JP6942417B2 - Synthetic resin container - Google Patents

Description

The present invention relates to a bottle-shaped synthetic resin container, and more particularly to a container having a constricted portion on the body portion.

As a container for storing liquids such as soft drinks such as tea and seasonings such as water, liquor, and soy sauce as contents, it is inexpensive and easy to transport, dispose, and recycle. Therefore, for example, it is made of polyethylene terephthalate. Bottle-shaped synthetic resin containers such as bottles (PET bottles) and bottles made of stretched polypropylene (OPP) are often used.

In such a bottle-shaped synthetic resin container, in order to make the container easy to hold by hand or to enhance the appearance, a constricted portion is provided on the body so that the outer diameter is reduced. There are some (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2007-76717

However, in a bottle-shaped synthetic resin container having a constricted portion on the body, if a decompression absorption panel or a movable bottom is not provided, the contents generated as the high-temperature filled contents are cooled. Due to the influence of volume change and volume change of the contents caused by the permeation of water to the outside during storage, the constricted part is easily deformed under reduced pressure in an elliptical shape, and the deformation deteriorates the appearance of the synthetic resin container. There was a problem that there was a risk that it would end up.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a synthetic resin container capable of suppressing deformation of a constricted portion caused by a change in the volume of contents after filling. To do.

The synthetic resin container of the present invention includes a mouth portion, a cylindrical body portion connected to the mouth portion via a shoulder portion, and a bottom portion that closes the lower end of the body portion, and the body portion has a constricted portion. A bottle-shaped synthetic resin container provided, in which 6 × n (natural numbers of n = 4 to 8) vertical ribs are provided in the constricted portion at equal intervals in the circumferential direction, and the vertical ribs are provided. Is lower in the radial outward protrusion height with respect to the axial center of the body than the n first vertical ribs arranged at equal intervals in the circumferential direction and the first vertical ribs, respectively. It is characterized by being formed and composed of 5n other vertical ribs arranged side by side between the first vertical ribs adjacent to each other.

Synthetic resin container of the present invention having the above structure, a cross-sectional shape of the vertex facing radially outward of each of the longitudinal ribs arcuate arcuate vertex facing radially outward of the first longitudinal rib It is preferable that the radius in the cross-sectional shape of the above-mentioned vertical rib is larger than the radius in the arc-shaped cross-sectional shape of the apex facing outward in the radial direction of the other vertical rib.

In the synthetic resin container of the present invention, in the above configuration, the other vertical ribs are the 2n second vertical ribs arranged adjacent to both sides of the first vertical ribs in the circumferential direction, and the first vertical ribs, respectively. The protrusion height in the radial direction with respect to the axial center of the body is formed lower than that of the two vertical ribs, and three 3nth ribs are arranged side by side between the adjacent second vertical ribs. It is preferably composed of three vertical ribs.

Synthetic resin container of the present invention having the above structure, a cross-sectional shape of the vertex facing radially outward of each of the longitudinal ribs arcuate arcuate vertex facing radially outward of the first longitudinal rib radius in the cross-sectional shape, larger than the radius of the arcuate cross-sectional shape of the vertex facing radially outward of the second longitudinal ribs, transverse arcuate vertex facing radially outward of the second longitudinal rib It is preferable that the radius in the surface shape is larger than the diameter in the arcuate cross-sectional shape of the apex facing outward in the radial direction of the third vertical rib.

In the above configuration, the synthetic resin container of the present invention has a configuration in which the outer diameter of the constricted portion at the end of the mouth portion is smaller than the outer diameter of the constricted portion at the end of the bottom portion. be able to.

In the above configuration, the synthetic resin container of the present invention preferably has 36 vertical ribs provided in the constricted portion.

In the above configuration, the synthetic resin container of the present invention preferably has an annular and concave horizontal rib located on the side of the mouth portion of the constricted portion with respect to the vertical rib.

The synthetic resin container of the present invention can be a blow bottle made of polyethylene terephthalate in the above configuration.

According to the present invention, it is possible to provide a synthetic resin container capable of suppressing deformation of a constricted portion caused by a change in the volume of the contents after filling.

It is a front view of the container made of synthetic resin in one Embodiment of this invention. It is sectional drawing which follows the AA line in FIG. FIG. 3 is an enlarged cross-sectional view showing a part of the synthetic resin container shown in FIG. 2. It is a figure which shows the measurement position of the synthetic resin container of an Example and a comparative example.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The synthetic resin container 1 according to the embodiment of the present invention shown in FIG. 1 can be used for storing a liquid such as a soft drink such as tea, a seasoning liquid such as water, liquor, and soy sauce as a content. It can be done.

