JP2023065250A - synthetic resin bottle - Google Patents

Abstract

To provide a synthetic resin bottle reliably allowing decompression deformation of a protrusion part.SOLUTION: A synthetic resin bottle 1 has a mouth 2 for spouting a content, a shoulder part 3 integrally connected to the mouth 2, a shank 4 integrally connected to the shoulder part 3 and a bottom part 5 integrally connected to the shank 4, and is formed to exhibit a decompression absorption function by displacement of the bottom part 5 to the inward direction of the shank 4 with decompression of the inside. In the synthetic resin bottle 1, the bottom part 5 has an annular peripheral edge part 10, an annular protrusion part 13 which is provided inside the peripheral edge part 10 in the radial direction, protruded downward from the peripheral edge part 10 and serves as an earthing part of the synthetic resin bottle 1, while displaces in the inner direction of the shank 4 with the decompression inside the synthetic resin bottle 1 and makes the peripheral edge part 10 function as the earthing part, a caving recessed part 15 provided inside the protrusion part 13 in the radial direction and caved inward the shank 4, and multiple parting grooves 20 provided at the protrusion part 13 and parting the protrusion part 13 in the circumferential direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a synthetic resin bottle.

Conventionally, in a synthetic resin bottle such as a PET bottle (polyethylene terephthalate resin bottle), when filling the inside with contents such as fruit juice drinks and tea, for the purpose of sterilizing the contents and the bottle, for example, 90 A so-called high-temperature filling method is used in which contents are filled into a bottle at a temperature of around °C and immediately capped and sealed.

In hot filling, since the bottle is cooled after it is sealed, the inside of the bottle becomes considerably decompressed, which may cause an unsightly deformation of the bottle.

Therefore, conventionally, in order to suppress the deformation, the bottom portion is composed of an annular peripheral portion, an annular ridge portion provided radially inward from the peripheral portion, and a trunk portion provided radially inward from the ridge portion. The ridge protrudes downward from the peripheral edge and functions as a grounding portion of the synthetic resin bottle. A synthetic resin bottle has been developed in which the portion is displaced toward the inside of the body portion so that the peripheral portion functions as a grounding portion (see, for example, Patent Document 1).

In the bottle of Patent Document 1, since the bottom part has a vacuum absorption function, it is not necessary to provide a vacuum absorption panel on the body, which is conspicuous in appearance of the bottle. Surface rigidity can be maintained and high shape retention can be imparted.

Japanese Patent No. 6153741

However, even in the above-described conventional bottle, depending on the conditions when filling the high-temperature content, part of the ridge that functions as a grounding portion before decompression may remain partially even after the inside of the bottle is decompressed. However, there is a problem that the bottle may remain in a state of protruding downward from the peripheral portion, and the stability of the bottle on the ground after being deformed under reduced pressure may be impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to provide a synthetic resin bottle in which the protrusion can be reliably deformed under reduced pressure.

The synthetic resin bottle of the present invention comprises a mouth portion for pouring out contents, a shoulder portion integrally connected to the mouth portion, a body portion integrally connected to the shoulder portion, and a bottom portion integrally connected to the body portion. A synthetic resin bottle configured to exhibit a reduced pressure absorption function by displacing the bottom portion toward the interior of the body portion as the pressure is reduced, wherein the bottom portion includes an annular peripheral edge portion and the peripheral edge portion It is provided further inward in the radial direction, protrudes downward from the peripheral edge portion, and functions as a grounding portion of the synthetic resin bottle. An annular ridge portion that causes the peripheral edge portion to function as a grounding portion, a depressed recess that is provided radially inward from the ridge portion and is depressed toward the inside of the body portion, and a recessed portion that is provided in the ridge portion. , and a plurality of dividing grooves for dividing the ridge portion in the circumferential direction.

In the synthetic resin bottle of the present invention, in the above configuration, it is preferable that a plurality of dividing grooves are provided in the ridge portion at regular intervals in the circumferential direction.

In the synthetic resin bottle of the present invention, in the above configuration, it is preferable that the rib portion is provided with the dividing grooves in multiples of 3.

In the above configuration of the synthetic resin bottle of the present invention, it is preferable that a plurality of generally triangular concave portions tapering radially inward are provided in the peripheral portion.

In the synthetic resin bottle of the present invention, in the configuration described above, the same number of triangular recesses as the dividing grooves are provided on the peripheral edge portion such that the apexes facing radially inward are aligned with the circumferential positions of the corresponding dividing grooves. It is preferable that

According to the present invention, it is possible to provide a synthetic resin bottle in which the protrusion can be reliably deformed under reduced pressure.

