JP6878078B2 - Decompression absorption bottle - Google Patents

Description

The present invention relates to a vacuum absorption bottle.

Conventionally, as a decompression absorption bottle formed of a synthetic resin material in a bottomed tubular shape, for example, as shown in Patent Document 1 below, the bottom wall portion of the bottom portion is a ground contact portion located on the outer peripheral edge portion and a ground contact portion. The movable wall portion is provided with a rising peripheral wall portion that is continuous from the inside in the bottle radial direction and extends upward, and a movable wall portion that extends inward in the bottle radial direction from the upper end portion of the rising peripheral wall portion. It is known that the pressure inside the bottle is absorbed by rotating the bottle upward with respect to the connecting portion with the bottle.
In this type of decompression absorption bottle, if the bottom wall portion is deformed at the time of filling the contents and the movable wall portion is largely displaced downward and sealed, a large decompression absorption capacity can be secured.
As a means for increasing the decompression absorption capacity, by adopting a configuration in which the rising peripheral wall portion is greatly inclined inward in the bottle radial direction, the bottle is placed in the bottom wall portion of the bottom wall portion rather than the ground contact portion when the contents are filled. It is conceivable that the entire portion located inside in the radial direction can be easily displaced downward.

Japanese Unexamined Patent Publication No. 2013-23278

However, in such a decompression absorption bottle, when the contents are filled, the rising peripheral wall portion rotates downward about the connection portion with the ground contact portion, so that the ground contact portion, for example, a part thereof is locally localized. There is a risk that improper deformation such as large deformation will occur and the grounding stability will be impaired.

Therefore, an object of the present invention is to provide a decompression absorption bottle capable of increasing the decompression absorption capacity without impairing grounding stability.

The present invention employs the following means to solve the above problems. That is, the decompression absorption bottle of the present invention is a bottomed tubular decompression absorption bottle made of a synthetic resin material, and the bottom wall portion of the bottom is a ground contact portion located on the outer peripheral edge portion and the ground contact portion. The movable wall portion includes a rising peripheral wall portion that is continuous from the inside in the bottle radial direction and extends upward, and a movable wall portion that extends inward in the bottle radial direction from the upper end portion of the rising peripheral wall portion. It is rotatably arranged in the vertical direction around the connection portion with the peripheral wall portion, and the outer end portion of the movable wall portion in the bottle radial direction is gradually arranged from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction. It is characterized by having an inclined portion that gradually extends upward.

In the present invention, the outer end portion of the movable wall portion in the bottle radial direction is an inclined portion that gradually extends upward from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction. At the time of filling, the movable wall portion is easily rotated downward around the connection portion between the upper end portion of the rising peripheral wall portion and the inclined portion, and the displacement toward the lower side of the movable wall portion at the time of filling the contents. The amount can be increased, and the reduced pressure absorption capacity in the sealed state can be increased.
Moreover, when the contents are filled, the movable wall portion rotates downward with the connection portion between the upper end portion and the inclined portion of the rising peripheral wall portion separated upward from the ground contact portion, so that the movable wall portion It is possible to prevent the ground contact portion from being deformed when the displacement is directed downward.
From the above, the reduced pressure absorption capacity can be increased without impairing the grounding stability.

Here, in the vertical cross-sectional view along the bottle axis direction, the radius of curvature of the connecting portion between the inclined portion and the upper end portion of the rising peripheral wall portion is the bottle diameter of the inclined portion in the inclined portion of the movable wall portion. It may be larger than the radius of curvature of the connecting portion between the inner portion extending from the inside in the direction and the inclined portion.

In this case, in the vertical cross-sectional view, the radius of curvature of the connecting portion between the inclined portion and the upper end portion of the rising peripheral wall portion is larger than the radius of curvature of the connecting portion between the inner portion and the inclined portion. The movable wall portion can be easily rotated downward about the connecting portion between the inclined portion and the upper end portion of the rising peripheral wall portion.

