JPH08230854A - Plastic bottle - Google Patents

Abstract

PURPOSE: To provide plastic bottles which can absorbs the evacuated pressure in the bottle inside without decrease of the rigidity and retain more the shape at the lower part thereof. CONSTITUTION: Shallow recesses 10 are formed at the peripheral wall 7 of the body and deep recesses 9 having different planes are formed in the shallow recesses 10 so that the lower peripheral edge thereof extends to the lower outside of the shallow recesses and connects to the peripheral wall 7 of the body and further, the boundaries of both recesses are partitioned by ribs 11. The deformation of the bottle due to the increased or decreased inside pressure is absorbed by both recesses. The varied parts of the faces of both shallow recesses 10 and the deep recesses 9 and the ribs 11 retains the rigidity of bottle and the buckling strength of the lower peripheral wall 7 of the bottle increases in particular.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic bottle having a peripheral wall having a recess for absorbing deformation caused by pressure change in a container, especially pressure reduction.

[0002]

2. Description of the Related Art When a plastic bottle is filled with a high-temperature liquid and hermetically sealed, if the internal pressure of the bottle decreases as the contents cool, the peripheral wall is dented or bent up and down, so-called decompression deformation. This may cause trouble in handling the plastic bottle or may significantly reduce the commercial value. Therefore, for example, as shown in FIG. 7, the recess 2 is formed around the body portion 20 of the plastic bottle.
1 is provided so that when a reduced pressure is generated, this portion is deformed inward of the bottle so that the reduced pressure is absorbed.

[0003]

In the conventional plastic bottle, although the reduced pressure can be absorbed properly,
Since the concave portion 21 is easily bent, the rigidity of the bottle is low. Especially, when the reduced pressure is absorbed, the concave portion is dented inwardly of the bottle, so that the buckling (bending) strength of the bottle is remarkably reduced, and the bottle is hindered from bending up and down. There was a problem that it was easy to come.

Further, since the concave portion 21 is easily bent, there is a problem that the lower portion of the concave portion 21 is likely to project outward immediately after the high temperature liquid is filled or when a load is applied to the bottle from above.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a shape retainer capable of absorbing the reduced pressure inside the bottle without lowering the rigidity of the bottle. It is an object of the present invention to provide a plastic bottle having excellent properties and also to provide a plastic bottle capable of further improving the shape retention of the lower portion of the bottle.

[0006]

In order to solve the above-mentioned problems, the plastic bottle of the present invention is a plastic bottle having a recess for absorbing reduced pressure deformation on the peripheral wall of the body, wherein the peripheral part of the recess is a shallow recess. The feature is that deep recesses having different surfaces are formed in the shallow recesses. The boundary between the shallow concave portion and the deep concave portion is preferably partitioned by ribs.

Further, according to the present invention, in the above-mentioned structure, the lower part of the deep recess reaches the lower outer side of the shallow recess, and the peripheral edge of the extended deep recess is continuous with the peripheral wall of the bottle. It is also characterized.

[0008]

The concave portion absorbs the pressure increase / decrease deformation inside the bottle, and the changed portions of the surfaces of the shallow concave portion and the deep concave portion maintain the rigidity of the bottle and improve the buckling resistance and the like. This strength is further improved by forming the ribs. Further, since the deep recess is formed so as to extend below the shallow recess, it is possible to form a rib strip in the vertical direction over the lower portion of the recess and the bottle peripheral wall portion while maintaining the deformation absorbability of the recess itself. The buckling resistance of this portion can be further improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 is a front view showing an embodiment of the present invention, FIG.
(A) and (B) are AA enlarged sectional views and BB enlarged end views of FIG. 1, and FIGS. 3 (A) and 3 (B) are morphological diagrams showing modified examples of the concave portions of FIGS. 4 is a front view showing another embodiment with respect to FIG. 1, FIGS. 5 (A) and 5 (B) are CC enlarged cross-sectional views and DD enlarged end views of FIG. 4, and FIG. It is a form figure showing the modification of.

The plastic bottle shown in FIGS. 1 and 2 may have any shape, but as an example, a bottle body 1 having a substantially cylindrical shape has a constricted portion 2 formed at a substantially intermediate height position. A plurality of circumferential recessed grooves 5 are provided in the body peripheral wall 4 of the upper bottle body upper part 3. A plurality of deep recesses 9 which are recessed in a vertically long plate shape from the vicinity of the waist 2 to the vicinity of the bottle bottom 8 are provided around the body peripheral wall 7 of the lower portion of the bottle body 6 below the waist 2 at appropriate intervals. I am doing it.

As shown in FIG. 2, the deep recessed portion 9 is formed as a peripheral recessed shallow recessed portion 10 which is bent and recessed from the body peripheral wall 7 with an appropriate radius, and a slight outwardly protruding ridge on the inside thereof. And a rib 11 in the shape of an enclosure
Is formed as a recess deeper than the shallow recess 10 inside, and the lower portion of the deep recess 9 extends beyond the lower end of the shallow recess 10 to the outer peripheral body wall portion 7 on the lower side. Further, the peripheral portion of the extending portion 9a is bent as it is to the peripheral wall 7 of the body portion to be continuous.

