WO2022176558A1

WO2022176558A1 - Gas vent valve and gas vent valve sheet

Info

Publication number: WO2022176558A1
Application number: PCT/JP2022/003101
Authority: WO
Inventors: 賢一加島
Original assignee: 大塚テクノ株式会社
Priority date: 2021-02-18
Filing date: 2022-01-27
Publication date: 2022-08-25
Also published as: JP2022126149A

Abstract

This gas vent valve includes: a base film in which a ventilation hole for gas ventilation is formed; a cover film which is layered on the base film so as to cover the ventilation hole, is composed of linear low-density polyethylene, and is adhered to the base film by a pair of first adhesion sites that oppose each other in a first direction across the ventilation hole; a gas discharge path, which is formed at a site sandwiched by the pair of first adhesion sites between the base film and the cover film, is formed along a second direction intersecting the first direction so as to overlap the ventilation hole, and has a first end and a second end opposite thereto in the second direction, at least one of the first end and the second end being an open end of the gas discharge path; and a second adhesion site which is disposed on the open end side with respect to the ventilation hole in the gas discharge path, and is formed by partial adhesion between the cover film and the base film.

Description

Vent valve and vent valve seat

The present disclosure relates to a gas vent valve for a packaging container that can be attached to the outer surface of a soft packaging material of the packaging container, and a gas vent valve seat including the gas vent valve.

For example, Patent Document 1 discloses an overpressure valve arranged on the inner surface of the packaging material wall of the packaging container. The overpressure valve comprises a base plate having at least one penetration, a valve diaphragm overlapping the at least one penetration and at least partially connected to the base plate, and a space arranged on the side of the base plate facing the packaging material wall. a layer;

In this overpressure valve, the spacing layer is bonded to the inner surface of the packaging material wall, the base plate, the valve diaphragm and the spacing layer being of the type each consisting of a layer of plastic sheet web. A spacing layer is at least partially connected directly to the base plate, and a gap is formed at least partially on the edge side between the valve diaphragm and the spacing layer. The valve diaphragm has at least one connecting area molded onto the valve diaphragm for connecting the valve diaphragm to the base plate. A valve diaphragm, including at least one bonding area, is arranged inside the inner contour bounded by the spacing layer. The connecting region is formed as a projection on the outer contour of the valve diaphragm, the surface of the projection facing the base plate being applied with an adhesive layer.

Japanese Patent No. 5054302

In the overpressure valve of Patent Document 1, the through portion of the base plate is exposed inside the packaging container. Therefore, when the diaphragm is pushed up by the overpressure inside the packaging container and the gas is discharged, powdered materials such as coffee stored in the packaging container may be discharged together with the gas through the penetration part.

However, when the gas discharge is completed and the diaphragm returns to its normal state (diaphragm closed state), the powder material remaining between the base plate and the diaphragm may get caught in the diaphragm. As a result, even after the gas is discharged, the diaphragm is in a state of being slightly floated, and there is a risk that it will not be possible to ensure air isolation between the inside and the outside of the packaging container.

Therefore, a gas vent valve according to an embodiment of the present disclosure provides a gas vent valve for a packaging container that can satisfactorily ensure air isolation between the inside and outside of the packaging container.

A vent valve according to one embodiment of the present disclosure is a vent valve for a packaging container attachable to an outer surface of a flexible packaging material of the packaging container, the vent valve having a first side and an opposite second side, a base film having a vent hole for venting gas penetrating from the first surface to the second surface, the second surface being adhered to the flexible packaging material; and the base film covering the vent hole. a cover film laminated on the first surface, made of linear low-density polyethylene, and adhered to the base film by a pair of first adhesion sites facing each other in the first direction with the air hole interposed therebetween; A gas discharge path is formed along a second direction intersecting the first direction so as to overlap the ventilation hole at a portion sandwiched between the pair of first bonding portions between the base film and the cover film. having a first end and a second end opposite thereto in the second direction, wherein at least one of the first end and the second end is an open end of the gas discharge passage a gas exhaust path; and a second adhesive portion disposed on the open end side of the air vent in the gas exhaust path and formed by partially bonding the cover film and the base film. .

FIG. 1 is a perspective view showing an attached state of a gas vent valve according to one embodiment of the present disclosure. FIG. 2 is a schematic perspective view of the gas vent valve. FIG. 3 is a schematic plan view of the gas vent valve. FIG. 4 is a schematic cross-sectional view of the gas vent valve, showing a cross section taken along line IV-IV in FIG. FIG. 5 is a schematic cross-sectional view of the gas vent valve, showing a cross section taken along line VV in FIG. FIG. 6 is a schematic cross-sectional view of the gas vent valve, showing a cross section taken along the line VI--VI in FIG. FIG. 7 is a schematic cross-sectional view of the gas vent valve, showing a cross section taken along line VII--VII in FIG. FIG. 8 is a schematic cross-sectional view of the gas vent valve, showing a cross section taken along line VIII-VIII in FIG. FIG. 9 is a schematic exploded view of the gas vent valve. 10A and 10B are diagrams showing how gas is vented through the gas vent valve. 11A and 11B are diagrams showing how gas is vented through the gas vent valve. 12A and 12B are diagrams showing a state in which powder particles are sandwiched between the base film and the cover film. 13A and 13B are diagrams showing part of the manufacturing process of the gas vent valve. Figures 14A and 14B are diagrams illustrating the steps following Figures 13A and 13B. Figures 15A-15C are diagrams illustrating the next steps of Figures 14A and 14B. Figures 16A-16C are diagrams showing the steps following Figures 15A-15C. Figures 17A-17C are diagrams illustrating the steps following Figures 16A-16C. Figures 18A-18C are diagrams showing the steps following Figures 17A-17C. FIG. 19 is a schematic perspective view showing a gas vent valve seat having a plurality of the gas vent valves. FIG. 20 is a schematic perspective view showing a modified example of the gas vent valve. FIG. 21 is a schematic plan view showing a modification of the gas vent valve. FIG. 22 is a schematic plan view showing a modification of the gas vent valve.

