Flat bottle

Abstract

To provide a flat-shaped bottle capable of suppressing one-side pulling of a trunk part.SOLUTION: A flat-shaped bottle 1 comprises: a panel part 23 on a long side wall part 21 of a trunk part 20; a short side curved part 50 to which a horizontal cross-sectional shape of the trunk part 20 at a portion where the panel part 23 is provided extends from a short side wall part 22 side; a panel side curved part 51 extending from a panel part 23 side; and a linear or radially inwardly projecting connection part 52 connecting the short side curved part 50 with the panel side curved part 51. A connection part between the short side curved part 50 and the connection part 52 is made to be a ridge line part 53. A connection part between the panel side curved part 51 and the connection part 52 is connected to the ridge line part 53 at upper and lower ends, and becomes a panel bent part 54 curved so as to be gradually away from the ridge line part 53 toward a central part in a vertical direction. A radius on a horizontal cross-section of the panel part 23 is larger than a radius on a horizontal cross-section perpendicular to an axis line O in a continuously connecting place with the panel part 23 at the trunk part 20.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 have a cross section perpendicular to the axis that is an arc shape that is convex radially outward, and the cross section perpendicular to the axis of the body portion at the portion where the panel portions are provided has a short side curved portion that is convex radially outward extending from the short side wall portion, and a connecting portion that is linear or that is convex toward the inside in the radial direction and connects the short side curved portion and the panel side curved portion, a connecting portion that is linear or that is convex toward the inside in the radial direction and connects 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 that extends in the direction of the axis, a connecting portion between the panel side curved portion and the connecting portion is a panel bent portion that is connected to the ridge portion at an upper end and a lower end and curves so as to gradually move away from the ridge portion toward the center in the up-down direction, and a radius of the panel portion in a cross section perpendicular to the axis is the top of The radius of the cross section perpendicular to the axis at the connection point and the radius of the cross section perpendicular to the axis at the connecting point of the body portion with the lower end of the panel portion. is characterized by being larger than

[0008] In the flat bottle of the present invention having the above-mentioned configuration, it is preferable that the ratio of the amount of projection of the panel portion toward the outside in the radial direction to the width at the center in the vertical direction is 0.15 or less.

[0009] In the flat bottle of the present invention, in the above-described configuration, it is preferable that the long side wall portion has an inclined shape such that the portion between the upper end and the vertical center and the portion between the lower end and the vertical center are located radially inward relative to the upper end or the lower end, respectively.

[0010] In the flat-shaped bottle of the present invention, in the above-mentioned configuration, it is preferable that the cross-sectional shape perpendicular to the axis of the body portion at the portion where the panel portion is provided has tip bent portions at both ends on the side of the pair of short side wall portions.

[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 convexly directed radially outward, facing each other across the axis, and connected at their lower ends 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 upper bent 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, respectively, which extend 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] FIG. 8 is an enlarged cross-sectional view of a modified example of the connecting portion shown in FIG. [Figure 9] FIG. 2 is a cross-sectional view taken along line EE in FIG. [Figure 10] FIG. 2 is a cross-sectional view taken along the line FF in FIG. [Figure 11] 2 is a partially cutaway front view of the flat bottle shown in FIG. 1 with a cap attached to the mouth portion by plugging. [Figure 12] FIG. 10 is a front view of a flat bottle according to a modified example. [Figure 13] FIG. 10 is a side view of a flat bottle according to a modified example. [Figure 14] FIG. 13 is a cross-sectional view taken along line GG 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 one 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-shaped bottle 1, and its tip serves as a spout for the contents. An annular protrusion 11 is integrally formed on the outer periphery of the mouth 10, and by fastening a cap C (see Figure 11) to this annular protrusion 11 through undercut engagement by stoppering, the mouth 10 can be closed with the cap C. 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 portion between the upper recessed rib 24 and the lower recessed rib 25 of the short-side wall portion 22 is constricted so that the vertical center portion is located at the innermost position in the radial direction. As shown in Fig. 2, the portion between the upper end and the vertical center portion of the long-side wall portion 21 and the portion between the lower end and the vertical center portion are inclined so that the vertical center portions are located radially inner than the upper end or the lower end, respectively.

