JPH1135027A - Plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic bottle which is easy to squeeze and sufficiently strong in practical use by dividing a body into an upper part, a middle part and a lower part, forming a reinforcement rib over the whole circumference on each boundary, and forming a plurality of recessed ribs over the whole on the middle part. SOLUTION: A generally cylindrical body part 1 is divided into three parts of approximately equal length of an upper part 11, a middle part 12 and a lower part 13 in the height direction, a reinforcement rib 2 over the whole circumference is formed at each boundary, and a plurality of recessed ribs 3 over the whole circumference are formed in the middle part 12. The reinforcement rib 2 over the whole circumference at the boundary of each division prevents deformation of the body part 1 in the radial direction, and shuts off the force to deform each division so as not to be transmitted to the adjacent section. A plurality of recessed ribs 3 over the whole circumference are formed on the middle part to which the maximum force is applied to make the middle part difficult to deform. Even when the whole bottle is reduced in thickness, the bottle is sufficiently strong for the practical use, and easy to squeeze when it is empty.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plastic bottle having a substantially cylindrical body.

[0002]

2. Description of the Related Art Conventionally, plastic bottles such as polyethylene terephthalate have been widely used for beverages and the like because of their excellent impact strength and light weight. Recently, plastic bottles are collected for disposal or recycling. There is a growing need for temporary disposal at home,
It is required to reduce the volume of plastic bottles from the time of collection to the final disposal.

For this reason, there has been proposed a plastic bottle having a substantially cylindrical body, which has a reduced wall thickness so as to be easily crushed.

[0004]

However, in the above-mentioned conventional plastic bottle having a substantially cylindrical body, if the wall thickness is reduced to facilitate crushing, the plug portion is used when the cap is driven in. Due to the downward force applied to the shoulder, the shoulder deforms, the temperature decreases after filling at high temperature, and the internal pressure decreases due to the temperature difference between summer and winter, the cylinder shape of the trunk is irregularly deformed into a triangular cylinder etc. There was a problem of doing.

[0005] Further, in the case of a bottle whose central part of a substantially cylindrical body is depressed from both sides to form a gripping part and which is easy to hold, when the wall thickness of the plastic bottle is reduced to facilitate crushing after use, When the vertical pressure is applied after filling and sealing, the internal pressure rises and the concave gripping part swells and deforms outward, or grasps the gripping part and opens when grasped. There was a problem that the body was crushed inward by force, and the contents easily jumped out of the spout.

Accordingly, it is an object of the present invention to provide a plastic bottle which is easily crushed and has sufficient strength for practical use.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problem, and the gist of the present invention is to divide a substantially cylindrical body into three parts, an upper part, a middle part and a lower part in the height direction. In addition, the plastic bottle is characterized in that reinforcing ribs are formed all around the boundary at the boundary, and a plurality of concave ribs are formed all around the intermediate portion at the intermediate portion.

As described above, a plurality of concave ribs extending over the entire circumference are formed at the intermediate portion of the substantially cylindrical body to which the most force is applied, so that the ribs are hardly deformed, and reinforcing ribs extending over the entire circumference are provided above and below the intermediate portion. Since it is formed, it has practically sufficient strength even when the overall thickness is reduced, and is easily crushed when emptied.

The intermediate portion of the substantially cylindrical body is depressed from both sides to form a grip portion, and at least a plurality of concave ribs extending continuously around the intermediate portion are formed in the grip portion. 2. The plastic bottle according to claim 1, wherein a concave rib extending over the entire circumference is continuously formed in the gripping portion, so that the gripping portion swells outward and deforms due to a gripping force. It is preferable because it is difficult to make.

The plastic bottle according to claim 1 or 2, wherein a reduced pressure absorbing surface is formed at a lower portion of the substantially cylindrical body. As a result, the internal pressure change is absorbed to some extent, and a reinforcing rib is formed around the entire circumference to prevent deformation of the adjacent part, so even if the lower part is deformed, the deformation is not transmitted to the middle part and the upper part preferable.

[0011] Further, the upper shoulder of the substantially cylindrical torso is horizontal when the portion from the outside of the plug portion to the outermost portion of the torso is substantially divided into an inner shoulder and an outer shoulder, and the inner shoulder is horizontal. 40 degrees to 4
The plastic bottle according to claim 1, 2 or 3, wherein at an angle of 5 degrees, the outer shoulder extends outward and downward at an angle greater than the inner shoulder. This is particularly preferable because the shoulder is less likely to be deformed when the cap is driven.

The plastic bottle of the present invention uses a plastic, for example, a polyester resin typified by polyethylene terephthalate, to first form a tubular material (hereinafter, referred to as a preform) as an intermediate product by injection molding. The preform is set in a blow mold while being heated to a stretching temperature, for example, 90 to 120 ° C. in the case of polyethylene terephthalate, and obtained by biaxial stretching blow molding by blowing high-pressure air or the like into the preform. .

The plastic bottle of the present invention has a body thickness of 0.2 to reduce the wall thickness and facilitate crushing.
It is preferably within a range of 2 to 0.27 mm. For this purpose, for example, a plastic bottle having a capacity of 2 liters can be suitably manufactured using a preform of 47 to 63 g.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing an example of the plastic bottle of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a front view showing another example of the plastic bottle of the present invention, FIG. 3 is a side view of FIG. 3, and FIG. 5 is a sectional view taken along line VV of FIG.

As shown in FIGS. 1 to 5, the present invention divides a substantially cylindrical body 1 into three parts, an upper part 11, an intermediate part 12, and a lower part 13, in the height direction. The plastic bottle is characterized in that the reinforcing ribs 2 are formed over the entire circumference and a plurality of concave ribs 3 are formed on the intermediate portion 12 over the entire circumference.

