JP7101545B2 - Plastic bottles and carbonated drink products using them - Google Patents

Description

The present invention relates to a plastic bottle and a carbonated beverage product in which the plastic bottle is filled with a carbonated beverage.

Conventionally, plastic bottles for beverages and the like have been developed in various shapes, and have various purposes depending on the type of beverage to be filled and the form of the beverage or the like product in which the plastic bottle is filled with the beverage or the like. The shape is designed.

In a plastic bottle for carbonated drinks, since the inside thereof is filled with high-pressure carbon dioxide gas, a load is generated due to a pressure difference between the inside and the outside, and the applied load can deform the plastic bottle. For the purpose of obtaining the proof stress against such a load, various measures have been taken for the shape of the plastic bottle (Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2015-166252 Japanese Unexamined Patent Publication No. 2008-56305

By the way, in a plastic bottle for carbonated beverages, it is common to configure the shoulder portion of the plastic bottle as a convex curved surface protruding to the outside of the plastic bottle (Patent Documents 1 and 2). With this configuration, the strength of the shoulder can be increased to prevent deformation due to the pressure difference between the inside and outside, and at the same time, the volume of the entire plastic bottle can be increased by increasing the volume of the shoulder. .. Further, in order to withstand an increase in internal pressure due to carbon dioxide gas, it is also common to form the bottom portion in a characteristic uneven shape (so-called petaloid shape) in which ground contact portions are scattered.

As described above, plastic bottles for carbonated drinks generally have a characteristic shape determined from the viewpoint of strength at the shoulder and the bottom. In addition, since the shoulders and the bottom inevitably have characteristic shapes, it is difficult to design the appearance in a manner that can differentiate it from other products.

Therefore, it is desired to realize a plastic bottle that can obtain a design effect that is differentiated from other plastic bottle products.

The plastic bottle according to the present invention is for carbonated beverages , which includes a shoulder portion having a slope portion and a recess, a mouth portion connected to the upper part of the shoulder part, and a body portion connected to the lower part of the shoulder portion. The slope portion of the plastic bottle is a conical surface continuously provided below the mouth portion, so that the angle between the conical surface and the axis of the plastic bottle is 30 to 46 °. The recess is a concave curved surface that is continuous below the slope, is configured to plunge into the inside of the plastic bottle, and the shoulder is configured to extend upward from the body. Plastic bottles.

Further, the present invention is a carbonated drink product in which a plastic bottle according to the present invention is filled with a carbonated drink, and in a state where the carbonated drink is filled, the main shoulder portion including the slope portion and the recess is the mouth. It is also a carbonated beverage product having a conical surface continuously provided below the portion and having an angle of 40 to 50 ° between the main shoulder portion and the axial center.

According to this configuration, the shoulder portion of the carbonated beverage product in which the plastic bottle according to the present invention is filled with the carbonated beverage is formed by a linear contour, so that the carbonated beverage product resembles a metal can. You can get the appearance and get the design effect that differentiates you from other plastic bottle products.

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

As one aspect of the plastic bottle according to the present invention, the shoulder portion further has a convex portion connected to the concave portion and the body portion, and the convex portion is a convex curved surface protruding to the outside of the plastic bottle. Therefore, it is preferable that the convex curved surface is configured so that the radius of curvature in the vertical direction is 5 mm or less.

According to this configuration, it is possible to give an impression that the connection portion between the shoulder portion and the body portion is angular in the appearance of the carbonated beverage product in which the plastic bottle according to the present invention is filled with the carbonated beverage, and the above-mentioned design effect can be obtained. It will increase further.

As one aspect of the plastic bottle according to the present invention, it is preferable that the difference between the minimum value of the diameter of the body portion and the maximum value of the diameter of the body portion is 1 mm or less.

According to this configuration, not only the shoulder portion but also the body portion of the carbonated beverage product in which the plastic bottle according to the present invention is filled with the carbonated beverage is configured with a linear contour, so that the above-mentioned design effect is further enhanced. ..