<Embodiment of the Present Disclosure>
First, embodiments of the present disclosure will be listed and described.

For example, the gas vent valve is attached to the soft packaging material so as to cover the gas vent through hole formed in the packaging container. When the inside of the packaging container is overpressured, the internal pressure acts on the cover film through the through hole of the packaging container and the vent hole of the gas vent valve. When the internal pressure of the packaging container reaches a predetermined pressure or higher and the pressure acting on the cover film increases, the cover film fixed by the pair of first adhesive portions is partially lifted from the base film. As a result, the space between the vent hole and the open end of the gas discharge path is opened, and the gas generated inside the packaging container is discharged to the outside. After that, when the internal pressure of the packaging container becomes less than the predetermined pressure, the cover film returns to its original state. As a result, the gas discharge path is closed, and air from the outside to the packaging container is cut off.

According to this gas vent valve, the cover film is made of linear low-density polyethylene and has flexibility. Therefore, the cover film can be deformed with a relatively small pressure, so the gas can be easily discharged. Further, even if the powder material is sandwiched between the cover film and the base film in the gas discharge path, the cover film deforms along the shape of the particles so as to wrap the particles of the powder material. This can prevent the cover film from floating over a wide area with respect to the base film. As a result, the inflow of outside air into the packaging container can be suppressed satisfactorily.

Also, a second adhesive portion is partially formed in the gas exhaust path. As a result, for example, even if force is applied to the gas vent valve from both sides in the first direction (for example, left and right sides of the gas vent valve) and the gas vent valve is bent, the cover film is prevented from floating with respect to the base film. be able to. As a result, the check function of the gas vent valve can be maintained satisfactorily.

In the gas vent valve according to an embodiment of the present disclosure, the base film includes a base layer, a first adhesive layer laminated on the first surface side of the base layer, and the first adhesive layer and a first release layer that is detachably laminated on the first release layer, and a part of the first adhesive layer serves as the pair of first adhesion sites sandwiching the first release layer in the first direction. The cover film straddles the first release layer and is adhered to the first adhesive layer as the pair of first adhesion sites, and the gas is present between the first release layer and the cover film. You may form the discharge channel.

According to this configuration, a step corresponding to at least the thickness of the first peeling layer is formed between the surface of the first peeling layer and the surface of the first adhesive layer. As a result, the region (first release layer) for the gas discharge path in the base film is convex with respect to the first adhesive layer. Therefore, the cover film can be adhered to the first adhesive layer exposed from both sides of the first release layer in a stretched state. As a result, the adhesion between the cover film and the base film can be improved, so that the check function of the gas vent valve can be further improved.

A gas vent valve according to an embodiment of the present disclosure may include a sealing fluid layer formed between the first release layer and the cover film.

According to this configuration, the sealing fluid layer can improve the adhesion between the cover film and the base film, so that the check function of the gas vent valve can be improved. In addition, as described above, the adhesion between the cover film and the base film is also improved by applying tension to the cover film, so even if the amount of the sealing fluid layer is small, the effect of improving the adhesion can be sufficiently obtained. can enjoy.

In the gas vent valve according to one embodiment of the present disclosure, the first surface of the base film is formed with a first region in which the gas discharge path is formed, and the pair of first adhesion sites. and a pair of second regions sandwiching the first region in a direction and recessed toward the second surface side with respect to the first region, wherein the cover film straddles the first region, It is adhered to the base film in two regions, forms the gas discharge path with the first region, and includes a sealing fluid layer formed between the first region and the cover film. You can stay.

According to this configuration, a step corresponding to at least the depression of the second region is formed between the surface of the first region and the surface of the second region (first bonding portion). Thereby, in the base film, the first area for the gas discharge path is convex with respect to the second area (first adhesion portion). Therefore, the cover film can be adhered in a stretched state to the pair of first adhesion sites on both sides of the first region. As a result, the adhesion between the cover film and the base film can be improved, so that the check function of the gas vent valve can be further improved.

In addition, since the sealing fluid layer can improve the adhesion between the cover film and the base film, the check function of the gas vent valve can be improved. In addition, as described above, the adhesion between the cover film and the base film is also improved by applying tension to the cover film, so even if the amount of the sealing fluid layer is small, the effect of improving the adhesion can be sufficiently obtained. can enjoy.

A gas vent valve according to an embodiment of the present disclosure may include a pair of auxiliary films selectively formed in regions above the pair of first adhesion sites in the cover film.

For example, when a plurality of packaging containers are stacked and stored, the cover film may be pressed against the base film at the degassing valve due to the adjoining packaging containers coming into close contact with the degassing valve. As a result, even if the internal pressure of the packaging container reaches a predetermined pressure or higher, the gas discharge path may not be opened and the gas inside the packaging container may not be discharged. Therefore, by providing the auxiliary film, the auxiliary film intervenes between the adjacent packaging container and the cover film. Thereby, it can suppress that a cover film is pressed by a packaging container.

In the gas vent valve according to an embodiment of the present disclosure, both the first end and the second end of the gas discharge channel are the open ends, and the second adhesive portion is the base film and A pair of second adhesive sites may be included that partially closes the first end and the second end such that an adhesive boundary with the cover film is exposed from the end face of the gas vent valve.

In the gas vent valve according to an embodiment of the present disclosure, the vent hole is formed in a perfect circular shape in plan view, and each of the pair of second adhesion sites is larger than the diameter of the vent hole in plan view. may be formed in a semicircular shape with a smaller diameter.

