Flat bottle

Abstract

To provide a flat-shaped bottle capable of suppressing one-way pulling of a body.SOLUTION: There is provided a synthetic resin flat-shaped bottle 1 including a flat-shaped body portion 20, with a panel portion 23 provided on a long side wall portion 21 of the body portion 20, the flat-shaped bottle including: a short-side curved portion 50 extending from a short-side wall portion 22 side and projecting radially outward, the short-side curved portion having a cross-sectional shape perpendicular to an axis O of the body portion 20 at a portion where the panel portion 23 is provided; a panel-side curved portion 51 extending from the side of the panel portion 23 and projecting radially outward; and a connecting portion 52 that connects the short-side curved portion 50 and the panel-side curved portion 51 and is linear or convex inward in the radial direction, in which a connecting portion between one of the short-side curved portion 50 and the panel-side curved portion 51 and the connecting portion 52 forms a ridge-line portion 53 extending in a direction of the axis O.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flat bottle made of synthetic resin. [Background technology]

[0002] Conventionally, a flat bottle made of synthetic resin has been known as a container for storing contents such as beverages, seasonings, jams, oils, and other foods, and has a mouth, a flat body with a pair of long side walls opposing each other across an axis and a pair of short side walls continuing to both sides of the pair of long side walls, and a bottom that closes the lower end of the body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-160758 Summary of the Invention [Problem to be solved by the invention]

[0004] It has been studied to provide the flat bottle with a panel recessed radially inward on the long side wall. With this flat bottle, when the bottle is cooled after being hot-filled with contents and the mouth is closed with a sealant or cap, the pressure inside the bottle is reduced, and the pressure reduction can be absorbed by the deformation of the panel, thereby mitigating the reduced pressure.

[0005] However, in a flat bottle with a panel portion, when the inside of the bottle is decompressed, one of the short side walls of the long side wall where the panel portion of the body is provided deforms before the other short side wall, and the decompression is released before the other short side wall of the long side wall starts or progresses to deformation, resulting in a problem in which only one of the short side wall portions of the long side wall of the body deforms significantly, resulting in so-called one-sided pulling.

[0006] The present invention is intended to solve these problems, and its object is to provide a flat bottle that can suppress one-sided pulling of the body. [Means for solving the problem]

[0007] The flat bottle of the present invention is a flat bottle made of synthetic resin, comprising a mouth, a flat body portion having a pair of long side wall portions opposed to each other across an axis and a pair of short side wall portions continuous with both sides of the pair of long side wall portions, and a bottom portion closing the lower end of the body portion, and wherein the long side wall portions are provided with panel portions that are recessed radially inward, and the cross-sectional shape of the body portion perpendicular to the axis at the portion where the panel portions are provided has a short side curved portion that extends from the short side wall portion and is convex radially outward, a panel side curved portion that extends from the panel portion and is convex radially outward, and a connecting portion that is linear or convex radially inward and connects the short side curved portion and the panel side curved portion, Department and The connecting portion with the connecting portion is a ridge portion extending in the direction of the axis. The connecting portion between the panel-side curved portion and the connecting portion is a panel bent portion that curves gradually away from the ridge line portion toward the center in the vertical direction. It is characterized by the presence of

[0010] In the flat bottle of the present invention, in the above configuration, it is preferable that the upper end of the panel bend portion is connected to the upper end of the ridge portion and the lower end of the panel bend portion is connected to the lower end of the ridge portion.

[0011] In the flat bottle of the present invention having the above-described configuration, the ridge line is preferably a straight line parallel to the axis or a curved line convex radially inward.

