JPH06336240A - Pressure resistant plastic bottle - Google Patents

Abstract

PURPOSE:To suppress the deformation of leg part or recess part caused by the action of carbon dioxide, etc., filled in a bottle by a method wherein narrow groove-like recess parts are formed in the bottom surface of a pressure resistant plastic bottle toward its center and lateral rib bodies are formed across the recess parts. CONSTITUTION:A pressure resistant plastic bottle has a plurality of leg parts 2 with ground contact parts 21 at their lowest ends spaced equally at the end part of a bottom part 12 forming a continuation of the body part. A bottom surface 22 is made up forming a continuation of the ground contact part 21 and sloping gradually upwardly toward the center of the bottle. In this case, narrow groove-like recess parts 3 are formed in the bottom surface 22 toward the center of the bottle. Lateral rib bodies 4 are formed across the recess parts 3. When the bottle is filled with carbonated beverage, etc., a great inner pressure is exerted on the bottom part 12 by the action of carbon dioxide, etc., to produce stress on the bottom surface 22. Due to the reinforcing effect of the recess parts 3, however, the deformation of the leg parts 2 can be suppressed. Also, the deformation of the recess parts 3 such as causing widening can be suppressed by the lateral rib bodies 4.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a pressure resistant plastic bottle having a pressure resistant bottom.

[0002]

2. Description of the Related Art A pressure-resistant plastic bottle filled with beer, carbonated drinking water, etc. is formed by biaxially stretch blow molding a saturated polyester resin such as polyethylene terephthalate as shown in the front view of FIG. 13, a shoulder portion 14 connected to it, a body portion 11 and a pressure-resistant bottom portion 12
Those having are widely known.

As the pressure-resistant shape of the bottom portion, a plurality of leg portions 2 having the lowermost end portion as a ground portion are formed at equal intervals on the peripheral end portion of the bottom portion 12 connected to the body portion 11. The shape of the outer wall 23 is continuous with the body, the lowermost grounding portion 21 of the outer wall, the side wall 24 formed on both sides of the grounding portion, and the grounding portion are connected to the grounding portion and faced upward toward the center of the bottle. It has a basic shape with a gently sloping bottom surface 22.

As shown in the bottom view of the leg portion of the conventional pressure-resistant plastic bottle in FIG. 4, the shape of the bottom portion of the bottle expands and deforms due to the action of internal pressure, the grounding point changes, and the standing posture of the bottle becomes unstable. In order to prevent such a situation, it is known that the bottom surface 22 of the leg portion 2 is provided with the concave portion 3 in the entire longitudinal direction. (Actual fair 2-1222)

[0005]

Since the bottle is provided with a recess in the entire bottom surface of the leg in the longitudinal direction, the shape of the bottom of the bottle, particularly the leg, expands and changes in the axial direction and the radial direction. Although it is effective to suppress the above, it is difficult to suppress the circumferential expansion and deformation of the bottle bottom portion because the concave portion is in the opening direction, and there is a tendency that the center portion of the bottom portion falls downward.

[0006]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional pressure-resistant plastic bottles described above and obtains further excellent pressure resistance, and its gist is the peripheral end portion of the bottom portion connected to the body portion. In the pressure-resistant plastic bottle, a plurality of legs having the lowermost end portion as a grounding portion are formed at equal intervals, and a bottom surface having a gentle slope that is connected to the grounding portion and that faces upward toward the center of the bottle is formed. The pressure-resistant plastic bottle is characterized in that a narrow groove-shaped recess is formed on the bottom face toward the center of the bottle, and a transverse rib body is provided so as to cross the narrow groove-shaped recess.

The present invention will be described below with reference to the accompanying drawings. 1 is a front view showing an example of a pressure resistant plastic bottle of the present invention, FIG. 2 is a sectional front view of a bottom portion, FIG. 3 is a bottom view of a leg portion, and FIG. 4 is a bottom view of a leg portion of a conventional pressure resistant plastic bottle. .

The pressure resistant plastic bottle of the present invention is shown in FIG.
As shown in FIGS. 3 to 3, a plurality of legs 2 having a grounding portion 21 at the lowermost end are formed at equal intervals on the peripheral end portion of the bottom portion 12 connected to the body portion 11 and are not connected to the grounding portion 21. In a pressure-resistant plastic bottle 1 having a bottom surface 22 that is gently inclined upwards toward the center of the bottle, a groove 3 is formed on the bottom surface 22 toward the center of the bottle, and the groove 3 is formed. The pressure-resistant plastic bottle 1 is characterized in that a lateral rib body 4 is provided so as to traverse.