[0026] The portion of the body 20 above the upper recessed rib 24 has a pair of upper crushable wall portions 26, a pair of upper connecting side wall portions 27, and a pair of upper bent portions 28. Each of the pair of upper crushable wall portions 26 has a curved shape that convexly extends radially outward and a trapezoidal shape that convexly extends upward in a front or rear view. The pair of upper crushable wall portions 26 face each other across the axis O, and their lower ends are connected at both ends on the short side wall portion 22 side. The pair of upper connecting side wall portions 27 each have a substantially triangular shape in a plan view, and are disposed between the pair of upper crushable wall portions 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-like 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 crushing wall portion 29 and the pair of lower connecting side walls 30, and between the other lower crushing 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 crushing 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 crushing wall portions 29 has a pointed shape (an arc shape with a radius sufficiently smaller than that of the pair of lower crushing wall portions 29), and the cross-sectional shape of the lower edge of the pair of lower crushing 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 wall portions 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 wall portions 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 wall portions 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] Bottom portion 40 is integrally connected to the lower end of body portion 20 and functions as a closing portion that closes the lower end of body portion 20. As shown in Fig. 3, the central portion of bottom portion 40 has a recess 41 that is recessed upward in a dome shape, and recess 41 is provided with a protrusion 42 that protrudes downward to prevent bottom from falling.

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

[0031] 7, an area D surrounded by a two-dot chain line in Fig. 6 is enlarged, and in this embodiment, the connecting portion 52 is linear in a cross section perpendicular to the axis O. The short-side curved portion 50 is smoothly and integrally connected to the connecting portion 52 via an arc-shaped connecting portion having a radius sufficiently smaller than that of the short-side curved portion 50 or the panel-side curved portion 51, and this connecting portion forms a ridge portion 53. On the other hand, the panel-side curved portion 51 is smoothly and integrally connected to the connecting portion 52 via an arc-shaped connecting portion having a radius sufficiently smaller than that of the short-side curved portion 50 or the panel-side curved portion 51, and this connecting portion forms a panel bend portion 54.

[0032] The connecting portion 52 is not limited to being linear, but may be curved so as to be convex radially inward, as shown in FIG.

[0033] As shown in FIG. 1 , the ridge line portion 53 of the body portion 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 or the panel-side curved portion 51. 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 in a portion farther from the axis O than the midpoint between the portion of the long-side wall portion 21 farthest from the axis O and the axis O.

[0034] The ridge line portion 53 is not limited to a shape that extends in the vertical direction in a straight line parallel to the axis O, but may be a curved shape that protrudes radially inward.

[0035] 1, each panel bending portion 54 has a curved shape that gradually moves away from ridge line portion 53 toward the center in the vertical direction. That is, the distance between ridge line portion 53 and panel bending portion 54 at the center in the vertical direction of ridge line portion 53 (the width of connecting portion 52) is larger than the distance between ridge line portion 53 and panel bending portion 54 at the upper end side of ridge line portion 53 in the vertical direction (the width of connecting portion 52) and the distance between ridge line portion 53 and panel bending portion 54 at the lower end side of ridge line portion 53 in the vertical direction (the width of connecting portion 52).

[0036] In this embodiment, the upper end of the panel bending portion 54 is connected to the upper end of the ridge line portion 53, and the lower end of the panel bending portion 54 is connected to the lower end of the ridge line portion 53. As a result, the panel bending portion 54 has a vertically symmetrical shape that curves in an arch shape between the upper end and the lower end when viewed from the front. The panel bending portion 54 has a smaller radius than the connecting portion 52 and is curved in a convex shape facing radially inward, so that it 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.

