JP5286074B2 - Bottle - Google Patents

Description

  The present invention relates to a bottle, and more particularly to a bottle formed of a synthetic resin.

Synthetic resin bottles such as PET bottles are lightweight and easy to handle, exhibit transparency comparable to glass containers while ensuring transparency, and are cost effective. Moreover, since it is cheap, it is frequently used mainly as a container for beverages.
By the way, since this kind of bottle has a thin barrel portion, when the inside of the bottle is in a decompressed state, the barrel portion is deformed into a distorted shape such as an elliptical shape or a triangular shape. When the body part is deformed in this way, there is a problem that not only the appearance beauty is impaired, but also the operability is deteriorated. In particular, when the wall thickness is reduced to reduce the weight of the bottle, it becomes more prominent.

  Therefore, in order to suppress unauthorized deformation of the body portion caused by a reduction (decompression) of the internal pressure of the container, a bottle having a decompression absorption panel provided on the body portion has been developed. However, this type of bottle is inevitably restricted by the reduced pressure absorption panel during design design, so that it cannot be freely designed, and there remains a problem in terms of design.

Apart from this, in recent years, there has been provided a panelless bottle capable of suppressing unauthorized deformation of the body during decompression without providing a reduced pressure absorption panel in the body (see Patent Document 1).
In this bottle, an annular groove is formed on the outer peripheral surface of the body part, and the body part can be contracted and deformed in the axial direction (vertical direction) around the annular groove. That is, this bottle is designed so that the pressure change at the time of decompression can be absorbed by shrinking and deforming the body portion in the axial direction.
JP 2005-280755 A

  However, depending on the degree of contraction deformation when the inside of the bottle is in a decompressed state, there is a possibility that the bottle mouth side may be illegally deformed, such as a neck bend, and the appearance may be deteriorated.

  The present invention has been made in consideration of such circumstances. The purpose of the present invention is to effectively absorb the pressure change generated at the time of decompression by contracting and deforming in the axial direction. Furthermore, it is providing the bottle which can suppress that illegal deformations, such as a neck bend, arise.

In order to achieve the above object, the present invention provides the following means.
The bottle according to the present invention is a bottle formed in a bottomed cylindrical shape, and is formed so as to be recessed radially inward along the outer peripheral surface of the trunk portion around the bottle axis, and the internal pressure is reduced. An annular groove that shrinks and deforms the body portion in the axial direction of the bottle shaft when the annular groove is formed, and the annular groove includes a first wall surface disposed on the mouth side and a second wall surface disposed on the bottom side. The body portion is formed so that the outer diameter on the bottom side is larger than the outer diameter on the mouth side across the annular groove, and the first wall surface is formed by the body portion. The second wall surface is formed in a curved shape from the radially inner side toward the outer peripheral surface of the body portion, and the first wall surface is The horizontal plane is perpendicular to the bottle axis .

In the bottle according to this invention, since the annular groove formed in the first wall surface and the second wall surface is formed over the entire circumference of the outer peripheral surface of the body portion, when the internal pressure is reduced, The body portion contracts and deforms in the axial direction around the annular groove. Thereby, the pressure change at the time of pressure reduction can be absorbed by contraction to the axial direction of a bottle.
By the way, the trunk | drum is formed so that an outer diameter may differ on both sides of an annular groove. That is, the outer diameter on the bottom side is larger than the outer diameter on the mouth side. Therefore, when the trunk portion contracts in the axial direction so that the annular groove is crushed by decompression, the trunk portion located on the mouth side with the annular groove as a boundary is supported on the trunk portion located on the bottom side. And the posture is stabilized. In particular, the body on the mouth side is not partially supported by the body on the bottom side, but is supported on the entire circumference, so the posture is very stable.

  Accordingly, in the contraction deformation in the axial direction, unauthorized deformation such as a neck bend in which the mouth side of the body portion is bent hardly occurs. Therefore, occurrence of appearance deterioration can be suppressed.

In the bottle according to the present invention, of the two wall surfaces constituting the annular groove, the first wall surface located on the mouth side is formed in a flat shape, and the second wall surface located on the bottom side is formed in a curved shape. Has been. In particular, since the second wall surface is formed in a curved surface shape (curved curved surface inward of the bottle) that curves from the radially inner side toward the outer peripheral surface of the body portion, the second wall surface is connected to the first wall surface. As it goes inward in the radial direction, the direction gradually changes so as to be parallel to the bottle axis. Therefore, when the internal pressure is reduced, the body on the mouth side can be easily pulled downward, and the contraction deformation in the axial direction can be more easily generated.
Usually, when contracting and deforming in the axial direction, it is natural that the body on the mouth side moves downward. In this respect, the second wall surface makes it easy to pull the body portion on the mouth side downward, so that it is possible to more easily cause contraction deformation in a form close to nature. Therefore, the pressure change at the time of pressure reduction can be absorbed more effectively.

