Synthetic resin container

Abstract

To provide a new synthetic resin container that increases a reaction speed of a reduced pressure absorption panel during decompression while securing a large absorption capacity even when the reduced pressure absorption panel has a small area.SOLUTION: A synthetic resin container 100 of the present disclosure comprises a mouth 2 which serves as a bung hole for contents, a trunk part 4 which continues into the mouth 2 via a shoulder part 3, and a bottom 5 for closing the lower end of the trunk part 4. In the synthetic resin container 100, the trunk part 4 has a plurality of reduced pressure absorption panels 11 which has a vertically long rectangular shape and which is arranged in a circumferential direction. The reduced pressure absorption panel 11 has a vertical groove 13A which is arranged in an almost central position in the circumferential direction and which is formed out of a plurality of recesses 13.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a bottle-shaped synthetic resin container having a mouth portion serving as an outlet for the contents, a body portion connected to the mouth portion via a shoulder portion, and a bottom portion closing the lower end of the body portion, and particularly to one in which a decompression absorption panel is provided on the body portion.

Background Art

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

[0003] For example, Patent Document 1 discloses a container having a substantially circular shape in plan view. This container is a synthetic resin container having a mouth portion serving as an outlet for the contents, a body portion connected to the mouth portion via a shoulder portion, and a bottom portion closing the lower end of the body portion. A decompression absorption panel is formed in a recessed shape on the body portion. When the mouth portion is closed with a cap after the contents are filled at a high temperature, a decompression may occur in the container as the contents cool, and a large deformation may occur in the body portion. By providing a decompression absorption panel on the body portion to address this problem, the decompression in the container can be absorbed by the deformation of the decompression absorption panel, and the container can be prevented from being deformed irregularly.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the case of a small PET bottle with a content volume of 350 [ml] or 280 [ml], or a PET bottle with a label attached to the upper part of the body and a vacuum absorption panel provided at the lower part, since the area where the vacuum absorption panel can be provided is limited, it is necessary to greatly displace the vacuum absorption panel radially inward to secure the absorption capacity. In addition, in consideration of the environment, weight reduction of the container by thinning is being promoted. However, if the vacuum absorption panel does not quickly follow the decompression inside the container, plastic deformation may occur in the thinned areas other than the vacuum absorption panel due to the decompression inside the container. Therefore, there was room for improvement in these points.

[0006] The present disclosure has been made in view of such problems, and an object thereof is to provide a new synthetic resin container that ensures a large absorption capacity even when the area of the vacuum absorption panel is small and improves the reaction speed of the vacuum absorption panel during decompression.

Means for Solving the Problems

[0007] In order to solve the above problems, the synthetic resin container of the present disclosure is [1] A synthetic resin container having a mouth part that serves as an outlet for the content, a body part that is connected to the mouth part via a shoulder part, and a bottom part that closes the lower end of the body part, The body part has a vertically long rectangular shape and has a plurality of vacuum absorption panels arranged in the circumferential direction, The vacuum absorption panel is characterized by having a longitudinal groove formed by a plurality of recesses and being disposed at a substantially central position in the circumferential direction.

[0008] Also, the synthetic resin container of the present disclosure is [2] In the configuration described in [1] above, it is preferable that the longitudinal groove extends above and / or below the vacuum absorption panel from a height position that is a distance of 40% to 60% of the vertical length of the vacuum absorption panel upward from the lower end of the vacuum absorption panel.

[0009] Also, the synthetic resin container of the present disclosure is [3] In the configuration according to the above [1] or [2], it is preferable that the plurality of recesses have a circular shape when viewed from the outer side in the radial direction.

[0010] Further, the synthetic resin container of the present disclosure [4] In the configuration according to any one of the above [1] to [3], it is preferable that the bottom of the decompression absorption panel has an arcuate shape that protrudes outward in the radial direction both in the longitudinal section and the cross section.

[0011] Further, the synthetic resin container of the present disclosure [5] In the configuration according to the above [4], it is preferable that the maximum protrusion amount of the arcuate shape with respect to the maximum depth of the bottom of the decompression absorption panel is less than 50%.

[0012] Further, the synthetic resin container of the present disclosure [6] In the configuration according to the above [2], it is preferable that the longitudinal groove is provided in either the upper part or the lower part of the decompression absorption panel, and a tapered recess having a reduced circumferential width toward the longitudinal groove is provided in the other part.

