JP6910180B2 - Plastic bottle - Google Patents

Description

The present invention relates to a plastic bottle filled with a beverage, and particularly to a square tubular bottle, which relates to a technique for reducing the capacity while maintaining vending machine suitability (vending machine suitability).

Conventionally, as disclosed in Patent Document 1, when a plastic bottle filled with a beverage is sold by a vending machine, it is known that a problem such as clogging in the vending machine occurs, and in particular, It is generally known that defects become noticeable in square tubular (square) plastic bottles.

As described in Patent Document 1, the characteristic for preventing such a defect from occurring is known as vending machine suitability (vendor suitability), and in Patent Document 1, the amount of resin used is particularly reduced. Even if the weight of the bottle is reduced, the challenge is to obtain vending suitability.

Japanese Unexamined Patent Publication No. 2012-180122

From the viewpoint of vending machine suitability mentioned above, there are restrictions on the overall height and body diameter of plastic bottles that can be filled and sold in vending machines. It becomes important.

On the other hand, there are cases where it is required to reduce the capacity of plastic bottles for reasons such as consumer needs and strengthening of price competitiveness. However, in this case as well, it is necessary to consider the suitability of the vending machine, and as a means of achieving a small capacity while maintaining the required overall height and body diameter, a "neck shape" that curves inside the bottle is given to the entire body. Can be considered.

However, in a square tubular plastic bottle, if a constriction is given to the entire body portion, a portion having a maximum diameter cannot be secured, and there arises a problem that the suitability for a vending machine is lowered. For example, in the conceptual diagram of FIGS. 4A and 4B, if the entire body of the plastic bottle is constricted, the ratio of the straight portion (straight portion) constituting the maximum diameter portion is small. As a result, the contact portion between the upper stopper 91 and the bottle 80 provided in the path in the vending machine is reduced. Then, when the upper stopper 91 cannot hold the bottle 80 horizontally and becomes tilted, the bottle 80 does not completely fall during the time between the opening and returning of the upper stopper 91, and the rack wall 95 and the upper stopper 91 The bottle 80 is sandwiched between the two, which causes a defective return of the upper stopper 91 (FIG. 4 (B)).

Further, when the entire body portion is constricted, the diagonal portion (shoulder portion) of the bottle 80 that overhangs greatly is sandwiched in the gap portion of the upper stopper 91 when the upper stopper 91 returns, resulting in poor return of the upper stopper 91. It is easy to happen.

Further, if the number of straight portions constituting the maximum diameter portion is small, when the bottle 80 falls in the vending machine aisle at the time of product delivery, the contact with the attitude control damper 96 provided in the aisle becomes weak, and the attitude control action is exerted. There is a concern that it will become smaller and will not be able to keep its falling posture in the aisle horizontally, but will become vertically oriented and become clogged in the aisle.

The present invention has been made in view of the above problems, and proposes a technique for realizing a plastic bottle having high vending machine suitability and capable of reducing the capacity.

The problem to be solved by the present invention is as described above, and next, the means for solving this problem will be described.

That is, the invention of the present application is
It has a body that forms a horizontal cross section that connects four maximum distance points with respect to the central axis in the longitudinal direction of the plastic bottle.
The horizontal cross section of the body portion is composed of four arc-shaped corner portions including the maximum distance point and a side wall surface portion of a portion connecting adjacent corner portions.
The contour shape of the body that appears in the diagonal side view facing one of the corners is a substantially straight line shape that is substantially parallel to the central axis.
The contour shape of the body portion that appears in the side view facing one of the side wall surface portions is an arc shape that curves toward the central axis.
Use a plastic bottle.

Also, preferably
The body portion is divided into two parts, an upper body portion and a lower body portion, in the axial direction of the central axis by a circumferential groove.

