JP7099167B2 - Degassing bag - Google Patents

Description

The present invention relates to a degassing bag capable of degassing gas generated from the contents.

Patent Document 1 discloses a conventional degassing bag that degass a gas such as carbon dioxide generated from the contents of coffee beans, miso, and the like. This degassing bag is formed by a laminated film in which an inner film and an outer film are laminated. The inner film is placed facing the contents and is breathable. The outer film is laminated on the outer side of the inner film and has an oxygen barrier property, and is provided through the degassing port.

The gas released from the contents passes through the breathable inner film and is exhausted from the degassing port. This makes it possible to prevent the bag containing the contents from bursting. Further, since the outer film has an oxygen barrier property, fermentation of the contents can be suppressed and the contents can be stored for a long period of time.

Japanese Unexamined Patent Publication No. 10-167335 (pages 3 to 5, Fig. 3)

However, according to the conventional degassing bag, since the degassing port penetrates the outer film, there is a problem that the user mistakenly recognizes that the degassing bag is damaged.

An object of the present invention is to provide a degassing bag capable of preventing misidentification of damage.

In order to achieve the above object, the present invention has a degassing bag in which a laminated film having a degassing port is arranged on at least one side, and the laminated film is thermally bonded to a vapor-deposited film in which a metal vapor-deposited film is arranged on a base film. It is formed by laminating an interior film having a sex resin layer, the interior film has small holes, and a ventilation path made of a non-formed portion of the metal vapor deposition film is communicated with the small holes on the base film. It is characterized in that the ventilation path reaches the outer edge of the laminated film to form the degassing port.

Further, the present invention is characterized in that, in the degassing bag having the above structure, a metal foil is laminated on the upper layer of the vapor-deposited film.

Further, the present invention is characterized in that the metal foil is formed of an aluminum foil in the degassing bag having the above configuration.

Further, the present invention is characterized in that, in the degassing bag having the above configuration, minute pieces of the metal vapor-deposited film are scattered in the air passage.

Further, the present invention is characterized in that the metal vapor-deposited film is formed of an aluminum-deposited film in the degassing bag having the above configuration.

According to the present invention, an air passage made of a non-formed portion of the metal vapor-deposited film is provided so as to communicate with a small hole provided in the interior film, and the air passage reaches the outer edge of the laminated film to form a degassing port. As a result, the degassing port is formed on the outer edge of the laminated film, and it is possible to prevent misidentification of damage to the degassing bag and improve the aesthetic appearance of the degassing bag.

A perspective view showing a degassing bag according to the first embodiment of the present invention. Sectional drawing which shows one laminated film of the degassing bag of 1st Embodiment of this invention. Sectional drawing which shows the other laminated film of the degassing bag of 1st Embodiment of this invention. Sectional drawing which shows one laminated film of the degassing bag of 2nd Embodiment of this invention. Sectional drawing which shows one laminated film of the degassing bag of 3rd Embodiment of this invention.

<First Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a perspective view of the degassing bag of the first embodiment. The degassing bag 1 is composed of a three-way seal bag having an opening 1a at the upper end, and stores contents that generate gas (carbon dioxide gas, etc.) such as coffee beans and miso.

The degassing bag 1 is formed by thermally adhering the three sides (both sides and the bottom) of the peripheral portions of the two laminated films 10 and the laminated film 20 by the sealing portion 3. After filling the degassing bag 1 with the contents, the opening 1a is sealed by heat adhesion. A degassing port 5a is provided on the peripheral edge of one laminated film 10.

FIG. 2 shows a cross-sectional view of the laminated film 10. The laminated film 10 is formed by laminating an interior film 11, a vapor-deposited film 14, and an exterior film 18 in this order from the inner surface side. The interior film 11 and the vapor-deposited film 14 are adhered to each other by the adhesive layer 13. The thin-film deposition film 14 and the exterior film 18 are adhered to each other by the adhesive layer 15.

