JPWO2018116630A1 - Ventilation member, ventilation casing and ventilation container using the same - Google Patents

Abstract

The present disclosure includes a waterproof and dustproof air-permeable membrane that allows gas passing through the opening to pass through in a state of being fixed to the opening, and a valve film that is disposed so as to cover the air-permeable region of the air-permeable membrane. The film is bonded to each other at a part of the peripheral edge of the gas permeable membrane directly or via an intermediate member. In the region not bonded to the gas permeable membrane of the valve film, the gas permeable membrane is directed toward the valve film. Reversible deformation is possible in the direction away from the gas permeable membrane by the pressure of the permeating gas, and the gas passing through the gas permeable membrane in the direction of the valve film is deformed in the direction away from the gas permeable membrane. Provided is a ventilation member that passes through a valve film and is discharged in the direction of a peripheral portion that is not joined to the valve film of the ventilation film. The ventilation member of the present disclosure is an asymmetric ventilation member provided with a waterproof and dustproof breathable membrane, and has a novel configuration that has not been achieved in the past.

Description

  The present invention is a ventilation member that can be fixed to various cases and containers, etc., and can be used to ensure asymmetric air permeability between the inside and outside of the case and the container, and includes a waterproof and dustproof air-permeable membrane. The present invention relates to a ventilation member that can enjoy the function of the ventilation membrane, and a ventilation casing and a ventilation container using the ventilation member.

  A ventilation member having a waterproof / dustproof function ventilation film (waterproof dustproof ventilation film) may be attached to a vehicle electrical component such as a lamp, pressure sensor, ECU (Electronic Control Unit) and various electrical products. . By installing a ventilation member, a ventilation path between the outside and inside of the housing is secured, reducing pressure fluctuations inside the housing due to temperature changes, and releasing gas generated inside the housing to the outside. You can. Further, the waterproof and dustproof air permeable membrane can prevent entry of foreign matters such as water and / or dust from the outside to the inside of the housing through the ventilation path.

  A ventilation member may be attached to a container such as food. By attaching the ventilation member, a ventilation path between the outside and the inside of the container can be secured, and the pressure fluctuation inside the container accompanying a temperature change can be alleviated, and the gas generated inside the container can be released to the outside.

  In a ventilation member having symmetrical ventilation, for example, when attached to a housing, the air permeability of the member from the inside of the housing to the outside and the air permeability of the member from the outside to the inside are the same. . However, a ventilation member having asymmetric air permeability, for example, a ventilation member in which the air permeability of the member from the inside of the housing to the outside differs from the air permeability of the member from the outside to the inside when attached to the housing. Is known, and an example thereof is disclosed in Patent Document 1.

JP 2006-324086 A

  In recent years, the need for a ventilation member having asymmetric air permeability has increased.

  As an example, for a ventilation member attached to the housing of an electrical component such as a lamp, the air permeability from the inside to the outside is greater than the air permeability of the member from the outside to the inside of the housing when attached to the housing. There is a need for ventilation members. By adopting such a ventilation member, for example, the pressure rise inside the housing due to the temperature rise associated with the lamp lighting is quickly mitigated, and the intrusion of water vapor from the outside to the inside is suppressed, and the housing due to the temperature drop after the light is turned off. It is expected to suppress the occurrence of condensation inside the body.

  As another example, for a ventilation member attached to a container such as a food product, the ventilation that increases the air permeability from the inside to the outside while minimizing the air permeability of the member from the outside to the inside of the container when attached to the container There is a need for materials. By adopting such a ventilation member, for example, the gas generated from the food that is the contents of the container can be quickly discharged to the outside of the container, while the intrusion of air (oxygen) from the outside to the inside of the container is suppressed. Therefore, it is expected that the quality of the food in the container is maintained.

  One of the objects of the present invention is to provide a ventilation member having an asymmetric air permeability, provided with a waterproof and dustproof air-permeable membrane, and having a novel structure that has not been heretofore known.

  The ventilation member of the present invention includes a waterproof and dustproof ventilation film that allows gas passing through the opening to pass through in a state of being fixed to the opening; and a valve film that is disposed so as to cover the ventilation region of the ventilation film. The gas permeable membrane and the valve film are bonded to each other directly or via an intermediate member at a part of the peripheral edge of the gas permeable membrane. The region of the valve film that is not joined to the gas permeable membrane can be reversibly deformed in the direction away from the gas permeable membrane by the pressure of gas that passes through the gas permeable membrane in the direction of the valve film. The gas that passes through the gas permeable membrane in the direction of the valve film passes between the gas permeable membrane and the valve film deformed in the separating direction, and is joined to the valve film of the gas permeable membrane. Not discharged in the direction of the periphery.

  In the ventilation casing of the present invention, the ventilation member of the present invention is fixed to the opening of the casing. The ventilation member has the valve film side facing the outside of the casing and the ventilation membrane side of the ventilation film. The opening is fixed so as to face the inside of the housing.

  In the vent container of the present invention, the vent member of the present invention is fixed to the opening of the container, and the vent member has the valve film side facing the outside of the container, and the vent film side is the interior of the container. It is being fixed to the said opening so that it may face.

