JPH044233B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a large container, and more particularly to a large container formed from a flexible material for packaging, transporting, and storing various powder and granular materials.

(Prior Art) Conventionally, large containers for packaging, transporting, or storing various powder products such as industrial chemicals, resins, grains, and agricultural and granular materials have been made using woven fabrics made of stretched tape made of synthetic resin. There are two types of fabrics manufactured from cloth (original fabric) and mainly used as shown in FIGS. 5 and 6. The large container 1 shown in FIG. 5 has four belts 2 that hold the container body 3 and support the bottom 3a, and is the most widely used. On the other hand, the large container 4 shown in FIG. 6 is made by making four flaps in the opening of the bottomed cylindrical container body 5, and folding both ends inward to form a triangular shape. , the upper half of the seventh
Fold the rope inward as shown in the figure and
The hanging part 5 is sewn together to form a hole through which the hanging part 5 is inserted.
a, and is suspended by each loop-shaped rope 6 passed through the insertion hole of the hanging portion 5a. Both of these two types of large containers are highly safe and widely used.

(Problem to be Solved by the Invention) However, the two types of large containers 1 and 4 mentioned above were originally intended for one-time use, but in reality they were used several times. There is. This is because the manufacturing cost of the conventional large containers 1 and 4 mentioned above is relatively high, so it is desirable for the user to have a large container with a simple structure and low manufacturing cost so that it can be disposable. There was a request for the development of

However, it goes without saying that even large containers that are inexpensive to manufacture must have sufficient safety. Therefore, in general, the question is how much strength is required, but as far as the inventors have measured, the method of suddenly stopping while unloading with a forklift or truck has the greatest impact, which is about 4 tons for a 1 ton container. stress is applied. JIS stipulates that the lift must be lifted 30 times with a load equivalent to twice the maximum filling mass, and then held for at least 5 minutes with a load three times the maximum filling mass. Based on these considerations, it is considered that a safety factor that can withstand five times the total weight of the contents is sufficient for domestic cargo handling. The only way to reduce the manufacturing cost of large containers is to utilize the strength of the material of the container itself and sew a belt onto it to suspend it. This is extremely difficult to achieve, and after experimenting with several types of large containers, the results showed that even with various reinforcements, the load was three times greater.
Specifically, assuming that the actual lifting load is 1 ton, the limit was to withstand 3 tons, which is three times the actual lifting load.

By the way, as an attempt to solve this problem, it was proposed that four inverted U-shaped belts were sewn around the upper end of the bottomed cylindrical container body, but this large container did not have enough strength. The original fabric (material) of the container body that passes through the belt sewing position to increase the
A large number of warp threads of nylon yarn are woven into the belt as reinforcement to increase the strength of the raw fabric part of the container body in the downward direction of the belt. However, when this large container is actually loaded with powder and granular materials and lifted, the bottom drops between the vertical areas passing through the belt seam, and stress is concentrated on the bottom seam under the belt, causing the seam to open. In addition to the risk of leakage, this proposal also had the problem of requiring the use of a special raw material.

The purpose of the present invention was to solve the above-mentioned problems, and the purpose of the present invention is to reduce the manufacturing cost so that it can be disposable, provide sufficient strength during lifting, and be highly safe. An object of the present invention is to provide a large container that prevents the occurrence of perforations, etc.

(Means for Solving the Problems) The present invention provides a bottomed cylindrical container body made of a woven fabric made of a stretched synthetic resin tape, and a plurality of hanging portions provided on the circumferential surface of the opening side of the container body. in a large container that can be lifted by passing a rope or belt through each of the hanging parts, each of the hanging parts being composed of two inverted U-shaped or inverted V-shaped synthetic resin belts; It is characterized in that most of both ends are sewn adjacent to the container body so as not to overlap.

(Function) According to the large container of the present invention, most of the ends of each of the two inverted U-shaped or inverted V-shaped belts constituting each hanging portion are arranged independently, that is, adjacently so as not to overlap each other. Since the belt is sewn to the container body, the stress applied to the belt is dispersed over a relatively wide area over the original fabric of the container body, and stress is not concentrated in a specific location, making it able to withstand extremely large loads.

(Example) Hereinafter, the large container of the present invention will be described in more detail with reference to the embodiment shown in the accompanying drawings.

FIG. 1 shows a large container 1 according to an embodiment of the present invention.
0 is shown. This large container 10 includes a bottomed cylindrical container body 11 made of a woven fabric made of a stretched synthetic resin tape, and four hanging portions are provided on the upper peripheral surface of the container body 11, that is, on the opening side peripheral surface. They are provided at equal intervals in the circumferential direction, and each hanging portion is composed of two inverted U-shaped belts 12, 12' made of synthetic resin.
Both ends of these two belts 12, 12' are sewn adjacent to the container body 11 so as not to overlap, and the sewn parts 12a, 12b, 12'
a, 12'b. That is, looking at one set of hanging parts, as shown in FIG.
12'b are arranged adjacent to each other and alternately so as not to overlap. A hanging rope 13 is sequentially passed through each belt 12, 12' of the large container 10 constructed in this way and fastened in a ring shape.
is lifted up.

