JP2024032848A - Valve structure and package with the same - Google Patents

Abstract

To provide a valve structure and a package with the same capable of preventing moisture from mixing into a packaging container while gas vent can be performed when inner pressure of the packaging container increases.SOLUTION: A valve structure attached to a packaging container is provided. The valve structure includes: an outer valve body with a passage formed inside which communicates the inside with the outside of the packaging container; a nonreturn valve disposed inside the passage; and a moisture barrier mechanism disposed at a secondary side which is a side toward the outside of the nonreturn valve so as to block the passage.SELECTED DRAWING: Figure 1

Description

The present invention relates to a valve structure and a package including the same.

Japanese Unexamined Patent Publication No. 2016-31934 (Patent Document 1) discloses a battery in which a battery element is housed in a pouch. A valve structure having a check valve is attached to a heat-sealed portion formed along the periphery of the pouch. This check valve is configured to operate and vent gas when the internal pressure of the pouch rises above a certain level.

Further, Japanese Patent Application Publication No. 2010-153841 (Patent Document 2) discloses a battery in which a battery element is housed in a box-shaped laminate container. This laminate container has a flange-shaped heat-sealed portion formed along its periphery, which has a portion (hereinafter referred to as an easy-peel portion) that is more easily peeled off than other portions. The easy peel part peels off when the internal pressure of the laminate container rises above a certain level, and gas is vented through a hole formed in the center of the easy peel part. The easy peel portion is a break valve that does not return to its original state once it is peeled off, unlike the check valve as disclosed in Patent Document 1.

JP2016-31934A Japanese Patent Application Publication No. 2010-153841

By the way, a check valve is generally a one-way valve, and usually cannot completely prevent backflow. Therefore, it is actually difficult for a check valve like the one disclosed in Patent Document 1, which vents gas inside the pouch, to completely prevent atmospheric air from entering the pouch. Therefore, in the battery as disclosed in Patent Document 1, moisture contained in the atmosphere gets mixed into the pouch, causing deterioration of the battery.

On the other hand, in the battery as disclosed in Patent Document 2, once the rupture valve is ruptured, the atmosphere enters into the laminate container through the passage formed by the rupture. Therefore, even when a rupture valve is used as in Patent Document 2, moisture contained in the atmosphere gets mixed into the laminate container, causing deterioration of the battery.

An object of the present invention is to provide a valve structure that can vent gas when the internal pressure of the packaging container increases, while also preventing moisture from entering the packaging container, and a packaging body equipped with the same. purpose. Note that the present invention is not limited to the example of a battery as described above, but can be applied to various packages or valve structures included therein in which the ingress of moisture into the interior may be a problem.

A valve structure according to a first aspect of the present invention is a valve structure that is attached to a packaging container, and includes an outer valve body in which a passage that communicates the inside and outside of the packaging container is formed, and an outer valve body that is disposed within the passage. and a moisture barrier mechanism disposed on a secondary side, which is a side facing outside, of the check valve so as to close the passage.

A valve structure according to a second aspect of the present invention is the valve structure according to the first aspect, in which the moisture barrier mechanism ruptures when the pressure on the primary side, which is the side facing the inside, increases. Contains valve.

A valve structure according to a third aspect of the present invention is the valve structure according to the first aspect or the second aspect, wherein the moisture barrier mechanism includes a layer of waterproof liquid.

A valve structure according to a fourth aspect of the present invention is a valve structure according to any one of the first to third aspects, and further includes an accumulator disposed on the primary side of the moisture barrier mechanism.

A valve structure according to a fifth aspect of the present invention is a valve structure according to any one of the first to fourth aspects, wherein the outer valve body is disposed outside the packaging container, and the attachment portion further comprising a cylindrical portion that is continuous with and partially defines the passageway. The check valve is disposed within the cylindrical portion.

A valve structure according to a sixth aspect of the present invention is a valve structure according to any one of the first to fifth aspects, and the packaging container is a laminate container. The outer valve body includes a mounting portion that at least partially defines the passage and is fixed to the laminate container while being sandwiched between laminate films constituting the laminate container.

