JP6473284B2 - Bottle - Google Patents

Description

  The present invention relates to a bottle.

Conventionally, as a bottle formed into a bottomed cylindrical shape with a synthetic resin material, for example, as shown in Patent Document 1 below, the cylindrical body portion is recessed toward the inner side in the radial direction, and on the entire circumference. A configuration is known in which a plurality of circumferential grooves extending continuously are formed at intervals in the bottle axial direction.
According to this configuration, since the rigidity in the radial direction of the bottle can be increased, for example, when the line pressure acts on the body portion, or when the temperature of the contents sealed in the bottle is lowered and the inside of the bottle is decompressed For example, the deformation of the body portion is suppressed.

JP 2004-262500 A

  However, the above-described conventional bottle has room for improvement with respect to improving the vacuum absorption performance in the bottle.

  Then, this invention was made | formed in view of the situation mentioned above, Comprising: The objective is to provide the bottle which can be provided with desired decompression absorption performance.

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 circumferential grooves that are recessed toward the inside in the radial direction and extend over the entire circumference are formed at intervals in the bottle axis direction in a cylindrical body portion. The circumferential grooves are each formed in the same shape and size, and have a wave shape extending periodically along the circumferential direction while being bent in the bottle axial direction in a side view of the body portion, Out of the circumferential grooves adjacent in the direction, the circumferential positions of the tops on the mountain side in one circumferential groove and the tops on the mountain side and valley side in the other circumferential grooves adjacent to the one circumferential groove, and The circumferential positions of the top of the valley side in the one circumferential groove and the top of the mountain side and the valley side in the other circumferential groove are different from each other. The tops of the mountain side and the valley side are curved, and connect the tops of the mountain side and the valley side. The connecting part is a straight line, and in the connecting part, in the side view of the body part, the inclination angle with respect to the circumferential direction of the connecting part located on the front surface overlapping the bottle axis is 15 ° or more, and the bottle The minimum distance between the circumferential grooves adjacent in the axial direction is characterized by being not less than the amplitude in the bottle axial direction between the crests on the crest and trough sides in the circumferential groove.

Due to such a feature, the circumferential groove has a wave shape extending while bending in the bottle axial direction, so that when the bottle is decompressed, the portion located between the circumferential grooves on the body portion is directed radially inward. It is possible to suppress the acting stress from spreading in the circumferential direction by the circumferential groove (connecting portion). For this reason, it is possible to absorb the change in the internal pressure (decompression) of the bottle while suppressing the unauthorized deformation of the body and uniformly deforming the body over the entire circumferential direction. As a result, desired vacuum absorption performance can be provided.
Moreover, since the circumferential groove has a wave shape, the design can be improved as compared with the straight shape in which the circumferential groove is formed along the circumferential direction as in the prior art.
Further, when an axial force in the compression direction is applied to the bottle, it is possible to suppress the body portion from being compressed and deformed so as to narrow the groove width of the circumferential groove over the entire circumference, and buckling due to the formation of the circumferential groove. A decrease in strength can be suppressed.

The inclination angle may be 20 ° or more and 55 ° or less.
In this case, by making the inclination angle 20 ° or more, the above-described effects can be reliably achieved.
On the other hand, by setting the inclination angle to 55 ° or less, when the bottle is depressurized, the stress acting on the inner side in the radial direction on the portion located between the circumferential grooves in the body portion is transmitted to the bottle shaft through the connecting portion. Spreading in the direction can be suppressed, and unauthorized deformation of the trunk can be suppressed.

Moreover, the said trunk | drum may be gradually diameter-reduced as it goes inside from the outer side of a bottle axial direction.
In this case, even a drawn bottle having a reduced pressure strength compared to a so-called straight bottle in which the body portion has the same diameter in the whole bottle axial direction can have a desired reduced pressure absorption performance.

  The bottle according to the present invention can have a desired reduced-pressure absorption performance.

It is a side view of the bottle in the embodiment of the present invention. It is an enlarged side view which shows the circumferential groove of a bottle. It is a side view of the bottle which shows the other structure of embodiment. It is a graph which shows the relationship between an inclination angle and pressure reduction intensity. It is a side view of the bottle which shows the other structure of embodiment. It is a side view of the bottle which shows the other structure of embodiment. It is a side view of the bottle which shows the other structure of embodiment. It is a side view of the conventional bottle.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, 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 bottles are positioned with their central axes on a common axis. It is set as the schematic structure connected in order.