As one aspect, the plastic bottle according to the present invention preferably has a maximum filling pressure of 3.5 kgf / cm ² or more.

According to this configuration, the plastic bottle according to the present invention can be used for strongly carbonated drinks.

As one aspect, the plastic bottle according to the present invention preferably has a wall thickness of 0.3 mm or more and 0.8 mm or less.

According to this configuration, the strength of the wall portion of the plastic bottle can be set to a level that can cause the deformation necessary to bring about the above-mentioned design effect and does not cause the unnecessary deformation.

Further features and advantages of the invention will be further clarified by the following illustration of exemplary and non-limiting embodiments described with reference to the drawings.

Front view of plastic bottle Enlarged view of the front part of the plastic bottle (shoulder and torso) Front sectional view of a plastic bottle Front sectional view of carbonated drink products (plastic bottles filled with carbonated drinks)

An embodiment of the plastic bottle according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the plastic bottle (hereinafter, simply referred to as a bottle) 100 according to the present embodiment has a mouth portion 1 as a liquid spout and a mouth portion 1 continuous with the mouth portion 1 and gradually toward the bottom surface. It is composed of a shoulder portion 2 whose diameter is expanded, a cylindrical body portion 3 continuous with the shoulder portion 2, and a bottom portion 4 which is the bottom of the bottle 100. In the following description, "up and down" is defined as "upper" on the mouth 1 side of the bottle 100 and "lower" on the bottom 4 side.

The bottle 100 can be integrally molded by a stretch molding method such as biaxial stretch 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 can be about 200 mL to 2 L, such as 280 mL, 350 mL, and 500 mL that are generally distributed. The liquid to be filled in the bottle 100 is not particularly limited, and for example, drinks such as carbonated drinks, soft drinks, tea, fruit juice, coffee, cocoa, alcoholic drinks, milk drinks, soups, and liquids such as sauces and soy sauces. Seasonings, etc. can be mentioned.

[Basic configuration of bottle 100]
The bottle 100 is configured so that it can be filled with carbonated drinks. Specifically, each part of the bottle 100 is configured to have a wall thickness of 0.4 mm or more, and its maximum filling pressure is 4.5 kgf / cm ² . Further, each portion of the bottle 100 is configured so that the wall thickness is 0.7 mm or less, and this wall thickness is selected from the viewpoint of improving the molding processability of the bottle 100. In the present embodiment, the full filling capacity of the bottle 100 is 410 mL, and in this case, the above-mentioned wall thickness is realized by biaxially stretching blow molding a preform having a weight of 29 g to obtain the bottle 100. The bottom portion 4 has a complicated uneven shape (so-called petaloid shape) in which ground contact portions are scattered in order to withstand an increase in internal pressure due to carbon dioxide gas, and is formed thicker than other portions.

As shown in FIGS. 1 to 3, the shoulder portion 2 has a slope portion 21, a concave portion 22, and a convex portion 23 in this order from the top. The slope portion 21 is a conical surface continuously provided below the mouth portion 1, and is configured such that the angle α formed by the conical surface and the axial center X of the bottle 100 is 36 °. The concave portion 22 is a concave curved surface having a radius of curvature R1 continuously provided below the slope portion 21 and has a radius of curvature _R1 of 20 mm, and is configured to plunge into the inside of the bottle 100. Further, the convex portion 23 is a convex curved surface having a radius of curvature _R2 of 3 mm, which is continuously provided below the concave portion 22 and above the body portion 3, and is configured to project to the outside of the bottle 100.

The body portion 3 has the maximum diameter at the torso upper end portion 3a connected to the shoulder portion 2 and the torso lower end portion 3c connected to the bottom portion 4, and the diameter at the portion is 68.0 mm. On the other hand, the body center portion 3b, which is the central portion in the vertical direction of the body portion 3, has a smaller diameter than the body upper end portion 3a and the body lower end portion 3c, and the diameter of the body portion 3 is the minimum value in the body center portion 3b. It becomes 67.5 mm. That is, the body portion 3 is configured such that the difference between the minimum value and the maximum value of the diameter is 0.5 mm.

