JP7241600B2 - square bottle - Google Patents

Description

The present invention relates to square bottles.

Conventionally, as shown in Patent Document 1 below, for example, a mouth portion, a shoulder portion, a body portion, and a bottom portion are continuously arranged in this order from top to bottom along the axial direction of the bottle. A plurality of main walls are connected via connecting parts in the circumferential direction along the axis of the bottle so that a cross-sectional view perpendicular to the axis has a square shape, and the main walls are provided with a main wall facing radially inward. A prismatic bottle is known in which an upper panel part that is recessed into a shape and a lower panel part that are spaced apart from each other in the axial direction of the bottle.
The outer peripheral edge of the upper panel portion and the outer peripheral edge of the lower panel portion are opposed to each other in the axial direction of the bottle and extend in the circumferential direction. side edges;

Japanese Utility Model Laid-Open No. 5-77014

However, in the conventional rectangular bottle, stress is applied to the corner portion connecting the inner edge and the side edge of at least one of the outer peripheral edge of the upper panel portion and the outer peripheral edge of the lower panel portion when the inside of the rectangular bottle is decompressed. is concentrated and the main wall portion is locally deformed to a large extent, making it difficult to increase the reduced pressure absorption capacity.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a square bottle that can increase the reduced pressure absorption capacity.

In order to solve the above problems and achieve such objects, the rectangular bottle of the present invention has a mouth portion, a shoulder portion, a body portion, and a bottom portion that extend downward from above along the axial direction of the bottle. A plurality of main wall portions that are successively connected and connected in a circumferential direction along the axis of the bottle via connecting portions so that the body portion has a rectangular cross-sectional view perpendicular to the axis of the bottle, An upper panel portion and a lower panel portion which are recessed radially inwardly are formed on the main wall portion at intervals in the axial direction of the bottle. The peripheral edge includes an inner edge facing each other in the axial direction of the bottle and extending in the circumferential direction, and a pair of side edges separately extending in the axial direction of the bottle from both circumferential ends of the inner edge. The portion has an arch shape that integrally surrounds the inner edge of at least one of the upper panel portion and the lower panel portion and a portion of the side edge that is connected to at least the inner edge. A groove is formed, and the arch-shaped groove is located at both ends in the circumferential direction and extends in the axial direction of the bottle. and a curved portion that surrounds the inner edge in the axial direction of the bottle, and both ends of the curved portion in the circumferential direction connect the inner edge and the side edge. The curved portion is located outside the corner portion in the circumferential direction, and the size of the curved portion in the circumferential direction is that of the panel portion of the upper panel portion and the lower panel portion surrounded in the axial direction of the bottle by the arch-shaped groove. It is larger than the size in the circumferential direction .

According to this invention, since the arch-shaped groove is formed in the main wall, it is possible to increase the rigidity of the main wall. It is possible to suppress concentration of stress on the first corner portion connecting the inner edge and the side edge of at least one of the outer peripheral edges of the portion.
Since both ends of the curved portion of the arch-shaped groove in the circumferential direction are located outside the first corner portion connecting the inner edge and the side edge in the circumferential direction, the curved portion and the straight portion of the arch-shaped groove are aligned. It is possible to provide the second corner portion connecting the and at a position spaced apart from the first corner portion, and when the pressure inside the rectangular bottle is reduced, the vicinity of the first corner portion, where stress tends to concentrate on the main wall portion, is locally It is possible to suppress the deformation to a large extent.
As described above, when the pressure inside the rectangular bottle is depressurized, it is possible to suppress the occurrence of a portion that is locally greatly deformed in the main wall portion due to the concentration of stress on the first corner portion. Capacity can be increased.

Here, the inner edge may extend straight in the circumferential direction.

In this case, the inner edge extends straight in the circumferential direction, and although the stress tends to concentrate on the first corner portion connecting the inner edge and the side edge, as described above, Since it is possible to suppress the occurrence of locally large deformation portions in the main wall portion, the reduced pressure absorption capacity can be effectively increased.

Further, the arch-shaped groove may surround half or more of the length of the side edge in the axial direction of the bottle from the outside in the circumferential direction.

In this case, since the arch-shaped groove surrounds more than half of the length of the side edge in the axial direction of the bottle from the outside in the circumferential direction, the portion of the main wall portion located inside the arch-shaped groove is defined by the arch. Almost the entire area, including the upper panel portion or the lower panel portion, which is surrounded by the grooves, can be deformed radially inward when the pressure inside the rectangular bottle is reduced, increasing the vacuum absorption capacity of the rectangular bottle. can definitely be increased.

