JP6798770B2 - Round bottle - Google Patents

Description

The present invention relates to a circular bottle.

Conventionally, as a circular bottle formed of a synthetic resin material in a bottomed cylindrical shape, for example, as shown in Patent Document 1 below, a panel portion recessed inward in the radial direction thereof is provided on the cylindrical body portion. It is known that a plurality of panel portions are formed at intervals in the circumferential direction, and a pillar portion is formed between panel portions adjacent to each other in the circumferential direction.
In this configuration, for example, when the temperature of the contents sealed in the bottle drops and the inside of the bottle is decompressed, the panel portion is preferentially deformed inward in the radial direction (decompression deformation), so that the bottle is deformed. It absorbs the decompression in the bottle while suppressing the deformation in the part other than the panel part.

JP-A-2009-35263

However, the conventional circular bottle has a problem that when the inside of the bottle is depressurized and the panel portion is deformed, the impression of the cross-sectional shape of the body portion is deformed from a circular shape to a square shape, and the appearance quality is deteriorated. ..

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to deform the body under reduced pressure while maintaining the circular shape.

In order to solve the above problems, the present invention proposes the following means.
In the circular bottle according to the present invention, a plurality of flutes recessed inward in the radial direction are formed on the cylindrical body at intervals in the circumferential direction, and the flutes adjacent to each other in the circumferential direction are formed. A circular bottle having a column between them, and the vertical groove portion is a circumferential direction of the body portion of the body portion along the circumference of the bottle axis between the bottle shaft and the vertical groove portion in a cross-sectional view perpendicular to the bottle axis. The pillar portion has a linearly symmetrical shape with respect to the straight line connecting the central portion of the body portion, and the pillar portion is a straight line connecting the bottle axis and the central portion in the circumferential direction of the pillar portion in the cross-sectional view of the body portion. The plurality of the flutes are formed to have the same shape and the same size as each other, and the plurality of the pillars are formed to have the same shape and the same size. The flutes are a bottom wall portion that is located inside the top surface of the column portion in the radial direction and faces outward in the radial direction, and a side wall portion that extends outward in the radial direction from the outer peripheral edge of the bottom wall portion. The side wall portion is provided with a pair of vertical side wall portions that are connected to both ends in the circumferential direction of the bottom wall portion and extend in the bottle axis direction, and the end portions located inside in the radial direction in the vertical side wall portion. Is connected to the bottom wall portion via the first curved surface portion, and the end portion of the vertical side wall portion located on the outer side in the radial direction is connected to the top surface of the column portion via the second curved surface portion. In the cross-sectional view of the body portion, the first curved surface portion has a protrusion toward the inside in the radial direction, and the second curved surface portion has a protrusion toward the outside in the radial direction. The curvature of the curved surface portion is larger than the curvature of the second curved surface portion, and the width ratio C / A between the width A of the pillar portion and the width C of the vertical groove portion is 0.50 or more and 1.14 or less. In the cross-sectional view of the body portion, a virtual circle passing over each top surface of the plurality of pillar portions centered on the bottle axis and a virtual straight line connecting the radial outer end opening edges of the vertical groove portion. It is characterized in that the distance in the radial direction is 0.13 mm or more and 0.34 mm or less .

In this case, in the cross-sectional view of the body portion, the radial distance between the virtual circle and the virtual straight line is less than 1.0 mm, and the groove width of the vertical groove portion is suppressed to be narrow. Moreover, in the cross-sectional view of the body portion, the vertical groove portion and the pillar portion each exhibit a line-symmetrical shape. Further, the plurality of pillars and the plurality of flutes are formed in the same shape and the same size as each other. Therefore, when the pressure inside the circular bottle is reduced, the body portion can be uniformly reduced in diameter over the entire circumference, and the circular bottle can be deformed under reduced pressure while maintaining a circular shape without being deformed into a square shape.

According to the present invention, the body can be deformed under reduced pressure while maintaining the circular shape.

It is a side view of the circular bottle in embodiment of this invention. It is a cross-sectional view of the circular bottle shown in FIG. It is sectional drawing of the bottle explaining the verification test of this invention. It is a graph which shows the result of the 1st verification test of this invention. It is a graph which shows the result of the 2nd verification test of this invention.