The interior film 11 is made of a linear low-density polyethylene film, a polypropylene film, or the like, and forms a heat-adhesive resin layer 12. The heat-adhesive resin layer 12 and the heat-adhesive resin layer 22 (see FIG. 3) of the laminated film 20 are heat-bonded to form the seal portion 3. The interior film 11 may be formed by a multilayer structure including the heat-adhesive resin layer 12.

The interior film 11 is formed by penetrating one or more small holes 6. The small holes 6 can be formed by perforated processing, laser processing, or the like.

The thin-film film 14 is formed by depositing a metal-deposited film 14b on the inner surface side of the base film 14a. As the base film 14a, a biaxially stretched film such as a biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film can be used. An aluminum vapor-deposited film can be used as the metal-deposited film 14b. The laminated film 10 has a gas barrier property due to the metal vapor deposition film 14b.

A ventilation path 5 made of a non-formed portion of the metal vapor-deposited film 14b is formed on the base film 14a. The ventilation passage 5 is formed facing the small hole 6 and reaches on the outer edge of the laminated film 10 to form the degassing port 5a.

The ventilation path 5 can be formed by etching the metal vapor deposition film 14b. That is, after the metal-deposited film 14b is formed on the base film 14a, the area other than the planned formation region of the air passage 5 is covered with a resist. Next, the metal vapor deposition film 14b in the region where the air passage 5 is to be formed is removed with a sodium hydroxide solution or the like to form the air passage 5.

The method for forming the air passage 5 is not limited to the above, and the air passage 5 made of a non-formed portion of the metal vapor deposition film 14b may be formed on the base film 14a by another method.

The exterior film 18 is formed of a biaxially stretched polyethylene terephthalate film or the like, and a printing layer (not shown) is provided on the inner or outer surface. The exterior film 18 may be formed in a multilayer structure.

The adhesive layer 13 and the adhesive layer 15 are formed of a thermosetting adhesive for dry laminating such as urethane-based or acrylic-based.

The adhesive layer 15 is applied to the inner surface of the exterior film 18, and the exterior film 18 and the vapor-deposited film 14 are pressed and adhered to each other. The adhesive layer 13 is applied to the outer surface of the interior film 11 and pressurizes and adheres the interior film 11 and the vapor-deposited film 14. An opening 13a in which the adhesive layer 13 is not formed is provided on the interior film 11 so as to face the small holes 6 by patterning. As a result, the ventilation passage 5 communicates with the small hole 6 through the opening 13a. At this time, the opening 13a reaches the outer edge of the laminated film 10 and prevents the air passage 5 from being blocked due to the adhesion between the base film 14a and the interior film 11.

FIG. 3 shows a cross-sectional view of the laminated film 20. The laminated film 20 is formed by laminating an interior film 21, an intermediate film 24, and a vapor-deposited film 26 in this order from the inner surface side. The interior film 11 and the intermediate film 24 are adhered to each other by the adhesive layer 23. The intermediate film 24 and the vapor-deposited film 26 are adhered to each other by the adhesive layer 25.

Like the interior film 11 (see FIG. 2), the interior film 21 is made of a linear low-density polyethylene film, a polypropylene film, or the like, and forms a heat-adhesive resin layer 22. The interior film 21 may be formed by a multilayer structure including the heat-adhesive resin layer 22.

The intermediate film 24 is formed of a biaxially stretched polyethylene terephthalate film or the like, and a printing layer (not shown) is provided on the inner or outer surface. The intermediate film 24 may be formed into a multilayer structure.

The thin-film film 26 is formed by depositing a thin-film film 26b on the inner surface side of the base film 26a. As the base film 26a, a biaxially stretched film such as a biaxially stretched polyethylene terephthalate film or a biaxially stretched nylon film can be used. As the vapor-deposited film 26b, an aluminum oxide-deposited film, a silicon oxide-deposited film, an aluminum-deposited film, or the like can be used. The laminated film 20 has a gas barrier property due to the thin-film film 26b.