In addition, when viewed from the outside in the radial direction, the radius of curvature of the inner peripheral edge of the second corner portion connecting the curved portion and the straight portion is the first corner portion connecting the inner edge and the side edge. may be greater than the radius of curvature of

In this case, when viewed from the outside in the radial direction, the radius of curvature of the inner peripheral edge of the second corner portion connecting the curved portion and the straight portion is the radius of curvature of the first corner portion connecting the inner edge and the side edge. Since it is larger, it is possible to reliably prevent the arch-shaped groove from breaking when the pressure inside the rectangular bottle is reduced, and the portion of the main wall portion located inside the second corner portion of the arch-shaped groove. , stress concentration can be suppressed. As a result, when the inside of the rectangular bottle is decompressed, the portion of the main wall located inside the arch-shaped groove can be easily deformed inward in the radial direction. can be definitely increased.

According to the present invention, the reduced pressure absorption capacity can be increased.

1 is a side view of a long-side main wall portion of a rectangular bottle shown as an embodiment of the present invention, viewed from the front. FIG.

A rectangular bottle 1 according to an embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the rectangular bottle 1 is constructed by connecting a mouth portion 11, a shoulder portion 12, a body portion 13, and a bottom portion 14 in this order from top to bottom along the direction of the bottle axis O. It is
Hereinafter, when viewed from above and below, the direction intersecting the bottle axis O is referred to as the radial direction, and the direction rotating around the bottle axis O is referred to as the circumferential direction.

The rectangular bottle 1 is formed by blow-molding a preform formed into a cylindrical shape with a bottom by injection molding, and is integrally formed of a synthetic resin material such as polyethylene terephthalate or polypropylene. A cap (not shown) is attached to the mouth portion 11 .
The internal volume of the square bottle 1 is set to a size that allows it to be filled with contents of, for example, 200 ml or more and 4000 ml or less. In the illustrated example, the rectangular bottle 1 is sized to be filled with 1000 ml of content.

The barrel portion 13 includes a plurality of main wall portions 15 and 16 connected in the circumferential direction via a connecting portion 17 so that a cross-sectional view orthogonal to the bottle axis O has a rectangular shape. The outer peripheral surfaces of the main walls 15 and 16 each extend substantially straight when viewed in a cross section perpendicular to the bottle axis O. The connecting portion 17 has a width in the circumferential direction and is formed in a strip shape extending in the vertical direction. Note that the connecting portion 17 may be a vertex portion having no width in the circumferential direction.

The body portion 13 has a rectangular shape in a cross-sectional view orthogonal to the bottle axis O, and is configured by connecting a main wall portion 15 on a long side and a main wall portion 16 on a short side through a connecting portion 17 . there is In the illustrated example, the circumferential length of the main wall portion 16 on the short side is longer than half the length of the main wall portion 15 on the long side in the circumferential direction. The shoulder portion 12 and the bottom portion 14, like the body portion 13, also have a rectangular cross-sectional view orthogonal to the bottle axis O. As shown in FIG.

An upper panel portion 18 and a lower panel portion 19 which are recessed radially inward are formed on the main wall portions 15 and 16 at intervals in the bottle axis O direction. A circumferential groove 21 extending continuously over the entire length in the circumferential direction is formed in a portion of the body portion 13 located between the upper panel portion 18 and the lower panel portion 19 . The circumferential groove 21 is formed in the central portion of the barrel portion 13 in the bottle axis O direction. A finger contact concave portion 21 a deeper than the depth of the circumferential groove 21 is provided in a portion of the circumferential groove 21 located in the main wall portion 15 on the long side. The finger rest concave portion 21a is arranged in the central portion of the main wall portion 15 on the long side.

The outer peripheral edge of the upper panel portion 18 and the outer peripheral edge of the lower panel portion 19 provided on the main wall portion 15 on the long side face each other in the direction of the bottle axis O and extend in the circumferential direction with inner edges 18a and 19a. , and a pair of side edges 18b, 19b respectively extending in the direction of the bottle axis O from both circumferential ends of the inner edges 18a, 19a.
Hereinafter, the upper panel portion 18 and the lower panel portion 19 are provided on the long-side main wall portion 15 unless otherwise specified.