[0037] The panel portion 23 has a shape in which the radius in a cross section perpendicular to the axis O is larger than the radius in a cross section perpendicular to the axis O at a connection point between the panel portion 23 of the body portion 20 and the panel portion 23. More specifically, the radius R1 in a cross section perpendicular to the axis O of the panel portion 23 shown in FIG. 6 is larger at any position in the vertical direction than the radius R2 in a cross section perpendicular to the axis O at a connection point between the upper end of the panel portion 23 of the body portion 20 and the panel portion 23 shown in FIG. 9 and the radius R3 in a cross section perpendicular to the axis O at a connection point between the lower end of the panel portion 23 of the body portion 20 and the panel portion 23 shown in FIG. 10. In this embodiment, the panel portion 23 has a shape in which the radius in a cross section perpendicular to the axis O gradually increases from the upper edge 23a toward the vertical center and gradually increases from the lower edge 23b toward the vertical center. Note that the panel portion 23 may have a shape in which the radius in a cross section perpendicular to the axis O is largest in a portion other than the vertical center.

[0038] The panel portion 23 is connected to the inside of the panel bending portion 54, which is curved in a bow shape between the upper and lower ends, and has a shape in which the radius of the cross section perpendicular to the axis O gradually increases from the upper and lower ends toward the vertical center.As a result, as shown in Figure 2, when viewed from the side, the vertical center has a smoothly curved shape that is located radially inward from the upper edge 23a and the lower edge 23b.

[0039] The ratio P / W of the radially outward protrusion P (the radial protrusion from the straight line connecting both sides 23c to the widthwise center) to the width W at the vertical center of the panel portion 23 is preferably 0.15 or less, and more preferably 0.10 or less. Note that the cross-sectional shape of the panel portion 23 perpendicular to the axis O is not a straight line but an arc shape that is convex radially outward, so P / W is a value greater than 0.

[0040] 6, 9, and 10, the cross-sectional shape perpendicular to the axis O of the body 20 at the portion where the panel portion 23 is provided has tip bent portions 55 at both ends on the side of the pair of short side wall portions 22. The tip bent portions 55 have a pointed, arc-like shape with a radius sufficiently smaller than that of the short side curved portions 50, so that the short side wall portions 22 can be easily bent along the tip bent portions 55.

[0041] The bent tip portion 55 is provided along a parting line that is generated when the flat bottle 1 is blow-molded using a split mold.

[0042] 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.

[0043] 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.

[0044] Furthermore, in the flat bottle 1 of this embodiment, the connection between the panel-side curved portion 51 and the connecting portion 52 is the panel bent portion 54. Therefore, when the pressure is reduced, the panel bent portion 54 bends, causing the entire connecting portion 52, surrounded by the ridge portion 53 and the panel bent portion 54, to deform and tip inward toward the container. This reduces the difference in deformation between the deformation of one side edge 23c of the panel portion 23 and the deformation of the other side edge 23c of the panel portion 23. This allows the panel portion 23 to sufficiently absorb 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 20 deforms more than the other short-side wall portion 22 when the interior of the flat bottle 1 is decompressed. Furthermore, when the connecting portion 52 deforms and tip inward toward the container by a certain amount or more, the panel bent portion 54 acts like a beam, thereby suppressing further deformation of the connecting portion 52.

[0045] Furthermore, in the flat bottle 1 of this embodiment, the upper end of the panel bent portion 54 is connected to the upper end of the ridge line portion 53, and the lower end of the panel bent portion 54 is connected to the lower end of the ridge line portion 53. Therefore, when the pressure is reduced, the bending of the panel bent portion 54 causes the entire connecting portion 52 surrounded by the ridge line portion 53 and the panel bent portion 54 to more easily deform and tip toward the inside of the container, more effectively preventing the occurrence of so-called one-sided pulling. Note that it is also possible to provide a connecting portion 52 between the ridge line portion 53 and the panel bent portion 54 at the upper and lower ends of the ridge line portion 53 without connecting them.

