JP2019218133A - Plastic bottle and carbonated beverage product using the same - Google Patents

Abstract

To realize a plastic bottle capable of having a design effect differentiated from other plastic bottle products.SOLUTION: A plastic bottle (100) comprises a shoulder portion (2) having a slope portion (21) and a concave portion (22), a mouth portion (1) provided continuously above the shoulder portion (2), and a body(3) provided continuously below the shoulder portion (2), in which the slope portion (21) has a conical surface continuously provided below the mouth portion (1), an angle between the conical surface and an axial center (X) of the plastic bottle (100) is configured to be 30 to 46°, and the concave portion (22) made up of a concave curved surface which is configured to protrude inside the plastic body (100) and continuously provided below the slope portion (21).SELECTED DRAWING: Figure 1

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.

  BACKGROUND ART Conventionally, various shapes of plastic bottles for beverages and the like have been developed, and according to the type of beverage to be filled or the form of a product such as a beverage in which the plastic bottle is filled with a beverage or the like, various purposes are provided. The shape with is designed.

  In a plastic bottle for carbonated beverages, since a high pressure carbon dioxide gas is filled in the inside, a load is generated due to a pressure difference between inside and outside, and the load can deform the plastic bottle. Various devices have been devised for the shape of the plastic bottle for the purpose of obtaining a proof stress against such a load (Patent Documents 1 and 2).

JP 2015-166252 A JP 2008-56305 A

  By the way, in plastic bottles for carbonated beverages, it is common to configure the shoulder of the plastic bottle as a convex curved surface protruding outside the plastic bottle (Patent Documents 1 and 2). With this configuration, it is possible to increase the strength of the shoulder portion so that the deformation due to the pressure difference between the inside and the outside is less likely to occur, and at the same time, the volume of the entire plastic bottle can be increased by increasing the volume of the shoulder portion. . In addition, 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 portions are scattered.

  As described above, a plastic bottle for carbonated beverages generally has a characteristic shape determined on the viewpoint of strength on a shoulder portion and a bottom portion. Since the shoulder and the bottom have inevitably characteristic shapes, it is difficult to design the appearance of the shoulder and the bottom in a manner that can be differentiated from other products.

  Therefore, realization of a plastic bottle capable of obtaining a design effect differentiated from other plastic bottle products is desired.

  A plastic bottle according to the present invention is a plastic bottle comprising a shoulder having a slope portion and a concave portion, 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 provided continuously below the mouth portion, and an angle formed between the conical surface and the axis of the plastic bottle is 30 to 46 °, and The concave portion is a concave curved surface continuously provided below the slope portion, and is configured to protrude into the inside of the plastic bottle.

  Further, the present invention is a carbonated beverage product in which the plastic bottle according to the present invention is filled with a carbonated beverage, and in a state where the carbonated beverage is filled, a shoulder main portion including the slope portion and the concave portion has the mouth. A carbonated beverage product having a conical surface continuously formed below the portion and having an angle between the shoulder main portion and the axis of 40 to 50 °.

  According to this configuration, since 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 configured with a linear contour, the carbonated beverage product resembles a metal can. The appearance can be obtained and the design effect differentiated from other plastic bottle products can be obtained.

  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.

  In one aspect of the plastic bottle according to the present invention, the shoulder portion further includes a convex portion connected to the concave portion and the body portion, and the convex portion has a convex curved surface protruding outside the plastic bottle. In addition, it is preferable that the convex curved surface be configured such that a vertical radius of curvature is 5 mm or less.

  According to this configuration, the appearance of the carbonated beverage product in which the plastic bottle according to the present invention is filled with the carbonated beverage can be given an angular impression at the connection between the shoulder and the body, and the above-described design effect can be obtained. Even higher.

  In one aspect of the plastic bottle according to the present invention, the difference between the minimum value of the diameter of the body and the maximum value of the diameter of the body is preferably 1 mm or less.

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

In one embodiment, 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 a strongly carbonated beverage.