[0012] In the flat-shaped bottle of the present invention, in the above-mentioned configuration, it is preferable that the body portion has a concave rib extending circumferentially above the panel portion, and the portion of the body portion above the concave rib has a pair of crushed wall portions each having a curved shape convex radially outward, facing each other across the axis, and connected at their lower end portions at both ends on the short side wall portion side, and a pair of connecting side wall portions facing each other across the axis and disposed between the pair of crushed wall portions, and that bend portions are provided between one of the crushed wall portions and the pair of connecting side wall portions, and between the other crushed wall portion and the pair of connecting side wall portions, the bend portions extending from the lower end portions of both ends on the short side wall portion side of the crushed wall portions, and the distance between them across the axis gradually decreases from top to bottom. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a flat bottle that can suppress one-sided pulling of the body. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view of a flat bottle according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a side view of the flat bottle shown in FIG. [Figure 3] FIG. 2 is a bottom view of the flat bottle shown in FIG. 1. [Figure 4] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line CC in FIG. [Figure 7] 7 is an enlarged cross-sectional view showing a range D in FIG. 6 in an enlarged manner. [Figure 8] 8 is an enlarged cross-sectional view of a modified example of the connecting portion and the ridge line portion shown in FIG. 7. [Figure 9] 8 is an enlarged cross-sectional view of another modified example of the connecting portion and the ridge line portion shown in FIG. 7. FIG. [Figure 10]FIG. 10 is a front view of a flat bottle according to another embodiment of the present invention. [Figure 11] FIG. 11 is a side view of the flat bottle shown in FIG. 10. [Figure 12] FIG. 11 is a cross-sectional view taken along line EE in FIG. [Figure 13] 13 is an enlarged cross-sectional view showing a range F in FIG. 12 in an enlarged manner. [Figure 14] FIG. 11 is a cross-sectional view taken along line GG in FIG. [Figure 15] FIG. 11 is a cross-sectional view taken along line HH in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] A flat bottle 1 according to an embodiment of the present invention will now be described in more detail with reference to the drawings.

[0016] In this specification and claims, the up-down direction refers to the upper and lower directions when the flat-shaped bottle 1 is in an upright position as shown in Fig. 1. The radially outward direction refers to the direction extending outward along a straight line passing through the axis O of the flat-shaped bottle 1 in Fig. 1 and perpendicular to the axis O, and the radially inward direction refers to the opposite direction. The circumferential direction refers to the direction around the axis O.

[0017] 1, 2, and 3, a flat bottle 1 according to an embodiment of the present invention can be used to store beverages, seasonings, jams, oils, and other foods. However, the flat bottle 1 can also be used to store other contents.

[0018] The flat bottle 1 is a blow-molded product made of synthetic resin, formed by blow molding (extrusion blow molding) of a cylindrical parison formed by extrusion molding. The flat bottle 1 can be formed not only by extrusion blow molding, but also by biaxially stretching blow molding a preform formed by injection molding or the like. The flat bottle 1 can be made of synthetic resin, such as PET (polyethylene terephthalate resin), PP (polypropylene resin), PE (polyethylene resin), nylon (polyamide resin), and EVOH (ethylene-vinyl alcohol copolymer resin).

[0019] The flat bottle 1 has a bottle shape including a mouth portion 10, a body portion 20, and a bottom portion 40.

[0020] The mouth 10 is formed in a cylindrical shape centered on the axis O of the flat bottle 1, and its tip serves as a spout for the contents. The mouth 10 may be closed, for example, by welding an aluminum seal (a sealing material made by laminating a synthetic resin film and an aluminum film). An annular protrusion 11 is integrally formed on the outer periphery of the mouth 10, and a cap (not shown) can be fixed to this annular protrusion 11 through undercut engagement by stoppering, thereby closing the mouth 10 with the cap. In addition, a neck ring 12 extending intermittently in the circumferential direction is integrally formed below the annular protrusion 11 of the mouth 10.

[0021] It is also possible to provide a male thread on the outer peripheral surface of the mouth portion 10 instead of the annular protrusion 11, and to fix the cap to the male thread by threaded engagement. The neck ring 12 may be an annular shape that extends continuously around the entire circumference, or may not be provided at all.

[0022] The body 20 has a flat shape, including a pair of long side walls 21 facing each other across the axis O of the flat-shaped bottle 1, and a pair of short side walls 22 continuing to both sides of the pair of long side walls 21. That is, the width of the long side walls 21 (width in the left-right direction as shown in FIG. 1) is greater than the width of the short side walls 22 (width in the left-right direction as shown in FIG. 2), and as shown in FIG. 3, the body 20 has a flat shape in which the distance between the pair of long side walls 21 is narrower than the distance between the pair of short side walls 22 when viewed from the direction of the axis O. The interior of the body 20 forms a storage space, and the above-mentioned contents can be stored in the storage space.