In the bottle according to the present invention, since the first wall surface located on the mouth side is a horizontal plane perpendicular to the bottle axis, there is no plane parallel to the bottle axis. Therefore, the body portion on the mouth side can be more actively pulled downward by the second wall surface. Accordingly, the shrinkage deformation can be more actively promoted, and the pressure change at the time of decompression can be absorbed more effectively. Also, when the annular groove is contracted and deformed so as to be crushed, the first wall surface is a horizontal plane. Therefore, it is easy to ride in a state in which the body on the mouth side is more stable on the body on the bottom side, and the posture is further stabilized. Accordingly, unauthorized deformation such as neck bending can be more effectively suppressed.

  According to the bottle according to the present invention, it is possible to absorb the pressure change generated at the time of decompression by contracting and deforming in the axial direction. In addition, even when contraction deformation occurs as the annular groove is crushed, since the body portion on the mouth side is stably supported by the body portion on the bottom side, unauthorized deformation such as neck bending can be suppressed.

Hereinafter, an embodiment of the bottle according to the present invention will be described with reference to FIGS. 1 to 3. In the present embodiment, a round bottle formed in a circular cross section will be described as an example.
As shown in FIG. 1, the bottle 1 of the present embodiment has a bottomed cylindrical shape in which a mouth portion 2, a shoulder portion 3, a body portion 4, and a bottom portion 5 are integrally and continuously formed along a bottle axis L. Bottle 1. Specifically, it is integrally formed with a synthetic resin such as polyethylene terephthalate (PET), for example, by biaxial stretch blow molding.

  The body part 4 is provided continuously above the bottom part 5, and is a part formed in a cylindrical shape around the bottle axis L. The body 4 will be described later in detail. The shoulder portion 3 is a portion that is continuously provided so as to gradually reduce the diameter from the upper end of the body portion 4 upward. The mouth portion 2 is a portion that is continuously provided so as to extend upward from the upper end of the shoulder portion 3 and serves as a spout when pouring contents (not shown) filled in the bottle 1. In addition, a screw portion 2a to which a cap (not shown) is screwed is formed on the outer peripheral surface of the mouth portion 2.

  As shown in FIGS. 1 and 2, the body portion 4 is formed in a circular cross section around the bottle axis L. The body 4 has an annular groove 10 for contracting and deforming the body 4 along the axial direction of the bottle axis L when the internal pressure is reduced, and the rigidity of the bottle 1 is increased and pressure change at the time of pressure reduction. Four annular ribs 11, 12, 13, and 14 that absorb supplementarily and one annular reinforcing rib 15 that increases the rigidity of the bottle 1 are formed.

The annular groove 10 is a groove that is recessed inward in the radial direction along the outer peripheral surface of the body part 4 around the bottle axis L on the upper side of the body part 4 near the shoulder part 3.
Specifically, the annular groove 10 of the present embodiment is formed to be recessed with a first wall surface 10a disposed on the mouth portion 2 side and a second wall surface 10b disposed on the bottom portion 5 side. Of these two wall surfaces 10a and 10b, the first wall surface 10a is a flat (planar) wall surface extending radially inward from the outer peripheral surface of the body portion 4. More specifically, the horizontal plane extends so as to be orthogonal to the bottle axis L.
On the other hand, the second wall surface 10 b is a wall surface that connects the first wall surface 10 a and the outer peripheral surface of the body portion 4, and is a curved surface that curves smoothly from the radially inner side toward the outer peripheral surface of the body portion 4. It is formed in a curved shape convex to the inside of the bottle. In particular, the direction of the second wall surface 10b gradually changes so as to be parallel to the bottle axis L as it approaches the radially inner side connected to the first wall surface 10a.

  Thus, since the annular groove 10 is formed in the body portion 4 so as to be recessed over the entire circumference, the body portion 4 contracts and deforms in the axial direction of the bottle shaft L around the annular groove 10 when the internal pressure is reduced. It is possible. At this time, as shown in FIG. 3, contraction deformation is made possible to such an extent that the annular groove 10 is crushed, that is, to the extent that the first wall surface 10 a and the second wall surface 10 b are almost close to contact. Yes.

