JPH036071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a container sac for the purpose of transporting fluids, in particular an outer sac, an inner bag arranged within this outer sac, and at least a filling and a container for a fluid connected to the inner bag. A container sack comprising a discharge device and at least one opening provided in the upper part of the outer sack through which the air present in the space between the outer sack and the inner bag can escape when the container sack is filled.

BACKGROUND ART Conventionally, when transporting liquids such as juice, wine, and petroleum by ship or truck, it has been known to pack the liquids into large containers having a capacity of about 5 to 20 cubic meters. Compared to rigid barrels, such container sacks have the advantage that, when folded, they require very little space during return transport. However, due to its amorphous shape, it is very difficult to clean the inside of the container sac after transportation, so the container sac consists of a strong outer sac and an inner bag that is placed inside this outer sac, and the inner bag is replaced at the end of each transportation. Various experiments have been attempted regarding container bags designed to do this.
In order for such container sacks to be economically advantageous, the production costs of the inner bag must be very low, which means that the inner bag must be made of very thin material.

To fill a container sack consisting of an outer sack and an inner sack, the inner sack is generally first pushed into the outer sack, and then the filling and emptying devices are attached to the opposing openings of the inner sack and the outer sack. The inner bag is then filled with air and finally replaced by the liquid to be transported.

However, through various experiments conducted on this type of container sac, it has been found that the relative movement of the outer and inner bags during filling of the inner bag with liquid or during transportation causes the inner bag to move around the filling and dispensing equipment. It was observed that tearing almost always occurred. In order to avoid these relative movements, the air contained in the space between the outer bag and the inner bag must be removed as completely as possible;
This air removal was accomplished through a small opening in the top of the outer sack. On the other hand, experiments carried out at the applicant's facility have shown that since the inner bag is made of a thinner material which makes the container sack economically advantageous, the air in the intermediate space can be pumped through the air openings in the outer sack. However, it was recognized that the water was not sufficiently discharged from there.

SUMMARY OF THE INVENTION The object of the present invention is therefore to provide an optimum evacuation of the intermediate space between the outer bag and the inner bag by simple means when filling the inner bag with air. For this purpose, the container bag according to the invention is characterized in that at least one of the surfaces delimiting the intermediate space between the outer bag and the inner bag is provided with a ridge extending from the bottom of the container bag to its top. It is characterized in that air can rise from the bottom of the container sac to its top along the . When the inner bag is filled with air, the air in the intermediate space gathers around the projections of the outer and inner bags located at a small distance from each other and rises to the top of the container bag and from there through the air opening. It was observed that channels were formed through which air could escape. Thus, the air contained in the space between the outer bag and the inner bag is evacuated at a very high rate when filling the inner bag with air, so that in the filled state the inner bag covers almost its entire surface. It contacts the outer sack and prevents the inner bag from moving relative to the outer sack during transportation.

In order to remove air as efficiently as possible from the intermediate space between the outer sack and the inner bag, the ridges are preferably arranged at equal intervals along the outer circumference of the container. Alternatively, protrusions may be provided at the corners of the container sac. This is because it has been recognized that air tends to collect at the corners of the container.

Preferably, the ridge extends directly from the bottom of the container sac to the air opening in the outer sac so that the air channel is not blocked.

In a particularly preferred embodiment, the ridges are air permeable. In such a case, the ridges may consist of, for example, a porous material with a perforated surface or an interwoven belt. If the protrusion itself allows air to pass through, an air channel can be secured between the bottom of the container sack and its top even if the inner bag is in close contact with the side surface of the protrusion. The use of wide belts has been found to be particularly advantageous since the inner bag has a large contact surface with the belt and therefore no high line or spot loads occur.

Also, from an economical point of view, the outer sack is not disposable, but is used several times, so the protrusions are
Preferably, it is provided on the inner surface of the outer sac.

A preferred embodiment of the container bag according to the invention includes:
A detailed description will be given below with reference to the accompanying drawings.