The adhesive layer 23 and the adhesive layer 25 are formed of a thermosetting adhesive for dry laminating such as urethane-based or acrylic-based. The adhesive layer 25 is applied to the outer surface of the intermediate film 24, and the intermediate film 24 and the vapor-deposited film 26 are pressed and adhered to each other. The adhesive layer 23 is applied to the outer surface of the interior film 21 and pressurizes and adheres the interior film 21 and the intermediate film 24.

In the degassing bag 1 having the above configuration, the contents are filled from the opening 1a, and the opening 1a is sealed by the heat-adhesive resin layers 12 and 22. The gas barrier metal vapor deposition film 14b and the vapor deposition film 26b can suppress fermentation of the contents and store the contents for a long period of time. Further, carbon dioxide gas generated from the contents such as coffee beans flows through the ventilation passage 5 through the small holes 6 and is discharged to the outside from the degassing port 5a. This prevents the degassing bag 1 from bursting.

Further, since the degassing port 5a is formed on the peripheral edge of the degassing bag 1, it is possible to prevent the user from misidentifying that the degassing bag 1 is damaged and to improve the aesthetic appearance of the degassing bag 1.

According to the present embodiment, a ventilation passage 5 composed of a non-formed portion of the metal vapor-deposited film 14b is provided so as to communicate with the small holes 6 provided in the interior film 11, and the ventilation passage 5 reaches the outer edge of the laminated film 10 and is removed. It forms an air opening 5a. As a result, the degassing port 5a is formed on the outer edge of the laminated film 10, and it is possible to prevent misidentification of damage to the degassing bag 1 and improve the aesthetic appearance of the degassing bag 1.

Further, since the metal-deposited film 14b is formed of the aluminum-deposited film, the laminated film 10 having a high gas barrier property can be easily realized.

<Second Embodiment>
Next, FIG. 4 is a cross-sectional view showing the laminated film 10 of the degassing bag 1 of the second embodiment. For convenience of explanation, the same parts as those of the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals. In this embodiment, the metal foil 16 is provided on the laminated film 10 as compared with the first embodiment. Other parts are the same as those in the first embodiment.

The laminated film 10 is formed by laminating an interior film 11, a vapor-deposited film 14, a metal foil 16, and an exterior film 18 in this order from the inner surface side. The configurations of the interior film 11, the vapor-deposited film 14, and the exterior film 18 are the same as those in the first embodiment.

The metal foil 16 arranged on the upper layer of the thin-film vapor film 14 is formed of an aluminum foil. As the metal foil 16, a titanium foil, a stainless steel foil, or the like may be used. The metal foil 16 can improve the barrier property and the puncture resistance of the laminated film 10.

The adhesive layer 15 and the adhesive layer 17 are formed of a thermosetting adhesive for dry laminating such as urethane-based or acrylic-based. The adhesive layer 15 is applied to the outer surface of the thin-film vapor film 14, and the thin-film film 14 and the metal foil 16 are pressed and adhered to each other. The adhesive layer 17 is applied to the inner surface of the exterior film 18, and the exterior film 18 and the metal foil 16 are pressed and adhered to each other.

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, the metal foil 16 can improve the barrier property and the puncture resistance of the laminated film 10.

Further, when the metal foil 16 is formed of an aluminum foil, a laminated film 10 having high puncture resistance can be easily realized.

Since the metal foil 16 does not transmit laser light, the small holes 6 may be formed by laser processing from the inner surface side after laminating the interior film 11, the vapor deposition film 14, the metal foil 16, and the exterior film 18. As a result, the man-hours for manufacturing the laminated film 10 can be reduced.

