Synthetic resin container

Abstract

To provide a synthetic resin container capable of further reliably suppressing appearance defects caused by deformation of a body portion under reduced pressure.SOLUTION: A synthetic resin container 1 comprises a mouth portion 10, a body portion 30 connected to the mouth portion 10 via a shoulder portion 20, and a bottom portion 40 closing a lower end of the body portion 30. The body portion 30 has an upper end portion 31 with a circular lateral cross-sectional shape centered on an axis O, a lower end portion 32 with a circular lateral cross-sectional shape centered on the axis O, and an intermediate portion 33, provided between the upper end portion 31 and the lower end portion 32, which has a polygonal lateral cross-sectional shape with apexes of 6 to 12 inclined ridgelines 33a extending spirally at a twist angle of 30° or greater and 90° or smaller around the axis O. The synthetic resin container 1 has a shape that satisfies W / H of 0.20 to 0.35, where W is a width of the maximum diameter portion of the body portion and H is a height from the ground to a boundary between the shoulder portion and the body portion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a synthetic resin container having a cylindrical mouth portion, a body portion connected to the mouth portion via a shoulder portion, and a bottom portion closing the lower end of the body portion.

Background Art

[0002] Synthetic resin containers typified by bottles made of polypropylene (PP) or polyethylene terephthalate (PET) are lightweight, easy to handle, excellent in the storage stability of contents, and inexpensive in terms of cost. Therefore, they are used in various applications such as for beverages, foods, cosmetics, etc.

[0003] After such a synthetic resin container is filled with contents and the mouth portion is closed with a cap, it will be distributed in the market. However, for example, in summer, if the distribution and storage are carried out in a high-temperature environment (air temperature 40°C to 50°C), when used in a cooled state, the inside of the container may be depressurized, and the body portion may be deformed into a distorted shape, resulting in poor appearance.

[0004] Therefore, a synthetic resin container has been developed in which the body portion has a polygonal shape with a plurality of inclined ridges extending spirally as vertices, so as to absorb the decompression inside the container due to the torsional deformation of the body portion and reduce the poor appearance (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, even in the above conventional synthetic resin containers, the decompression absorption due to the torsional deformation of the body portion is not sufficient, and a more improved synthetic resin container is required.

[0007] This invention has been made in view of these problems, and its objective is to provide a synthetic resin container that can more reliably suppress defects in appearance caused by depressurization of the body. [Means for solving the problem]

[0008] The synthetic resin container of the present invention comprises a cylindrical mouth, a body connected to the mouth via a shoulder, and a bottom closing the lower end of the body, wherein the body has an upper end with a circular cross-sectional shape centered on an axis, a lower end with a circular cross-sectional shape centered on the axis, and a cross-sectional shape provided between the upper and lower ends, with 6 to 12 inclined ridges extending spirally at a twist angle of 30° to 90° around the axis as its apex. Positive The shape is characterized by having a polygonal intermediate portion, and having a shape in which W / H is 0.20 to 0.35 when W is the width of the part with the largest diameter in the torso and H is the height from the ground to the boundary between the shoulder portion and the torso.

[0009] In the synthetic resin container of the present invention, it is preferable that the body portion has a shape in which the width gradually decreases from the upper end to the lower end.

[0010] In the synthetic resin container of the present invention, the inclined ridge line is, It extends continuously from the upper end to the lower end, It is preferable that the circumferential width is maximum at the central portion between the upper and lower ends, and that the circumferential width gradually decreases from the central portion toward the upper and lower ends.

[0011] In the above configuration, the synthetic resin container of the present invention is preferably a liquid blow molded product. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a synthetic resin container that can more reliably suppress appearance defects caused by deformation of the body under reduced pressure. [Brief explanation of the drawing]

[0013] [Figure 1] This is a front view of a synthetic resin container according to one embodiment of the present invention. [Figure 2] Figure 1 is a bottom view of the synthetic resin container shown. [Figure 3] This is a cross-sectional view along line AA in Figure 1. [Modes for carrying out the invention]

[0014] The present invention will be described more specifically below with reference to the drawings.

[0015] The synthetic resin container 1 according to one embodiment of the present invention, shown in Figures 1 and 2, is used for purposes such as storing beverages, seasonings, detergents, cosmetics, etc.

