JP7162909B2 - Gas vent valve, container and adhesive sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas vent valve, a container provided with the gas vent valve, and an adhesive sheet provided with the gas vent valve.

Conventionally, fermented foods such as coffee beans, miso, and kimchi are distributed as packages wrapped with packaging materials. The package in which the fermented food is packaged is provided with a ventilation hole for releasing gas generated from the package to the outside of the package, and a gas vent valve is attached so as to cover the ventilation hole. ing. The vent valve opens when the pressure within the package is increased by gas generated within the package, releasing the gas to the outer region of the package. After the gas is released, the valve is closed to prevent oxygen from flowing into the package from the external region. This suppresses deterioration in the quality of fermented foods.

As such a gas vent valve, for example, in Patent Document 1, a valve seat film in which one valve hole is formed, a valve plate film arranged opposite to the valve seat film, and a a gas vent valve comprising a first solid sealing layer adhered to the valve seat film and a second solid sealing layer adhered to the valve plate film and disposed opposite the first solid sealing layer; disclosed. In the gas vent valve of Patent Document 1, when the pressure inside the package exceeds a predetermined pressure, that is, the valve opening pressure, the valve plate film moves away from the valve seat film, and the first solid sealing layer and the second solid sealing layer to open the valve. Then, when the pressure in the package falls below the valve opening pressure, the valve plate film moves toward the valve seat film, so that at least the first solid sealing layer and the second solid sealing layer are separated. Part of the valve closes and closes. That is, in the gas vent valve of Patent Document 1, the gas in the package passes through the interlayer between the first solid seal layer and the second solid seal layer and is released from the side surface side of the gas vent valve. .

Japanese Unexamined Patent Application Publication No. 2018-2248

In the gas vent valve of Patent Document 1, in order to reduce the initial valve opening pressure and facilitate the release of the gas in the package, the size of the gas vent valve is reduced and the first solid sealing layer and the first solid sealing layer are separated. It is necessary to reduce the area where the second solid seal layer is in close contact. However, if the size of the gas vent valve is reduced, the valve hole becomes relatively small, and the gas in the package is less likely to be released. The problem was that it was difficult to Therefore, development of a gas vent valve having a new structure is required in order to reduce the initial valve opening pressure.

The present invention has been made in view of such a situation, and includes a gas vent valve capable of reducing the initial valve opening pressure, a container including the gas vent valve, and an adhesive including the gas vent valve. The task is to provide a sheet.

A gas vent valve according to the present invention comprises a valve plate film forming a first valve hole, a valve seat film laminated on one side of the valve plate film and forming a second valve hole, and the valve plate film. and the valve seat film, and a solid seal layer fixed to the valve plate film so as not to block the first valve hole and the second valve hole, and when viewed from the stacking direction, The first valve hole and the second valve hole are arranged at mutually different positions, and the valve plate film moves away from the valve seat film, thereby forming the valve seat film and the solid sealing layer. A valve open state in which gas is ventilated from the second valve hole to the first valve hole through the ventilation path, and a direction in which the valve plate film approaches the valve seat film. and a closed state in which the valve seat film and the solid sealing layer are brought into close contact with each other by moving the valve main body portion.

In the gas vent valve, the first valve hole and the second valve hole are arranged at positions different from each other when viewed from the stacking direction, and when the valve is open, the valve seat film and the solid sealing layer are separated from each other. Gas is vented from the second valve hole to the first valve hole via a vent passage therebetween. By using the gas vent valve having such a configuration, by adjusting the distance between the first valve hole and the second valve hole without changing the size of the gas vent valve, It is possible to reduce the area where the valve seat film and the solid sealing layer are in close contact. As a result, the gas vent valve can reduce the initial valve opening pressure.

The gas vent valve according to the present invention further includes a fixing portion arranged continuously on the outer periphery of the valve body portion when viewed from the stacking direction, and the valve seat film and the valve plate film are fixed to each other, The fixing portion may include a plurality of embossed portions formed on the other surface of the valve plate film.

The embossed portion functions as a spacer to prevent the gas vent valve from being crushed by external pressure during transportation or storage. Thereby, the gas vent valve can be opened smoothly.

In the gas vent valve according to the present invention, the valve plate film has a first inner peripheral edge forming the first valve hole, and the solid sealing layer is at least the first inner peripheral edge of the valve plate film. It may be fixed to the inner peripheral edge.