[0046] Furthermore, in the flat-shaped bottle 1 of this embodiment, the connecting portion 52 is made straight, so that when the pressure is reduced, the bending of the panel bending portion 54 causes the entire connecting portion 52 surrounded by the ridge portion 53 and the panel bending portion 54 to more easily deform and fall toward the inside of the container, thereby more effectively preventing the occurrence of so-called one-sided pulling.

[0047] Furthermore, in the flat-shaped bottle 1 of this embodiment, the radius of the cross section perpendicular to the axis O of the panel portion 23 is larger than the radius of the cross section perpendicular to the axis O at the connection point with the panel portion 23 of the body portion 20. Therefore, when the inside of the flat-shaped bottle 1 is in a decompressed state, it is possible to more effectively prevent 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 portion 20 deforms more than the other short-side wall portion 22 side.

[0048] In a comparative flat bottle, in which the radius of the cross section perpendicular to the axis O of the panel portion 23 is not larger than the radius of the cross section perpendicular to the axis O at the joint of the body portion 20 and the panel portion 23, as compared with the flat bottle 1 of this embodiment, when the mouth portion 10 is closed with an aluminum seal or a screw cap, it is possible to prevent the occurrence of so-called one-sided pulling when the internal pressure is reduced. However, when the comparative flat bottle is configured such that a cap C having an inner stopper 60 that seals the mouth portion 10 is attached to the mouth portion 10 by stoppering, as shown in Fig. 11, the inner stopper 60 is inserted into the mouth portion 10 in a sealed state during stoppering, increasing the internal pressure of the container. This pressure deforms the long side wall portions 21 so that they protrude radially outward. After cooling, the outward protrusion reduces the radius of the cross section, increasing resistance to reduced pressure, and only one of the long side wall portions 21 becomes concave, potentially causing the so-called one-sided pulling.

[0049] In contrast, in the flat-shaped bottle 1 of this embodiment, as described above, the radius of the cross section perpendicular to the axis O of the panel portion 23 is larger than the radius of the cross section perpendicular to the axis O at the connection point between the body portion 20 and the panel portion 23.Therefore, even if the long side wall portion 21 is deformed so as to protrude radially outward due to the pressure from stoppering, the radius of the cross section of the long side wall portion 21 is prevented from becoming so small that it prevents the long side wall portion 21 from returning to its original shape, and both long side wall portions 21 can return to their concave state when pressure is reduced, effectively preventing the so-called one-sided pulling from occurring.

[0050] Furthermore, in the flat bottle 1 of this embodiment, the ratio P / W of the radial outward protrusion P to the width W at the vertical center of the panel portion 23 is set to 0.15 or less, so that when the long side wall portion 21 is deformed to protrude outward due to the pressure of stoppering, the radius of the cross section of the long side wall portion 21 is set to a radius that allows the long side wall portion 21 to easily return to its original shape, more effectively preventing the occurrence of so-called one-sided pulling. By setting the ratio P / W of the radial outward protrusion P to the width W at the vertical center of the panel portion 23 to 0.10 or less, the occurrence of so-called one-sided pulling can be even more effectively prevented.

[0051] Furthermore, in the flat-shaped bottle 1 of this embodiment, the long side wall portion 21 is shaped so that the portion between the upper end and the vertical center and the portion between the lower end and the vertical center are inclined so that the vertical center portions are located radially inward relative to the upper end or lower end, respectively.Therefore, when the long side wall portion 21 is deformed so as to protrude outward due to the pressure of the stoppering, the above-mentioned inclination of the long side wall portion 21 is eliminated and the entire long side wall portion 21 becomes flat and parallel to the axis O.As a result, the entire long side wall portion 21 functions as a beam, suppressing the radial outward protrusion of the panel portion 23, and more effectively preventing the occurrence of so-called one-sided pulling.

[0052] Furthermore, in the flat bottle 1 of this embodiment, the cross section perpendicular to the axis O of the body 20 at the portion where the panel 23 is provided has bent tip portions 55 at both ends on the side of the pair of short side walls 22, which makes it easier for the body 20 to deform in a direction that increases or decreases the distance between the pair of long side walls 21 due to bending of the bent tip portions 55. This prevents the panel 23 from protruding radially outward, more effectively preventing the occurrence of so-called one-sided pulling.