  ADVANTAGE OF THE INVENTION According to this invention, it is an asymmetrical ventilation member provided with the waterproof dustproof ventilation membrane, Comprising: The ventilation member which has a novel structure which is not in the past is achieved.

FIG. 1A is a cross-sectional view schematically showing an example of a ventilation member of the present invention. 1B is a plan view of the ventilation member shown in FIG. 1A as viewed from the waterproof and dustproof ventilation membrane side. FIG. 1C is a cross-sectional view schematically showing an example of the ventilation member of the present invention. FIG. 2A is a schematic diagram for explaining the deformation of the valve film in an example of the ventilation member of the present invention. FIG. 2B is a schematic diagram for explaining the deformation of the valve film in an example of the ventilation member of the present invention. FIG. 3A is a schematic diagram for explaining a state in which the pressure of the gas B that attempts to permeate the waterproof and dustproof breathable membrane from the valve film side is applied in the example of the vent member of the present invention. FIG. 3B is a schematic diagram for explaining a state in which the pressure of the gas A to be transmitted through the waterproof and dustproof breathable membrane in the direction of the valve film is applied, and a ventilation path of the gas A in the state in the example of the ventilation member of the present invention. FIG. FIG. 4 is a schematic view for explaining a joint portion in an example of the ventilation member of the present invention. FIG. 5 is a cross-sectional view schematically showing an example of the ventilation member of the present invention. FIG. 6 is a schematic view for explaining a free end portion of the valve film in an example of the ventilation member of the present invention. FIG. 7 is a cross-sectional view schematically showing an example of the ventilation member of the present invention. FIG. 8 is a schematic diagram for explaining the relationship between the joint portion and the fixing portion in an example of the ventilation member of the present invention. FIG. 9 is a cross-sectional view schematically showing an example of a state in which the ventilation member of the present invention is fixed to the opening. FIG. 10A is a plan view schematically showing an example of the ventilation member of the present invention. 10B is a cross-sectional view schematically showing a cross section II of the ventilation member shown in FIG. 10A. FIG. 11A is a plan view schematically showing an example of the ventilation member of the present invention. 11B is a cross-sectional view schematically showing a cross section II of the ventilation member shown in FIG. 11A. FIG. 12A is a plan view schematically showing an example of the ventilation member of the present invention. 12B is a cross-sectional view schematically showing a cross section II of the ventilation member shown in FIG. 12A. FIG. 13A is a plan view schematically showing an example of the ventilation member of the present invention. 13B is a cross-sectional view schematically showing a cross section II of the ventilation member shown in FIG. 13A. FIG. 14A is a plan view schematically showing an example of the ventilation member of the present invention. 14B is a cross-sectional view schematically showing a cross section II of the ventilation member shown in FIG. 14A. FIG. 15A is a plan view schematically showing an example of the ventilation member of the present invention. FIG. 15B is a cross-sectional view schematically showing a cross section II of the ventilation member shown in FIG. 15A. FIG. 16A is a plan view schematically showing an example of the ventilation member of the present invention. 16B is a cross-sectional view schematically showing a cross section II of the ventilation member shown in FIG. 16A. FIG. 17 is a schematic view showing an example of a vent container according to the present invention. FIG. 18 is a schematic view showing an example of the ventilation casing of the present invention. FIG. 19 is a schematic diagram for explaining a ventilation member manufactured in Example 4. FIG. 20A is a schematic diagram for explaining a ventilation member manufactured in Comparative Example 1. FIG. 20B is a schematic diagram for explaining a ventilation member manufactured in Comparative Example 1. FIG. FIG. 21A is a schematic diagram for explaining a ventilation member manufactured in Comparative Example 2. FIG. FIG. 21B is a schematic diagram for explaining a ventilation member manufactured in Comparative Example 2. FIG. 22 is a diagram illustrating a relationship between the differential pressure applied to the member and the amount of gas permeating the member per unit time in the ventilation member manufactured in Example 1. FIG. 23A is a schematic diagram for explaining a ventilation member manufactured in Example 13. FIG. FIG. 23B is a schematic diagram for explaining a ventilation member manufactured in Example 13. FIG. 24A is a schematic diagram for explaining a ventilation member manufactured in Comparative Example 4. FIG. FIG. 24B is a schematic diagram for explaining a ventilation member manufactured in Comparative Example 4. FIG. 25 is a diagram for explaining a method of evaluating the characteristics of the ventilation member.

  The ventilation member according to the first aspect of the present disclosure includes a waterproof and dustproof ventilation film that allows gas passing through the opening to pass therethrough, and a valve film disposed so as to cover a ventilation region of the ventilation film. The gas permeable membrane and the valve film are joined to each other at a part of the peripheral edge of the gas permeable membrane, directly or via an intermediate member, and joined to the gas permeable membrane of the valve film. The non-circular region can be reversibly deformed in a direction away from the gas permeable membrane by the pressure of gas that passes through the gas permeable membrane in the direction of the valve film, and passes through the gas permeable membrane in the direction of the valve film. The gas is a ventilation member that passes between the gas permeable membrane and the valve film that is deformed in the separating direction and is discharged in the direction of the peripheral portion of the gas permeable membrane that is not joined to the valve film. is there.

  In the ventilation member according to the second aspect of the present disclosure, in the ventilation member according to the first aspect, the shape and area of the ventilation film and the valve film are the same.

