JPH07137724A - Resin-made bottle container - Google Patents

Abstract

PURPOSE:To confine a deformable area of a resin-made bottle container to a specified area where deformation occurs when the container is depressurized inside to prevent the commodity value from being spoiled, by a method wherein at least an area on the barrel of the container along the axis of the barrel is designated as a deformable area and the curvature radius of the back side is made larger than that of the front side. CONSTITUTION:A barrel 2 in a deformable area of a bottle 1 made of polyethylene terephthalate has a smaller diameter than a round barrel 5, and a front side 11 of the barrel 2 is shaped in an arc with a curvature radius R1. The center of the curvature radius R1 is concentrically located at the center O1 of the round barrel 5 but the curvature radius R1 is little smaller than the external radius R of the round barrel 5. A back side 12 of the barrel 2 is shaped in an arc with a curvature radius R2 and the distance H from the center O1 of the round barrel 5 to the middle of the back side 12 is smaller than the curvature radius R1 of the front side 11. The curvature radius R2 is at least twice the curvature radius R1 of the front side 11 and the front side 11 an the back side 12 are smoothly connected by a common inscribed circle. Therefore, it looks like a true circle, however, the back side surface 12 collapses at first and the other parts remain unchanged in shape when the container 1 is depressurized inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin bottle container, and more particularly to a sectional shape of its body.

[0002]

2. Description of the Related Art In general, the cross-sectional shape of the body of a resin bottle container is substantially circular. If the contents of this bottle container are filled at high temperature and then stored at room temperature or low temperature, the inside of the container may be depressurized and the body of the bottle container may be partially recessed. It is completely unpredictable which part of the body will be deformed.

By the way, in general, the body portion of a resin bottle container is directly printed with a product name, a design or the like on its front side,
Alternatively, a shrink label on which these are printed is attached. Then, when the product is sold, the consumer displays the bottle container so that the user can see it from the front.

[0004]

However, in the conventional bottle container, when the pressure is reduced, the front side of the body part may be deformed under reduced pressure, which makes it difficult to read the product name, etc., or makes it unattractive. Damages.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to provide a resin bottle container capable of specifying a portion which is deformed when the inside of the container is depressurized.

[0006]

The present invention has the following features to attain the object mentioned above. That is, the resin bottle container of the present invention has a barrel portion having a substantially cylindrical cross section, and at least one region along the axial direction of the barrel portion is a deformable region. The cross-sectional outer shape in the deformable region has a curvature radius on the back side larger than the curvature radius on the front side, and the center of the circle of curvature on the back side is located on the front side of the center of the circle of curvature on the front side. Further, the back side and the front side are connected by a circumscribed circle circumscribing the front side and an inscribed circle common to both the circumscribed circle and the back side.

When the center of the circumscribed circle is located on the front side with respect to the center of the curvature circle on the front side, the back side does not protrude when the bottle container is viewed from the front side, which is preferable in appearance.

When the radius of curvature on the front side is R ₁ , the radius of curvature on the back side is R ₂ , the radius of the circumscribed circle is R ₃ , and the radius of the inscribed circle is R ₄ , these radii are It is preferable to set the size relationship so as to satisfy the following expression, because the appearance is almost the same as a perfect circle, and the appearance is neat. In that case, it is more preferable to the R ₂ more than twice the R _1.

R ₂ > R ₃ > R ₁ > R ₄

If a substantially circular round body having a radius equal to or larger than the radius of curvature on the front side of the deformable area is formed on both sides of the deformable area in the body, a bottle container excellent in line suitability can be obtained. It is possible and preferable.

Polyethylene terephthalate is a typical example of the resin material of these resin bottle containers. However, it is not limited to this resin.

[0012]

In the deformable region of the body, the back side has a larger radius of curvature than the front side, and therefore the strength against pressure reduction inside the container is weaker on the back side than on the front side. Therefore, when the inside of the container is depressurized, the back side is recessed before the front side. That is, the deformed portion of the body portion when the pressure is reduced can be specified on the back side of the deformable region.

