JP6999265B2 - Resin container - Google Patents

Description

The present invention relates to a resin container provided with a vacuum absorbing unit.

As a conventional resin container, for example, as shown in Patent Document 1, a PET bottle having a pressure reducing absorption portion on each of the upper side and the lower side of the body portion is known. The decompression absorbing portion is formed by being depressed one step lower from the side surface of the PET bottle, and is curved and displaced in response to the fluctuation of the internal pressure and the volume fluctuation of the content liquid to prevent the PET bottle from being deformed.

Japanese Unexamined Patent Publication No. 2004-299758

However, the above-mentioned conventional PET bottle has a drawback that the container is easily deformed due to the decompression of the content liquid due to the permeation of water over time, and there is room for improvement. Therefore, an object of the present invention is to provide a resin container that is less likely to be deformed by decompression of the content liquid due to permeation of water over time while maintaining the buckling strength of the resin container.

The characteristic configuration of the resin container of the present invention is that the mouth portion to which the cap can be attached and detached, the shoulder portion connected to the mouth portion, the body portion connected to the shoulder portion, and the body portion connected to the body portion. It is provided with a bottom portion located at the lowermost portion, and is provided with a decompression absorption portion formed in a recessed portion in the body portion. A tapered region having a narrower and shallower width is formed on the lower side of the decompression absorption portion , and the decompression absorption portion has a constant width of the same width as the tapered region and the maximum width of the tapered region. The point is that a certain region having a certain region and an enlarged region whose width gradually increases from the constant region are continuously provided in order from the top or the bottom .

A further characteristic configuration of the resin container of the present invention is that the vacuum absorbing portion is recessed and formed over both the upper half and the lower half of the body portion.

A further characteristic configuration of the resin container of the present invention is that the upper end or the lower end of the pressure reducing absorption portion is continuously connected to the side surface of the body portion.

A further characteristic configuration of the resin container of the present invention is that the tapered region is provided in the upper half or the lower half of the body portion.

A further characteristic configuration of the resin container of the present invention is that the vacuum absorbing portion is formed with a concave portion that is convex inside the container or a protruding portion that is convex outside the container.

A further characteristic configuration of the resin container of the present invention is that the recess or the protrusion is a rhombic quadrangular pyramid.

As in this configuration, is there a decompression absorption section that is recessed and formed over both the upper and lower halves of the body, and is there a tapered region on the upper side of the decompression absorption section that is narrower and shallower toward the upper side? Or, by forming a tapered region on the lower side of the decompression absorption portion, the width becomes narrower and shallower toward the lower side, so that the buckling strength is maintained and the decompression of the content liquid due to the permeation of water over time is performed. Deformation is less likely to occur. Further, when a label such as a shrink label is applied to the tapered region, the shape of the tapered region is closer to flush with the body on the upper side or the lower side of the tapered region. Easy to do.

It is a perspective view of a resin container. It is a side view of a resin container. It is a vertical sectional view of the resin container in the arrow line III-III of FIG. It is an enlarged view of the decompression absorption part. It is a vertical sectional view of the bottom of a resin container. It is an enlarged view near the connection part of the shoulder part and the body part in the other embodiment of the resin container.

[Embodiment]
Hereinafter, as a preferred embodiment of the resin container according to the present invention, a plastic bottle 1 filled with a liquid such as a beverage will be described with reference to the drawings.

First, various terms used in the present specification are defined as follows.
In the present specification, the "vertical direction" means the direction of the central axis XX of the plastic bottle 1 (hereinafter, abbreviated as bottle 1) of FIG. In particular, in FIGS. 1 to 3, the upper side means the upper end side of the drawing, and the lower side means the lower end side of the drawing.
The "horizontal direction" or "horizontal direction" means a direction orthogonal to the central axis XX direction.
The "circumferential direction" means a direction along the contour of the cross-sectional shape.
The "radial direction" means the radial direction of the circle when the central axis XX is considered as the center of the circle.
"Height" means a length along the central axis XX direction.
"Depth" means a length along the radial direction.
The “cross-sectional shape” means the cross-sectional shape of the bottle 1 in a plane (cross-sectional shape) orthogonal to the central axis XX.
The "vertical cross-sectional shape" means the cross-sectional shape of the bottle 1 in a plane (longitudinal cross section) along the central axis XX.

As shown in FIGS. 1 to 3, the bottle 1 according to the present embodiment has a mouth portion 2 to which a cap can be attached and detached, a shoulder portion 3 connected to the mouth portion 2, and a shoulder portion 3 in this order from above. A body portion 4 connected to the body portion 4 and a bottom portion 11 connected to the body portion 4 and located at the lowermost portion are provided. Further, the bottle 1 according to the present embodiment is a cylindrical container having a substantially circular cross section.

The bottle 1 can be manufactured by a known molding method such as a biaxial stretch blow molding method using a thermoplastic resin such as polyethylene, polypropylene, or polyethylene terephthalate as a main material.