1 is a front view of a synthetic resin bottle according to an embodiment of the present invention before being deformed under reduced pressure; FIG. FIG. 2 is a bottom view of the synthetic resin bottle shown in FIG. 1; Figure 3 is a cross-sectional view along AA in Figure 2 of the bottom portion shown in Figure 1; FIG. 2 is a front view of the synthetic resin bottle shown in FIG. 1 after being deformed under reduced pressure;

Hereinafter, the present invention will be described more specifically by way of example with reference to the drawings.

A synthetic resin bottle 1 according to an embodiment of the present invention is used for containing contents such as fruit juice beverages and tea by hot filling.

The synthetic resin bottle 1 is made of, for example, polyethylene terephthalate resin, and has a mouth portion 2 that opens upward to pour out the contents, a shoulder portion 3 that is integrally connected to the mouth portion 2, and a shoulder portion 3 that is integrally connected to the shoulder portion 3. It has a bottle shape with a trunk portion 4 and a bottom portion 5 integrally connected to the trunk portion 4, and the inside thereof serves as a storage space for contents.

In this embodiment, the mouth portion 2 has a cylindrical shape centered on the axis O, and a male thread 6 for attaching a cap (not shown) by screwing is provided integrally on the outer peripheral surface thereof. The shape of the mouth portion 2 is not limited to a cylindrical shape, and may be a square tube shape, an elliptical tube shape, or the like. The mouth portion 2 can also be configured to integrally include an annular projection for attaching a cap by tapping.

In this embodiment, the body portion 4 is cylindrical with the axis O as the center. Five circumferential grooves 7 extending in the circumferential direction around the axis O are provided on the outer peripheral surface of the body portion 4 at intervals in the vertical direction. A so-called decompression absorption panel is not provided on the outer peripheral surface of the body portion 4 . In this way, the trunk portion 4 is not provided with a pressure reduction absorption panel and is provided with five circumferential grooves 7, so that the surface rigidity is enhanced and good shape retention can be exhibited. can. The body portion 4 may be configured with a number other than five of the circumferential grooves 7, or may be configured with longitudinal ribs for reinforcement in addition to the circumferential grooves 7 or instead of the circumferential grooves 7. The configuration can be changed as appropriate. Also, the circumferential groove 7 may not be provided on the outer peripheral surface of the body portion 4 .

The bottom portion 5 is configured to be displaced toward the inside of the body portion 4 (upward in FIG. 1) as the pressure inside the synthetic resin bottle 1 is reduced, thereby exerting a pressure reduction absorbing function.

More specifically, as shown in FIGS. 1 to 3, the bottom portion 5 has an annular peripheral edge portion 10 located at the radially outermost portion about the axis O. As shown in FIGS. In this embodiment, the peripheral edge portion 10 has an annular shape, and is integrally connected to the lower edge of the trunk portion 4 and the heel wall portion 11 having a downward convex curved shape and the radially inner edge of the heel wall portion 11 . and an annular flat portion 12 provided at the bottom.

In the present embodiment, the flat portion 12 is inclined upward inward in the radial direction. As a result, even if the synthetic resin forming the bottom portion 5 is softened and easily deformed during high-temperature filling, it is possible to prevent the bottom portion 5 from excessively expanding and deforming downward due to the weight of the contents. Note that the plane portion 12 may be configured so as not to be inclined.

The bottom portion 5 is also integrally provided with a ridge portion 13 radially inward of the peripheral edge portion 10 . In the present embodiment, the ridge portion 13 has a flat tip portion 13c between an outer peripheral side portion 13a and an inner peripheral side portion 13b extending downward with respect to the flat portion 12. The cross section perpendicular to the circumferential direction is approximately It is configured as an annular rib that has a trapezoidal shape and extends around the axis O. As shown in FIG. In the present embodiment, the distal end portion 13c is slightly inclined upward inward in the radial direction, but it may extend horizontally or may be curved in a U shape.