A package according to a seventh aspect of the present invention includes the valve structure according to any one of the first to sixth aspects, and the packaging container to which the valve structure is attached.

A package according to an eighth aspect of the present invention is a package according to the seventh aspect, in which when the internal pressure of the packaging container increases to a predetermined pressure that is 2/3 or less of the internal pressure resistance of the packaging container, It is constructed to allow the

A package according to a ninth aspect of the present invention is a package according to the seventh or eighth aspect, wherein the pressure difference between the internal pressure and the external pressure of the packaging container is 0.05 or more and 0.75 MPa or less. It is configured to release pressure when the pressure reaches .

A package according to a tenth aspect of the present invention is a package according to any of the seventh to ninth aspects, and the packaging container is a pouch.

A package according to an eleventh aspect of the present invention is a package according to any one of the seventh to tenth aspects, and the packaging container has an internal pressure resistance of 0.3 to 1 MPa.

A package according to a twelfth aspect of the present invention is a package according to any one of the seventh to eleventh aspects, wherein a vacuum is substantially formed in the packaging container before the start of use. .

A package according to a thirteenth aspect of the present invention is a package according to any one of the seventh to twelfth aspects, and the packaging container accommodates a battery element.

According to the present invention, the check valve is disposed within the passageway that communicates the inside and outside of the packaging container, and the moisture barrier mechanism is disposed on the secondary side, which is the side facing the outside of the check valve. Therefore, while the check valve allows gas to be vented when the internal pressure of the packaging container increases, the moisture barrier mechanism can prevent moisture from entering the packaging container.

FIG. 1 is a perspective view of a package including a valve structure and a packaging container according to an embodiment of the present invention. FIG. 3 is a side cross-sectional view showing the structure around the check valve and rupture valve according to the same embodiment. FIG. 3 is a top view of the rupture valve according to the same embodiment. FIG. 3A is a sectional view taken along line III-III in FIG. 3A. FIG. 7 is a side cross-sectional view showing a structure around a check valve and a moisture barrier mechanism according to a modified example. FIG. 7 is a side cross-sectional view showing a structure around a check valve and a moisture barrier mechanism according to another modification. FIG. 7 is a side cross-sectional view showing a structure around a check valve and a moisture barrier mechanism according to yet another modification. FIG. 7 is a side cross-sectional view showing a structure around a check valve and a moisture barrier mechanism according to yet another modification.

EMBODIMENT OF THE INVENTION Hereinafter, a valve structure and a package including the same according to an embodiment of the present invention will be described with reference to the drawings.

<1. Overall configuration of package>
FIG. 1 shows a perspective view of a package 101 according to this embodiment. As shown in the figure, a package 101 includes a valve structure 100 according to the present embodiment and a packaging container 200 to which the valve structure 100 is attached. In FIG. 1, parts that are normally not visible from the outside are partially shown with dotted lines for reference. Hereinafter, for convenience of explanation, the up-down direction in FIG. 1 will be referred to as "up-down" and the left-right direction will be referred to as "left-right", but the orientation and direction of the package 101 in use are not limited thereto.

Although the contents of the packaging container 200 are not particularly limited, the packaging body 101 is particularly good at accommodating contents that generate gas over time. The contents of the packaging container 200 can be, for example, coffee, fermented foods (miso, etc.), foods for long-term storage, etc., but the package 101 of this embodiment is a battery, especially a lithium ion secondary battery. , the packaging container 200 accommodates battery elements such as electrodes and electrolyte as contents.

The packaging container 200 is formed of, for example, a resin molded product or a film. The resin molded product mentioned here can be manufactured by injection molding, pressure molding, vacuum molding, blow molding, or the like, and in-mold molding may be performed to impart design and functionality. The type of resin can be PP, PET, nylon, ABS, etc. Furthermore, the film referred to here is, for example, a plastic film or metal foil that can be manufactured by a method such as an inflation method or a T-die method. Furthermore, the film referred to herein may or may not be stretched, and may be a single layer film or a laminated film. Furthermore, the laminated film referred to herein may be manufactured by a coating method, a plurality of films bonded together with an adhesive or the like, or a multilayer extrusion method.