Hereinafter, the circular bottle according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the circular bottle 1 according to the present embodiment includes a mouth portion 11, a shoulder portion 12, a body portion 13 and a bottom portion 14, and these 11 to 14 have a common central axis. It has a schematic configuration in which they are connected in this order while being positioned on the shaft.

Hereinafter, the above-mentioned common shaft is referred to as a bottle shaft O, and the mouth portion 11 side is referred to as an upper side and the bottom portion 14 side is referred to as a lower side along the bottle shaft O direction. In a plan view of the circular bottle 1 viewed from the bottle axis O direction, the direction orthogonal to the bottle axis O is called the radial direction, and the direction that orbits around the bottle axis O is called the circumferential direction.
The circular bottle 1 is integrally formed of a synthetic resin material. For example, a preform formed into a bottomed tubular shape by injection molding is blow-molded to form a preform. Further, a cap (not shown) is attached to the mouth portion 11. Further, each of the mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 has a circular cross-sectional view along the radial direction.

A peripheral groove portion 15 is continuously formed on the shoulder portion 12 over the entire circumference. A plurality of peripheral groove portions 15 (two in the illustrated example) are provided at intervals along the bottle axis O direction. The body portion 13 is formed in a cylindrical shape, is connected to the lower end of the shoulder portion 12, and extends downward. A label (for example, a shrink label) (not shown) is wrapped around the body 13. The body portion 13 is formed so as to have the same diameter from the upper side to the lower side. The bottom portion 14 is formed in a bottomed tubular shape and closes the lower end opening of the body portion 13. A first annular groove 16 is continuously formed in the connecting portion between the shoulder portion 12 and the body portion 13, and a second annular groove 17 is formed in the connecting portion between the body portion 13 and the bottom portion 14. It is formed continuously over the entire circumference.

In this circular bottle 1, a plurality of vertical groove portions 21 recessed inward in the radial direction are formed in the cylindrical body portion 13 at intervals in the circumferential direction, and the vertical groove portions 21 adjacent to each other in the circumferential direction are formed. The space between them is the pillar portion 22. That is, the vertical groove portions 21 and the pillar portions 22 are alternately arranged in the circumferential direction in the body portion 13. The vertical groove portion 21 and the pillar portion 22 extend along the bottle axis O direction at an intermediate portion of the body portion 13 that avoids both ends in the bottle axis O direction. The vertical groove portion 21 and the pillar portion 22 can be provided, for example, in an even number of each in the circumferential direction, and are set to 12 in each of the illustrated examples. In addition, an odd number of vertical groove portions 21 and column portions 22 may be provided in the circumferential direction.

As shown in FIG. 2, in a cross-sectional view of the body portion 13 orthogonal to the bottle axis O, the vertical groove portion 21 is a straight line connecting the bottle shaft O and the central portion in the circumferential direction of the vertical groove portion 21. The pillar portion 22 has a line-symmetrical shape, and the pillar portion 22 has a line-symmetrical shape with respect to a straight line connecting the bottle shaft O and the central portion in the circumferential direction of the pillar portion 22. The plurality of vertical groove portions 21 are formed to have the same shape and the same size as each other, and the plurality of pillar portions 22 are formed to have the same shape and the same size as each other.

The groove width (size along the circumferential direction) of the vertical groove portion 21 is gradually reduced from the outside to the inside in the radial direction, and the column width (size along the circumferential direction) of the pillar portion 22 is It gradually increases from the outside to the inside in the radial direction. The vertical groove portion 21 and the pillar portion 22 are each formed in an isosceles trapezoidal shape in the cross-sectional view. The top surface 23, which is the outer end surface in the radial direction of the pillar portion 22 facing outward in the radial direction, constitutes the maximum outer diameter portion on the outer peripheral surface of the body portion 13 and has a curved surface that protrudes outward in the radial direction. It is formed. In the circular bottle 1, the first virtual circle C1 (virtual circle) centered on the bottle shaft O passes on each of the top surfaces 23 of the plurality of pillar portions 22 in common.

The vertical groove portion 21 is located inside the top surface 23 of the pillar portion 22 in the radial direction and faces the outside in the radial direction, and the bottom wall portion 24 toward the outside in the radial direction from the outer peripheral edge of the bottom wall portion 24. It is defined by an extending side wall portion 25.
The bottom wall portion 24 is formed in a curved surface shape that protrudes outward in the radial direction in the cross-sectional view, and in this circular bottle 1, each bottom wall portion 24 in the plurality of flutes 21 is formed as a bottle shaft. The second virtual circle C2 centered on O passes in common. The second virtual circle C2 has a smaller diameter than the first virtual circle C1, and the difference in radius between the two virtual circles C1 and C2 is the depth of the vertical groove portion 21 (the height of the pillar portion 22).