[0013] Further, the synthetic resin container of the present disclosure [7] In the configuration according to the above [6], it is preferable that the tapered recess has an increasing amount of recess toward the inside in the radial direction toward the longitudinal groove.

Advantages of the Invention

[0014] According to the present disclosure, it is possible to provide a new synthetic resin container that improves the reaction speed of the decompression absorption panel during decompression while ensuring a large absorption capacity even with a small area of the decompression absorption panel.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0016] Hereinafter, the present disclosure will be more specifically illustrated with reference to the drawings.

[0017] The synthetic resin container 100 according to the first embodiment of the present disclosure shown in FIG. 1 contains beverages such as fruit juice drinks and tea, and seasonings such as soy sauce, vinegar, and sauce as contents, and is suitable for hot filling in which the contents are filled in a hot state heated to a predetermined temperature. Further, it is not limited to the case where the contents are hot filled, and it can be widely applied to products in which a reduced pressure occurs in the container. In the present embodiment, for example, a relatively small synthetic resin container 100 with a content volume of 350 [ml] is assumed, but it is not limited to this mode. In the present specification, claims, abstract, and drawings, the vertical direction is based on the state in which the synthetic resin container 100 is upright on a horizontal plane, the side where the mouth portion 2 is located is the upper side, and the side where the bottom portion 5 is located is the lower side. Also, the reference symbol O in FIG. 1 indicates a common central axis of the mouth portion 2, shoulder portion 3, body portion 4, and bottom portion 5 described later. The radially outer side is the direction away from the central axis O along a straight line passing through the central axis O of the synthetic resin container 100 in FIG. 1 and perpendicular to the central axis O, and the radially inner side refers to the direction toward the central axis O along the straight line. Further, the circumferential direction refers to the direction of rotation around the central axis O of the synthetic resin container 100 in FIG. 1.

[0018] The accompanying drawings of the present disclosure are drawn at the same scale in the vertical, front-rear, and left-right directions, and the aspect ratio of the synthetic resin container 100 on the drawing represents the aspect ratio of the synthetic resin container 100 in one embodiment of the present disclosure. However, the configuration, shape, dimensional ratio, etc. of the synthetic resin container 100 in the accompanying drawings are merely one embodiment of the present disclosure. The present disclosure should be interpreted based on the language of the claims and is not limited to the configuration, shape, dimensional ratio, etc. shown in the drawings.

[0019] This synthetic resin container 100 is formed in a bottle shape having a mouth portion 2 serving as an outlet for the contents, a shoulder portion 3 connected to the lower end of the mouth portion 2 and expanding in diameter downward, a body portion 4 having a substantially circular shape in plan view connected to the mouth portion 2 via the shoulder portion 3, and a bottom portion 5 closing the lower end of the body portion 4. Note that the shape of the body portion 4 is not limited to a substantially circular shape in plan view, and may be various flat shapes such as an elliptical shape or a truck shape, or a rectangular shape (square container).

[0020] This synthetic resin container 100 can be configured as a so-called PET bottle by biaxially stretching and blow molding a preform made of, for example, polyethylene terephthalate (PET). Note that the synthetic resin container 100 is not limited to polyethylene terephthalate, and may also be formed by biaxially stretching and blow molding a preform made of other synthetic resins having thermoplasticity such as oriented polypropylene (OPP). Further, regarding the manufacturing method of the synthetic resin container 100, not only the method of biaxially stretching and blow molding a preform, but also various manufacturing methods such as extrusion blow molding of a resin material can be adopted.

[0021] On the outer peripheral surface of the mouth portion 2, as shown in FIG. 1, a male screw 2a and a neck ring 2b extending substantially horizontally outward in the radial direction below the male screw 2a are formed. After the contents are filled at a high temperature, the mouth portion 2 can be closed by screwing a cap (not shown) onto the male screw 2a of the mouth portion 2. Further, instead of providing the male screw 2a on the outer peripheral surface of the mouth portion 2, a protrusion may be provided, and the mouth portion 2 may be closed by engaging the cap by caulking.

[0022] When forming the synthetic resin container 100 by stretch blow molding of a preform, for example, the neck ring 2b can be attached to the mold without tilting the preform by bringing the lower surface of the neck ring 2b into contact with the reference surface of the blow mold.

