JP7079611B2 - Synthetic resin bottle - Google Patents

Description

The present invention relates to a synthetic resin bottle.

Conventionally, as a synthetic resin bottle for containing a liquid content such as a beverage or a liquid seasoning, a bottle made of a synthetic resin such as polyethylene terephthalate resin has been used.

In the synthetic resin bottle, when filling the liquid content, for example, the liquid content heated to a high temperature of about 85 ° C. for sterilization is filled, and a cap is attached to the mouth to fill the inside. After sealing, so-called hot packing is performed to cool the product. In the hot pack, if the internal pressure of the synthetic resin bottle (hereinafter, abbreviated as the internal pressure of the bottle) becomes reduced due to cooling, the body of the synthetic resin bottle may be deformed into an unexpected shape. ..

Therefore, in order to prevent unauthorized deformation of the body of the synthetic resin bottle due to cooling of the liquid content, swelling deformation and immersive deformation are performed on the body in response to the volume change inside the synthetic resin bottle. A synthetic resin bottle having a panel portion that allows the above is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-137927

On the other hand, in the case of so-called aseptic filling in which the liquid content close to room temperature is filled in the synthetic resin bottle in a sterile environment, the bottle internal pressure does not change much with cooling, so that the body portion is provided with a panel portion. I don't need that.

Therefore, when the synthetic resin bottle having the panel portion on the body portion is used for aseptic filling, it may not be preferred in terms of design. Further, since the synthetic resin bottle having the panel portion on the body portion has unevenness on the body portion, there is a problem that the shape of the mold used for manufacturing the bottle becomes complicated.

Therefore, in view of the above circumstances, the present invention can prevent unauthorized deformation after hot-packing without providing a panel portion on the body portion, and can be used for both hot-packing and aseptic filling. It is intended to provide resin bottles.

In order to achieve such an object, the synthetic resin bottle of the present invention has a cylindrical mouth portion, a shoulder portion whose diameter is continuously and gradually expanded downward from the lower end portion of the mouth portion, and a shoulder portion downward from the lower end portion of the shoulder portion. In a synthetic resin bottle having a continuous body portion and a bottom portion that closes the lower end of the body portion and the inside of which is sealed by a cap attached to the mouth portion, the body portion is rotated through a corner portion. It is a polygonal cylinder having a plurality of flat wall portions connected in a direction, and the corner portion is composed of a surface connecting the peripheral edges of the flat wall portions adjacent to each other, and the corner portion is provided with a fan-shaped portion. A pair that has a shape that narrows from the body to the bottom when viewed from the side, and the distance between the two is gradually reduced from the body to the bottom along the contour of the flat wall on each flat wall of the body. It is characterized by having a vertical rib.

The synthetic resin bottle of the present invention is provided with vertical ribs along the contour of the flat wall portion of the body portion, and as a result, the vertical ribs are arranged on both sides of the corner portion. Therefore, after hot-packing the liquid content, when the inside of the synthetic resin bottle is reduced in pressure as the liquid content is cooled, the central portion of the flat wall portion is recessed inside the synthetic resin bottle. On the other hand, the central portion of the corner portion in the height direction is deformed so as to protrude outward from the synthetic resin bottle.

The synthetic resin bottle of the present invention can absorb the reduced pressure after the hot pack due to the deformation of the flat wall portion and the corner portion to prevent the body portion from being deformed illegally. Therefore, according to the synthetic resin bottle of the present invention, it is possible to cope with the hot pack without providing the panel portion on the flat wall portion.

Further, since the synthetic resin bottle of the present invention includes a plurality of flat wall portions in which the body portion is connected in the circumferential direction via the corner portion, the bottle has a design that can be used for aseptic filling.

The body of the synthetic resin bottle of the present invention may have a pentagonal or larger polygonal cylinder, but may be, for example, a square cylinder.

A is a front view showing the configuration of the synthetic resin bottle of the present invention, and B is a bottom view of A. A side view showing a state in which the synthetic resin bottle shown in FIG. 1A is rotated by 45 ° in the horizontal direction. FIG. 1A is a sectional view taken along line III-III. The graph which shows the relationship between the pressure inside a bottle and the amount of dents in the central part of a flat wall part at the time of hot-packing a liquid content in a synthetic resin bottle shown in FIG. 1A and cooling. The graph which shows the relationship between the bottle internal pressure at the time of hot-packing a liquid content in the synthetic resin bottle shown in FIG. 1A and cooling, and the protrusion amount of the central portion in the height direction of a corner portion. The graph which shows the relationship between the bottle internal pressure and the bottle internal volume when the liquid content was hot-packed and cooled in the synthetic resin bottle shown in FIG. 1A.

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 1A, the synthetic resin bottle 1 of the present embodiment has a cylindrical mouth portion 2, a shoulder portion 3 whose diameter is continuously and gradually increased downward from the lower end of the mouth portion 2, and a shoulder portion 3. A body portion 4 continuous downward from the lower end portion and a bottom portion 5 for closing the lower end portion of the body portion 4 are provided. The mouth portion 2 is provided with a male screw portion 6 and a support ring 7 on the outer peripheral surface, and the inside is sealed by a cap (not shown) screwed to the male screw portion 6.

The body portion 4 is a square cylinder having four flat wall portions 9 connected in the circumferential direction via the corner portion 8, and the corner portion 8 connects the peripheral edges of the flat wall portions 9 adjacent to each other in the circumferential direction. It is composed of faces. Each flat wall portion 9 is provided with a pair of vertical ribs 10 along the contour thereof, and is not provided with irregularities such as a panel portion.