As shown in FIGS. 1 and 2, the side wall portions 25 are connected to a pair of lateral side wall portions 26 located at both ends in the bottle axis O direction and extending in the circumferential direction, and both ends in the circumferential direction of the bottom wall portion 24, and the bottle shaft. It includes a pair of vertical side wall portions 27 extending in the O direction.
The pair of lateral side wall portions 26 are inclined surfaces that incline toward the outside in the bottle axis O direction from the inside to the outside in the radial direction. The pair of vertical side wall portions 27 are inclined toward the outer side in the circumferential direction (direction in which the vertical side wall portions 27 are separated) from the inner side in the radial direction to the outer side.

As shown in FIG. 2, the end portion located inside the vertical side wall portion 27 in the radial direction is connected to the bottom wall portion 24 via the first curved surface portion 28, and is located outside the vertical side wall portion 27 in the radial direction. The end portion to be formed is connected to the top surface 23 of the pillar portion 22 via the second curved surface portion 29. In the cross-sectional view, the first curved surface portion 28 has a protrusion toward the inside in the radial direction, and the second curved surface portion 29 has a protrusion toward the outside in the radial direction. In the illustrated example, the first curved surface portion 29 has a protrusion. The curvature of the curved surface portion 28 is larger than the curvature of the second curved surface portion 29.

In the present embodiment, in the cross-sectional view, the radial distance D between the first virtual circle C1 and the virtual straight line L connecting the radial outer end opening edges of the vertical groove portion 21 is less than 1.0 mm. It has become. The radial outer end opening edge of the vertical groove portion 21 is a portion where the first virtual circle C1 starts to be separated from the top surface 23 (outer peripheral surface of the body portion 13) of the pillar portion 22.

As described above, according to the circular bottle 1 according to the present embodiment, the radial distance between the first virtual circle C1 and the virtual straight line L is less than 1.0 mm in the cross-sectional view of the body portion 13. The groove width of the vertical groove portion 21 is suppressed to be narrow. Further, in the cross-sectional view of the body portion 13, the vertical groove portion 21 and the pillar portion 22 each have a line-symmetrical shape. Further, the plurality of pillar portions 22 and the plurality of flutes 21 are formed in the same shape and the same size as each other. Therefore, when the pressure inside the circular bottle 1 is reduced, the body portion 13 can be uniformly reduced in diameter over the entire circumference, and the circular bottle 1 can be deformed under reduced pressure while maintaining a circular shape without being deformed into a square shape. it can.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the number and arrangement of the flutes 21 can be appropriately changed in consideration of the strength required for the bottle, the decompression absorption capacity, and the like.
In the above embodiment, the vertical groove portion 21 and the pillar portion 22 are formed in an isosceles trapezoidal shape in the cross-sectional view, but the present invention is not limited to this. For example, the vertical groove portion 21 and the pillar portion 22 may be formed in a semicircular shape in the cross-sectional view. The semicircular shape described above can be formed by, for example, an arc, or a combination of an arc and a straight line.

The plurality of flutes 21 can be appropriately changed to a form formed having the same shape and the same size as each other, and the plurality of flutes 21 are not formed in the same shape and the same size. May be good. That is, the shapes and sizes of the plurality of flutes 21 may be slightly different from each other, and when the size of one of the plurality of flutes 21 as a reference is set to 1. If the size of the other flutes 21 is 0.9 to 1.1, substantially the same effect can be obtained. The size of the vertical groove portion 21 at this time includes, for example, the groove width and depth of the vertical groove portion 21.
Further, with respect to the plurality of pillar portions 22, similarly to the plurality of vertical groove portions 21, when the size of one pillar portion 22 as a reference among the plurality of pillar portions 22 is set to 1, the other pillar portions 22 If the size of is 0.9 to 1.1, substantially the same effect can be obtained. Examples of the size of the pillar portion 22 at this time include the pillar width and height of the pillar portion 22.