In a normal state in which the interior of the synthetic resin bottle 1 is not decompressed, the tip portion 13c of the projecting portion 13 protrudes downward from the peripheral edge portion 10 over the entire circumference, and serves as a grounding portion of the synthetic resin bottle 1. configured to function. On the other hand, when the interior of the synthetic resin bottle 1 is decompressed, the projection 13 moves toward the inside of the barrel 4 (upward in FIGS. 1 and 3) as the interior of the synthetic resin bottle 1 is decompressed. is configured to be displaced to As a result, when the interior of the synthetic resin bottle 1 is decompressed, the entire protrusion 13 is displaced so as to be positioned above the lower end of the peripheral portion 10, as indicated by the two-dot chain line in FIG. , so that the peripheral edge portion 10 functions as a grounding portion in place of the ridge portion 13.例文帳に追加

The bottom portion 5 can also have a configuration in which a groove-shaped concave portion 14 is provided between the inner peripheral edge of the flat portion 12 and the ridge portion 13 . As a result, when the inside of the synthetic resin bottle 1 is decompressed, the protrusion 13 can be more easily displaced.

The bottom portion 5 is further integrally provided with a recessed portion 15 that is recessed toward the inside of the body portion 4 (upward in FIGS. 1 and 3) radially inwardly of the ridge portion 13 . The recessed portion 15 as a whole is recessed in a dome shape toward the inner space of the body portion 4, and reinforcing ribs 16 bulging outward and extending radially are provided on the lower surface of the recessed portion 15 at regular intervals in the circumferential direction. are placed side by side. It should be noted that the shape of the depression 15 and the shape and number of the reinforcing ribs 16 can be changed as appropriate.

In the synthetic resin bottle 1 of the present embodiment, the protrusion 13 is provided with a plurality of dividing grooves 20 for dividing the protrusion 13 in the circumferential direction.

As shown in FIGS. 2 and 3, the ridge portion 13 is provided with six dividing grooves 20 at regular intervals in the circumferential direction. Each of the six dividing grooves 20 extends radially along the axis O, and has an elongated trapezoidal cross section having a pair of flat side surfaces 20a and a flat bottom surface 20b. Extending from the outer peripheral side portion 13a to the inner peripheral side portion 13b of the ridge portion 13, the tip portion 13c of the ridge portion 13 is divided into six parts in the circumferential direction. The shape of the dividing groove 20 is not limited to a trapezoidal cross section. For example, the cross section of the bottom surface 20b may be an arc shape, or the cross section may be an overall semicircular (arcuate) shape. Can be changed.

The number of dividing grooves 20 provided in the ridge portion 13 can be varied, but is preferably a multiple of three. When the interior of the synthetic resin bottle 1 is decompressed and the ridge 13 is displaced upward, it is empirically known that folds of multiples of 3 are often formed on the plane portion 12 of the peripheral portion 10. It has been known. Therefore, by setting the number of dividing grooves 20 provided in the ridge portion 13 to be a multiple of 3, the ridge portion 13 can be displaced upward while suppressing the formation of creases in the plane portion 12 .

The bottom portion 5 may also have a configuration in which a plurality of triangular recesses 30 each tapering radially inward and having a generally triangular shape when viewed from the bottom are provided in the peripheral edge portion 10 . In the present embodiment, six triangular recesses 30, which are the same number as the dividing grooves 20, are provided in the peripheral edge portion 10 such that the apexes facing radially inward coincide with the circumferential positions of the corresponding dividing grooves 20. As shown in FIG. The other two vertices of the six triangular recesses 30 are all arranged on the same imaginary circle radially outward from the vertexes facing radially inward. 3, the inner peripheral edge of the triangular recessed portion 30 at the center portion in the circumferential direction is positioned radially outward from the inner peripheral edge of the flat portion 12, and the outer peripheral edge is located at the heel wall portion 11. (a portion connected to the lower edge of the body portion 4) in the radial direction, and is inclined upward toward the radial direction outside. Although each triangular recess 30 is not connected to the groove-shaped recess 14 in this embodiment, each triangular recess 30 may be connected to the groove-shaped recess 14 .

The synthetic resin bottle 1 having the above structure is filled with the content from the mouth portion 2 at a high temperature, and after the mouth portion 2 is capped and cooled, the interior of the synthetic resin bottle 1 is decompressed. , the ridges 13 forming the bottom 5 extend upward toward the inside of the body 4 so that the whole is positioned above the lower end of the peripheral edge 10, as indicated by the two-dot chain line in FIG. Displace. As a result, as shown in FIG. 4, the synthetic resin bottle 1 has a shape in which the peripheral edge portion 10 functions as a grounding portion instead of the ridge portion 13 .