<Third Embodiment>
Next, FIG. 5 is a cross-sectional view showing the laminated film 10 of the degassing bag 1 of the third embodiment. For convenience of explanation, the same parts as those of the second embodiment shown in FIG. 4 are designated by the same reference numerals. In this embodiment, in contrast to the second embodiment, the air passage 5 is provided with a minute piece 14c of the metal vapor-deposited film 14b. Other parts are the same as those of the second embodiment.

In the ventilation passage 5, minute pieces 14c of a plurality of columnar metal vapor-deposited films 14b arranged on the base film 14a are scattered. Gas passes between each of the tiny pieces 14c. The outer width of the minute piece 14c is formed to be, for example, several μm.

The fine pieces 14c can be formed by forming the metal vapor-deposited film 14b on the base film 14a, then applying a resist to the region where the fine pieces 14c are to be formed, and removing the metal-deposited film 14b by etching. Fine pieces 14c may be formed by other methods.

According to the present embodiment, in addition to the same effect as that of the second embodiment, since the plurality of minute pieces 14c are scattered, it is possible to prevent the base film 14a in the air passage 5 and the interior film 11 from coming into close contact with each other. As a result, the gas generated from the contents can be reliably released from the degassing port 5a, and the degassing bag 1 can be more reliably prevented from bursting.

The film thickness of the minute pieces 14c in the air passage 5 may be smaller than the film thickness of the metal vapor-deposited film 14b other than the air passage 5. The fine pieces 14c can be formed by removing the metal vapor deposition film 14b up to the base film 14a, removing the resist, applying the resist again to the area other than the planned formation region of the air passage 5, and etching for a predetermined time.

It should be noted that the same micro pieces 14c may be provided in the first embodiment shown in FIGS. 1 to 3 described above.

In the first to third embodiments, both sides of the degassing bag 1 may be formed of the laminated film 10. Further, one laminated film 10 may be bent and the two sides (both sides) of the peripheral portion may be heat-bonded by the sealing portion 3. That is, the laminated film 10 having the degassing port 5a may be arranged on at least one side of the degassing bag 1.

Further, although the opening 13a of the adhesive layer 13 is formed so as to extend to the outer edge of the laminated film 10, the adhesive layer 13 may be provided between the small hole 6 and the degassing port 5a. At this time, the vapor-deposited film 14 and the interior film 11 are adhered to each other on the adhesive layer 13 between the small holes 6 and the degassing port 5a in a non-pressurized state. This makes it possible to prevent the air passage 5 from being blocked due to the adhesion between the base film 14a and the interior film 11.

According to the present invention, it can be used as a degassing bag for storing contents such as coffee beans and miso that generate gas.

1 Degassing bag 1a Opening 3 Sealing part 5 Vent 5a Degassing port 6 Small holes 10, 20 Laminated film 11, 21 Interior film 12, 22 Thermal adhesive resin layer 13, 15, 17, 23, 25 Adhesive layer 13a Opening 14 Vapor-evaporated film 14a Base film 14b Metal-deposited film 14c Fine pieces 16 Metal foil 18 Exterior film 24 Intermediate film 26 Evaporated film 26a Base film 26b Evaporated film

Claims (5)

In a degassing bag in which a laminated film having a degassing port is arranged on at least one side, a vapor-deposited film in which the laminated film has a metal vapor-deposited film arranged on a base film and an interior film having a heat-adhesive resin layer are laminated. The interior film has small holes, and a ventilation path made of a non-formed portion of the metal vapor-deposited film is provided on the base film so as to communicate with the small holes, and the ventilation path is formed of the laminated film. A degassing bag characterized by reaching the outer edge and forming the degassing port. The degassing bag according to claim 1, wherein a metal foil is laminated on the upper layer of the vapor-deposited film. The degassing bag according to claim 2, wherein the metal foil is formed of an aluminum foil. The degassing bag according to any one of claims 1 to 3, wherein minute pieces of the metal vapor-deposited film are scattered in the air passage. The degassing bag according to any one of claims 1 to 4, wherein the metal vapor-deposited film is formed of an aluminum-deposited film.

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