The synthetic resin material forming the bottle may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof.
Further, the bottle is not limited to a single-layer structure and may be a laminated structure having an intermediate layer. Examples of the intermediate layer include a layer made of a resin material having a gas barrier property, a layer made of a recycled material, a layer made of a resin material having an oxygen absorption property, and the like.

In addition, it is possible to replace the components in the embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

Next, the verification test of the action and effect described above will be described. As verification tests, the first and second verification tests were carried out.

(1st verification test)
In the first verification test, the shapes of nine types of circular bottles of Example 1 and Comparative Examples 1 to 8 were analyzed. Each circular bottle analyzed has the basic shape shown in FIG. 1, and is designed with an overall height of 179.0 mm, a body diameter of 70.0 mm, and a vertical groove depth of 3.0 mm.

In the first embodiment, in the shape of the body portion 13 shown in FIG. 3, the plurality of pillar portions 22 and the plurality of flutes 21 are formed to have the same shape and the same size, respectively, according to the circular bottle 1 according to the embodiment. Adopted the configuration.
In Comparative Examples 1 to 8, in the shape of the body portion 13 shown in FIG. 3, the plurality of pillar portions 22 have different sizes along the circumferential direction from each other. In Comparative Examples 1 to 8, the column portions adjacent to each other in the circumferential direction are formed by adjusting the positions of the vertical groove portions 21 in the circumferential direction while forming the plurality of vertical groove portions 21 in the same shape and the same size. The circumferential sizes of 22 were made different from each other. In Comparative Examples 1 to 8, every other pillar portion 22 had the same shape. That is, as the pillar portions 22, the first pillar portions 22a and the second pillar portions 22b having different sizes in the circumferential direction are alternately arranged in the circumferential direction.

The widths of the first pillar portion 22a, the second pillar portion 22b, and the flutes 21 in each of Example 1 and Comparative Examples 1 to 8 along the circumferential direction are adjusted as shown in Table 1 below. did. In the first embodiment, similarly to the circular bottle 1 according to the embodiment, the plurality of pillar portions 22 have the same shape and the same size as each other. In Table 1, the first pillar portion 22a in the first embodiment is shown. , The width of each of the second pillar portions 22b is set to the same value.
Here, the widths A, B, and C of the first pillar portion 22a, the second pillar portion 22b, and the flute portion 21 in Table 1 are the first in each of the first pillar portion 22a, the second pillar portion 22b, and the flute portion 21. It represents the size along the circumferential direction on the virtual circle C1. That is, the widths A and B of the first pillar portion 22a and the second pillar portion 22b in Table 1 are on the top surfaces 23 of the first pillar portion 22a and the second pillar portion 22b of the first virtual circle C1. The width C of the vertical groove portion 21 in Table 1 is the length of the arc portion connecting the outer end opening edges in the radial direction of the vertical groove portion 21 of the first virtual circle C1. That's right. The widths A, B, and C of the first pillar portion 22a, the second pillar portion 22b, and the flutes are proportional to the sizes of the central angles θa, θb, and θc formed by the corresponding arc portions centered on the bottle axis O, respectively. ..

Then, in this verification test, the absorption capacity of each of the circular bottles of Example 1 and Comparative Examples 1 to 8 was measured by reducing the pressure inside the bottle. The absorption capacity was measured when the variation in the amount of deformation in the column portion 22, that is, the difference in the amount of deformation in the most deformed portion and the least deformed portion on the top surface 23 of the pillar portion 22 became 1.0 mm. ..
The results are shown in Table 1 and FIG. FIG. 4 is a graph in which "column width ratio A / B" in Table 1 is plotted on the horizontal axis and "absorption capacity (ml)" is plotted on the vertical axis.

From these tables and graphs, the absorption capacity in Example 1 is maximized, and the circular bottle of Example 1 keeps the body portion 13 in a circular shape as compared with the circular bottles of Comparative Examples 1 to 8. It was confirmed that it can be greatly reduced in pressure (reduced diameter).

(Second verification test)
In the second verification test, in addition to Example 1 adopted in the first verification test, the shapes of four types of circular bottles of Examples 2 to 4 were analyzed. As in the first verification test, each circular bottle analyzed has the basic shape shown in FIG. 1, the total height is 179.0 mm, the body diameter is 70.0 mm, and the vertical groove depth is 3. It is designed as 0.0 mm.