The liquid to be filled in the bottle 1 is not particularly limited, and for example, beverages such as drinking water, tea, fruit juice, coffee, cocoa, refreshing drinking water, alcoholic beverages, milk beverages, soups, sauces and soy sauces. Examples include liquid seasonings such as. Further, the content of the bottle 1 is not particularly limited, and depending on the type of liquid to be filled, etc., the content of the bottle 1 can be changed from a relatively small capacity of several hundred milliliters to a relatively large capacity of several liters. It may be applied arbitrarily up to. When the bottle 1 is applied as a beverage bottle, it is desirable that the content is 500 to 550 mL.

(Mouth)
The mouth portion 2 is a portion composed of a cylinder having an open upper end, and functions as a spout for beverages and the like. A male screw portion is formed on the outer peripheral surface of the mouth portion 2, and a cap (not shown) is detachably screwed and fixed.

(Shoulder)
The shoulder portion 3 is a portion having a substantially conical shape, which is continuously expanded in diameter from the upper end to the lower side. It is desirable that the vertical cross-sectional shape of the shoulder portion 3 is a gentle arc (for example, radius of curvature = 250 mm (250R)) that is convex to the outside of the container.

(Torso)
The body portion 4 is continuously reduced in diameter from the upper end to the lower side, and then continuously expanded in diameter from a position approximately half of the body portion 4 in the vertical direction to be continuously provided on the bottom portion 11. The vertical cross-sectional shape of the body portion 4 in the present embodiment is configured by connecting two arcs having different radii of curvature. In the present embodiment, the radius of curvature of the arc in the upper half of the body 4 is set to be smaller than the radius of curvature of the arc in the lower half of the body 4. The radius of curvature of the arc in the upper half of the body 4 is, for example, 600 mm (600R), and the radius of curvature of the arc in the lower half of the body 4 is, for example, 1052 mm (1052R).

A plurality of decompression absorbing portions 5 are formed in the body portion 4 by being depressed at predetermined intervals in the circumferential direction. The decompression absorbing portion 5 in the present embodiment is formed by being depressed over both the upper half and the lower half of the body portion 4. A tapered region 6 having a narrower and shallower width is formed on the upper side of the decompression absorption unit 5. In the present embodiment, the tapered region 6 is provided in the upper half of the body portion 4.

As shown in FIG. 4, the decompression absorption unit 5 includes a tapered region 6, a constant region 7 having a constant width equal to the maximum width of the tapered region 6, and an enlarged region whose width gradually increases from the constant region 7. 8 and 8 are connected in order from the top. A groove 9 having a V-shaped cross section is formed along the contour of the decompression absorbing portion 5, and the groove 9 at the upper end of the decompression absorbing portion 5 is continuously connected to the side surface of the body portion 4.

Although not shown, the above-mentioned decompression absorption unit 5 may be turned upside down. In this case, the tapered region 6, the constant region 7, and the enlarged region 8 are connected in order from the bottom, and the groove 9 at the lower end of the decompression absorbing portion 5 is continuously connected to the side surface of the body portion 4. .. Further, the tapered region 6 is provided in the lower half of the body portion 4.

The reduced pressure absorbing portion 5 is formed with a concave portion 10 that is convex inside the container. In the present embodiment, the rhombic quadrangular pyramid-shaped recessed portion 10 is formed over a part of the constant region 7 and a part of the enlarged region 8, but the shape and the set position of the recessed portion 10 are the same. Not limited to. The decompression absorbing portion 5 may be formed with a protruding portion that is convex on the outside of the container instead of the recessed portion 10. In this case as well, the rhombic quadrangular pyramid-shaped protrusion may be formed over a part of the constant region 7 and a part of the enlarged region 8, as in the case of the recess 10, but the shape and setting position of the protrusion may be different. Is not limited to the configuration.

It is desirable that the ratio of the sum of the surface areas of the tapered region 6, the constant region 7, and the enlarged region 8 to the total surface area of the bottle 1 is approximately 30% to 45%.

(Connecting part between shoulder and torso)
As shown in FIG. 3, the vertical cross-sectional shape of the connecting portion C between the shoulder portion 3 and the body portion 4 is formed in an arc shape that is convex to the outside of the container. The radius of curvature of the connecting portion C is 1.5 to 5 mm (1.5R to 5R), more preferably 1.5 to 3.5 mm (1.5R to 3.5R). The shape from the lower end portion of the shoulder portion 3 to the connection portion C and the upper end portion of the body portion 4 is curved so as to protrude laterally outward of the container.