[0023] A panel portion 23 is provided on each long side wall portion 21. The panel portion 23 has a substantially rectangular shape in a front view, having an upper side 23a, a lower side 23b, and a pair of side sides 23c, and is recessed radially inward with respect to the outer surface of the long side wall portion 21.

[0024] In this embodiment, the body portion 20 is provided with a pair of upper recessed ribs 24 extending in the circumferential direction above the panel portion 23, and a pair of lower recessed ribs 25 extending in the circumferential direction below the panel portion 23. One upper recessed rib 24 is provided above the panel portion 23 of one long side wall portion 21, and the other upper recessed rib 24 is provided above the panel portion 23 of the other long side wall portion 21. One lower recessed rib 25 is provided below the panel portion 23 of one long side wall portion 21, and the other lower recessed rib 25 is provided below the panel portion 23 of the other long side wall portion 21. The circumferential lengths of the pair of recessed ribs 24 and the pair of recessed ribs 25 are each longer than the circumferential length of the panel portion 23. As shown in Figure 4, the pair of recessed ribs 24 are each groove-shaped with a substantially constant depth that is recessed radially inward from the surface of the long side wall portion 21, and as shown in Figure 5, the pair of recessed ribs 25 are each groove-shaped with a substantially constant depth that is recessed radially inward from the surface of the long side wall portion 21.

[0025] As shown in FIG. 1, the body portion 20 has a narrowed shape in a front view, with the portion between the upper recessed rib 24 and the lower recessed rib 25 being narrowest at the center in the up-down direction.

[0026] The portion of the body 20 above the upper recessed rib 24 has a pair of upper crushable walls 26, a pair of upper connecting side walls 27, and a pair of upper bent portions 28. Each of the pair of upper crushable walls 26 has a curved shape that convexly extends radially outward and a trapezoidal shape that convexly extends upward in front or rear view. The pair of upper crushable walls 26 face each other across the axis O, and their lower ends are connected at both ends on the short side wall 22 side. The pair of upper connecting side walls 27 each have a substantially triangular shape in plan view, and are disposed between the pair of upper crushable walls 26, facing each other across the axis O. The pair of upper bent portions 28 are provided between one upper crushing wall portion 26 and the pair of upper connecting side walls 27, and between the other upper crushing wall portion 26 and the pair of upper connecting side walls 27, and extend from the lower end portions of both ends on the short side wall portion 22 side of the upper crushing wall portion 26, respectively, and extend so that the distance between them about the axis O gradually decreases from above to below. As shown in Fig. 4, the connecting point P1 of the lower end portions of the pair of upper crushing wall portions 26 has a pointed shape (an arc shape with a radius sufficiently smaller than that of the pair of upper crushing wall portions 26), and the cross-sectional shape of the lower edge of the pair of upper crushing wall portions 26 perpendicular to the axis O of the body portion 20 is what is called a cat's eye shape.

[0027] Similarly, the portion of the body 20 below the lower recessed rib 25 has a pair of lower crushable wall portions 29, a pair of lower connecting side wall portions 30, and a pair of lower bent portions 31. Each of the pair of lower crushable wall portions 29 has a curved shape that convexly extends radially outward and a trapezoidal shape that convexly extends downward in front or rear view. The pair of lower crushable wall portions 29 face each other across the axis O, and their upper ends are connected at both ends on the short side wall portion 22 side. The pair of lower connecting side wall portions 30 are each approximately triangular in plan view, and are disposed between the pair of lower crushable wall portions 29, facing each other across the axis O. The pair of lower bent portions 31 are provided between one lower crushable wall portion 29 and the pair of lower connecting side walls 30, and between the other lower crushable wall portion 29 and the pair of lower connecting side walls 30, and extend from the upper end portions of both ends on the short side wall portion 22 side of the lower crushable wall portion 29, respectively, and extend so that the distance between them about the axis O gradually decreases from bottom to top. As shown in Figures 3 and 5, the connecting point P2 of the lower end portions of the pair of lower crushable wall portions 29 has a pointed shape (an arc shape with a radius sufficiently smaller than that of the pair of lower crushable wall portions 29), and the cross-sectional shape of the lower edge of the pair of lower crushable wall portions 29 perpendicular to the axis O of the body portion 20 is what is called a cat's eye shape.

