JP2016020240A - Bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a bottle from tumbling down even when suppressing small ratio of a grounding diameter of a grounding part of the bottle to the overall height.SOLUTION: A bottom part 14 of a bottle 10 includes a center wall part 15 positioned on a bottle axis O and a connection circumferential wall part 16 connecting an outer circumferential edge of the center wall part 15 and a barrel part to each other, the connection circumferential wall part 16 includes three or more longitudinal recessed streak parts 17 formed circumferentially at intervals. A leg part 18 which projects from the center wall part 15 outward the bottle axis O is formed circumferentially at each of parts positioned between adjacent longitudinal recessed streak parts 17 of the connection circumferential wall part 16, a grounding part 22 which extends circumferentially is formed on the leg part 18, and a plurality of grounding parts 22 are arranged intermittently to the overall circumferential length in bottom surface view, ratio of a grounding diameter D of the grounding part 22 to the overall height of the bottle 10 being 0.230 or less and the total angle of center angles α that the respective grounding parts 22 contain around the bottle axis O in the bottom surface view being 60° or more and 180° or less.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bottle.

  Conventionally, for example, a bottle in which a cylindrical mouth portion, a shoulder portion, and a trunk portion and a bottomed cylindrical bottom portion are integrally formed of a synthetic resin material as shown in Patent Document 1 below is known. Yes. The bottom portion includes a central wall portion located on the bottle shaft, and a connecting peripheral wall portion that connects the outer peripheral edge of the central wall portion and the body portion. The connecting peripheral wall portion is formed with three or more vertical concave strip portions spaced in the circumferential direction, and each portion located between the adjacent vertical concave strip portions in the circumferential direction in the connecting peripheral wall portion. Are formed with leg portions that project outward from the central wall portion in the bottle axial direction. The leg portion is formed with a grounding portion extending in the circumferential direction, and the plurality of grounding portions are intermittently arranged over the entire length in the circumferential direction when the bottom portion is viewed from the outside in the bottle axial direction.

Japanese Patent No. 3616687

  However, in the conventional bottle, for example, by reducing the grounding diameter of the grounding portion in order to improve the pressure resistance of the bottle, or by making the bottle elongated in the axial direction of the bottle for design, etc. When the ratio of the ground contact diameter to the total height is kept low, there is a risk that the bottle will easily fall from an upright state. Then, for example, in order to fill the bottle with the contents, there is a problem that when the empty bottle is transported while being connected to the filling line, the bottle falls and the transport is stopped.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a bottle that can suppress overturning even if the ratio of the contact diameter of the contact portion to the overall height of the bottle is kept low. It is.

In order to solve the above problems, the present invention proposes the following means.
In the bottle according to the present invention, a cylindrical mouth portion, a shoulder portion and a trunk portion, and a bottomed cylindrical bottom portion are integrally formed of a synthetic resin material, and the bottom portion is a central wall located on the bottle shaft. And a connecting peripheral wall portion that connects the outer peripheral edge of the central wall portion and the body portion, and the connecting peripheral wall portion is formed with three or more vertical recesses spaced in the circumferential direction. In each portion located between the longitudinal concave portions adjacent to each other in the circumferential direction in the connection peripheral wall portion, leg portions that protrude outward in the bottle axial direction from the central wall portion are formed, The leg portion is formed with a grounding portion extending in the circumferential direction, and the plurality of grounding portions are intermittently arranged over the entire length in the circumferential direction in a bottom view when the bottom portion is viewed from the outside in the bottle axial direction. The grounding diameter of the grounding part with respect to the total height of the bottle (however, 60 mm, 64.61 mm, 66.4 The ratio of the central angle centered on the bottle axis formed by each of the ground contact portions in the bottom view is 60 ° or more and 180 ° or less. It is characterized by being.

  According to this invention, since the total angle is not less than 60 ° and not more than 180 °, a leg width that is a size along the circumferential direction of the ground contact portion in the leg portion is ensured while suppressing the size of the ground contact diameter. It is possible to prevent the bottle from falling even if the ratio of the contact diameter of the contact portion to the total height of the bottle is 0.230 or less, and to ensure the shapeability (formability) of the bottle. Can be made easier.

  That is, the theoretical value of the total angle is calculated by the following equation (1).