The packaging container 200 is a laminate container in this embodiment. As the name suggests, laminate containers are made of laminate film. Further, the form of the laminate container is not particularly limited, and it can be made into a bag shape, but in this embodiment, the laminate film is formed into a concave shape, and the laminate film overlapped from above and an appropriate part (periphery) are formed. is heat sealed, thereby forming a heat sealed portion 201. The heat-sealed portion 201 forms an internal space of the packaging container 200 that is isolated from the external space. In addition, the aspect of heat sealing mentioned in this specification includes aspects such as heat welding from a heat source and ultrasonic welding. The laminate film can be a laminate in which a base layer, a barrier layer, and a heat-fusible resin layer are laminated in this order.

The valve structure 100 is configured to release gas generated inside the packaging container 200 to the outside as necessary, and to prevent the packaging container 200 from bursting due to internal pressure. Hereinafter, with the valve structure 100 as a reference, the side facing the inside of the packaging container 200 will be referred to as the primary side, and the side opposite to the primary side (the side facing the outside of the packaging container 200) will be referred to as the secondary side.

<2. Configuration of valve structure>
As shown in FIG. 1, the valve structure 100 includes an outer valve body 2 in which a passage L is formed. The valve outer body 2 has a cylindrical portion 20 and a mounting portion 22 . The attachment part 22 is a part for attaching the valve structure 100 to the packaging container 200. In this embodiment, the attachment part 22 is fixed to the packaging container 200 by being heat-sealed while being sandwiched between the laminate films forming the heat-sealing part 201 when the packaging container 200 is packaged. In FIG. 1, the position where the packaging container 200 is heat-sealed is indicated by diagonal hatching.

The attachment part 22 includes an annular part 23 whose central axis substantially coincides with the cylindrical part 20, and wing-shaped extension parts 24 and 24 extending leftward and rightward from the left and right ends of the annular part 23, respectively. Visually, it has a watery eye shape. The cylindrical portion 20 is a substantially cylindrical portion extending upward from the upper end of the attachment portion 22 . Although not limited thereto, in this embodiment, the cylindrical portion 20 and the attachment portion 22 are made of metal such as stainless steel, and are welded together after being molded as separate parts. However, the cylindrical portion 20 and the attachment portion 22 can also be configured integrally. In addition, when the attachment part 22 and the cylindrical part 20 are made into separate parts, both can be made of different materials. For example, the cylindrical part 20 can be made of stainless steel and the attachment part 22 can be made of hard resin. Can be done. The passage L is a passage having a substantially circular cross section that extends vertically through the attachment portion 22 and the cylindrical portion 20, and communicates the inside and outside of the packaging container 200.

A check valve 3 is arranged within the passage L. FIG. 2 is a side sectional view showing the structure around the check valve 3. As shown in FIG. The check valve 3 is configured to open when the pressure on its primary side increases, and to release gas from the primary side space to the secondary side space. A space R1 on the primary side of the check valve 3 in the passage L communicates with the inside of the packaging container 200, and the internal pressure of the space R1 matches the internal pressure of the packaging container 200. Space R1 and the inside of packaging container 200 form a closed space in which gas generated inside packaging container 200 is initially sealed. That is, the check valve 3 is configured to open when the internal pressure of the packaging container 200 increases due to gas generated inside the packaging container 200. The check valve 3 is a one-way valve that releases gas from the inside of the packaging container 200 to the outside according to the internal pressure of the packaging container 200. The check valve 3 is a return valve that allows repeated degassing.

As shown in FIG. 2, the passage L guides the gas generated within the packaging container 200 to the check valve 3. The structure of the check valve 3 is not particularly limited, and in this embodiment, it is of a ball spring type as shown in FIG. 2, but it may also be of a duckbill type, an umbrella type, etc., for example. The check valve 3 of this embodiment includes a valve seat 210, an O-ring 212, a ball 214, and a spring 216.