The container sac shown in Figure 1 has an outer sac 1 made of a substantially air-impermeable material such as plastic, and an inner sac 1 placed within the outer sac and made of a substantially air-impermeable material such as a plastic membrane. Consists of 2 bugs. The wall thickness of the outer sac is considerably thicker than that of the inner bag, so that the outer sac is not extensible while the inner bag is somewhat extensible. A manhole 3 is provided at one end of the outer sac, through which the inner bag can be inserted into the outer sac before filling and can be removed from the outer sac after it has been emptied. The outer sack and the inner bag are further provided with holes for a filling and discharging device 4, which consists of a hose 5 to which a pipe 6 is connected. The pipe 6 has two flanges 7 at one end, one of which is placed inside the inner bag and the other outside the outer bag. By attaching the filling and emptying device 4 to the container sac, both flanges are pressed together and at the same time the inner bag is locked onto the outer sac. The filling and emptying device 4 further comprises an air removal pipe 8 for evacuating air from the inner bag when it is filled with liquid. At the top of the outer sack there is a region containing a small opening 9 through which the air present in the intermediate space between the outer sack and the inner bag is evacuated before filling.

According to the invention, the outer sack 1 is provided on its inner surface with a number of interwoven belts 10, which extend from the air removal openings 9 to the bottom of the outer sack. Two such belts are shown in Figure 1, one of which extends along one of the long sides of the outer sack.
While the other is located at the corner of the outer sac. A channel is formed between the outer sack 1 and the inner bag 2 on each side of each belt 10, which is indicated by reference numeral 11 in the figures.

The container sack of the present invention is filled as follows. After first inserting the inner bag into the outer bag and connecting it to the filling and emptying device 4, the manhole is closed by bolts. Air is then blown into the inner bag through the hose 5 and pipe 6 so that the inner bag 2 fills the entire interior space of the outer bag 1. Here, the inner bag is positioned in close contact with the inner surface of the outer sack over its entirety. The exception is the region on both sides of each belt 10, in which channels 11 are formed, along which the air can ascend its path from the bottom of the container sack to the air removal opening 9. Due to the construction of the belt itself, air also flows upwardly through the interior of the belt, thus allowing air flow even if the channel 11 is blocked by the inner bag 2.

Bolt spacing is determined by the size of the plug and the material properties of the inner bag. In most cases it is sufficient to provide belts at the corners of the container sack, but in the case of large containers it is preferable to provide belts on the longer sides as well. Also, instead of the belt, various elliptical protuberances or protrusions may be used. It is preferable that these ridges and protrusions allow air to pass through. As a further variation, porous plastics or rubber materials with porous surfaces may also be used. Of course, the ridges must be flexible so that they do not get in the way when folded together with the outer sack. It is also possible to provide protrusions on the outer surface of the inner bag or on both the inner surface of the outer sack and the outer surface of the inner bag, but since the inner bag is intended to be used only once, such an alternative method is not economically advantageous. Furthermore, the filling and draining device 4 can be divided into two parts, in which air is pumped into the inner bag in the manner shown in FIG. 1, while fluid is introduced into the inner bag through another device arranged below. Alternatively, it may be discharged from there. In this case, the term fluid is used to mean not only gases and liquids, but also bulky substances such as, for example, grains.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the filling state of the container sac according to the present invention; Fig. 2 is a view of the wall of the container sac viewed from inside; and Fig. 3 is a diagram showing the container sac along the - line in Fig. 2. It is a sectional view of a wall. 1...Outer bag, 2...Inner bag, 4...
Filling and discharging device, 9...opening, 10...projection (belt).

Claims (1)

[Scope of Claims] 1 An outer sac 1, an inner bag 2 disposed within the outer sac, at least a filling and discharging device 4 for fluid connected to the inner bag 2, and an upper part of the outer sac 1. At least one container is provided, through which the air present in the space between the outer bag 1 and the inner bag 2 can escape when the container bag is filled.
In a container sac for fluid transport consisting of two openings 9, at least one of the surfaces defining the intermediate space between the outer sac 1 and the inner bag 2 has a protrusion 10 extending from the bottom of the container sac to its top. 1. A container rack, characterized in that air can rise from the bottom of the container rack to the top along the protrusion. 2. The container rack according to claim 1, wherein the protrusions 10 are arranged at uniform intervals along the outer periphery of the container rack. 3. The container rack according to claim 1, wherein the protrusion 10 is arranged at a corner of the container rack. 4. A container rack according to any one of claims 1 to 3, characterized in that the protrusion 10 extends from the bottom of the container rack to the air opening 9 of the container rack. 5. The container sac according to any one of claims 1 to 4, wherein the protrusion 10 allows air to pass through. 6. The container sac according to claim 5, wherein the protrusion is made of a porous material having a porous surface. 7. The container sac according to claim 5, wherein the protrusion is comprised of an interwoven belt 10. 8. The container sack according to any one of the above items, wherein the protrusion 10 is arranged on the inner surface of the outer sack 1.