JP2003341640A - Plastic container with reinforcing rib - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a higher buckling strength when a plastic container has the same product weight (product thickness) as that of a conventional product, the same buckling strength as that of a product with no thinning when the product weight is reduced for thinning to enable reduction of a raw material cost by a part of thinning, and reduction of the cost of the whole product when the product weight is reduced for thinning, as cooling time of the molded article is shortened, the molding cycle can be shortened. <P>SOLUTION: Reinforcing ribs are provided at positions where buckling stress concentrates in the plastic container. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic container, and more particularly to a plastic container suitable for stack storage.

[0002]

2. Description of the Related Art Various chemicals, oils, liquids such as detergents,
BACKGROUND ART Various plastic containers have been conventionally developed and used for accommodating granular materials for stock storage, transportation, and use on site. Some of these plastic containers are suitable for stacking several contents in a state of containing the contents and storing them in stock or transporting them by truck.

When a plurality of containers filled with contents are stacked in this way, a considerable weight is applied to the lowermost container. In the case of a rectangular container, most of the load applied to the lowermost container is the corner of the container, that is, the corner, and when overloaded, the buckling deformation occurs first at the corner and This is the weakest point around the corner.

Conventionally, in order to increase the stacking strength (buckling strength) in a rectangular container or the like, in the case of a plastic container, a method such as increasing the weight of a molded product and increasing the general wall thickness has been taken. It was

[0005]

However, when the weight of the molded product is increased as in the conventional method, there is a problem that the raw material cost is increased accordingly. In addition, there is a problem that the thicker the wall, the longer the cooling time, the longer the molding cycle, and the higher the product cost.

An object of the present invention is to provide a plastic container which can solve the above-mentioned conventional problems.

[0007]

According to the present invention, there is provided a plastic container characterized in that a reinforcing rib is provided at a location where buckling stress is concentrated.

According to one embodiment of the present invention, the reinforcing rib is a vertical rib formed at a corner of the container body having a rectangular cross section. According to another embodiment of the present invention, the reinforcing rib is a vertical rib formed around a corner of the container body having a rectangular cross section.

According to yet another embodiment of the present invention,
The cross-sectional shape of the reinforcing rib is a continuous wavy shape. According to yet another embodiment of the present invention, the cross-sectional shape of the reinforcing rib is a single wavy shape.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to the accompanying drawings with regard to the embodiments and examples of the present invention.

FIG. 1 is a perspective view showing an entire plastic container as an embodiment of the present invention. As shown in FIG. 1, the plastic container 1 of this embodiment has a main body formed into a square shape with a synthetic resin material suitable for the contents to be stored. On the upper surface of the main body of the plastic container 1, there are provided a supply / discharge port 2 for contents, a handle 3, and a shift stopper seat 5 for stacking. In the illustrated example, the displacement prevention seat 5 is arranged at a position close to two diagonal corners and has a convex portion. Although not shown in FIG. 1, at the corresponding positions on the bottom surface of the body of the plastic container 1, these 2
When two plastic containers 1 are stacked on top of each other, a convex portion that engages with the convex portion of the shift stopper seat 5 of the lower container to prevent the upper and lower containers from laterally shifting relative to each other is provided. Are formed.

According to the present invention, the main body of the plastic container 1 of this embodiment has each corner portion, that is, each corner 6.
In addition, a reinforcing rib 4 extending vertically from the top surface to the bottom surface is provided. In order to show the cross-sectional shape of the reinforcing rib 4 at each of these corners 6, FIG. 2 shows a partial cross section taken along the line AA of FIG. As shown in FIG. 2, the reinforcing ribs 4 at the respective corners 6 in this embodiment have a corrugated shape having a continuous cross section.

FIG. 3 is a view similar to FIG. 2, showing the cross-sectional shape of the reinforcing ribs provided around the corners of the main body of the plastic container as another embodiment of the present invention. The reinforcing ribs 4 of this embodiment are provided on the periphery 7 of each corner 6 (see FIG. 1), unlike the corners in the embodiment described with reference to FIGS. 1 and 2.

Although a plurality of reinforcing ribs are provided in the above-described embodiments, the present invention is not limited to this, and only one reinforcing rib may be provided as long as sufficient buckling resistance can be obtained. . Further, in the above-described embodiment, the cross-sectional shape of the reinforcing rib is a wavy shape, but the present invention is not limited to this, and any other shape is acceptable as long as sufficient buckling resistance can be obtained. May be

Furthermore, the shape of the main body of the plastic container of the above-described embodiment is a square shape having a square cross section, but the present invention is not limited to this, and the cross section has a shape close to a square. It is also effective when applied to a container having a rectangular shape or a body close to a rectangular shape.

[0016]

EFFECTS OF THE INVENTION By providing reinforcing ribs which are vertical ribs at the corners of the plastic container or around the corners, if the product weight (product thickness) is equal to that of the conventional product, more buckling resistance is obtained. Obtainable.

When the weight of the product is reduced to make the product thinner, it is possible to obtain the same buckling strength as that of the non-thinned product, and the raw material cost can be reduced by the amount of the product made thinner.

When the weight of the product is reduced to reduce the thickness, the cooling time of the molded product can be shortened.
The molding cycle can be shortened, and the cost of the entire product can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire plastic container as an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 3 is a view similar to FIG. 2 showing a cross-sectional shape of a reinforcing rib provided around each corner of a main body of a plastic container as another embodiment of the present invention.

[Explanation of symbols]

1 plastic container 2 supply and discharge port 3 handle 4 Reinforcing rib 5 misalignment seat 6 corners Around 7 corners

Claims (5)

[Claims] 1. A plastic container characterized in that a reinforcing rib is provided at a location where buckling stress is concentrated. 2. The plastic container according to claim 1, wherein the reinforcing rib is a vertical rib formed at a corner of the container body having a rectangular cross section. 3. The plastic container according to claim 1, wherein the reinforcing rib is a vertical rib formed around a corner of the container body having a rectangular cross section. 4. The plastic container according to claim 1, 2 or 3, wherein a cross-sectional shape of the reinforcing rib is a continuous wavy shape. 5. The plastic container according to claim 1, 2 or 3, wherein the cross-sectional shape of the reinforcing rib is a single wavy shape.