[0023] The body portion 4 has a substantially circular shape in plan view. As shown in FIG. 1, the body portion 4 includes an outer peripheral surface 4a partitioned in the vertical direction by an upper circumferential groove 4b. As shown in FIG. 1, six pressure-reducing absorption panels 11 having a vertically long shape are provided at equal intervals in the circumferential direction on the outer peripheral surface 4a. In this embodiment, all six pressure-reducing absorption panels 11 have the same shape.

[0024] As shown in FIG. 1, the pressure-reducing absorption panel 11 is formed to be recessed radially inward from the outer peripheral surface 4a of the body portion 4, and includes a rectangular recess 14 that defines the outer edge of the pressure-reducing absorption panel 11, and a vertical groove 13A that is further recessed radially inward from the bottom 14a (see FIG. 2) of the rectangular recess 14.

[0025] In this embodiment, the pressure-reducing absorption panel 11 is provided at a substantially central height position of the lower outer peripheral surface 4a partitioned by the upper circumferential groove 4b in the body portion 4. Further, the pressure-reducing absorption panel 11 is provided with R surfaces at the four corners in side view (when viewed from the radially outer side), and is configured such that stress concentration is less likely to occur during high-temperature filling and cooling.

[0026] As described above, by providing the upper circumferential groove 4b at the upper part of the body portion 4, the radial rigidity of the body portion 4 can be increased, and irregular deformation of the container can be suppressed.

[0027] As shown in FIG. 1, the rectangular recess 14 demarcates the outer edge of the pressure-reducing absorption panel 11 having a substantially rectangular shape in side view. As shown in the longitudinal sectional view of FIG. 2, the rectangular recess 14 is a recess that is recessed radially inward (leftward in FIG. 2) from the outer peripheral surface 4a of the body portion 4, and the substantially central position in the vertical direction at the bottom 14a forms an arc surface SC (arc shape) that bulges most radially outward. In a region above the central position in the vertical direction where a plurality of vertical grooves 13A described later are provided, the envelope formed by the regions between the plurality of recesses 13 that form the vertical grooves 13A also forms an arc surface. In addition to the longitudinal section of the pressure-reducing absorption panel 11 shown in FIG. 2, in the cross section as well, the bottom 14a of the rectangular recess 14 is formed so as to draw an arc surface where the central position in the circumferential direction bulges most radially outward. That is, the bottom 14a of the rectangular recess 14 is formed so as to draw a generally spherical crown surface that is convex radially outward.

[0028] In FIG. 2, a virtual circumferential surface CL is drawn at a virtual position having the same radius as the outer peripheral surface 4a.

[0029] As described above, by forming the bottom 14a of the rectangular recess 14 so as to draw a spherical crown surface, when a reduced pressure occurs inside the synthetic resin container 100, the bottom 14a can be largely displaced radially inward as compared with the case where the bottom 14a is a flat surface. Therefore, even if the area of the pressure-reducing absorption panel 11 is small, a large pressure-reducing absorption capacity can be ensured.

[0030] Note that the shape of the bottom 14a may be configured to have an arc surface only in either the longitudinal section or the cross section in addition to the spherical crown surface. Further, the bottom 14a may be formed in a shape other than the spherical crown surface or the arc surface, such as a substantially flat surface.

[0031] In a region above the vertical center position at the bottom 14a of the rectangular recess 14, a vertical groove 13A extending in the vertical direction is formed. As shown in FIGS. 1 and 2, the vertical groove 13A is constituted by a plurality of recesses 13 (dimples) arranged at predetermined intervals in the vertical direction at a substantially central position in the circumferential direction of the pressure-reducing absorption panel 11. In the present embodiment, the recess 13 is formed to be substantially circular in a side view (when viewed from the outer side in the radial direction), and for example, the bottom of the recess 13 can be formed to have a substantially spherical crown surface. In the present embodiment, a fillet 13f by R chamfering is formed at the outer edge of the recess 13, and each recess 13 is connected vertically to an adjacent recess 13 via the fillet 13f. Therefore, the plurality of recesses 13 form a vertically continuous vertical groove 13A. Note that the bottom surfaces of the plurality of recesses 13 may be arranged so as to overlap vertically. Also, the fillets 13f provided at the outer edges of the respective recesses 13 of the plurality of recesses 13 may be arranged so as to be vertically separated.