Also, preferably
The distance from the central axis to the maximum distance point on the upper torso,
The distance from the central axis to the maximum distance point on the lower torso is
Almost the same,

Also, preferably
The minimum distance point at which the distance from the central axis is the smallest is arranged on the side wall surface portion of the horizontal cross section of the portion excluding the peripheral groove of the body portion.
The minimum distance point is in the axial direction of the central axis.
It is assumed that the size increases as the distance from the peripheral groove increases.

Also, preferably
It is assumed that the horizontal cross section of the peripheral groove is composed of an arcuate corner portion including a maximum distance point and a side wall surface portion of a portion connecting adjacent corner portions.
The boundary between the corner of the upper torso and the side wall,
The boundary between the corner of the peripheral groove and the side wall surface,
The boundary between the corner of the lower torso and the side wall,
It is assumed that a ridge line is formed by connecting each boundary portion of the above in the axial direction of the central axis.

Also, preferably
At least one decompression absorption panel shall be provided on the upper body.

Also, preferably
It is assumed that the lower body is not provided with a decompression absorption panel.

According to the configuration of the present invention, it is possible to realize a plastic bottle that has high vending machine suitability and can be reduced in capacity.

(A) is a side view of a plastic bottle according to an embodiment of the present invention. (B) is also a diagonal side view. (A) is a cross-sectional view taken along the line AA of FIG. 1 (A). (B) is also a cross-sectional view taken along the line AA. (C) is also a sectional view taken along line CC. (D) is also a cross-sectional view taken along the line DD. (E) is also a sectional view taken along line EE. (F) is also a cross-sectional view taken along the line FF. The figure explaining the contour of a plastic bottle. (A) is a diagram for explaining the suitability for vending machines. (B) is a diagram for explaining how a plastic bottle is clogged in a vending machine.

1A and 1B show a plastic bottle 1 according to an embodiment of the present invention, FIG. 1A is a side view and FIG. 1B is a diagonal side view. 2 (A) and 2 (B) are sectional views taken along line AA of FIG. 1 (A), FIG. 2 (C) is a sectional view taken along line CC, and FIG. 2 (D) is a sectional view taken along line DD. ) Is a cross-sectional view taken along the line EE, and (F) is a cross-sectional view taken along the line FF.

As shown in FIGS. 1 (A) and 1 (B) and 2 (A) to 2 (F), the plastic bottle 1 is
Cylindrical mouth 10 and
It is a horizontal cross section 22 that is continuous with the mouth portion 10, orthogonal to the central axis 12 of the mouth portion 10, and expands as the distance from the mouth portion 10 increases, and connects four maximum distance points Sa with the central axis 12 as a reference. The shoulder portion 20 forming the horizontal cross section 22 and
A body portion 30 that is continuous with the shoulder portion 20 and forms a horizontal cross section 32 formed by connecting four maximum distance points Sa with the central axis 12 as a reference.
It has a torso 30 and a continuous bottom 40 in order.
The body portion 30 is provided with a peripheral groove 50 that divides the body portion into two in the direction of the central axis 12 and divides the body portion into an upper body portion 36 and a lower body portion 38.

This plastic bottle 1 can be filled with various beverages such as various soft drinks, lactic acid bacteria beverages, milk beverages, tea, coffee, and water, and it is assumed that the plastic bottle 1 is particularly preferably used for what is generally called a non-carbonated beverage. Will be done.

The plastic bottle 1 is conventionally known as a PET bottle, and is formed by processing a preform by a biaxial stretching blow molding method.

Further, in the following description, the side closer to the mouth 10 side is the upper side, the side closer to the bottom 40 side is the lower side, and the direction away from the central axis 12 is the left-right direction.

As shown in FIGS. 1A and 1B, a male screw portion is provided on the outer circumference of the cylindrical mouth portion 10 so that a cap (not shown) can be screwed on. Further, the central axis 12 of the mouth portion 10 serves as the central axis of the plastic bottle 1.

