JP2002326618A - Biaxially drawn and blow-molded container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biaxially drawn and blow-molded container which does not generate the reduction of strength with a small capacity, absorbs deformation, of which the appearance is favorable, and also, wherein depressurization- absorbing panels are made smaller. SOLUTION: An annular groove section is formed on the peripheral wall, and a plurality of depressurization-absorbing panels are provided under the annular groove section. A protruding or indented vertical rib is formed on both side end sections of the depressurization-absorbing panels. Then, the wall surface between the vertical ribs is expanded to the outside. In addition, the upper end section of the depressurization-absorbing panel is formed in such a manner that the upper end section is substantially adjacent to a lateral rib which is connected with the lower section of the annular groove section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biaxially stretched blow-molded container, and more particularly, to a vacuum-absorbing panel for filling a fruit juice, oolong tea or the like in a heated state and then reducing the deformation of the container caused by decompression accompanying cooling. The present invention relates to a biaxially stretch blow-molded container that absorbs in consideration of a structure or a position.

[0002]

2. Description of the Related Art Conventionally, a biaxially stretch blow-molded container of a thermoplastic polyester such as polyethylene terephthalate (PET) has excellent transparency and surface gloss, impact resistance, gas barrier properties, and the like. Widely used as containers for various beverages. This biaxially stretch blow molded container is
Most of them are relatively large round bottles with a capacity of 1.5 to 2 liters, and their usage is such that fruit drinks, oolong tea and other beverages are heated to about 90 ° C., and then filled into the blow-molded container, The lid is capped and sealed, then cooled and returned to room temperature before shipping. This round bottle expands after filling and sealing, and then shrinks and deforms due to reduced pressure inside the bottle during cooling,
As shown in FIG. 7, the annular groove b formed in the peripheral wall a, provided with a plurality of vacuum panels d having a length L ₂ which occupies a large ratio to the length L ₁ of the bottle body portion c at its lower At the same time, a column e is formed between them, and the reduced pressure absorbing panel d absorbs the shrinkage deformation. As a method for filling the beverage, there is also an aseptic filling method. However, after filling oolong tea or the like, the pressure in the container tends to be reduced, and similarly, the molded container absorbs shrinkage deformation.

[0003]

Since the conventional biaxially stretched blow-molded container is a relatively large-capacity round bottle containing 1.5 to 2 liters, it shrinks under reduced pressure during cooling after filling and sealing. The deformation is absorbed by the plurality of reduced-pressure absorbing panels having the above configuration, and there is no particular problem in appearance due to the deformation. However, recently, the demand for a biaxially stretched blow-molded container having a small capacity, that is, a small capacity of about 200 to 900 ml has been increased, the production amount has been increased, and deformation due to decompression due to cooling after heat sterilization and expansion has become noticeable. became.

[0004] This deformation has a problem that the reduced-pressure absorbing panel d is deformed in a concave shape, and in particular, the straight column portion e is deformed in a concave shape, so that the appearance is remarkably reduced and the strength is also lowered. This is because even in the case of a biaxially stretched blow-molded container having the same structure, if the container has a large capacity, the amount of reduced pressure after expansion after filling and sealing is relatively small, and the current reduced-pressure absorption panel d is deformed into a concave shape. In contrast, when the capacity is small, the reduced pressure amount becomes relatively large, and the absorption cannot be performed by the current reduced pressure absorption panel d.

Therefore, the thickness of the container cannot be reduced in order to improve the rigidity of the body, so that the container has to be formed using many materials. When the capacity of the round bottle is reduced, the amount of decompression absorption is increased. To increase the length of the decompression absorption panel d in the axial direction with respect to the bottle body c, the contents of the body of the round bottle are reduced. And the space for attaching a label for enhancing the product value is reduced, which causes inconvenience.

Accordingly, it is an object of the present invention to improve the appearance by absorbing deformation without causing a decrease in strength even with a small capacity, and to enable molding with a smaller amount of material. An object of the present invention is to provide a biaxially stretch blow-molded container in which a space for labeling is sufficiently ensured by reducing the size of a panel.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and has the following configuration. That is, according to the present invention, in a biaxial stretch blow-molded container in which an annular groove is formed in a peripheral wall and a plurality of reduced-pressure absorbing panels are provided below the annular groove, a concave or convex vertical rib is formed in the reduced-pressure absorbing panel,
A biaxially stretched blow-molded container is provided, wherein a wall between the vertical ribs is bulged outward.

Further, according to the present invention, there is provided the above-described biaxially stretch blow-molded container, which is an aggregate of a plurality of ribs in which longitudinal ribs formed in the reduced-pressure absorption panel are formed intermittently.