[0013]

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 2 is an overall side view of a resin bottle container (hereinafter abbreviated as a bottle container) 1 according to the present invention before deformation, FIG. 3 is an overall rear view of the same, and FIG.
FIG.

The bottle container 1 of this embodiment is made of polyethylene terephthalate, and the mouth cylinder 3 is connected to the upper end of the substantially cylindrical body 2, and the tip of the mouth cylinder 3 is opened as a spout 4.

The upper and lower portions of the body portion 2 are round body portions 5, 6 having a substantially circular cross section, and the space between the round body portions 5, 6 is the round body portion 5, 6.
It is a deformable region A having a diameter smaller than 6. By providing the round barrels 5 and 6 on the upper and lower sides in this way, the bottle container 1 is less likely to fall down even when they are pressed against each other in the standing posture, and the line is excellent in properness.

FIG. 1 shows a cross section in the deformable region A, in which the thickness of the body 2 is omitted and the outer surface is represented by a single solid line. The surface from the front surface B side of the body 2 in the deformable region A to both sides (hereinafter,
This is called the front surface 11) has an arcuate shape with a radius of curvature R ₁ . The center of the circle of curvature of the front surface 11 is located concentrically with the center O ₁ of the round barrels 5, 6, and the radius of curvature R ₁ is slightly smaller than the outer radius R _{5 of the} round barrels 5, 6. It has a small diameter.

On the other hand, the rear surface 12 of the body 2 in the deformable region A has an arc shape having a radius of curvature R ₂ and extends from the center O ₁ of the round bodies 5, 6 to the center of the rear surface 12. The distance to 12a is the radius of curvature R ₁ of the front surface 11
The dimension H is smaller than that (R ₁ > H). The radius of curvature R ₂ of the rear surface 12 is twice or more the radius of curvature R ₁ of the front surface 11 (R ₂ > 2).
R ₁ ), the center O _{2 of the} curvature circle of the rear surface 12 is further eccentric to the front surface B side than the front surface 11.

Further, the front surface 11 and the rear surface 12
Are smoothly connected by a circumscribed circle circumscribing the front surface 11 and an inscribed circle common to the circumscribing circle and the back surface 12. Hereinafter, these connecting portions are referred to as the circumscribed circle portion 13 and the inscribed circle portion 14, respectively.

The radius of curvature R ₃ of the circumscribed circle portion 13 is set to be larger than the radius of curvature R ₁ of the front surface 11 and smaller than the radius of curvature R ₂ of the rear surface 12, and the circumscribed circle portion 13 has a radius of curvature R ₃ . The center O ₃ of the circle of curvature is located closer to the front side B than the center O _{1 of the} circle of curvature of the front surface 11. or,
The radius of curvature R ₄ of the inscribed circle portion 14 is smaller than the radius of curvature R ₁ of the front surface 11.

That is, the radius of curvature R ₁ of the front surface 11
Radius of curvature R ₂ of the rear side surface 12, the radius of curvature R ₃ of the circumscribed circle portion 13, the magnitude relationship between the radius of curvature R ₄ of the inscribed circle portion 14 is as follows.

R ₂ > R ₃ > R ₁ > R ₄

In the bottle container 1 having the above-mentioned structure, the circumscribing circle portion 13 does not protrude when the bottle container 1 is viewed from the front, and the body portion 2 of the deformable region A is apparently seen from any direction. Looks like a perfect circle and looks good.

When the pressure inside the bottle container 1 is reduced,
The rear surface 12 of the body 2 in the deformable region A is first deformed and recessed inward, and the front surface 11 and the circumscribed circle portion 13 do not deform and maintain the shape before decompression.

FIG. 4 is a cross-sectional view of the body portion 2 in the deformable region of the bottle container 1 thus deformed. In this way, the front surface 11 and the circumscribed circle portion 13 are not deformed, and only the back surface 12 is deformed because the radius of curvature R ₂ of the back surface 12 is the radius of curvature R ₁ of the front surface 11 and the circumscribed circle. The radius of curvature R ₃ of the portion 13 is larger than that of the portion 13, so that it cannot be excluded.