[0032] By providing the vertical groove 13A at a substantially central position in the circumferential direction of the pressure-reducing absorption panel 11 as described above, when a pressure reduction occurs inside the synthetic resin container 100, stress concentrates at the central positions in the circumferential direction and the vertical direction of the pressure-reducing absorption panel 11. However, by providing this vertical groove 13A, the concentrated stress can be propagated upward and / or downward along the extending direction of the vertical groove 13A. That is, the vertical central position of the pressure-reducing absorption panel 11 is displaced radially inward by the pressure reduction, but by providing the vertical groove 13A, the upper part of the pressure-reducing absorption panel 11 can also be displaced radially inward. Therefore, the displacement of the upper part of the pressure-reducing absorption panel 11 radially inward can be induced to increase the absorption capacity. Further, following the displacement of the upper part of the pressure-reducing absorption panel 11 radially inward, the displacement of the lower part of the pressure-reducing absorption panel 11 can also be induced. In this way, since the displacement radially inward is induced in the order of the vertical central position → upper part → lower part of the pressure-reducing absorption panel 11, it can be made easier to displace compared to the case where the entire vertical region of the pressure-reducing absorption panel 11 is displaced simultaneously. Therefore, the reaction speed of the pressure-reducing absorption panel 11 radially inward can be improved.

[0033] In this embodiment, the vertical groove 13A is disposed at the circumferential center position of the pressure reduction absorption panel 11. Further, the vertical groove 13A may be disposed at a substantially circumferential center position defined such that the deviation from the circumferential center position of the pressure reduction absorption panel 11 is within 10% of the circumferential length of the pressure reduction absorption panel 11. Further, the vertical groove 13A extends from slightly above (by about 5% of the vertical length of the pressure reduction absorption panel 11) the central height in the vertical direction of the pressure reduction absorption panel 11 to the vicinity of the upper end of the rectangular recess 14. However, this mode is not limited thereto, and the vertical groove 13A may extend, for example, from a height position that is a distance of 40% to 60% of the vertical length of the pressure reduction absorption panel 11 upward from the lower end of the pressure reduction absorption panel 11 to the vicinity of the upper end or the lower end of the pressure reduction absorption panel 11. Further, the vertical groove 13A may extend from the vicinity of the upper end to the vicinity of the lower end of the pressure reduction absorption panel 11. Note that the vicinity of the upper end and the vicinity of the lower end of the pressure reduction absorption panel 11 refer to cases where the distances to the upper end and the lower end of the pressure reduction absorption panel 11 are within 10% of the vertical length of the pressure reduction absorption panel 11.

[0034] Note that the pressure reduction absorption panel 11 is a concept that generally includes a frame portion that connects the bottom portion 14a and the outer peripheral surface 4a other than the bottom portion 14a that constitutes the panel. However, the vertical groove 13A and the tapered recess 12 described in the second embodiment are provided in the bottom portion 14a of the pressure reduction absorption panel 11, respectively. Therefore, the terms "vertical length" and "circumferential length" of the pressure reduction absorption panel 11 used to specify the positions of the vertical groove 13A and the tapered recess 12 shall mean the vertical length and the circumferential length of the bottom portion 14a of the rectangular recess 14, respectively. Further, the terms "upper end portion", "lower end portion", and "side end portion" of the pressure reduction absorption panel 11 used to specify the positions of the vertical groove 13A and the tapered recess 12 shall mean the upper end portion, the lower end portion, and the side end portion of the bottom portion 14a of the rectangular recess 14, respectively.

[0035] Note that although it has a form different from that of the first embodiment and the second embodiment to be described later, depending on the absorption capacity required for the synthetic resin container 100, there may also be an aspect in which the vertical groove is configured as a linear groove portion that is continuous in the vertical direction.