  In the ventilation member of the third aspect of the present disclosure, in the ventilation member of the first or second aspect, the shape of the ventilation film and / or the valve film is a circle, an ellipse, or a polygon.

  In the ventilation member according to the fourth aspect of the present disclosure, in the ventilation member according to any one of the first to third aspects, the ventilation film and the valve film are arranged in a circumferential direction of a region located at a peripheral portion of the ventilation film. Some are joined together.

  In the ventilation member of the fifth aspect of the present disclosure, in the ventilation member of the fourth aspect, at least one first portion in which the gas permeable membrane is bonded to the valve film in a region located at the peripheral edge, A second portion that is not joined to the valve film in the region, and wherein the ventilation region of the gas permeable membrane is viewed from a direction perpendicular to the main surface of the gas permeable membrane, and the at least one first portion Two end portions of the at least one first portion, and at least one line segment connecting the two end portions adjacent to each other along the circumferential direction with the second portion interposed therebetween. , Surrounded by

  In the ventilation member according to the sixth aspect of the present disclosure, in the ventilation member according to the fourth or fifth aspect, at least one first portion in which the ventilation film is joined to the valve film in a region located at the peripheral edge. And a second portion that is not joined to the valve film in the region, and the valve film is viewed from a direction perpendicular to the main surface of the valve film, and the at least one first portion And a portion projecting outward with respect to a line segment connecting the two end portions adjacent to each other along the circumferential direction with the second portion interposed therebetween.

  In the ventilation member according to the seventh aspect of the present disclosure, in the ventilation member according to any one of the first to sixth aspects, the valve film has a slightly adhesive layer on the surface of the ventilation film.

  In the ventilation member according to the eighth aspect of the present disclosure, in the ventilation member according to the seventh aspect, the slightly adhesive layer is made of a urethane adhesive, an acrylic adhesive, or a silicone adhesive.

  In the ventilation member of the ninth aspect of the present disclosure, in the ventilation member of the seventh or eighth aspect, the adhesive force of the slightly adhesive layer at 23 ° C. with respect to a polyethylene terephthalate (PET) film is 0.2 N / 20 mm or less. .

  In the ventilation member according to the tenth aspect of the present disclosure, in the ventilation member according to any one of the first to ninth aspects, the gas permeable film and the valve film are directly bonded by a double-sided tape.

  In the ventilation member according to the eleventh aspect of the present disclosure, in the ventilation member according to any one of the first to tenth aspects, the intermediate member is a film that does not have air permeability in the film thickness direction.

  In the ventilation member according to the twelfth aspect of the present disclosure, in the ventilation member according to any one of the first to eleventh aspects, the peripheral edge of the surface of the gas permeable membrane opposite to the surface to which the valve film is bonded is provided. A fixing portion for fixing the ventilation member to the opening is further provided.

  In the ventilation member according to the thirteenth aspect of the present disclosure, in the ventilation member according to the twelfth aspect, the fixing portion is configured by a double-sided tape.

  In the ventilation member according to the fourteenth aspect of the present disclosure, in the ventilation member according to any one of the first to thirteenth aspects, the Gurley number from the valve film side toward the ventilation film is 10 seconds / 100 mL or more.

  In the ventilation member according to the fifteenth aspect of the present disclosure, in the ventilation member according to any one of the first to fourteenth aspects, from the side of the ventilation film to the Gurley number from the valve film side to the direction of the ventilation film, The ratio of the Gurley number in the direction of the valve film is 10 or more.

  In the ventilation casing according to the sixteenth aspect of the present disclosure, the ventilation member according to any one of the first to fifteenth aspects is fixed to an opening of the casing, and the ventilation member has the valve film side of the casing. It faces the outside and is fixed to the opening so that the side of the gas permeable membrane faces the inside of the housing.

  In the vent container according to the seventeenth aspect of the present disclosure, the vent member according to any one of the first to fifteenth aspects is fixed to an opening of the container, and the vent member faces the valve film side to the outside of the container. And it is being fixed to the said opening so that the side of the said air permeable membrane may face the inside of the said container.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following is an explanation of an example of the ventilation member of the present invention, and the present invention is not limited to the range shown by this example.

(Embodiment 1)
The ventilation member 1 shown in FIGS. 1A and 1B includes a waterproof and dustproof ventilation membrane (hereinafter also simply referred to as “aeration membrane”) 2 and a valve film 3 disposed so as to cover the ventilation membrane 2. The gas permeable membrane 2 and the valve film 3 are joined to each other at a joint portion 4 located at a part of the peripheral edge of the gas permeable membrane 2. The shape of the gas permeable membrane 2 and the valve film 3 is a circle. 1B shows the ventilation member 1 viewed from the side of the ventilation membrane 2, and FIG. 1A shows a cross section II shown in FIG. 1B.

  As shown in FIGS. 2A and 2B, in the ventilation member 1, the region of the valve film 3 that is not joined to the ventilation film 2 is formed by the pressure of the gas A that passes through the ventilation film 2 in the direction of the valve film 3. Reversible deformation is possible in the direction away from the head.