The shoulder portion 20 constitutes a range from the boundary portion K12 with the mouth portion 10 to the boundary portion K23 with the body portion 30, and has a substantially linear inclined surface in the lateral view contour shown in FIG. 1 (A). None, even in the diagonal side view contour shown in FIG. 1 (B), a substantially linear inclined surface is formed.

FIG. 2A is a cross-sectional view taken along the line AA of FIG. 1A, showing an outline of the shape of the horizontal cross section 22 of the shoulder portion 20, and the contour of the horizontal cross section 22 indicates that the shoulder portion 20 is formed. The purpose is to explain the shape.

The horizontal cross section 22 is formed by connecting four maximum distance points Sa and Sa with reference to the central axis 12, and the maximum distance points Sa and Sa are uniform (90) in the circumferential direction about the central axis 12. It is arranged at a degree interval) and is located at a distance of a radius R1 from the central axis 12.

Further, in the horizontal cross section 22, the minimum distance point Sb at the shortest distance from the central axis 12 is formed at the central portion of the two adjacent maximum distance points Sa and Sa. The minimum distance point Sb is located at a distance of a radius R2 from the central axis 12. Then, the contour of the horizontal cross section 22 is formed by connecting the maximum distance point Sa and the minimum distance point Sb.

Further, in the horizontal cross section 22, the surface appearing parallel to the paper surface in FIG. 1A is the side wall surface portion 26s, and in FIG. 1B, the central portion in the left-right direction of the paper surface and the portion appearing in the left-right direction end portion are corner portions. It is set to 26k, and as shown in FIG. 2A, a horizontal cross section 22 is formed in which four side wall surface portions 26s are connected by four arc-shaped corner portions 26k. Further, the maximum distance point Sa is arranged at the corner portion 26k, and the corner portion 26k forms an arc having a radius R1.

As shown in FIG. 2 (A), at the boundary portion K23 (FIG. 1 (A)), the corner portion 26k forms an arc of about 40 degrees (angle θ) about the central axis 12, and other parts thereof. The portion of the side wall surface portion 26s is configured to form a substantially straight line.

As a result, as shown in FIGS. 1A and 1B, the side wall surface portion 26s forms a flat inclined surface, and the boundary between the corner portion 26k and the side wall surface portion 26s appears as a ridge line Q.

As shown in FIG. 1 (A), the body portion 30 constitutes a range between the boundary portion K23 with the shoulder portion 20 and the boundary portion K34 with the bottom portion 40, and the side surface shown in FIG. 1 (A). In the visual contour Ra, the central portion in the vertical direction of the central axis 12 has an arcuate shape that bends toward the central axis 12 (excluding the peripheral groove 50 portion), and the diagonal side view shown in FIG. 1 (B). The contour Rb has a substantially linear shape parallel to the central axis 12 (excluding the peripheral groove 50 portion). In each of FIGS. 1 (A) and 1 (B), the contours Ra and Rb are shifted to the right position and represented by a two-dot chain line.

Further, the contour Rc of FIG. 1 (B) corresponds to the arc-shaped contour Ra (FIG. 1 (A)), whereby the central portion in the vertical direction of the body portion 30 is gently curved inward. It is clarified that it is. Further, the contour Rd in FIG. 1B corresponds to a substantially linear contour Rb.

Further, the body portion 30 is provided with a peripheral groove 50 that divides the body portion into two in the direction of the central axis 12 and divides the body portion into an upper body portion 36 and a lower body portion 38. The peripheral groove 50 has a substantially V-shaped cross section having a slightly flat portion at the bottom, and is continuously provided in the circumferential direction orthogonal to the central axis 12. From the boundary portion K65 between the peripheral groove 50 and the upper body portion 36 and the boundary portion K85 between the peripheral groove 50 and the lower body portion 38, the deepest point S5 is reached via an inclined surface, respectively.