Each inner edge 18a, 19a of the upper panel portion 18 and the lower panel portion 19 extends straight in the circumferential direction. Side edges 18b and 19b of the upper panel portion 18 and the lower panel portion 19 extend straight in the bottle axis O direction. The outer peripheral edge of the upper panel portion 18 and the outer peripheral edge of the lower panel portion 19 have a rectangular shape when viewed from the front in the radial direction.
In addition, the inner edges 18a, 19a and the side edges 18b, 19b of the upper panel portion 18 and the lower panel portion 19 may extend curvedly when viewed from the front, or may have a plurality of curved lines. It may extend while being connected and bent, or a plurality of straight lines may be connected to present, for example, a trapezoidal shape.

The upper panel portion 18 includes a plurality of laterally elongated portions 18c spaced apart in the vertical direction, and a connection portion 18d connecting the laterally elongated portions 18c in the vertical direction. Circumferential center portions of the laterally elongated portion 18c and the connecting portion 18d are aligned with each other. The circumferential size of the laterally elongated portion 18c is larger than the circumferential size of the connecting portion 18d.

An inner edge 19 a of the lower panel portion 19 is located at the upper end of the lower panel portion 19 . The outer peripheral edge of the lower panel portion 19 is provided with an outer edge 19d positioned at the lower end and extending in the circumferential direction. An outer edge 19d of the lower panel portion 19 has a curved shape that protrudes downward in the front view. The side edge 19b of the lower panel portion 19 connects the circumferential ends of the inner edge 19a and the outer edge 19d in the bottle axis O direction.

A lateral groove 19 e extending straight in the circumferential direction is formed in the upper end portion of the bottom surface of the lower panel portion 19 . The lateral groove 19e is formed over the entire circumferential length of the upper end portion of the bottom surface of the lower panel portion 19 .
The outer edge 19d of the lower panel portion 19 may, for example, extend straight in the circumferential direction when viewed from the front, may extend while being bent by connecting a plurality of curved lines, or may extend by connecting a plurality of straight lines. May be stretched.

In the present embodiment, the main wall portion 15 on the long side has an inner edge 19a of the lower panel portion 19 and at least an upper end portion (a portion connected to the inner edge 19a) of the side edges 19b. An integrally enclosing arcuate groove 20 is formed.
The arch-shaped grooves 20 are separately formed in a pair of long-side main wall portions 15 that are opposed to each other in the radial direction.

The arch-shaped grooves 20 may be formed separately in a pair of short side main wall portions 16 that are opposed to each other in the radial direction. In other words, the arch-shaped grooves 20 may be separately formed in a pair of main wall portions 15 and 16 that are opposed to each other at least in the radial direction among the main wall portions 15 and 16 . Also, the arch-shaped groove 20 may be formed only in one of the plurality of main wall portions 15 and 16 .

The arch-shaped grooves 20 are located at both ends in the circumferential direction and extend in the direction of the bottle axis O, and have a pair of straight portions 22 surrounding the pair of side edges 19b of the lower panel portion 19 from the outside in the circumferential direction, and a pair of straight portions. 22 are connected in the circumferential direction, and a curved portion 23 surrounds the inner edge 19a of the lower panel portion 19 in the bottle axis O direction. The curved portion 23 presents a curvilinear shape that protrudes upward in the front view. The curved portion 23 has a single arc shape in the front view.
In addition, the curved portion 23 may extend in the circumferential direction while being bent by connecting a plurality of curved lines in the front view.

Circumferential center portions of the curved portion 23 and the lower panel portion 19 coincide with each other. The circumferential size of the curved portion 23 is larger than the circumferential size of the lower panel portion 19 . Curved portion 23 is located between lower panel portion 19 and circumferential groove 21 . Both ends of the curved portion 23 in the circumferential direction protrude outward in the circumferential direction from a first corner portion 19 c that connects the inner edge 19 a and the side edge 19 b of the lower panel portion 19 .

The linear portions 22 are provided at both ends of the main wall portion 15 on the long side in the circumferential direction. The straight portion 22 extends straight in the bottle axis O direction. The upper edge of the straight portion 22 is positioned below the upper edge of the side edge 19 b of the lower panel portion 19 .
The upper edge of the straight portion 22 may be positioned at the same position in the bottle axis O direction as the upper edge of the side edge 19b of the lower panel portion 19, or may be positioned above.