The pressure-resistant plastic bottle of the present invention is used for filling contents such as beer, carbonated drinking water, etc. which generate an internal pressure, and for example, a saturated polyester resin bottle such as polyethylene terephthalate is preferable, and as shown in FIG. A plug portion 13 and a biaxially stretched shoulder portion 14 continuous with the plug portion 13;
Subsequently, the body portion 11 and the bottom portion 12 are provided.

The bottom portion 12 preferably has a basic structure of a pressure-resistant shape that projects downward in a hemispherical shape as shown in FIG. 2, and a plurality of leg portions are provided around the hemispherical bottom portion 12. 2 is bulged. Of course, a pressure resistant shape in which the central portion of the bottom portion 12 is recessed upward may be used.

As shown in FIG. 2, the leg portion 2 bulges out in a substantially right-angled triangular shape in vertical section, and the steeply inclined outer surface wall 23 and the gently inclined bottom surface 22 form a substantially right angle, and the ground portion is grounded. A basic shape in which side walls 24 are formed on both sides of the portion 21 is preferable.

On the bottom surface 22, a narrow groove-shaped recess 3 is formed toward the center of the bottle, and a lateral rib body 4 is provided.
It should be noted that if the lateral rib body 4 is formed so as to be orthogonal to the narrow groove-shaped recess 3, the reinforcing effect in the circumferential direction is excellent, but it may cross the narrow groove-shaped recess 3 obliquely. . Further, the horizontal rib body 4 is formed on the same surface as the bottom surface 22, and as a result, the narrow groove-shaped recess 3 is divided into two short recesses, which is excellent in the reinforcing effect, but the horizontal rib body 4 is slightly lower than the bottom surface 22. May be high.

The pressure resistant plastic bottle of the present invention is filled with carbonated drinking water or the like, and the bottom portion 12 is activated by the action of carbon dioxide gas or the like.
When a large internal pressure is applied to the bottom surface of the leg portion 2, axial, radial, and circumferential stresses act on the bottom surface 22 of the leg portion 2. Also, it is possible to suppress radial deformation, and moreover,
Since the narrow groove-shaped recess 3 itself is also reinforced by the lateral rib body 4, it is possible to prevent deformation such as expansion of the narrow groove-shaped recess 3 on the bottom surface 22.

[0014]

According to the present invention, the peripheral end of the bottom part connected to the body part is
In the pressure-resistant plastic bottle, a plurality of legs having the lowermost end portion as a grounding portion are formed at equal intervals, and a bottom surface with a gentle slope is formed which is continuous with the grounding portion and is directed upward toward the center of the bottle. Since the pressure-resistant plastic bottle is characterized in that a narrow groove-shaped concave portion is formed toward the center of the bottle, and a lateral rib body that crosses the narrow groove-shaped concave portion is provided, the leg portion has an axial direction of the bottle. Also, it is possible to suppress deformation in the radial direction, and since the narrow groove-shaped recess itself is also reinforced by the lateral rib body, it is possible to prevent deformation such as expansion of the narrow groove-shaped recess on the bottom surface. It will be possible and the bottom center will not fall downward.

[Brief description of drawings]

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

FIG. 2 is a sectional front view of the bottom of FIG.

3 is a bottom view of the leg portion of FIG.

FIG. 4 is a bottom view of a leg portion of a conventional pressure resistant plastic bottle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure-resistant plastic bottle 11 Body part 12 Bottom part 2 Leg part 21 Grounding part 22 Bottom surface 3 Narrow groove-shaped concave part 4 Horizontal rib body

Claims (1)

[Claims] 1. A plurality of legs, whose bottom end is a grounding portion, are formed at equal intervals on a peripheral end portion of a bottom portion connected to the body portion, and the legs are connected to the grounding portion toward the center of the bottle. In a pressure-resistant plastic bottle that has an upwardly sloping bottom surface,
A pressure-resistant plastic bottle, characterized in that a narrow groove-shaped recess is formed on the bottom face toward the center of the bottle, and a lateral rib body that crosses the narrow groove-shaped recess is provided.