JP6880593B2 - Independent pouch - Google Patents

Description

The present invention relates to a pouch made of a synthetic resin film that enables small amounts of fluid contents such as soy sauce, sauce, and beverage to be consumed, and in particular, is self-supporting as a double structure of an inner bag and an outer bag. Regarding pouches.

Conventionally, rigid containers such as glass bottles and plastic bottles have been used as containers for contents that are not consumed all at once but are consumed little by little in fluid foods. In recent years, from the viewpoint of facilitating disposal, a pouch made of a synthetic resin film that can be folded flat after use to reduce the volume has been desired. However, in a general standing pouch, the bottom film part expands three-dimensionally to maintain independence when the contents are sufficiently contained, but the independence is lost when the contents are small, so that the independence is assisted. A separate aid was needed to do this.

As a technology to maintain the independence of the pouch itself without using auxiliary tools, a content storage part as an inner bag is provided inside the outer bag equipped with a bottom gusset, and air etc. is provided in the space between the inner bag and the outer bag. A double self-supporting bag in which the outer bag is inflated by filling with the gas of the above is also known (see Patent Document 1). However, this double self-supporting bag has a structure in which the bag is opened and the contents are taken out at a time at the time of use for the purpose of protecting the contents vulnerable to impact. That is, after opening the package, the filled gas is released and the independence is lost. Therefore, it cannot be used as it is as a container for taking out the fluid contents in several parts.

Therefore, in order to eliminate such a drawback, the applicant has proposed a self-supporting pouch in which a bent portion is provided on the side seal portion of the outer bag (see Patent Document 2). However, since this self-supporting pouch must be processed to provide a bent portion, there is still room for improvement.

In addition, when gas is sealed in the space between the inner bag and the outer bag, the sealing process must be performed so that a sealed space is formed between the inner bag and the outer bag while putting the gas in the space. There is also a problem that it is difficult to control the amount of gas enclosed in this space.

Japanese Unexamined Patent Publication No. 2010-275018 Japanese Unexamined Patent Publication No. 2015-6891

An object of the present invention is to provide a self-supporting pouch that can easily control the amount of gas that fills the sealed space between the inner bag and the outer bag and can stand on its own even if the contents are reduced.

The present invention employs the following means to solve the above problems.

That is, the self-supporting pouch of the present invention is
An inner bag made of synthetic resin film filled with fluid contents,
An outer bag made of synthetic resin film in which the inner bag is stored, and an outer bag
A spout that can be resealed and attached to the inner bag,
With
A closed space is formed between the inner bag and the outer bag.
A film in which at least a part of the inner bag and the outer bag is kneaded with a second reactant that generates a gas in the enclosed space by a reaction with a first reactant existing in the enclosed space. It is characterized in that it is composed of.

According to the present invention, gas is generated by the reaction between the first reaction product existing in the closed space and the second reaction product kneaded into the film, and the inside of the closed space between the inner bag and the outer bag is generated. Filled with gas. Therefore, the amount of gas that fills the enclosed space can be controlled by the size of the film in which the second reactant is kneaded and the amount of the second reactant that is kneaded into the film. Therefore, it is easy to control the amount of gas that fills the sealed space between the inner bag and the outer bag. In addition, gas increases over time in the sealed space between the inner bag and the outer bag. As a result, even if the contents are reduced, the self-supporting pouch can be maintained in a self-supporting state.

The first reaction product is preferably water, and the second reaction product is preferably a metal powder that generates hydrogen by reaction with water. Further, it is also preferable that the first reaction product is water and the second reaction product is a powder of a compound that generates carbon dioxide by reaction with water.

As described above, according to the present invention, it is easy to control the amount of gas that fills the sealed space between the inner bag and the outer bag, and it is possible to make it self-supporting even if the contents are reduced.

FIG. 1 is a front view of a self-supporting pouch according to an embodiment of the present invention. FIG. 2 is a side view of the self-supporting pouch according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a self-supporting pouch according to an embodiment of the present invention. FIG. 4 is an enlarged cross-sectional view of the self-supporting pouch according to the embodiment of the present invention. FIG. 5 is a partially enlarged view of an external view showing a modified example of the inner bag of the self-supporting pouch according to the embodiment of the present invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail exemplarily with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to those, unless otherwise specified. ..

(Embodiment)
The self-supporting pouch according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a front view of a self-supporting pouch according to an embodiment of the present invention. FIG. 2 is a side view of the self-supporting pouch according to the embodiment of the present invention. In FIGS. 1 and 2, in order to make the internal structure easy to understand, a part (dotted line portion) is shown in a perspective view. FIG. 3 is a schematic cross-sectional view of the self-supporting pouch according to the embodiment of the present invention, and is a cross-sectional view taken along the line AA in FIG. FIG. 4 is an enlarged cross-sectional view of the self-supporting pouch according to the embodiment of the present invention, and is an enlarged cross-sectional view of the X portion in FIG. FIG. 5 is a partially enlarged view of an external view showing a modified example of the inner bag of the self-supporting pouch according to the embodiment of the present invention.