With such a configuration, the gas vent valve is excellent in shutting off from the external area, and can prevent the gas-generating substance in the package from scattering to the external area.

In the gas vent valve according to the present invention, the solid sealing layer may be adhered only to the first inner peripheral edge of the valve plate film.

With such a configuration, the gas vent valve can further reduce the initial valve opening pressure.

In the gas vent valve according to the present invention, the valve seat film has a second inner peripheral edge forming the second valve hole, and at least the second inner peripheral edge of the valve seat film and the valve A release agent layer may be further provided between the plate film.

With such a configuration, the gas vent valve can easily separate the second inner peripheral edge portion of the valve seat film from the valve plate film, so that the gas in the package can be quickly released to the outside.

The gas vent valve according to the present invention may further include an adhesive layer fixed to one side surface of the valve seat film, and attached to the package via the adhesive layer.

With such a configuration, the gas vent valve can be easily fixed to the surface of the package.

A container according to the present invention includes a package including a gas-generating substance and a packaging material for packaging the gas-generating substance, and the gas vent valve described above attached to the package.

By providing the above-described degassing valve, the containing body can suppress deterioration of the quality of the gas generating material.

The adhesive sheet according to the present invention includes one or more of the gas vent valves described above.

Such a configuration makes it easier to move and convey the gas vent valve to another location. In addition, it becomes easy to attach the degassing valve to the package by automating it with a sticking device or the like.

ADVANTAGE OF THE INVENTION According to this invention, the gas vent valve which can reduce initial valve-opening pressure, a container provided with this gas vent valve, and the adhesive sheet provided with the said gas vent valve can be provided.

FIG. 1 is a plan view of a gas vent valve 1 according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the gas vent valve 1 shown in FIG. 1 taken along the line II-II. FIG. 3 is a plan view of the gas vent valve 1 according to the second embodiment of the invention. FIG. 4 is a plan view of a gas vent valve 1 according to a third embodiment of the invention.

[First embodiment]
<Gas release valve>
A gas vent valve 1 according to a first embodiment of the present invention will be described below with reference to the drawings. In the drawings below, the same reference numerals are given to the same or corresponding parts, and the description thereof will not be repeated.

FIG. 1 is a plan view of a gas vent valve 1 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the gas vent valve 1 shown in FIG. 1 taken along line II-II. As shown in FIG. 2, the gas vent valve 1 includes a valve plate film 2, a valve seat film 4 laminated on one side of the valve plate film 2 (bottom side in the Z direction in FIG. 2), and a valve plate film 2 and the valve seat film 4 and a solid sealing layer 5 which is adhered to the valve plate film 2 . In this specification, the direction in which the valve plate film 2 and the valve seat film 4 are laminated (the Z direction in FIG. 2) is referred to as the "laminating direction."

A first valve hole 31 is formed in the valve plate film 2 . The valve plate film 2 has a first inner peripheral edge 91 forming a first valve hole 31 , i.e. the first valve hole 31 is formed by the first inner peripheral edge 91 . A second valve hole 32 is formed in the valve seat film 4 . The valve seat film 4 has a second inner peripheral edge 92 forming the second valve hole 32 , i.e. the second valve hole 32 is formed by the second inner peripheral edge 92 .

When viewed from the stacking direction, the first valve hole 31 and the second valve hole 32 are arranged at different positions. Specifically, the second valve hole 32 is arranged on the upstream side in the ventilation direction (the Y direction in the drawing), which will be described later, and the first valve hole 31 is arranged on the downstream side. The first valve hole 31 and the second valve hole 32 have a circular shape when viewed from the stacking direction, and the diameter thereof can be, for example, 2 mm or more and 10 mm or less.

The valve plate film 2 and the valve seat film 4 are made of deformable films so as to follow the deformation of the package. As the valve plate film 2 and the valve seat film 4, for example, a non-adhesive flexible resin film can be used. Examples of non-adhesive flexible resin films include resin films made of polyethylene terephrate, polyolefin, and the like. It is preferable that the valve plate film 2 and the valve seat film 4 are made of resin films of the same material and shape. As a result, it is possible to prevent the valve opening pressure from changing due to the difference in heat shrinkage between the two films and the peeling of the fixing portion 6, which will be described later. The thicknesses of the valve plate film 2 and the valve seat film 4 are preferably 12 μm or more and 200 μm or less, and more preferably 16 μm or more and 100 μm or less. The valve plate film 2 and the valve seat film 4 have a rectangular shape when viewed from the stacking direction, and the length of one side thereof can be, for example, 15 mm or more and 35 mm or less. The corners are chamfered (R-chamfered) in a curved shape.