When the slope portion 21 and the recess 22 are configured as described above, the shoulder main portion 24 of the shoulder portion 2 composed of the slope portion 21 and the recess 22 directly connects the lower end of the mouth portion 1 and the lower end of the shoulder portion 2. It will have a recessed shape inside the bottle 100 rather than the conical surface A. Further, the body center portion 3b has a shape recessed inside the bottle 100 rather than the cylindrical surface B directly connecting the body upper end portion 3a and the body lower end portion 3c.

[Carbonated drink product 200 using bottle 100]
Next, a carbonated beverage product in which a plastic bottle according to the present invention is filled with a carbonated beverage will be described. In the present embodiment, a carbonated beverage product 200 in which a bottle 100 is filled with a carbonated beverage under the conditions of a filling pressure of 4.3 kgf / cm ² and a filling capacity of 385 mL will be described as an example.

When the bottle 100 is filled with a carbonated drink under the above conditions and sealed with a cap 5 (FIG. 4), the pressure inside the bottle 100 becomes higher than the atmospheric pressure due to the filling pressure. Therefore, a pressure difference is generated inside and outside the bottle 100, and the pressure difference acts as a load that pushes the bottle 100 from the inside to the outside of the bottle. Here, the convex portion 23 configured as a convex curved surface protruding outward of the bottle 100 and the bottom portion 4 formed thicker than the other portions are not easily deformed by the applied load. On the other hand, since the shoulder main portion 24 (slope portion 21, recess 22) and the body center portion 3b of the shoulder portion 2 are recessed inside the bottle 100 as described above, they are easily pushed outward by the applied load. Therefore, when the bottle 100 is filled with a carbonated drink, these portions are selectively deformed.

As a result of the deformation of the bottle 100 filled with the carbonated drink as described above, in the carbonated drink product 200, as shown in FIG. 4, the shape of the shoulder main portion 24 of the shoulder portion 2 substantially matches the conical surface A. , The shape of the central portion 3b of the body substantially matches the cylindrical surface B. At this time, the angle β formed by the conical surface A and the axis X is 46 °. Due to this shape, the appearance of the carbonated beverage product 200 is configured with a linear contour as shown in FIG. By having such a linear contour, the carbonated beverage product 200 can obtain an appearance similar to that of a metal can, and can obtain a design effect different from other plastic bottle products.

[Other embodiments]
Finally, other embodiments of the plastic bottle according to the present invention will be described. The configurations disclosed in each of the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction.

In the above embodiment, the configuration in which the angle α formed by the conical surface forming the slope portion 21 and the axis X of the bottle 100 is 36 ° has been described as an example. However, without being limited to such a configuration, the angle formed by the conical surface forming the slope portion and the axis of the plastic bottle may be 30 to 46 °. However, since it is easy to obtain a linear contour after filling the carbonated drink, the angle is preferably 33 to 40 °, more preferably 34 to 38 °.

In the above embodiment, the configuration in which the radius of curvature _R2 of the convex curved surface forming the convex portion 23 is 3 mm has been described as an example. However, without being limited to such a configuration, the radius of curvature of the convex curved surface forming the convex portion may be 5 mm or less. However, since a linear contour can be easily obtained after filling the carbonated drink, the radius of curvature is preferably 4 mm or less, and more preferably 3 mm or less.

In the above embodiment, the configuration in which the maximum filling pressure of the bottle 100 is 4.5 kgf / cm ² has been described as an example. However, without being limited to such a configuration, the maximum filling pressure of the plastic bottle according to the present invention may be 3.5 kgf / cm ² or more.

In the above embodiment, the configuration in which the wall thickness of the bottle 100 is 0.4 mm or more and 0.7 mm or less has been described as an example. However, without being limited to such a configuration, the wall thickness of the plastic bottle according to the present invention may be 0.3 mm or more and 0.8 mm or less. However, since the value of the maximum filling pressure can be increased, the wall thickness of the plastic bottle is preferably 0.4 mm or more. Further, the wall thickness of the plastic bottle is preferably 0.7 mm or less because the moldability of the plastic bottle can be improved.