Further, the movable wall portion is formed in an annular shape, and the bottom wall portion includes a recessed peripheral wall portion extending upward from the inner end portion in the bottle radial direction of the movable wall portion, and is vertically traversed along the bottle axial direction. In terms of view, the length of the inner portion of the movable wall portion that is connected to the inclined portion from the inside of the inclined portion in the bottle radial direction and is connected to the depressed peripheral wall portion from the outside of the depressed peripheral wall portion in the bottle radial direction. May be longer than the length of the inclined portion.

In this case, since the length of the inner portion is longer than the length of the inclined portion in the vertical cross-sectional view, the movable wall portion stands up with the inclined portion while suppressing the deformation of the inclined portion when filling the contents. It is possible to rotate the peripheral wall portion downward with the connection portion with the upper end portion as the center, and it is possible to effectively increase the amount of displacement of the movable wall portion downward when the contents are filled. ..

According to the present invention, the reduced pressure absorption capacity can be increased without impairing the grounding stability.

It is a partial cross-sectional side view of the decompression absorption bottle shown as one Embodiment which concerns on this invention. It is a semi-vertical sectional view of the bottom of the decompression absorption bottle shown in FIG. It is a semi-vertical sectional view of the bottom of the decompression absorption bottle shown as a comparative example which concerns on this invention.

Hereinafter, the vacuum absorption bottle according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the decompression absorption bottle 1 according to the present embodiment includes a mouth portion 11, a shoulder portion 12, a body portion 13 and a bottom portion 14, and these 11 to 14 have their respective central axes on a common axis. It has a schematic configuration in which they are connected in this order in the state of being positioned at.

Hereinafter, the common shaft is referred to as a bottle shaft O, the mouth 11 side is referred to as an upper side along the bottle shaft O direction, the bottom 14 side is referred to as a lower side, the direction along the bottle shaft O is referred to as a vertical direction, and the vertical direction is also referred to. The direction orthogonal to the bottle axis O when viewed from the direction is called the bottle radial direction, and the direction orbiting around the bottle axis O is called the bottle circumferential direction.
The vacuum absorption bottle 1 is formed by blow molding a preform formed into a bottomed tubular shape by injection molding, and is integrally formed of a synthetic resin material. A cap (not shown) is attached to the mouth portion 11. The mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 each have a circular cross-sectional view shape orthogonal to the bottle axis O.

The body portion 13 is formed in a tubular shape, and the intermediate portion between the upper end portion and the lower end portion is formed to have a smaller diameter than the upper end portion and the lower end portion.
A first annular groove 16 extending continuously over the entire circumference is formed at the connecting portion between the shoulder portion 12 and the body portion 13. A plurality of second annular concave grooves 15 extending continuously over the entire circumference are formed in the body portion 13 at intervals in the vertical direction. A third annular concave groove 20 extending continuously over the entire circumference is formed at the connecting portion between the body portion 13 and the bottom portion 14.
The bottom portion 14 has a tubular heel portion 17 in which the upper end opening is connected to the lower end opening of the body portion 13 and a bottom in which the lower end opening of the heel portion 17 is closed and the outer peripheral edge portion is a ground contact portion 18. It is formed in a cup shape including a wall portion 19. A fourth annular groove 31 is continuously formed in the heel portion 17 over the entire circumference.

As shown in FIG. 2, the bottom wall portion 19 is connected to the ground contact portion 18 from the inside in the bottle radial direction and extends upward, and the rising peripheral wall portion 21 is directed from the upper end portion of the rising peripheral wall portion 21 toward the inside in the bottle radial direction. The movable wall portion 22 extends upward from the inner end portion of the movable wall portion 22 in the bottle radial direction, and the depressed peripheral wall portion 23 extends upward.