The solid sealing layer 5 is adhered only to the first inner peripheral edge portion 91 of the valve plate film 2 so as not to block the first valve hole 31 . That is, when viewed from the stacking direction, the solid sealing layer 5 is formed in a circular frame shape having an opening in the center that is continuous with the first valve hole 31 . The width of the solid sealing layer 5 (that is, the shortest distance from the inner peripheral edge to the outer peripheral edge of the solid sealing layer 5) can be, for example, 1 mm or more and 4 mm or less.

As the solid sealing layer 5, for example, a layer made of UV curable resin or the like having self-adsorptive properties can be used. Among these, the solid seal layer 5 is preferably made of a UV curable resin capable of controlling the self-sucking force from the viewpoint of reducing the valve opening pressure. Such UV curable resins include, for example, silicone-based monomers/oligomers having acrylate groups, long-chain alkyl-based monomers/oligomers having acrylate groups, or mixtures of these monomers/oligomers and thermoplastic polymers. etc. The solid sealing layer 5 may be a layer made of one kind of material, or a layer made of a mixture of two or more kinds of materials. The thickness of the solid seal layer 5 is preferably 1 μm or more and 15 μm or less.

As shown in FIG. 2, the gas vent valve 1 further includes a primer layer fixed via an adhesive layer 15 to one side of the valve plate film 2 in the lamination direction (bottom side in the Z direction in FIG. 2). 13. That is, the solid sealing layer 5 is fixed to the valve plate film 2 via this primer layer 13 . The primer layer 13 is provided to improve adhesion between the valve plate film 2 and the solid seal layer 5 or the later-described release agent layer 11 . The primer layer 13 is preferably non-adhesive. As the non-adhesive primer layer 13, for example, a layer made of UV curable resin or the like having smoothness can be used. Such UV curable resins include, for example, a monomer/oligomer having an acrylate group, or a mixture of the monomer/oligomer and a thermoplastic polymer. The thickness of the primer layer 13 is preferably 1 μm or more and 10 μm or less.

As shown in FIG. 2 , the gas vent valve 1 further comprises a release agent layer 11 between the second inner peripheral edge 92 of the valve seat film 4 and the valve plate film 2 . Specifically, the release agent layer 11 has a circular shape when viewed from the stacking direction, and is provided so as to cover the second valve hole 32 . Its diameter can be, for example, 2 mm or more and 12 mm or less. The release agent layer 11 is in close contact with the second inner peripheral edge 92 of the valve seat film 4 at the outer peripheral edge on one side in the stacking direction (bottom side in the Z direction in FIG. 2). On the other hand, the release agent layer 11 is fixed to the primer layer 13 over the entire surface on the other side in the stacking direction (top side in the Z direction in FIG. 2). As the release agent layer 11, a layer made of a UV curable resin or the like having releasability can be used. Such UV curable resins include, for example, silicone-based monomers/oligomers having acrylate groups, long-chain alkyl-based monomers/oligomers having acrylate groups, or mixtures of these monomers/oligomers and thermoplastic polymers. etc. The thickness of the release agent layer 11 is preferably 1 μm or more and 10 μm or less.

As shown in FIG. 2, the gas vent valve 1 further includes an adhesive layer 12 fixed to one side of the valve seat film 4 in the stacking direction (bottom side in the Z direction in FIG. 2). The gas vent valve 1 can be attached to the surface of the package via the adhesive layer 12 . As the adhesive layer 12, for example, a layer made of a known adhesive such as a rubber-based adhesive, an acrylic adhesive, a silicone-based adhesive, an EVA-based emulsion adhesive, a synthetic rubber-based adhesive, or a cyanoacrylate-based adhesive. A layer made of a known adhesive such as The thickness of the adhesive layer 12 is preferably 10 μm or more and 50 μm or less, more preferably 15 μm or more and 25 μm or less.

