JPS5815393B2 - How to expand the inner bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of spreading an inner bag closely against the inner wall surface of a container.

Conventionally, when using storage containers and transportation containers for multiple purposes,
The inside of the container had to be cleaned and dried each time the contents changed, but these tasks required a great deal of cost and labor in proportion to the size of the container, and also required workers to clean and dry the inside of the container. There were many cases where work had to be done inside the facility, which was extremely dangerous.

For this reason, it has been proposed to compensate for the above-mentioned drawbacks by using a flexible inner bag.

However, since storage and transportation containers are generally in a closed or semi-closed state, it is extremely difficult to spread the inner bag uniformly and tightly over the inner wall surface of the container.

In other words, in an open type, it can be easily expanded by filling the inner bag with contents, but in a closed type, part of the inner bag comes into contact with the inner wall surface of the container during expansion. This contact area often does not move until the expansion is completed, resulting in uneven expansion, resulting in areas that do not come into close contact with the inner wall surface, which not only reduces the storage capacity, but also causes the contents to shake during transportation. Due to the movement, stress is concentrated on parts that are not in close contact with the inner wall surface, making the inner bag more likely to be damaged.

Methods to spread the inner bag uniformly and closely include stretching the corners and sides of the inner bag with ropes, making the entire inner bag into an accordion shape, wrapping it in a net, and adding rails or bridges. However, all of them are impractical as they require complicated operations and require extensive modification of the container.

The present inventors fully recognized the current situation and completed the present invention as a result of intensive studies to develop a method with excellent operability without major modification.

The gist of the present invention is that when the inner bag body is stretched closely against the inner wall surface of the container, an air mat portion made of an appropriately shaped air tube body is attached to at least a part of the outer surface of the inner bag body. The present invention provides a method for expanding an inner bag, which uses an inner bag and expands by combining pressure applied to the air mat section and pressurization of the inner bag.

The present invention will be explained in detail below with reference to the drawings.

1 and 2 are a partial plan view and a cross-sectional view, respectively, showing an embodiment of the inner bag body used in the present invention, in which an air mat portion 2 composed of an air tube body 1 is attached to an inner bag body 3. It is attached.

Here, the size, shape, number, and mounting direction of the air tube body 1, as well as the number and attached position of the air mat portion 2, may be appropriately selected depending on the size, shape, etc. of the container to be used, and are not particularly limited. However, if the shape of the air tube body 1 is cylindrical (tubular), it is preferable because the air tube body 1 comes closer to the inner wall surface of the container. d) is also preferable because the same effect can be obtained.

Furthermore, by configuring the air mat section with one large air tube body at the center of the ridgeline or surface of the inner bag body, it is also possible to reinforce the inner bag body when pressurizing the air tube body.

At least one conduit 4 for pressurizing and depressurizing the air tube body is attached to the crimping portion of the air tube body.

The conduit is led out of the container, and a desired pressure is applied or reduced by a pressure regulator (not shown).

The pressurized medium is usually air, but in some cases hydrogen,
Gas such as argon may be fanned.

On the other hand, in order to prevent the air tube body from collapsing when the pressure is reduced, it is preferable to fill the air tube body with a porous substance or the like.

The material of the air tube body is preferably softer and thinner than that of the inner bag body.

Further, the outside of the air tube body may be protected with various fabrics, nets, etc.

Various methods can be used to attach the air mat portion to the inner bag body. For example, the outer surface of the inner bag body may be made of a sheet with an uneven corrugated shape, or sheets that are overlapped and sewn to form an uneven corrugated shape. It may be attached by adhesion or the like.

In order to spread the inner bag having such a structure uniformly and closely against the inner wall surface of the container, for example, first pressurize a part or all of the air mat section, or at the same time, pressurize the inner bag itself. Expand the inner bag by applying pressure.

As the inner bag is filled with contents, the air mat portions are sequentially depressurized from below to uniformly bring the inner bag into close contact with the inner wall surface of the container.

When inflating the air mat section, it is preferable to apply pressure sequentially from the air mat section attached to the bottom of the inner bag body to the air mat section attached above, as this allows smooth expansion.

In addition, when discharging the contents, at the same time as discharging the contents, the air mat section is pressurized from above to expand the space created by discharging the inner bag and maintain the shape of the inner bag. A method for discharging the contents may be adopted as appropriate.

After the contents are discharged, the inner bag may be folded and stored by applying internal pressure to the air mat section.

As described above, according to the present invention, the inner bag can be spread evenly and closely against the inner wall surface of the container, and the inner bag can be completely spread even when the amount of contents filled is less than the capacity of the container. Since it is possible to keep the inner bag in a stretched state, it can be transported stably without stress being concentrated on the inner bag due to the shaking of the contents during transport, and its value is extremely high. It's thick.

[Brief explanation of the drawing]

1 and 2 are a partial plan view and a sectional view, respectively, of the inner bag body used in the present invention, and 1 is an air tube body, 2
3 is an air mat part, and 3 is an inner bag body.

Claims (1)

[Claims] 1. When the inner bag body is spread closely against the inner wall surface of the container,
Using an inner bag body having an air mat part made of an appropriately shaped air tube body attached to at least a part of the outer surface of the inner bag body, pressurization and depressurization of the air mat part and pressurization of the inner bag body are performed. A method for expanding an inner bag body characterized by expanding the inner bag body in combination. 2. The method for expanding an inner bag body according to claim 1, wherein the air tube body has a circular shape. 3. The method for expanding an inner bag body according to claim 1, wherein the air tube body is filled with a porous substance or the like. 4. A method for expanding an inner bag according to claim 1, characterized in that the air mat portion is pressurized sequentially from below or the inner bag is pressurized simultaneously.