Further, according to the present invention, there is provided the above-described biaxially stretch blow-molded container, wherein an upper end portion of the reduced-pressure absorbing panel is formed substantially adjacent to a lateral rib connected below the annular groove.

[0010]

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

FIGS. 1 to 4 show an embodiment of the present invention. In this drawing, the biaxially stretched blow-molded container 1 has an annular groove 3 formed in a peripheral wall 2 and a plurality of reduced pressure absorbing panels 5 provided below the annular groove 3. The concave or convex vertical ribs 13 are formed on both side ends of the decompression absorption panel 5, and the wall surface 14 between the vertical ribs 13 is bulged outward, as shown in FIG. As described above, the vertical cross-sectional shape of the wall surface is formed into a curved shape that protrudes outward. Further, the upper end portion 5a of the reduced pressure absorbing panel 5 is formed substantially adjacent to the horizontal rib 4 connected below the annular groove portion 3.

Although the vertical ribs 13 are shown as concave in the figure, they may be convex. However, the concave portion increases the thickness of the connecting portion between the vertical rib 13 and the wall surface 14 to prevent expansion of the vertical rib 13 after filling and sealing. Of the wall portion 14 during the decompression deformation,
1, and the deformation of the column portion 11 can be reliably prevented. FIG. 3 shows a YY cross section of FIG.

Next, the vertical ribs 13 and the vertical ribs 1
In order to confirm the effect of bulging the wall 14 between the three outwards, the 500-ml biaxially stretched blow-molded container 1
b, that is, the swelling amount of the wall surface 14: E = 0.5 mm, the swelling amount of the column portion 11: F = 0.3 mm, the radius of curvature of the wall surface 14: R
= 190 mm and the same 500 ml biaxially stretched blow molded container for comparison, i.e., E = F = R = 0 mm and the other dimensions were the same, and the results are shown in FIG. . According to FIG. 5, it can be seen that even if the suction amount due to the reduced pressure is considerably large, the degree of reduced pressure is reduced, and it is difficult to deform.

FIG. 6 shows an embodiment of the second aspect of the present invention. In this figure, the biaxially stretched blow-molded container 1 has a plurality of longitudinal ribs 13 formed in a reduced-pressure absorbing panel 5 formed intermittently. This is an assembly of ribs 15 and 16.
Although the figure shows two parts, the present invention is not limited to this, and three or a large number of circular or square ribs may be provided from above to below. Other configurations and operations are the same as those of the embodiment of FIGS.

As described above, the present invention has been described with reference to the drawings. However, as long as it does not deviate from the gist of the present invention, an embodiment in which these configurations or obvious configurations in the bottle are appropriately combined is also included in the technical scope of the present invention. It should be understood that

[0016]

According to the container of the present invention, not only a large-capacity container but also a small-capacity container can absorb the deformation at the time of decompression without lowering the strength, and has a good appearance. Since the absorption panel can be made smaller, it becomes easier to attach a label, and the commercial value can be increased. In addition, since the rigidity of the body is improved, the thickness of the container can be reduced, so that the target container can be formed with a smaller amount of material than the conventional one.

[Brief description of the drawings]

FIG. 1 is a side view of a biaxially stretch blow-molded container showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing a part of a half-cut portion of FIG.

FIG. 3 is a cross-sectional view taken along line YY of FIG.

FIG. 4 is an enlarged view of a wall portion of FIG. 3;

FIG. 5 is a characteristic diagram showing a relationship between a degree of pressure reduction and a suction amount.

FIG. 6 is a side view of a biaxially stretch blow-molded container showing another embodiment of the present invention.

FIG. 7 is a side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Biaxial stretch blow molding container 2, a peripheral wall 3, b annular groove part 4, 10 horizontal rib 5, d decompression absorption panel 5a upper end part 5b lower end part 11, e pillar part 13 vertical rib 14 wall surface 15, 16 rib

Claims (3)

[Claims] 1. A biaxial stretch blow-molded container having an annular groove formed in a peripheral wall and a plurality of reduced pressure absorbing panels provided below the annular groove, wherein a concave or convex vertical rib is formed in the reduced pressure absorbing panel. A biaxially stretch blow-molded container characterized in that the wall between the two is bulged outward. 2. A plurality of ribs formed by intermittently forming vertical ribs formed in the reduced-pressure absorption panel.
The biaxially stretch blow-molded container according to the above. 3. The biaxially stretch blow-molded container according to claim 1, wherein an upper end portion of the reduced-pressure absorbing panel is formed substantially adjacent to a lateral rib connected below the annular groove.