The synthetic resin container 1 has a bottle shape including a mouth portion 2, a body portion 4 connected to the mouth portion 2 via a shoulder portion 3, and a bottom portion 5 connected to the lower end of the body portion 4.

In the present embodiment, the synthetic resin container 1 is a polyethylene terephthalate blow bottle (PET bottle) formed by biaxially stretching blow molding a preform formed by injection molding polyethylene terephthalate (PET). be.

The synthetic resin container 1 weighs 24 g, has a height of 175 mm, and has a full filling capacity of 362 ml.

The mouth portion 2 is formed in a cylindrical shape, and a male screw 2a and a neck ring 2b are integrally provided on the outer peripheral surface. The mouth portion 2 can be sealed by screwing a cap (not shown) to the male screw 2a. In addition, it is also possible to provide an annular protrusion on the outer peripheral surface of the mouth portion 2 and attach the cap to the mouth portion 2 by tapping.

The body 4 is formed in a cylindrical shape, the lower end thereof is closed by the bottom 5, and the inside is a space for accommodating the contents. The bottom portion 5 is provided with a recess 5a that is recessed toward the side of the accommodation space.

The body portion 4 is provided with a constricted portion 4a. In the present embodiment, the constricted portion 4a is provided in a range of about two-thirds on the side of the bottom portion 5 of the body portion 4. A concave partition rib 4c extending in the circumferential direction is provided between the constricted portion 4a of the body portion 4 and the shoulder portion 3, and the upper portion 4b of the body portion 4 is provided between the partition rib 4c and the shoulder portion 3. ing. In the present embodiment, the upper portion 4b of the body portion 4 is formed in a cylindrical shape having a constant outer diameter, but it can also have a constricted shape. Further, the partition rib 4c may not be provided.

The constricted portion 4a is formed between the upper end portion (the end portion on the side of the mouth portion 2) 4a1 and the lower end portion (the end portion on the side of the bottom portion 5) 4a2, and the upper end portion 4a1 and the lower end portion thereof. It has a curvedly reduced diameter so as to have a portion having an outer diameter smaller than that of 4a2.

Further, in the present embodiment, the constricted portion 4a has a substantially divergent shape in which the outer diameter at the upper end portion 4a1 is smaller than the outer diameter at the lower end portion 4a2.

The constricted portion 4a of the body portion 4 is provided with 6 × n (natural numbers of n = 4 to 8) vertical ribs 10 arranged at equal intervals in the circumferential direction. The vertical ribs 10 include three types of vertical ribs 11, an n first vertical ribs 11, 5n other vertical ribs, 2n second vertical ribs 12, and 3n third vertical ribs 13. It consists of 12 and 13. As shown in FIG. 2, in the present embodiment, n = 6, and 6 first vertical ribs 11, 12 second vertical ribs 12 and 18 are formed in the constricted portion 4a of the body portion 4. 36 vertical ribs 10 composed of the third vertical ribs 13 are provided so as to be arranged at equal intervals in the circumferential direction.

In FIG. 1, for convenience, reference numerals 10 of vertical ribs including all of the first vertical ribs 11, the second vertical ribs 12, and the third vertical ribs 13 are attached to only one vertical rib, and reference numerals 11 and 12, The description of 13 is omitted. Further, in FIGS. 2 and 3, the first vertical rib 11, the second vertical rib 12, and the third vertical rib 13 are designated by reference numerals, and only one reference numeral 10 indicating the entire vertical rib is described.

As shown in FIGS. 2 and 3, the six first vertical ribs 11 are arranged at equal intervals in the circumferential direction so as to be displaced from each other by 60 ° in the circumferential direction. The twelve second vertical ribs 12 are arranged adjacent to each of the first vertical ribs 11 on both sides in the circumferential direction. That is, the second vertical ribs 12 are arranged on both sides of all the first vertical ribs 11 in the circumferential direction with a deviation of 10 ° in the circumferential direction with respect to the first vertical ribs 11, respectively. The 18 third vertical ribs 13 are arranged three by three (three consecutively arranged) between the adjacent second vertical ribs 12 (between the sides opposite to the side where the first vertical ribs 11 are sandwiched). Have been placed.

