JP5793300B2 - Bottle - Google Patents

Description

  The present invention relates to a bottle.

Conventionally, as a bottle formed in a bottomed cylindrical shape with a synthetic resin material, for example, as shown in Patent Document 1 below, a mouth, a shoulder, a trunk, and a bottom are integrally formed, A configuration is known in which a plurality of panel portions recessed toward the inside in the radial direction are formed at intervals in the circumferential direction.
According to this configuration, for example, when the temperature of the contents sealed in the bottle is reduced and the inside of the bottle is decompressed, the panel portion is preferentially deformed toward the inside in the radial direction, thereby reducing the pressure inside the bottle. To absorb.

JP 2010-76821 A

  By the way, in the conventional bottle mentioned above, there was room for improvement in improving the decompression absorption performance in a bottle.

  Then, this invention was made | formed in view of the situation mentioned above, Comprising: The objective is to provide the bottle which can improve the pressure reduction absorption performance of a bottle.

In order to solve the above problems, the present invention proposes the following means.
The bottle according to the present invention is a bottle in which a plurality of panel portions that are recessed toward the inside in the radial direction are formed in the cylindrical body portion at intervals in the circumferential direction. A bottom wall portion located on the inner side of the bottom wall portion, and a side wall portion extending radially outward from an outer peripheral edge of the bottom wall portion, the bottom wall portion being directed from the outer side toward the inner side in the circumferential direction, A pair of first inclined surfaces extending from the inner side to the outer side in the radial direction, and a ridge line portion connecting the inner ends in the circumferential direction of the first inclined surface, the bottom wall portion, and the side wall In the connecting portion between the bottom wall portion and the longitudinal side wall portion located on both sides in the circumferential direction, a concave groove that is recessed toward the inside in the radial direction and that extends only in the axial direction is formed. It is characterized by being.

With this feature, when the inside of the bottle is depressurized, the bottom wall is rotated inward in the radial direction around the concave groove formed in the connecting portion between the bottom wall and the vertical side wall in the panel. The bottom wall can be flexibly deformed while following the change in the internal pressure in the bottle with high sensitivity. Moreover, since the length in the circumferential direction of the bottom wall portion is increased by forming the concave groove, the amount of deformation of the bottom wall portion inward in the radial direction can be increased. Thereby, the reduced pressure absorption performance can be improved.
Moreover, when the bottom wall portion is displaced toward the inner side in the radial direction during decompression, the vertical side wall portion is positioned between the adjacent panel portions in the circumferential direction with the outer end portion in the radial direction being the center along with the displacement. Displaces toward the inside of the column. That is, it will be displaced so that the vertical side wall parts located in the both sides of the circumferential direction in a pillar part may approach. Thereby, the rising angle from the bottom wall part of a vertical side wall part becomes steep, and the rigidity with respect to the radial direction of a pillar part can be improved. As a result, when the bottle is depressurized or when an external force is applied, it is possible to suppress the occurrence of folding or buckling of the column portion toward the inside in the radial direction.

In addition , by forming the bottom wall portion so as to gradually extend from the inner side to the outer side in the radial direction as it goes from the outer side to the inner side in the circumferential direction, it is directed toward the inner side in the radial direction of the bottom wall portion during absorption of reduced pressure. Therefore, it is possible to further improve the vacuum absorption performance.

  According to the bottle of the present invention, the reduced pressure absorption performance of the bottle can be improved.

It is a side view of the bottle in the embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is an expanded sectional view in the B section of FIG. It is an expanded sectional view in the C section of FIG.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
1 and 2, the bottle 1 according to the present embodiment includes a mouth portion 11, a shoulder portion 12, a trunk portion 13, and a bottom portion 14, and these 11 to 14 have their respective central axes as a common axis. It is a schematic configuration that is arranged in this order in a state of being positioned above.

Hereinafter, the above-described common axis is referred to as the bottle axis O, the mouth 11 side along the bottle axis O direction is referred to as the upper side, the bottom 14 side is referred to as the lower side, and the direction orthogonal to the bottle axis O is referred to as the radial direction. The direction around the bottle axis O is called the circumferential direction.
The bottle 1 is formed by blow-molding a preform formed into a bottomed cylinder by injection molding, and is integrally formed of a synthetic resin material. Further, a cap (not shown) is attached to the mouth portion 11. Further, each of the mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 has a circular shape in a cross-sectional view orthogonal to the bottle axis O.