  As shown in FIG. 3A, in the ventilation member 1, the ventilation from the valve film 3 side toward the ventilation film 2 is inhibited by the valve film 3 covering the main surface of the ventilation film 2. For this reason, the air permeability from the valve film 3 side to the air permeable membrane 2 in the air permeable member 1 becomes relatively small. As shown in FIG. 1A, the region of the valve film 3 that is not joined to the gas permeable membrane 2 is in contact with the gas permeable membrane 2 when the gas permeable member 1 is not vented, or the gas permeable membrane 2 is removed from the valve film 3 side. When the pressure of the gas B to be permeated (pressure of ventilation in the direction) changes to the state in contact with the gas permeable membrane 2, the gas film is more reliably inhibited from being vented by the valve film 3. The air permeability of the member 1 from the valve film 3 side toward the gas permeable membrane 2 becomes smaller.

  On the other hand, as shown in FIG. 3B, in the ventilation member 1, the gas A that permeates the ventilation film 2 in the direction of the valve film 3 is between the ventilation film 2 and the valve film 3 that is deformed in the separating direction. Then, the air is discharged in the direction of the peripheral edge of the gas permeable membrane 2 that is not joined to the valve film 3 (the air flow path 8). More specifically, the gas A that has permeated through the gas permeable membrane 2 is deformed in the direction away from the peripheral edge 5 that is not joined to the valve film 3 of the gas permeable membrane 2 as shown in FIGS. 2A and 2B. The gap 7 between the film 3 and the free end 6 is discharged in the direction of the peripheral edge of the gas permeable membrane 2. The fact that the valve film 3 and the gas permeable membrane 2 are joined at the joint 4 is not different from the state shown in FIG. 3A, but in the state shown in FIG. Is more relaxed than the state shown in FIG. 3A. For this reason, the air permeability in the direction of the valve film 3 from the air permeable membrane 2 side in the air permeable member 1 becomes relatively large.

  As shown in FIG. 3B, in the ventilation member 1, the gas A is discharged in a direction different from the direction perpendicular to the main surface of the gas permeable membrane 2. More specifically, the gas A can be discharged to the side of the ventilation member 1, for example, in the direction along the main surface of the ventilation film 2, and the gas A is inclined in the direction inclined from the ventilation shaft of the opening that fixes the ventilation member 1. Can be discharged.

  By the reversible deformation of the valve film 3, the ventilation member 1 can alternately take the state shown in FIG. 3A and the state shown in FIG. 3B.

  When the ventilation member 1 takes the state shown in FIG. 3A and the state shown in FIG. 3B according to the ventilation direction, it means that the ventilation member 1 is a ventilation member having asymmetric air permeability. Means different ventilation members.

  In the ventilation member 1, this asymmetry can be increased. That is, the ratio of the relatively small air permeability to the relatively large air permeability among the two air permeabilitys that differ depending on the air flow direction can be increased. More specifically, the ratio of the air permeability in the direction from the valve film 3 toward the gas permeable membrane 2 and the air permeability in the direction from the gas permeable membrane 2 toward the valve film 3 can be increased. This is because the valve film 3 is disposed so as to cover the ventilation region of the gas permeable membrane 2, the gas permeable membrane 2 and the valve film 3 are joined to each other at a part of the peripheral edge of the gas permeable membrane 2, This is based on the fact that the above-described deformation of the valve film 3 occurs due to the pressure of the gas A that passes through the membrane 2 in the direction of the valve film 3, and that the gas A is discharged through the ventilation path 8.

  In the ventilation member of this embodiment shown in FIGS. 1A and 1B, the region of the valve film 3 that is not joined to the ventilation membrane 2 is in contact with the ventilation membrane 2 when the ventilation member 1 is not vented. The ventilation member of the present invention is not limited to a member that takes such a state. For example, as shown in FIG. 1C, as long as the above-described asymmetric air permeability by the valve film 3 is realized, the region is not vented. Sometimes it may be away from the gas permeable membrane 2. When the ventilation member 1 is “non-ventilated”, both the pressure of the gas A that passes through the ventilation film 2 in the direction of the valve film 3 and the pressure of the gas B that tries to pass through the ventilation film 2 from the valve film 3 side. This means a state where the ventilation member 1 is not added (steady state).

  The shape of the joint 4 between the gas permeable membrane 2 and the valve film 3 is not limited as long as the gas permeable membrane 2 and the valve film 3 are joined to each other at a part of the peripheral edge of the gas permeable membrane 2. In the ventilation member 1 of the present embodiment, as shown in FIG. 4, a part of the ring-shaped region 9 in the circumferential direction, in which the gas permeable membrane 2 and the valve film 3 are located at the peripheral edge of the gas permeable membrane 2. Are joined together. That is, the joint portion 4 of the ventilation member 1 according to the present embodiment corresponds to a part in the circumferential direction of the ring-shaped region 9 located at the peripheral edge of the gas permeable membrane 2. In the ventilation member 1 of this embodiment shown in each drawing, the ventilation film 2 and the valve film 3 are joined to each other only at a part of the peripheral edge of the ventilation film 2.