In the above embodiment, a configuration obtained by biaxially stretching blow molding a preform having a weight of 29 g has been described for a bottle 100 having a full injection capacity of 410 mL. However, without being limited to such a configuration, the full filling capacity of the plastic bottle according to the present invention may be 200 to 2000 mL, and the weight of the preform used for producing the plastic bottle according to the present invention is 24 to 48 g. May be.

In the above embodiment, the carbonated beverage product 200 in which the angle β formed by the conical surface A and the axis X is 46 ° has been described as an example. However, without being limited to such a configuration, the angle formed by the conical surface and the axis may be 40 to 50 °.

In the above embodiment, the carbonated drink product 200 in which the bottle 100 is filled with the carbonated drink under the conditions of a filling pressure of 4.3 kgf / cm ² and a filling capacity of 385 mL has been described as an example. However, without being limited to such a configuration, in the carbonated beverage product according to the present invention, the filling pressure of the carbonated beverage may be 3.5 kgf / cm ² or more, and the filling capacity may be 200 to 2000 mL. ..

It should be understood that with respect to other configurations, the embodiments disclosed herein are exemplary in all respects and the scope of the invention is not limited thereto. Those skilled in the art will be able to easily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Therefore, another embodiment modified without departing from the spirit of the present invention is naturally included in the scope of the present invention.

The present invention can be used, for example, as a plastic bottle for carbonated beverage products, and can obtain a design effect different from other plastic bottle products.

100: Plastic bottle 200: Carbonated beverage product 1: Mouth part 2: Shoulder part 21: Slope part 22: Recessed part 23: Conical part 24: Shoulder main part 3: Body part 3a: Body upper part 3b: Body center part 3c: Body Lower end 4: Bottom 5: Cap X: Axis center of plastic bottle 100 A: Conical surface directly connecting the lower end of the mouth 1 and the lower end of the shoulder 2 B: The upper end of the body 3a and the lower end of the body 3c Directly connected cylindrical surface α: Angle formed by the conical surface forming the slope portion 21 and the axial center X β: Angle formed by the conical surface A and the axial center X R ₁ : Radius of curvature of the concave portion 22 R ₂ : Convex portion 23 Radical radius of

Claims (6)

A plastic bottle for carbonated drinks , comprising a shoulder portion having a slope portion and a recess, a mouth portion continuously provided above the shoulder portion, and a body portion continuously provided below the shoulder portion.
The slope portion is a conical surface continuously provided below the mouth portion, and is configured such that the angle between the conical surface and the axis of the plastic bottle is 30 to 46 °.
The recess is a concave curved surface that is continuously provided below the slope portion, and is configured to plunge into the inside of the plastic bottle, and the shoulder portion is configured to extend upward from the body portion . Bottle. The shoulder portion further has a convex portion connected to the concave portion and the body portion.
The plastic bottle according to claim 1, wherein the convex portion is a convex curved surface protruding to the outside of the plastic bottle, and the radius of curvature in the vertical direction of the convex curved surface is 5 mm or less. The plastic bottle according to claim 1 or 2, wherein the difference between the minimum value and the maximum value of the diameter of the body portion is 1 mm or less. The plastic bottle according to any one of claims 1 to 3, wherein the maximum filling pressure is 3.5 kgf / cm2 or more. The plastic bottle according to any one of claims 1 to 4, wherein the wall thickness is 0.3 mm or more and 0.8 mm or less. A carbonated beverage product in which a plastic bottle according to any one of claims 1 to 5 is filled with a carbonated beverage.
In the state of being filled with the carbonated drink, the main shoulder portion including the slope portion and the concave portion forms a conical surface continuously provided below the mouth portion, and the angle formed by the main shoulder portion and the axial center. A carbonated beverage product with a temperature of 40 to 50 °.

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