When the pressure in the bottle container 1 further decreases and cannot be absorbed only by the deformation of the rear surface 12, the circumscribed circle portion 13 is deformed and dented, and the front surface 11 is not deformed and reduced in pressure. Keep the previous shape. Therefore, even at this time, the bottle container 1 does not appear to be deformed when viewed from the front. The circumscribed circle portion 13 is thus deformed without deforming the front surface 11 because the radius of curvature R ₃ of the circumscribed circle portion 13 is larger than the radius of curvature R ₁ of the front surface 11.

Therefore, in this bottle container 1, when the front surface 11 of the deformable area A in the body portion 2 is directly printed or a shrink label is attached so that the printed portion is located on the front side, the bottle container 1 The front surface 11 is not deformed even if the inside of the container 1 is decompressed, so it looks like it is not deformed when the bottle container 1 is viewed from the front, and the printed characters and patterns are not distorted and look very beautiful. , The product value will not be lost.

In this embodiment, the bottle container 1 having no handle has been described, but the present invention can be applied to the sectional shape of the body of the bottle container having the handle. In that case, since the handle mounting portion generally does not have a cylindrical shape, the cross-sectional shape of the present invention may be adopted for the substantially cylindrical portion excluding the handle mounting portion.

[0028]

As described above, according to the present invention,
When the bottle container is decompressed, only the back side is deformed,
The front side can be prevented from being deformed, the appearance of the bottle container can be improved at the time of display, etc., and the excellent value of the commercial value can be achieved.

[Brief description of drawings]

FIG. 1 is a lateral cross-sectional view of a body portion of a deformable region of a resin bottle container according to the present invention before deformation (II cross-sectional view of FIG. 2).
Is.

FIG. 2 is an overall side view of the bottle container before deformation.

FIG. 3 is an overall rear view of the bottle container before deformation.

FIG. 4 is a cross-sectional view of the body portion of the deformable region after the bottle container is deformed.

[Explanation of symbols]

1 Resin Bottle Container 2 Body 5, 6 Round Body 11 Front Side Surface 12 Back Side Surface 13 Outer Circle Part 14 Inscribed Circle Part A Deformable Area B Front C Back O ₁ Front Side Curvature Center O ₂ Back Side center of curvature O ₃ Center of circumscribed circle R ₁ Curvature radius of front side R ₂ Curvature radius of back side R ₃ Radius of circumscribed circle R ₄ Radius of inscribed circle

Claims (6)

[Claims] 1. A body having a substantially cylindrical cross-section, wherein at least one region along the axial direction of the body is a deformable region, and the radius of curvature on the back side of the cross-sectional outer shape in the deformable region. Is larger than the radius of curvature on the front side, and the center of the circle of curvature on the back side is located on the front side of the center of the circle on the front side, and the back side and the front side are the front side. A resin bottle container, which is connected by a circumscribing circle circumscribing to and a common inscribed circle common to both the circumscribing circle and the back side. 2. The resin bottle container according to claim 1, wherein the center of the circumscribed circle is located on the front side with respect to the center of the curvature circle on the front side. 3. When the radius of curvature on the front side is R ₁ , the radius of curvature on the back side is R ₂ , the radius of the circumscribed circle is R ₃ , and the radius of the inscribed circle is R ₄ , these radii The resin bottle container according to claim 1 or 2, wherein the magnitude relation of is set to satisfy the following equation. R ₂ ＞ R ₃ ＞ R ₁ ＞ R ₄ 4. The resin bottle container according to claim 3, wherein the radius of curvature R ₂ on the back side is twice or more the radius of curvature R ₁ on the front side. 5. A substantially circular round body having a radius equal to or larger than a radius of curvature on the front side of the deformable area is formed on both sides of the deformable area in the body section. Item 5. The resin bottle container according to any one of items 1 to 4. 6. The resin bottle container according to claim 1, wherein the resin material is polyethylene terephthalate.