  In the ventilation member 1, for example, the air permeability from the side of the gas permeable membrane 2 to the direction of the valve film 3 and from the side of the valve film 3 due to the shape of the joint 4 located at a part of the peripheral edge of the gas permeable membrane 2 The ratio between the air permeability in the direction of the air permeable membrane 2 and the air permeability in the direction of the valve film 3 from the air permeable membrane 2 side can be controlled, and the degree of freedom of the control can be increased. For example, the dependence of the air permeability on the pressure of the gas B trying to permeate the gas permeable membrane 2 from the valve film 3 side is small. As a more specific example, the gas permeable membrane 2 from the valve film 3 side is independent of the pressure. The air permeability is low, and in some cases, the air permeability is close to zero. On the other hand, the sensitivity of the air permeability to the pressure of the gas A that passes through the gas permeable membrane 2 in the direction of the valve film 3 is high. It is also possible to make the ventilation member 1 exhibiting an increase in air permeability from the side of the gas permeable membrane 2 to the direction of the valve film 3 even for a small pressure.

  Moreover, the return property of the valve film 3 deformed in the direction away from the gas permeable membrane 2 by the pressure of the gas A can be controlled by the shape of the joint portion 4, for example. The return property is a restoring property in which the valve film 3 attempts to return to the state before deformation when the pressure of the gas A is reduced (for example, when it becomes zero) or when the ventilation member 1 is in a steady state.

  Further, due to the shape of the joint 4, for example, when the ventilation member 1 is in a steady state, the ventilation through the slight gap between the ventilation film 2 and the valve film 3, which is a phenomenon different from the above-described ventilation. The amount of gas permeation between the surface on the gas permeable membrane 2 side of the member 1 and the surface on the valve film 3 side, for example, the amount of oxygen permeation can be controlled. As a more specific example, due to the shape of the joint portion 4, a state where the region not joined to the gas permeable membrane 2 in the valve film 3 is in contact with the gas permeable membrane 2 when the gas permeable member 1 is not vented (the shape, area, and Area ratio and the like), and thereby the amount of gas permeation can be controlled. An example of control is suppression of the amount of gas permeation in a steady state.

  In the joint portion 4, the gas permeable membrane 2 and the valve film 3 can be joined by, for example, welding such as heat welding and ultrasonic welding, adhesion with an adhesive or an adhesive, or a joining member such as a double-sided tape. Bonding with a double-sided tape is simple and reliable. When the gas permeable membrane 2 and the valve film 3 are bonded with a double-sided tape, the ventilation member 1 having excellent durability can be manufactured with high productivity. FIG. 5 shows the ventilation member 1 of the present embodiment in which the ventilation film 2 and the valve film 3 are joined by the double-sided tape 10. The one where the thickness of the double-sided tape 10 is smaller is preferable.

  The specific mode of deformation of the valve film 3 at the time of ventilation from the side of the gas permeable membrane 2 toward the direction of the valve film 3 is not limited. In the ventilation member 1 of the present embodiment, the region of the valve film 3 that is not joined to the ventilation film 2 is in a direction away from the ventilation film 2 with a joint 4 (for example, a double-sided tape 10) with the ventilation film 2 as a fulcrum. It is deformed to warp.

  In such deformation of the valve film 3, the circumferential region C at the end of the valve film 3 shown in FIG. 6 can be the free end 6 of the deformed region of the valve film. That is, in the ventilation member 1 of the present embodiment, the ventilation path 8 can pass through the entire region C having such a width. This also contributes to an improvement in the degree of freedom of the control.

  The gas permeable film 2 is a film having air permeability in the film thickness direction in at least a part of the region. The entire region of the gas permeable membrane 2 may have air permeability in the film thickness direction. Further, the gas permeable membrane 2 is a waterproof and dustproof membrane, for example, a gas permeable membrane having a water pressure resistance measured in accordance with JIS L1092 of 1 kPa or more. The water pressure resistance of the gas permeable membrane may be 2 kPa or more and 3 kPa or more. Moreover, the air permeable membrane having such a water pressure resistance usually has a dustproof property. The method for measuring the water pressure resistance is specifically as follows.

  A 47 mm diameter stainless steel disc (having a thickness that does not deform during water pressure resistance measurement) provided with an opening having a diameter of 2 mm at the center is prepared. Next, an air-permeable membrane as a measurement target is fixed to one surface of the disc so as to cover the opening. The gas permeable membrane is fixed with a double-sided tape so that the center of the gas permeable membrane and the center of the opening coincide. Fixing is performed so that water does not leak from the fixing part between the disc and the gas permeable membrane when measuring the water pressure resistance. Next, the water pressure resistance of the gas permeable membrane is measured in accordance with method A (low water pressure method) or method B (high water pressure method) described in JIS L1092, using the disc on which the gas permeable membrane is fixed as a test piece. The water pressure is applied to the test piece from the surface opposite to the surface on which the gas permeable membrane is fixed. As the test apparatus, an apparatus having the same configuration as the test apparatus exemplified in JIS L1092 can be used except that it has a structure (test piece mounting structure) capable of measuring the water pressure resistance of the test piece.

  The gas permeable membrane 2 is, for example, a polyethylene terephthalate (PET) film having a plurality of through holes in the film thickness direction and a stretched porous film of polytetrafluoroethylene (PTFE). The PET film can be formed by, for example, forming a through hole in a PET film, for example, a non-porous PET film, by, for example, drilling with a laser or the like, or ion beam irradiation and subsequent chemical etching. The PTFE stretched porous membrane is typically a porous membrane having innumerable fine fibrils of PTFE and innumerable pores between the fibrils. For example, the method described in JP-B-42-13560 Can be formed.

