JPH0644804Y2 - Container with reinforcing ribs - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a container with a reinforcing rib in which a reinforcing rib is formed on the container.

[Conventional technology]

In recent years, a synthetic resin container has been generally used as a container for soft drinks, and in particular, a so-called PET container has been widely used.

In this PET container, it is relatively easy to make the container thin, but if this is done, the strength of the container will be reduced, so ribs are formed on the container to reinforce it.

By the way, sterilization is indispensable when filling the contents, and a method of heating the contents to about 85 ° C and performing sterilization and filling at the same time, and after preliminarily washing the inside of the container with a sterilizing solution, the contents at room temperature are There is a method of filling. In the latter case, after washing the inside of the container with the sterilizing liquid, the container is inverted and drained, but at that time, it is ideal that the sterilizing liquid in the container is entirely discharged and not left in the container.

However, there is a close relationship between the rib shape and the residual amount of the sterilizing liquid, and the rib shape and the container strength.

That is, as a test sample, a rib-free container shown in FIG. 4, a lateral rib-formed container shown in FIG. 5, and a vertical rib-formed container shown in FIG. The following results were obtained when the relationship was examined.

First, the results shown in the following table were obtained by comparing the full-pouring volume of water poured up to the rim of each container with the volume of water when the container was immersed in water in that state.

From this table, the capacity difference is 55.06 ml for the ribless container, 48.69 ml for the container with vertical ribs, and 5.6 for the container with horizontal ribs.
It became 1 ml.

The higher the rigidity of the container, the smaller these volume differences,
It is clear that the container with the vertical ribs has less improvement than the container without ribs. On the other hand, it is clear that the degree of improvement is extremely large and the rigidity is remarkably improved in the container with the lateral ribs, which means that at the same time, the deflection of the container when holding the side surface of the container can be reduced. ing.

Here, an experiment was conducted on the relationship between the residual amount of the sterilizing liquid and the shape of the rib. In this experiment, as shown in FIG. 7, the amount of water remaining in each container was measured with each container being inverted. As a result, the residual values of the container without ribs and the container with vertical ribs were 0.43 ml and 0.44 ml, respectively, showing no significant difference, and the container with lateral ribs remained 5.72 ml.

For this reason, it is necessary to reduce the residual amount to the reference value by leaving it in the container having the lateral ribs for a long period of time or applying vibration.

In summary, it has been clarified that the container having the horizontal ribs is excellent in terms of the strength of the container, but the container having the vertical ribs is superior in terms of drainage of the sterilizing solution.

By the way, although there are various shapes of the container, a square
It is relatively common to use a deformed octagon with a 45 ° cutout or a polygonal shape. In such a case, it is desirable to strengthen the corners as well, but its shape is limited in that the sterilizing solution runs out of water.

[Problems to be solved by the invention]

As described above, there is a trade-off between the strength of the container and the residual amount of the sterilizing solution in the shape of the rib, and conventionally, either one had to be sacrificed.

The present invention has been made in view of the above-mentioned matters, and it is technically possible to provide a container with a reinforcing rib that makes the container strength and the residual amount of the sterilizing liquid compatible with each other, and at the same time, can strengthen the corner portion of the container. It is an issue.

[Means for solving problems]

The present invention has the following configuration in order to solve the above technical problems.

That is, a large number of ribs 3 extending obliquely with respect to the vertical direction are formed in the panel portion 2 on the side surface of the synthetic resin polygonal container 1.

Further, vertical ribs 5 were formed on the corners 4 of the polygonal container 1 along the vertical direction to obtain a container with reinforcing ribs.

The angle of the rib 3 is preferably about 30 ° to 60 °.

[Action]

A large number of ribs 3 are formed on the panel portion 2 of the container 1 extending obliquely with respect to the vertical direction thereof, and vertical ribs 5 are formed on the corners 4 of the polygonal container 1 along the vertical direction thereof. Therefore, drainage of water when the container is inverted is good.