[0036] The diameter of the virtual circumferential surface CL passing through the column portion 16 (outer peripheral surface 4a) located in the region between the pressure-reducing absorption panels 11 adjacent in the circumferential direction can be, for example, 66 [mm] in diameter. And, based on the maximum depth from the outer peripheral surface 4a of the bottom portion 14a of the pressure-reducing absorption panel 11 radially inward, it is preferable that the maximum protruding amount of the arc surface SC is less than 50% (preferably less than 40%). For example, when the maximum depth of the bottom portion 14a of the pressure-reducing absorption panel 11 is 4 [mm], the maximum protruding amount of the arc surface SC is preferably about 1.5 mm, for example. By setting the maximum protruding amount of the arc surface SC with respect to the maximum depth of the bottom portion 14a within the above range, while ensuring the necessary absorption capacity, a plurality of pressure-reducing absorption panels 11 can be displaced radially inward substantially evenly with respect to the reduced pressure inside the synthetic resin container 100. This is because if the maximum protruding amount of the arc surface SC is too small, a predetermined absorption capacity cannot be obtained, and if the maximum protruding amount of the arc surface SC is too large, a large reduced pressure is required for the pressure-reducing absorption panel 11 to be displaced radially inward.

[0037] Note that the depth from the outer peripheral surface 4a of the bottom portion 14a radially inward in the longitudinal section is maximum at the upper end portion and the lower end portion of the bottom portion 14a, as shown in FIG. 2. Similarly, the depth from the outer peripheral surface 4a of the bottom portion 14a radially inward in the cross section is maximum at the circumferential end portion of the bottom portion 14a.

[0038] As described above, this embodiment is a synthetic resin container 100 including a mouth portion 2 that serves as an outlet for the contents, a body portion 4 that is connected to the mouth portion 2 via a shoulder portion 3, and a bottom portion 5 that closes the lower end of the body portion 4. The body portion 4 has a vertically long rectangular shape and a plurality of decompression absorption panels 11 arranged in the circumferential direction. The decompression absorption panel 11 has a vertically long rectangular shape and is configured to have a longitudinal groove 13A formed by a plurality of recesses 13 and disposed at a substantially central position in the circumferential direction. By adopting such a configuration, when decompression occurs inside the synthetic resin container 100, the stress concentrated on the decompression absorption panel 11 can be propagated upward and / or downward along the extending direction of the longitudinal groove 13A by this longitudinal groove 13A. That is, the central position in the vertical direction of the decompression absorption panel 11 is displaced radially inward by decompression, but by providing the longitudinal groove 13A, the upper part and / or the lower part of the decompression absorption panel 11 can also be displaced radially inward. Therefore, it is possible to induce the displacement of the upper part and / or the lower part of the decompression absorption panel 11 radially inward, increase the absorption capacity, and improve the reaction speed of the decompression absorption panel 11 radially inward.

[0039] Also, in this embodiment, the longitudinal groove 13A is configured to extend upward and / or downward from a height position that is a distance of 40% to 60% of the vertical length of the decompression absorption panel 11 from the lower end portion of the decompression absorption panel 11. By adopting such a configuration, in particular, the stress concentrated on the central position in the vertical direction of the decompression absorption panel 11 can be propagated upward and / or downward along the extending direction of the longitudinal groove 13A by this longitudinal groove 13A. Therefore, it is possible to efficiently induce the displacement of the upper part and / or the lower part of the decompression absorption panel 11 radially inward, increase the absorption capacity, and improve the reaction speed of the decompression absorption panel 11 radially inward.

[0040] In addition, in the present embodiment, the plurality of recesses 13 are configured to have a circular shape when viewed from the outside in the radial direction. By adopting such a configuration, each recess 13 can be used as an independent starting point for displacement inward in the radial direction. Therefore, displacement inward in the radial direction of the upper part and / or the lower part of the decompression absorption panel 11 can be efficiently induced, the absorption capacity can be increased, and the reaction speed of the decompression absorption panel 11 inward in the radial direction can be improved.

[0041] In addition, in the present embodiment, the bottom 14a of the decompression absorption panel 11 is configured to have an arcuate shape that protrudes outward in the radial direction both in the longitudinal section and the cross-sectional view. By adopting such a configuration, when a decompression occurs inside the synthetic resin container 100, the bottom 14a can be displaced significantly inward in the radial direction compared to the case where the bottom 14a is flat. Therefore, even if the area of the decompression absorption panel 11 is small, a large decompression absorption capacity can be provided.

[0042] In addition, in the present embodiment, the maximum protrusion amount of the arcuate shape (arc surface SC) with respect to the maximum depth of the bottom 14a of the decompression absorption panel 11 is configured to be less than 50%. By adopting such a configuration, the plurality of decompression absorption panels 11 can be displaced substantially evenly inward in the radial direction with respect to the decompression inside the synthetic resin container 100.