[0028] Because the portion of body 20 above upper recessed rib 24 and the portion below lower recessed rib 25 are configured as described above, the pair of upper crushable walls 26 can be pressed radially inward and inverted so as to convex toward the inside of the container starting from upper bent portion 28, and the pair of lower crushable walls 29 can be pressed radially inward and inverted so as to convex toward the inside of the container starting from lower bent portion 31, thereby crushing the pair of long side walls 21 so that they overlap each other. In this way, body 20 can be easily crushed and deformed into a thin shape after the contents have been poured out.

[0029] The bottom portion 40 is integrally connected to the lower end of the body portion 20 and functions as a closing portion that closes the lower end of the body portion 20. As shown in Fig. 3, the central portion of the bottom portion 40 has a recessed portion 41 that is recessed upward in a dome shape, and this recessed portion 41 is provided with a cut-off portion 42 for the parison during extrusion blow molding.

[0030] As shown in Figure 6, the cross-sectional shape perpendicular to the axis O of the body 20 at the part where the panel portion 23 is provided has a short side curved portion 50 that extends from the side of the short side wall portion 22 and is convex radially outward, a panel side curved portion 51 that extends from the side of the panel portion 23 and is convex radially outward, and a connecting portion 52 that is linear or convex radially inward and connects the short side curved portion 50 and the panel side curved portion 51.

[0031] 7, an area A surrounded by a two-dot chain line in Fig. 6 is enlarged, and in this embodiment, in a cross section perpendicular to the axis O, the connecting portion 52 is curved in a convex shape facing radially inward, and is smoothly and integrally connected to the panel-side curved portion 51. Meanwhile, the connecting portion 52 is integrally connected to the short-side curved portion 50 via an arc-shaped portion whose radius is sufficiently smaller than those of the short-side curved portion 50 and the connecting portion 52, and this connection portion forms a ridge line portion 53. That is, in this embodiment, the connection portion between the short-side curved portion 50 and the connecting portion 52 forms the ridge line portion 53.

[0032] As shown in FIG. 1 , the ridge line portion 53 of the body 20 extends in the direction of the axis O, i.e., in the vertical direction, to form the side edge 23 c of the panel portion 23. More specifically, the ridge line portion 53 forms a straight line parallel to the axis O and extends in the vertical direction to form the side edge 23 c of the panel portion 23. The ridge line portion 53 has a cross-sectional shape perpendicular to the axis O that is an arc with a radius sufficiently smaller than that of the short-side curved portion 50 and the connecting portion 52. Therefore, the rigidity of the side edge 23 c of the panel portion 23 that forms the ridge line portion 53 against bending in a direction perpendicular to the axis O (buckling strength against a vertical load) is higher than the rigidity of other parts of the panel portion 23. Note that, in the side view shown in FIG. 2 , the ridge line portion 53 is preferably provided near the center position between the axis O and the portion of the long-side wall portion 21 farthest from the axis O, but outside the range between the center position and the axis O.

[0033] In the flat-shaped bottle 1 of this embodiment having the above-mentioned configuration, a panel portion 23 is provided on each long side wall portion 21 of the body portion 20, so that the contents are heated to a predetermined temperature and hot-filled into the inside of the flat-shaped bottle 1, the mouth portion 10 is closed with a cap, and then the bottle is cooled.As a result, when the inside of the flat-shaped bottle 1 becomes decompressed, the decompression can be absorbed by deformation of the panel portion 23, thereby alleviating the decompression state.

[0034] In the flat-shaped bottle 1 of this embodiment having the above-described configuration, the side edges 23c on both sides of the pair of panel portions 23 provided on each long-side wall portion 21 of the body portion 20 are each configured as a ridge portion 53 to increase rigidity, so that the ridge portions 53 prevent the body portion 20 from deforming radially inward due to reduced pressure, while preferentially deforming only the panel portions 23 radially inward. This allows the panel portions 23 to sufficiently absorb reduced pressure, preventing the occurrence of so-called one-sided pulling, in which one short-side wall portion 22 of the long-side wall portion 21 of the body portion 20 deforms more than the other short-side wall portion 22, when the inside of the flat-shaped bottle 1 is depressurized.