In the gas vent valve according to one embodiment of the present disclosure, the linear low-density polyethylene may have a density of 0.910 g/cm ³ or more and 0.930 g/cm ³ or less.

A vent valve according to one embodiment of the present disclosure is a vent valve for a packaging container attachable to an outer surface of a flexible packaging material of the packaging container, the vent valve having a first side and an opposite second side, a base film having a vent hole for venting gas penetrating from the first surface to the second surface, the second surface being adhered to the flexible packaging material; and the base film covering the vent hole. Laminated on the first surface, made of a resin material having a Young's modulus of 10 MPa or more and 25 MPa or less, and adhered to the base film by a pair of first adhesion portions facing each other in the first direction with the air hole interposed therebetween. Formed along a second direction intersecting the first direction so as to overlap the vent hole at a portion between the cover film and the pair of first adhesion portions between the base film and the cover film. having a first end and a second end opposite thereto in the second direction, wherein at least one of the first end and the second end is the gas discharge passage and a second gas discharge path, which is an open end of the gas discharge path, is disposed on the open end side of the gas discharge path with respect to the air hole, and is formed by partially bonding the cover film and the base film. An adhesion site may also be included.

For example, the gas vent valve is attached so as to cover the gas vent through-hole formed in the packaging container. When the inside of the packaging container is overpressured, the internal pressure acts on the cover film through the through hole of the packaging container and the vent hole of the gas vent valve. When the internal pressure of the packaging container reaches a predetermined pressure or higher and the pressure acting on the cover film increases, the cover film fixed by the pair of first adhesive portions is partially lifted from the base film. As a result, the space between the vent hole and the open end of the gas discharge path is opened, and the gas generated inside the packaging container is discharged to the outside. After that, when the internal pressure of the packaging container becomes less than the predetermined pressure, the cover film returns to its original state. As a result, the gas discharge path is closed, and air from the outside to the packaging container is cut off.

According to this gas vent valve, the cover film is made of a resin material having a Young's modulus of 10 MPa or more and 25 MPa or less, and has flexibility. Therefore, the cover film can be deformed with a relatively small pressure, so the gas can be easily discharged. Further, even if the powder material is sandwiched between the cover film and the base film in the gas discharge path, the cover film deforms along the shape of the particles so as to wrap the particles of the powder material. This can prevent the cover film from floating over a wide area with respect to the base film. As a result, the inflow of outside air into the packaging container can be suppressed satisfactorily.

In the gas vent valve according to one embodiment of the present disclosure, the resin material may contain at least one of linear low-density polyethylene and thermoplastic elastomer.

In the gas vent valve according to one embodiment of the present disclosure, the base film may include a back adhesive layer laminated on the second surface side.

A gas vent valve sheet according to an embodiment of the present disclosure includes a mount film and a plurality of the gas vent valves arranged detachably from the mount film via the back surface adhesive layer.

According to this configuration, for example, the gas vent valve seat can be leaned or stored in a file, so that a plurality of gas vent valves can be easily stored.
<Detailed Description of Embodiments of the Present Disclosure>
Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.
[Overall shape of packaging container 2]
FIG. 1 is a perspective view showing an attached state of a gas vent valve 1 according to an embodiment of the present disclosure.

The gas vent valve 1 is attached to the packaging container 2 as shown in FIG. Thereby, the quality of the food in the packaging container 2 is maintained.

The packaging container 2 is, for example, a flexible bag made of a plastic resin composite (laminate) film, and has an outer surface 3 and an inner surface 4 (see FIGS. 10A, 10B and FIGS. 11A, 11B) of a soft packaging material 21. is doing. A vent valve 1 is attached to the outer surface 3 of the packaging container 2 . The flexible packaging material 21 is a film-like material that constitutes the packaging container 2. For example, if it is relatively thin (for example, the thickness is less than 250 μm), it may be called a packaging material film. (For example, a thickness of 250 μm or more) may be referred to as a packaging material sheet. It should be noted that in the present disclosure, the configurations including "film" and "sheet" are not limited to "having a thickness of less than 250 μm" and "having a thickness of 250 μm or more", respectively.

For example, foods that generate gas during storage are hermetically stored inside the packaging container 2 . Examples of such foods include coffee and the like. Gas generated from the food is discharged outside the packaging container 2 through the gas vent valve 1 . Coffee may be in the form of roasted coffee beans or in the form of powder obtained by grinding roasted coffee beans (regular coffee).

Note that the packaging container 2 may be called a packaging bag because its constituent material is a film. Moreover, the inside of the packaging container 2 may be in a vacuum state, or may be in a state in which some air exists.
[Overall shape of gas vent valve 1]
FIG. 2 is a schematic perspective view of the gas vent valve 1. FIG. FIG. 3 is a schematic plan view of the gas vent valve 1. FIG. FIG. 4 is a schematic cross-sectional view of the gas vent valve 1, showing a cross section taken along line IV-IV in FIG. FIG. 5 is a schematic cross-sectional view of the gas vent valve 1, showing a cross section taken along line VV in FIG. FIG. 6 is a schematic cross-sectional view of the gas vent valve 1, showing a cross section taken along the line VI--VI in FIG. FIG. 7 is a schematic cross-sectional view of the gas vent valve 1, showing a cross section taken along line VII--VII in FIG. FIG. 8 is a schematic cross-sectional view of the gas vent valve 1, showing a cross section taken along line VIII-VIII in FIG. FIG. 9 is a schematic exploded view of the gas vent valve 1. As shown in FIG.