  By the way, as shown in FIG.1 and FIG.2, as for the trunk | drum 4, the outer diameter (phi) 1 by the side of the opening | mouth part 2 and the outer diameter (phi) 2 by the side of the bottom part 5 become different sizes on both sides of the annular groove 10. Is formed. Specifically, the outer diameter φ2 on the bottom portion 5 side is designed to be larger than the outer diameter φ1 on the mouth portion 2 side. Accordingly, when the annular groove 10 is contracted and deformed to such a degree that the annular groove 10 is crushed, as shown in FIG. 3, the trunk portion 4 located on the mouth portion 2 side with the annular groove 10 as a boundary is the trunk portion 4 located on the bottom portion 5 side. It is in a state of being supported by riding on it, and its posture is stabilized. This point will be described later in detail.

The four annular ribs 11, 12, 13, and 14 are all grooves that are recessed radially inward along the outer peripheral surface of the body portion 4, and mainly increase the rigidity of the entire bottle 1. The body 4 is deformed in the radial direction during decompression (for example, deformed into an elliptical section or a triangular section), gripping force when gripping the body 4, external force applied during production and distribution, etc. It plays the role which suppresses that 4 deform | transforms.
In addition to this main purpose, these annular ribs 11, 12, 13 and 14 cause the bottle 1 to contract and deform in the axial direction when the annular groove 10 cannot fully absorb the pressure change generated during decompression. It also plays an auxiliary role in absorbing the remaining pressure changes. Therefore, these annular ribs 11, 12, 13, 14 are formed to be shallower than the annular groove 10.

In particular, two of the four annular ribs 11, 12, 13, 14 are formed deeper than the remaining two annular ribs 13, 14. In other words, the two annular ribs 11 and 12 are ribs with a specific gravity slightly placed on the side in which the contraction deformation in the axial direction is promoted rather than the rigidity is increased. On the other hand, the remaining two annular ribs 13 and 14 are ribs on which the specific gravity is slightly increased in order to increase the rigidity rather than the contraction deformation in the axial direction.
The two types of annular ribs 11, 12, 13 and 14 having slightly different roles are alternately arranged from the bottom 5 side.

  In the present embodiment, the annular rib 11 is first disposed on the bottom 5 side, but the annular rib 13 may be disposed first on the contrary. Moreover, it is not necessary to alternate, and the balance of arrangement | positioning may be suitably changed according to the size, shape, etc. of the bottle 1. Further, the number is not limited to four, and the number may be appropriately changed.

  The annular reinforcing rib 15 is recessed inward in the radial direction over the entire circumference along the outer peripheral surface of the body portion 4 at a position closer to the shoulder portion 3 than the annular groove 10. The annular reinforcing rib 15 plays a role of suppressing the body portion 4 from being deformed in the radial direction during decompression, or the body portion 4 from being deformed by a gripping force when the body portion 4 is gripped. Therefore, the annular reinforcing rib 15 is also formed to be shallower than the annular groove 10 and is designed so that the body portion 4 does not substantially shrink and deform in the axial direction around the annular reinforcing rib 15. Yes.

Next, the case where the internal pressure of the bottle 1 configured in this way has been reduced for reasons such as cooling after heating and filling the contents will be described below.
When the internal pressure is reduced, a pressure for contracting in the axial direction of the bottle shaft L mainly acts on the entire bottle 1. At this time, since the annular groove 10 is formed in the body portion 4 so as to be recessed over the entire circumference, the body portion 4 contracts and deforms in the axial direction around the annular groove 10. Thereby, the said pressure change at the time of pressure reduction can be absorbed by shrinkage | contraction to the axial direction of the bottle 1. FIG.

By the way, the body 4 of the bottle 1 is designed so that the outer diameter φ2 on the bottom 5 side is larger than the outer diameter φ1 on the mouth 2 side. Therefore, as shown in FIG. 3, when the body portion 4 contracts in the axial direction so that the annular groove 10 is crushed by the reduced pressure, the body portion 4 on the mouth portion 2 side rides on and supports the body portion 4 on the bottom portion 5 side. The posture is stabilized. In particular, the body part 4 on the mouth part 2 side is not partially supported by the body part 4 on the bottom part 5 side, but is supported over the entire circumference, so the posture is very stable. .
Therefore, even if contraction deformation occurs due to the annular groove 10, unauthorized deformation such as neck bending that causes the mouth portion 2 side of the body portion 4 to be bent hardly occurs. Therefore, occurrence of appearance deterioration can be suppressed.

