JPS5815394B2 - Liquid transportation method using flexible containers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transporting liquids using flexible containers.

Flexible containers are lightweight and can be folded into a small container when not in use, making them easy to handle, store, and transport, making them ideal for handling powder and granular materials. Widely used.

However, for liquids, it is used exclusively as a temporary storage tank for liquids, and is not used as a container for transportation.

The reason for this is that when a sealed bag-shaped flexible container filled with liquid is transported, sudden changes in acceleration, such as a sudden start, sudden stop, or sharp turn, cause the liquid inside the flexible container to rapidly flow in one direction, causing the container wall to spread. There is a risk of impact and damage to the flexible container, as well as deformation of the flexible container.
This is because the effect of securing the load by hanging the rope is lost, causing the load to collapse, and there is also a risk of overturning due to movement of the center of gravity.

The present inventor researched the relationship between the liquid filling pressure and the strength of the shape of the container when filling a sealed bag-type flexible container with liquid, and found that by filling the liquid with a filling pressure higher than a certain pressure, the liquid filling The inventors discovered that flexible containers are extremely difficult 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 safely transport liquids using a sealed bag-type flexible container.

The gist of the present invention is to apply liquid to a sealed bag-type flexible container at a vertex pressure of 0.02 to 0.3 kg/cm2gauge.
A method of transporting a liquid by means of a flexible container, which is characterized in that the liquid is filled under pressure within the range of 100 to 100 ml, and the liquid-filled flexible container is transported while being secured to a transport means.

In the present invention, apex pressurization refers to the topmost part of the top surface of a flexible container when filling a flexible container with a liquid under pressure so that substantially no air remains inside the bag. The central part where the air vent pipe is attached corresponds to this apex, and it refers to the pressure of the filled liquid at this apex.Generally, flexible containers for liquids are rectangular and have a water pillow-like shape after being filled with liquid. However, the rectangular water pillow shape is also preferred for liquid transportation because it has a large base area and good stability.

In this case, the intersection of the diagonal lines of the rectangle on the upper surface becomes the apex, and the air vent pipe is provided to serve as the measurement position for the apex pressurization.

As liquid is filled into the container while removing internal air from the air vent pipe, the container expands from its disk shape.
It becomes a flat water pillow (if it is used as a tank for storing liquid, filling ends at this level), and when pressure filling is continued, the pressure at the top becomes positive, and the top surface of the container curves upward. The curved surface makes the flexible container solid and difficult to deform, making it suitable for harsh transportation conditions and effective for roping.

Vertex pressure is 0.02-0.3kg/cm2gauge
If it is less than 0.02 kg/cm2, the liquid-filled container may be shaken and deformed, making it unsuitable for transportation, and if it exceeds 0.3 kg/cm2, the tensile stress applied to the container base fabric becomes too strong and the container Because it is necessary to set the strength of the base fabric with a sufficient safety factor in mind,
The bag base fabric is thick, hard, and heavy, making it difficult to handle, roll up and transport when empty.

On the other hand, the rigidity required for transportation of a liquid-filled flexible container can be sufficiently obtained at 0.3 kg/cm2 or less.

Next, as a method of determining the apex pressurization during filling, a pressure gauge may be attached to the base of the air vent pipe at the apex, the pressure may be measured while filling, and the filling may be stopped when a predetermined pressure is reached.
Or it can also serve as an air vent pipe.

Attach a transparent tube vertically through the valve, and let the air escape.
When the liquid rises in the transparent tube and reaches a predetermined liquid pressure height from the apex base considering the liquid ratio type, the desired apex pressurization pressure is reached, so all you need to do is close the valve and stop the liquid injection. It is expedient to remove the tubes etc. and transport them later.

FIG. 1 shows a side view of a liquid-filled container obtained by the method of the present invention from the long side of the rectangle, and FIG. 2 shows a side view of the liquid-filled container as a conventional stationary tank.

As you can see from the comparison of this figure, the conventional static. In a stationary tank, the upper surface is a nearly horizontal plane, but in the method of the present invention, the upper surface curves upward in an arcuate shape, maintains a strong overall shape, and can be secured to the loaded vehicle body with a rope. It is performed reliably and does not deform even when sudden changes in acceleration occur.

The flexible container used in the method of the present invention needs to be a pressure-resistant flexible container that regularly uses the above-mentioned vertex pressure. For example, a stretched fabric made of nylon canvas treated with chloroprene rubber is used, and in addition to 1-ply quip, 2-ply Equivalent multi-ply types are also used.

Further, although the air vent pipe at the apex may also be used as a liquid injection and discharge port, it is preferable from the viewpoint of operation to provide a liquid injection and discharge port or an injection and discharge port on the side surface.