With reference to FIGS. 2 and 3, the gas vent valve 1 is formed in a generally square shape (for example, a square shape with four rounded corners) in plan view. The size of the gas vent valve 1 (vertical length L1×horizontal width W1) may be, for example, 15 mm×15 mm or more and 25 mm×25 mm or less (specifically, about 20 mm×20 mm). The gas vent valve 1 has a pair of end faces 1A (edges) facing each other and a pair of end faces 1B orthogonal to the pair of end faces 1A. A pair of end faces 1A and a pair of end faces 1B form the outline of the gas vent valve 1. As shown in FIG. In this embodiment, the direction parallel to the pair of end faces 1A is defined as the first direction X, the direction parallel to the pair of end faces 1B is defined as the second direction Y, and the thickness direction of the gas vent valve 1 (first A direction orthogonal to the direction X and the second direction Y) is defined as a third direction Z. Also, the second direction Y may be defined as the gas discharge direction.

The gas vent valve 1 includes a base film 5, a cover film 6, a sealing fluid layer 7 (not shown in FIG. 9), and an auxiliary film 8.

The base film 5 has, for example, a first surface 9 and a second surface 10 opposite thereto. The base film 5 may consist of a plastic film having adhesive layers on both the first side 9 and the second side 10 . The base film 5 may have a thickness of, for example, 50 μm or more and 200 μm or less (specifically, about 150 μm).

In this embodiment, referring to FIGS. 4 to 8, the base film 5 is a double-sided adhesive film comprising a substrate layer 11, a first adhesive layer 12, a first release layer 13, and a back adhesive layer 14. is. The first adhesive layer 12 and the first peeling layer 13 are laminated in this order on the first surface 9 side of the base material layer 11 . The back adhesive layer 14 is laminated on the second surface 10 side of the base material layer 11 . The back adhesive layer 14 may be referred to as a second adhesive layer.

Examples of the base material layer 11 include plastic materials such as PET (polyethylene terephthalate), PC (polycarbonate), and PP (polypropylene). The thickness of the base material layer 11 may be, for example, 50 μm or more and 100 μm or less (specifically, about 75 μm). Examples of the first adhesive layer 12 and the back adhesive layer 14 include an adhesive material such as an acrylic adhesive. Examples of the first release layer 13 include a plastic material such as PET. The thickness of the first peeling layer 13 may be, for example, 10 μm or more and 40 μm or less (specifically, about 25 μm). Specific commercial products of the double-sided adhesive film such as the base film 5 include, for example, Neo Fix manufactured by Nichiei Shinka Co., Ltd. and the like.

In this embodiment, the base film 5 is formed in a substantially quadrangular ring shape having a vent hole 16 for venting gas in the central portion. Vent 16 is circular in this embodiment. Referring to FIG. 9, the size of the base film 5 (vertical length L2×horizontal width W2) is the same as the size of the gas vent valve 1, for example, 15 mm×15 mm or more and 25 mm×25 mm or less (specifically may be about 20 mm×20 mm). A diameter D1 of the air hole 16 may be, for example, 5 mm or more and 10 mm or less (specifically, about 8 mm).

With reference to FIG. 9 , in the base film 5 , a portion of the first adhesive layer 12 is exposed from the first peeling layer 13 by selectively peeling the first peeling layer 13 . The first adhesive layer 12 is exposed as an independent adhesive site for each region where the first peeling layer 13 is peeled off. In this embodiment, the first adhesive layer 12 forms a pair of first adhesive sites 17 and a pair of second adhesive sites 18 .

The pair of first adhesive portions 17 are formed in a belt shape extending from one end face 1A of the gas vent valve 1 to the other end face 1A along the end face 1B. As a result, the remaining belt-like portion of the first release layer 13 including the area where the air holes 16 are formed is sandwiched between the pair of first adhesive portions 17 . A width W4 of the first release layer 13 in the first direction X may be greater than a width W5 of the first adhesive portion 17 . For example, the width W4 may be approximately 11 mm and the width W5 may be approximately 4.5 mm.

Each first adhesion site 17 is spaced apart from the air hole 16 in the first direction X. Therefore, on both sides of the air hole 16 in the first direction X, part of the first peeling layer 13 remains as blank portions 19 . This blank portion 19 provides tack-free properties between the cover film 6 and the base film 5 around the air vent 16 . As a result, the cover film 6 can be separated from the base film 5 over the entire periphery of the vent hole 16, so that a gas discharge path 28 (described later) can be opened with a relatively small pressure.

4 to 6, on the first surface 9 of the base film 5, between the surface of the first release layer 13 and the surface of the first adhesive layer 12 forming the first adhesive portion 17, a first adhesive layer 12 is formed. A one step 20 is formed. The first step 20 is generated by peeling of the first peeling layer 13 and corresponds to at least the thickness of the first peeling layer 13 . Due to this first step 20 , the first release layer 13 of the base film 5 is convex with respect to the first adhesive layer 12 . In other words, the first release layer 13 is selectively laminated in islands on the first adhesive layer 12 such that around the first release layer 13 a portion of the first adhesive layer 12 is the first adhesive layer 12 . It may be exposed as the adhesion portion 17 . Further, referring to FIG. 9 , in the base film 5 , the convex region on which the first release layer 13 is formed is defined as the first region 22 . Alternatively, the region forming the pair of first bonding sites 17 may be defined as the second region 23 .

Note that if the laminated structure including the first adhesive layer 12 and the first peeling layer 13 is not formed on the base material layer 11, the first step 20 may be formed by another method. For example, the base material layer 11 having a striped uneven structure corresponding to the first region 22 and the second region 23 may be molded, and an adhesive material (adhesive material) may be formed on the second region 23 by coating or the like. .