The valve seat 210 is arranged so as to protrude from the inner circumferential surface of the cylindrical portion 20 toward the inside of the passage L. The valve seat 210 defines an inverted cone-shaped space whose diameter increases upward in the passage L, and the space communicates with a space R1 on the primary side of the check valve 3. The valve seat 210 receives a ball 214 as a valve body urged from above by a spring 216, and at this time, the check valve 3 is in a closed state. The ball 214 contacts the lower end of the spring 216, and the upper end of the spring 216 is fixed to the inner peripheral surface of the cylindrical portion 20. Although the spring 216 is a leaf spring in the example of FIG. 2, it can also be a coil spring. The valve seat 210 can be made of metal such as stainless steel, for example, and can be configured integrally with the cylindrical portion 20 and the mounting portion 22. The O-ring 212 eliminates the gap between the ball 214 and the valve seat 210 when the ball 214 is seated on the valve seat 210, and helps improve the sealing performance in the closed state. The O-ring 212 is a hollow circular ring, and is made of, for example, fluororubber. The materials of the ball 214 and the spring 216 are not particularly limited, and for example, both can be made of metal such as stainless steel. Further, the ball 214 may be made of resin. Alternatively, one of the ball 214 and the valve seat 210 may be made of rubber, and the other may be made of Teflon (registered trademark) or metal such as stainless steel coated with Teflon (registered trademark).

Further, a space R2 is formed in the passage L on the secondary side of the check valve 3 (the side facing outside of the packaging container 200 from the position where the valve seat 210 and the ball 214 contact). When the internal pressure of the packaging container 200, that is, the internal pressure of the space R1 on the primary side of the check valve 3, reaches a predetermined pressure, the gas induced from inside the packaging container 200 presses the ball 214 upward. When the ball 214 is pressed and separated from the valve seat 210, the spring 216 is deformed, and the contact area between the spring 216 and the ball 214 moves upward, forming the open state of the check valve 3. In this open state, gas generated inside the packaging container 200 flows out into the space R2 through the gap formed between the ball 214 and the O-ring 212. As a result, when the gas in the space R1 is discharged and the force pressing the ball 214 upward weakens, the force with which the spring 216 urges the ball 214 downward becomes larger, and the shape of the spring 216 changes. Restore. As a result, the check valve 3 is closed again.

A rupture valve 1 is arranged on the secondary side of the check valve 3. More specifically, a flange portion 21 is formed on the inner peripheral surface of the upper end of the cylindrical portion 20, and the upper surface of the flange portion 21 is welded to the outer peripheral edge of the rupture valve 1. The rupture valve 1 is made of metal such as aluminum and has a substantially disk shape. The rupture valve 1 is arranged to close the passage L and seal the space R2 from the outside space. The flange portion 21 is an inner flange, and the outer diameter of the rupture valve 1 is larger than the inner diameter of the flange portion 21, and in this embodiment, is approximately the same size as the outer diameter of the flange portion 21. Note that the rupture valve 1 may be fixed to the lower surface of the flange portion 21.

The rupture valve 1 is configured to rupture and release gas from the primary side space to the secondary side space when the pressure on its primary side increases. That is, the rupture valve 1 ruptures when gas generated inside the packaging container 200 passes through the check valve 3 and accumulates in the secondary side space R2, thereby increasing the internal pressure of the space R2. It is configured to emit gas to an external space.

The rupture valve 1 prevents gas and liquid communication in the pre-rupture state. That is, the rupture valve 1 functions as a moisture barrier mechanism that prevents the atmosphere and the moisture contained therein from entering the packaging container 200 from the outside to the inside.