γ = 360-2n · Arccos ((2h / D) · tan θ)) (1)
γ: theoretical value of total angle (°) n: number of legs (n ≧ 3)
h: Height of center of gravity of empty bottle (mm)
D: Grounding diameter of grounding part (mm)
θ: Design value of the tipping angle (°)

  The fall angle θ means that the bottle is placed on the ground contact surface extending in the horizontal direction, and the ground contact surface is gradually tilted so that the central portion in the circumferential direction of the vertical groove portion of the bottle faces downward. When the bottle falls over, it means the inclination angle that the ground contact surface makes with respect to the horizontal plane. If the design value of the fall angle θ is 11 ° or more, the bottle can be effectively prevented from falling over. Can do.

  Here, based on the above equation (1), in the bottle in which the ratio of the ground contact diameter to the total height of the bottle (ground contact diameter / total height) is 0.230, the number of legs n is 5, The theoretical value of the total angle γ is calculated to be approximately 37 ° when the center of gravity height h is 107.5 mm, the ground contact diameter D of the ground contact portion is 49.45 mm, and the design value of the falling angle θ is 11 °. That is, in such a bottle, if the actual value of the total angle γ is 37 ° or more, the bottle can be prevented from falling over in theory. Note that the position of the center of gravity of the empty bottle in the bottle axis direction is a half of the total height of the bottle.

However, when the total angle is less than 60 °, the leg width of each leg portion becomes too small, and it may be difficult to ensure the shapeability of these leg portions.
Moreover, when the said total angle is larger than 180 degrees, the magnitude | size along the circumferential direction of each vertical groove part may become too small, and it may become difficult to ensure the shaping property of these vertical groove parts. There is.

  As mentioned above, while making the said total angle 60 degrees or more larger than 37 degrees and 180 degrees or less, while being able to suppress the fall of the said bottle, it is easy to ensure the shaping property of the said bottle. be able to.

  According to the bottle of the present invention, even if the ratio of the ground contact diameter of the ground contact portion to the overall height of the bottle is kept low, the overturn can be suppressed.

It is a front view of the bottle which concerns on one Embodiment of this invention. It is a bottom view of the bottle shown in FIG.

Hereinafter, a bottle according to an embodiment of the present invention will be described with reference to the drawings. The bottle may be filled with a content that increases the internal pressure of the bottle in a sealed state, such as a carbonated beverage, and may be used as a pressure-resistant bottle, a heat-resistant pressure bottle, or the like.
As shown in FIG. 1, a bottle 10 has a cylindrical mouth portion 11, a shoulder portion 12 and a trunk portion 13, and a bottomed cylindrical bottom portion 14 that are integrally formed of a synthetic resin material. It is formed by axial stretch blow molding. For example, polyethylene terephthalate may be employed as the synthetic resin material.

  Here, the central axes of the mouth part 11, the shoulder part 12, the body part 13 and the bottom part 14 are located on a common axis. Hereinafter, this common axis is referred to as the bottle axis O, the mouth 11 side along the bottle axis O direction is referred to as the upper side, and the bottom 14 side is referred to as the lower side. A direction perpendicular to the bottle axis O is referred to as a radial direction, and a direction around the bottle axis O is referred to as a circumferential direction.

  A male screw to which a cap (not shown) is detachably screwed is formed on the outer peripheral surface of the mouth portion 11. The shoulder portion 12 gradually increases in diameter from the upper side toward the lower side, and the lower end portion of the shoulder portion 12 is smoothly connected to the upper end portion of the trunk portion 13 without a step. The body portion 13 is formed in a cylindrical shape and has the same diameter over the entire length in the bottle axis O direction. In the illustrated example, the body portion 13 has the largest outer diameter in the bottle 10 over the entire length. It is a diameter part.

As shown in FIGS. 1 and 2, the bottom portion 14 includes a central wall portion 15 located on the bottle shaft O, and a connecting peripheral wall portion 16 that connects the outer peripheral edge of the central wall portion 15 and the body portion 13. I have.
Each of the front and back surfaces of the central wall portion 15 faces the bottle axis O direction, and the central wall portion 15 is formed in a circular shape in a bottom view when the bottom portion 14 is viewed from the lower side (outside in the bottle axis direction). In the illustrated example, the central wall portion 15 is arranged coaxially with the bottle axis O.

Three or more vertical concave strips 17 are formed in the connection peripheral wall 16 at intervals in the circumferential direction, and are positioned between the vertical concave strips 17 adjacent in the circumferential direction in the connection peripheral wall 16. Each part is formed with a leg 18 projecting downward (outside in the bottle axial direction) from the central wall 15, and the bottom of the bottle 10 is formed in a so-called petaloid shape.
Each of the vertical concave stripe portion 17 and the leg portion 18 is formed in an odd number, and in the illustrated example, five pieces are formed. In addition, the plurality of vertical recess portions 17 are formed in the same shape and size as each other, and are arranged at equal intervals in the circumferential direction. Further, the plurality of leg portions 18 are formed in the same shape and size as each other, and are arranged at equal intervals in the circumferential direction.