[0035] Furthermore, as described above, in the flat-shaped bottle 1 of this embodiment, the panel portion 23 can sufficiently absorb reduced pressure, making it possible to make the wall thickness of the flat-shaped bottle 1 thinner than conventional bottles, thereby reducing the amount of synthetic resin material used.

[0036] Furthermore, in the flat-shaped bottle 1 of this embodiment, the connection portion between the short side curved portion 50 and the connecting portion 52 is made to be the ridge portion 53, so that the side edge 23c of the panel portion 23 functions as the ridge portion 53, reliably supporting the long side wall portion 21 of the body portion 20 by the ridge portion 53 while making the panel portion 23 more easily deformable.When the inside of the flat-shaped bottle 1 becomes decompressed, the decompression is effectively absorbed by the deformation of the panel portion 23, and the occurrence of so-called one-sided pulling can be more reliably prevented.

[0037] Furthermore, in the flat-shaped bottle 1 of this embodiment, the ridge portion 53 is made straight and parallel to the axis O, making the ridge portion 53 more rigid, and more reliably preventing the occurrence of so-called one-sided pulling, in which one short-side wall portion 22 side of the long-side wall portion 21 of the body 20 deforms more than the other short-side wall portion 22 side, when the inside of the flat-shaped bottle 1 is in a reduced pressure state.

[0038] Furthermore, in the flat bottle 1 of this embodiment, the body 20 is provided with a recessed rib 24 extending in the circumferential direction above the panel portion 23, and the portion of the body 20 above the recessed rib 24 is formed of a pair of upper crushable wall portions 26 each having a convex curved shape directed radially outward, facing each other across the axis O, and having lower end portions connected to each other at both ends on the short side wall portion 22 side, and a pair of upper connecting side walls 26 each facing each other across the axis O and disposed between the pair of upper crushable wall portions 26. The upper crushable wall portion 26 has upper bent portions 27, and between one upper crushable wall portion 26 and the pair of upper connecting side wall portions 27, and between the other upper crushable wall portion 26 and the pair of upper connecting side wall portions 27, upper bent portions 28 are provided which extend from the lower end portions of both ends on the short side wall portion 22 side of the upper crushable wall portion 26 and whose spacing about the axis O gradually decreases from top to bottom, forming a so-called cat's eye shape in plan view, so that the body portion 20 can be easily crushed and deformed into a thin shape after the contents have been poured out. Furthermore, if the body 20 has a so-called cat's eye shape when viewed in a plane, when the inside of the flat-shaped bottle 1 is reduced in pressure, so-called one-sided pulling is likely to occur, in which one short side wall 22 side of the long side wall 21 of the body 20 is deformed more than the other short side wall 22 side. However, as described above, each ridge portion 53 can prevent the body 20 from deforming radially inward due to reduced pressure. Therefore, even if the body 20 has a so-called cat's eye shape when viewed in a plane, so-called one-sided pulling, in which one short side wall 22 side of the long side wall 21 of the body 20 is deformed more than the other short side wall 22 side, can be reliably prevented from occurring when the inside of the flat-shaped bottle 1 is reduced in pressure.

[0039] Fig. 10 is a front view of a flat bottle according to another embodiment of the present invention, Fig. 11 is a side view of the flat bottle shown in Fig. 10, Fig. 12 is a cross-sectional view taken along line EE in Fig. 10, Fig. 13 is an enlarged cross-sectional view showing range F in Fig. 12, Fig. 14 is a cross-sectional view taken along line GG in Fig. 10, and Fig. 15 is a cross-sectional view taken along line HH in Fig. 10. In Figs. 10 to 15, members corresponding to those previously described are designated by the same reference numerals, and repeated explanations will be omitted where appropriate.