In the connection portion between the shoulder portion 12 and the body portion 13 and the connection portion between the body portion 13 and the bottom portion 14, a concave groove 16 that is recessed toward the inside in the radial direction is formed continuously over the entire circumference. ing.
The body portion 13 is formed in a cylindrical shape, and its outer peripheral surface has a curved shape that gradually decreases in diameter from the outer side (upper and lower end portions) to the inner side (center portion) in the bottle axis O direction. That is, the body portion 13 is formed with a smaller diameter on the inner side in the bottle axis O direction than the outer side, and the overall appearance is formed in a constricted shape.

  Here, the body portion 13 is formed with a plurality of vacuum absorbing panel portions 17 that are recessed inward in the radial direction at intervals in the circumferential direction. And in the trunk | drum 13, the part located between the panel parts 17 adjacent in the circumferential direction comprises the pillar part 19 extended along the bottle axis | shaft O direction. That is, in the body portion 13, the concave panel portions 17 and the convex column portions 19 are alternately arranged in the circumferential direction.

The panel part 17 is erected so as to surround the bottom wall part 21 formed in a rectangular shape with the bottle axis O direction as a longitudinal direction when viewed from the outside in the radial direction, and the bottom wall part 21 over the entire circumference. And a side wall portion 22.
As shown in FIGS. 1-3, a pair of vertical side wall part 22a which is located in the both sides of the circumferential direction in the bottom wall part 21 among the side wall parts 22, and extends in a bottle axis | shaft O direction goes to an outer side from the inner side of radial direction. Accordingly, the inclined surface is inclined toward the outer side in the circumferential direction (the direction in which the vertical side wall portions 22a are separated). The column part 19 positioned between the panel parts 17 adjacent to each other in the circumferential direction is such that the cross-sectional view perpendicular to the bottle axis O decreases in the circumferential direction from the inner side to the outer side in the radial direction. It is formed into a shape.
On the other hand, a pair of side wall parts 22b (refer FIG. 1) which are located in the both sides of the bottle axis | shaft O direction among the side wall parts 22 and extend in the circumferential direction are the direction of a bottle axis | shaft O direction as it goes to an outer side from radial inner side. The inclined surface is inclined from the inner side toward the outer side (the direction in which the lateral side wall portions 22b are separated).

The bottom wall portion 21 is located on the radially inner side of the panel portion 17 and is formed in a mountain shape that gradually extends from the inner side to the outer side in the radial direction from the outer peripheral edge toward the central portion in the circumferential direction. Has been. Specifically, the bottom wall portion 21 includes a pair of first inclined surfaces 21a extending gradually from the inner side to the outer side in the radial direction as the cross-sectional shape orthogonal to the bottle axis O moves from the outer side to the inner side in the circumferential direction. Have. The plan view shape of the first inclined surface 21a viewed from the outside in the radial direction is formed in a trapezoidal shape that decreases in size in the bottle axis O direction from the outside in the circumferential direction to the inside (see FIG. 1). .
And the ridgeline part 21b which connects each 1st inclined surface 21a is formed in the inner edge part of the circumferential direction in each 1st inclined surface 21a. The ridge line portion 21b is located at the center portion in the circumferential direction of the bottom wall portion 21 and is a flat surface extending along the bottle axis O direction, and the top surface of the bottom wall portion 21 located on the outermost side in the radial direction. It is composed.

  Further, the bottom wall portion 21 has a pair of second inclined surfaces 21c (see FIG. 5) extending gradually from the inner side to the outer side in the radial direction as the shape of the longitudinal sectional view along the bottle axis O moves from the outer side to the inner side in the bottle axis O direction. 1). The planar shape of the second inclined surface 21c when viewed from the outside in the radial direction is formed into a pentagonal shape in which at least the inner side in the bottle axis O direction becomes smaller in the circumferential direction as it goes from the outer side to the inner side in the bottle axis O direction. Has been. The inner end portion of the second inclined surface 21c in the bottle axis O direction is connected to the outer end portion of the first inclined surface 21a in the bottle axis O direction and the outer end portion of the ridge line portion 21b in the bottle axis O direction. Has been.