[0043] Next, the synthetic resin container 200 which is the second embodiment of the present disclosure shown in FIGS. 3 and 4 will be described in detail. Note that this embodiment is approximated to the configuration of the first embodiment except that a tapered recess 12 is provided below the longitudinal groove 13A in the body portion 4. Therefore, here, the description will focus on the differences from the first embodiment. Also, parts having the same functions as those in the first embodiment will be described using the same reference numerals.

[0044] In this embodiment, as shown in FIGS. 3 and 4, the bottom 14a of the rectangular recess 14 of the vacuum absorption panel 11 has an arcuate surface SC that is convex radially outward in both the longitudinal and cross-sectional views. Further, below the longitudinal groove 13A in the vacuum absorption panel 11, a tapered recess 12 is provided that tapers in the circumferential direction upward from the lower end of the rectangular recess 14 (toward the longitudinal groove 13A). The tip 12b of the tapered recess 12 is located at approximately the central position of the vacuum absorption panel 11 in both the vertical and circumferential directions. As shown in FIG. 4, the tapered recess 12 is formed as a recess that further recesses radially inward from the arcuate surface SC, and its bottom is composed of a flat surface. The amount of recess from the arcuate surface SC radially inward increases gradually upward from the lower end (base end 12a) of the rectangular recess 14. That is, the bottom of the tapered recess 12 is inclined with respect to the central axis O and is arranged to approach the central axis O upward.

[0045] Note that the tapered recess 12 is connected to the bottom 14a of the rectangular recess 14 via a gently sloping portion 12L with a gentle slope as shown in FIG. 3.

[0046] The central position of the vacuum absorption panel 11 in the vertical and circumferential directions that is farthest from the outer edge of the rectangular recess 14 is most likely to be displaced. However, as described above, by providing the tapered recess 12 with its tip 12b located at approximately the central position of the vacuum absorption panel 11 in both the vertical and circumferential directions, the tip 12b of the tapered recess 12 serves as the starting point of vacuum deformation, and further, since the tip 12b is recessed radially inward more than the base end 12a, displacement inward can be induced. Note that the radial position of the tip 12b may be the same as or outside of the base end 12a.

[0047] Note that the approximate central position of the vacuum absorption panel 11 in the vertical and circumferential directions where the tip 12b of the tapered recess 12 is located is a height position that is 40% to 60% of the vertical length of the vacuum absorption panel 11 upward from the lower end of the vacuum absorption panel 11, and is a position within ±10% of the circumferential length of the vacuum absorption panel 11 from the circumferential center position of the vacuum absorption panel 11.

[0048] In this embodiment, the vertical groove 13A is arranged at the upper part of the vacuum absorption panel 11 and the tapered recess 12 is arranged at the lower part, but the present invention is not limited to this embodiment. The vertical groove 13A may be arranged at the lower part of the vacuum absorption panel 11 and the tapered recess 12 may be arranged at the upper part of the vacuum absorption panel 11. In that case, the vertical groove 13A is preferably arranged to extend downward from a height position that is 40% to 60% of the vertical length of the vacuum absorption panel 11 from the lower end of the vacuum absorption panel 11. Further, the tapered recess 12 is arranged such that the width in the circumferential direction decreases downward from the upper end of the rectangular recess 14, and the tip 12b of the tapered recess 12 is preferably arranged at a substantially central position in the vertical and circumferential directions of the vacuum absorption panel 11. Further, the tapered recess 12 is configured such that the amount of recess inward in the radial direction increases gradually downward from the upper end.

[0049] As described above, in this embodiment, the vertical groove 13A is provided in either the upper part or the lower part of the vacuum absorption panel 11, and the tapered recess 12 with the width in the circumferential direction reduced toward the vertical groove 13A is provided in the other part. By adopting such a configuration, the vertical groove 13A induces displacement inward in the radial direction of the upper part and / or the lower part of the vacuum absorption panel 11, and the tip 12b of the tapered recess 12 serves as a starting point for decompression deformation, and displacement inward in the radial direction can be induced. Therefore, the absorption capacity can be increased. Further, after the tapered recess 12 is displaced inward in the radial direction, the region provided with the vertical groove 13A is displaced inward in the radial direction following this deformation. Therefore, the reaction speed inward in the radial direction of the vacuum absorption panel 11 can be further improved as compared with the case where the entire region of the vacuum absorption panel 11 is displaced simultaneously.