The rising peripheral wall portion 21 extends substantially straight along the vertical direction. The rising peripheral wall portion 21 may extend in parallel with the bottle shaft O, or in consideration of mold releasability, the rising peripheral wall portion 21 moves up and down so as to gradually extend inward in the bottle radial direction from the lower side to the upper side. It may be tilted by 5 ° or less, preferably 2 ° or less with respect to the direction. In the illustrated example, this inclination angle of the rising peripheral wall portion 21 is, for example, about 1.5 °.
The depressed peripheral wall portion 23 is arranged coaxially with the bottle shaft O, and its diameter is gradually increased from the upper side to the lower side. A disk-shaped top wall 24 arranged coaxially with the bottle shaft O is connected to the upper end of the depressed peripheral wall portion 23, and the depressed peripheral wall portion 23 and the top wall 24 as a whole form an ecstatic cylinder. There is. The depressed peripheral wall portion 23 is formed in a circular shape in a cross-sectional view. The depressed peripheral wall portion 23 extends downward from the outer peripheral edge portion of the top wall 24, and has an upper wall portion 23a formed in a protruding curved shape toward the inside in the bottle diameter direction and a bottle diameter of the movable wall portion 22. A lower wall portion 23c that extends upward from the inner end portion in the direction and is formed in a curved shape with a protrusion toward the inside in the bottle radial direction, and a lower end portion of the upper wall portion 23a and an upper end portion of the lower wall portion 23c. A bent portion 23b formed in a concave curved shape that is recessed toward the outside in the radial direction of the bottle is provided.

The movable wall portion 22 is formed in an annular shape and is arranged coaxially with the bottle shaft O. Of the movable wall portions 22, the outer end portion in the bottle radial direction is connected to the upper end portion of the rising peripheral wall portion 21, and the inner end portion in the bottle radial direction is connected to the lower end portion of the depressed peripheral wall portion 23. The outer end portion of the movable wall portion 22 in the bottle radial direction and the upper end portion of the rising peripheral wall portion 21 are connected to each other via a first curved surface portion 25 that is recessed toward the outside in the bottle radial direction. The movable wall portion 22 is rotatable around a first curved surface portion (connecting portion with the rising peripheral wall portion 21) 25 so as to move the depressed peripheral wall portion 23 in the vertical direction.

Then, in the present embodiment, the outer end portion of the movable wall portion 22 in the bottle radial direction becomes an inclined portion 26 that gradually extends upward from the upper end portion of the rising peripheral wall portion 21 toward the inside in the bottle radial direction. There is. The inclination angle θ1 of the inclined portion 26 with respect to the vertical direction is larger than the inclination angle of the rising peripheral wall portion 21 with respect to the vertical direction. In the vertical cross-sectional view along the vertical direction, the length of the inclined portion 26 is the same as or slightly shorter than the length of the rising peripheral wall portion 21. Not limited to this, the length of the inclined portion 26 may be longer than the length of the rising peripheral wall portion 21 in the vertical cross-sectional view.

In the movable wall portion 22, the inner portion 27 which is connected to the inclined portion 26 from the inside of the inclined portion 26 in the bottle radial direction and which is connected to the depressed peripheral wall portion 23 from the outside of the depressed peripheral wall portion 23 in the bottle radial direction protrudes downward. It is formed in the shape of a curved surface, and gradually extends downward from the outside to the inside in the radial direction of the bottle. The inner portion 27 may be formed in a flat shape. The inner end portion of the inner portion 27 in the bottle radial direction is connected to the lower end portion of the depressed peripheral wall portion 23. The inclination angle θ2 of the outer end portion in the bottle radial direction in the inner portion 27 with respect to the vertical direction is larger than the inclination angle θ1 of the inclined portion 26 with respect to the vertical direction. Not limited to this, the inclination angle θ2 may be set to the inclination angle θ1 or less. The inner portion 27 and the inclined portion 26 are connected to each other via a second curved surface portion 28 that is recessed upward.

In the vertical cross-sectional view, the radius of curvature of the first curved surface portion 25 connecting the inclined portion 26 and the upper end portion of the rising peripheral wall portion 21 is the radius of curvature of the second curved surface portion 28 connecting the inner portion 27 and the inclined portion 26. It's getting bigger. Not limited to this, the radius of curvature of the first curved surface portion 25 may be equal to or less than the radius of curvature of the second curved surface portion 28 in the vertical cross-sectional view.
Further, in the vertical cross-sectional view, the length of the inner portion 27 is longer than the length of the inclined portion 26. In the illustrated example, the inner portion 27 is also longer than the inclined portion 26 in the length along the bottle radial direction. Not limited to this, in the vertical cross-sectional view, the length of the inner portion 27 may be less than or equal to the length of the inclined portion 26, and the length of the inner portion 27 along the bottle diameter direction of the inclined portion 26 may be set. The length may be less than or equal to the length along the bottle diameter direction.