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 integrally formed of a synthetic resin material, and is formed by blow molding a preform formed into a bottomed cylinder by injection molding. Further, a cap (not shown) is attached to the mouth portion 11. Further, each of the mouth portion 11, the shoulder portion 12, the trunk portion 13, and the bottom portion 14 has a circular cross-sectional view shape along the radial direction.

  The trunk | drum 13 is formed in a cylinder shape, and the annular groove 16 is continuously formed in the both ends of the bottle axis | shaft O direction over the perimeter.

  In addition, a circumferential groove 15 that is recessed toward the inner side in the radial direction and continuously extends over the entire circumference is formed in the intermediate portion 13a located between both end portions in the bottle axis O direction of the body portion 13. A plurality are formed at intervals in the bottle axis O direction (four in the illustrated example). These circumferential grooves 15 are evenly arranged in the bottle axis O direction over the entire area in the bottle axis O direction in the intermediate portion 13a.

  Each circumferential groove 15 has a wave shape of the same shape and the same size as each other extending in the circumferential direction while being bent in the bottle axis O direction in a side view of the body portion 13. Specifically, each circumferential groove 15 has a peak-side peak 15a (hereinafter referred to as a peak-side peak 15a) projecting upward and a valley-shaped peak 15b (hereinafter referred to as a valley-side peak 15b) protruding downward. While alternately located along the circumferential direction, the mountain-side top 15a and the valley-side top 15b are connected by a connecting portion 15c. In the example shown in the figure, the mountain-side top portion 15a and the valley-side top portion 15b are curved, and the connecting portion 15c that connects the top portions 15a and 15b is a straight line.

Moreover, the phase of each circumferential groove 15 adjacent in the bottle axis O direction is the same phase. That is, between the circumferential grooves 15 adjacent in the bottle axis O direction, the above-described mountain-side crests 15a and valley-side crests 15b have the same positions along the circumferential direction (positions that overlap in the bottle axis O direction). The distance in the bottle axis O direction is the same over the entire circumference.
In addition, as shown in FIG. 2, in the side view of the body portion 13, the inclination angle θ with respect to the circumferential direction of the connecting portion 15 c in the circumferential groove 15, specifically, the circumferential direction along the bottle axis O direction in the circumferential direction. The angle formed by the first imaginary line L1 passing through the central part of the groove 15 and the second imaginary line L2 passing through the central part of the groove width in the connecting part 15c may be in the range of 15 ° to 60 °. preferable. This will be described in detail later. In FIG. 2, the scale is different from that of the circumferential groove 15 shown in FIG. 1 for easy understanding of the drawing.

According to the present embodiment, since the circumferential groove 15 has a wave shape extending while being bent in the bottle axis O direction, the diameter of the portion located between the circumferential grooves 15 in the body portion 13 when the bottle 1 is decompressed. It is possible to suppress the stress acting toward the inner side in the direction from spreading in the circumferential direction by the circumferential groove 15 (connecting portion 15c). Therefore, unauthorized deformation of the body portion 13 is suppressed, and changes in the internal pressure (decompression) of the bottle 1 can be absorbed while the body portion 13 is uniformly deformed over the entire circumferential direction. As a result, desired vacuum absorption performance can be provided.
Further, since the circumferential groove 15 has a wave shape, the design can be improved as compared with the straight shape in which the circumferential groove 15 is formed along the circumferential direction as shown in FIG.

  Here, in order to confirm the above-described effects, the inventor of the present application verified the relationship between the inclination angle θ of the circumferential groove 15 (connecting portion 15c) and the reduced pressure strength (kPa). In this verification, the bottom portion 14 is not substantially deformed at the time of decompression, and the decompression strength of only the body portion 13 is verified by analysis. In this verification, when the sample bottle was decompressed in a sealed state, the pressure at the time of unauthorized deformation was read as the decompression strength.

  Next, sample bottles (Examples 1 to 4 and Comparative Examples 1 and 2) used in this verification will be described. In each example, the depth D in the radial direction in the circumferential groove 15 and the amplitude A (the central portion of the groove width in the mountain side top portion 15a along the bottle axis O direction, and the central portion of the groove width in the valley side top portion 15b, The length of the circumferential groove 15 adjacent to each other in the direction of the bottle axis O (see FIG. 2). In each figure shown below, the same reference numerals are given to the components corresponding to those in FIG. 1 described above, and description thereof is omitted.