And in this embodiment, the connection part of the bottom wall part 21 and the vertical side wall part 22a, the outer side edge part of the circumferential direction in the 1st inclined surface 21a of the bottom wall part 21, and the 2nd inclined surface 21c, A pair of concave grooves 31 extending along the bottle axis O direction is formed at a connection portion between the longitudinal side wall portion 22a and the radially inner end portion. These concave grooves 31 are recessed toward the inside in the radial direction, and the cross-sectional shape orthogonal to the bottle axis O direction is formed in a semicircular shape. The concave groove 31 is rotatable about the concave groove 31 so as to move the bottom wall portion 21 inward in the radial direction. In the present embodiment, the connection portion between the bottom wall portion 21 and the vertical side wall portion 22a includes a ridge line portion between the bottom wall portion 21 and the vertical side wall portion 22a and the vicinity thereof.
Moreover, trapezoidal shape, U shape, etc. can be employ | adopted for the said cross-sectional shape of the ditch | groove 31, and the shape is not limited.

  In this case, as shown in FIG. 3, the concave groove 31 is located on the inner side in the radial direction with respect to the virtual line L extended outward in the circumferential direction following the surface shape of the bottom wall portion 21 (first inclined surface 21 a). And is continuously formed over the entire region in the bottle axis O direction. In addition, when the 1st inclined surface 21a is comprised by the some curve, a straight line, or those combination, the line extended according to the surface shape of the part adjacent to the ditch | groove 31 is made into the virtual line L. .

  In addition, the surface located in the radial direction outer side in the column part 19 has comprised the curved shape which diameter-reduces gradually toward the inner side of radial direction from the outer side to the inner side in the bottle axis | shaft O direction. Thus, the handleability at the time of grasping the bottle 1 can be improved by forming the body portion 13 (the column portion 19) into a constricted shape with a diameter reduced from the outside toward the inside in the bottle axis O direction.

As shown in FIGS. 3 and 4, when the inside of the bottle 1 is depressurized, the bottom wall portion 21 is in the radial direction around the connection portion between the bottom wall portion 21 and the side wall portion 22 in the panel portion 17. It will be displaced toward the inside. That is, when the bottom wall portion 21 of the panel portion 17 is preferentially deformed at the time of depressurization, the internal pressure change (depressurization) of the bottle 1 is not accompanied by deformation at other portions (for example, the column portion 19 and the shoulder portion 12). ) Can be absorbed.
In particular, by forming the concave groove 31 in the connection portion between the bottom wall portion 21 and the vertical side wall portion 22a, the bottom wall portion 21 rotates toward the inside in the radial direction around the concave groove 31 during decompression. Will be displaced as follows. Therefore, flexibility can be provided on the outer side in the circumferential direction of the bottom wall portion 21 to exhibit a high hinge effect, and the bottom wall portion 21 can be flexibly deformed while following the internal pressure change in the bottle 1 with high sensitivity. As a result, the amount of deformation in the radial direction of the bottom wall 21 at the time of absorbing the reduced pressure can be secured.

As described above, according to the present embodiment, the concave groove 31 is formed in the connection portion between the bottom wall portion 21 and the side wall portion 22, so that the bottom wall portion 21 has a diameter centered on the concave groove 31 when absorbing the reduced pressure. It can be easily displaced inward in the direction. Moreover, since the length in the circumferential direction of the bottom wall portion 21 is increased by forming the concave groove 31, the amount of deformation of the bottom wall portion 21 inward in the radial direction can be increased. Thereby, the deformation | transformation amount to the inner side of the radial direction of the bottom wall part 21 at the time of vacuum absorption can be ensured, and vacuum absorption performance can be improved.
Further, by forming the bottom wall portion 21 in a mountain shape extending from the inside in the radial direction toward the outside, it is possible to secure the amount of deformation of the bottom wall portion 21 in the radial direction at the time of absorbing the reduced pressure. Therefore, further improvement in reduced pressure absorption performance can be achieved.

  Moreover, when the bottom wall portion 21 is displaced toward the inner side in the radial direction during decompression, the vertical side wall portion 22a is displaced toward the inner side of the column portion 19 with the outer end portion in the radial direction being the center along with this displacement ( (See solid line in FIG. 4). That is, the vertical side wall portions 22a located on both sides of the column portion 19 in the circumferential direction are displaced so as to approach each other. Thereby, the rising angle from the bottom wall part 21 of the vertical side wall part 22a becomes steep, and the rigidity with respect to the radial direction of the column part 19 can be improved. As a result, when the bottle 1 is depressurized or when an external force is applied, it is possible to suppress the occurrence of folding or buckling of the column portion 19 toward the inside in the radial direction.