That is, the 36 vertical ribs 10 are adjacent to one first vertical rib 11, one second vertical rib 12 adjacent to the first rib 11, and three adjacent to the second vertical rib 12. The three vertical ribs 13 and the six vertical ribs 10 of the second vertical ribs 12 adjacent to the third vertical ribs 13 are set as one set, and the sets are arranged side by side in the circumferential direction.

All the vertical ribs 10, that is, the six first vertical ribs 11, the twelve second vertical ribs 12, and the eighteen third vertical ribs 13 are convex ribs protruding outward in the radial direction, respectively. The cross-sectional shape of the apex facing outward in the radial direction is arcuate. Further, the portion between the vertices of the adjacent vertical ribs 10 has a concavely curved shape.

As shown in FIG. 3, the radial outward protrusion height of the second vertical rib 12 is lower than the radial outward protrusion height of the first vertical rib 11. That is, the radius R2, which is the radial distance from the axial center O of the body portion 4 to the apex of the second vertical rib 12, is the radial distance from the axial center O of the body portion 4 to the apex of the first vertical rib 11. It is smaller than the radius R1. Further, the radial outward protrusion height of the third vertical rib 13 is lower than the radial outward protrusion height of the second vertical rib 12. That is, the radius R3, which is the radial distance from the axial center O of the body portion 4 to the apex of the third vertical rib 13, is smaller than the radius R1 of the second vertical rib 12. As described above, the three types of vertical ribs 11, 12, and 13 constituting the vertical rib 10 have different radial outward protrusion heights from each other.

In the present embodiment, the radius R1 from the axis O of the first vertical rib 11 to the apex is 27.55 mm, the radius R2 from the axis O of the second vertical rib 12 to the apex is 27.35 mm, and the third vertical rib 12. The radius R3 from the axis O of the rib 13 to the apex is 27.15 mm.

Further, the radius (rib diameter) of the arc-shaped apex of the first vertical rib 11 is larger than the radius of the arc-shaped apex of the second vertical rib 12, and the arc-shaped apex of the second vertical rib 12 is formed. The radius of the apex is larger than the radius of the arc-shaped apex of the third vertical rib 13. That is, the three types of vertical ribs 11, 12, and 13 constituting the vertical rib 10 have different apex radii from each other.

The constricted portion 4a of the body portion 4 is provided with a horizontal rib 20 located closer to the mouth portion 2 than the vertical rib 10. The lateral rib 20 is formed as a concave rib having an annular shape extending over the entire circumference of the body portion 4 and having a concave cross section.

As described above, in the synthetic resin container 1 of the present embodiment, in the bottle-shaped synthetic resin container 1 in which the constricted portion 4a is provided in the body portion 4, 6 × n is formed in the constricted portion 4a of the body portion 4. Vertical ribs 10 of books (n = 4 to 8 natural numbers) are provided at equal intervals in the circumferential direction, and n first vertical ribs 11 are arranged at equal intervals in the circumferential direction. And 2n second vertical ribs 12 which are formed so as to have a lower protrusion height in the radial direction than the first vertical ribs 11 and are arranged adjacent to both sides in the circumferential direction of each of the first vertical ribs 11. , Each of the 3n third vertical ribs 13 formed so as to have a lower protrusion height in the radial direction than the second vertical ribs 12 and arranged three by three between the adjacent second vertical ribs 12. It has a structure of. According to the synthetic resin container 1 of the present embodiment having such a configuration, the rigidity of the constricted portion 4a can be increased by the vertical ribs 10, and for example, the contents are filled in the synthetic resin container 1 at a high temperature. Then, after sealing the mouth 2 with a cap, the volume of the contents changes so as to decrease as the contents are cooled, or the moisture of the contents permeates to the outside during storage and the contents. Even when the inside of the synthetic resin container 1 is depressurized by changing the volume so as to decrease, the deformation of the constricted portion 4a due to the depressurization can be suppressed or alleviated.

Further, as in the synthetic resin container 1 of the present embodiment, six first vertical ribs 11 and twelve second vertical ribs 12 and 18 are provided in the constricted portion 4a of the body portion 4 with the above configuration or arrangement. When 36 vertical ribs 10 composed of the third vertical rib 13 of the book are provided, when the inside of the synthetic resin container 1 is depressurized, the constricted portion 4a is suppressed from being deformed due to the decompression, and the constricted portion 4a is suppressed. The deformation can be made inconspicuous from the outside by deforming 4a so as to have a substantially regular triangular cross-sectional shape with the three first vertical ribs 11 as the apex instead of the elliptical cross-sectional shape. .. Therefore, it is possible to suppress the deterioration of the aesthetic appearance of the synthetic resin container 1 due to the deformation of the constricted portion 4a due to the reduced pressure.

