JP2001278234A - Reinforcing rib of bottle barrel portion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing rib of a bottle barrel in which the buckling strength of horizontal recessed ribs provided on a waist portion of the bottle body barrel is further reinforced. SOLUTION: A bottle comprises a mouth, a shoulder, a barrel and a bottom, the barrel comprises an upper barrel body and a lower body and a waist, horizontal recessed ribs comprising an arc surface connected to a lower end of the upper barrel, and an arc surface and a valley surface connected to the lower barrel are formed on the waist, longitudinal reinforcing ribs are arranged on the horizontal recessed ribs at equal intervals, and a connection portion of the end of the reinforcing ribs to the horizontal recessed ribs is wide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing rib for a bottle body, and more particularly, to a reinforcing rib disposed in a longitudinal direction in a horizontal concave rib provided on a bottle waist.

[0002]

2. Description of the Related Art A bottle in which a laterally concave rib is provided at a waist portion of a bottle body to facilitate reinforcement of the body and easy grasping of the bottle is conventionally known.

[0003]

However, in the conventional bottle, the rigidity of the body portion can be improved by the lateral concave rib, but there is a problem that it does not contribute to the enhancement of the buckling strength. To solve this, as shown in FIG.
Reinforcing ribs for a bottle body have been proposed in which reinforcing ribs extending in the vertical direction are arranged at equal intervals in the horizontal concave ribs so as to increase the buckling strength of the waist portion. In FIG. 5, Aa
Is a bottle having a mouth 1a and a shoulder 2a, a body 3a and a bottom 4a, a is a laterally concave rib provided at a waist portion of the body, and b is a reinforcing rib.

[0004] However, the bottle Aa can maintain a certain buckling strength by providing the reinforcing ribs b on the lateral concave ribs a. The connection between the portion b1 and the lower end portion b2 with the laterally concave rib a becomes narrow, stress is concentrated there, and the buckling strength cannot be further increased. When the amount is reduced, the thickness of the trunk becomes thinner and the buckling strength decreases, so that the problem of restriction on the reduction has arisen.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a reinforcing rib for a bottle body in which the buckling strength of a laterally concave rib provided on the waist portion of the bottle body is further enhanced. With the goal.

[0006]

According to the present invention, there is provided a bottle comprising a mouth and a shoulder, and a body and a bottom, as a reinforcing rib for the body of the bottle. , Consisting of an upper torso, a lower torso, and a waist, and the waist is formed with an arcuate surface connected to the lower end of the upper torso, and a laterally concave rib consisting of an arcuate surface and a valley connected to the lower torso In addition, a configuration is adopted in which longitudinal reinforcing ribs are arranged at equal intervals in the laterally concave ribs, and a connection portion between the laterally extending ribs at the ends of the reinforcing ribs is wide.

As a specific embodiment, a configuration is adopted in which the upper end and the lower end of the reinforcing rib, or any one of the connecting portions is formed wide.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, A is a bottle, which is formed by biaxial stretch blow molding using PET, and includes a mouth 1, a shoulder 2, a body 3, and a bottom 4.

A bulging ring 5 and a neck ring 6 are provided on the outer periphery of the mouth 1, and a portion below the neck ring 6 is expanded in diameter and continues to the shoulder 2.

The trunk 3 comprises an upper trunk 7 and a lower trunk 8, and a waist 9 between the upper trunk 7 and the lower trunk 8. The upper body 7 has a plurality of horizontal ribs 10 having a circular cross section.
1 is formed. The lower body 8 has a diameter larger than that of the upper body 7, and serves as a support for a plurality of bottle body walls.
2 and a reduced-pressure absorbing surface 15 disposed between the adjacent arc-shaped walls 12 and composed of an inclined wall 13 and a flat wall 14.

As shown in FIGS. 2 and 3, the waist portion 9 is connected to the enlarged step portion 11 of the upper body portion 7 and is connected to the lower body portion 8.
Is formed. The lateral concave rib 16
Is formed by upper and lower arcuate surfaces 16a and 16b and a gently curved valley surface 16c. Has been established. A plurality of reinforcing ribs 18 extending in the vertical direction are arranged at equal intervals in the horizontal concave rib 16.

The reinforcing ribs 18 are formed at the upper end 18a and the lower end 18b at the arcuate surfaces 16a, 16b of the lateral concave rib 16.
In the central portion 18c, the rib protrudes from the surface of the laterally concave rib 16 by a predetermined height, and the ridge line of the rib is formed in an arc shape. The width of the reinforcing ribs 18 is
a and 18b are wide, and the center 18c is narrow.
The connecting portions of the reinforcing ribs 18 with the lateral concave ribs 16 on both sides are in the shape of a drum with a narrow central portion. In the embodiment, the central portion 18
The width of the upper and lower ends 18a and 18b is about 2.4 with respect to the width of c.
Doubled

A horizontal rib 19 is provided at the lower end of the lower body 8 and continues to the bottom 4. The bottom portion 4 includes a bottom end wall 20 and a bottom wall 21 that protrudes upward from the bottom end wall 20.
A plurality of known radial reinforcing ribs 22 are provided on the bottom wall 21.

Next, the laterally concave rib 1 disposed on the waist 9
The function and effect of the reinforcing rib 6 and the reinforcing rib 18 will be described. The rigidity of the body 3 can be increased by the lateral concave rib 16 and the bottle can be easily gripped. Further, the reinforcing ribs 18 are provided, and the upper and lower ends of the reinforcing ribs 18 are connected to the outer ends of the arc surface of the laterally concave ribs 16, and both upper and lower connecting portions are widened, so that the stress at the upper and lower ends 18 a and 18 b is increased. Are dispersed and buckling strength is enhanced.