A pair of second adhesion sites 18 are formed on one end surface 1A and the other end surface 1A side of the gas vent valve 1 with respect to the vent hole 16 . In this embodiment, the pair of second adhesion sites 18 are formed in the vicinity of one end face 1A and the other end face 1A of the gas vent valve 1 . As a result, each second bonding site 18 is spaced apart from the air hole 16 in the second direction Y. As shown in FIG. Also, the pair of second bonding sites 18 may be formed in a semicircular shape that is open at one end surface 1A and the other end surface 1B. The diameter D2 of each second adhesive site 18 may be smaller than the diameter D1 of the vent hole 16 . For example, the diameter D2 may be approximately 4 mm.

Referring to FIG. 7, on the first surface 9 of the base film 5, a second step 24 is provided between the surface of the first release layer 13 and the surface of the first adhesive layer 12 forming the second adhesive portion 18. is formed. The second step 24 is generated by peeling of the first peeling layer 13 and corresponds to at least the thickness of the first peeling layer 13 . Due to this second step 24 , the first release layer 13 of the base film 5 is convex with respect to the first adhesive layer 12 . Further, referring to FIG. 9 , in the base film 5 , the convex region on which the first release layer 13 is formed is defined as the first region 22 . Alternatively, the third region 25 may be defined as the region forming the pair of second adhesive sites 18 .

The cover film 6 has, for example, a first surface 26 and a second surface 27 opposite thereto. The cover film 6 consists of linear low density polyethylene (LLDPE) in this embodiment. If the cover film 6 is made of polyethylene, for example, if the seal fluid layer 7 is made of silicone oil, it has good affinity with the seal fluid layer 7 .

Linear low density polyethylene may have a density of 0.910 g/cm ³ or more and 0.930 g/cm ³ or less. The cover film 6 may have a thickness of, for example, 30 μm or more and 80 μm or less (specifically, about 50 μm). Note that the cover film 6 may be replaced with other materials as long as they have flexibility equivalent to that of linear low-density polyethylene (LLDPE). For example, the cover film 6 is preferably made of a resin material having a Young's modulus of 10 MPa or more and 25 MPa or less. Examples of resin materials having a Young's modulus within this range include linear low-density polyethylene and thermoplastic elastomers such as olefinic thermoplastic elastomers (TPO). Also, the Young's modulus may be a value measured according to ISO527-1 (JIS K 7161), for example.

In this embodiment, the cover film 6 is formed in a generally quadrangular shape in plan view (for example, a quadrangular shape with four rounded corners). Referring to FIG. 9, the size of the cover film 6 (vertical length L3×horizontal width W3) is the same as the size of the gas vent valve 1, for example, 15 mm×15 mm or more and 25 mm×25 mm or less (specifically may be about 20 mm×20 mm).

The cover film 6 is laminated on the first surface 9 of the base film 5 so as to cover the ventilation holes 16 , and the second surface 27 of the cover film 6 is attached to the base by the pair of first adhesive portions 17 and the pair of second adhesive portions 18 . It is adhered to the film 5.

The sealing fluid layer 7 is formed between the cover film 6 and the first release layer 13 (first region 22) of the base film 5. As the sealing fluid layer 7, for example, silicone oil, silicone adhesive, or the like can be used. The cover film 6 is adhered to the first release layer 13 (first region 22) of the base film 5 by the adhesive force of the sealing fluid layer 7 so as to be openable and closable in the third direction Z direction.

A portion between the base film 5 and the cover film 6 and sandwiched between the pair of first adhesion portions 17 is the gas discharge path 28 . The gas discharge path 28 is formed in a strip shape along the second direction Y so as to overlap the vent hole 16 . That is, the space between the first peeling layer 13 and the cover film 6 is the gas exhaust path 28 . The gas discharge path 28 has a first end 29 and an opposite second end 30 in the second direction Y. As shown in FIG. For example, the end on one end face 1A side may be the first end 29 and the end on the other end face 1A side may be the second end 30 .

In this embodiment, both the first end portion 29 and the second end portion 30 are open ends in which both sides in the first direction X of each second adhesion portion 18 are open. In other words, the first end 29 and the second end 30 of the gas exhaust path 28 are partially closed by the second adhesive site 18 . As a result, the adhesion boundary 31 between the base film 5 and the cover film 6 is exposed from the pair of end faces 1A of the gas vent valve 1 . The gas that has passed through the vent hole 16 can be discharged from both sides of the one end face 1A and the other end face 1A through the gas discharge path 28. As shown in FIG.

The auxiliary film 8 is made of a plastic material such as PET (polyethylene terephthalate), PC (polycarbonate), or PP (polypropylene). The thickness of the auxiliary film 8 may be greater than the thickness of the base film 5, for example. The thickness of the auxiliary film 8 may be, for example, 150 μm or more and 300 μm or less (specifically, about 200 μm).

The auxiliary film 8 is selectively formed on the region above the pair of first adhesion sites 17 on the cover film 6 . The pair of auxiliary films 8 are, for example, formed in the same strip shape as the pair of first adhesion sites 17 . The auxiliary film 8 is adhered to the cover film 6 by an adhesive layer (for example, an acrylic adhesive or the like) not shown. In addition, since the auxiliary film 8 has a structure that protrudes from the first surface 26 of the cover film 6, it may be called an auxiliary wall.
[Situation and effect of degassing by degassing valve 1]
FIGS. 10A and 10B, and FIGS. 11A and 11B are diagrams showing degassing via the degassing valve 1. FIG. 12A and 12B are diagrams showing a state in which powder material particles 33 are sandwiched between the base film 5 and the cover film 6. FIG. 10A and 11A are cross-sectional views corresponding to FIG. 7, and FIGS. 10B and 11B are cross-sectional views corresponding to FIG.