FIG. 3A is a top view of the rupture valve 1. A notch 10 having a substantially Y-shape is formed on the upper surface of the rupture valve 1 . FIG. 3B is a cross-sectional view taken along line III-III in FIG. 3A. As shown in FIG. 3B, the notch 10 is formed symmetrically on the upper and lower surfaces of the rupture valve 1, and the thickness W1 of the notch 10 is thinner than the thickness W2 of the other portion of the rupture valve 1. In other words, the notch portion 10 has relatively lower strength than other portions of the rupture valve 1, and is a region where stress is concentrated when the pressure on the primary side of the rupture valve 1 increases. As a result, when a pressure above a certain level is applied to the rupture valve 1 as the internal pressure of the space R2 increases, a rupture occurs from the notch 10, and the rupture valve 1 is torn open. The opening pressure of the rupture valve 1 is the pressure at which the rupture valve 1 ruptures (the pressure difference between the primary side and the secondary side), and is appropriately realized by parameters such as the shape of the notch 10, the thickness W1, and the material. be able to. Note that the term "cleavage" here refers to a state in which the primary side and the secondary side of the rupture valve 1 are in communication with gas and liquid due to the material constituting the rupture valve 1 being severed. do.

As described above, in this embodiment, the rupture valve 1 is arranged on the secondary side of the check valve 3. Although the check valve 3 can be said to be a one-way valve, it cannot completely prevent backflow by itself. Therefore, it is difficult to completely prevent atmospheric air from entering the packaging container 200 using only the check valve 3, and battery deterioration may occur. In this regard, in this embodiment, the existence of the rupture valve 1 sufficiently prevents the air from entering the packaging container 200 before the rupture valve 1 is torn, thereby preventing deterioration of the battery due to moisture contained therein. It can be effectively prevented.

Further, the rupture valve 1 is torn open after the check valve 3 has been operated at least once. Therefore, after the rupture valve 1 is ruptured, the internal pressure of the space R1 on the primary side of the check valve 3 is maintained at a relatively high state, so that even a slight backflow through the check valve 3 is difficult to occur. A condition arises. Therefore, even after the rupture valve 1 is ruptured, the action of the check valve 3 prevents the atmosphere from entering the packaging container 200, and effectively prevents the battery from deteriorating due to the moisture contained therein. can. Therefore, even after the rupture valve 1 is torn open, the package 101, which is a battery, can be used continuously.

Furthermore, the package 101 of this embodiment is a battery, and a vacuum is substantially formed in the packaging container 200 immediately after manufacture and before use. Here, due to the above-mentioned problem of atmospheric backflow, it is difficult to evacuate the inside of the packaging container 200 even if the rupture valve 1 is not present and only the check valve 3 is configured. In this regard, in this embodiment, the presence of the rupture valve 1 makes it possible to easily perform such evacuation.

Furthermore, in this embodiment, the check valve 3 and the rupture valve 1 are arranged not in the attachment part 22 but in the cylindrical part 20. As a result, the possibility that the various parts constituting the check valve 3 and the rupture valve 1 will be deformed by the heat generated when attaching the attachment part 22 to the packaging container 200 by heat sealing is reduced.

The opening pressure of the check valve 3 is preferably greater than the opening pressure of the rupture valve 1. In the opposite case, the internal pressure in the secondary space R2 increases because the rupture valve 1 does not burst open easily, but at this time, the check valve 3, which is activated by the differential pressure between the primary and secondary sides, This is because there is a possibility that the container 200 will not be able to operate until the internal pressure of the container 200 increases further. Note that, similarly to the rupture valve 1, the opening pressure of the check valve 3 is also the pressure (pressure difference between the primary side and the secondary side) at which the check valve 3 opens.

The internal pressure resistance of the packaging container 200 is preferably 0.3 MPa or more. In this case, the packaging container 200 is prevented from bursting due to unexpected causes such as vibration. Moreover, the internal pressure resistance of the packaging container 200 can be 1 MPa or less. In this case, it is possible to prevent malfunctions in internal parts of the battery due to a large amount of gas generated within the packaging container 200. In addition, the internal pressure resistance of the packaging container 200 is defined as a state in which the packaging container 200 remains airtightly sealed when the valve structure 100 is omitted and the mounting position of the valve structure 100 is heat-sealed in the same way as the surrounding area. This means the maximum internal pressure of the packaging container 200 that can be achieved. Here, the internal pressure of the packaging container 200 is expressed as a difference from atmospheric pressure. Furthermore, when pressure is expressed numerically, unless otherwise specified, it is assumed that the pressure is measured in an environment of 25°C.

