JPS5911844Y2 - Synthetic resin biaxially stretched bottle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a biaxially stretched aluminum bottle made of resin.

Biaxially stretch-molded resin bottles have a thin wall in the area from the shoulder to the body due to the shaping method, and the strength of this area is weak, so generally the body is thin. Reinforcing recesses are formed on both sides to prevent deformation of thin parts.

Figure 1 shows a conventional two-wheeled elongated bottle, in which the part below the two-dot chain line is the body, and the part above is the shoulder, and the part extending from shoulder B to body A. is thinner than other parts.

A is a reinforcing recess formed on both sides of the trunk A, and in order to increase the strength of the trunk A, the recess a is formed from near the eyebrow B to near the lower end of the trunk A. .

However, in conventional biaxially stretched or shaped bottles made of synthetic resin, the reinforcing recesses a are shaped to have approximately the same depth over the entire length. There is a problem in that the concave deformation of the body A is concentrated on the label pasting surface b on the front and rear surfaces of the body, and especially when the liquid content is hot-filled liquid such as sauce, the concave deformation of the label pasting surface b occurs. Since the deformation becomes quite large, the appearance deteriorates and the commercial value is lost.

For example, the sauce is filled at a temperature of about 55°C, and the mouth of the bottle is sealed immediately after the sauce is filled. As the liquid cools down, the pressure inside the bottle is reduced, causing the body of the bottle to become concave and deform.

This amount of decompression deformation is small when the outside temperature is high to a certain extent and the temperature of the liquid content does not become too low, but in winter, the temperature of the liquid content becomes quite low and the deformation amount of the bottle body becomes considerably large.

In the conventional bottle, as mentioned above, the reinforcing recesses a on both sides of the body A have approximately the same depth over the entire length, so both sides of the body hardly deform over the entire length, and therefore the pressure is reduced. Since the deformation is concentrated on the label attachment surface b on the front and rear surfaces of the torso, the label attachment surface b is greatly depressed and deformed, and since this deformation continues throughout the winter,
The label attachment surface b will be permanently deformed in a concave state.

This invention was created in view of these circumstances,
The purpose of this is to disperse the concave deformation of the body due to internal depressurization to both sides of the body where the reinforcing recesses are formed, thereby minimizing the concave deformation of the label pasting surface. The object of the present invention is to provide a biaxially stretched or shaped bottle made of resin.

That is, the biaxially stretched plastic bottle of the present invention has a structure in which the depth of the reinforcing recesses formed on both sides of the body gradually becomes shallower from the part near the shoulder toward the lower end. With this structure, since both sides of the body are deformed to some extent by the internal reduced pressure in the portion where the reinforcing recess is shallow, the amount of concave deformation of the label pasting surface can be reduced.

An embodiment of the present invention will be described below with reference to the drawings.

In Figures 2 to 4, A is the torso, B is the eyebrows,
The part extending from shoulder part B to torso part A is thinner than other parts.

A is a reinforcing recess formed on both sides of the body A, and this recess a extends from near the shoulder B to near the lower end of the body A, and the depth of the recess a is equal to the depth of the shoulder A. It is deepest in the part near B, and below this part,
It gradually becomes shallower towards the lower end.

Note that this biaxially stretched or shaped bottle is made of, for example, polyethylene terephthalate resin. A bottle made of polyethylene terephthalate has excellent mechanical strength, chemical resistance, and transparency, and a bottle made of polyvinyl chloride resin is also used. There is no concern that plasticizers or residual monomers will adversely affect human health, and it is also lighter than general resins such as polyethylene and polypropylene, and has excellent gas barrier properties against oxygen and carbon dioxide gas.

Therefore, in this biaxially stretched or shaped bottle, since the reinforcing recess a is deepened in the area near the eyebrow part B,
The thin part extending from the waste part B to the body part A can be sufficiently reinforced, and since the strength of the body part A is higher as it approaches the bottom of the bottle, the reinforcing concave part a gradually increases toward the lower end. Even if it is shallow, the strength of the body part A can be ensured sufficiently.

In this biaxially stretched oval-shaped bottle, the strength against decompression deformation on both sides of the body forming the reinforcing recess a becomes weaker as the reinforcing recess a becomes shallower. Both sides will also undergo concave deformation to some extent due to the internal reduced pressure, and therefore, the amount of concave deformation of the label attachment surface b can be reduced by that amount.

The depth of the reinforcing recess a may be selected depending on the size and shape of the bottle.

The table below shows that the width V between both sides at the middle part of the body A is approximately 58 mm, the width S between the front and rear label attachment surfaces b and b is approximately 59 mm, the height H of the body is approximately 130 mm, and the body Part weight (weight of trunk A excluding the bottom part inside the grounding point P) is 0.0
We prototyped several types of bottles with a weight of 45 to 0.055 g/cm2 as shown in the figure, in which the reinforcing recesses a on both sides of the body became gradually shallower toward the lower end. This shows the results of a test in which sauce at 55°C was filled and sealed and placed at a temperature of -5°C for two weeks. S) One with d of 1.5mm and one with 2.0mm 3
．． Test results are shown for three types of prototype bottles, including one with a diameter of 0 mm.

In addition, the amount of decompression deformation in the table is a value obtained by measuring the amount of decrease in the width S between the label application surfaces b and b at the middle part of the body A.

As can be seen from this table, in a bottle with the above dimensions and shape, the depth d of the deepest part of the reinforcing recess a should be 1.5 to 1.
If 3.0 mm is selected, the amount of decrease in the width S between the labeling surfaces b and b can be kept to 5.9 mm or less (the amount of concave deformation on one side of the labeling surface is 2.5 mm or less); Since the amount of deformation hardly affects the appearance, the commercial value is not impaired.

In addition, in the case of a bottle having the above dimensions and shape, the depth d of the deepest part of the reinforcing recess a should be about 2.0 mm on the label attachment surface b.
It is most effective in reducing the amount of concave deformation.

As mentioned above, the biaxially stretched large-shaped resin bottle of the present invention is
By making the depth of the reinforcing recesses formed on both sides of the body gradually shallower from the part near the shoulders toward the lower end, the strength against decompression deformation on both sides of the body is weakened. The concave deformation of the body due to reduced pressure can be dispersed to both sides of the body where reinforcing recesses are formed, and therefore the concave deformation of the label attachment surface on the front and rear surfaces of the body can be suppressed to an extent that does not impair commercial value. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing a conventional biaxially stretched oval shaped bottle made of synthetic resin; FIGS. 2 and 3 are partially cutaway front and side views showing an embodiment of the present invention; FIG. FIG. 4 is a sectional view taken along the Z-Z line in FIG. 2. A... Torso, B... View part, a...
...Reinforcement recess, B...Label pasting surface.

Claims (1)

[Scope of utility model registration request] In a biaxially stretched or shaped bottle made of resin, the part extending from the waste portion to the body is thin, and reinforcing concave portions are formed on both sides of the body from near the shoulder to near the bottom end, and the depth of the concave portion is A biaxially stretched type bottle made of a composite resin, characterized in that the depth gradually becomes shallower from a portion near the shoulder toward the lower end.