As shown in FIGS. 10A and 10B, the gas vent valve 1 is placed in the soft packaging material 21 of the packaging container 2 having the through holes 32 formed therein, and the second surface 10 of the base film 5 faces the outer surface 3. is glued with The gas vent valve 1 and the soft packaging material 21 may be bonded with the back adhesive layer 14 . The base film 5 may not have the back adhesive layer 14. In this case, the gas vent valve 1 can be adhered to the flexible packaging material 21 by applying an adhesive to the back surface of the base material layer 11. can.

When gas is generated from the powder material in the packaging container 2 and the inside of the packaging container 2 is overpressured, the internal pressure passes through the through hole 32 of the packaging container 2 and the vent hole 16 of the gas vent valve 1 to the cover film 6 . acts on When the internal pressure of the packaging container 2 exceeds a predetermined pressure and the pressure acting on the cover film 6 increases, as shown in FIGS. It will be in a partially floating state with respect to 5. More specifically, gas-induced bubbles travel through the sealing fluid layer 7 formed in the gas exhaust channel 28 from the vent hole 16 toward the first end 29 and the second end 30 . Then, the gas is discharged outside from the pair of end faces 1A of the gas vent valve 1. As shown in FIG. After that, when the internal pressure of the packaging container 2 becomes less than the predetermined pressure, the cover film 6 returns to its original state. As a result, the gas discharge path 28 is again sealed by the sealing fluid layer 7 . That is, the air from the outside to the packaging container 2 is blocked.

According to this gas vent valve 1, the cover film 6 is made of a flexible material such as linear low-density polyethylene or thermoplastic elastomer. Therefore, the cover film 6 can be deformed with a relatively small pressure (for example, about 10 mmHg), so the gas can be easily discharged.

Moreover, as shown in FIG. 12A, even if the powder material is sandwiched between the cover film 6 and the base film 5 in the gas discharge path 28, the cover film 6 is formed into the shape of particles so as to wrap the particles 33 of the powder material. transform along. This can prevent the cover film 6 from floating over a wide range with respect to the base film 5 . As a result, the inflow of outside air into the packaging container 2 can be suppressed satisfactorily. On the other hand, if the cover film 6 is made of a hard material, spaces 34 are likely to be formed around the particles 33 of the powder material as shown in FIG. Functionality may be reduced.

In the gas vent valve 1, the second adhesive portion 18 is partially formed in the gas discharge passage 28. As a result, for example, even if a force is applied to the gas vent valve 1 from both sides in the first direction X (for example, left and right sides of the gas vent valve 1) and the gas vent valve 1 is bent, the cover film 6 will not move against the base film 5. can be prevented from floating. As a result, the check function of the gas vent valve 1 can be favorably maintained.

A first step 20 and a second step 24 corresponding to at least the thickness of the first peeling layer 13 are formed between the surface of the first peeling layer 13 and the surface of the first adhesive layer 12 . Thereby, the first region 22 of the base film 5 is convex with respect to the second region 23 and the third region 25 . Therefore, the cover film 6 can be adhered to the first adhesive layer 12 in a stretched state. In particular, in this embodiment, the cover film 6 can be fixed while being stretched in four directions toward the

adhesive portions

17 and 18 formed near the four end faces 1A and 1B of the gas vent valve 1. FIG. As a result, the adhesion between the cover film 6 and the base film 5 can be improved, so that the check function of the gas vent valve 1 can be improved.

Furthermore, since the sealing fluid layer 7 can improve the adhesion between the cover film 6 and the base film 5, the check function of the gas vent valve 1 can be further improved. Further, as described above, since the adhesion between the cover film 6 and the base film 5 is improved by applying tension to the cover film 6, even if the amount of the seal fluid layer 7 is small, the adhesion can be improved. You can fully enjoy the effects.

Also, for example, when a plurality of packaging containers 2 are stored overlapping (for example, when stacked vertically), the adjacent packaging containers 2 are in close contact with the gas vent valve 1, so that the gas vent valve 1 Cover film 6 may be pressed against base film 5 . As a result, even if the internal pressure of the packaging container 2 exceeds a predetermined pressure, the gas discharge path 28 may not be opened and the gas inside the packaging container 2 may not be discharged. Therefore, by providing the auxiliary film 8, the auxiliary film 8 intervenes between the packaging container 2 and the cover film 6 adjacent to each other. As a result, it is possible to prevent the cover film 6 from being pressed by the packaging container 2 .

Furthermore, since the cover film 6 is flexible and the gas vent valve 1 deforms along the shape of the outer surface 3 of the packaging container 2, the non-return function can be achieved regardless of the shape of the outer surface 3 of the packaging container 2. can be expressed. For example, in the case of the packaging container 2 in which coffee beans are vacuum-packaged, the outer surface 3 of the packaging container 2 becomes an uneven surface along the shape of the coffee beans. Even in such a case, since the gas vent valve 1 is deformed along the uneven shape, it is possible to fully exhibit the check function.
[Manufacturing method of gas vent valve 1]
13A and 13B to 18A and 18B are diagrams showing part of the manufacturing process of the gas vent valve 1. FIG. 13B and 14B respectively show the side surface of the base film 5 when viewed in the direction of arrow B in FIGS. 13A and 14A. 15B, 16B, 17B and 18B show cross-sections taken along line BB of FIGS. 15A, 16A, 17A and 18A, respectively. Figures 15C, 16C, 17C and 18C show cross-sections taken along line CC of Figures 15A, 16A, 17A and 18A, respectively.

To manufacture the gas vent valve 1, for example, a base film 5 is prepared with reference to FIGS. 13A and 13B. In this embodiment, a strip-shaped base film 5 wound in a roll is pulled out in order, and a large number of gas vent valves 1 are continuously formed at intervals along the longitudinal direction of the base film 5 . The length of the roll-shaped base film 5 may be, for example, about 100 m.

