JP2021054485A - Synthetic resin container - Google Patents

Abstract

To provide a synthetic resin container having a decompression absorbing panel on a shoulder part with excellent strength.SOLUTION: A synthetic resin container 1 includes a cylindrical mouth part 2, a shoulder part 3 whose diameter expands downward from the mouth part 2, a trunk part 4 connected to the lower end of the shoulder part 3, and a bottom part 5 that closes the lower end of the trunk part 4. The shoulder part 3 has a plurality of decompression absorbing panels 6 that widen downward and are arranged in a circumferential direction. Each decompression absorbing panel 6 has a reinforcing groove 14 which is made of an upper groove 12 extending along an upper edge 8 of the decompression absorbing panel 6 and a pair of vertical grooves 13 extending along each side edge 9 of the decompression absorbing panel 6 and connected to the upper groove 12. The depth of each upper groove 12 is different from the depth of the vertical groove 13 at least at the connecting part between the upper groove 12 and each of the vertical grooves 13.SELECTED DRAWING: Figure 1

Description

The present invention relates to a synthetic resin container.

Synthetic resin containers made of polyethylene terephthalate (PET) are lightweight, easy to handle, have excellent storage stability of the contents, and are inexpensive, so they are used for beverages, foods, and cosmetics. It is used for various purposes such as use.

In such a synthetic resin container, a decompression absorption panel may be provided on the body or shoulder so as to cope with high-temperature filling in which the contents are filled in a heated state (for example, Patent Documents 1 to 1). 3). When the contents are filled at a high temperature, if the temperature of the contents drops after the mouth is closed with a cap, the inside of the container is decompressed and unexpected deformation (illegal deformation) may occur. The decompression absorption panel can absorb the decompression in the container by deforming preferentially over other parts, and can suppress the occurrence of erroneous deformation.

International Publication No. 03/045791 Japanese Patent No. 4849313 Japanese Patent No. 5110461

When the decompression absorption panel is provided on the shoulder, the decompression absorption panel usually has a shape that widens downward. For this reason, the decompression absorption panel provided on the shoulder tends to have both corners on the upper portion easily broken at the time of decompression and have poor resilience. This problem becomes particularly remarkable when trying to thin the container from the viewpoint of environmental compatibility, low cost, and the like. Therefore, there is a need for a structure that reinforces both corners of the upper part of the decompression absorption panel provided on the shoulder.

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 having a vacuum absorbing panel having excellent strength on the shoulder.

The synthetic resin container of the present invention closes a tubular mouth portion, a shoulder portion whose diameter expands downward from the mouth portion, a body portion connected to the lower end of the shoulder portion, and the lower end of the body portion. It has a bottom and the shoulder has a plurality of decompression absorbing panels that widen downward and line up in the circumferential direction, each of which extends along the upper edge of the decompression absorbing panel. It has a reinforcing groove including an upper groove and a pair of vertical grooves extending along each side edge of the decompression absorption panel and connecting to the upper groove, and the depth of each of the upper grooves is at least the upper groove and each of them. The connecting portion with the flute is different from the depth of the flute.

In the synthetic resin container of the present invention, in the above configuration, it is preferable that the depth of each upper groove is shallower than the depth of the vertical groove at least at the connecting portion between the upper groove and each of the vertical grooves.

In the synthetic resin container of the present invention, in the above configuration, the depth of each of the upper grooves at the central portion in the circumferential direction is equivalent to the depth of the vertical groove at the connecting portion between the upper groove and each of the vertical grooves. Is preferable.

In the above configuration, the synthetic resin container of the present invention preferably has a curved linear shape in which the upper edge of each of the decompression absorption panels is convex upward.

In the synthetic resin container of the present invention, in each of the pressure-reducing absorption panels, it is preferable that the adjacent vertical grooves and the side edges of the pressure-reducing absorption panels are parallel to each other.

In the above configuration, the synthetic resin container of the present invention preferably has a length of each of the vertical grooves of 5 mm or more and 10% or more of the total length of the pressure reducing absorption panel in the central portion in the circumferential direction.

In the synthetic resin container of the present invention, the depth of each of the reinforcing grooves is preferably 0.4 mm or more in the above configuration.

According to the present invention, it is possible to provide a synthetic resin container having a vacuum absorbing panel having excellent strength on the shoulder.