The upper part 11, the intermediate part 12, and the lower part 13 may be divided at a rate of about 1/3 of the total height.

Reinforcing ribs 2 formed at the boundaries between the sections prevent the body 1 from being deformed in the radial direction, and prevent the force to be deformed of each section from being transmitted to the adjacent section. In order to play a role of blocking, a concave groove having a width larger than that of the concave rib 3 described later or a plurality of concave grooves can be provided adjacent to each other to make it strong. It is preferable that two narrow grooves are juxtaposed and juxtaposed, and the reinforcing ribs 2 having the ridges 21 between them completely absorb and block the deformation of the reduced-pressure absorbing surface 5 and do not transmit the deformation to the intermediate portion 12. .

As shown in FIG. 1, the width W2 of the valley bottom of the reinforcing rib 2 is 4 to 12 mm, and the depth D2 is 2 mm.
~ 6 mm is preferred.

The intermediate portion 12 is formed with three endless ring-shaped concave ribs 3 over the entire circumference, and arranged so as to divide the intermediate portion into four.

The concave rib 3 is in the form of a thin concave groove, and is not an endless ring as in the present embodiment.
You may arrange | position so that it may become multiple spirally.

Here, the width of the concave rib 3 is 4 to 8 mm for the opening width W31, 1.5 to 3 mm for the half-width W32, and 1 to 2.5 mm for the depth D3. It can be used preferably.

The lower portion 13 of the substantially cylindrical body 1 has a reduced pressure absorbing surface 5 formed thereon. As shown in FIGS. 1 to 5, the decompression absorbing surface 5 may have a shape in which four to six gentle convex surfaces are arranged on the outside, or a flat surface, a gentle concave surface, or a fine uneven stripe (not shown). It may be arranged in a frame shape and divided into a planar shape.

The shoulder portion 111 of the upper portion 11 of the substantially cylindrical body 1 is divided into an inner shoulder portion 1111 and an outer shoulder portion 1112 from the outside of the plug portion 10 to the outermost portion of the upper portion 11 of the body. Sometimes, the inner shoulder 1111 extends at an angle of 40 to 45 degrees with respect to the horizontal, and the outer shoulder 1112 extends outward and downward at an angle greater than the angle of the inner shoulder. Even if a downward force is applied to the plug, the shoulder is not easily deformed, which is preferable.

Next, in the example shown in FIGS. 3 to 5, the intermediate portion 12 of the substantially cylindrical body 1 is depressed from both sides to form the grip portion 4 and three concave portions extending over the entire circumference of the intermediate portion. Rib 3
However, all three are continuously formed in the grip portion 4.

The grip portion 4 only needs to be large enough and deep enough to be grasped, and at least a plurality of the concave ribs 3 are continuously formed within the range of the height.
In addition to preventing the bulging deformation of itself, the reinforcing effect of the concave ribs 3 is not interrupted, the entire intermediate portion 12 is reinforced, and the crushing deformation inward when grasped is prevented, and the It is possible to prevent the contents from jumping out.

[0027]

According to the present invention, a substantially cylindrical body is divided into three parts, an upper part, a middle part, and a lower part in the height direction. In the middle part, it is a plastic bottle characterized by forming a plurality of concave ribs over the entire circumference, so even if the bottle wall thickness is reduced and it is easy to crush, even if the overall thickness is reduced, it is practical In addition to having sufficient strength, it is easy to be crushed when emptied, and the middle part of the substantially cylindrical body is depressed from both sides to form a gripping part and concave ribs around the entire circumference of the middle part By forming at least a plurality of strips continuously in the gripping portion, the gripping portion is swelled and deformed outward, or it is difficult to deform by the grasping force, and if a reduced pressure absorbing surface is formed in the lower portion, Due to the deformation of the decompression absorption surface, The deformation of the middle part and the upper part is not transmitted, and when the inner shoulder part and the outer shoulder part are almost divided into two parts, the inner shoulder part is horizontal. At an angle of 40 to 45 degrees, the outer shoulder portion is a plastic bottle that spreads outward and downward at an angle larger than the inner shoulder portion. At this angle, the shoulder portion may be deformed particularly when the cap is driven. It has an effect such as difficulty.

[Brief description of the drawings]

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

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

FIG. 3 is a front view showing another example of the plastic bottle of the present invention.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 10 Plug part 11 Upper part 111 Shoulder part 1111 Inner shoulder part 1112 Outer shoulder part 12 Middle part 13 Lower part 2 Reinforcement rib 3 Concave rib 4 Grip part 5 Decompression absorption surface

Claims (4)

[Claims] 1. A substantially cylindrical body is divided into three parts, an upper part, an intermediate part, and a lower part in a height direction. Reinforcing ribs are formed around the boundary between the three parts, and the intermediate part has a rib. And a plurality of concave ribs formed all around the plastic bottle. 2. An intermediate portion of a substantially cylindrical body portion is recessed from both sides to form a grip portion, and at least a plurality of concave ribs extending continuously around the entire intermediate portion are formed continuously in the grip portion. The plastic bottle according to claim 1, wherein 3. A vacuum absorbing surface is formed at a lower portion of a substantially cylindrical body.
The plastic bottle as described. 4. The upper shoulder of the substantially cylindrical torso has approximately two shoulders at the inner shoulder and the outer shoulder from the outside of the plug to the outermost part of the torso.
The inner shoulder portion extends at an angle of 40 to 45 degrees with respect to the horizontal when divided, and the outer shoulder portion extends outward and downward at an angle larger than the inner shoulder portion. Item 3
The plastic bottle as described.