[0040] As shown in Figures 10 to 15 as another embodiment, the flat bottle 1 of the present invention comprises a mouth portion 10, a flat body portion 20 having a pair of long side wall portions 21 facing each other across an axis O and a pair of short side wall portions 22 continuing to both sides of the pair of long side wall portions 21, and a bottom portion 40 closing the lower end of the body portion 20, and the long side wall portions 21 are provided with panel portions 23 that are recessed radially inward, and the cross-sectional shape of the body portion 20 at the portion where the panel portions 23 are provided is perpendicular to the axis O and extends from the side of the short side wall portions 22. In a configuration having a short side curved portion 50 that is convex radially outward, a panel side curved portion 51 that is convex radially outward and extends from the side of the panel portion 23, and a connecting portion 52 that is linear or convex radially inward and connects the short side curved portion 50 and the panel side curved portion 51, and the connecting portion between the short side curved portion 50 and the connecting portion 52 forms a ridge portion 53 extending in the direction of the axis O, the connecting portion between the panel side curved portion 51 and the connecting portion 52 can further be configured to form a panel bending portion 60.

[0041] Here, each panel bending portion 60 has a curved shape that gradually moves away from ridge line portion 53 toward the center in the vertical direction. That is, the distance (width of connecting portion 52) between ridge line portion 53 and panel bending portion 60 at the center in the vertical direction of ridge line portion 53 shown in Fig. 13 is larger than the distance (width of connecting portion 52) between ridge line portion 53 and panel bending portion 60 at the upper end side in the vertical direction of ridge line portion 53 shown in Fig. 14 and the distance (width of connecting portion 52) between ridge line portion 53 and panel bending portion 60 at the lower end side in the vertical direction of ridge line portion 53 shown in Fig. 15.

[0042] In the illustrated example, the upper end of the panel bending portion 60 is connected to the upper end of the ridge line portion 53, and the lower end of the panel bending portion 60 is connected to the lower end of the ridge line portion 53, so that the panel bending portion 60 has a vertically symmetrical shape curved in an arch shape between the upper and lower ends when viewed from the front. The panel bending portion 60 has a convex shape facing radially inward, and can bend more easily than the ridge line portion 53 in a direction narrowing the angle formed by the panel-side curved portion 51 and the connecting portion 52.

[0043] In the flat-shaped bottle 1 according to this other embodiment, similar to the flat-shaped bottle 1 shown in Figure 1, both side edges 23c of a pair of panel portions 23 are each configured as ridge portions 53 to increase rigidity, and each ridge portion 53 prevents the body portion 20 from deforming radially inward due to reduced pressure, while allowing only the panel portions 23 to preferentially deform radially inward.In addition, by providing the panel bending portion 60, the panel bending portion 60 bends when reduced pressure is applied, and the entire connecting portion 52 surrounded by the ridge portions 53 and the panel bending portion 60 deforms so as to fall toward the inside of the container, thereby reducing the difference in time between deformation of one side edge 23c of the panel portion 23 and deformation of the other side edge 23c of the panel portion 23. This allows the panel portion 23 to fully absorb the reduced pressure, and more effectively prevents the occurrence of so-called one-sided pulling, in which one short side wall portion 22 of the long side wall portion 21 of the body portion 20 deforms more than the other short side wall portion 22 when the inside of the flat-shaped bottle 1 is depressurized. Furthermore, if the connecting portion 52 deforms and falls inward toward the container by more than a certain amount, the panel bending portion 60 acts like a beam, thereby suppressing further deformation of the connecting portion 52.

[0044] In the illustrated case, the upper end of the panel bending portion 60 is connected to the upper end of the ridge line portion 53, and the lower end of the panel bending portion 60 is connected to the lower end of the ridge line portion 53, so that when the pressure is reduced, the bending of the panel bending portion 60 causes the entire connecting portion 52 surrounded by the ridge line portion 53 and the panel bending portion 60 to deform so as to more easily fall toward the inside of the container, more effectively preventing the occurrence of so-called one-sided pulling. Note that it is also possible to configure the ridge line portion 53 and the panel bending portion 60 at their upper ends without connecting them, and instead provide the connecting portion 52 between them.