At this time, in the synthetic resin bottle 1 of the present embodiment, when the interior of the synthetic resin bottle 1 is decompressed, the protrusion 13 displaces toward the inside of the body 4, and the protrusion 13 is displaced toward the inside. Since a plurality of dividing grooves 20 are provided for dividing in the direction, when the inside of the synthetic resin bottle 1 is in a decompressed state, each part of the ridge portion 13 divided by the plurality of dividing grooves 20 can be further separated. By enabling deformation with a high degree of freedom, the entire protrusion 13 can be reliably displaced upward. As a result, when the interior of the synthetic resin bottle 1 is decompressed, the protrusion 13 is reliably deformed under reduced pressure so that the entire protrusion 13 is positioned above the lower end of the peripheral edge 10. It is possible to prevent the stability of the synthetic resin bottle 1 from being impaired after the protrusion 13 is deformed under reduced pressure.

In addition, in the synthetic resin bottle 1 of the present embodiment, since a plurality of dividing grooves 20 are provided in the ridge portion 13 at equal intervals in the circumferential direction, the inside of the synthetic resin bottle 1 is in a decompressed state. Sometimes, each portion of the ridge portion 13 divided by the plurality of dividing grooves 20 can be deformed with a higher degree of freedom at any portion in the circumferential direction, so that the entire ridge portion 13 can be divided. can be reliably displaced upward.

Furthermore, in the synthetic resin bottle 1 of the present embodiment, the peripheral portion 10 is provided with a plurality of generally triangular concave portions 30 each tapered radially inward. When the interior of is in a decompressed state, the peripheral edge portion 10 is easily deformed starting from the plurality of triangular recesses 30, and the entire ridge portion 13 can be displaced upward more reliably.

Furthermore, in the synthetic resin bottle 1 of the present embodiment, the same number of triangular recesses 30 as the dividing grooves 20 are provided on the peripheral edge portion 10 such that the apexes facing radially inward are aligned with the circumferential positions of the corresponding dividing grooves 20. Thus, each portion of the ridge portion 13 divided by the plurality of dividing grooves 20 deforms with a higher degree of freedom along with the peripheral edge portion 10 starting from the triangular concave portion 30 at any portion in the circumferential direction. By doing so, the entire protrusion 13 can be reliably displaced upward.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, six dividing grooves 20 are provided in the ridge portion 13, but the number is not limited to this, and various changes are possible. Further, the shape of the ridge portion 13 is not limited to the above, and can be variously changed.

Furthermore, in the above-described embodiment, the peripheral portion 10 is provided with a plurality of triangular recesses 30, but these triangular recesses 30 may not be provided. Further, even when a plurality of triangular recesses 30 are provided in the peripheral edge portion 10, the number thereof is not limited to the same number as that of the dividing grooves 20, and various changes are possible.

Further, the synthetic resin container is not limited to polyethylene terephthalate, and may be made of other synthetic resins.

1 Synthetic resin bottle 2 Mouth 3 Shoulder 4 Body 5 Bottom 6 Male screw 7 Circumferential groove 10 Peripheral edge 11 Heel wall 12 Plane 13 Ridge 13a Outer peripheral side 13b Inner peripheral side 13c Tip 14 Groove shape Recessed portion 15 Depressed recessed portion 16 Reinforcing rib 20 Division groove 20a Side surface 20b Bottom surface 30 Triangular recessed portion O Axis

Claims (5)

It has a mouth portion for pouring out the contents, a shoulder portion integrally connected to the mouth portion, a body portion integrally connected to the shoulder portion, and a bottom portion integrally connected to the body portion. A synthetic resin bottle that is configured to exhibit a pressure reduction absorption function by being displaced inward of the body,
the bottom portion
an annular periphery;
It is provided radially inward from the peripheral edge portion, protrudes downward from the peripheral edge portion and functions as a grounding portion of the synthetic resin bottle, while extending toward the inside of the body portion as the pressure inside the synthetic resin bottle is reduced. an annular protrusion that is displaced to cause the peripheral portion to function as a grounding portion;
a recessed recess that is provided radially inward of the ridge and recesses toward the inside of the body;
A synthetic resin bottle, comprising: a plurality of dividing grooves provided in the ridge portion for dividing the ridge portion in a circumferential direction. 2. The synthetic resin bottle according to claim 1, wherein a plurality of said dividing grooves are provided in said ridge portion at equal intervals in the circumferential direction. 3. The synthetic resin bottle according to claim 1 or 2, wherein the ridge portion is provided with the dividing grooves of a multiple of 3. The synthetic resin bottle according to any one of claims 1 to 3, wherein the peripheral portion is provided with a plurality of substantially triangular concave portions tapered radially inward. 5. The synthetic resin product according to claim 4, wherein the same number of triangular recesses as the dividing grooves are provided on the peripheral edge portion so that the apexes facing radially inward are aligned with the circumferential positions of the corresponding dividing grooves. Bottle.

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