Examples 1, 2, and 4 are the bottle 1 shown in FIG. 1 described above, and the circumferential groove 15 has a wave shape, and the phase of the circumferential groove 15 adjacent in the bottle axis O direction is the same phase. Is.
Example 3 is the bottle 1 shown in FIG. 3, in which the circumferential groove 15 has a wave shape and the phase of the circumferential groove 15 adjacent in the bottle axis O direction is reversed. That is, between the circumferential grooves 15 adjacent in the bottle axis O direction, the positions along the circumferential direction of the peak side peak portion 15a and the valley side peak portion 15b are equal.
Moreover, the comparative examples 1 and 2 are the bottles shown in FIG. 8, Comprising: The thing of the straight shape which formed the circumferential groove 15 along the circumferential direction.

Specific conditions of the above-described examples and comparative examples are as follows.
Example 1: Depth D = 1.5 mm of circumferential groove 15 and amplitude A = 4 mm, same phase Example 2: Depth D of circumferential groove 15 = 1.5 mm, amplitude A = 6 mm, same phase Example 3: Circumferential groove 15 depth D = 1.5 mm, amplitude A = 4 mm, reverse phase Example 4: Circumferential groove 15 depth D = 2.0 mm, amplitude A = 4 mm, same phase Comparative Example 1: Circumferential groove 15 Depth D = 1.5mm
Comparative example 2: Depth D of circumferential groove 15 = 2.0 mm

As shown in FIG. 4, it can be seen that the relationship between the inclination angle and the reduced pressure intensity has the same tendency regardless of changes in the amplitude A, the phase, and the depth D. Specifically, in each embodiment, the pressure reduction intensity increases as the inclination angle θ increases up to a predetermined angle.
As described above, since the circumferential groove 15 has a wave shape in the embodiment as described above, the stress acting on the body portion 13 when the bottle 1 is decompressed is prevented from spreading in the circumferential direction by the connecting portion 15c. This is considered to have been able to be uniformly deformed over the entire circumferential direction. In each of the examples, it was confirmed that the reduced pressure strength was more than that of each comparative example in the angle range of 15 ° or more, and the maximum in the angle range of 35 ° to 45 °.

On the other hand, it can be seen that, in each example, when the inclination angle θ becomes too large, the reduced pressure strength gradually decreases.
This is considered to be because when the inclination angle θ increases, the stress acting on the body portion 13 when the bottle 1 is depressurized easily spreads in the direction of the bottle axis O along the connecting portion 15c. In addition, at least for Examples 1, 3, and 4, it was confirmed that the reduced-pressure strength was equal to or greater than that of Comparative Example 2 until the inclination angle was 60 ° or less.

From the above results, the inclination angle θ is preferably 15 ° or more and 60 ° or less, and more preferably 20 ° or more and 55 ° or less in order to reliably improve the pressure reduction strength. That is, by setting the inclination angle θ to 20 ° or more, when the bottle 1 is depressurized, the stress acting on the inner side in the radial direction on the portion located between the circumferential grooves 15 in the body portion 13 is increased in the circumferential direction. Spreading can be reliably suppressed by the connecting portion 15c.
On the other hand, when the inclination angle θ is set to 55 ° or less, when the bottle 1 is decompressed, the stress acting on the inner side in the radial direction on the portion located between the circumferential grooves 15 in the body portion 13 is reduced to the connecting portion 15c. It is possible to reliably suppress spreading in the direction of the bottle axis O along the path. As a result, unauthorized deformation of the body portion 13 can be suppressed and desired vacuum absorption performance can be provided.

  In the comparative example, since the circumferential groove 15 is formed straight along the circumferential direction, the stress acting between the circumferential grooves 15 in the body 13 when the bottle 1 is decompressed easily spreads in the circumferential direction. In this case, when a portion of the body portion 13 along the circumferential direction is locally reduced in diameter toward the inside in the radial direction, the portions located on both sides in the circumferential direction are expanded toward the outside in the radial direction. On the other hand, the portions facing in the radial direction are deformed to the inner diameter in the radial direction. As a result, it is considered that the body portion 13 is likely to be easily deformed in an elliptical shape or the like in a sectional view along the radial direction.