Further, in the present embodiment, the radius of the arc-shaped apex of the first vertical rib 11 is made larger than the radius of the arc-shaped apex of the second vertical rib 12, and the arc-shaped apex of the second vertical rib 12 is formed. Since the radius of the apex is made larger than the radius of the arc-shaped apex of the third vertical rib 13, when the inside of the synthetic resin container 1 is depressurized, the constricted portion 4a is a substantially regular triangle as described above. The deformation can be easily deformed so as to have a cross-sectional shape of the shape, and the deformation can be made more inconspicuous from the outside.

Further, in the present embodiment, the synthetic resin container 1 has a substantially divergent shape in which the constricted portion 4a of the body portion 4 has an outer diameter at the upper end portion 4a1 smaller than the outer diameter at the lower end portion 4a2. The constricted portion 4a having such a shape is easily deformed into an elliptical cross-sectional shape when the inside of the synthetic resin container 1 is depressurized. By providing the vertical rib 10 having the above-described configuration in the constricted portion 4a of the portion 4, it is possible to effectively suppress or alleviate the deformation of the constricted portion 4a when the inside of the synthetic resin container 1 is depressurized.

Further, in the present embodiment, the constricted portion 4a of the body portion 4 is provided with the horizontal rib 20 located closer to the mouth portion 2 than the vertical rib 10, so that the rigidity of the constricted portion 4a of the body portion 4 is provided. Can be further increased to more effectively suppress or alleviate the deformation of the constricted portion 4a.

In order to confirm the effect of the present invention, the synthetic resin containers of Examples 1 and 2 and the synthetic resin containers of Comparative Examples 1 and 2 were prepared, and these synthetic resin containers were constricted by internal decompression. A test was conducted to confirm the presence or absence of deformation of.

The synthetic resin container of Example 1 has the same structure as the synthetic resin container 1 shown on the left side of FIG. 4, and weighs 24 g. The synthetic resin container of Example 2 has the same structure as the synthetic resin container 1 and weighs 28 g. As shown on the right side of FIG. 4, the synthetic resin container of Comparative Example 1 is provided with a mouth portion 102, a shoulder portion 103, a body portion 104, and a bottom portion 105, and is provided on the body portion 104, similarly to the synthetic resin container 1. It is a bottle-shaped container provided with a constricted portion 104a, but is a synthetic resin container 100 provided with only a partition rib 104c on the body portion 104 and not provided with vertical ribs and horizontal ribs, and weighs 24 g. belongs to. The synthetic resin container of Comparative Example 2 has the same structure as the synthetic resin container 100 and weighs 28 g. Each synthetic resin container has a height of 175 mm and a full filling capacity of 362 ml.

To evaluate the presence or absence of deformation of the constricted portions 4a and 104a, each synthetic resin container is filled with the contents heated to 40 ° C., the mouths 2 and 102 are sealed with a cap, and then the contents are brought to room temperature ( When the contents are cooled to 5 ° C. and when the contents are cooled to 5 ° C., the positions where the outer diameters of the constricted portions 4a and 104a shown by the line segment L in FIG. 4 are minimized (from the bottoms 5 and 105). The maximum value of the outer diameters of the constricted portions 4a and 104a at the position where the height is 70 mm) is measured, and the difference between the measured value and the outer diameters of the constricted portions 4a and 104a in the empty synthetic resin container is calculated. By comparison, when the diameter difference was 3 mm or less, it was evaluated as no deformation, and when the diameter difference was larger than 3 mm, it was evaluated as having deformation. The test results are shown in Table 1. The measurement is performed at the position where the outer diameters of the constricted portions 4a and 104a are minimized because the amount of deformation due to decompression is the largest in the portion.

Table 1 shows the difference between the average value of the outer diameters of the constricted portions 4a and 104a of the synthetic resin container and the outer diameters of the constricted portions 4a and 104a of the empty synthetic resin container with reference to.

