JP7432163B2 - PET bottles - Google Patents

Description

The present invention relates to a PET bottle for heating, and more particularly to a PET bottle that has an excellent design and whose bottom center part does not fall down.

BACKGROUND ART Conventionally, heating PET bottles that are placed on a ground surface are known to have a mouth, a body, a shoulder, and a bottom. Such heating plastic bottles are heated by heating vending machines, etc., and the internal pressure increases, but in order to absorb the internal pressure caused by heating, the body is equipped with multiple flat pressure absorption panels. .

However, in PET bottles having pressure-absorbing panels, the contents are difficult to see from the outside due to the pressure-absorbing panels.

Another problem is that the pressure-absorbing panel makes it difficult to attach a label to the outer surface of the body of the PET bottle.

In such cases, one option is to remove the flat pressure-absorbing panel from the body of the PET bottle, but if the pressure-absorbing panel is removed, the internal pressure will rise during heating, causing the center of the bottom to drop. be.

Japanese Patent Application Publication No. 2010-228816

The present invention has been made in consideration of these points, and is a heating device in which the pressure absorption panel can be removed from the body, and the center part of the bottom part does not drop even if the internal pressure increases during heating. The purpose is to provide plastic bottles.

The present invention provides a cylindrical PET bottle for heating placed on a ground surface, including a mouth, a body connected to the mouth through a shoulder, and a bottom connected to the body. The body has no pressure absorption panel and has a flat surface with no unevenness as a whole, and the bottom part has a circumferential grounding part that is in contact with the grounding surface. , a bottom center portion provided at the center of the circumferential grounding portion and protruding upward; and a circumferential boundary portion forming a boundary between the circumferential grounding portion and the body portion; The boundary part is a plastic bottle that is inclined in the range of 0 to 30 degrees with respect to the ground plane.

The present invention is a PET bottle, in which a circumferential label guard is provided in the center portion of the body excluding the upper and lower portions, and is recessed inward from the other portions of the body.

The present invention is a PET bottle, wherein the height of the center portion of the bottom from the ground surface is 10 to 30 mm.

As described above, according to the present invention, the body of the PET bottle does not have a pressure absorption panel and has a flat shape as a whole, so that the contents can be easily exposed to the outside, and The internal pressure of the bottle can be absorbed effectively by the circumferential border.

FIG. 1 is a side view showing a plastic bottle according to a first embodiment. FIG. 2A is a diagram showing a PET bottle according to the present invention. FIG. 2B is a diagram showing a plastic bottle according to the present invention. FIG. 2C is a diagram showing a PET bottle as a comparative example. FIG. 3 is a diagram showing a PET bottle placed on a hot plate in an example. FIG. 4 is a side view of the exterior of the PET bottle according to the first embodiment. FIG. 5 is a perspective view showing a plastic bottle according to the first embodiment. FIG. 6 is a bottom view showing the PET bottle according to the first embodiment. FIG. 7 is a side view showing a plastic bottle according to the second embodiment.

<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

Here, FIGS. 1 to 6 are diagrams showing a first embodiment of the present invention.

First, the outline of the heating PET bottle will be described with reference to FIGS. 4 to 6. As shown in FIGS. 4 to 6, a heating PET bottle (hereinafter also simply referred to as a PET bottle) 10 is made of two test tube-shaped preforms made of polyethylene terephthalate (PET) manufactured by injection molding or the like. Consists of a bottle manufactured by axial stretch blow molding. Such a PET bottle 10 is placed on a ground surface 30 (see FIG. 1) consisting of a heating surface of a heating vending machine or the like, and is heated by the heating surface of this heating vending machine or the like.

Such a PET bottle 10 has a cylindrical shape as a whole, and includes a mouth part 12 having an external thread 12a and a support ring 12b, a body part 11 connected to the mouth part 12 via a shoulder part 13, and a body part 11 connected to the mouth part 12 via a shoulder part 13. The bottom part 20 is connected to the lower part of the bottom part 20, and is made of PET (polyethylene terephthalate) as a whole.

Here, the body portion 11 has a flat shape as a whole without having a pressure absorbing panel formed in a flat shape.

In the present specification, "upper" and "lower" mean "upper" and "lower" when the PET bottle 10 is erected in the state shown in FIG. 4 (see FIG. 4). Furthermore, the term "flat" refers to a shape with a smooth surface and no unevenness, and includes both flat and curved surfaces.

The bottom portion 20 also includes a circumferential grounding portion 21 that is in contact with the grounding surface 30, a bottom center portion 22 that is provided at the center of the circumferential grounding portion 21 and protrudes upward, and the circumferential grounding portion 21 and the body portion 11. It has a circumferential boundary portion 23 forming a boundary between the two.