It is a side view which shows the synthetic resin container which is one Embodiment of this invention. It is a top view of the synthetic resin container shown in FIG. It is a partially enlarged view of the synthetic resin container shown in FIG.

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

The synthetic resin container 1 (hereinafter, also referred to as container 1) according to the embodiment of the present invention shown in FIGS. 1 to 3 can be used for accommodating various contents such as beverages, foods, and cosmetics. it can. The container 1 is suitable for high-temperature filling in which the contents are filled in a high-temperature state heated to a predetermined temperature. The container 1 may be used for accommodating contents that are not filled at high temperature.

The container 1 is, for example, a large container having a capacity of 2.7 L or more, but is not limited to this, and may have various capacities such as 1.8 L, 1 L, 500 mL, and 350 mL. The container 1 is a container with a handle in which individually formed handle members are integrated with the container by insert molding, or a pinch grip type container having an integrally molded grip portion on the body 4 when the container 1 is a large container or the like. And so on. The grip portion of the pinch grip type container is formed by forming a recess for finger contact in the body portion 4 and using this as the grip portion.

The container 1 is made of, for example, polyethylene terephthalate (PET), but is not limited to this, and may be made of other synthetic resin such as polyethylene (PE) and polypropylene (PP). Further, the container 1 is formed by blow molding such as, for example, biaxial stretching blow molding, but is not limited to this.

The container 1 has a cylindrical mouth portion 2, a shoulder portion 3 whose diameter expands downward from the mouth portion 2, a body portion 4 connected to the lower end of the shoulder portion 3, and a bottom portion 5 that closes the lower end of the body portion 4. And have. The mouth portion 2 is not limited to a cylindrical shape, and may have a tubular shape other than a cylindrical shape. The mouth portion 2, the shoulder portion 3, the body portion 4, and the bottom portion 5 have a common central axis O, but the present invention is not limited to this. In the present application, the vertical direction means the direction along the central axis O, the upper direction means the direction from the shoulder portion 3 to the mouth portion 2 (that is, the upper direction in FIG. 1), and the downward direction is the opposite direction. The circumferential direction means a direction that orbits around the central axis O, and the radial direction means a direction that is orthogonal to the central axis O.

The mouth portion 2 has a male screw portion 2a for attaching a cap (not shown). In addition, instead of the male screw portion 2a, an undercut-shaped convex portion for attaching the cap by tapping may be provided. The mouth portion 2 has an annular neck ring 2b centered on the central axis O arranged below the male screw portion 2a, but is not limited to this.

The shoulder portion 3 has a truncated cone shape, but may have a shape other than the truncated cone shape as long as the diameter increases downward from the mouth portion 2. The shoulder portion 3 has a plurality of decompression absorption panels 6 which are widened downward and arranged in the circumferential direction. The number of the decompression absorption panels 6 is eight, but the number is not limited to this, and the number can be increased or decreased as appropriate. When the inside of the container 1 is decompressed, the decompression absorption panel 6 is deformed with priority over other parts, and can absorb the decompression. The shoulder portion 3 may have one or more annular reinforcing peripheral grooves centered on the central axis O in a portion above and / or a portion below the decompression absorption panel 6.

The body portion 4 has a cylindrical shape, but is not limited to this, and may be, for example, a square cylinder or have a grip portion as described above. Further, the body portion 4 may have a panel portion for absorbing reduced pressure. The body portion 4 may have one or more circumferential reinforcing grooves forming an annular shape centered on the central axis O.

The shape of the bottom portion 5 is not particularly limited as long as the lower end of the body portion 4 is closed. The bottom portion 5 has, but is not limited to, an annular ground contact portion 5a centered on the central axis O and a central portion 5b that rises inside the ground contact portion 5a in the radial direction.

As shown in FIGS. 2 to 3, the plurality of decompression absorption panels 6 are arranged in the circumferential direction with an interval, and the pillar portion 7 is formed by the interval. That is, the plurality of decompression absorption panels 6 and the plurality of pillar portions 7 are alternately arranged in the circumferential direction. The shoulder portion 3 is not limited to having a plurality of pillar portions 7, and for example, a plurality of decompression absorption panels 6 may be arranged in the circumferential direction without any gap.