The decompression absorption bottle 1 configured as described above is filled with the contents of a high temperature (for example, about 40 ° C. to 95 ° C.), and at this time, the bottom wall portion 19 is deformed and the movable wall portion 22 is directed downward. And displace. By sealing in this state, when the pressure inside the decompression absorption bottle 1 is reduced due to the subsequent cooling, the bottom wall portion 19 is deformed and the movable wall portion 22 is displaced upward, and this decompression is absorbed.

As described above, according to the decompression absorption bottle 1 according to the present embodiment, since the inclined portion 26 is formed at the outer end portion of the movable wall portion 22 in the bottle radial direction, the movable wall portion is formed when the contents are filled. The 22 is easily rotated downward around the first curved surface portion 25 connecting the upper end portion of the rising peripheral wall portion 21 and the inclined portion 26, and is below the movable wall portion 22 when the contents are filled. It is possible to increase the amount of displacement toward the surface, and it is possible to increase the decompression absorption capacity in the sealed state.
Moreover, when the contents are filled, the movable wall portion 22 rotates downward with respect to the first curved surface portion 25 separated upward from the ground contact portion 18, so that the movable wall portion 22 is displaced downward. It is possible to prevent the ground contact portion 18 from being deformed at times.
From the above, the reduced pressure absorption capacity can be increased without impairing the grounding stability.

Further, in the vertical cross-sectional view, the radius of curvature of the first curved surface portion 25 connecting the inclined portion 26 and the upper end portion of the rising peripheral wall portion 21 is the radius of curvature of the second curved surface portion 28 connecting the inner portion 27 and the inclined portion 26. Since it is larger than the radius of curvature, the movable wall portion 22 can be easily rotated downward with respect to the first curved surface portion 25 when filling the contents.
Further, since the length of the inner portion 27 is longer than the length of the inclined portion 26 in the vertical cross-sectional view, the movable wall portion 22 is formed on the first curved surface while suppressing the deformation of the inclined portion 26 when filling the contents. It becomes possible to rotate the portion 25 downward with respect to the center, and it is possible to effectively increase the amount of displacement of the movable wall portion 22 downward during filling of the contents.

Next, the verification test of the action and effect described above will be described.

As an example, the decompression absorption bottle 1 shown in FIGS. 1 and 2 was adopted, and as a comparative example, the decompression absorption bottle 100 shown in FIG. 3 was adopted.
In the decompression absorption bottle 100 of the comparative example, the movable wall portion 122 does not have the inclined portion 26, and the rising peripheral wall portion 121 gradually extends inward in the bottle radial direction as it goes upward. The inclination angle with respect to the vertical direction is larger than that of the rising peripheral wall portion 21 of the above. The tilt angle of the rising peripheral wall portion 121 is 19 °, and the tilt angle of the rising peripheral wall portion 21 of the embodiment is 1.5 °. The inclination angle θ1 of the inclined portion 26 of the embodiment is 38 °. In the vertical cross-sectional view, the length of the rising peripheral wall portion 121 of the comparative example is about twice the length of the rising peripheral wall portion 21 of the embodiment. The inner portions 27 of each of the examples and the comparative examples have the same size and the same shape as each other. The first curved surface portion 25 of the embodiment is located outside the rising peripheral wall portion 121 of the comparative example in the bottle radial direction. Further, in the decompression absorption bottle 100 of the comparative example, the outer end portion of the movable wall portion 122 in the bottle radial direction and the upper end portion of the rising peripheral wall portion 121 are connected to each other via a third curved surface portion 125 that is recessed upward. Has been done. In the vertical cross-sectional view, the radius of curvature of the third curved surface portion 125 is smaller than the radius of curvature of the second curved surface portion 28 of the embodiment. The positions in the bottle radial direction and the positions in the vertical direction with respect to the ground contact portion 18 of the third curved surface portion 125 and the second curved surface portion 28 of the embodiment are coincident with each other.