Moreover, since the corner portions can be strengthened, the strength of the container can be improved as compared with the case where only the lateral ribs are formed.

Since the vertical ribs 5 are formed along the vertical direction of the container, the sterilizing liquid does not remain.

〔Example〕

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

The synthetic resin container 1 is formed by blow molding into a rectangular bottle shape, and the unequal side 8 is obtained by cutting the quadrilateral of the quadrangle at 45 °.
It has a rectangular shape. The long side is the panel portion 2 and the short side is the corner portion 4.

A large number of ribs 3 extending obliquely to the vertical direction of the container 1 are formed on the panel portion 2, and the ribs 3 are formed by forming a large number of kamaboko-shaped convex portions in parallel.
Further, as shown in FIG. 3, the corner portion 4 is formed with a vertical rib 5 having a U-shaped cross section along the vertical direction of the container 1.

The container 1 is made of polyethylene terephthalate.

In the above-described configuration, when sterilizing, the sterilizing liquid is jetted into the container in an inverted state of the container 1, but after the jetting, the sterilizing liquid flows in one direction along the rib as shown by F in FIG. Unlike the conventional horizontal rib, a large amount of sterilizing liquid does not remain on the rib portion.

When the amount of residual sterilizing solution was measured, the residual amount was 1.96.
It became ml. This is about 1/3 of the remaining amount in the conventional container with horizontal ribs.

As another example, when the residual amount of the sterilizing solution was measured for the ribs 3 having the angles of 30 ° and 45 °, the residual amount was 2.00 ml at the rib 3 angles of 30 ° and 1.94 ml at the same angle of 45 °. became. As described above, the residual amount of the sterilizing solution could be reduced to about 1/3 as compared with the conventional container with the horizontal rib.

In addition, a comparison was made between the full volume of water poured to the rim of the container and the volume of water when the container was submerged in that state, and an experiment on strength was carried out.The full volume was 954.25 ml and the volume in water was 948.81. The difference was 5.44 ml. Even better values were obtained compared to those of the container (5.61 ml) in which only the lateral ribs were formed in this way. It is considered that this is because the bending strength of the corner portion 4 with respect to the vertical surface was improved by forming the vertical rib 5 in the corner portion 4.

The angle of the reinforcing rib can be arbitrarily set in the panel portion 2 of the capacity 1 in the range of 30 ° to 60 ° with respect to the vertical direction,
The larger the angle, the better the water drainage, but the strength decreases, so it is desirable to set it appropriately according to the purpose of use.

Although the vertical ribs 5 are formed in a U-shaped cross section in the above-mentioned embodiment, the present invention is not limited to this example.
It may be formed in a corrugated shape, or may be formed in a large number.

[Effect of device]

According to the present invention, since the panel portion 2 of the container 1 is formed with a number of ribs 3 extending obliquely with respect to the vertical direction thereof,
The water drainage after washing the inside of the container with the sterilizing solution is better than that of the container having the lateral ribs.

Further, since the vertical ribs 5 are formed on the corner portions 4 of the polygonal container 1 along the vertical direction thereof, the strength of the container can be improved.

[Brief description of drawings]

1 is a side view of a container showing an embodiment of the present invention, FIG. 2 is a side view of a rib portion, FIG. 3 is a cross-sectional view, and FIGS. 4 to 6 are side views showing a conventional container. FIG. 7 is a side view of the experimental state. 1 ... Container, 2 ... Panel part, 3 ... Rib, 4 ... Corner part, 5 ... Vertical rib.

Claims (1)

[Scope of utility model registration request] 1. A polygonal container 1 made of synthetic resin is provided with a large number of ribs 3 extending obliquely with respect to a panel portion 2 on a side surface thereof, and a corner portion 4 of the polygonal container 1 is provided with a vertical direction thereof. A container with reinforcing ribs, characterized in that vertical ribs 5 are formed along the edges.