JPH07137725A - Resin-made bottle - Google Patents

Abstract

PURPOSE:To confine a deformable area of a resin-made container to a specified area where deformation occurs when the container is depressurized inside, by a method wherein the container has a barrel with a cross section of nearly a cylindrical shape, the curvature radius of the back side of the horizontal cross section is larger than that of the front side, and the center of the curvature radius of the back side if located closer to the front side than the center of the curvature radius of the front side is located. CONSTITUTION:A surface 11 from a front side B of a barrel in a deformable area to the both ends is shaped into an arc with a curvature radius R1 over one edge to the other. The center of the curvature R1 is concentrically located at the center O1 of a round barrel 8 and the curvature radius R1 is a little smaller than the external radius of the round barrel 8. A back side surface 12 has an arc-shape with a radius R2 and its middle part 12a comes close to the front side by a distance equivalent to the depth of a reinforcing groove 5 so that the back side surface 12 is level with the bottom of the reinforcing groove 5. The curvature radius R2 is satisfactorily larger than the curvature radius R1 of the front side surface 11, and the center O2 of the curvature radius R2 is located closer to the front side B than the center O1 of the curvature radius R1 of the front side surface 11 is located. The back side of the barrel 2 collapses when the container 1 is depressurized inside, but the front side remains unchanged in shape and maintains the arc-shape.

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 first resin bottle container of the present invention has a body having a substantially cylindrical cross section, and at least one region along the axial direction of the body is made a deformable region. The cross-sectional outer shape of the deformable region is such that the radius of curvature on the back side 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 of curvature on the front side. There is. The back side may be a flat surface, which can be considered as a case where the radius of curvature on the back side is infinite.

If the rear surface side and the front surface side in the deformable region are connected by an inscribed circle common to both, smoothness and good appearance are obtained. In this resin bottle container,
Reinforcing rib grooves may be provided in portions of the body located on both sides of the deformable region. In that case, it is preferable to make the central portion of the rear surface in the deformable region substantially flush with the bottom surface of the reinforcing rib groove because the appearance can be made clean before and after the deformation.

Further, the second resin bottle container of the present invention is
The rear surface side of the cross-sectional outer shape in the deformable region is formed in a concave shape. It is preferable that the radius of curvature of the concave curved back side is larger than the radius of curvature of the deformable region on the front side.

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

[0010]

In the deformable region of the body, the back side has a larger radius of curvature than the front side, or is formed in a concave curve, so that the strength of the inside of the container against the reduced pressure is higher in the back side than in the front side. become weak.

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.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings of FIGS. 3 is an overall side view of a resin bottle container (hereinafter abbreviated as a bottle container) 1 according to the present invention before being deformed, FIG. 4 is an overall rear view of the same, and FIG.
FIG. 2 is a sectional view taken along the line II-II of FIG.

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

Reinforcing rib grooves 5 and 6 are formed in a C shape in the upper and lower portions of the body portion 2 except for the rear surface side, and the upper portion of the reinforcing rib groove 5 is a semicircle whose front half is substantially semicircular. The body 7 is formed, and the lower portion of the reinforcing rib groove 6 is a round body 8 having a substantially circular cross section. The radius of curvature of the front surface of the semi-round body portion 7 and the outer radius of the round body portion 8 have the same dimension R ₄ .

On the back side of the reinforcing rib groove 5, a handle mounting recess 9 is formed.
The handle portion 10 formed separately from the body portion 2 is fitted and fixed in the mounting recess 9. The handle portion 10 is dimensioned so as not to project from the round barrel portion 8 when viewed from above. Therefore, even when the bottle containers 1 that have been erected stand up against each other, they do not easily fall over, and the line is excellent in properness.

In the body 2, a region from the upper part of the reinforcing rib groove 6 to the lower part of the mounting recess 9 is a deformable region A. 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.

In the deformable area A, the surface 11 from the front B side to both sides of the body 2 (hereinafter referred to as the front surface) 11 has an arc shape having a radius of curvature R ₁ . The center of the circle of curvature of the front surface 11 is the round body 8
Is located concentrically with the center O ₁ of the core body, and the radius of curvature R ₁ is slightly smaller than the outer radius R ₄ of the round barrel portion 8.

On the other hand, the rear surface 12 of the body 2 in the deformable area A has an arc shape having a radius of curvature R ₂ . The rear surface 12 is located closer to the front surface B side in the central portion 12a by the depth dimension of the reinforcing rib groove 5, and is flush with the bottom surface of the reinforcing rib groove 5. The radius of curvature R ₂ of the rear surface 12 is equal to the front surface 1
The radius of curvature R ₁ is sufficiently larger than the radius of curvature R _{1 of 1} , and the center O ₂ of the circle of curvature of the rear surface 12 is eccentric from the center O _{1 of the} circle of curvature of the front surface 11 to the front B side.