  The ventilation member 1 that is a waterproof and dustproof ventilation membrane can prevent the liquid and solid from moving through the member in the ventilation member 1. The ventilation member 1 may be a dustproof and / or waterproof ventilation member. The ventilation member 1 having such characteristics can be obtained by using, for example, the above-described asymmetric air permeability by using the electrical component and the electrical product in the housing, and further, collecting dust and / or the inside of the housing. Alternatively, entry of foreign matter such as water can be suppressed. In addition, by using it in a container such as food, for example, while obtaining the effect of the asymmetric air permeability described above, it is possible to further suppress the intrusion of foreign matter such as dust and / or water into the container, and is included in the contents Leakage of liquid and / or solid to the outside of the container through the ventilation member 1 can be suppressed.

  From the viewpoint of more reliably preventing liquid movement, the air-permeable film 2 may be subjected to liquid repellent treatment such as water repellent treatment and oil repellent treatment. These treatment methods are not limited, and known methods can be applied.

  The gas permeable membrane 2 can be transparent. When the gas permeable membrane 2 is transparent, for example, printing or the like applied to the surface of the container that fixes the gas permeable member 1 can be visually recognized through the gas permeable member 1. In order to obtain this effect, the valve film 3 that can be modified may not necessarily be transparent. However, the valve film 3 can also be transparent. The gas permeable membrane 2 may be colored and / or printed.

  The thickness of the gas permeable membrane 2 is, for example, 10 to 500 μm.

  The ventilation region of the gas permeable membrane 2 is a region in which ventilation is possible in the film thickness direction of the membrane 2 in a state where the gas permeable membrane 2 is incorporated in the gas permeable member 1. For example, a region where the valve film 3 is joined (joint portion 4) and a region where a member having no air permeability such as the double-sided tape 10 is disposed are not included in the ventilation region.

  A reinforcing layer may be laminated on the gas permeable membrane 2, and the strength of the gas permeable membrane 2 can be improved by the lamination of the reinforcing layer, and the effect becomes greater as the thickness of the gas permeable membrane 2 is smaller. The material and structure of the reinforcing layer are not limited, but a reinforcing layer that is more breathable than the breathable membrane 2 is preferable. The reinforcing layer is, for example, a woven fabric, a nonwoven fabric, a mesh, a net, a sponge, a foam, a foam, or a porous film made of resin or metal. The reinforcing layer may be bonded to the gas permeable membrane 2, and the bonding can be performed by a technique such as adhesive lamination, thermal lamination, heat welding, ultrasonic welding, or the like. The gas permeable membrane 2 may be a single membrane that does not have a reinforcing layer.

  The valve film 3 may be any film that can be deformed as described above.

  The valve film 3 is a film that does not have air permeability in the film thickness direction. The valve film 3 may be a film that does not have a through hole and / or a slit that penetrates in the film thickness direction and can serve as a gas ventilation path, and may be a non-porous non-porous film.

  The valve film 3 is, for example, a polymer film, and a more specific example is a non-porous PET film.

  The valve film 3 has a shape that covers at least the ventilation region of the ventilation membrane 2. The valve film 3 may have a shape that covers the entire area of the gas permeable membrane 2.

  The valve film 3 can be transparent. When the valve film 3 is transparent, for example, the state of the gas permeable membrane 2 can be visually recognized through the valve film 3. When the ventilation film 2 is further transparent, for example, printing or the like applied to the surface of the container that fixes the ventilation member 1 can be visually recognized through the ventilation member 1. The valve film 3 may be colored and / or printed.

  The thickness of the valve film 3 is, for example, 10 to 500 μm, and preferably 25 to 100 μm.

  In the ventilation member 1 of the present embodiment, the shapes of the ventilation film 2 and the valve film 3 are both circles (circles as viewed from the direction perpendicular to the main surface of each film / film). Moreover, in the said ventilation member 1, the shape and area (The shape and area seen from the direction perpendicular | vertical to the main surface of each film | membrane / film) of the ventilation film 2 and the valve film 3 are the same. The ventilation member 1 including the ventilation film 2 and the valve film 3 having the same shape and area has high durability and excellent productivity.

  When the shape of the gas permeable membrane 2 and the valve film 3 is a circle, since the region C shown in FIG. 6 is equidistant from the center of the gas permeable membrane 2, the degree of freedom in controlling the air permeability and the air permeability ratio is further improved. To do. The circle includes a substantial circle.

  As long as the effect of the present invention is obtained, the shapes of the gas permeable membrane 2 and the valve film 3 are not limited. The shape of the gas permeable membrane 2 and / or the valve film 3 may be an ellipse. The ellipse includes a substantially ellipse. The shape of the gas permeable membrane 2 and / or the valve film 3 may be a polygon such as a quadrangle, a pentagon, or a hexagon. The corners of the polygon may be rounded. By rounding the corners, there are advantages such as improved handling and prevention of damage to the container due to sharp corners when attached to a soft container or the like. In the second and subsequent embodiments, an example in which the shapes of the gas permeable membrane 2 and the valve film 3 are quadrangular will be described.