Each decompression absorption panel 6 has an upper edge 8, a pair of side edges 9, and a lower edge 10. In addition, in FIGS. 1 to 3, only one decompression absorption panel 6 is designated by the upper edge 8, the pair of side edges 9, and the lower edge 10.

When the decompression absorption panel 6 is viewed from the radial direction (front view, see FIG. 3), each decompression absorption panel 6 has an upper edge 8 in a curved linear shape that is convex upward, and each side edge 9 has a curved line shape. It is linear, and the lower edge 10 is linear, but the present invention is not limited to this. For example, the upper edge 8 may be a straight line or a curved line that is convex downward, or each side edge 9 may be a curved line that is convex outward or inward of the decompression absorption panel 6. However, the lower edge 10 may have a curved linear shape that is convex upward or downward. However, it is preferable that the upper edge 8 has an upwardly convex curved line shape from the viewpoint of increasing the strength of the decompression absorption panel 6 described later.

Each decompression absorption panel 6 has a concave shape when viewed from the outside of the container 1 because the outer peripheral edge composed of the upper edge 8, the pair of side edges 9, and the lower edge 10 is composed of the annular step portion 11. I'm doing it. That is, each decompression absorption panel 6 is composed of a panel bottom wall 6a and a panel peripheral wall 6b extending from the outer peripheral edge of the panel bottom wall 6a to the outside of the container 1. However, the shape of each decompression absorption panel 6 is not limited to this. In FIGS. 1 to 3, only one decompression absorption panel 6 is designated by the annular step portion 11, the panel bottom wall 6a, and the panel peripheral wall 6b.

Each decompression absorption panel 6 has an upper groove 12 extending along the upper edge 8 of the decompression absorption panel 6 and a pair of vertical grooves 13 extending along each side edge 9 of the decompression absorption panel 6 and connected to the upper groove 12. It has a reinforcing groove 14 made of. Therefore, both corners of the upper part of each decompression absorption panel 6, that is, the connecting portion between the upper edge 8 and the pair of side edges 9 are reinforced by the reinforcing groove 14, and the two corners are hard to break when the pressure in the container 1 is reduced. It can be easily restored. In this way, the reinforcing groove 14 can increase the strength of the pressure reducing absorption panel 6. In addition, in FIGS. 1 to 3, only one decompression absorption panel 6 is designated by the reinforcing groove 14 and each part thereof.

The upper edge of each upper groove 12 coincides with the upper edge 8 of the panel bottom wall 6a, but the present invention is not limited to this, and the upper groove 12 may extend along the upper edge 8 of the decompression absorption panel 6. For example, the upper edge of each upper groove 12 may be located slightly below the upper edge 8 of the panel bottom wall 6a. Further, the outer side edge of each vertical groove 13 coincides with the side edge 9 of the panel bottom wall 6a, but the present invention is not limited to this, and each vertical groove 13 is along the side edge 9 of the decompression absorption panel 6. It suffices if it extends. For example, the outer side edge of each flute 13 may be located slightly inside the side edge 9 of the panel bottom wall 6a.

Further, the depth of each upper groove 12 is set shallower than the depth of the vertical groove 13 at the connecting portion 15 between the upper groove 12 and each of the vertical grooves 13. Therefore, by setting the connecting portion 15 in a stepped shape due to the difference in depth in this way, both corners of the upper portion of the decompression absorption panel 6 are efficiently reinforced, and the strength of the decompression absorption panel 6 is efficiently increased. Can be enhanced to. It should be noted that such an effect can also be enjoyed when the depth of each upper groove 12 is set deeper than the depth of the vertical groove 13 at the connecting portion 15 between the upper groove 12 and each vertical groove 13. Therefore, the depth of each upper groove 12 may be different from the depth of the vertical groove 13 at least at the connecting portion 15 between the upper groove 12 and each of the vertical grooves 13. However, in order to increase the strength of the decompression absorption panel 6 more efficiently, the depth of each upper groove 12 must be shallower than the depth of the vertical groove 13 at least at the connecting portion 15 between the upper groove 12 and each vertical groove 13. Is preferable.