As shown in Table 1, in the synthetic resin containers of Examples 1 and 2 in which the vertical rib 10 having the above configuration is provided in the constricted portion 4a of the body portion 4, the outer diameter of the constricted portion 4a of the body portion 4 in the filled product is used. The diameter difference with respect to the empty state (the above state) was small, and the evaluation of the presence or absence of deformation was "none". Further, the constricted portion 4a of the body portion 4 has a Δ shape, that is, three first vertical ribs arranged every other in the circumferential direction among the six first vertical ribs having the highest protrusion height in the radial direction are the vertices. Then, the other three first vertical ribs between the three first vertical ribs that are the vertices are deformed so as to have a substantially regular triangular cross-sectional shape located at the center of each of the three sides. , The deformation was inconspicuous in appearance. Further, the synthetic resin container of Example 1 having a lighter weight was less deformed than the synthetic resin container of Example 2 having a heavier weight.

On the other hand, in the synthetic resin containers of Comparative Examples 1 and 2 in which the vertical ribs are not provided in the constricted portion 104a of the body portion 104, the outer diameter of the constricted portion 104a of the body portion 104 in the filled product is empty (the above state). The difference in diameter was large, and the evaluation of the presence or absence of deformation was "yes". Further, the constricted portion 104a of the body portion 104 was deformed in an elliptical shape, and the deformation was conspicuous in appearance.

As described above, based on the above test results, in the bottle-shaped synthetic resin container 1 in which the constricted portion 4a is provided in the body portion 4, the contents are filled by providing the vertical rib 10 having the above configuration in the constricted portion 4a. It was confirmed that the appearance of the synthetic resin container 1 can be maintained by suppressing the deformation of the constricted portion 4a caused by the change in the volume of the contents later.

It goes without saying that the present invention is not limited to the above-described embodiment and can be variously modified without departing from the gist thereof.

For example, in the above-described embodiment, as other vertical ribs arranged between the adjacent first vertical ribs 11, two second vertical ribs 12 and 3 having different radial outward protrusion heights from each other. Although the third vertical rib 13 of the book is provided, as other vertical ribs arranged between the adjacent first vertical ribs 11, five vertical ribs having the same radial outward protrusion height are provided. It is also possible to provide a rib. In this case, the radii of the vertices of the five vertical ribs arranged between the adjacent first vertical ribs 11 can be made the same as each other. Even with such a configuration, the rigidity of the constricted portion 4a can be increased by the vertical rib 10, and for example, the contents are filled inside the synthetic resin container 1 at a high temperature, the mouth portion 2 is sealed with a cap, and then the contents. Made of synthetic resin by changing so that the volume of the contents decreases as the contents are cooled, or by changing so that the moisture of the contents permeates to the outside and the volume of the contents decreases during storage. Even when the inside of the container 1 is depressurized, the deformation of the constricted portion 4a due to the depressurization can be suppressed or alleviated.

Further, in the above-described embodiment, 36 vertical ribs 11 including 6 first vertical ribs 11, 12 second vertical ribs 12 and 18 third vertical ribs 13 are formed in the constricted portion 4a of the body portion 4. The ribs 10 are provided so as to be arranged at equal intervals in the circumferential direction, but the present invention is not limited to this, and four first vertical ribs 11 and eight second vertical ribs 12 and 12 are provided in the constricted portion 4a of the body portion 4. Twenty-four vertical ribs 10 composed of the third vertical ribs 13 of the book may be arranged at equal intervals in the circumferential direction, and five first vertical ribs 11 and 10 may be provided in the constricted portion 4a of the body portion 4. 30 vertical ribs 10 composed of the 2nd vertical ribs 12 and 15 3rd vertical ribs 13 may be arranged at equal intervals in the circumferential direction, and 7 of them may be provided in the constricted portion 4a of the body portion 4. Forty-two vertical ribs 10 composed of a first vertical rib 11, 14 second vertical ribs 12 and 21 third vertical ribs 13 may be arranged at equal intervals in the circumferential direction, and the body portion 4 may be provided. A configuration in which 48 vertical ribs 10 composed of 8 first vertical ribs 11, 16 second vertical ribs 12 and 24 third vertical ribs 13 are arranged at equal intervals in the circumferential direction in the constricted portion 4a. May be. In any case, all the vertical ribs 10 are arranged side by side at equal intervals in the circumferential direction. If 48 or more vertical ribs 10 are provided in the constricted portion 4a of the body portion 4, the depth of the valley between the adjacent vertical ribs 10 becomes too shallow, and the deformation of the constricted portion 4a is sufficiently suppressed. It is not preferable because it cannot be done.