[0050] Further, in the present embodiment, the tapered recess 12 is configured such that the amount of recess in the radial inner direction toward the longitudinal groove 13A increases. By adopting such a configuration, the tip portion 12b of the tapered recess 12 is recessed more radially inward than the base end portion 12a, thereby effectively inducing the displacement of the pressure-reducing absorption panel 11 in the radial inner direction. Therefore, it is possible to increase the absorption capacity and improve the reaction speed of the pressure-reducing absorption panel 11 in the radial inner direction.

[0051] Although the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these modifications and corrections are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically contradictory, and a plurality of components can be combined into one or divided. It should be understood that these are also included in the scope of the present invention.

[0052] For example, in the present embodiment, the six pressure-reducing absorption panels 11 are configured to have the same shape and the same size, but this aspect is not limited thereto, and the pressure-reducing absorption panels 11 may have different shapes or sizes. Further, the number of the pressure-reducing absorption panels 11 is not limited to six, and may be five or less or seven or more as long as the necessary pressure-reducing absorption effect can be obtained.

[0053] In the illustrated example, the longitudinal groove 13A is linear and parallel to the central axis O, but this aspect is not limited thereto, and it may be inclined with respect to the central axis O. The longitudinal groove 13A may be, for example, a V-shaped or Y-shaped groove portion that is symmetric about a target axis extending in the vertical direction at a substantially central position in the circumferential direction and is long in the vertical direction.

[0054] In addition, in this embodiment, the upper circumferential groove 4b is configured to be provided as one, but the present invention is not limited to this aspect. Instead of or in addition to the upper circumferential groove 4b, a lower circumferential groove may be provided below the decompression absorption panel 11, or a configuration may be adopted in which neither is provided. Further, at least one of the upper circumferential groove 4b and the lower circumferential groove may be provided in a plurality of different height positions.

[0055] In addition, the contents filled in the synthetic resin containers 100 and 200 are not limited to beverages such as fruit juice drinks and tea, and seasonings such as soy sauce, vinegar, and sauce, but may be other foods, cosmetics, etc.

Explanation of Signs

[0056] 2 Mouth part 2a Male screw 2b Neck ring 3 Shoulder part 4 Barrel part 4a Outer peripheral surface 4b Upper circumferential groove 5 Bottom part 11 Decompression absorption panel 12 Tapered recess 12a Base end part 12b Tip end part 12L Gentle slope part 13 Recess 13A Longitudinal groove 13f Fillet 14 Rectangular recess 14a Bottom part 16 Column part 100,200 Synthetic resin container CL Virtual circumferential surface O Central axis SC Arc surface

Claims

1. A synthetic resin container comprising a mouth portion serving as an outlet for the contents, a body portion connected to the mouth portion via a shoulder, and a bottom portion closing the lower end of the body portion, wherein the body portion has a vertically long rectangular shape and a plurality of decompression absorption panels arranged in the circumferential direction, and the decompression absorption panel is arranged at a substantially central position in the circumferential direction and has a vertical groove formed by a plurality of recesses, the synthetic resin container.

2. The vertical groove extends above and / or below the decompression absorption panel from a height position that is a distance of 40% to 60% of the vertical length of the decompression absorption panel upward from the lower end of the decompression absorption panel. The synthetic resin container according to claim 1.

3. The plurality of recesses have a circular shape when viewed from the outer side in the radial direction. The synthetic resin container according to claim 1 or 2.

4. The bottom of the decompression absorption panel has an arcuate shape that is convex outward in the radial direction in both the longitudinal section and the cross section. The synthetic resin container according to claim 1 or 2.

5. The maximum protrusion amount of the arcuate shape with respect to the maximum depth of the bottom of the decompression absorption panel is less than 50%. The synthetic resin container according to claim 4.

6. The vertical groove is provided in either the upper part or the lower part of the decompression absorption panel, and a tapered recess having a reduced width in the circumferential direction toward the vertical groove is provided in the other part. The synthetic resin container according to claim 2.

7. In the tapered recess, the amount of recess inward in the radial direction increases toward the vertical groove. The synthetic resin container according to claim 6.

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