[0016] The synthetic resin container 1 can be made of, for example, polypropylene (PP) or polyethylene terephthalate (PET), but may also be made of other synthetic resins.

[0017] The synthetic resin container 1 has a bottle shape comprising a mouth portion 10, a shoulder portion 20 connected to the lower end of the mouth portion 10, a body portion 30 connected to the mouth portion 10 via the shoulder portion 20, and a bottom portion 40 that closes the lower end of the body portion 30. The symbol O indicates the common axis of the mouth portion 10, the shoulder portion 20, the body portion 30, and the bottom portion 40.

[0018] In this specification and in the claims, the vertical direction means the vertical direction (the direction in which the axis O extends) when the synthetic resin container 1 is in an upright position as shown in Figure 1, and the radial direction means the direction that passes through the axis O of the synthetic resin container 1 and is perpendicular to the axis O.

[0019] The opening portion 10 is substantially cylindrical with axis O as its center, and a male screw 11 for attaching a closing member such as a cap is integrally provided on its outer surface. A neck ring 12 is also integrally provided below the male screw 11 of the opening portion 10.

[0020] If the mouth portion 10 is cylindrical, it is not limited to a circular cylinder, and may be, for example, a square cylinder, an elliptical cylinder, or the like. Further, instead of the male thread 11, a protrusion for undercut engaging a closing member such as a cap by caulking may be provided on the outer peripheral surface of the mouth portion 10. Further, the mouth portion 10 may be configured without the neck ring 12.

[0021] The shoulder portion 20 has a substantially dome shape convex toward the outside of the container and is integrally connected to the lower end of the mouth portion 10. The shape of the cross section perpendicular to the axis O at the lower end of the shoulder portion 20, that is, the cross-sectional shape, is circular.

[0022] The shape of the shoulder portion 20 is not limited to a substantially dome shape, and can be variously changed, for example, an umbrella shape that inclines linearly.

[0023] The body portion 30 has a cylindrical shape extending along the axis O as a whole, and has an upper end portion 31, a lower end portion 32, and an intermediate portion 33 provided between the upper end portion 31 and the lower end portion 32.

[0024] The upper end portion 31 is a portion constituting the upper end of the body portion 30. The upper end portion 31 has a circular cross-sectional shape perpendicular to the axis O, that is, a cross-sectional shape centered on the axis O, and is integrally connected to the lower end of the shoulder portion 20.

[0025] The lower end portion 32 is a portion constituting the lower end of the body portion 30, and has a circular cross-sectional shape perpendicular to the axis O, that is, a cross-sectional shape centered on the axis O.

[0026] As shown in FIG. 2, in the present embodiment, the outer diameter centered on the axis O of the upper end portion 31 is larger than the outer diameter centered on the axis O of the lower end portion 32. Thereby, the body portion 30 has a shape in which the width gradually decreases from the upper end portion 31 toward the lower end portion 32.

[0027] The intermediate section 33 has 6 to 12 inclined ridges 33a that extend spirally from the upper end 31 to the lower end 32, each with a twist angle of 30° or more and 90° or less around the axis O. As shown in Figure 3, due to the presence of multiple inclined ridges 33a, the cross-sectional shape of the intermediate section 33 perpendicular to the axis O, i.e., the transverse shape, is a polygonal shape with the inclined ridges 33a as vertices.

[0028] In this embodiment, the intermediate section 33 has eight inclined ridges 33a that extend spirally at a twist angle of 45° around the axis O. Each of the inclined ridges 33a is arranged at equal intervals in the circumferential direction around the axis O. As a result, in this embodiment, the cross-sectional shape of the intermediate section 33 is a regular octagon with the eight inclined ridges 33a as its vertices.

[0029] The "torsion angle" is the angle formed by the line connecting the axis O and the upper end of the inclined ridge 33a, and the line connecting the axis O and the lower end of the inclined ridge 33a, when viewed from the direction along the axis O.

[0030] In this embodiment, each inclined ridge 33a has a shape in which the circumferential width, i.e., the width in the circumferential direction, is maximum at the central part (the central part in the vertical direction) between the upper end 31 and the lower end 32, and the circumferential width gradually decreases from this central part toward the upper end 31 and the lower end 32.