  In one aspect, the plastic bottle according to the present invention preferably has a 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 at which the deformation required for providing the above-described design effect can be caused and unnecessary deformation is not caused.

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

Front view of plastic bottle Front view of plastic bottle (shoulder and torso) Front sectional view of plastic bottle Front sectional view of carbonated beverage product (plastic bottle filled with carbonated beverage)

  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 (hereinafter, simply referred to as a bottle) 100 according to the present embodiment has a mouth 1 serving as a liquid pouring port, and is gradually connected to the mouth 1 toward the bottom surface. The bottle 2 includes a shoulder portion 2 having an enlarged diameter, 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 formed by using a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material and by a stretching method such as biaxial stretching blow molding. The capacity of the bottle 100 is not particularly limited, and may be about 200 mL to 2 L, such as 280 mL, 350 mL, and 500 mL which are generally distributed. The liquid to be filled in the bottle 100 is not particularly limited. For example, beverages such as carbonated beverages, soft drinks, tea, fruit juice, coffee, cocoa, alcoholic beverages, milk beverages, soups, and liquids such as sauces and soy sauces Seasonings, and the like.

[Basic configuration of bottle 100]
The bottle 100 is configured so that a carbonated beverage can be filled. 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 . In addition, the thickness of each part of the bottle 100 is configured to be 0.7 mm or less, and this thickness is selected from the viewpoint of enhancing the moldability of the bottle 100. In the present embodiment, the full filling capacity of the bottle 100 is 410 mL. In this case, when the preform having a weight of 29 g is biaxially stretch blow-molded to obtain the bottle 100, the above-described wall thickness is realized. In addition, in order to withstand an increase in internal pressure due to carbon dioxide, the bottom portion 4 has a complicated uneven shape (a so-called petaloid shape) in which ground portions are scattered, and is formed thicker than other portions.

As shown in FIGS. 1 to 3, the shoulder 2 has a slope 21, a recess 22, and a protrusion 23 in order from the top. The slope portion 21 is a conical surface continuously provided below the mouth portion 1, and is configured such that an angle α formed by the conical surface and the axis X of the bottle 100 is 36 °. Recess 22, the radius of curvature R ₁ that continuously arranged below the inclined surface portion 21 is a concave curved surface of 20 mm, is configured to rush into the inside of the bottle 100. Further, the convex portion 23, the radius of curvature R ₂ that continuously provided above the lower and torso 3 of the concave portion 22 is a convex curved surface of the 3 mm, and is configured to protrude to the outside of the bottle 100.

  The diameter of the torso portion 3 is the largest 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 this portion is 68.0 mm. On the other hand, the central portion 3b of the trunk 3, which is the central portion in the vertical direction of the trunk 3, is smaller in diameter than the upper end portion 3a and the lower end portion 3c of the trunk. 67.5 mm. That is, the trunk 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 21 and the recess 22 are configured as described above, the shoulder main portion 24 of the shoulder 2 including the slope 21 and the recess 22 directly connects the lower end of the mouth 1 and the lower end of the shoulder 2. It has a shape depressed inside the bottle 100 more than the conical surface A. Further, the body center portion 3b has a shape that is recessed inside the bottle 100 from the cylindrical surface B that directly connects the body upper end portion 3a and the body lower end portion 3c.

[Carbonated beverage 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 200 filled with a carbonated beverage in a bottle 100 under the conditions of a filling pressure of 4.3 kgf / cm ² and a filling volume of 385 mL will be described as an example.

  When the carbonated beverage is filled in the bottle 100 under the above conditions and the bottle is sealed with the 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 between the inside and outside of the bottle 100, and the pressure difference acts as a load for pushing and expanding the bottle 100 from the inside to the outside of the bottle. Here, the convex portion 23 configured as a convex curved surface protruding to the outside of the bottle 100 and the bottom portion 4 formed thicker than other portions are not easily deformed by the applied load. On the other hand, the shoulder main portion 24 (slope portion 21, concave portion 22) and the trunk center portion 3b of the shoulder portion 2 are depressed inside the bottle 100 as described above, and therefore are easily pushed outward by the applied load. Therefore, when the bottle 100 is filled with the carbonated beverage, these portions are selectively deformed.