The leg portion 18 has an inner wall portion 19 extending from the central wall portion 15 toward the outer side in the radial direction, and an upper end portion extending from the outer end portion in the radial direction of the inner wall portion 19 toward the upper side. The outer wall part 20 to be connected is provided, and a pair of side wall parts 21 that are arranged at intervals in the circumferential direction and are connected to the side end parts in the circumferential direction of the inner wall part 19 and the outer wall part 20 are provided.
The front and back surfaces of the inner wall portion 19 each face the bottle axis O direction, and the inner wall portion 19 gradually extends downward as it goes outward in the radial direction. The inner wall portion 19 is curved so as to form a curved shape that protrudes upward in the longitudinal sectional view of the bottle 10. The radially outer end portion of the inner wall portion 19 is located on the radially inner side of the body portion 13.

The front and back surfaces of the outer wall portion 20 each face the radial direction, and the outer wall portion 20 gradually extends outward in the radial direction from the lower side toward the upper side. A lower end portion connected to the inner wall portion 19 in the outer wall portion 20 is curved so as to form a curved shape projecting outward in the radial direction in the longitudinal sectional view. The upper end portion of the outer wall portion 20 that is connected to the body portion 13 has the same radial position as the body portion 13 and is smoothly connected to the body portion 13 without any step.
The front and back surfaces of the side wall portion 21 face each other in the circumferential direction, and the surface of the side wall portion 21 constitutes a wall surface that defines the vertical concave stripe portion 17.

  The leg 18 is formed with a grounding portion 22 extending in the circumferential direction. The grounding portion 22 is a connecting portion between the inner wall portion 19 and the outer wall portion 20 in the leg portion 18, and serves as a lower end of the leg portion 18. Further, as shown in FIG. 2, the plurality of grounding portions 22 are intermittently disposed over the entire length in the circumferential direction in the bottom view, and extend along the same virtual circle R around the bottle axis O. doing.

  The grounding portion 22 has a very small size along the radial direction, and may be formed in a linear shape so as to make point contact with the grounding surface at each position along the circumferential direction. May be secured, and may be formed in a planar shape in line contact with the ground contact surface at each position along the circumferential direction. In addition, when the grounding portion 22 is formed in a planar shape as described above, the grounding diameter D of the grounding portion 22 is, for example, centered on the bottle axis O and each end on the radially outer side of the plurality of grounding portions 22. It is good also as a diameter of the virtual circle which passes an edge.

Here, as shown in FIGS. 1 and 2, the grounding diameter D of the grounding portion 22 with respect to the length from the upper end of the mouth portion 11 to the lower end of the bottom portion 14 along the bottle axis O direction, which is the total height L of the bottle 10. The ratio of the diameter of the virtual circle R, that is, D / L is 0.230 or less.
In the present embodiment, in the bottom view, the total angle (5 · α in the illustrated example) of the central angle α around the bottle axis O formed by each grounding portion 22 is 60 ° or more and 180 ° or less. It has become.

  As described above, according to the bottle 10 according to this embodiment, since the total angle is 60 ° or more and 180 ° or less, the size of the ground contact diameter D is suppressed, and the ground contact portion 22 of the leg portion 18 is suppressed. A leg width W that is a size along the circumferential direction can be secured, and the ratio of the ground contact diameter D of the ground contact portion 22 to the total height L of the bottle 10 is slender and high in overall height such as 0.230 or less. 10 can suppress overturning and can easily ensure the shapeability (moldability) of the bottle 10.

  That is, the theoretical value of the total angle is calculated by the following equation (1).

γ = 360-2n · Arccos ((2h / D) · tan θ)) (1)
γ: theoretical value of total angle (°) n: number of legs (n ≧ 3)
h: Height of center of gravity of empty bottle (mm)
D: Grounding diameter of grounding part (mm)
θ: Design value of the tipping angle (°)

  The falling angle θ is set so that the bottle 10 is placed on a grounding surface (not shown) extending along the horizontal direction, and the center portion in the circumferential direction of the longitudinal concave portion 17 of the bottle 10 faces downward. When the bottle 10 falls down by gradually tilting, the inclination angle that the ground contact surface makes with the horizontal plane is said. If the design value of the fall angle θ is 11 ° or more, the bottle 10 is overturned. It can be effectively suppressed.

