates 31 are provided at equal intervals in the shoulder portion 3 and have the same shape. As shown in fig. 3, the bottom surface 31a of each plate 31 is formed as a curved surface that protrudes toward the inside of the bottle. By forming the curved surface protruding toward the inside of the bottle in this manner, the plate 31 can be moved outward greatly when the inside of the bottle is pressurized. In addition, the plate 31 extends perpendicularly with respect to the circumferential direction.

The depth D (see FIG. 4) from the plane P passing through the upper and

lower ends

31c, 31c of the plate to the deepest portion of the bottom surface 31a of the plate 31 is 1mm to 7 mm. This is because if the depth D is less than 1mm, the amount of the supercharged absorption is insufficient, and if the depth D exceeds 7mm, the plate is hard to move and the supercharged absorption becomes difficult. The depth D is more preferably 2mm to 6mm, and still more preferably 3mm to 5 mm.

In the present embodiment, the pillar portion 32 is provided between the side edges 31b of the adjacent plates 31. By providing the pillar portion 32, the operation of the adjacent plates 31 does not affect the plates. Further, the boundary between the pillar portion 32 and the plate 31 is formed in an arc shape, and the plate 31 is more likely to move outward during supercharging than in the case where the boundary between the pillar portion 32 and the plate 31 is angular. Further, the plate 31 is connected to the body 4, and the boundary between the body 4 and the plate 31 is formed in an arc shape. This makes it easier for the plate 31 to move outward during supercharging, as compared with the case where the boundary between the body 4 and the plate 31 is angular.

In the present embodiment, the plate 31 is formed in a trapezoidal shape. This allows the plate 31 to be provided in a large area on the shoulder 3, thereby improving the pressure-absorbing effect of the shoulder 3. Further, the plate is more likely to move outward during supercharging than a rectangular plate, and the plate area is also large.

The plastic bottle 1 having the above-described structure can improve the pressure increase absorption effect by the shoulder portion 3, and can absorb the pressure increase in the interior of the bottle during heating without providing the body portion 4 with a structure having a pressure increase absorption function. Therefore, in the present embodiment, since the shoulder portion 3 absorbs the increased pressure, the body portion 4 can be configured to have a feature that the circumferential surface is formed of a smooth surface having no irregularities, and the effect of appearance can be improved.

Next, an example of the pressure boost absorbing effect of the shoulder portion 3 will be described. A 500ml bottle having the same shape as the plastic bottle 1 of the present embodiment was compared in terms of changes in bottle shape after being boiled with hot water at 75 ℃ for a predetermined time in a state filled with a beverage. Specifically, the bottle (1) was not provided with the plate itself at the shoulder, (2) was provided with four plates at the shoulder, but the bottom surface of the plate was a flat surface, (3) was provided with four plates whose bottom surfaces were formed into curved surfaces protruding toward the inside of the bottle at the shoulder, and the depth of the deepest part of the plate was 3mm, (4) was provided with the depth of the deepest part of the plate in the bottle of (3), and (5) was provided with the depth of the deepest part of the plate in the bottle of (3), these bottles (1) to (5) are compared with each other only in the structure of the shoulder, in the bottles (1) and (2), the bottom of the bottle is deformed by boiling water and is in a state of not standing by oneself or inclining even standing by oneself, however, the bottles (3) to (5) are not in the bottle states (1) and (2), but are maintained in a state in which they can normally stand by themselves. In this way, it is found that the shoulder pressure absorbing effect is improved by providing the shoulder portion with a plate having a bottom surface formed as a curved surface protruding toward the inside of the bottle.

The plastic bottle 1 of the present embodiment can be integrally molded by a stretch molding method such as biaxial stretch blow molding, using, for example, a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material. The capacity of the plastic bottle 1 is not particularly limited, and may be about 200 ml to 2 l such as 280ml, 350ml, 500ml, and the like which are generally distributed. The liquid filled in the plastic bottle 1 is not particularly limited, and examples thereof include drinking water, tea, fruit juice, coffee, cocoa, soft drink water, alcoholic beverages, milk beverages, soup and other beverages, and liquid seasonings such as sauces and soy sauces.