The adhesive layer 12 is formed so that the peel strength of the adhesive layer 12 against the packaging material is greater than the peel strength between the solid sealing layer 5 and the valve seat film 4 . As a result, when the valve is opened, an air passage can be formed between the solid sealing layer 5 and the valve seat film 4 without forming an unintended air passage between the adhesive layer 12 and the package. .

The gas vent valve 1 has a valve body portion 14 and a fixing portion 6 arranged continuously on the outer periphery of the valve body portion 14 when viewed from the stacking direction. The fixed portion 6 is arranged so as to surround the entire outer circumference of the valve body portion 14 . The width of the valve body 14, that is, the length along the direction perpendicular to the ventilation direction (the X direction shown in FIG. 1) can be, for example, 15 mm or more and 25 mm or less. Also, the length of the valve body 14, that is, the length along the ventilation direction (the Y direction shown in FIG. 1) can be, for example, 25 mm or more and 35 mm or less. The width of the fixing portion 6 is preferably substantially the same over the entire circumference, and can be, for example, 2.5 mm or more and 4 mm or less.

By moving the valve plate film 2 away from the valve seat film 4, the valve body 14 forms a gas passage along the gas ventilation direction between the valve seat film 4 and the solid sealing layer 5. The valve seat film is opened by moving the valve plate film 2 toward the valve seat film 4 in a valve open state in which gas is ventilated from the second valve hole 32 to the first valve hole 31 through the air passage. 4 and the solid sealing layer 5 are in close contact with each other. In addition, FIG. 2 shows the gas vent valve 1 in a closed state.

Specifically, first, in the valve closed state, the gas inside the package is not released to the outside area, and the inflow of oxygen from the outside area into the package is suppressed. In the valve closed state, when the internal pressure in the package exceeds a predetermined pressure, that is, the valve opening pressure, the valve plate film 2 moves away from the valve seat film 4, and the valve changes from the closed state to the open state.

Then, in the open state, the gas inside the package is released to the outside area. When the internal pressure in the package falls below a predetermined pressure, that is, the valve opening pressure in the valve open state, the valve plate film 2 moves toward the valve seat film 4 , causing the valve seat film 4 and the solid sealing layer 5 to separate. It closes and returns to the closed state. As a result, the gas vent valve 1 functions as a check valve whose ventilation direction is the direction from the second valve hole 32 to the first valve hole 31 via the ventilation path.

It should be noted that the valve opening pressure is pressure exceeding the atmospheric pressure, and is preferably equal to or less than the bursting strength of the packaging material (JIS-P-8112 Mullen method). In order for the gas vent valve 1 to open at a slight pressure, such as the pressure of the gas generated from the gas generating material, it is preferable to set the valve opening pressure to a pressure close to the atmospheric pressure. Specifically, the valve opening pressure is preferably 1.0 kgf/cm ² or more and 2.0 kgf/cm ² or less, more preferably 1.0 kgf/cm ² or more and 1.5 kgf/cm ² or less. .

At the fixing portion 6, the valve plate film 2 and the valve seat film 4 are fixed. Specifically, at the fixing portion 6 , the valve plate film 2 and the valve seat film 4 are fixed with an adhesive layer 15 interposed therebetween. As shown in FIG. 2, the fixing portion 6 has a plurality of embossed portions 7 formed on the surface of the valve plate film 2 on the other side in the stacking direction (top side in the Z direction in FIG. 2). Specifically, ten circular embossed portions 7 are arranged at regular intervals on the fixed portion 6 . The embossed portion 7 can smoothly open the gas vent valve 1 by functioning as a spacer to prevent the gas vent valve 1 from being crushed by external pressure during transportation or storage.

In the gas vent valve 1 according to the present embodiment, the first valve hole 31 and the second valve hole 32 are arranged at different positions when viewed from the stacking direction, and in the valve open state, the valve seat film 4 and the solid Gas is ventilated from the second valve hole 32 to the first valve hole 31 through the ventilation path between the seal layer 5 and the seal layer 5 . By using the gas vent valve 1 having such a configuration, even if the size of the gas vent valve 1 is increased and the number of the embossed portions 7 is increased, the first valve hole 31 and the second valve hole 32 are By adjusting the distance between the two, it is possible to reduce the area where the valve seat film 4 and the solid sealing layer 5 are in close contact with each other in the air passage. As a result, the gas vent valve 1 is less likely to be affected by external pressure, and the initial valve opening pressure can be reduced.