By the way, the width of one belt 12 is, for example, 100
If mm, the total width of the sewing parts 12a and 12b is twice that, or 200mm, since they are shaped like an inverted U.
Since these two pieces make up one set, the total width of this one set of sewing parts is 400 mm. There are 4 sets of these, so the total width is 1600mm. Sewn parts 12a, 12b, 1 with this whole belt 12, 12
The total width dimension at 2'a and 12'b is the container body 1.
The length is set to be 30% or more of the circumference of 1. That is, the circumferential length of the container body 11 is 3460 mm in this embodiment, and therefore the sewn parts 12a, 12 of all the belts 12, 12' with respect to this circumferential length.
b, 12'a, 12'b total width ratio is approximately 46
%.

When we put 1 ton of contents into this container and tested it with a lifting tester, there was no abnormality even with the impact load of 5 tons, and since the bottom was evenly supported, there was no particular problem with the opening of the seam under the belt. It became clear that the results were very good.

The test was also carried out for a diameter of 1200 mm, but the results were the same; in this case, the inner circumference was 3770 mm, and the proportion of the total width of the belt sewing part was 42%. These so-called flexible containers are used for weights of 500 kg or more, and belts commonly used are 70 mm and 100 mm, so for containers with small allowable weights, even a 70 mm wide belt can be used. The strength is sufficient. In this case, the 70 mm wide belt has a total of 16 sewn parts, so the total width is 1120 mm, and the ratio to the circumference of the 1100 mm diameter container is 32.4%.

What is clear from these experiments is that the container body 1
Lifting belt 12,1 for circumference length of 1
2' sewing parts 12a, 12b, 12'a, 1
If the ratio of the total width dimension in 2'b is 30% or more, sufficient strength will be exhibited against the load taking into account the safety factor.

In this way, the sewn portion 12 of the lifting belts 12, 12' relative to the circumferential length of the container body 11 is
If the proportion of the total width dimension of a, 12b, 12'a, 12'b is 30% or more, the stress applied to the belt, in other words, the sewn portions 12a, 12b, 12'a, of each belt 12, 12'. 12'b is widely dispersed in the original fabric of the container body 11 in accordance with the above-mentioned ratio, so it is thought that the stress concentration at a specific point does not occur and the predetermined strength can be obtained. .

In the embodiment described above, two inverted U-shaped lifting belts 12, 12' constitute one set of hanging parts, and in each set, the sewing part 1 of each belt 12, 12' is
2a, 12b, 12'a, and 12'b were arranged adjacent to each other and alternately so as not to overlap, but as shown in FIG.
Two inverted U-shaped belts 12, 12' may be sewn adjacent to each other in parallel so that their ends do not overlap, or, as shown in FIG. It may also be sewn to the circumferential surface of the container body 11 in the form of a letter.

In each of the above embodiments, both ends of each belt were sewn to the outer peripheral surface of the container body, but one or all of the belts in a set of two were sewn to the cylindrical body and the top plate. It may be inserted into the inside of the container body between the seams and sewn onto the inner circumferential surface.

(Effects of the Invention) As explained above, according to the large container of the present invention, both ends of the two inverted U-shaped or inverted V-shaped belts constituting each hanging part can be connected independently, that is, mutually. By sewing the seams adjacent to the container body without overlapping, the stress is dispersed over a wide range and stress is not concentrated in a specific area, making it possible to obtain the required strength and also prevent the seams at the bottom from opening. Without,
Moreover, since the belt is simply attached to the container body by sewing it onto the upper circumferential surface, the manufacturing cost can be reduced, and it is possible to provide an extremely suitable flexible large container for one-way use.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a large container according to an embodiment of the present invention, and FIG. 2 is an enlarged fragment showing the sewn portion between the lifting belt and the container body in the large container shown in FIG. 1. FIGS. 3 and 4 are fragmentary front views showing an enlarged view of the sewn portion between the lifting belt and the container body in a large container according to another embodiment of the present invention, and FIGS. 6 and 6 are respectively perspective views showing a conventional large container, and FIG. 7 is a partial perspective view showing a lifting rope attachment structure in the conventional large container shown in FIG. 6. 10...Large container, 11...Container body, 12,
12'...Lifting belt, 12a, 12b,
12'a, 12'b...sewing parts.

Claims (1)

[Claims] 1. A cylindrical container body with a bottom made of a woven fabric made of stretched synthetic resin tape, and a plurality of hanging parts provided on the opening side circumferential surface of the container body, and a rope or belt can be passed through each of the hanging parts. In a large container that can be lifted, each of the above-mentioned hanging parts is composed of two inverted U-shaped or inverted V-shaped synthetic resin belts, and the two belts are adjacent to each other so that the majority of both ends of each belt do not overlap. A large container, characterized in that the container is sewn to the container body.