Further, the front surface 11 and the back surface 12
Are smoothly connected by an inscribed circle common to both surfaces. The radius R ₃ of this inscribed circle is sufficiently smaller than the radius of curvature R ₁ of the front surface 11.

In the case of the bottle container 1 having the above structure, when the inside of the container is depressurized, the rear surface 12 of the body 2 in the deformable region A is deformed and recessed inward, but the front surface 11 is It does not deform and maintains an arc shape with a radius of curvature R ₁ .

FIG. 5 is a side view of an essential part of the bottle container 1 thus deformed, and FIG. 6 is a sectional view taken along line III-III of FIG. Thus, the front surface 11 is not deformed, and only the back surface 12 is deformed because the radius of curvature R of the back surface 12 is R.
_{Since 2} is larger than the radius of curvature R ₁ of the front surface 11, it is not excluded.

The Applicant has found that the radius of curvature R of the front surface 11 is
₁ is 60.4 mm, the radius of curvature R ₂ of the rear surface 12 is 90 m
m, the radius R ₃ of the inscribed circle connecting these is 30 mm, the outer radius R ₄ of the round body 2 is 61.4 mm, the total height of the bottle container 1 is 355 mm, and the axial length of the deformable region A is about 15
A bottle container 1 having a thickness of 0 mm was prototyped and subjected to a vacuum test. As a result, the rear surface 12 was deformed and the front surface 1
It was confirmed that no deformation was observed in No. 1.

Therefore, in this bottle container 1, if printing is performed directly on the front side of the deformable area A in the body 2, or if a shrink label is attached so that the printed portion is located on the front side, the inside of the bottle container 1 Since the front surface 11 is not deformed even when the pressure is reduced, 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 value will not be lost.

Although the bottle container 1 having the handle portion 10 has been described in this embodiment, it can be applied to the cross-sectional shape of the body portion of the bottle container having no handle portion 10. Almost the entire length can be the deformable region.

FIG. 7 is an end view showing another embodiment of the cross-sectional shape of the body 2 in the deformable region A of the bottle container. In the embodiment of FIG. 7, the rear surface 12 is a flat surface, and in this case, it can be considered that the radius of curvature R ₁ of the rear surface 12 is infinite.

FIG. 8 is an end view showing the cross-sectional shape of the body 2 in the deformable region A of the bottle container 1 according to the second invention. In this bottle container 1, the rear surface 12 of the body portion 2 in the deformable region A has a concave curved shape that is recessed inward, and the curvature radius R ₅ of the rear surface 12 is sufficiently larger than the curvature radius R ₁ of the front surface 11. It is a large one. Since the other structure is the same as that of the first invention, the description thereof will be omitted.

Also in the cases of these FIGS. 7 and 8, it is possible to prevent the rear surface 12 from deforming and the front surface 11 to not deform when the pressure inside the bottle container 1 is reduced.

[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 (cross-sectional view taken along line I-I of FIG. 3) of a deformable region of a resin bottle container according to a first invention before being deformed.

FIG. 2 is a plan view of the bottle container (FIG. 3II-II arrow view).
Is.

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

FIG. 4 is an overall rear view of the bottle container before deformation.

FIG. 5 is a side view of an essential part after the bottle container is deformed.

FIG. 6 is a lateral cross-sectional view (cross-sectional view taken along the line III-III in FIG. 5) of the body part of the deformable region after the deformation of the bottle container.

FIG. 7 shows another embodiment of the bottle container, and is an end view of a cross section of a body portion of a deformable region before deformation.

FIG. 8 is an end view of a cross section of a body portion of a deformable region before deformation of the resin bottle container according to the second invention.

[Explanation of symbols] 1 resin bottle container 2 body 5 reinforcing rib groove 6 reinforcing rib groove A deformable area B front C back O ₁ center of curvature circle on front side O ₂ center of curvature circle on back side R ₁ front side Radius of curvature R ₂ Radius of curvature on the back side

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 of curvature on the front side. 2. The resin bottle container according to claim 1, wherein the rear surface side and the front surface side in the deformable region are connected by an inscribed circle common to both of them. 3. A reinforcing rib groove is provided on both sides of the deformable region in the body portion, and a central portion of a rear surface side in the deformable region is substantially flush with a bottom surface of the reinforcing rib groove. Claim 1 or 2 characterized in that
The resin bottle container described in. 4. A resin bottle container having 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 rear surface of the cross-sectional outer shape in the deformable region. A resin bottle container having a concavely curved side. 5. The resin bottle container according to claim 4, wherein the curvature radius of the concave curved back surface side is larger than the curvature radius of the deformable region on the front surface side. 6. The resin bottle container according to claim 1, wherein the resin material is polyethylene terephthalate.