  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, in the above-described embodiment, the case where the circumferential groove 15 is formed in a sine wave shape in which the peak side peak portion 15a and the valley side peak portion 15b are curved is not limited thereto, but as shown in FIG. The circumferential groove 15 may be formed in a triangular wave shape.

In the above-described embodiment, the case where the circumferential grooves 15 adjacent in the bottle axis O direction are in the same phase (see FIG. 1) or opposite phase (see FIG. 3) has been described. As shown, the phase may be shifted between the same phase and the opposite phase.
As shown in FIGS. 3 and 6, when the axial force in the compression direction is applied to the bottle 1 by shifting the phases of the circumferential grooves 15 adjacent to each other in the bottle axis O direction, It is possible to suppress compression deformation so that the groove width of the groove 15 is narrowed over the entire circumference, and it is possible to suppress a reduction in buckling strength due to the formation of the groove 15.
Furthermore, the number and depth of the circumferential grooves 15, the amplitude A, and the like can be appropriately changed in design.

In the embodiment described above, the cross-sectional view shape along the radial direction of each of the shoulder portion 12, the trunk portion 13, and the bottom portion 14 is a circular shape, but is not limited thereto. May be. Furthermore, in the above-described embodiment, the case where the outer diameter of the body portion 13 has the same diameter over the entire bottle axis O direction has been described. It doesn't matter.
For example, as shown in FIG. 7, a so-called squeezed bottle in which the body portion 13 is gradually reduced in diameter from the outside toward the inside in the bottle axis O direction may be employed.
In this case, even if the bottle 13 is a drawn bottle having a reduced pressure strength lower than that of a so-called straight bottle (see FIG. 1) having the same diameter over the entire bottle axis O direction, the desired reduced pressure absorption performance is obtained. Can be provided.

  Moreover, although the structure which connects the mountain side top part 15a and the valley side top part 15b which were mentioned above by the linear connection part 15c was demonstrated, not only this but the waveform of the circumferential groove 15, such as making the connection part 15c curved, Design changes can be made as appropriate. In any case, as shown in FIG. 2, the first imaginary line L1 passing through the central portion of the circumferential groove 15 along the bottle axis O direction, and the first imaginary line L1 and the second imaginary line L2 in the circumferential direction. The inclination angle θ formed by the tangent line passing through the intersection may be 15 ° or more.

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, in the range which does not deviate from the meaning of this invention, it is possible to replace suitably the component in the embodiment mentioned above by the known component, and you may combine each modification mentioned above suitably.

DESCRIPTION OF SYMBOLS 1 ... Bottle 13 ... Trunk part 15 ... Circumferential groove 15a ... Mountain side top part (top part) 15b ... Valley side top part (top part) 15c ... Connection part O ... Bottle axis

Claims (3)

The cylindrical body is a bottle formed with a plurality of circumferential grooves that are recessed toward the inside in the radial direction and extended over the entire circumference at intervals in the bottle axial direction,
Each of the circumferential grooves is formed in the same shape and size, and exhibits a wave shape that periodically extends along the circumferential direction while being bent in the bottle axial direction in a side view of the body portion.
Out of the circumferential grooves adjacent in the bottle axial direction, the circumferential positions of the tops on the mountain side in one circumferential groove and the tops on the mountain side and valley side in the other circumferential grooves adjacent to the one circumferential groove , And the top of the valley side in the one circumferential groove, and the circumferential position of the peak side and the valley side in the other circumferential groove are different, respectively.
In the side view of the trunk portion, the circumferential groove has a peak on the mountain side and the valley side, and a connecting portion that connects the peaks on the mountain side and the valley side is a straight line.
Among the connecting parts, in the side view of the body part, the inclination angle with respect to the circumferential direction of the connecting part located on the front surface overlapping the bottle shaft is 15 ° or more,
The minimum distance between the circumferential grooves adjacent in the bottle axial direction is equal to or greater than the amplitude in the bottle axial direction between the crests and the valley-side apexes in the circumferential groove.   The bottle according to claim 1, wherein the inclination angle is 20 ° to 55 °.   The bottle according to claim 1 or 2, wherein the body portion is gradually reduced in diameter from the outside toward the inside in the bottle axial direction.

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