JPS587553B2 - Liquid transportation method using flexible containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transporting liquids such as surfactants, latexes, flocculants, domestic and agricultural water, etc. using flexible containers.

Flexible containers are lightweight and can be folded into a small volume when empty, making them easy to handle, store, and transport, so they are widely used for storing and transporting powder and granules.

However, for liquids, they are only used as temporary fixed storage tanks for liquids, and are not used for transportation.

The reason for this is that due to sudden changes in acceleration due to sudden starts and stops during transportation, and changes in transportation posture due to sharp curves, the liquid filled inside the container may suddenly flow in one direction, causing the container to wall. These include damage to the fabric due to impact, the deformation of the flexible container, which causes the lashing belt that runs around its outer circumference to loosen and lose its securing effect, and the risk of capsizing due to shifting of the center of gravity. It will be done.

The present inventor studied the relationship between the pressure of the liquid filled in a sealed bag-type flexible container and the strength of the shape and tension of the container during transport, and by maintaining the liquid pressure within the required range, The inventors discovered that liquid-filled flexible containers are less likely to deform and can be handled like solid objects, leading to the completion of the present invention.

An object of the present invention is to provide a transportation method that allows liquid to be safely transported using a sealed bag-type flexible container.

The means adopted to achieve this objective was to tighten the lashing belt that was placed around the outer circumference of the sealed bag-shaped flexible container, thereby allowing the liquid pressurized and filled inside the container to reach a zero level.
Apply pressure to 0.02 to 0.20 kg/cm2 and bring the peak pressure to 0.
03 to 0.23 kg/cm2 gauge pressure.

Here, the peak pressure refers to the pressure at the top inside the flexible container when the liquid filled under pressure is pressurized by tightening the lashing belt so that no air remains inside the flexible container.

Hereinafter, an embodiment of this sprouting will be described based on the accompanying drawings.

As a means of transporting the flexible container, a freight vehicle, a road vehicle, a ship, an aircraft, etc. can be employed, and here, a freight vehicle is shown.

As shown in FIG. 1, a protective sheet 2 is laid out on the loading platform 1 of a truck, and a sealed bag-shaped flexible container 3 is placed on top of the protective sheet 2. It has been folded back to

The flexible container 3 is provided with an inlet/outlet 4 on a part of its outer periphery, and an air vent pipe 5 is connected to the center of the top wall.

This container 3 is placed on the protective sheet 2 in an expanded state, and a plurality of lashing belts 6 are arranged in parallel in the vertical and horizontal directions on the upper surface thereof.

The lashing belt 6 is configured such that the tightening belt part 9 is engaged with a fastener 8 attached to the end of the fixed belt part 7, and the tightening belt part 9 is tightened by operating the fastener 8. I have to.

Hooks 10 are attached to the ends of the fixed side belt section 7 and the tightening side belt section 9, and these hooks 10 can be secured to mooring fittings 11 provided on the outer periphery of the loading platform 1. .

In the state shown in Fig. 1, a liquid supply hose is connected to the inlet/outlet 4, and the supply/discharge valve 1 attached to the inlet/outlet 4 is connected to the inlet/outlet 4.
After the container 2 is opened, the inside of the container 3 is filled with liquid under pressure.

In this case, the exhaust valve 13 attached to the air vent pipe 5 is left open so that the air is vented by pressurized filling of the liquid.

By pressurizing and filling the liquid while removing air from the air vent pipe 5, the container 3 expands from its flat state and deforms into a water pillow shape.Furthermore, pressurized filling is continued to reduce the liquid pressure at the top of the container 3. When a positive pressure is applied, the top wall of the container 3 is bent.

When the amount of liquid filled reaches a set amount, such as by measuring the liquid pressure at the top of the container 3, the supply/discharge valve 12 is closed, the hose is removed, and a blind cap is attached to the inlet/discharge port 4, if necessary.

After filling the liquid under pressure, the hook 10 at the end of the lashing belt 6 is hooked onto the mooring fitting 11, and the lashing belt 6 is tightened by operating the fastening fitting 8 to reduce the liquid inside the container 3 to zero. 0 2
~0. Pressure is increased to 20 kg/cm2, and the peak pressure is set as the set pressure.

This set pressure is preferably in the range of 0.03 to 0.23 kg/cm2 gauge pressure, and if the pressure is within this range, a solid container that is difficult to deform can be obtained, and O- 03 k
If the pressure is less than g/cm2, the container 3 may be shaken and deformed, making it unsuitable for transportation.

Moreover, if it exceeds 0.23 kg/cm2, the tensile stress applied to the base fabric of the container 3 becomes high, and if it is designed to withstand this stress with a sufficient safety factor, the base fabric of the container will be thick, hard, and heavy. The bag also turns into a dog, making it difficult to handle, fold when empty, and transport.

The peak pressure of the liquid can be measured by attaching a pressure gauge to the air vent tube 5, or by connecting a transparent tube 14 to the air vent tube 5 and standing it up as shown by the chain line in FIG. It is possible to adopt a method of measuring the height of the liquid rising inside the container.

Note that, as shown in FIG.
By arranging the fastener 8 at the end of the flexible container 3 on the other side of the loading platform 1, the entire flexible container 3 can be uniformly pressurized by tightening the lashing belt 6a.

A major feature of the liquid transport method of the present invention is that the internal pressure is increased by securing a flexible container that has been filled with liquid in advance.

The flexible container 3 used in the method of this invention is
It is necessary to use a pressure-resistant flexible container that can maintain the above-mentioned peak pressure.For example, a synthetic fiber woven fabric treated with synthetic rubber is used, and in addition to the 1-ply type, there are also multi-ply types such as 2-ply type. used.

Further, the planar shape of the container 3 can be any shape such as square, circular, oval, etc., but a rectangular planar shape has a large bottom area, good stability, and is preferable from the viewpoint of manufacturing.

As described above, according to the present invention, the liquid filled inside the flexible container is pressurized by 0.02 to 0.20 kg/cm2 by tightening the lashing belt, and the peak pressure of the liquid is increased to 0.03 to 0. ．． Since the pressure is 23 kg/cm2 gauge, a solid container that does not easily deform can be obtained, and liquids can be safely transported using ordinary trucks, railway vehicles, etc., without using special wheels such as tank trucks. can.

In addition, after draining the internal liquid, the empty container can be folded into a small volume and is lightweight, making it easy to store and store.
Return shipping is easy, and different types of products can be transported back and forth in the same vehicle, and collection costs can be significantly reduced.

Furthermore, since the container itself is lighter than a steel container, it is possible to significantly increase the loading capacity, and since it is a sealed type, contact with air is prevented from filling to emptying. It is possible to prevent deterioration due to oxidation, generation of coagulated substances, etc., and can be effective in maintaining quality.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the apparatus for carrying out the method according to the present invention, FIG. 2 is a plan view of the same flexible container filled with liquid and secured, and FIG. 3 is a side view of FIG. 2; 3...Flexible container, 6...Lashing helt.

Claims (1)

[Claims] 1. The liquid filled under pressure inside a sealed bag-shaped flexible container is pressurized by tightening a lashing belt that is stretched around the outer circumference of the container, and the peak pressure is increased to 0.03-0.
A liquid transportation method using a flexible container, characterized in that the liquid is transported at a pressure of 23 kg/cm2 gauge.