[0031] Furthermore, in this embodiment, the radially outward-facing tip portion of each inclined ridge 33a is curved with a radius smaller than that of a virtual circle C passing through the radially outward-facing vertices of the eight inclined ridges 33a with the axis O as the center in a cross-section perpendicular to the axis O, and the radially outward-facing tip portion is chamfered. The chamfered portion has a circumferential width corresponding to the circumferential width of the inclined ridge 33a. Preferably, the circumferential width of the chamfered portion of the inclined ridge 33a is 1 mm or less at the central portion between the upper end 31 and the lower end 32 where the circumferential width of the inclined ridge 33a is maximum, and in this embodiment it is 0.6 mm. It is preferable that the chamfered tip portion of the inclined ridge 33a is flat or curved, convexly curving radially outward.

[0032] The portions of the intermediate section 33 between adjacent inclined ridges 33a each form a panel section 33b. The cross-sectional shape of these panel sections 33b is a curved shape that curves convexly outward in the radial direction with a radius larger than that of the virtual circle C, but it may also be a flat shape.

[0033] The intermediate section 33 has a shape in which the overall width decreases from the top to the bottom, such that a virtual circle C passing through the radially outward-facing vertices of the eight inclined ridges 33a, centered on the axis O, has the same diameter as the upper end 31 at the upper end of the inclined ridges 33a, and gradually decreases in diameter from the top to the bottom, becoming the same diameter as the lower end 32 at the bottom.

[0034] As shown in Figure 1, the torso 30 having the above configuration has a vertically elongated shape where, when the radial dimension of the upper end portion 31, which is the part with the largest diameter in the torso 30 (the widest part in a side view), is W, and the dimension in the direction along the axis O from the ground to the boundary between the shoulder portion 20 and the torso 30, i.e., the height, is H, the W / H ratio satisfies 0.20 to 0.35. In this embodiment, the width W of the torso 30 is 39.5 mm, the height H is 141.0 mm, and the W / H ratio is 0.28.

[0035] The capacity of the synthetic resin container 1 is preferably 120 ml to 200 ml.

[0036] The bottom portion 40 has an annular grounding portion 41 and a recess 42 provided radially inward of the grounding portion 41, and is integrally attached to the lower end portion 32 of the body portion 30, closing the lower end of the body portion 30. The lower end of the grounding portion 41 is the reference ground for height H.

[0037] The synthetic resin container 1 of this embodiment is a liquid blow-molded product. That is, the synthetic resin container 1 is formed by blow-molding a synthetic resin preform, for example, which is formed in the shape of a bottomed cylindrical shape, using a liquid as the pressurizing medium. In this case, by using the liquid that will ultimately be filled into the synthetic resin container 1 as the pressurizing medium, blow molding and filling can be performed simultaneously, making it easy to form a liquid-filled synthetic resin container 1.

[0038] Furthermore, the synthetic resin container 1 is not limited to liquid blow molding; it can also be formed by various other methods, such as air blow molding using air as a pressurizing medium, or extrusion blow molding (EBM) using a cylindrical parison made of synthetic resin. In these cases, after the synthetic resin container 1 is formed, the contents are filled inside.

[0039] In the synthetic resin container 1 of this embodiment, having the above configuration, when the contents are filled and the opening 10 is closed with a closing member such as a cap, if the inside of the container becomes depressurized, the body portion 30 or intermediate portion 33 twists in a direction that increases the twisting angle of the multiple inclined ridges 33a or panel portion 33b, thereby absorbing the depressurization. This prevents the body portion 30 from deforming into a distorted shape due to depressurization and prevents localized dents from occurring. Thus, with the synthetic resin container 1 of this embodiment, even if the inside of the container becomes depressurized, it is possible to prevent the body portion 30 from becoming deformed due to depressurization and preventing cosmetic defects.

[0040] In this embodiment, the synthetic resin container 1 has a vertically elongated shape, with a W / H relationship between the width W and height H of the body 30 being 0.20 to 0.35. Furthermore, the intermediate portion 33 provided between the upper end 31 and lower end 32 of the body 30 has a polygonal shape with a cross-sectional shape having 6 to 12 inclined ridges 33a as vertices, extending spirally with a twist angle of 30° to 90° around the axis O. Compared to the case where the body 30 is formed in a normal cylindrical shape, this makes it possible to more reliably suppress irregular deformation of the body 30 due to pressure deformation without significantly reducing the contents volume of the synthetic resin container 1.