[0053] 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.

[0054] 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.

[0055] 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 a 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.

[0056] 12, 13, and 14, the flat bottle 1 of this embodiment may have a cross-sectional shape perpendicular to the axis O of the body 20 at the portion where the panel portion 23 is provided, which does not have the bent tip portions 55 at either end on the side of the pair of short side walls 22. The flat bottle 1 of the modified example shown in FIGS. 12 to 14 has basically the same structure as the flat bottle 1 shown in FIG. 1, except that it does not have the bent tip portions 55, and therefore a detailed description of this same structure will be omitted.

[0057] 14, in the flat-shaped bottle 1 according to the modified example, the cross-sectional shape perpendicular to the axis O of the body 20 at the portion where the panel portion 23 is provided is such that the short-side wall 22 is an arc of a constant radius between a pair of short-side curved portions 50. The connecting portion between the pair of short-side curved portions 50 and the portion of the short-side wall 22 between the pair of short-side curved portions 50 is an arc-shaped connecting bent portion 70 with a smaller radius than the short-side curved portions 50. The pair of connecting bent portions 70 provided on one of the short-side walls 22 are connected to each other at connecting points P1 and P2, and are spaced the widest at the center in the vertical direction, forming a vertical, so-called cat's-eye shape in side view.

[0058] In the flat bottle 1 according to this modification, all of the effects other than those provided by the bent tip portion 55 of the flat bottle 1 shown in FIG. 1 can be achieved.

[0059] 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.

[0060] For example, in the above embodiment, the long side wall portion 21 has an inclined shape in the portion between the upper end and the vertical center and the portion between the lower end and the vertical center so that the vertical center is located radially inward from the upper end or the lower end, but it can also be configured so that it does not have this inclination and is parallel to the axis O.

[0061] In addition, in the above embodiment, the cap C is attached to the mouth portion 10 by plugging, but the cap may also be attached to the mouth portion 10 by screwing, or the mouth portion 10 may be closed with an aluminum seal. [Explanation of symbols]

[0062] 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 Bottom drop prevention protrusion 50 Short side curved section 51 Panel side curved section 52 Connecting part 53 Ridgeline 54 Panel bending part 55 Tip bent part 60 Inner stopper 70 Connecting bend part O axis C Cap P1 connection point P2 connection point D range R1 radius R2 radius R3 radius W width P protrusion amount

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 continuous with 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 that are recessed radially inward and whose cross section perpendicular to the axis has an arc shape that is convex radially outward, 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, The connection portion between the panel-side curved portion and the connecting portion is a panel bent portion that is connected to the ridge line portion at the upper end and the lower end and curves gradually away from the ridge line portion toward the center in the vertical direction, and A flat-shaped bottle characterized in that the radius of the panel portion in a cross section perpendicular to the axis is larger than the radius of the cross section perpendicular to the axis at the point where the panel portion of the body joins the upper end of the panel portion and the radius of the cross section perpendicular to the axis at the point where the panel portion of the body joins the lower end of the panel portion.

2. 2. The flat bottle according to claim 1, wherein the ratio of the amount of projection of the panel portion toward the outside in the radial direction to the width at the center in the vertical direction is 0.15 or less.

3. 3. The flat bottle according to claim 1, wherein the long side wall portion has an inclined shape such that the portion between the upper end and the vertical center and the portion between the lower end and the vertical center are positioned radially inward relative to the upper end or the lower end.

4. 2. The flat bottle according to claim 1, wherein the cross-sectional shape of the body portion perpendicular to the axis at the portion where the panel portion is provided has tip bent portions at both ends on the side of the pair of short side wall portions.

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

6. 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, 2. The flat bottle according to claim 1, wherein upper bent portions are provided 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, the upper bent portions extending from the lower end portions of both ends of the crushable wall portion on the short side wall portion side, and the distance between them across the axis gradually decreases from top to bottom.

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