A circumferential interval between the straight portion 22 and the outer peripheral edge of the lower panel portion 19 is the same over the entire length in the bottle axis O direction. The space between the curved portion 23 and the outer peripheral edge of the lower panel portion 19 in the direction of the bottle axis O becomes narrower from the central portion in the circumferential direction toward the outer side in the circumferential direction. The circumferential interval between the linear portion 22 and the outer peripheral edge of the lower panel portion 19 is wider than the interval in the bottle axis O direction between the curved portion 23 and the outer peripheral edge of the lower panel portion 19. there is
Note that the circumferential distance between the linear portion 22 and the outer peripheral edge of the lower panel portion 19 is less than or equal to the distance in the direction of the bottle axis O between the curved portion 23 and the outer peripheral edge of the lower panel portion 19. good too.

The arch-shaped groove 20 surrounds more than half of the length of the side edge 19b of the lower panel portion 19 in the direction of the bottle axis O from the outside in the circumferential direction. In the illustrated example, the arch-shaped groove 20 surrounds the side edge 19b of the lower panel portion 19 over the entire length in the bottle axis O direction from the outside in the circumferential direction. The positions of the straight portion 22 of the arch-shaped groove 20 and the lower edges of the side edges 19b of the lower panel portion 19 in the direction of the bottle axis O are equal to each other.

A second corner portion 24 that connects the curved portion 23 and the straight portion 22 of the arch-shaped groove 20 when viewed from the outside in the radial direction has an arcuate shape that protrudes away from the lower panel portion 19 . When viewed from the outside in the radial direction, the radius of curvature of the inner peripheral edge of the second corner portion 24 of the arch-shaped groove 20 is the same as that of the first corner portion 19c connecting the inner edge 19a and the side edge 19b of the lower panel portion 19. larger than the radius of curvature. The top of the inner peripheral edge of the second corner portion 24 is located below the top of the first corner portion 19c. The top portion of the inner peripheral edge of the second corner portion 24 may be positioned at the same vertical position as the top portion of the first corner portion 19c, or may be positioned above the top portion of the first corner portion 19c.

As described above, according to the rectangular bottle 1 according to the present embodiment, since the arch-shaped grooves 20 are formed in the main wall portion 15 on the long side, the rigidity of the main wall portion 15 on the long side can be increased. Therefore, stress concentration on the first corner portion 19c connecting the inner edge 19a and the side edge 19b of the lower panel portion 19 can be suppressed when the pressure inside the rectangular bottle 1 is reduced.

Since both ends of the curved portion 23 of the arch-shaped groove 20 in the circumferential direction are located outside the first corner portion 19c of the lower panel portion 19 in the circumferential direction, the curved portion 23 and the straight portion 22 of the arch-shaped groove 20 are aligned. It is possible to provide the second corner portion 24 connecting the and at a position spaced apart from the first corner portion 19c. It is possible to suppress large local deformation in the vicinity of the one corner portion 19c.

As described above, when the pressure in the square bottle 1 is reduced, the main wall portion 15 on the long side can be prevented from being significantly deformed locally due to stress concentration on the first corner portion 19c. It becomes possible and the reduced pressure absorption capacity can be increased.
Since the arch-shaped grooves 20 increase the rigidity of the main wall portion 15 on the long side, when the interior of the rectangular bottle 1 is depressurized, the bottom panel portion 19 is folded from the first corner portion 19c to the outer side in the circumferential direction and obliquely upward. can be suppressed.

Although the inner edge 19a of the lower panel portion 19 extends straight in the circumferential direction and stress tends to concentrate on the first corner portion 19c of the lower panel portion 19, as described above, the long side Since it is possible to suppress the occurrence of portions that are locally greatly deformed in the main wall portion 15, the reduced pressure absorption capacity can be effectively increased.

Since the arch-shaped groove 20 surrounds more than half of the length of the side edge 19b of the lower panel portion 19 in the direction of the bottle axis O from the outer side in the circumferential direction, the arch-shaped groove 20 Almost the entire area including the lower panel portion 19 surrounded by the arch-shaped groove 20 can be deformed radially inward when the interior of the rectangular bottle 1 is decompressed. The reduced pressure absorption capacity of the rectangular bottle 1 can be reliably increased.

When viewed from the outside in the radial direction, the radius of curvature of the inner peripheral edge of the second corner portion 24 of the arch-shaped groove 20 is larger than the radius of curvature of the first corner portion 19c of the lower panel portion 19. It is possible to reliably suppress the arch-shaped groove 20 from breaking when the pressure is reduced, and stress is applied to the portion of the main wall portion 15 on the long side located inside the second corner portion 24 of the arch-shaped groove 20. can be suppressed from concentrating on As a result, when the interior of the rectangular bottle 1 is decompressed, the portion of the long-side main wall portion 15 located inside the arch-shaped groove 20 can be easily deformed inward in the radial direction. The reduced pressure absorption capacity of the rectangular bottle 1 can be reliably increased.