The base film 5 has, for example, a structure in which a strip-shaped back adhesive layer 14 having the same width, a base layer 11, a first adhesive layer 12 and a first release layer 13 are laminated in order on a strip-shaped mount film 15. It is a double-sided adhesive film with Examples of the mount film 15 include a plastic material such as PET. The thickness of the mount film 15 may be, for example, 10 μm or more and 100 μm or less (specifically, about 70 μm). Specific commercial products of such a double-sided adhesive film include, for example, Neo Fix manufactured by Nichiei Shinka Co., Ltd. and the like.

Next, oil that constitutes the sealing fluid layer 7 is applied onto the first release layer 13 . In this embodiment, along the longitudinal direction of the base film 5, the silicone oil is dripped in strips. In FIG. 13A , the area where the stripe thin line is drawn is the area where the oil for the sealing fluid layer 7 is applied.

Next, with reference to FIGS. 14A and 14B, a first cut line 35, a second cut line 36 and a third cut line 37 are formed on the base film 5. FIG. The first cut line 35 forms the vent 16 . For example, by inserting the first punching blade 38 circular in plan view from the surface of the first release layer 13 to the back surface of the mount film 15, the first cut lines 35 circular in plan view are formed one by one. .

The second cut line 36 forms the first adhesion portion 17. For example, the second cut line 36 is formed by inserting a pair of second punching blades 39 from the surface of the first release layer 13 to the first adhesive layer 12 and running parallel along the longitudinal direction of the base film 5. be done. A third cut line 37 forms the second adhesive site 18 . For example, by inserting the semicircular third cutting blade 40 in plan view from the surface of the first release layer 13 to the first adhesive layer 12, semicircular third cut lines 37 in plan view are formed one by one. be done.

Next, referring to FIGS. 15A to 15C, unnecessary portions of the base film 5 separated by the first cut line 35, the second cut line 36 and the third cut line 37 are removed. In this embodiment, the air holes 16 are formed by removing the base layer 11, the first adhesive layer 12, the first release layer 13, the back adhesive layer 14, and the mount film 15, which are partitioned by the first cut lines 35. be done. By peeling the first peeling layer 13 partitioned by the second cut line 36 and the third cut line 37, the first adhesive portion 17 and the second adhesive portion 18 are formed.

Next, the cover film 6 is laminated on the base film 5 with reference to FIGS. 16A to 16C. In this embodiment, a strip-shaped cover film 6 wound into a roll is prepared. The cover film 6 is laminated to the base film 5 in order along the longitudinal direction of the base film 5 and adhered via the first adhesion portion 17 and the second adhesion portion 18 .

Next, with reference to FIGS. 17A to 17C, the auxiliary film 8 is laminated on the cover film 6. FIG. In this embodiment, a band-shaped auxiliary film 8 wound into a roll is prepared. The auxiliary film 8 is laminated to the cover film 6 in order along the longitudinal direction of the cover film 6 and adhered via an adhesive layer (for example, an acrylic adhesive or the like) not shown.

Next, referring to FIGS. 18A to 18C, cut lines (not shown) corresponding to the shape of each gas vent valve 1 are formed in the cover film 6 and the base film 5, and the cover is cut along the cut lines. Unnecessary portions of film 6 and base film 5 are removed. In this embodiment, the gas vent valve 1 is formed by punching out the cover film 6 and the base film 5 one by one with a size of 20 mm×20 mm. Through the above steps, the gas vent valve 1 described above is obtained.

Incidentally, as shown in FIG. 19, the completed gas vent valve 1 may be provided as a gas vent valve sheet 100 by arranging a plurality of them side by side on a single wide mount film 15 . In this case, each time the gas vent valve 1 is adhered to the packaging container 2 , the gas vent valve 1 to be used may be peeled off from the mount film 15 . If a plurality of gas vent valves 1 are attached side by side to a single mount film 15 as shown in FIG. 19, the gas vent valve sheet 100 can be leaned or stored in a file. can be easily stored.

On the other hand, in the steps of FIGS. 18A to 18C, the gas vent valve 1 including the mount film 15 may be punched out. In this case, since each gas vent valve 1 has a second release layer composed of the backing film 15 , the gas vent valve 1 may be attached to the packaging container 2 after peeling the second release layer.

Although one embodiment of the present disclosure has been described above, the present disclosure can also be implemented in other forms.

For example, in the above-described embodiment, the gas vent valve 1 was formed in a substantially rectangular shape in plan view, but may be formed in a circular shape in plan view. In this case, for example, the base film 5 and the cover film 6 may each be formed in a circular shape in plan view. Of course, the shape of the gas vent valve 1 is not limited to the illustrated substantially square shape and circular shape, and various shapes can be adopted. For example, it may be square, triangular, hexagonal, elliptical, or star-shaped.

Also, as shown in FIG. 20, the gas vent valve 1 may not be provided with the auxiliary film 8. Moreover, as shown in FIG. 21, the pair of second bonding portions 18 may be formed between the air hole 16 and the pair of end faces 1A. In this case, the pair of second adhesion sites 18 may be spaced apart from each of the air holes 16 and the pair of end faces 1A. Further, as shown in FIG. 22 , the air hole 16 and the pair of second adhesion sites 18 may each be formed in a generally quadrangular shape in a plan view.

Further, for example, in the above-described embodiment, as an example of the use of the gas vent valve 1, the packaging container 2 containing powdered material (regular coffee) was taken up. It can also be used for containers. The packaging container 2 may contain food such as miso, which is not a powder material but which generates gas during storage.