As shown in FIG. 1B, the bottom portion 5 includes an annular ground contact portion 11 and a recess 12 that bulges into the synthetic resin bottle 1 on the inner peripheral side of the ground contact portion 11, and as a result, is made of synthetic resin. The bottle 1 can stand on its own at the ground contact portion 11. The corner portion 8 includes a fan-shaped portion 8a that spreads in a fan shape from the body portion 4 side toward the bottom portion 5, and the fan-shaped portion 8a is connected to the annular ground contact portion 11.

The body 4 of the synthetic resin bottle 1 has a square shape as shown in FIG. 1A in the front view, but the corner portion 8 is provided with the fan-shaped portion 8a, so that the side view is rotated by 45 ° from the state shown in FIG. 1A. Then, as shown in FIG. 2, it has a shape that narrows from the body 4 to the bottom 5. As the body portion 4 has the above-mentioned shape, the distance between the pair of vertical ribs 10 gradually decreases from the body portion 4 to the bottom portion 5.

Further, since the pair of vertical ribs 10 are formed along the contour of the flat wall portion 9, as shown in FIG. 3, as a result, the vertical ribs 10 of one flat wall portion 9 are adjacent to the flat wall portion. The corner portion 8 is sandwiched between the vertical rib 10 and the vertical rib 10.

Next, as an example, a liquid content heated to 90 ° C. in a synthetic resin bottle 1 of the present embodiment having a capacity of 250 ml, a height of 140 mm, a length of 54 mm between opposite sides of the body 4 and a length of 64 mm between diagonals. The synthetic resin bottle 1 is filled with warm water as an object, a cap (not shown) is screwed onto the male screw portion 6 of the mouth portion 2, the inside of the synthetic resin bottle 1 is sealed, and then cooled to 5 ° C. The internal pressure of the bottle, the amount of the flat wall portion 9 recessed into the synthetic resin bottle 1, the amount of the corner portion 8 protruding outward from the synthetic resin bottle 1, and the internal volume of the synthetic resin bottle 1. I investigated the relationship. Further, as a comparative example, the synthetic resin bottle 1 having the same shape as the synthetic resin bottle 1 of the present embodiment is used except that the vertical rib 10 is not provided at all. The internal pressure of the bottle, the amount of the flat wall portion 9 recessed into the synthetic resin bottle 1, the amount of the corner portion 8 protruding outward from the synthetic resin bottle 1, and the internal volume of the synthetic resin bottle 1. I investigated the relationship between.

The "amount of dent in the synthetic resin bottle 1 of the flat wall portion 9" means that the flat wall portion 9 gradually dents inward as the depressurization inside the synthetic resin bottle 1 progresses, and the synthetic resin is used. It refers to the amount of change in the portion that becomes the apex of the convex shape when the bottle 1 becomes convex inward. Further, the "amount of protrusion of the corner portion 8 to the outside of the synthetic resin bottle 1" means that the corner portion 8 is pushed outward as the depressurization inside the synthetic resin bottle 1 progresses, and the outside of the synthetic resin bottle 1 The amount of change in the part that became the apex of the convex shape when it became convex toward the direction.

FIG. 4 shows the relationship between the internal pressure of the bottle and the amount of depression of the central portion of the flat wall portion 9 into the inside of the synthetic resin bottle, and the internal pressure of the bottle and the central portion of the corner portion 8 in the height direction of the synthetic resin bottle. FIG. 5 shows the relationship with the amount of protrusion to the outside, and FIG. 6 shows the relationship between the internal pressure of the bottle and the internal volume of the synthetic resin bottle. In FIGS. 4 to 6, the change to the inside of the synthetic resin bottle is shown as a plus, and the change to the outside of the synthetic resin bottle is shown as a minus.

From FIGS. 4 to 6, according to the synthetic resin bottle 1 of the present embodiment, the amount of recession into the inside of the synthetic resin bottle 1 in the central portion of the flat wall portion 9 with respect to the synthetic resin bottle of the comparative example. The amount of protrusion of the synthetic resin bottle 1 outward in the central portion of the corner portion 8 in the height direction is large, and as a result, the internal volume of the synthetic resin bottle is greatly reduced, which accompanies cooling after hot packing. It is clear that the reduced pressure inside the bottle can be easily absorbed.

In the synthetic resin bottle 1 of the present embodiment, as shown in FIG. 3, the corner portion 8 has a shape with a cross-sectional view R, but the corner portion 8 has a shape in which each apex angle of the cross-sectional view quadrangle is chamfered. May be. Further, the flat wall portion 9 may be curved outward as long as it does not impair the rectangular shape in cross-sectional view.

1 ... Synthetic resin bottle, 2 ... Mouth, 3 ... Shoulder, 4 ... Body, 5 ... Bottom, 8 ... Corner, 9 ... Flat wall, 10 ... Vertical ribs.

Claims (2)

A cylindrical mouth, a shoulder that gradually expands downward from the lower end of the mouth, a body that continues downward from the lower end of the shoulder, and a bottom that closes the lower end of the body. In a synthetic resin bottle, the inside of which is sealed by a cap attached to the mouth.
The body portion is a polygonal cylinder having a plurality of flat wall portions connected in the circumferential direction via a corner portion, and the corner portion is composed of a surface connecting the peripheral edges of the flat wall portions adjacent to each other. A fan-shaped portion is provided at the corner portion, and the shape is narrowed from the trunk portion to the bottom portion in a side view, and each flat wall portion of the trunk portion is formed from the trunk portion along the contour of the flat wall portion. A synthetic resin bottle characterized by having a pair of vertical ribs that gradually reduce the distance between the two toward the bottom . The synthetic resin bottle according to claim 1, wherein the body portion is in the shape of a square cylinder.

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