Further, in the above-described embodiment, one horizontal rib 20 is provided on the side of the mouth 2 with respect to the vertical rib 10 of the constricted portion 4a, but the present invention is not limited to this, and the horizontal rib 20 is not provided. May be. Further, another horizontal rib may be provided on the side of the mouth portion 2 or the side of the bottom portion 5 with respect to the vertical rib 10 of the constricted portion 4a.

Further, in the above-described embodiment, the constricted portion 4a of the body portion 4 has a substantially divergent shape in which the outer diameter of the upper end portion 4a1 is smaller than the outer diameter of the lower end portion 4a2, but the present invention is not limited to this. Even if the outer diameter of the upper end portion 4a1 and the outer diameter of the lower end portion 4a2 are equal to each other, or the outer diameter of the upper end portion 4a1 is larger than the outer diameter of the lower end portion 4a2, the shape is substantially narrowed. good.

Further, in the above-described embodiment, the synthetic resin container 1 is a blow bottle made of polyethylene terephthalate, but the present invention is not limited to this, and any other container such as polypropylene can be used as long as it is made of a synthetic resin material. It may be formed of a material. Further, the preform is not limited to the one produced by biaxial stretch blow molding, and may be formed by another method such as direct blow molding.

1 Synthetic resin container 2 Mouth 2a Male screw 2b Neck ring 3 Shoulder 4 Body 4a Constriction 4a1 Upper end 4a2 Lower end 4b Upper part 4c Section rib 5 Bottom 5a Recess 10 Vertical rib 11 First vertical rib 12 2nd vertical rib (other vertical rib)
13 Third vertical rib (other vertical rib)
20 Horizontal rib 100 Synthetic resin container 102 of comparative example Mouth 103 Shoulder 104 Body 104a Constriction 104c Section rib 105 Bottom O Body axis R1 Radius of first vertical rib R2 Radius of second vertical rib R3 No. 3 Vertical rib radius L line segment

Claims (8)

A bottle-shaped synthetic resin having a mouth portion, a cylindrical body portion connected to the mouth portion via a shoulder portion, and a bottom portion that closes the lower end of the body portion, and the body portion is provided with a constricted portion. It is a container made
6 × n (natural numbers of n = 4 to 8) vertical ribs are provided in the constricted portion at equal intervals in the circumferential direction.
The vertical rib
N first vertical ribs arranged at equal intervals in the circumferential direction,
Each of the 5n is formed so that the protruding height in the radial direction with respect to the axial center of the body portion is lower than that of the first vertical ribs, and five of them are arranged side by side between the adjacent first vertical ribs. A synthetic resin container characterized by consisting of other vertical ribs of a book. The cross-sectional shape of the apex of each of the vertical ribs facing outward in the radial direction is arcuate, and the radius of the arc-shaped cross-sectional shape of the apex of the first vertical rib facing outward in the radial direction is the radius of the other vertical rib. The synthetic resin container according to claim 1, which is larger than the radius in the arcuate cross-sectional shape of the apex facing outward in the radial direction of the above. The other vertical ribs
The 2n second vertical ribs arranged adjacent to each other on both sides in the circumferential direction of the first vertical ribs,
Each of the 3n is formed so that the protruding height in the radial direction with respect to the axial center of the body portion is lower than that of the second vertical ribs, and three of them are arranged side by side between the adjacent second vertical ribs. The synthetic resin container according to claim 1 or 2, which comprises a third vertical rib of a book. The cross-sectional shape of the apex of each of the vertical ribs facing outward in the radial direction is arcuate, and the radius in the arcuate cross-sectional shape of the apex of the apex facing outward in the radial direction of the first vertical rib is the radius of the second vertical rib. larger than the radius of the arcuate cross-sectional shape of the vertex facing the radially outer radius of the arcuate cross-sectional shape of the vertex facing radially outward of the second longitudinal rib, the diameter of the third longitudinal rib The synthetic resin container according to claim 3, which is larger than the diameter in the arcuate cross-sectional shape of the apex facing outward in the direction. The synthetic resin according to any one of claims 1 to 4, wherein the outer diameter of the constricted portion at the end of the mouth portion is smaller than the outer diameter of the constricted portion at the end of the bottom portion. Making container. The synthetic resin container according to any one of claims 1 to 5, wherein the constricted portion is provided with 36 vertical ribs. The synthetic resin container according to any one of claims 1 to 6, wherein the constricted portion is provided with an annular and concave horizontal rib located closer to the mouth portion than the vertical rib. The synthetic resin container according to any one of claims 1 to 7, which is a blow bottle made of polyethylene terephthalate.

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