(Connecting part between the body and the bottom)
As shown in FIGS. 1 to 3, a peripheral groove 20 is formed over the entire circumference at the connecting portion between the body portion 4 and the bottom portion 11. The peripheral groove 20 functions as a reinforcing rib that reinforces the strength against an impact or a load applied to the side surface of the bottle 1.
As shown in FIG. 5, the vertical cross-sectional shape of the peripheral groove 20 has an arc 21 with an edge convex to the outside of the container, an arc 23 with a bottom convex to the inside of the container, and an arc with an edge convex to the outside of the container. 22 is configured to be connected in order from the upper side. The radius of curvature of the edge arcs 21 and 22 is preferably larger than the radius of curvature of the bottom arc 23. For example, the radius of curvature of the edge arcs 21 and 22 is 2 mm (2R) and the curvature of the bottom arc 23. The radius is 1.5 mm (1.5R). Further, it is desirable that the depth of the peripheral groove 20 is, for example, 1 to 1.5 mm.

(bottom)
As shown in FIG. 5, the bottom portion 11 includes a side wall 12 and a bottom wall 13. At the lower end of the side wall 12, a step 14 recessed inward along the circumferential direction is formed.
The vertical cross-sectional shape of the step 14 consists of a first curved portion 15 that is convex to the outside of the container, a second curved portion 16 that is convex to the inside of the container, and a third curved portion 17 that is convex to the outside of the container. It is composed of shapes that are connected in order. It is desirable that the radius of curvature of the second curved portion 16 is smaller than the radius of curvature of the first curved portion 15. Further, it is desirable that the radius of curvature of each of the first curved portion 15, the second curved portion 16, and the third curved portion 17 is 5 mm (5R) or less, and for example, the radius of curvature of the first curved portion 15 Is 3 mm (3R), the radius of curvature of the second curved portion 16 is 1.5 mm (1.5R), and the radius of curvature of the third curved portion 17 is 2 mm (2R). Further, the height of the step 14 is preferably 4 mm or less.

Further, the vertical cross-sectional shape of the step portion 14 is not limited to the above-mentioned configuration, and is between the first curved portion 15 and the second curved portion 16 and / or the second curved portion 16 and the third curve. A straight line portion may be provided between the portion 17 and the portion 17.

The bottom wall 13 of the bottom portion 11 is configured to include a recessed portion 18 recessed inside the container and a bottom surface 19 that comes into contact with the installation surface when the bottle 1 is erected. The vertical cross-sectional shape of the recessed portion 18 is a circular dome shape that is recessed in a stepped shape. The bottom surface 19 has a ring shape in a plan view and is arranged on the outer periphery of the recessed portion 18.

It is desirable that the diameter reduction ratio of the maximum outer diameter T2 of the bottom surface 19 with respect to the maximum outer diameter T1 of the side wall 12 of the bottom portion 11 is 60% to 90%.

[Other embodiments]
Regarding the shape from the lower end portion of the shoulder portion 3 to the upper end portion of the connecting portion C and the body portion 4 in the above-described embodiment, for example, as shown in FIG. 6, the degree of lateral protrusion of the container is further increased. It may have a large shape. In this embodiment, an arc 24 that is convex inside the container is formed at the upper end portion of the body portion 4, and the arc 24 is continuously provided at the connection portion C. The radius of curvature of the arc 24 is larger than the radius of curvature of the connecting portion, for example, 10 to 20 mm (10R to 20R).

The resin container of the present invention can be suitably used as a container for sealing and filling beverages, seasonings and the like.

1 Bottle 2 Mouth 3 Shoulder 4 Body 5 Decompression absorption 6 Tapered area 7 Constant area 8 Enlarged area 9 V-shaped groove in cross section 10 Rhombus square cone-shaped recess 11 Bottom 12 Side wall 13 Bottom wall 14 Step 15 No. 1 Curved part 16 2nd curved part 17 3rd curved part 18 Recessed part 19 Bottom surface 20 Circumferential groove 21, 22 Edge arc 23 Bottom arc 24 Arc T1 Maximum outer diameter of side wall of bottom T2 Maximum of bottom surface Outer diameter C Connection part between shoulder and body

Claims (6)

It has a mouth part with a detachable cap, a shoulder part connected to the mouth part, a body part connected to the shoulder part, and a bottom part connected to the body part and located at the bottom.
It is provided with a decompression absorption portion that is formed by being depressed in the body portion.
A tapered region having a narrower and shallower width is formed on the upper side of the decompression absorption portion, or a tapered region having a narrower and shallower width is formed on the lower side of the decompression absorption portion. ,
The decompression absorption unit has a tapered region, a constant region having the same width as the maximum width of the tapered region, and an enlarged region whose width gradually increases from the constant region, in order from the top or the bottom. A resin container characterized by being configured in a series . The resin container according to claim 1, wherein the vacuum absorbing portion is formed by being depressed over both the upper half and the lower half of the body portion. The resin container according to claim 1 or 2, wherein the upper end or the lower end of the decompression absorbing portion is continuously connected to the side surface of the body portion. The resin container according to any one of claims 1 to 3 , wherein the tapered region is provided in the upper half or the lower half of the body portion. The invention according to any one of claims 1 to 4 , wherein the vacuum absorbing portion has a concave portion that is convex inside the container or a protruding portion that is convex outside the container. The resin container described. The resin container according to claim 5 , wherein the recess or the protrusion has a rhombic quadrangular pyramid shape.

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