[ other embodiments ]

Finally, another embodiment of the plastic bottle of the present invention will be described. The structures disclosed in the following embodiments may be combined with the structures disclosed in other embodiments as long as no contradiction occurs.

(1) In the above embodiment, the configuration in which the four plates 31 are provided in the shoulder portion 3 has been described as an example. However, the embodiment of the present invention is not limited to this, and at least one plate 31 may be provided, and more preferably, three or more plates may be provided.

(2) In the above embodiment, the description has been given taking as an example a configuration in which the plate 31 is formed in a trapezoidal shape. However, the embodiment of the present invention is not limited to this, and the plate 31 may be triangular, or may be modified as appropriate.

(3) In the above embodiment, a structure in which no decoration is applied to the plate 31 is exemplified. However, the embodiment of the present invention is not limited to this, and predetermined characters, figures, and other decorations may be provided on the plate 31.

(4) In the above embodiment, the description has been given taking as an example a configuration in which the boundary between the pillar portion 32 and the plate 31 or the boundary between the body portion 4 and the plate 31 is formed in an arc shape. However, the embodiment of the present invention is not limited to this, and the boundary between the pillar portion 32 and the plate 31 and the boundary between the body portion 4 and the plate 31 may be formed to have an angular shape, or the body portion 4 and the plate 31 may not be connected.

(5) In the above embodiment, the configuration in which the circumferential surface 4a of the main body 4 is a smooth surface has been described as an example. However, the embodiment of the present invention is not limited to this, and the main body 4 may be provided with a plate, a rib, or the like, or may be provided with a predetermined decoration such as a character or a figure.

(6) In the above embodiment, the description has been given taking as an example a configuration in which the depth D from the plane P passing through the upper and

lower ends

31c, 31c of the plate 31 to the deepest portion of the bottom surface 31a of the plate 31 is 1mm to 7 mm. However, as a reference example, it is also conceivable to set the depth of the plate from the plane passing through the left and right side edges 31b, 31b of the plate 31 to the deepest portion of the bottom surface 31a of the plate 31 to 1mm to 7 mm.

(7) The embodiments disclosed in the present specification are illustrative in all respects with respect to other configurations, and the scope of the present invention is not limited to these embodiments. Those skilled in the art can easily understand that appropriate changes can be made without departing from the spirit of the present invention. Therefore, it is needless to say that other embodiments modified within the scope not departing from the gist of the present invention are also included in the scope of the present invention.

Industrial applicability

The present invention can be used for a heating plastic bottle, for example.

Description of the symbols

1 Plastic bottle

2 mouth part

Shoulder 3

3a position of the peripheral surface

31 plate

31a bottom surface

31b side edge

31c upper and lower ends

32 post part

4 main body part

4a peripheral surface

Depth of D

P passes through the plane of the upper and lower ends of the plate

Claims

1. A plastic bottle, comprising: a mouth portion, a shoulder portion whose diameter is gradually increased from the mouth portion toward a bottom surface, and a body portion continuous to the shoulder portion,

at least one inwardly recessed plate is provided on the shoulder,

2. Plastic bottle according to claim 1,

a post is disposed between the sides of adjacent plates.

3. Plastic bottle according to claim 1 or 2,

three or more plates are provided on the shoulder.

4. Plastic bottle according to any of claims 1 to 3,

the junction of the pillar portion and the plate is formed in an arc shape.

5. Plastic bottle according to any one of claims 1 to 4,

the plate is connected with the main body part, and the junction of the main body part and the plate is in an arc shape.

6. Plastic bottle according to any one of claims 1 to 5,

the plate is formed in a triangular or trapezoidal shape.

7. Plastic bottle according to any one of claims 1 to 6,

the peripheral surface of the main body is formed as a smooth surface without irregularities.

8. Plastic bottle according to any one of claims 1 to 7,

the plastic bottle is a heating plastic bottle.