In the upper body portion 36, the surface appearing parallel to the paper surface in FIG. 1 (A) is referred to as the side wall surface portion 36s, and in FIG. As shown in FIG. 2B, the horizontal cross section 32 is configured in which the four side wall surface portions 36s are connected by the four arc-shaped corner portions 36k. The horizontal cross section 32 shown in FIG. 2B is a cross section of the boundary portion 23K with the shoulder portion 20, which is the same as the above-mentioned horizontal cross section 22 (same as FIG. 2A, and has a corner portion 36k. The maximum distance point Sa having a radius R1 is arranged, and the minimum distance point Sb having a radius R2 is arranged on the side wall surface portion 36s.

Further, as shown in FIGS. 1A and 1B, the side wall surface portion 36s of the upper body portion 36 has a trapezoidal decompression absorption panel P1 and a horizontal line shape (single character shape) arranged above the decompression absorption panel P1. ) Decompression absorption panel P2 (horizontal rib) is provided. These decompression absorption panels P1 and P2 can be appropriately designed for the purpose of ensuring strength and reducing the capacity, and may not be arranged.

The horizontal cross section 32 of the upper body portion 36 shown in FIG. 2C is a cross-sectional view taken along the line CC of FIG. 1, and the four side wall surface portions 36s have four arcuate shapes as in FIG. 2B. A horizontal cross section 32 connected by the corner portion 36k of the above is configured. The maximum distance point Sa is arranged at the corner portion 36k, and the corner portion 36k forms an arc having a radius R1.

Here, in the horizontal cross section 32 shown in FIG. 2C, the range of the corner portion 36k is narrower (angle θ: approximately 16 degrees) and the range of the side wall surface portion 36s is wider than that of FIG. 2B. NS. As a result, in FIG. 1 (A), a ridge line Q that expands in the direction away from the central axis 12 from top to bottom appears, and in FIG. 1 (B), a ridge line that approaches the central axis 12 from top to bottom. Q appears.

Further, as shown in FIGS. 2B and 2C, the radius R1 of the corner portion 36k at the boundary portion K23 of the upper body portion 36 (FIG. 2B) and the radius R1 of the corner portion 36k at the boundary portion K65 (FIG. 2B). FIG. 2C) is set to be substantially the same.

In this way, by setting the distance (radius R1) of the corner portion 36k from the central axis 12 in the upper trunk portion 36 to a substantially constant value, as shown in FIG. 1 (B), the upper trunk portion in the diagonal side view. The contour Rb of the corner portion 36k of the portion 36 appears as a substantially linear shape.

On the other hand, as shown in FIGS. 2 (B) and 2 (C), the side wall surface portion 36s at the boundary portion K65 is compared with the radius R2 (FIG. 2 (B)) of the side wall surface portion 36s at the boundary portion K23 of the upper body portion 36. The radius R2 (FIG. 2C) is configured to be small. Specifically, for example, the length of the radius R2 of the boundary portion K65 is set to 85% to 95% with respect to the radius R2 of the boundary portion K23.

As described above, the upper body portion 36 is designed so that the radius R2 becomes smaller from the top to the bottom, so that the side wall surface portion of the upper body portion 36 in the side view is as shown in FIG. 1 (A). At 36s, a contour Ra that curves toward the central axis 12 from top to bottom is formed.

Further, as shown in FIGS. 1 (A) and 1 (B), the lower body portion 38 constitutes between the boundary portion K85 and the boundary portion K34, and EE and F shown in FIG. 1 (A). The cross sections of the −F portions are represented as horizontal cross sections 32 in FIGS. 2 (E) and 2 (F), respectively.

In the lower body portion 38, similarly to the upper body portion 36, the surface appearing parallel to the paper surface in FIG. 1 (A) is the side wall surface portion 38s, and in FIG. 1 (B), the center portion in the left-right direction of the paper surface and the left-right end. The portion appearing in the portion is defined as a corner portion 38k, and as shown in FIGS. It has become.