The present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the invention.

For example, in the above embodiment, the arch-shaped groove 20 surrounds more than half of the length of the side edge 19b of the lower panel portion 19 in the direction of the bottle axis O from the outside in the circumferential direction. A configuration in which only the upper end portion of 19b is surrounded from the outside in the circumferential direction may be employed.
The arcuate groove 20 may integrally surround the inner edge 18a of the upper panel portion 18 and at least the connecting portion of the side edge 18b with the inner edge 18a.
The radius of curvature of the inner peripheral edge of the second corner portion 24 of the arch-shaped groove 20 may be less than or equal to the radius of curvature of the first corner portion 19 c of the lower panel portion 19 when viewed from the outside in the radial direction.
The arch-shaped groove 20 may be provided so as to surround the upper portion of the upper panel portion 18 or may be provided so as to surround the lower portion of the lower panel portion 19 .

In the above-described embodiment, the cross-sectional shape of each of the shoulder portion 12, the body portion 13 and the bottom portion 14 perpendicular to the bottle axis O is rectangular. Alternatively, it may be changed as appropriate, such as a pentagonal shape.

Further, the synthetic resin material forming the rectangular bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof.
Furthermore, the rectangular bottle 1 may be a laminated structure having an intermediate layer instead of being limited to a single layer structure. Examples of the intermediate layer include a layer made of a resin material having gas barrier properties, a layer made of a recycled material, a layer made of a resin material having oxygen absorption properties, and the like.

In addition, it is possible to appropriately replace the components in the above-described embodiment with well-known components without departing from the gist of the present invention, and the above-described modifications may be combined as appropriate.

1 Rectangular bottle 11 Mouth 12 Shoulder 13 Body 14 Bottom 15 Main wall on long side 16 Main wall on short side 17 Connecting part 18 Upper panel 18a Inner edge of upper panel 18b Side edge of upper panel Rim 19 Lower panel portion 19a Inner edge of lower panel portion 19b Side edge of lower panel portion 19c First corner portion of lower panel portion 20 Arch-shaped groove 22 Straight portion 23 Curved portion 24 Second corner portion O Bottle shaft

Claims (4)

The mouth portion, shoulder portion, body portion, and bottom portion are continuously arranged in this order from top to bottom along the axial direction of the bottle,
The barrel includes a plurality of main walls connected via connecting portions in a circumferential direction along the axis of the bottle so that a cross-sectional view perpendicular to the axis of the bottle has a rectangular shape,
An upper panel portion and a lower panel portion recessed radially inward are formed on the main wall portion at intervals in the axial direction of the bottle,
The outer peripheral edge of the upper panel portion and the outer peripheral edge of the lower panel portion are opposed to each other in the axial direction of the bottle and extend in the circumferential direction. a pair of separately extending side edges;
The main wall portion integrally includes the inner edge of at least one of the upper panel portion and the lower panel portion and a portion of the side edge that connects at least the inner edge. A surrounding arched groove is formed,
The arch-shaped grooves are located at both ends in the circumferential direction and extend in the axial direction of the bottle, and have a pair of linear portions surrounding the pair of side edges from the outside in the circumferential direction, and connect the pair of linear portions in the circumferential direction. and a curved portion surrounding the inner edge in the axial direction of the bottle,
Both ends of the curved portion in the circumferential direction are positioned outside in the circumferential direction of a first corner portion connecting the inner edge and the side edge ,
The circumferential size of the curved portion is larger than the circumferential size of the panel portion surrounded by the arch-shaped groove in the axial direction of the bottle, out of the upper panel portion and the lower panel portion. Bottle. 2. The rectangular bottle according to claim 1, wherein said inner edge extends straight in the circumferential direction. 3. The rectangular bottle according to claim 1, wherein said arch-shaped groove surrounds more than half of the length of said side edge in the axial direction of the bottle from the outside in the circumferential direction. When viewed from the outside in the radial direction, the curvature radius of the inner peripheral edge of the second corner portion connecting the curved portion and the straight portion is the curvature radius of the first corner portion connecting the inner edge and the side edge. 4. Rectangular bottle according to any one of claims 1 to 3, which is larger than the radius.

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