  The ventilation member 1 may have a laminated structure including only a ventilation film 2 and a valve film 3 and, if necessary, a film-like member such as a double-sided tape 10. For this reason, the thickness of the ventilation member 1 (thickness in the film thickness direction of the ventilation film 2 and the valve film 3) can be reduced, and the thickness is, for example, 1 mm or less, and can be 100 μm or less. . Moreover, the ventilation member 1 having the above-described laminated structure has high productivity, for example, production by roll-to-roll is possible. Furthermore, in this ventilation member, it is possible to omit the use of a sealing agent such as oil, which is necessary for securing the sealing function in the conventional ventilation member consisting only of a film-like member. By omitting the use of the sealant, for example, adhesion of the sealant to food can be prevented when a ventilation member is used in a food packaging container.

  The air permeability in the direction from the valve film 3 to the air permeable membrane 2 in the air permeable member 1 is expressed by air resistance (Gurley number), for example, 10 seconds / 100 mL or more, and 50 seconds / 100 mL or more. You can also. The Gurley number can be evaluated in accordance with JIS P8117.

  The ratio of the Gurley number from the side of the valve film 3 to the direction of the ventilation film 2 to the Gurley number from the side of the ventilation film 2 toward the valve film 3 in the ventilation member 1 is, for example, 10 or more, 30 or more, 100 In addition, it may be 200 or more. In addition, the value of a Gurley number becomes so small that air permeability is high so that it may be clear from the unit.

  In the above standard, the Gurley number is the air resistance when the differential pressure applied to the evaluation object is 1.22 kPa. Depending on the configuration of the ventilation member 1, the pressure of the gas A (valve opening pressure) that deforms the valve film 3 in the direction away from the ventilation film 2 may exceed 1.2 kPa. In this case, the differential pressure is set to a pressure that can be sufficiently deformed in the direction in which the valve film 3 is separated from the gas permeable membrane 2 to measure the air permeability resistance, and the measured value is converted to a pressure difference of about 1.22 kPa. Can be the Gurley number in the direction of the valve film 3 from the side of the gas permeable membrane 2 in the gas permeable member 1.

  The ventilation member 1 is used by being fixed to the opening. An article having an opening for fixing the ventilation member 1 is not limited. The article having the opening is, for example, a housing for various electrical components and electrical products, a container for food, and a member fixed to the opening of the housing and the container, and a gas passing through the opening passes therethrough. It is a member which has an opening to do. The direction of the ventilation member 1 when it is fixed to the opening is not limited. Typically, the ventilation member 2 has the ventilation film 2 side facing the inside of the article and the valve film 3 side facing the outside of the article. 1 is fixed to the opening.

  The method of fixing the ventilation member 1 to the opening is not limited, and the ventilation member 1 can be fixed to the opening by welding such as heat welding and ultrasonic welding, bonding with an adhesive or an adhesive, or a bonding member such as a double-sided tape. . The fixing portion that fixes the ventilation member 1 to the opening can be provided, for example, on the surface of the gas permeable membrane 2 opposite to the surface to which the valve film 3 is bonded. The position where the fixing portion is provided and the shape of the fixing portion are not particularly limited. As an example, the fixing portion is provided at the peripheral edge of the opposite surface of the gas permeable membrane 2. At this time, the ventilation member 1 further includes a fixing portion that fixes the ventilation member 1 to the opening at the peripheral portion of the surface of the gas permeable membrane 2 opposite to the surface to which the valve film 3 is bonded. The shape of the fixed part may be a frame shape. When the fixing portion is provided on the surface of the gas permeable membrane 2, the air permeability in the film thickness direction is usually lost in the region of the gas permeable membrane 2 corresponding to the fixing portion, and therefore the portion is not the gas permeable region of the gas permeable membrane 2. . As a more specific example, when the fixing portion is a double-sided tape disposed on the surface of the gas permeable membrane 2, the region of the gas permeable membrane 2 corresponding to the double-sided tape is not included in the gas permeable region.

  FIG. 7 shows an example of the ventilation member 1 further including such a fixing portion. The ventilation member 1 shown in FIG. 7 is the same as the ventilation member 1 shown in FIG. The fixing part 11 of the ventilation member 1 shown in FIG.

  The ventilation member 1 shown in FIG. 7 further includes a fixing portion 11 that fixes the ventilation member 1 to the opening on the peripheral edge of the surface of the ventilation film 2 opposite to the surface to which the valve film 3 is bonded. The shape of the fixing portion 11 is a ring shape which is a kind of frame shape. With such a fixing portion 11, the ventilation member 1 can be fixed to the opening more stably and reliably.

  In the ventilation member 1 shown in FIG. 7, as further shown in FIG. 8, the circumferential direction of the ring-shaped region 9, which is a region where the gas permeable membrane 2 and the valve film 3 are located at the peripheral edge of the gas permeable membrane 2. The gas permeable membrane 2 is bonded to each other at the portion, and the gas permeable membrane 2 and the valve film 3 are bonded to each other when the outer periphery and inner periphery of the fixing portion 11 are viewed from the direction perpendicular to the main surface of the gas permeable membrane 2. The outer circumference and the inner circumference of the region 9 located at the peripheral edge respectively coincide with each other. By such a joining part 4 and fixing part 11, the ventilation member 1 can be more stably and reliably fixed to the opening, and at the time of ventilation of the ventilation member 1 (at the time of ventilation from the ventilation film 2 side to the valve film 3). Moreover, peeling of the ventilation member 1 from the opening can be suppressed.