In each decompression absorption panel 6, the connecting portion 15 having a stepped shape due to the difference in depth is located at the upper end of each vertical groove 13. Therefore, both corners of the upper portion of the decompression absorption panel 6 can be reinforced more efficiently, and the strength of the decompression absorption panel 6 can be increased more efficiently. The position of the connecting portion 15 is not limited to this. In each decompression absorption panel 6, the connecting portion 15 having a stepped shape due to the difference in depth is located at the inner edge at the upper end of each vertical groove 13, but is not limited to this, for example, each vertical groove 13. It may be located on the upper edge at the upper end of the.

The depth of each upper groove 12 at the central portion 12a in the circumferential direction is equivalent to the depth of the vertical groove 13 at the connecting portion 15 between the upper groove 12 and each of the vertical grooves 13. Therefore, both corners of the upper portion of the decompression absorption panel 6 can be reinforced more efficiently, and the strength of the decompression absorption panel 6 can be increased more efficiently. The depth of each upper groove 12 at the central portion 12a in the circumferential direction is not limited to this.

In each decompression absorption panel 6, the adjacent vertical grooves 13 and the side edge 9 of the decompression absorption panel 6 are parallel to each other. Therefore, both corners of the upper portion of the decompression absorption panel 6 can be reinforced more efficiently, and the strength of the decompression absorption panel 6 can be increased more efficiently. The configuration of each decompression absorption panel 6 is not limited to this.

The length of each vertical groove 13 is 5 mm or more and 10% or more of the total length of the pressure reducing absorption panel 6 at the central portion in the circumferential direction. Therefore, both corners of the upper portion of the decompression absorption panel 6 can be reinforced more reliably, and the strength of the decompression absorption panel 6 can be increased more reliably. The length of each vertical groove 13 is not limited to this.

The depth of each reinforcing groove 14 with respect to the panel bottom wall 6a is 0.4 mm or more over the entire length of the reinforcing groove 14. Therefore, both corners of the upper portion of the decompression absorption panel 6 can be reinforced more reliably, and the strength of the decompression absorption panel 6 can be increased more reliably. The depth of each reinforcing groove 14 is not limited to this.

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.

1 Synthetic resin container 2 Mouth part 2a Male thread part 2b Neck ring 3 Shoulder part 4 Body part 5 Bottom part 5a Grounding part 5b Central part 6 Decompression absorption panel 6a Panel bottom wall 6b Panel peripheral wall 7 Pillar part 8 Upper edge of decompression absorption panel 9 Side edge of decompression absorption panel 10 Lower edge of decompression absorption panel 11 Circular step portion of decompression absorption panel 12 Upper groove 12a Circumferential central part of upper groove 13 Vertical groove 14 Reinforcing groove 15 Connecting part O Central axis

Claims (7)

It has a tubular mouth, a shoulder that expands in diameter downward from the mouth, a body that connects to the lower end of the shoulder, and a bottom that closes the lower end of the body.
The shoulder portion has a plurality of decompression absorption panels that widen downward and are arranged in the circumferential direction.
Each of the decompression absorption panels is a reinforcing groove composed of an upper groove extending along the upper edge of the decompression absorption panel and a pair of vertical grooves extending along each side edge of the decompression absorption panel and connecting to the upper groove. Have,
A synthetic resin container characterized in that the depth of each of the upper grooves is different from the depth of the vertical grooves at least at the connecting portion between the upper grooves and the respective vertical grooves. The synthetic resin container according to claim 1, wherein the depth of each upper groove is shallower than the depth of the vertical groove at least at the connecting portion between the upper groove and each of the vertical grooves. The synthetic resin container according to claim 2, wherein the depth of each of the upper grooves in the central portion in the circumferential direction is equal to the depth of the vertical groove at the connecting portion between the upper groove and each of the vertical grooves. The synthetic resin container according to any one of claims 1 to 3, wherein the upper edge of each of the decompression absorption panels has a curved linear shape that is convex upward. The synthetic resin container according to any one of claims 1 to 4, wherein in each of the pressure-reducing absorption panels, the adjacent vertical grooves and the side edges of the pressure-reducing absorption panels are parallel to each other. The synthetic resin container according to any one of claims 1 to 5, wherein the length of each of the flutes is 5 mm or more and 10% or more of the total length of the decompression absorption panel at the central portion in the circumferential direction. The synthetic resin container according to any one of claims 1 to 6, wherein the depth of each reinforcing groove is 0.4 mm or more.

Images