In the gas vent valve 1 according to this embodiment, the solid seal layer 5 is fixed to the first inner peripheral edge portion 91 of the valve plate film 2, so that the gas vent valve 1 has excellent shutoff from the external area and the inside of the package. It is possible to prevent the scattering of gas generating substances in the outside area.

In the gas vent valve 1 according to this embodiment, the solid seal layer 5 is fixed only to the first inner peripheral edge portion 91 of the valve plate film 2, so that the initial valve opening pressure can be further reduced.

The gas vent valve 1 according to this embodiment further includes a release agent layer 11 between the second inner peripheral edge portion 92 of the valve seat film 4 and the valve plate film 2, thereby Since the inner peripheral edge portion 92 of 2 and the valve plate film 2 are easily separated from each other, the gas in the package can be quickly released to the outside.

The gas vent valve 1 according to this embodiment further includes an adhesive layer 12 fixed to one side surface of the valve seat film 4, and by attaching the adhesive layer 12 to the packaging body, the gas vent valve can be operated. It can be easily adhered to the surface of the package.

Next, an example of a method for manufacturing the gas vent valve 1 according to this embodiment will be described.

First, the primer layer 13 is formed on the surface of the valve plate film 2 in which the valve hole 31 is formed via the adhesive layer 15, and the solid seal layer 5 and the release agent layer 11 are formed on the surface of the primer layer 13. . Specifically, after applying an adhesive to the surface of the valve plate film 2 , a UV curable resin for the primer layer 13 is applied and cured by ultraviolet irradiation to form the primer layer 13 . Subsequently, a UV curable resin for forming the solid seal layer 5 and the release agent layer 11 is applied and cured by ultraviolet irradiation to form the solid seal layer 5 and the release agent layer 11 .

Next, the valve plate film 2 and the valve seat film 4 are arranged so that the solid sealing layer 5 and the release agent layer 11 face the valve seat film 4 having the valve hole 32 formed therein, and the gas vent valve 1 is A fixed portion 6 is formed by fixing the valve plate film 2 and the valve seat film 4 along the outer periphery. The adhesive layer 12 may be laminated on the valve seat film 4 in advance.

Subsequently, the embossed portion 7 is formed on the fixing portion 6 by hot pressing from above and below using two molds, a male mold (convex) and a female mold (concave). Thereby, the gas vent valve 1 can be manufactured.

<Container>
Next, the container according to this embodiment will be described. The container according to the present embodiment includes a package including a gas-generating substance and a packaging material for packaging the gas-generating substance, and the above-described gas vent valve 1 attached to the package. The container may be provided with a lid so as to cover at least part of the surface of the package to which the gas vent valve 1 is attached. A slight gap is provided between the lid and the package so that the gas released from the gas vent valve 1 can be released to the outer region of the lid.

Examples of the gas-generating substance include coffee beans, heated coffee, black tea, tea beverages such as tea, miso, kimchi, cheese, fermented foods such as sauerkraut, and heated foods such as microwave ovens. Ethylene gas-generating products such as foods, fruits and vegetables, gas-generating chemical products such as detergents that generate gas, and the like can be mentioned.

The packaging material is provided with through-holes through which the gas in the package is released. The gas vent valve 1 is attached to the package so that the hole and the second valve hole 32 communicate with each other. A gas vent valve 1 is attached to the package via an adhesive layer 12 .

As the packaging material, for example, it is possible to use a material containing a resin, which is formed into a bag shape, a container shape, or the like.

By providing the gas vent valve 1 described above, the containing body can suppress deterioration of the quality of the gas generating material.

<Adhesive sheet>
The adhesive sheet according to this embodiment includes one or a plurality of gas vent valves 1 described above. The adhesive sheet includes one or more gas vent valves 1 and a release sheet. The gas vent valve 1 is fixed to the release sheet via an adhesive layer 12 . At the time of use, after peeling off the release sheet to separate the gas vent valve 1 from the adhesive sheet to expose the adhesive layer 12, the gas vent valve 1 can be fixed to the package. As a result, the gas vent valve 1 can be easily moved and conveyed to another place, and the gas vent valve 1 can be easily attached to the package by automating with a sticking device or the like.

