JPS597243Y2 - liquid encapsulation bag - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a liquid-filled bag that can be easily and reliably broken with a slight impact when in use.

In recent years, as the development of various plastic films has progressed, the field of liquid containers that traditionally used glass bottles, ceramics, etc. is rapidly changing to plastic films due to their flexibility, toughness, and freedom of deformation. It is being replaced by bag making.

However, in order to reliably tear the bag and scatter the contents when necessary, simply using plastic film makes it difficult to tear the bag due to its toughness. Liquid containers, such as glass flasks, can be destroyed reliably, but broken pieces remain at the site, posing a great danger to humans.
It was inappropriate.

The inventors of the present invention maintained the characteristics of plastic film, which is inexpensive, can be made into any shape, is convenient to transport, and has a good long-term shelf life, while also being able to reliably tear the bag when necessary.
We have developed a liquid-containing bag that is made of plastic film that allows the contents to scatter and that will never break during storage or transportation.

That is, the present invention is a bag in which a liquid is sealed in a bag formed by a sheet-like material having a portion cut in the thickness direction.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

The sheet material constituting the bag that encloses the liquid is suitably a thermoplastic film, and may be a single layer film or a multilayer laminated film of two or more layers.

In the former case, the fact that a part of the sheet-like material is cut in the thickness direction means that the cut 5 is formed in the entire thickness direction as shown in the cross-sectional view of FIG. 5(1). In the latter case, it means that cuts are formed in at least one layer in the thickness direction.

That is, when using a two-layer laminated heat-sealable plastic film, as shown in the cross-sectional view of FIG. A shaped film (hereinafter simply referred to as cut film A) may be used, or
When using a laminated heat-sealable plastic film with three or more layers, a multi-layer cut film A may be used, and a film B without cuts in at least one layer may be used [Fig. 5 (3)]. , a plurality of layers of the film B without cuts may be used, and the cut film A may be used in at least one layer.

[Figure 5 (4)] The stacking order and number of layers of the cut film A and the non-cut film B can be determined as appropriate depending on the impact force required to break the bag and the degree of scattering of the contents when the bag is broken. It is determined.

Suitable thermoplastic films include polyethylene, polypropylene, polyester, nylon, and polycarbonate films, and these stretched films are preferred in order to increase tensile strength.

Particularly preferred as the laminated film is a combination of a high-strength film with notches and a low-strength heat-sealable film without notches; for example, the former is a biaxially oriented polypropylene, polyethylene, or nylon film; A combination of polyester and ethylene copolymer is preferred.

Further, the thickness of the film is also appropriately determined depending on the intended use.

Although not limited, the cut portion is 10 to 100μ,
Further, the remaining portion (non-cut portion) of the portion where the cut portion exists is about 10 to 100 μm.

Further, the shape of the cut in the thickness direction of the film may be not only a straight line but also a cross shape or a square shape, and the cut shape is not limited to one place, but may be made in several places.

The length of the cut will vary depending on the size of the bag, but if it is too small, the tearing force of the film will be weak even when an impact is applied, so it should be at least 5 mm in a straight line, preferably 20 to 70 m.
m is preferred.

Further, in order to improve the bag breakability, it is preferable to make cuts in a film with high tensile strength and not make cuts in a film with low strength.

Further, the laminated thermoplastic film can be obtained by a melt coextrusion method or a dry or wet lamination method.

Then, three or four sides of the sheet-like material are sealed 1 to form a bag.

A required amount (for example, 0.5 to 10 liters) of liquid 6, such as water or water-based fire extinguishing liquid, is sealed in the bag.

In order to enclose a liquid in the bag, the liquid may be enclosed and then sealed, or the bag may be sealed on all sides to form a bag-like shape, and then the liquid may be injected from a separately provided injection port.

FIG. 1 is a plan view showing an embodiment of the bag used in the liquid-filled bag of the present invention, and FIG. 2 is a sectional view taken along the line XX' in FIG.

In this embodiment, the sheet-like material is made of a two-layer heat-sealable film consisting of an outer film 2 and an inner film 3, and the outer film 2 has a straight cut 5 formed therein.

Three sides are sealed 1, and after the liquid is sealed, the remaining side is also sealed.

3 and 4 show other embodiments of the present invention.

The sheet-like material is a laminated heat-sealable film in which a film B without cuts, a film A with cuts, and a film B without cuts are laminated in this order from the upper layer, and a reinforcing film 7 is stuck on the surface corresponding to the cuts 5. has been done.

The reinforcing film 7 is attached to the bag in order to prevent the bag from breaking during storage or transportation and to preserve the shape more reliably, and is peeled off and removed immediately before use for a useful purpose.

The liquid-containing bag as described above should be kept at all times.

When used for extinguishing fires, when it is useful, if it is placed at any point, the part with the cut will almost certainly break due to an impact above a certain level, and the fire will be extinguished effectively by the scattering of the extinguishing liquid.

As described above, the liquid-containing bag of the present invention can be created by simply making improvements to conventional film bags, so that the bag does not tear during transportation or storage, and when it is used, it can be reliably torn and the contents are scattered. It is a water-filled bag, and if it is filled with liquid, such as water or water-based fire extinguishing liquid, it will be most effective in extinguishing a fire.

In addition, the present invention has been developed by considering the thickness of the film constituting the bag, the shape of the cut, and the length of the cut. By considering the stacking order or the number of stacked films with non-containing films, it is possible to control the impact force required to break the bag and the degree of scattering of the contents when the bag is broken.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the bag of the present invention, and Fig. 2 is a plan view showing an embodiment of the bag of the present invention.
3 is a plan view showing another embodiment; FIG. 4 is a sectional view taken along line Y-Y' in FIG. 3;
1.2 and 3.4 are cross-sectional views showing examples of sheet-like products. A... Film with notches, B... Film without cuts, 1... Seal, 5...
・Cut, 6...Liquid, 7...Reinforcement film.

Claims (4)

[Scope of utility model registration request] (1) A liquid-filled bag characterized in that a liquid is sealed in a bag formed of a sheet-like material with a portion cut in the thickness direction. (2) The liquid-filled bag according to claim 1, wherein the sheet-like material is a single-layer heat-sealable plastic film. (3) The sheet-like material is a multi-layered heat-sealable plastic film, and the other layers other than at least one layer are films with cuts in the thickness direction. Liquid enclosing bag. (4) The sheet-like material is a two-layer laminated heat-sealable plastic film, and one of the outer layer or the inner layer is cut in the thickness direction. Liquid enclosing bag.