Next, a description will be given of a modified embodiment of the reinforcing rib provided on the laterally concave rib at the waist portion. In the above embodiment, the connecting portions at the upper and lower ends of the reinforcing ribs are made wide, but in the present embodiment, only the lower end is made wide. Since the configuration other than the reinforcing ribs is the same as that of the above-described embodiment, only the configuration related to the reinforcing ribs will be described.

As shown in FIG. 4, the same horizontal concave ribs 30 as those of the above embodiment are formed in the waist portion of the bottle B, and the reinforcing ribs 3 are provided at equal intervals in the horizontal concave ribs 30.
1 is provided. The reinforcing rib 31 has its upper end 31
a and the lower end 31b, the 30
a, 30b, and protrudes from the valley surface 30c of the laterally concave rib 30 by a predetermined height at the central portion 31c.
The ridge of the rib is formed in an arc shape.

The connecting portions of the reinforcing ribs 31 with the lateral concave ribs 30 on both sides are wide at the lower end 31b and narrow at the center 31c to the upper end 31a, and are repellent.

Next, the function and effect will be described. Since the lower end 31b of the reinforcing rib 31 has a large width and is connected to the arc wall of the laterally concave rib 30, the lower end 31b and the laterally concave rib 30 at the lower end 31b are not connected. Since the connecting portion is widened and the stress applied to the reinforcing ribs 31 is dispersed, the buckling strength of the body 3 can be increased.

[Buckling Strength Analysis] Next, the buckling strength of the bottle of the present invention will be described based on analysis of strength calculation.
First Embodiment Bottle A, Second Embodiment Bottle B of the Present Invention
Was calculated for buckling strength as compared with the conventional bottle Aa. For the analysis of the waist portion of the bottle, an analysis shape as shown in FIG. 6 was used. In FIG. 6, Aa1 is
The analysis shape of the conventional bottle Aa, B1 is the analysis shape of the bottle B of the second embodiment, and A1 is the analysis shape of the bottle A of the first embodiment.

The resin material is PET (Young's modulus E = 350K)
g / mm ² Hoisson's ratio ν = 0.35),
The diameter of the lower trunk, the diameter and the height of the waist are the same as those of the conventional bottle Aa and the bottles A and B of each embodiment, the upper trunk has a diameter of 88 mm, and the lower trunk has a diameter of 105 m.
m, diameter of lateral concave rib valley surface 78 mm, reinforcing rib height 2
The strength of the bottle waist was calculated by setting the thickness to 6.8 mm and the thickness to 0.333 mm.

In the strength calculation, the lower part of each bottle-shaped analytical product was fixed, a compressive force was applied from above, and the amount of deformation at the upper end of the analytical-shaped product was obtained. As a result, an analysis graph as shown in FIG. 7 could be obtained. The points X, Y and Z in the graph are bottle Aa, bottle B and bottle A
Is the intersection of the equilibrium curves before and after the buckling of the waist, and each bottle buckles at those intersections and bifurcations.

Next, a test product of the analysis shape Aa1 is prepared,
When the buckling strength was measured, it was 35 kg. When this is taken as the buckling strength at point X in the graph and the analysis value is converted, a graph with numerical values shown in FIG. 7 is obtained. Based on the results, the buckling strengths of Bottle A and Bottle B were obtained as shown in the following table.

[0023]

[Table 1]

According to the above analysis results, the buckling strength of the bottle B of the second embodiment exceeds 40 kg, which is 33% higher than that of the conventional bottle Aa, and the bottle A of the first embodiment is 172.6%. It is apparent that the effect of the reinforcing rib is great.

[0025]

The present invention has the following effects because it is configured as described above. By increasing the width of the connecting portion at the lower end of the longitudinal reinforcing ribs arranged at equal intervals in the horizontal concave rib, the stress applied to the connecting portion was reduced, and the buckling strength was further increased. .

[Brief description of the drawings]

FIG. 1 is a front view of a bottle according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view of a reinforcing rib.

FIG. 4 is a front view of a bottle according to a second embodiment.

FIG. 5 is an explanatory diagram of a conventional product bottle.

FIG. 6 is an explanatory diagram of a bottle analysis shape.

FIG. 7 is a graph of an analysis result.

[Explanation of symbols]

 A, B, Aa Bottle 3, 3a Body 7 Upper body 8 Lower body 9 Waist 10 Horizontal rib 11 Large diameter step 12 Arc wall 15 Decompression absorption surface 16, 30, a Horizontal concave rib 16a, 16b, 30a , 30b Arc surface 16c, 30c Valley surface 17 Strip 18, 31, b Reinforcing rib 18a, 31a Upper end 18b, 31b Lower end 18c, 31c Central part

Claims (2)

[Claims] 1. A bottle comprising a mouth, a shoulder, a torso and a bottom, wherein the torso comprises an upper torso, a lower torso, and a waist, and the waist includes a lower end of an upper torso. A laterally concave rib composed of an arcuate surface connected to the lower body and an arcuate surface and a valley surface connected to the lower body is formed, and longitudinal reinforcing ribs are arranged at equal intervals in the laterally concave rib, and an end of the reinforcing rib is provided. A reinforcing rib for a bottle body, characterized in that a connecting portion with a laterally concave rib of the portion is wide. 2. The reinforcing rib for a bottle body according to claim 1, wherein an upper end and / or a lower end of the reinforcing rib are formed to have a wide width.