[Second embodiment]
Hereinafter, a gas vent valve 1 according to a second embodiment of the present invention will be described with reference to the drawings for portions different from the first embodiment. In the drawings below, the same reference numerals are given to the same or corresponding parts, and the description thereof will not be repeated.

FIG. 3 is a plan view of the gas vent valve 1 according to the second embodiment of the invention. As shown in FIG. 3, the solid sealing layer 5 is adhered to the valve plate film 2 over the entire valve body 14 so as not to block the first valve hole 31 and the second valve hole 32. . That is, when viewed from the lamination direction, the solid sealing layer 5 is formed in a rectangular shape having an opening continuous with the first valve hole 31 and an opening continuous with the second valve hole 32 . A circular release agent layer 11 is formed so as to cover the second valve hole 32 at the opening that is continuous with the second valve hole 32 .

In the gas vent valve 1 according to the second embodiment of the present invention, the solid seal layer 5 is fixed to at least the first inner peripheral edge portion 91 of the valve plate film 2, so that it is excellent in shutting off from the external region. Moreover, it is possible to prevent the gas-generating substance in the package from scattering to the outside area.

[Third embodiment]
Hereinafter, a gas vent valve 1 according to a third embodiment of the present invention will be described with reference to the drawings for portions different from the first embodiment. In the drawings below, the same reference numerals are given to the same or corresponding parts, and the description thereof will not be repeated.

FIG. 4 is a plan view of a gas vent valve 1 according to a third embodiment of the invention. As shown in FIG. 4 , the solid sealing layer 5 is in close contact with the second inner peripheral edge 92 of the valve seat film 4 so as not to block the second valve hole 32 . That is, the solid sealing layer 5 is formed in a circular frame shape having an opening in the center that is continuous with the second valve hole 32 .

Inside the solid seal layer 5 , a circular release agent layer 11 is formed continuously with the solid seal layer 5 so as to cover the second valve hole 32 . Further, on the outside of the solid seal layer 5, a release agent layer 11 is formed continuously with the solid seal layer 5 over the entire valve body 14 so as not to block the first valve hole 31. there is That is, the release agent layer 11 is adhered to at least the first inner peripheral edge portion 91 of the valve plate film 2 via the primer layer 13 . As a result, the first inner peripheral edge portion 91 of the valve plate film 2 and the valve seat film 4 are easily separated from each other, so that the gas in the package can be quickly released to the outside.

[Other embodiments]
The first to third embodiments of the present invention (hereinafter collectively referred to as the present embodiment) have been described above, but the present invention is not limited to the present embodiment. Various modifications can be made without departing from the gist of the invention.

In the gas vent valve 1 according to this embodiment, the first valve hole 31 and the second valve hole 32 are arranged at different positions when viewed from the stacking direction. However, the present invention is not limited to this configuration, and other valve holes may be arranged at different positions when viewed from the stacking direction. Other valve holes may be formed in the valve plate film 2 or may be formed in the valve seat film 4 .

In the gas vent valve 1 according to this embodiment, the shapes of the first valve hole 31 and the second valve hole 32 are circular when viewed from the stacking direction. However, the present invention is not limited to this configuration, and may be an elliptical shape, a polygonal shape, or the like. Also, the first valve hole 31 may have a shape in which a part of these shapes are missing. When viewed from the stacking direction, the first valve hole 31 is formed in contact with the edge of the valve plate film 2, so that the first valve hole 31 has the above-described chipped shape.

In the gas vent valve 1 according to this embodiment, the shape of the valve plate film 2 and the valve seat film 4 is rectangular when viewed from the stacking direction. However, the present invention is not limited to this configuration, and may be circular, elliptical, polygonal, or the like. In addition, in the gas vent valve 1 according to this embodiment, the corners of the valve plate film 2 and the valve seat film 4 are chamfered (R-chamfered) in a curved shape. However, the present invention is not limited to this configuration, and may be chamfered linearly (C-chamfered) or may not be chamfered.