Further, the bottom central portion 22 is provided with five protruding portions 25 projecting outward at its lower portion, and each protruding portion 25 extends upward from the circumferential boundary portion 23 toward the upper end portion 22a. . These five protrusions 25 serve to strengthen the bottom center portion 22 of the bottom portion 20.

The total length H of the PET bottle shown in FIG. 1 is 120 to 210 mm, and the height H1 from the ground plane 30 to the upper end of the bottom center portion 22 is 10 to 30 mm. Further, the diameter D of the body portion 11 is 52 to 75 mm.

Next, the structure of the bottom portion 20 will be further described with reference to FIG.

As shown in FIG. 1, the circumferential grounding part 21 of the bottom part 20 is grounded on the grounding surface 30, and the circumferential boundary part 23 formed between the circumferential grounding part 21 and the body part 11 is , is inclined at an inclination angle θ with respect to the ground plane 30.

The inclination angle θ of the circumferential boundary portion 23 is 0° to 30°, preferably 3° to 20°.

The plastic bottle 10 is placed on a heating surface such as a heating vending machine that constitutes the ground surface 30 and is heated together with the contents such as water. When the plastic bottle 10 is heated, the internal pressure increases. Since the body 11 of the PET bottle 10 does not have a pressure absorption panel, when the internal pressure of the PET bottle 10 increases, the increased internal pressure is applied to the bottom 20 side.

In this case, the circumferential boundary part 23 of the bottom part 20 is arranged downwardly outwardly with respect to the body part 11 via the circumferential bent part P between the body part 11 and the circumferential boundary part 23 (Fig. It bends and deforms in the direction of arrow L in 1). By bending and deforming the circumferential boundary portion 23 downward and outward in this manner, the internal volume of the PET bottle 10 increases, and the internal pressure within the PET bottle 10 can be absorbed.

By the way, when the inclination angle θ of the circumferential boundary portion 23 is small, for example, when the inclination angle θ is around 0°, the force acting downward from the inside of the PET bottle 10 on the circumferential boundary portion 23 becomes large. , the circumferential boundary portion 23 is easily bent and deformed downward and outward via the circumferential bent portion P.

On the other hand, when the inclination angle θ of the circumferential boundary portion 23 is large, for example, when θ exceeds 30°, the force acting downward from the inside of the PET bottle 10 on the circumferential boundary portion 23 becomes small, It becomes difficult to deform the circumferential boundary portion 23 downward and outward. When the circumferential boundary portion 23 does not deform downward and outward, the internal pressure within the PET bottle 10 is directed toward the bottom center portion 22, and the bottom center portion 22 is pressed downward, causing the bottom center portion 22 to move downward. It protrudes toward the ground, and in some cases reaches the ground plane 30. When the bottom central portion 22 contacts the ground plane 30 in this way, a phenomenon (buckling) occurs in which the PET bottle 10 becomes unstable on the ground plane 30.

From the above, as described above, the inclination angle of the circumferential boundary portion 23 of the bottom portion 20 is set to 0° to 30°.

Next, the operation of this embodiment having such a configuration will be described.

First, the above-mentioned plastic bottle 10 is prepared, the contents (water) are put into the plastic bottle 10, and the cap 15 (see FIG. 3) is attached to the mouth part 12.

Next, the PET bottle 10 containing the contents is placed on a heating surface (ground surface) 30 of a heating vending machine or the like, and the PET bottle 10 is heated by the heating surface. At this time, the circumferential boundary portion 23 of the bottom portion 20 is bent and deformed downward and outward (in the direction of arrow L) via the circumferential bent portion P. As a result, the internal volume within the PET bottle 10 increases, and an increase in the internal pressure within the PET bottle 10 can be effectively absorbed by the circumferential boundary portion 23.

In addition, since the body 11 of the PET bottle 10 does not have a pressure absorption panel and has a flat shape as a whole, the contents can be easily exposed to the outside, and the PET bottle 10 has an excellent design. Can be provided. Further, a label can be easily attached to the body 11 of the PET bottle 10.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment shown in FIG. 7 has a body 11 that is recessed inward from other parts of the body 11 in the center part of the body 11 of the PET bottle 10, excluding the upper part 17a and the lower part 17b. A circumferential label guard 17 is provided to protect the label (not shown) to be pasted.

The other configurations shown in FIG. 7 are substantially the same as those of the first embodiment shown in FIGS. 1, 4 to 6.

In the second embodiment shown in FIG. 7, the same parts as those in the first embodiment shown in FIGS. 1, 4 to 6 are given the same reference numerals, and detailed description thereof will be omitted.

In FIG. 7, by providing a circumferential label guard 17 in the center of the body 11 that is recessed inward from other parts, it is possible to attach a label to the body 11 on the circumferential label guard 17. can. Further, the label guard 17, which is recessed inward from other parts, can also prevent scratches on the label surface.

