JP2511931Y2 - Plastic bottle with reinforced ribs - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a plastic bottle with a reinforcing rib,
In particular, the present invention relates to the shape of reinforcing ribs of a biaxially stretched plastic bottle whose body has a polygonal cross section.

[Conventional technology]

BACKGROUND ART Conventionally, as a container for liquid foods, a plastic bottle having a body formed of a plurality of panel portions and having a regular polygonal cross section is widely used. This kind of plastic bottle is generally manufactured by blow molding a thermoplastic resin, for example, a parison made of polyethylene terephthalate, and biaxially stretching it.

In addition, in order to improve the strength of the body portion of such a plastic bottle, a plurality of reinforcing ribs in the vertical direction, the horizontal direction, or the diagonal direction are provided on the panel portion of the body portion (actual plan 1). -88807 publication).

[Problems to be solved by the device]

However, it is difficult to obtain the desired strength simply by forming the reinforcing ribs on the panel portion of the plastic bottle.For example, after the liquid food is put in the bottle and sealed, buckling occurs when sealing the cap portion. When the inside of the bottle is in a depressurized state due to deformation or a decrease in atmospheric temperature after sealing, the panel portion may be deformed unevenly and the appearance may be impaired. In addition, when pouring the liquid food in the bottle, when tilting the bottle while holding the panel part, only the gripped part of the panel part is likely to be deformed unevenly, so more than the desired amount of liquid is poured out. There was also a problem.

Therefore, the present invention provides a plastic bottle with a reinforcing rib capable of preventing the above-mentioned non-uniform deformation of the panel portion by a rib having a specific shape and eliminating the deterioration of the appearance and the functional problem due to the non-uniform deformation. Is intended.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention relates to a biaxially stretched plastic bottle in which a body is formed by a plurality of panel parts, and the body has a polygonal cross-section. In addition to being curved in the direction from the inclined shoulder portion to the bottom end of the bottle and formed over the entire body portion, the panel portion is provided with a plurality of horizontal reinforcing ribs protruding inward of the bottle, and the width of the panel portion. It is characterized in that the depth is substantially the same from end to end in the direction and the pitch is formed to be 5 times or more and 40 times or less the depth.

[Action]

With the above configuration, a large area of the panel portion can be adopted, the area for absorbing the reduced pressure is large, and moreover, the panel portion which is easily deformed indefinitely due to the increased area is formed by the reinforcing ribs of the above-described configuration. It is possible to prevent the indefinite deformation and to uniformly deform the entire panel portion.

〔Example〕

Hereinafter, the present invention will be described in more detail based on an embodiment shown in the drawings.

FIG. 1 is a partial sectional front view of a plastic bottle with a reinforcing rib, and FIG. 2 is a sectional view taken along line II-II of FIG.

In the body part 2 of the plastic bottle 1 shown in the figure, four vertically elongated circular panel parts 3,3 are connected by narrow corner walls 4,4, and the cross-sectional shape thereof has small cutout parts at four corners. It has a square shape. Further, a cap portion 5 and a bottom portion 6 similar to the conventional one are formed above and below the body portion 2, respectively. This plastic bottle 1 can be manufactured by blow molding a thermoplastic synthetic resin parison, as in the case of conventional plastic bottles.

In the plastic bottle 1 of the present embodiment, the panel portion 3 is curved inward of the bottle and is formed over the entire body portion 2 with a length from the inclined shoulder portion to the bottom end of the bottle.

In addition, a plurality of horizontal reinforcing ribs 7 projecting in a substantially V shape inside the bottle are formed in the panel portion from the end in the width direction of the panel portion as shown in FIG. As shown in the figure, they are formed with substantially the same depth. Further, the relationship between the pitch P and the depth d of the reinforcing rib 7 is
The pitch P is 5 times or more and 40 times or less of the depth d, that is, 5d ≦ P ≦ 4
It is set in the range of 0d. For example, when forming the reinforcing rib 7 having a depth d of 1 mm, the pitch P thereof is set in the range of 5 mm to 40 mm. At this time, when the pitch P is less than 5 times the depth d, that is, P <5d, the rib interval is too narrow and the buckling strength in the vertical direction is reduced. For example, after filling the liquid in the bottle, the cap portion There is a risk of buckling deformation when performing the sealing of No. 5. When the pitch P exceeds 40 times the depth d,
That is, in the case of 40d <P, the rib interval becomes too wide and the surface strength of the panel part 3 decreases, and the panel part 3 deforms unevenly due to the change in internal pressure after filling and sealing with liquid. Sometimes.