  Here, the inventor of the present application analyzed the relationship between the reduced pressure strength (kPa) and the absorption capacity (ml) for each of the bottles of the present embodiment described above (hereinafter referred to as test bottles) and the comparative bottles. In addition, as a comparison bottle, the thing which does not form the concave groove 31 in the connection part of the bottom wall part 21 and the vertical side wall part 22a was used. Moreover, the thing for 500 ml was employ | adopted as a test bottle and a comparison bottle used for this analysis.

  First, for both bottles, it was confirmed that when the inside of the bottle was depressurized, the reduced pressure absorption capacity gradually increased as the depressurization strength increased. This is considered because the bottom wall part 21 of the panel part 17 was displaced toward the inner side in the radial direction due to the decompression in the bottle as described above.

Thereafter, when the reduced pressure strength is further increased, in the comparative bottle, the increase in the reduced pressure strength cannot be followed, and local deformation may occur in places other than the panel portion 17 during the reduced pressure. The absorption capacity when local deformation occurred in the comparative bottle, that is, the maximum absorption capacity by the panel portion 17 of the comparative bottle was 34.3 (ml).
On the other hand, the test bottle was able to withstand the maximum absorption capacity up to 37.1 (ml) against the increase in vacuum strength. As described above, the test bottle has the concave groove 31 formed in the connecting portion between the bottom wall portion 21 and the vertical side wall portion 22a, so that the bottom wall portion 21 is arranged in the radial direction around the concave groove 31. This is thought to be because it was easier to displace inside. Moreover, since the length in the circumferential direction of the bottom wall portion 21 is longer than that of the comparative bottle by forming the concave groove 31, it is considered that the deformation amount of the bottom wall portion 21 in the radial direction is increased as a factor. It is done.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

For example, the design of the curvature radius of the body portion 13 can be changed as appropriate.
Further, the number and arrangement of the panel portions 17 and the column portions 19 can be appropriately changed in consideration of the strength required for the bottle 1 and the reduced pressure absorption capacity.
Further, in the above-described embodiment, the cross-sectional view orthogonal to the bottle axis O of each of the shoulder portion 12, the body portion 13 and the bottom portion 14 is circular, but is not limited thereto, and for example, a polygonal shape is appropriately used. It may be changed.

Moreover, although embodiment mentioned above demonstrated the case where the ditch | groove 31 was continuously formed over the bottle axis | shaft O direction whole region in the bottom wall part 21, the ditch | groove 31 was intermittently along the bottle axis | shaft O direction. The perforated processing may be provided, and in this case, the distance between the concave grooves 31 may be shortened to form a substantially continuous linear shape.
Further, in the above-described embodiment, the case where the concave grooves 31 are provided one by one in the connection portion between the bottom wall portion 21 and the vertical side wall portion 22a is not limited to this, and a plurality of grooves may be provided. .

Moreover, you may provide a ditch | groove also in the connection part of the bottom wall part 21 and the side wall part 22b.
Furthermore, in the above-described embodiment, the bottom wall portion 21 is formed in a mountain shape having the ridge line portion 21b. However, the shape is not limited to this, and the bottom wall portion 21 is curved toward the flat surface or the radial direction from the outer side to the inner side in the circumferential direction. It may be formed on a curved surface or the like.

The synthetic resin material forming the bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof.
Further, the bottle 1 is not limited to a single layer structure, and may be a laminated structure having an intermediate layer. Examples of the intermediate layer include a layer made of a resin material having a gas barrier property, a layer made of a recycled material, or a layer made of a resin material having an oxygen absorbing property.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Bottle 13 ... Body part 17 ... Panel part 21 ... Bottom wall part 22 ... Side wall part 22a ... Vertical side wall part 31 ... Concave groove L ... Virtual line

Claims (1)

In the cylindrical body part, a plurality of panel parts recessed toward the inside in the radial direction are formed at intervals in the circumferential direction,
The panel part is a bottom wall part located inside in the radial direction;
A side wall extending from the outer peripheral edge of the bottom wall toward the outside in the radial direction,
The bottom wall is
A pair of first inclined surfaces extending from the inner side to the outer side in the radial direction as they go from the outer side to the inner side in the circumferential direction;
A ridge line part connecting the inner ends of the first inclined surface in the circumferential direction, and
The connecting portion between the bottom wall portion and the vertical side wall portion located on both sides in the circumferential direction of the bottom wall portion is recessed radially inward and along only the axial direction. A bottle characterized in that a concave groove extending is formed.

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