Then, the displacement of the bottom wall portion when an internal pressure of 20 kPa was applied to each of the bottles 1 and 100 of the examples and the comparative examples was analyzed.
As a result, it was confirmed that the amount of displacement in the most downwardly displaced portion of the bottom wall portion was 6% larger in the example than in the comparative example. Further, in the decompression absorption bottle 1 of the embodiment, the movable wall portion 22 rotates downward with respect to the first curved surface portion 25, while in the decompression absorption bottle 100 of the comparative example, the rising peripheral wall portion 121 is grounded. It was confirmed that the bottle rotated downward with the connection portion with the portion 18 as the center.

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

For example, the depressed peripheral wall portion 23 is not limited to the above-described embodiment, and may be appropriately changed such as extending straight along the vertical direction.
Further, the bottom wall portion 19 does not have the depressed peripheral wall portion 23, and for example, the entire portion located inside the rising peripheral wall portion 21 in the bottle radial direction is composed of the movable wall portion, or the movable wall portion 22. A configuration in which a flat wall portion orthogonal to the bottle axis O is connected to the inner end portion in the bottle radial direction may be adopted.
Further, a configuration having no top wall 24 as the bottom wall portion 19 may be adopted.
Further, the synthetic resin material forming the vacuum absorption bottle 1 may be appropriately changed, for example, polyethylene terephthalate, polyethylene naphthalate, amorphous polyester, or a blend material thereof.
Further, the decompression absorption bottle 1 is not limited to the 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, a layer made of a resin material having an oxygen absorption property, and the like.
Further, in the above embodiment, the cross-sectional view shape orthogonal to the bottle axis O of each of the mouth portion 11, the shoulder portion 12, the body portion 13 and the bottom portion 14 is a circular shape, but the cross-sectional view shape is not limited to this, and is not limited to this, for example, a square shape. It may be changed as appropriate.

In addition, it is possible to replace the constituent elements in the embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the modified examples may be appropriately combined.

1 Decompression absorption bottle 14 Bottom 18 Grounding part 19 Bottom wall part 21 Rising peripheral wall part 22 Movable wall part 23 Depressed peripheral wall part 25 First curved surface part 26 Inclined part 27 Inner part 28 Second curved surface part

Claims (3)

A bottomed tubular decompression absorption bottle made of synthetic resin material.
The bottom wall of the bottom is
The grounding part located on the outer peripheral edge and
A rising peripheral wall portion that is connected to the ground contact portion from the inside in the bottle radial direction and extends upward.
A movable wall portion extending inward in the bottle radial direction from the upper end portion of the rising peripheral wall portion is provided.
The movable wall portion is rotatably arranged in the vertical direction around a connection portion with the rising peripheral wall portion.
The outer end portion of the movable wall portion in the bottle radial direction is a decompression absorption portion that gradually extends upward from the upper end portion of the rising peripheral wall portion toward the inside in the bottle radial direction. Bottle. In the vertical cross-sectional view along the bottle axis direction, the radius of curvature of the connecting portion between the inclined portion and the upper end portion of the rising peripheral wall portion is the inside of the inclined portion in the bottle radial direction of the movable wall portion. The decompression absorption bottle according to claim 1, wherein the bottle is larger than the radius of curvature of the connecting portion between the inner portion connected to the inner portion and the inclined portion. The movable wall portion is formed in an annular shape, and the bottom wall portion includes a depressed peripheral wall portion extending upward from the inner end portion in the bottle radial direction of the movable wall portion.
In a vertical cross-sectional view along the bottle axis direction, among the movable wall portions, the inclined portion is connected to the inclined portion from the inside in the bottle radial direction, and the depressed peripheral wall portion is connected to the depressed peripheral wall portion from the outside in the bottle radial direction. The decompression absorption bottle according to claim 1 or 2, wherein the length of the continuous inner portion is longer than the length of the inclined portion.

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