Then, as shown in FIGS. 2 (E) and 2 (F), the lower body portion 38 also has the radius R1 (FIG. 2 (E)) of the corner portion 38k at the boundary portion K85 and the boundary portion, similarly to the upper body portion 36. The radius R1 (FIG. 2 (F)) of the corner portion 38k in K34 is set to be substantially the same.

In this way, even in the lower body portion 38, by setting the distance (radius R1) of the corner portion 38k from the central axis 12 to a substantially constant value, as shown in FIG. The contour Rb of the corner portion 38k of the body portion 38 appears as a substantially linear shape.

On the other hand, as shown in FIGS. 2 (E) and 2 (F), the side wall surface portion 38s at the boundary portion K34 is compared with the radius R2 (FIG. 2 (E)) of the side wall surface portion 38s at the boundary portion K85 of the lower body portion 38. The radius R2 (FIG. 2F) is configured to be large. Specifically, for example, the length of the radius R2 of the boundary portion K34 is set to 85% to 95% with respect to the radius R2 of the boundary portion K85.

In this way, the lower body portion 38 is designed so that the radius R2 increases from the top to the bottom, so that the side wall surface portion of the lower body portion 38 in the side view is as shown in FIG. 1 (A). At 38s, a contour Ra that curves away from the central axis 12 from top to bottom is formed.

In this embodiment, the range of the corner portion 38k at the boundary portion K85 (FIG. 2 (E)) is narrow (angle θ: approximately 16 degrees), and the range of the corner portion 38k at the boundary portion K34 (FIG. 2 (F)). Is narrow (angle θ: approximately 40 degrees). Further, in the horizontal cross section 32 of the lower body portion 38, the side wall surface portion 38s has an arc shape curved toward the central axis 12 side, but may have a linear shape. Further, the shape of the horizontal cross section 32 of the boundary portion K85 (FIG. 2 (E)) may be the same shape as the boundary portion K65 (FIG. 2 (C)) or may have a different shape.

Further, as shown in FIG. 2D, the horizontal cross section 32 of the peripheral groove 50 also has a corner portion 37k and a side wall surface portion 37s, so that the ridge line Q is also between the boundary portion K65 and the boundary portion K85. Is configured to appear.

As a result, a continuous ridge line Q can be formed from the upper end portion (boundary portion K23) of the upper body portion 36 to the lower end portion (boundary portion K34) of the lower body portion 38. In this embodiment, the horizontal cross section 32 of the boundary portion K65 (FIG. 2 (C)) and the boundary portion K85 (FIG. 2 (E)) has the same shape, and the peripheral groove 50 is horizontal by reducing this shape. It is assumed that the cross section 32 is formed.

Then, as described above, in each of the upper body portion 36 and the lower body portion 38, the four side wall surface portions are connected at the four corner portions, so that the square cylinder type plastic bottle 1 as a whole can be formed. It is composed.

A bottom portion 40 is formed at the lower portion of the lower body portion 38. A boundary portion K34 is formed between the lower body portion 38 and the bottom portion 40, a portion between the boundary portion K85 and the boundary portion K34 described above is defined as the lower body portion 38, and a portion below the boundary portion K34 is defined as the bottom portion 40. Defined. The vertical dimension of the bottom portion 40 is a little less than 1/4 of that of the lower body portion 38, and the contour of the bottom portion 40 appearing in the side view of FIG. The contour of the bottom portion 40 appearing in the diagonal side view of B) has a linear shape that gently faces the central axis 12 side toward the bottom surface at the bottom.

FIG. 3 shows the shape of the plastic bottle by extracting each cross section of FIG. 2, the contour Rb of the corner portion has a substantially straight shape (straight shape)), and the contour Ra of the wall surface portion has an arc shape. Represents.