[0045] In the other embodiments described above, connecting portion 52 may be either linear or convex radially inward, but is preferably linear. By making connecting portion 52 linear, when pressure is reduced, the entire connecting portion 52 surrounded by ridge portion 53 and panel bent portion 60 is more easily deformed so as to collapse toward the inside of the container due to bending of panel bent portion 60, and the occurrence of so-called one-sided pulling can be more effectively prevented.

[0046] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

[0047] For example, in the above embodiment, the connecting portion 52 has a convex shape facing radially inward in a cross section perpendicular to the axis O, as shown in Figure 7, but this is not limited to this, and the connecting portion 52 may have a linear shape in a cross section perpendicular to the axis O, as shown in Figure 8.

[0048] In addition, in the above embodiment, as shown in Figure 7, the connection portion between the short side curved portion 50 and the connecting portion 52 in a cross section perpendicular to the axis O is configured to be a ridge portion 53. However, as shown in Figure 9, the short side curved portion 50 and the connecting portion 52 may be smoothly connected, and the connection portion between the panel side curved portion 51 and the connecting portion 52 may be configured to be an arc-shaped portion with a radius sufficiently smaller than that of the panel side curved portion 51 and the connecting portion 52, forming the ridge portion 53.

[0049] Furthermore, in the above embodiment, the ridge line portion 53 is formed in a shape that extends linearly in the vertical direction, but it may also be formed in a curved shape that protrudes radially inward.

[0050] Furthermore, the body portion 20 is not limited to a shape that is constricted between the recessed ribs 24 and 25, but may have a shape with a constant width or may be barrel-shaped. [Explanation of symbols]

[0051] 1 Flat bottle 10 Mouth 11 Annular protrusion 12 Neck Ring 20 Torso 21 Long side wall 22 Short side wall 23 Panel section 23a Top 23b bottom edge 23c side 24 concave rib 25 concave rib 26 Upper crushing wall 27 Upper connecting side wall 28 Upper bend 29 Lower crushed wall 30 Lower connecting side wall 31 Lower bend 40 bottom 41 Recess 42 Food cutting section 50 Short side curved section 51 Panel side curved section 52 Connecting part 53 Ridgeline 60 Panel bending part O axis P1 connection point P2 connection point A range

Claims

1. A flat bottle made of synthetic resin, comprising: a mouth; a flat body portion having a pair of long side wall portions opposed to each other across an axis and a pair of short side wall portions connected to both sides of the pair of long side wall portions; and a bottom portion closing the lower end of the body portion, wherein the long side wall portions are provided with panel portions recessed radially inward, The cross-sectional shape perpendicular to the axis of the body portion at the portion where the panel portion is provided is a short-side curved portion extending from the short-side wall portion and convex outward in the radial direction; a panel-side curved portion extending from the panel portion and convex outward in the radial direction; a connecting portion that is linear or convex toward the inside in the radial direction, connecting the short-side curved portion and the panel-side curved portion; a connecting portion between the short-side curved portion and the connecting portion is a ridge portion extending in the direction of the axis, A flat bottle characterized in that the connection portion between the panel side curved portion and the connecting portion is a panel bent portion that curves gradually away from the ridge portion as it approaches the center in the vertical direction.

2. The flat bottle according to claim 1 , wherein the upper end of the ridge line portion is connected to the upper end of the panel bend portion, and the lower end of the panel bend portion is connected to the lower end of the ridge line portion.

3. The flat bottle according to claim 1 or 2, wherein the ridge portion is a straight line parallel to the axis or a curved line convex radially inward.

4. The body portion includes a recessed rib extending in a circumferential direction above the panel portion, A portion of the body portion above the concave rib a pair of crushing wall portions each having a curved shape convex outward in the radial direction, facing each other across the axis, and having lower end portions connected to each other at both ends on the short side wall portion side; a pair of connecting side wall portions that face each other across the axis and are disposed between the pair of crushing wall portions, 4. The flat bottle according to claim 1, wherein between one of the crushable wall portions and the pair of connecting side wall portions, and between the other of the crushable wall portions and the pair of connecting side wall portions, there are provided bent portions extending from the lower end portions of both ends on the short side wall portion side of the crushable wall portion, and the distance between them across the axis gradually decreases from top to bottom.

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