In the gas vent valve 1 according to this embodiment, the solid sealing layer 5 is adhered to the valve plate film 2 via the primer layer 13 . However, the present invention is not limited to this configuration, and the primer layer 13 may not be provided. That is, the valve plate film 2 and the solid sealing layer 5 may be directly adhered. Also, the primer layer 13 may be provided between the valve seat film 4 and the solid sealing layer 5 . Thereby, the adhesion between the valve seat film 4 and the solid sealing layer 5 can be improved.

In the gas vent valve 1 according to this embodiment, the fixed portion 6 is arranged continuously with the valve body portion 14 over the entire outer circumference of the valve body portion 14 when viewed from the stacking direction. However, the present invention is not limited to this configuration, and the fixing portion 6 may be arranged continuously on a part of the outer circumference of the valve body portion 14 . That is, the valve main body 14 may be arranged in contact with the edge of the gas vent valve 1 when viewed from the stacking direction.

In the gas vent valve 1 according to this embodiment, ten circular embossed portions 7 are arranged at regular intervals in the fixed portion 6 . However, the present invention is not limited to this configuration, and the number and arrangement pattern of the embossed portions 7 can be appropriately changed according to the shape and size of the fixed portion 6 . Also, the shape of the embossed portion 7 may be elliptical or polygonal.

The gas vent valve 1 according to this embodiment may further include a sensor ink layer on the surface of the valve plate film 2 on the other side in the stacking direction. With such a configuration, it is possible to prevent misalignment in the production line, forgetting to apply the adhesive, and the like. As the sensor ink layer (not shown), for example, a layer made of black light ink or the like can be used. The sensor ink layer can be provided, for example, in a region that overlaps with the region where the second valve hole 32 is formed when viewed from the stacking direction.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

<Production of gas vent valve>
(Example 1)
In Example 1, the gas vent valve 1 according to the first embodiment having the structure shown in FIGS. 1 and 2 was produced. The gas vent valve 1 had a rectangular shape of 20 mm×30 mm when viewed from the stacking direction, and the diameters of the first valve hole 31 and the second valve hole 32 were 7 mm. The solid sealing layer 5 had a width of 4 mm (inner diameter: 7 mm, outer diameter: 11 mm). The release agent layer 11 had a diameter of 9 mm. Further, the gas vent valve 1 of Example 1 further includes a sensor ink layer on the surface of the valve plate film 2 on the other side in the stacking direction. The sensor ink layer was provided in a region overlapping the region where the second valve hole 32 was formed when viewed from the stacking direction.

(Example 2)
In Example 2, the gas vent valve 1 according to the second embodiment having the structure shown in FIG. 3 was produced. The solid seal layer 5 had a rectangular shape of 14 mm×24 mm, and the diameter of the opening connected to the first valve hole 31 was 7 mm, and the diameter of the opening connected to the second valve hole 32 was 9 mm. The same as Example 1 except that the solid sealing layer 5 had the size and shape described above.

(Example 3)
In Example 3, the gas vent valve 1 according to the third embodiment having the structure shown in FIG. 4 was manufactured. The solid seal layer 5 had a width of 4 mm (inner diameter: 8 mm, outer diameter: 12 mm). The release agent layer 11 positioned inside the solid seal layer 5 was circular with a diameter of 7 mm, and the release agent layer 11 positioned outside the solid seal layer 5 was rectangular with a size of 14 mm×24 mm. Example 1 was the same as in Example 1, except that the solid seal layer 5 and release agent layer 11 had the sizes and shapes described above.

(Comparative example 1)
In Comparative Example 1, a gas vent valve having the structure shown in Patent Document 1 was produced. The gas vent valve had a rectangular shape of 20 mm×20 mm when viewed from the stacking direction, and the width of the valve body was 14 mm. Also, the number of embossed portions was set to 4 (total of 8) in each fixing portion.

The gas vent valves of Examples and Comparative Examples consisted of a resin film made of polyethylene terephrate (thickness: 25 μm) as a valve plate film, a resin film made of polyethylene terephrate (thickness: 100 μm) as a valve seat film, X-62-7205 (manufactured by Shin-Etsu Chemical Co., Ltd., thickness: 7 μm) as a solid sealing layer, FD Clear Coat FR (manufactured by Toyo Ink Co., Ltd., thickness: 5 μm) as a primer layer, and the primer layer adhered to the surface of the valve plate film. Acrylic adhesive (thickness: 20 μm) as an adhesive layer, Peel OP varnish UP-200 (manufactured by T&K TOKA, thickness: 5 μm) as a release layer, acrylic adhesive (thickness: 5 μm) as an adhesive layer : 20 μm), rubber varnish (thickness: 5 μm) as the elastic member layer, and black light ink (thickness: 1 μm) as the sensor ink layer. The surface of the valve seat film to which the solid sealing layer was adhered was roughened by applying matte varnish. The embossed portion was formed at the same time as the valve plate film and the valve seat film were heat-sealed. The height of the embossed portion was 280 μm.