As is clear from FIG. 3, since the contour Rb of the corner portion has a substantially linear shape, a square tubular plastic bottle can be formed as a whole. Then, the substantially straight contour Rb is formed over the substantially overall length of the body portion, so that the proportion of the straight portion constituting the maximum diameter portion can be increased, whereby the route in the vending machine can be increased. It is possible to secure a large number of contact portions between the stopper and the bottle to be provided, so that high vending machine suitability can be obtained.

In addition, "the contour Rb has a substantially linear shape" means that a large curvature is not intentionally formed so that the vertical center portion (near the peripheral groove 50) of the contour Rb approaches the central axis 12 side. This includes a slight curve to the opposite side, that is, a curve formed so that the vertical center portion (near the peripheral groove 50) of the contour Rb is separated from the central axis 12. Specifically, the curvature of the contour Rb is 0.0004 or less (radius 2500 mm or more) for the curved shape approaching the central axis 12 side, and the curvature of the contour Rb is 0.001 for the curved shape away from the central axis 12 side. Within the range of the following (radius of 1000 mm or more), it corresponds to the "contour Rb having a substantially linear shape" as referred to in the present invention.

Further, since the contour Ra of the wall surface portion has an arcuate shape, it is possible to reduce the capacity of the plastic bottle as compared with the case where the contour of the wall surface portion has a linear shape. In other words, it is possible to meet the needs for capacity reduction while ensuring high vending machine suitability. Further, by making the contour Rb a substantially linear shape, the suitability for a vending machine can be ensured, so that the degree of freedom in designing other parts can be increased.

Regarding the range of "the contour Ra has an arcuate shape", the curvature of the contour Ra is preferably 0.001 to 0.003 (radius 300 mm to 900 mm).

The present invention can be realized as described above.
That is, as shown in FIGS. 1 to 3,
It has a body portion 30 forming a horizontal cross section 32 formed by connecting four maximum distance points Sa with reference to a central axis 12 in the longitudinal direction of a plastic bottle.
The horizontal cross section 32 of the body portion has four arcuate corner portions 36k and 38k including the maximum distance point Sa and four side wall surface portions 36s and 38s connecting adjacent corner portions 36k and 38k. Configured,
The contour shape (contour Rb) of the body portion that appears in the diagonal side view facing one of the corner portions 36k and 38k is a substantially linear shape substantially parallel to the central axis 12.
The contour (contour Ra) shape of the body portion that appears in the side view facing one of the side wall surface portions 36s and 38s is a plastic bottle 1 that is an arc shape that curves toward the central axis 12.

With the above configuration, it is possible to realize a plastic bottle that has high vending suitability and can be reduced in capacity.

Further, as shown in FIGS. 1 (A) and 1 (B),
It is assumed that the body portion 30 is divided into two portions, an upper body portion 36 and a lower body portion 38, in the axial direction of the central axis 12 by the peripheral groove 50.

The peripheral groove 50 can secure the required strength.

The distance (radius R1) from the central axis 12 to the maximum distance point Sa in the upper body 36,
The distance (radius R1) from the central axis 12 to the maximum distance point Sa in the lower body 38 is
It is assumed that they are almost the same.

As a result, the maximum diameters of the upper body portion 36 and the lower body portion 38 can be matched, and the linear shapes of the corner portions 36k and 38k can be realized.

The minimum distance point Sb that minimizes the distance from the central axis 12 is arranged on the side wall surface portions 36s and 38s of the horizontal cross section 32 of the portion of the body portion 30 excluding the peripheral groove 50.
The minimum distance point Sb is the axial direction of the central axis 12.
It is assumed that the size increases as the distance from the peripheral groove 50 increases.

As a result, in the arcuate shape constituting the contour Ra, the vicinity of the peripheral groove 50 can be configured to be the deepest in the axial direction of the central axis 12, and the balance can be achieved in the item direction of the central axis 12 with the peripheral groove 50 as a reference. A good design can be realized. Further, since the diameter in the vicinity of the peripheral groove 50 is reduced, the configuration can be easily grasped by hand.