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

[Other embodiments]
Finally, another embodiment of the plastic bottle according to the present invention will be described. The configuration disclosed in each of the following embodiments can be applied in combination with the configuration disclosed in another embodiment as long as no contradiction occurs.

  In the above embodiment, the configuration in which the angle α formed between the conical surface forming the slope 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 and the axis of the plastic bottle may be 30 to 46 °. However, the angle is preferably 33 to 40 °, and more preferably 34 to 38 °, since a straight contour is easily obtained after filling the carbonated beverage.

The above embodiments, the radius of curvature R ₂ of the convex curved surface constituting the protrusion 23 has been described as an example the structure is 3 mm. 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 straight contour can be easily obtained after filling the carbonated beverage, the radius of curvature is preferably 4 mm or less, 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 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 thickness of the plastic bottle according to the present invention may be 0.3 mm or more and 0.8 mm or less. However, the thickness of the plastic bottle is preferably 0.4 mm or more because the value of the maximum filling pressure can be increased. In addition, the 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-described embodiment, the configuration has been described in which the bottle 100 having a full capacity of 410 mL is obtained by biaxially stretch-blowing a preform having a weight of 29 g. 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 manufacturing the plastic bottle according to the present invention is 24 to 48 g. It may be.

  In the above embodiment, the carbonated beverage product 200 in which the angle β between 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 between the conical surface and the axis may be 40 to 50 °.

In the above-described embodiment, the carbonated beverage product 200 in which the carbonated beverage is filled in the bottle 100 under the conditions of a filling pressure of 4.3 kgf / cm ² and a filling volume 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 volume may be 200 to 2000 mL. .

  Regarding other configurations, it should be understood that the embodiments disclosed in the present specification are illustrative in all points, and the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Therefore, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

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

100: plastic bottle 200: carbonated beverage product 1: mouth 2: shoulder 21: slope 22: concave 23: convex 24: shoulder main part 3: trunk 3a: trunk upper end 3b: trunk center 3c: trunk Lower end 4: Bottom 5: Cap X: Axis of plastic bottle 100 A: Conical surface directly connecting lower end of mouth 1 and lower end of shoulder 2 B: Upper end 3a and lower end 3c of trunk Directly connected cylindrical surface α: angle formed between conical surface forming slope 21 and axis X β: angle formed between conical surface A and axis X R ₁ : radius of curvature of concave portion 22 R ₂ : convex portion 23 Radius of curvature

Claims (6)

A plastic bottle comprising a shoulder having a slope portion and a concave portion, 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 provided continuously below the mouth portion, and is configured such that an angle between the conical surface and the axis of the plastic bottle is 30 to 46 °,
The plastic bottle, wherein the concave portion is a concave curved surface continuously provided below the slope portion, and is configured to protrude inside the plastic bottle. The shoulder further has a convex portion provided continuously with the concave portion and the body portion,
2. The plastic bottle according to claim 1, wherein the convex portion is a convex curved surface protruding outside the plastic bottle, and a radius of curvature of the convex curved surface in a vertical direction is 5 mm or less. 3.   The plastic bottle according to claim 1, wherein a difference between a minimum value and a maximum value of the diameter of the body is 1 mm or less. The plastic bottle according to any one of claims 1 to 3, wherein a maximum filling pressure is 3.5 kgf / cm ² or more.   The plastic bottle according to any one of claims 1 to 4, wherein a thickness of the plastic bottle is 0.3 mm or more and 0.8 mm or less. A carbonated beverage product filled with a carbonated beverage in the plastic bottle according to any one of claims 1 to 5,
In the state where the carbonated beverage is filled, the shoulder main portion consisting of the slope portion and the concave portion forms a conical surface connected below the mouth, and an angle formed by the shoulder main portion and the axis. Is a carbonated beverage product having an angle of 40 to 50 °.

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