Further, the planar shape of the container is not particularly specified, such as square, circular, oval, etc., but a rectangular container is preferable from the viewpoint of manufacturing since it has a small base area and is stable.

The transportation means in the present invention include freight cars, railway vehicles,
During transportation, including ships and aircraft, it is necessary that the loading floor be approximately level and have no exposed protrusions.

According to the method of the present invention, an empty bag container is spread out on a truck, railway vehicle, ship, or aircraft, filled with liquid, roped, and secured to a loading platform, transported without shifting, and the container is unloaded. After draining the liquid, the container can be folded up and removed from the vehicle body, etc., without any problems.

According to the method of the present invention, liquids can be safely transported using ordinary trucks, railway vehicles, etc., without using special vehicles such as tank trucks, and round-trip transportation is possible, as well as one-way transportation. Empty containers are lightweight and can be folded into a small volume, making them easy to store and return, resulting in significant savings in transportation costs, which is especially advantageous for spot transportation.

In addition, filling and folding an empty container are easy, reducing labor costs, and the weight of the container itself is much lighter than that of a steel container, increasing the loading capacity.

In addition, the flexible container can be used by taking advantage of its features, which can be easily made to have excellent durability and chemical resistance, and are easy to maintain such as cleaning.

Furthermore, the filled liquid does not come into contact with air, which has the advantage of preventing deterioration due to oxidation and generation of coagulated substances.

Hereinafter, the present invention will be further explained with reference to Examples.

Example 1 When flattened, a transparent pipe was inserted into a rectangular water pillow-shaped flexible container measuring 4 m long and 2 m wide, through a valve 4, on the diagonal intersection of the upper surface, as shown in the side view from the long side during filling. 5 was attached, and a pipe liquid drain valve 6 was attached to the lower part of the transparent pipe 5.

Valve 4 is used for injecting and discharging liquid and venting air from the container.

Further, a liquid filling hose 7 was connected via the liquid injection valve 3 on the side, and water was injected.

After the air was released from the transparent pipe, the height d from the top of the container to the water surface in the transparent pipe 5, the height al from the bottom of the container to the top, and the amount of water filled in the container were measured.

In each case, the tensile stress NY exerted on the base fabric on the vertical center line passing through the container apex and the tensile stress Nφ exerted on the base fabric on the horizontal center line passing through the apex.
was calculated.

The results are shown in Table 1. As Table 1 shows, d=0.
In case 01, the tensile stress is small and the rigidity of the container is insufficient.

In addition, when the value of d is 0.49 or 2.00, the tensile stress becomes extremely large, requiring a thick and strong base fabric, which is impractical, and d=
At 0.06° and 0.18, the tensile stress was also appropriate and the filled container showed good rigidity.

Example 2 Synthetic rubber latex (specific gravity approximately 1.0) was injected through the injection valve 3 using the flexible container used in Example 1, and the liquid height from the top of the transparent pipe reached 1.0 m. (corresponding to a vertex pressure of 0.1 kg/cm2gauge), the valve 4 was closed, the latex in the transparent pipe was extracted from the valve 6, and the transparent pipe was removed.

The above operations were carried out on the truck bed, and then four ropes were hung horizontally and in parallel through the side plate of the truck, and then two ropes were hung diagonally across each rope and the ropes were secured to the truck bed.

The horizontal rope was hung through a belt loop provided on the surface of the container, but good rope hooking was possible even without the belt loop.

The truck started, stopped suddenly, and made sharp turns several dozen times, but no abnormality was found in the tension or position of the rope.

Furthermore, a truck loaded with latex-filled containers in exactly the same manner was driven for approximately 1,000 km on a general national highway under the supervision of following vehicles, but no damage was observed and the truck was safely transported.

[Brief explanation of the drawing]

FIG. 1 is a front view from the long side of a liquid-filled flexible container according to the method of the present invention, FIG. 2 is a front view of a conventional stationary tank type liquid-filled flexible container, and FIG. 3 is a front view of a liquid-filled flexible container according to the method of the present invention. A front view of the liquid-filled container is shown. 1...Flexible container, 2...
Air vent port, 3...Injection valve, 4...
...Injection/discharge/air vent valve, 5...Transparent pipe, 6...Liquid drain valve, 7...
Liquid injection hose, d... Height from top to liquid level,
a: Height from the bottom of the container to the top.

Claims (1)

[Claims] 1.Pour the liquid into a sealed bag-shaped flexible container with 0 pressure at the top.
．． A method for transporting liquid using a flexible container, characterized in that the liquid is filled under pressure within the range of 0.02 to 0.3 kg/cm2 gauge, and the liquid-filled flexible container is transported by being tied to a transport means.