Further, as shown in FIG. 2D, the horizontal cross section 32 of the peripheral groove 50 has four arcuate corner portions 37k including the maximum distance point Sa and four side wall surface portions connecting adjacent corner portions 37k. It is assumed that it is composed of 37s and
The boundary between the corner 36k of the upper body 36 and the side wall surface 36s,
The boundary between the corner portion 37k of the peripheral groove 50 and the side wall surface portion 37s,
The boundary between the corner 38k of the lower body 38 and the side wall surface 38s,
It is assumed that a ridge line Q (FIGS. 1 (A) and 1 (B)) formed by connecting each boundary portion of the above is formed in the axial direction of the central axis 12.

Thereby, the design of the plastic bottle can be constructed by utilizing the shape of the ridge line Q.

Further, as shown in FIG. 1 (A), at least one decompression absorption panels P1 and P2 are provided on the upper body portion 36.

As a result, the decompression absorption panel can appropriately secure the required strength and reduce the capacity. Further, as a result, the lower body portion 38 can be provided with no decompression absorbing panel or lateral ribs, and the degree of freedom in design can be increased.

Further, as shown in FIG. 1 (A), it is assumed that the lower body portion 38 is not provided with the decompression absorption panel.

As a result, it is possible to realize a configuration in which the lower body portion 38 is not provided with the decompression absorption panel, and the degree of freedom in design can be increased.

10 Mouth 12 Central axis 20 Shoulder 22 Horizontal cross section 23K Boundary 30 Body 32 Horizontal cross section Sa Maximum distance point Sb Minimum distance point 36 Upper body 36k Corner 36s Side wall 38 Lower body 38k Corner 38s Side wall 40 Bottom 50 Circumferential groove P1 Decompression absorption panel P2 Decompression absorption panel Q Ridge line Ra Contour Rb Contour

Claims (6)

It has a body that forms a horizontal cross section that connects four maximum distance points with respect to the central axis in the longitudinal direction of the plastic bottle.
The horizontal cross section of the body portion is configured to include four arc-shaped corner portions including the maximum distance point and a side wall surface portion of a portion connecting adjacent corner portions.
The contour shape of the body portion that appears in the diagonal side view facing one of the corner portions is a substantially linear shape substantially parallel to the central axis.
Contour shape of the body appearing in a side view facing the one of said side wall portion, Ri arcuate shape der of curving the central axis side,
The body portion is divided into two parts, an upper body portion and a lower body portion, in the axial direction of the central axis by a circumferential groove.
The arc-shaped shape is a plastic bottle having a continuous arc shape such that the portion where the upper body portion and the lower body portion are divided is located most on the central axis side. The distance from the central axis to the maximum distance point in the upper body and
The distance from the central axis to the maximum distance point in the lower body is
Almost the same,
The plastic bottle according to claim 1. The minimum distance point at which the distance from the central axis is the smallest is arranged on the side wall surface portion of the horizontal cross section of the body portion excluding the peripheral groove.
The minimum distance point is in the axial direction of the central axis.
It becomes larger as the distance from the peripheral groove increases.
The plastic bottle according to claim 2. The horizontal cross section of the peripheral groove is configured to include an arcuate corner portion including a maximum distance point and a side wall surface portion at a portion connecting adjacent corner portions.
The boundary between the corner of the upper torso and the side wall,
The boundary between the corner of the peripheral groove and the side wall surface,
The boundary between the corner of the lower torso and the side wall,
A ridge line is formed by connecting each boundary portion of the above in the axial direction of the central axis.
The plastic bottle according to any one of claims 2 and 3, characterized in that. At least one decompression absorption panel is provided on the upper body portion.
The plastic bottle according to any one of claims 2 to 4 , wherein the plastic bottle is characterized in that. A decompression absorption panel is not provided on the lower body portion.
The plastic bottle according to any one of claims 2 to 5 , characterized in that.

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