<Overall composition of self-supporting pouch>
In particular, with reference to FIGS. 1 to 3, the overall configuration of the self-supporting pouch 10 according to the present embodiment will be described. The self-supporting pouch 10 according to the present embodiment includes an inner bag 200 made of a synthetic resin film, an outer bag 100 made of a synthetic resin film in which the inner bag 200 is housed, and a resealable spout portion 300. .. The inner bag 200 is filled with a fluid content C such as soy sauce, sauce, and beverage. Further, the spout portion 300 is attached to the inner bag 200. In addition, the spout portion 300 is
It is composed of a spout 310 and a screw cap 320 that opens and closes the spout 310. A closed space S is formed between the inner bag 200 and the outer bag 100.

<Inner bag>
In particular, the inner bag 200 will be described in more detail with reference to FIGS. 1 to 3. The inner bag 200 according to the present embodiment is a so-called flat pouch. That is, the inner bag 200 includes a pair of front and back films 200A and 200B. In these pairs of films 200A and 200B, the left and right sides and the bottom three sides are heat-sealed by the side seal portion 210 and the bottom seal portion 220. Further, the spout 310 of the spout portion 300 is heat-sealed between the openings on the upper side to form the top seal portion 230.

<Outer bag>
In particular, the outer bag 100 will be described in more detail with reference to FIGS. 1 to 3. The outer bag 100 according to the present embodiment is a so-called standing pouch. The outer bag 100 is composed of three films, a front film 100A, a rear film 100B, and a bottom film 100C. The front film 100A and the rear film 100B have a quadrangular shape, and the left and right side portions that are overlapped are heat-sealed by the side seal portions 110. Further, the bottom film 100C is sandwiched between the lower ends of the front film 100A and the rear film 100B in a folded state at the lower ends of the front film 100A and the rear film 100B, and is heat-sealed by the bottom seal portion 120.

The upper end portion of the outer bag 100 is heat-sealed so as to sandwich the top seal portion 230 of the inner bag 200 to form the top seal portion 130, and the gap between the inner bag 200 and the outer bag 100 is sealed. .. As a result, a closed space S is formed between the inner bag 200 and the outer bag 100. Then, when the closed space S is filled with gas, the front film 100A and the rear film 100B swell back and forth, the bottom film 100C opens back and forth in a boat shape, and the lower end portion of the bottom seal portion 120 touches the ground. , The self-reliant state is maintained.

<Manufacturing process of self-supporting pouch>
The manufacturing process of the self-supporting pouch 10 according to the present embodiment will be briefly described. Regarding the inner bag 200, a side seal portion 210, a bottom seal portion 220, and a top seal portion 230 are formed by heat sealing on a pair of front and back films 200A and 200B. The top seal portion 230 is formed after the side seal portion 210 and the bottom seal portion 220 are formed. When forming the top seal portion 230, the top seal portion 230 is formed by heat-sealing with the spout 310 sandwiched in the upper opening of the inner bag 200 whose upper side opens. However, before the self-supporting pouch 10 is shipped, a part of the top seal portion 230 that is not sealed is provided, and after the content C is filled from this portion, the top is completely top-sealed by heat sealing. The seal portion 230 is formed.

Regarding the outer bag 100, the side seal portion 110, the bottom seal portion 120, and the top seal portion 130 are formed by heat sealing the three films of the front film 100A, the rear film 100B, and the bottom film 100C. .. The top seal portion 130 is formed after the side seal portion 110 and the bottom seal portion 120 are formed. That is, a state in which the inner bag 200 to which the spout portion 300 is attached is housed in the outer bag 100 on which the side seal portion 110 and the bottom seal portion 120 are formed, and the top seal portion 230 of the inner bag 200 is sandwiched. Then, the top seal portion 130 of the outer bag 100 is formed.

Here, when filling the space between the inner bag and the outer bag with gas, a portion that is not sealed is conventionally provided in a part of the top seal portion of the outer bag, and the portion is filled with gas from this portion. Was sealed. On the other hand, in the self-supporting pouch 10 according to the present embodiment, the outer bag 10
It is not necessary to provide an unsealed portion on a part of the top seal portion 130 of 0. That is, in the present embodiment, the step of filling the gas from the unsealed portion is unnecessary. Hereinafter, a configuration in which the sealed space S between the inner bag 200 and the outer bag 100 can be filled with gas will be described in detail even though such a step is unnecessary.

<Gas in a closed space>
In the self-supporting pouch 10 according to the present embodiment, a closed space S is formed between the inner bag 200 and the outer bag 100 in a state where water W as a first reaction product is contained. That is, in the above manufacturing process, the top seal portion 130 of the outer bag 100 is formed after the space between the inner bag 200 and the outer bag 100 is filled with water.

As shown in FIG. 4, the front film 100A and the rear film 100B constituting the outer bag 100 according to the present embodiment are composed of a two-layer structure of an outer surface material 100AA and an inner surface material 100AB. Although the front film 100A is shown in FIG. 4, the rear film 100B has the same configuration. The outer surface material 100AA is made of a barrier film capable of suppressing the permeation of gas. On the other hand, the inner surface material 100AB is composed of a resin film in which iron powder F as a second reaction product is kneaded.