Moreover, the packaging body 101 is configured such that when the internal pressure of the packaging container 200 rises to a predetermined pressure that is 2/3 or less of the internal pressure resistance of the packaging container 200, the rupture valve 1 is torn open and the pressure is released to the external space. Preferably, it is configured. In this case, degassing by the valve structure 100 can be more reliably realized before the packaging container 200 ruptures.

Furthermore, in the packaging body 101, the rupture valve 1 is torn when the pressure difference between the internal pressure and the external pressure (pressure in the external space) of the packaging container 200 reaches a predetermined pressure of 0.05 MPa or more and 0.75 MPa or less. However, it is preferable that the pressure is released to an external space. If the rupture valve 1 ruptures when the pressure difference between the internal pressure and the external pressure of the packaging container 200 is 0.05 MPa or less, there is a possibility that the rupture valve 1 ruptures with a slight vibration, and if the rupture valve 1 ruptures when the pressure difference between the internal pressure and the external pressure of the packaging container 200 is 0.75 MPa or more. This is because when the valve structure 100 is opened, deformation around the valve structure 100 becomes large, and the electrodes may be short-circuited.

The opening pressure of the rupture valve 1 is preferably 0.05 to 0.75 MPa. The opening pressure of the check valve 3 is preferably 0.05 to 0.75 MPa. Further, the opening pressure of the rupture valve 1 is preferably the same as or lower than the opening pressure of the check valve 3. When the internal pressure resistance of the laminate container 200 exceeds 1 MPa in a high temperature environment of 100° C., the opening pressure of the rupture valve 1 is preferably 2/3 or less of 1 MPa. This is because if the opening pressure of the rupture valve 1 exceeds 2/3 of 1 MPa, even if the laminated container 200 does not break, the electrodes will be deformed due to deformation, causing problems such as short circuits.

<3. Operation of valve structure>
Hereinafter, the usage state of the valve structure 100 will be explained. The valve structure 100 is used while being airtightly attached to the packaging container 200.

As already mentioned, the package 101 is a battery, and the packaging container 200 accommodates an electrolyte. The electrolyte may vaporize or decompose for some reason. When gas is generated inside the packaging container 200 due to vaporization or decomposition of the electrolytic solution, the internal pressure of the space R1 increases. Then, when the internal pressure of the space R1 (differential pressure with the space R2) increases and reaches the opening pressure of the check valve 3, the check valve 3 opens. When the check valve 3 opens, the space R1 and the space R2 communicate with each other, allowing gas to escape into the space R2, which was originally a closed space. As a result, the internal pressure applied to the packaging container 200 decreases, and the check valve 3 returns to the closed state.

When the check valve 3 is repeatedly opened once or multiple times and the internal pressure of the space R2 rises to reach the opening pressure of the rupture valve 1, the rupture valve 1 is torn open. Thereby, the space R2 communicates with the external space, and the gas in the space R2 is released to the external space.

Once the rupture valve 1 is ruptured, it no longer performs its function. However, since the check valve 3 is present on the secondary side of the rupture valve 1, there is no communication between the inside and outside of the packaging container 200, making it difficult for the atmosphere and moisture contained therein to enter into the packaging container 200. continue. Therefore, even after the rupture valve 1 is torn open, the package 101, which is a battery, can be continued to be used.

<4. Modified example>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit thereof. For example, the following changes are possible. Furthermore, the gist of the following modifications can be combined as appropriate.