<Measurement of initial opening pressure and closing time>
The gas vent valve of each example and comparative example was attached to the package, and a lid was provided so as to cover the gas vent valve. The surface of the package is provided with an introduction hole for introducing gas in addition to a through hole provided at a position where a gas vent valve is attached. The initial opening pressure (kPa) of the gas vent valve was measured by introducing gas into the package through the introduction hole at a flow rate of 10 mL/min. In addition, the closing time (seconds) from the opening of the gas vent valve to the closing of the gas vent valve of each example was continuously measured three times. Closure times were measured up to 1200 seconds. Table 1 shows the measurement results. The gas vent valve of Example 1 has N number = 4, the gas vent valve of Example 2 has N number = 2, the gas vent valve of Example 3 has N number = 2, and the gas vent valve of Comparative Example 1 has N Number = 3, each mean.

As can be seen from the results in Table 1, the gas vent valve of each example that satisfies all the constituent requirements of the present invention, compared to the gas vent valve of Comparative Example 1, did not affect the size of the gas vent valve at the initial stage. Opening pressure can be reduced.

The vent valves of Examples 1 and 2 have a short average closing time because the solid sealing layer is adhered to at least the first inner peripheral edge of the valve plate film. Therefore, it is possible to provide excellent insulation from the external area and to prevent the gas-generating substance in the package from scattering to the external area.

REFERENCE SIGNS LIST 1 gas vent valve 2 valve plate film 4 valve seat film 5 solid seal layer 6 fixing portion 7 embossed portion 11 release agent layer 12 adhesive layer 13 primer layer 14 valve body portion 15 adhesive layer 31 first valve hole 32 second Valve hole 91 First inner peripheral edge 92 Second inner peripheral edge

Claims (7)

a valve plate film forming a first valve hole;
a valve seat film laminated on one side of the valve plate film and forming a second valve hole;
a solid sealing layer fixed to the valve plate film between the valve plate film and the valve seat film so as not to block the first valve hole and the second valve hole;
When viewed from the stacking direction, the first valve hole and the second valve hole are arranged at different positions,
By moving the valve plate film in a direction away from the valve seat film, an air passage is formed between the valve seat film and the solid sealing layer, and from the second valve hole through the air passage. A valve open state in which gas is ventilated to the first valve hole, and a valve closed state in which the valve seat film and the solid sealing layer are brought into close contact with each other by moving the valve plate film toward the valve seat film. and a valve body configured to be switchable,
The valve seat film has a second inner peripheral edge forming the second valve hole,
further comprising a release agent layer between at least the second inner peripheral edge of the valve seat film and the valve plate film;
The degassing valve, wherein the release agent layer is fixed over the entire surface on the other side in the stacking direction. Furthermore, when viewed from the stacking direction, the valve body has a fixed portion continuously disposed on the outer periphery of the valve body portion and to which the valve seat film and the valve plate film are fixed,
2. The vent valve according to claim 1, wherein the fixing portion comprises a plurality of embossed portions formed on the other surface of the valve plate film. The valve plate film has a first inner peripheral edge forming the first valve hole,
3. The vent valve of claim 1 or 2, wherein the solid sealing layer is adhered to at least the first inner peripheral edge of the valve plate film. 4. The vent valve of claim 3, wherein said solid sealing layer is adhered only to said first inner peripheral edge of said valve plate film. Further comprising an adhesive layer fixed to one side surface of the valve seat film,
The gas vent valve according to any one of claims 1 to 4, which is attached to the package via the adhesive layer. A container comprising a package including a gas-generating substance and a packaging material for packaging the gas-generating substance, and the gas vent valve according to any one of claims 1 to 5 attached to the package. An adhesive sheet comprising one or more of the degassing valves according to any one of claims 1 to 5.

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