By the self-supporting pouch 10 configured as described above, the moisture existing in the closed space S reacts with the iron powder F contained in the inner surface material 100AB of the outer bag 100, so that hydrogen gas is generated over time. Occurs little by little. As a result, the enclosed space S is gradually filled with hydrogen gas.

<Advantages of the self-supporting pouch according to this embodiment>
According to the self-supporting pouch 10 according to the present embodiment, the gases filling the closed space S are the first reaction product (moisture) existing in the closed space S and the second reaction product (moisture) kneaded into the inner surface material 100AB. Obtained by reaction with iron powder F). Therefore, unlike the conventional case, a part of the top seal portion of the outer bag is provided with an unsealed portion, and it is not necessary to seal the portion while filling gas from this portion. Further, the amount of gas filling the closed space S can be controlled by the size of the film into which the iron powder F is kneaded and the amount of the iron powder F kneaded into the film. The relationship between the elapsed time and the amount of gas in the closed space S can also be controlled. Therefore, it is easy to control the amount of gas enclosed in the closed space S between the inner bag 200 and the outer bag 100. Further, gas increases with time in the closed space S between the inner bag 200 and the outer bag 100. As a result, even if the content C is reduced, the self-supporting pouch 10 can be maintained in a self-supporting state. It is also possible to maintain a state in which the inside of the closed space S is positively pressured. Therefore, the self-supporting posture of the self-supporting pouch 10 can be improved. In addition, since cushioning can be provided, resistance to dropping can be provided.

<Others>
In the above embodiment, the case where the inner surface material of the film constituting the outer bag 100 is composed of a film in which iron powder F as a second reaction product is kneaded is shown. However, in the present invention, for the film in which the second reaction product is kneaded, at least a part of the inner bag 200 and the outer bag 100 may be composed of the film. Therefore, for example, it is also possible to use the resin film having the above-mentioned two-layer structure only for the front film 100A and to use the film having only the barrier film for the rear film 100B. Further, the front film 100A and the rear film 100B may have a plurality of layers having three or more layers, and an intermediate layer having a film in which the second reactant is kneaded may be adopted. In this case, a film through which the first reaction product permeates may be used for the film inside the intermediate layer. Further, it is also possible to adopt a structure in which the film 200AX in which the second reactant is kneaded as the outer surface material is attached to a part of the film 200A constituting the inner bag 200 (see FIG. 5). Note that FIG. 5 shows a part of an external view of the inner bag 200 as viewed from the outside. Further, similarly to the film constituting the outer bag 100, the film constituting the inner bag 200 may have a multilayer structure of three or more layers. Of course, a configuration may be adopted in which the second reactant is present in both the outer bag 100 and the inner bag 200.

Further, in the above embodiment, the case where the first reaction product is water and the second reaction product is iron powder is shown. However, in the present invention, various known techniques can be applied to the first reaction product and the second reaction product as long as gas is generated by the reaction. For example, when the first reaction product is water, hydrogen gas can be generated even when magnesium or aluminum is used as the second reaction product. Further, if baking soda or calcium carbonate is used as the second reaction product, carbon dioxide gas can be generated.

Further, in the above embodiment, the configuration in the case where water as the first reaction product is put in the closed space S in advance is shown. However, in the present invention, when a substance that becomes a first reaction product such as water exudes from the content C filled in the inner bag 200 into the closed space S over time, the substance is used. It can also be used as the first reactant. In this case, it is not necessary to put the first reactant in the closed space S in advance.

Further, in the above embodiment, the case where the resealable spout portion 300 is composed of the spout 310 and the screw cap 320 is shown. However, in the present invention, various known techniques such as a zipper can be applied as the resealable spout portion.

10 Free-standing pouch 100 Outer bag 100A Front film 100AA Outer surface material 100AB Inner surface material 100B Rear surface film 100C Bottom film 110 Side seal part 120 Bottom seal part 130 Top seal part 200 Inner bag 200A, 200B, 200AX Film 210 Side seal part 220 Bottom seal part 230 Top seal part 300 Spout part 310 Spout 320 Cap C Contents F Iron powder S Sealed space W Moisture

Claims (3)

An inner bag made of synthetic resin film filled with fluid contents,
An outer bag made of synthetic resin film in which the inner bag is stored, and an outer bag
A spout that can be resealed and attached to the inner bag,
With
A closed space is formed between the inner bag and the outer bag.
A film in which at least a part of the inner bag and the outer bag is kneaded with a second reactant that generates a gas in the enclosed space by a reaction with a first reactant existing in the enclosed space. A self-supporting pouch characterized by being composed of. The self-supporting pouch according to claim 1, wherein the first reaction product is water, and the second reaction product is a metal powder that generates hydrogen by reaction with water. The self-supporting pouch according to claim 1, wherein the first reaction product is water, and the second reaction product is a powder of a compound that generates carbon dioxide by reaction with water.

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