<4-1>
In the above embodiment, the rupture valve 1 is a metal plate member in which the notch 10 is formed, but the configuration of the rupture valve 1 is not limited to this aspect. For example, the rupture valve 1 may be constructed of a laminate film whose outer periphery is heat-sealed to the upper end of the valve outer body 2. In this example, as in the above embodiment, when the pressure on the primary side of the laminate film, which is the rupture valve 1, increases due to the gas generated inside the packaging container 200, the laminate film peels off (opens). configured. Further, as shown in FIG. 4, a pouch 1a may be attached to the cylindrical portion 20 of the valve outer body 2 to seal its internal space from the external space. This example is also configured so that when the pressure inside the pouch 1a increases due to the gas generated inside the packaging container 200, the pouch 1a peels off (opens). As described above, the rupture valve can also be preferably formed by easy peel.

<4-2>
In the above embodiment, instead of the rupture valve 1, a waterproof liquid layer 1b may be arranged on the secondary side of the check valve 3, as shown in FIG. In this case, for example, an oil can be used as the waterproof liquid, which is permeable to gases but not to liquids. For example, as shown in FIG. 5, the waterproof liquid layer 1b is formed by arranging membranes 1c that allow gas but not liquid to pass through the passage L at two locations along the direction in which the passage L extends. It can be formed by containing a waterproof liquid between them. As such a membrane 1c, for example, a nonwoven fabric made of fluorine or coated with fluorine, or Gore-Tex (registered trademark) cloth can be used. In this modification, the waterproof liquid layer 1b is superior in that it is difficult to be destroyed by an increase in the internal pressure of the space R2 because it allows gas to pass therethrough. Furthermore, unlike a rupture valve, there is no need to set pressure, so gas can be released to the outside by controlling the pressure of the check valve alone. On the other hand, since the waterproof liquid layer 1b does not allow liquid to pass through, it can function as a moisture barrier mechanism that prevents the atmosphere and moisture contained therein from entering the packaging container 200 from the outside. Note that a layer 1b of waterproof liquid can also be arranged together with the rupture valve 1. In this case, it is preferable to arrange a waterproof liquid layer 1b on the secondary side of the rupture valve 1.

<4-3>
In the above embodiment, both the rupture valve 1 and the check valve 3 are arranged in the cylindrical part 20, but only the check valve 3 or both the rupture valve 1 and the check valve 3 are arranged in the mounting part 22. may be placed. Alternatively, the teardrop-shaped attachment portion 22 may be omitted and the packaging container 200 may be fixed to the outer circumferential surface of the cylindrical portion 20 by heat sealing while the rupture valve 1 and the check valve 3 are placed within the cylindrical portion 20. It's okay.

<4-4>
As shown in FIG. 6A, for example, a diaphragm type accumulator 4 may be arranged within the space R1 on the primary side of the check valve 3 or in communication therewith. In this case, the volume for storing gas in the space R1 can be increased.

Alternatively or additionally, as shown in FIG. 6B, for example, a diaphragm type An accumulator 4 may be arranged. In this case, the volume for storing gas on the primary side of the rupture valve 1 can be increased. On the other hand, when the rupture valve 1 is activated and the gas escapes to the external space, the gas stored in the accumulator 4 is also released to the external space.

Alternatively or additionally, as shown in FIG. 6B, on the primary side of the waterproof liquid layer 1b, in or in communication with the space R2 on the secondary side of the check valve 3, For example, a diaphragm type accumulator 4 may be provided. In this case, the volume for storing gas on the secondary side of the check valve 3 can be increased, so the gas flows out from the check valve 3 into the space R2 at once, and if only the space R2 is used, the waterproof liquid layer 1b is It is also possible to deal with situations where the gas cannot be discharged quickly enough. The gas stored in the accumulator 4 is gradually released to the outside space.

1 Release valve (moisture barrier mechanism)
1a Pouch (rupture valve, moisture barrier mechanism)
1b Waterproof liquid layer (moisture barrier mechanism)
2 Valve outer body 3 Check valve 4 Cumulator 200 Packaging container L Passage

Claims (1)

A valve structure attached to a packaging container, the valve structure comprising:
an outer valve body having a passage formed therein that communicates the inside and outside of the packaging container;
a check valve disposed within the passage;
and a moisture barrier mechanism disposed on a secondary side, which is a side facing outside, of the check valve so as to close the passage.