Further, the gas vent valve 1 can be attached not only to the packaging container 2 to be shipped as the product, but also to the subdivided bag when the user divides the purchased product into subdivided bags, for example. .

In addition, it is possible to make various design changes within the scope of the matters described in the claims.

This application corresponds to Japanese Patent Application No. 2021-024062 filed with the Japan Patent Office on February 18, 2021, and the entire disclosure of this application is incorporated herein by reference.
1: Gas vent valve 1A: End surface 1B: End surface 2: Packaging container 3: Outer surface 4: Inner surface 5: Base film 6: Cover film 7: Seal fluid layer 8: Auxiliary film 9: First surface 10: Second surface 11: Base layer 12 : First adhesive layer 13 : First peeling layer 14 : Back adhesive layer 15 : Mounting film 16 : Vent hole 17 : First adhesion part 18 : Second adhesion part 19 : Margin 20 : First step 21 : Soft packaging material 22 : First area 23 : Second area 24 : Second step 25 : Third area 26 : First surface 27 : Second surface 28 : Gas discharge path 29 : First end 30 : Second end Part 31 : Adhesion boundary 32 : Through hole 33 : Particle 34 : Space 35 : First cut line 36 : Second cut line 37 : Third cut line 38 : First punching blade 39 : Second punching blade 40 : Third punching Blade 100: Gas vent valve sheet D1: (Ventilation hole) Diameter D2: (Second adhesion part) Diameter L1: (Gas vent valve) Length L2: (Base film) Length L3: (Cover film) Length W1: (Gas vent valve) Width W2: (Base film) Width W3: (Cover film) Width W4: (First release layer) Width W5: (First adhesive portion) Width X: First direction Y: Second direction Z: third direction

Claims

A vent valve for a packaging container that can be attached to the outer surface of a flexible packaging material of the packaging container, comprising:
having a first side and an opposite second side, wherein a gas vent is formed through from the first side to the second side, and the second side may be adhered to the flexible packaging material; a base film;
Laminated on the first surface of the base film so as to cover the air vent, and made of linear low-density polyethylene, the air vent is sandwiched by a pair of first adhesion sites facing each other in the first direction. a cover film adhered to the base film;
A gas discharge formed along a second direction intersecting the first direction so as to overlap with the ventilation hole at a portion sandwiched between the pair of first bonding portions between the base film and the cover film. a channel having a first end and an opposite second end in said second direction, at least one of said first end and said second end being an open end of said gas discharge channel; a gas discharge path that is
A gas vent valve, comprising: a second adhesive portion disposed on the open end side of the gas discharge path with respect to the air hole and formed by partially bonding the cover film and the base film.
The base film includes a substrate layer, a first adhesive layer laminated on the first surface side of the substrate layer, and a first release layer peelably laminated on the first adhesive layer. including
A part of the first adhesive layer is exposed from the first release layer as the pair of first adhesive sites sandwiching the first release layer in the first direction,
The cover film straddles the first release layer, is adhered to the first adhesive layer as the pair of first adhesion sites, and forms the gas discharge path between the cover film and the first release layer. 2. The vent valve of claim 1, wherein the vent valve is
The vent valve according to claim 2, comprising a sealing fluid layer formed between said first release layer and said cover film.
The first surface of the base film has a first region in which the gas discharge path is formed and a pair of first adhesion sites, sandwiches the first region in the first direction, and and a pair of second regions recessed on the second surface side with respect to the regions,
The cover film straddles the first region, is adhered to the base film in the pair of second regions, and forms the gas discharge path between the first regions,
2. The vent valve of claim 1 including a sealing fluid layer formed between said first region and said cover film.
The gas vent valve according to any one of claims 1 to 4, further comprising a pair of auxiliary films selectively formed in the region above the pair of first adhesion sites in the cover film.
both the first end and the second end of the gas discharge channel are the open ends;
The second adhesive part is a pair of parts partially closing the first end and the second end such that the adhesive boundary between the base film and the cover film is exposed from the end surface of the gas vent valve. A vent valve as claimed in any one of claims 1 to 5, comprising a second adhesive site.
The ventilation hole is formed in a perfect circle shape in a plan view,
7. The gas vent valve according to claim 6, wherein each of said pair of second adhesion sites is formed in a semicircular shape having a diameter smaller than that of said ventilation hole in plan view.
The gas vent valve according to any one of claims 1 to 7, wherein the linear low density polyethylene has a density of 0.910 g/cm 3 or more and 0.930 g/cm 3 or less.
A vent valve for a packaging container that can be attached to the outer surface of a flexible packaging material of the packaging container, comprising:
having a first side and an opposite second side, wherein a gas vent is formed through from the first side to the second side, and the second side may be adhered to the flexible packaging material; a base film;
Laminated on the first surface of the base film so as to cover the ventilation holes, and made of a resin material having a Young's modulus of 10 MPa or more and 25 MPa or less, a pair of second a cover film adhered to the base film by one adhesion site;
A gas discharge formed along a second direction intersecting the first direction so as to overlap with the ventilation hole at a portion sandwiched between the pair of first bonding portions between the base film and the cover film. a channel having a first end and an opposite second end in said second direction, at least one of said first end and said second end being an open end of said gas discharge channel; a gas discharge path that is
A gas vent valve, comprising: a second adhesive portion disposed on the open end side of the gas discharge passage with respect to the air hole and formed by partially bonding the cover film and the base film.
The gas vent valve according to claim 9, wherein the resin material includes at least one of linear low-density polyethylene and thermoplastic elastomer.
The gas vent valve according to any one of claims 1 to 10, wherein the base film includes a back adhesive layer laminated on the second surface side.
a mount film;
12. A gas vent valve sheet comprising a plurality of gas vent valves according to claim 11 arranged detachably from the mount film via the back adhesive layer.