As shown in FIG. 3 (A), the deep recessed portion 9 having the above-described structure may be formed so that the shallow recessed portion 10 and the rib 11 are concentrically formed over the entire outer circumference thereof. Even with such a concentric configuration, the shallow recess 10 and the rib 1
1 and the multiple concave and convex configuration of the deep concave portion 9 enhances the pressure resistance against the increased pressure inside the container and facilitates the inward deformation so that the reduced pressure can be absorbed easily. Acts as a reinforcing rib for
The buckling resistance can be increased as compared with the conventional structure, and the container strength during absorption under reduced pressure can be increased.

Further, as shown in FIG.
Upside down from the above configuration, that is, the deep recess 9 is replaced by the shallow recess 1
It is also possible to adopt a configuration in which it is formed up to the outer side above 0, and it operates in the same manner as above.

In the structure shown in FIGS. 1 and 2, the deep concave portion 9 penetrates the shallow concave portion 10 in the lower part of the concave portion and is vertically arranged to reach the body peripheral wall 7 portion. As a result of forming the reinforcing structure such that the vertical ribs pass through in the lower part of the recessed portion, a higher buckling strength than that of the configuration of FIG. 3 is provided.

The plastic bottles shown in FIGS. 4 and 5 are provided with a plurality of vertically elongated dish-shaped shallow recesses 12 at appropriate intervals in the peripheral wall 7 of the lower portion 6 of the bottle body 1 having the same shape as described above. Then, a deep deep recess 13 deeper than the deep recess 13 is formed in the lower part of the shallow recess 12, and the lower part of the deep recess 13 is
It extends beyond the lower end of the shallow recess 12 to the peripheral wall 7 portion on the lower side as it is, and the peripheral portion of the extending portion 13a is bent to the peripheral wall 7 portion as it is so as to be continuous.

The shallow recess 12 is formed as a flat surface that is appropriately recessed inside the peripheral edge portion 14 that is bent and recessed from the peripheral wall 7 with an appropriate radius, and the deep recess 13 is the flat surface of the shallow recess 12. Although it is formed as a concave shape bent from the surface, this concave shape may be arbitrary.

FIG. 6 shows a modified example of the recessed portions of FIGS. 4 and 5, in which the deep recessed portion 13 is formed up to the upper portion of the shallow recessed portion 12, or although not shown, FIG.
Similarly, it is possible to form the concentric circles or to extend the deep recess 13 up to the outer side above the shallow recess 12.
Even in such a configuration, the shallow recess 12 and the deep recess 13 having different surfaces act as a double rib, and the extended portion 13a
Acts as a vertical rib, so that the same action as in FIGS. 1 and 3 can be achieved.

Further, although not shown, FIGS.
In the above configuration, it is possible to form a rib similar to the rib 11 of FIG. 2 on the peripheral edge portion of the deep recess 13 in the shallow recess 12, and by doing so, the strength of the container body can be further enhanced. The configuration of the recesses in each of FIGS. 1, 3 and 4, 6 can be selectively set as appropriate depending on the material, strength, size, capacity, etc. of the bottle body 1.

[0019]

As described above, according to the plastic bottle of the present invention, since the recess for absorbing reduced pressure has the above-mentioned structure, the strength against the increased pressure in the container can be enhanced and the reduced pressure deformation can be absorbed, and the plastic bottle can withstand The effect of increasing the strength of the container such as buckling strength can be achieved. The above effect is further enhanced by forming ribs at the boundary between the shallow recess and the deep recess.

Further, by extending the lower part of the deep recessed portion through the lower end of the shallow recessed part and extending it to the lower outer side, it is possible to remarkably effectively reinforce the lower part of the container which is most likely to receive a load and buckles easily.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a plastic bottle of the present invention.

2A and 2B are sectional views of FIG. 1, in which FIG. 2A is an enlarged sectional view taken along line AA, and FIG. 2B is an enlarged end view taken along line BB.

FIG. 3 is a modification of the recess of FIG. 1, and FIGS. 3A and 3B are front views of the recess showing different modifications.

FIG. 4 is a front view showing an example of another plastic bottle of the present invention.

5A and 5B are sectional views of FIG. 5, in which FIG. 5A is an enlarged sectional view taken along line CC, and FIG. 5B is an enlarged end view taken along line DD.

FIG. 6 is a front view of a concave portion showing a modified example of the concave portion of FIG.

FIG. 7 is a front view showing an example of a conventional plastic bottle.

[Explanation of symbols]

 1 Bottle body 2 Constricted part 3 Bottle body upper part 4 Body part peripheral wall 5 Concave groove 6 Bottle body lower part 7 Body part peripheral wall 8 Bottle bottom 9 Deep concave part 9a Deep concave part extension part 10 Shallow concave part 11 Rib 12 Shallow concave part 13 Deep concave part 13a Extension of deep recess

Claims (3)

[Claims] 1. A plastic bottle having a concave portion for absorbing reduced pressure deformation on a peripheral wall of a body portion, wherein a shallow concave portion is formed near a peripheral portion of the concave portion, and deep concave portions having different surfaces are formed in the shallow concave portion. Plastic bottle to do. 2. The plastic bottle according to claim 1, wherein a boundary between the shallow recess and the deep recess is defined by a rib. 3. The plastic according to claim 1, wherein the lower part of the deep recess extends to the outside of the shallow recess, and the extended peripheral edge of the deep recess is continuous with the peripheral wall of the bottle. Bottle.