  Here, based on the above formula (1), the number n of the leg portions 18 in the bottle 10 in which the ratio of the ground contact diameter D of the ground contact portion 22 to the total height L of the bottle 10 (ground contact diameter D / total height L) is 0.230. 5 is the theoretical value of the total angle γ when the center of gravity height h of the empty bottle 10 is 107.5 mm, the grounding diameter D of the grounding part 22 is 49.45 mm, and the design value of the tipping angle θ is 11 °. When calculated, it is about 37 °. That is, in such a bottle 10, if the actual value of the total angle γ is 37 ° or more, the bottle 10 can be prevented from falling over in theory. Note that the position of the center of gravity of the empty bottle 10 in the direction of the bottle axis O is a half of the total height L of the bottle 10.

However, when the total angle is less than 60 °, the leg width W of each leg 18 becomes too small, and it may be difficult to ensure the shapeability of these legs 18.
In addition, when the total angle is larger than 180 °, the size along the circumferential direction of each vertical groove 17 is too small, and it is difficult to ensure the shapeability of these vertical grooves 17. There is a risk.

  From the above, by making the total angle 60 ° or more larger than 37 ° and 180 ° or less, the bottle 10 can be prevented from falling, and the shapeability of the bottle 10 can be secured. Can be made easier.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, five vertical concave portions 17 and leg portions 18 are formed, but the number is not limited to this as long as three or more are formed.
Furthermore, in the said embodiment, although the vertical concave strip part 17 and the leg part 18 were each formed in odd numbers, you may be formed in even numbers.

  Moreover, in the said embodiment, although the trunk | drum 13 shall be the said largest diameter part over the full length, it is not restricted to this, For example, the upper end part or lower end part of the trunk | drum is limited to the said largest diameter part. May be.

In designing the bottle 10, for example, first, the number n of the leg portions 18, the center of gravity height h of the bottle 10, and the ground contact diameter D of the ground contact portion 22 are set, and these numerical values are substituted into the above equation (1). The theoretical value of the total angle γ is calculated, and based on this theoretical value, the actual value of the total angle γ is set to a value within the range of 60 ° to 180 ° and higher than the theoretical value. Good.
If n = 5, h = 107.5 (mm), D = 47.88 (mm), and θ = 11.0 (°), in the above equation (1), γ = 67.9 (°) It becomes.
Further, when n = 5, h = 109 (mm), D = 47.65 (mm), and θ = 11.0 (°), in the above equation (1), γ = 87.8 (°). .
Further, when n = 5, h = 107.5 (mm), D = 47.88 (mm), and θ = 11.58 (°), in the above equation (1), γ = 129.4 (°) It becomes.
Further, assuming that n = 5, h = 109 (mm), D = 47.65 (mm), and θ = 11.41 (°), in the above equation (1), γ = 13.4 (°). .
Here, in the bottle 10 in which the actual value of the total angle γ is equivalent to the theoretical value of the total angle γ calculated by the above formula (1), the actual value of the tipping angle θ is, for example, a manufacturing variation (meat The design value of the fall angle θ may be different from the design value of the fall angle θ. For example, it may be smaller than the design value of the fall angle θ so as not to affect the actual use.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 10 Bottle 11 Mouth part 12 Shoulder part 13 Body part 14 Bottom part 15 Central wall part 16 Connection surrounding wall part 17 Vertical concave part 18 Leg part 22 Grounding part D Grounding diameter L Total height O Bottle axis

Claims (1)

A cylindrical mouth portion, a shoulder portion and a trunk portion, and a bottomed cylindrical bottom portion are integrally formed of a synthetic resin material,
The bottom includes a central wall located on the bottle shaft, and a connecting peripheral wall connecting the outer peripheral edge of the central wall and the trunk.
In the connecting peripheral wall portion, three or more vertical concave strip portions are formed at intervals in the circumferential direction,
Each portion located between the longitudinal concave portions adjacent to each other in the circumferential direction in the connection peripheral wall portion is formed with a leg portion that protrudes outward in the bottle axial direction from the central wall portion,
A grounding portion extending in the circumferential direction is formed on the leg portion,
The plurality of grounding portions are intermittently arranged over the entire length in the circumferential direction in the bottom view when the bottom portion is viewed from the outside in the bottle axial direction.
The ratio of the ground contact diameter of the ground contact portion (excluding 60 mm, 64.61 mm, and 66.43 mm) to the total height of the bottle is 0.230 or less,
In the bottom view, the total angle of the central angles around the bottle axis formed by each of the grounding portions is 60 ° or more and 180 ° or less.

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