Also in FIG. 7, when the PET bottle 10 is heated, the circumferential boundary portion 23 of the bottom portion 20 is bent downward and outward (in the direction of the arrow L) via the circumferential bent portion P and deformed. do. As a result, the internal volume within the PET bottle 10 increases, and an increase in the internal pressure within the PET bottle 10 can be effectively absorbed by the circumferential boundary portion 23.

Furthermore, since the body 11 of the PET bottle 10 does not have a pressure absorption panel and is flat as a whole, the contents can be easily exposed to the outside, and the PET bottle 10 has an excellent design. Can be provided. Further, a label can be easily attached to the body 11 of the PET bottle 10.

Next, specific embodiments of the present invention will be described with reference to FIGS. 2A, 2B, 2C, and 3. This example corresponds to the first embodiment described above.

First, the PET bottle 10 described in the first embodiment was produced by biaxial stretch blow molding using a 22 g PET preform. The total length H of this PET bottle 10 is 132 mm, and the diameter D of the body 11 is 66 mm.

Next, water was filled into the plastic bottle 10 to a position 25 mm below the upper end of the mouth part 12, and the cap 15 was attached to the mouth part 12.

Next, as shown in FIG. 3, the PET bottle 10 filled with water was placed on the heating surface 30 of a hot plate (EC-1200N) manufactured by As One Co., Ltd. as a severe test during heated sales.

The hot plate was activated to heat the heating surface 30 of the hot plate until the set temperature was 180°C.

In this case, the PET bottle 10 according to the present invention is a PET bottle 10 in which the inclination angle θ of the circumferential boundary portion 23 of the bottom portion 20 is 0° (see FIG. 2A), and the inclination angle θ of the circumferential boundary portion 23 of the bottom portion 20. A PET bottle 10 (see FIG. 2B) with θ of 30° was prepared.

At the same time, a PET bottle 10 (see FIG. 2C) in which the inclination angle θ of the circumferential boundary portion 23 of the bottom portion 20 was 60° was prepared as a PET bottle 10 according to a comparative example.

At this time, the PET bottle 10 was placed on the heating surface 30 to check whether a buckling phenomenon occurred in which the bottom central portion 22 of the bottom 20 of the PET bottle 10 protruded downward and came into contact with the heating surface 30. Evaluation was made along with the elapsed time.

The evaluation results are shown in Table 1.

表１において、バックリング現象が生じていない状態を「○」として示し、バックリング現象が生じた状態を「×」として示す。

In Table 1, the state where the buckling phenomenon did not occur is shown as "○", and the state where the buckling phenomenon occurred is shown as "x".

As can be seen from Table 1, when the inclination angle θ of the circumferential boundary portion 23 of the bottom portion 20 is 0 to 30°, it takes a longer time to cause the buckling phenomenon than when the inclination angle θ is 60°. It was found that when the inclination angle θ was 0 to 30°, the bottom portion 20 was able to effectively absorb the increase in internal pressure without being deformed.

10 Plastic bottle 11 Body 12 Mouth 13 Shoulder 17 Circumferential label guard 20 Bottom 21 Circumferential grounding portion 22 Bottom center portion 23 Circumferential boundary portion 30 Grounding surface

Claims (2)

In a cylindrical PET bottle for heating placed on a ground surface,
mouth and
a torso connected to the mouth via a shoulder;
a bottom portion connected to the body portion;
The body has no pressure absorption panel and has a flat surface with a smooth surface and no unevenness,
The bottom portion includes a circumferential grounding portion that is in contact with the grounding surface, a bottom central portion that is provided at the center of the circumferential grounding portion and protrudes upward, and has an upper end portion, the circumferential grounding portion and the bottom portion. It has a circumferential boundary portion that forms a boundary with the torso,
The circumferential boundary part is inclined in a range of 0 to 30 degrees with respect to the ground plane,
The bottom center portion includes a plurality of protrusions protruding outward provided along a circumferential direction between the circumferential grounding portion and the upper end portion, and a plurality of protrusions extending circumferentially between the protrusions. a recessed portion formed by the recessed portion, the protruding portion having a cross-sectional shape projecting outward, and the recessed portion having a flat cross-sectional shape;
The protruding portion extends from the circumferential grounding portion toward the upper end to strengthen the bottom center, and the total length H of the PET bottle is 120 to 210 mm, and the bottom center The height H1 of the upper end portion from the ground plane is 10 to 30 mm ,
The upper end portion constitutes an upper end located at the center of the bottom central portion, and the cross-sectional shape of the protrusion in a cross section extending in the vertical direction extends downward from the upper end portion, protrudes outward, and forms an upper end located at the center of the bottom central portion. Strengthen plastic bottles. 2. The PET bottle according to claim 1 , wherein a circumferential label guard is provided in a central portion of the body excluding the upper and lower portions thereof and is recessed inward from the other portions of the body.

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