[0041] If the number of inclined ridges 33a provided in the intermediate section 33 is less than six, the internal volume of the synthetic resin container 1 cannot be sufficiently secured when the body section 30 is formed in a cylindrical shape, resulting in insufficient internal volume. Conversely, if the number of inclined ridges 33a provided in the intermediate section 33 is greater than twelve, the strength of the intermediate section 33 becomes too high, and it may not be able to sufficiently absorb the pressure reduction due to torsional deformation, potentially causing cosmetic defects in the body section 30 due to pressure deformation.

[0042] Furthermore, in this embodiment, since the multiple panel portions 33b are curved in a convex shape that curves radially outward in the cross-section, a sufficient volume of contents can be secured in the synthetic resin container 1.

[0043] Furthermore, in this embodiment, the multiple inclined ridges 33a are shaped such that their circumferential width is maximum in the central portion between the upper end 31 and the lower end 32, and gradually decreases from the central portion toward the upper end 31 and the lower end 32. This prevents the inclined ridges 33a from undergoing plastic deformation such as becoming concave due to external forces.

[0044] Furthermore, in this embodiment, the body portion 30 is shaped so that its width gradually decreases from the upper end portion 31 to the lower end portion 32. This makes it easier to insert the synthetic resin container 1 into the outer container (not shown) from the upper end opening of the outer container when using the synthetic resin container 1 by inserting it into the outer container, and also reduces rattling of the synthetic resin container 1 relative to the outer container.

[0045] Furthermore, in this embodiment, since the synthetic resin container 1 is a liquid blow molded product formed by liquid blow molding, the formability during blow molding is improved compared to when it is formed by air blow molding, and the dimensional accuracy of the synthetic resin container 1 with the above configuration can be improved. As a result, each part of the synthetic resin container 1 reliably exhibits the above effect, and while ensuring the capacity of the synthetic resin container 1, it is possible to more effectively suppress the occurrence of appearance defects in the body portion 30 due to pressure deformation.

[0046] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the invention.

[0047] For example, in the above embodiment, the body portion 30 is shaped so that its width gradually decreases from the upper end portion 31 to the lower end portion 32, but it is not limited to this, and it may be shaped so that its width is constant from the upper end portion 31 to the lower end portion 32.

[0048] Furthermore, in the above embodiment, the multiple inclined ridges 33a are shaped such that their circumferential width is maximum at the central portion between the upper end 31 and the lower end 32, and gradually decreases from the central portion toward the upper end 31 and the lower end 32. However, the embodiment is not limited to this, and the circumferential width may be constant from the upper end to the lower end. Moreover, the multiple inclined ridges 33a may be configured without chamfered portions at the tips facing radially outward. [Explanation of Symbols]

[0049] 1. Container made of synthetic resin 10 Mouth 11 Male screw 12 Neck Rings 20 Shoulder 30 Torso 31 Upper end 32 Lower end 33 Middle section 33a Sloping ridgeline 33b Panel section 40 bottom 41 Grounding part 42 recess O axis C Virtual Yen W Full width H Total height

Claims

1. A synthetic resin container comprising a cylindrical opening, a body connected to the opening via a shoulder portion, and a bottom portion that closes the lower end of the body, The aforementioned torso portion, The cross-sectional shape is a circular upper end centered on the axis, The cross-sectional shape is a circular lower end centered on the aforementioned axis, It has an intermediate portion provided between the upper end and the lower end, the intermediate portion having a regular polygonal shape with a cross-sectional shape having 6 to 12 inclined ridges as vertices that extend spirally with a twist angle of 30° or more and 90° or less around the axis, A synthetic resin container characterized in that, when W is the width of the part with the largest diameter in the body and H is the height from the ground to the boundary between the shoulder and the body, the W / H ratio satisfies 0.20 to 0.

35.

2. The synthetic resin container according to claim 1, wherein the body portion has a shape in which the width gradually decreases from the upper end to the lower end.

3. The synthetic resin container according to claim 1 or 2, wherein the inclined ridge extends continuously from the upper end to the lower end, and its circumferential width is maximized in the central portion between the upper end and the lower end, and the circumferential width gradually decreases from the central portion toward the upper end and the lower end.

4. A synthetic resin container according to any one of claims 1 to 3, which is a liquid blow molded product.

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