As described above, according to the bottle 1 of the present embodiment, it is possible to absorb the pressure change generated at the time of decompression by contracting and deforming the body portion 4 in the axial direction, and to perform unauthorized deformation such as neck bending in the contraction deformation. Can be suppressed.
In addition, since the bottle 11 of the present embodiment is provided with four annular ribs 11, 12, 13, and 14 in the body portion 4 separately from the annular groove 10, the pressure change that could not be absorbed by the annular groove 10 is reduced to four. It can be absorbed by contraction deformation around the annular ribs 11, 12, 13, and 14. Furthermore, since these four annular ribs 11, 12, 13, 14 and one annular reinforcing rib 15 increase the overall rigidity, not only the body 4 is not easily deformed during decompression, but also the bottle 1 It also has excellent radial rigidity when gripping.
In addition, since the bottle 1 is a panelless type bottle in which the body portion 4 is not provided with a general reduced pressure absorption panel, the design can be designed relatively freely without being restricted by the reduced pressure absorption panel. Therefore, the degree of freedom in design can be improved.

Moreover, in addition to the effect mentioned above, the bottle 1 of this embodiment can have the following effects.
That is, of the two wall surfaces constituting the annular groove 10, the second wall surface 10b positioned on the bottom 5 side is formed in a curved shape that curves from the radially inner side toward the outer peripheral surface of the trunk portion 4, The direction gradually changes so as to be parallel to the bottle axis L as it approaches the radially inner side that is provided continuously with the first wall surface 10a. Therefore, when the internal pressure is reduced, the body portion 4 on the mouth portion 2 side can be easily pulled downward, and shrinkage deformation in the axial direction can be more easily generated. Usually, when contracting and deforming in the axial direction, it is natural for the body 4 on the mouth 2 side to move downward. In this respect, the second wall surface 10b makes it easy to pull the body part 4 on the mouth part 2 side downward, so that shrinkage deformation can be more easily generated in a form close to nature. Therefore, the pressure change at the time of pressure reduction can be absorbed more effectively.

In addition, since the first wall surface 10a is a horizontal plane orthogonal to the bottle axis L, there is no plane parallel to the bottle axis L. Therefore, the body 4 on the mouth 2 side can be more actively pulled downward by the second wall surface 10b, and the pressure change during decompression can be absorbed more effectively.
In addition, since the first wall surface 10a is a horizontal surface, the body 4 on the mouth 2 side can be more easily ridden on the body 4 on the bottom 5 side. Accordingly, unauthorized deformation such as neck bending can be more effectively suppressed.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the bottle 1 is integrally formed by biaxial stretch blow molding of a synthetic resin such as PET, but the manufacturing method is not limited to this method. In addition, although the bottle 1 having the body portion 4 having a circular cross section has been described as an example, the body portion 4 may be a square bottle formed in a square shape.

Moreover, in the said embodiment, although the 1st wall surface 10a was made into the horizontal surface orthogonal to the bottle axis | shaft L, it is good also as a flat surface inclined with respect to the bottle axis | shaft L. Furthermore, a wall surface formed in a curved surface shape may be used similarly to the second wall surface 10b. However, a horizontal plane is preferable.
Moreover, you may connect the 1st wall surface 10a and the 2nd wall surface 10b through the connection wall. In this case, the cross-sectional shape of the annular groove 10 is substantially trapezoidal, and the connecting wall can be appropriately set according to the intended degree of deformation, such as a flat shape (parallel or inclined to the bottle axis L) or a curved shape.

It is a front view showing one embodiment of the bottle concerning the present invention. It is sectional drawing of the annular groove periphery of the bottle shown in FIG. It is a figure which shows the state which the trunk | drum contracted and deformed to the axial direction of the bottle axis | shaft from the state shown in FIG.

Explanation of symbols

L ... Bottle shaft φ1 ... Outer diameter of the barrel on the mouth side φ2 ... Outer diameter of the barrel on the bottom side 1 ... Bottle 2 ... Mouth part 4 ... Torre 5 ... Bottom 10 ... Annular groove 10a ... First wall 10b ... second wall

Claims (1)

A bottle formed into a bottomed cylindrical shape,
An annular groove is formed so as to be recessed radially inward along the outer peripheral surface of the barrel portion around the bottle shaft, and shrinks and deforms the barrel portion in the axial direction of the bottle shaft when the internal pressure is reduced. ,
The annular groove is formed to be recessed with a first wall surface disposed on the mouth side and a second wall surface disposed on the bottom side,
The trunk is formed such that the outer diameter on the bottom side is larger than the outer diameter on the mouth side across the annular groove ,
The first wall surface is formed in a planar shape from the outer peripheral surface of the body portion toward the radially inner side,
The second wall surface is formed in a curved shape from the radially inner side toward the outer peripheral surface of the body part,
The bottle, wherein the first wall surface is a horizontal plane orthogonal to the bottle axis .

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