In Examples 1 to 4, a configuration similar to the circular bottle 1 according to the above embodiment in which the plurality of pillar portions 22 and the plurality of flutes 21 are formed to have the same shape and the same size is adopted. In each of the circular bottles of Examples 1 to 4, the grooves of the pillar portion 22 and the vertical groove portion 21 were adjusted as shown in Table 2 below. The widths A and C of the pillars 22 and the flutes 21 in Table 2 have the same sizes as those in Table 1 along the circumferential direction of the pillars 22 and the flutes 21 on the first virtual circle C1. Represents. In Examples 1 to 4, the plurality of pillars 22 have the same shape and the same size as the circular bottle 1 according to the above embodiment. Therefore, in Table 2, the first pillar 22a And the second pillar part 22b are not distinguished and are unified as "pillar part", and the widths of all the pillar parts 22 are unified without distinguishing between the first pillar part 22a and the second pillar part 22b. It is written as "width of pillar A".

Then, in this verification test, in each of the circular bottles 1 of Examples 1 to 4, the inside of the bottle was depressurized and the absorption capacity was measured. The absorption capacity was measured at the same timing as in the first verification test.
The results are shown in Table 2 and FIG. “Distance D (mm)” in Table 2 is a value of the radial distance D between the first virtual circle C1 and the virtual straight line L in each of the circular bottles of Examples 1 to 4. The "ratio (%) of the pillars in the first virtual circle" in Table 2 is the ratio of the total width A of all the pillars 22 to the total length of the first virtual circle C1 (of all the pillars 22). It is a value obtained by (sum of width A) / (total length of the first virtual circle C1). FIG. 5 is a graph in which "width ratio C / A of column portion and vertical groove portion" in Table 2 is plotted on the horizontal axis and "absorption capacity (ml)" is plotted on the vertical axis.

From these tables and graphs, the absorption capacity increases in the order of Examples 2, 3, 1, 4, that is, from the bottle with the narrower groove portion 21 to the bottle with the wider vertical groove portion 21, and the width of the vertical groove portion 21 is widened. It was confirmed that the more bottles, the better the absorption capacity.

1 Circular bottle 13 Body 21 Vertical groove 22 Pillar 23 Top surface C1 First virtual circle (virtual circle)
D Distance L Virtual straight line O Bottle axis

Claims (1)

A plurality of vertical grooves that are recessed inward in the radial direction are formed on the cylindrical body at intervals in the circumferential direction, and the vertical grooves that are adjacent to each other in the circumferential direction are formed as pillars. It ’s a round bottle,
The vertical groove portion has a line-symmetrical shape with respect to a straight line connecting the bottle shaft and the central portion of the vertical groove portion in the circumferential direction along the circumference of the bottle axis in a cross-sectional view of the body portion orthogonal to the bottle axis. Presenting
The pillar portion has a line-symmetrical shape with respect to a straight line connecting the bottle shaft and the central portion in the circumferential direction of the pillar portion in the cross-sectional view of the body portion.
The plurality of flutes are formed in the same shape and the same size as each other.
The plurality of pillars are formed to have the same shape and the same size as each other.
The flutes are a bottom wall portion that is located inside the column portion in the radial direction and faces outward in the radial direction, and a side wall that extends outward in the radial direction from the outer peripheral edge of the bottom wall portion. It is defined by the department and
The side wall portion includes a pair of vertical side wall portions connected to both ends in the circumferential direction of the bottom wall portion and extending in the bottle axial direction.
The end portion of the vertical side wall portion located inside in the radial direction is connected to the bottom wall portion via the first curved surface portion.
The end portion of the vertical side wall portion located on the outer side in the radial direction is connected to the top surface of the pillar portion via the second curved surface portion.
In the cross-sectional view of the body portion, the first curved surface portion has a protrusion toward the inside in the radial direction, and the second curved surface portion has a protrusion toward the outside in the radial direction. The curvature of the curved surface portion is larger than the curvature of the second curved surface portion,
The width ratio C / A of the width A of the pillar portion and the width C of the vertical groove portion is 0.50 or more and 1.14 or less.
In the cross-sectional view of the body portion, a virtual circle passing over each top surface of the plurality of pillar portions centered on the bottle axis, and a virtual straight line connecting the radial outer end opening edges of the vertical groove portion with each other. A circular bottle characterized in that the radial distance between the two is 0.13 mm or more and 0.34 mm or less .

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