Therefore, as described above, the panel portion 3 is curved toward the inside of the bottle, and the panel portion 3 is formed to have a length from the inclined shoulder portion to the bottom end of the bottle and over the entire body portion 2, thereby increasing the area of the panel portion 3. Therefore, the area for absorbing the reduced pressure becomes large. Moreover, a plurality of horizontal reinforcing ribs 7 projecting inward of the bottle are provided in the panel portion 3 at substantially the same depth from one end to the other in the width direction of the panel portion 3, and the pitch is 5 times or more the depth. Since it is formed 40 times or less, indefinite deformation of the entire panel part 3 can be prevented, and the entire panel part 3 can be uniformly deformed.
The surface strength of can be improved.

The pitch P and the depth d of the reinforcing ribs 7 are determined by the volume and shape of the plastic bottle 1, for example, the height of the panel portion,
The width and the number can be appropriately set within the above range, and the shape can be formed in an appropriate shape such as a U-shape limited to the V-shape. Further, other parts than the reinforcing ribs can be formed similarly to the conventional plastic bottle.

Here, the result of an experiment conducted using a plastic bottle in which only the pitch of the reinforcing rib is changed will be described.

With the shape shown in Fig. 1 and Fig. 2, the capacity is 900ml and the weight is
32g, 230mm in height, 73mm in diameter 73mm plastic bottle body panel, 1mm deep, 4mm pitch (P <5
d), 20mm (5d ≤ P ≤ 40d), 45mm (40d <P) reinforcing ribs are formed, the buckling strength (50mm / min) of each bottle is measured, and the liquid is filled at 40 ° C. After sealing with an aluminum sealant and storing at 5 ° C. for one week, changes in appearance (deformation under reduced pressure) were observed.

 The results are shown in Table 1.

[Effects of the Invention] As described above, the plastic bottle with the reinforcing ribs of the present invention has the body panel part curved to the inside of the bottle, and the length from the inclined shoulder to the bottom end of the bottle, and the body part. By forming the entire area, the area of the panel portion can be increased, and the area for absorbing the reduced pressure can be increased. Moreover, a plurality of horizontal reinforcing ribs projecting inward of the bottle are provided on the panel portion at substantially the same depth from one end to the other in the width direction of the panel portion, and the pitch is 5
By forming at least twice and not more than 40 times, indefinite deformation of the entire panel portion can be prevented, the entire panel portion can be uniformly deformed, and the buckling strength and the strength against reduced pressure deformation can be improved. Therefore, it is possible to prevent buckling at the time of sealing after filling the liquid, and even if the inside of the bottle is in a depressurized state due to refrigeration storage or the like, the panel portion is uniformly deformed so that the appearance is not damaged. Further, as a function and effect of the reinforcing ribs, the unevenness of the capacity of the panel portion is reduced because the uneven deformation of the panel portion is prevented, and the uneven deformation of only the gripped portion of the panel portion when pouring the liquid food is also prevented. it can.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partial sectional front view of a plastic bottle with a reinforcing rib, and FIG. 2 is a sectional view taken along line II-II of FIG. 1 ... Plastic bottle, 2 ... Body part, 3 ... Panel part, 4 ... Corner wall, 5 ... Cap part, 6 ... Bottom part,
7 ... Reinforcing ribs, P ... Pitch, d ... Depth

Claims (1)

(57) [Scope of utility model registration request] 1. A biaxially stretched plastic bottle having a body portion formed of a plurality of panel portions, wherein the body portion has a polygonal cross-section. The panel portion is curved inside the bottle, and an inclined shoulder portion is formed. From the length to the bottom of the bottle,
In addition, a plurality of horizontal reinforcing ribs formed in the entire body and projecting inward of the bottle are formed on the panel portion at substantially the same depth from one end to the other in the width direction of the panel portion, and the pitch is deep. A plastic bottle with reinforced ribs characterized by being formed 5 times or more and 40 times or less than the above.