  An example of a state in which the ventilation member 1 shown in FIG. 7 is fixed to the opening 12 is shown in FIG. The ventilation member 1 is fixed to the opening 12 so as to cover the opening 12. More specifically, the ventilation member 1 is fixed to the surface 14 of the wall 13 constituting the opening 12 and is fixed via the fixing portion 11. The surface 14 may be an outer surface of a housing having a wall 13 and a housing.

(Embodiment 2)
The ventilation member 1 of this embodiment shown in FIGS. 10A and 10B is similar to FIGS. 1A to 1B except that the shapes of the ventilation film 2 and the valve film 3 are square, more specifically square, and the shape of the joint 4 is different. It has the same structure as the ventilation member 1 shown in FIG. 1C. 10A shows the ventilation member 1 viewed from the side of the gas permeable membrane 2, and FIG. 10B shows a cross section II shown in FIG. 10A.

  In the ventilation member 1 of the present embodiment, as shown in FIG. 10A, the ventilation film 2 and the valve film 3 are first extended along the three sides of the rectangle in the region located at the peripheral edge of the square ventilation film 2. Are joined to each other. The joint portion 4 of the ventilation member 1 of the present embodiment corresponds to the first portion that is a part in the circumferential direction of a region located at the peripheral edge portion of the gas permeable membrane 2. The joint portion 4 has a U shape when viewed from a direction perpendicular to the main surface of the gas permeable membrane 2, more specifically, a U shape having corners at right angles. The ventilation member 1 of the present embodiment has one joint 4.

  Further, in the ventilation member 1 shown in FIGS. 10A and 10B, the gas permeable membrane 2 is bonded to the valve film 3 in the region located at the peripheral portion of the gas permeable membrane 2, A second portion that is not joined to the valve film 3 and the ventilation region of the gas permeable membrane 2 is viewed from a direction perpendicular to the main surface of the gas permeable membrane 2, and the first portion and the second portion And a line segment L connecting the end portions 15A and 15B of the first portions adjacent to each other along the circumferential direction.

  Also in the ventilation member 1 of this embodiment, the effect similar to the effect demonstrated in Embodiment 1 can be acquired according to the structure. Further, in the ventilation member 1 shown in FIGS. 10A and 10B, when the ventilation member 1 is in a steady state, the ventilation member 1 side of the ventilation member 1 through a slight gap between the ventilation membrane 2 and the valve film 3 is used. The amount of gas permeation between the surface of the valve film 3 and the surface on the valve film 3 side, for example, the amount of permeation of oxygen, can be suppressed as compared with the ventilation member 1 shown in FIGS. The amount of permeation is simply referred to as “the amount of gas (oxygen) permeation”). As a more specific example, by fixing the ventilation member 1 shown in FIGS. 10A and 10B to the opening of the ventilation container in which the internal oxygen concentration is reduced compared to the external space, the oxygen concentration in the container over time is increased. Increase can be suppressed. The effect of suppressing the gas permeation amount in the steady state is that the air permeability of the region in the vicinity of the free end of the valve film 3 depends on the relationship between the ventilation region of the ventilation membrane 2 and the first portion corresponding to the joint portion 4. This is based on the fact that the overlap with the ventilation region of the membrane 2 is suppressed. Further, in the ventilation member 1 shown in FIGS. 10A and 10B, the effect is that the valve film 3 does not have an “externally protruding portion” to be described later, so that the surface of the container to which the member 1 is fixed is It is soft and can be held more reliably even when deformation such as undulation is likely to occur on the surface.

  The modification of the ventilation member 1 of this embodiment is shown to FIG. 11A and FIG. 11B. 11A shows the ventilation member 1 viewed from the side of the ventilation membrane 2, and FIG. 11B shows a cross section II shown in FIG. 11A.

  In the ventilation member 1 shown in FIGS. 11A and 11B, one end 15A and the other end 15B of the joint portion 4 (extending along the three sides of the quadrilateral in the region located at the peripheral edge of the quadrilateral vent film 2). Both ends 15A, 15B) of the first part are set back from the remaining side 16 of the square. At this time, when viewed from the direction perpendicular to the main surface of the valve film 3, the valve film 3 protrudes outward with respect to the line segment L connecting the end portions 15A and 15B (from the line segment L in FIG. 11A). Side 16 side portion). In the valve film 3, the part is easily reversibly deformed as compared with other parts. For this reason, in the ventilation member 1 shown in FIGS. 11A and 11B, the return property of the valve film 3 deformed in the direction away from the gas permeable membrane 2 by the pressure of the gas A can be improved.

  A further modification of the ventilation member 1 of the present embodiment is shown in FIGS. 12A and 12B. 12A shows the ventilation member 1 as viewed from the side of the ventilation membrane 2, and FIG. 12B shows a cross section II shown in FIG. 12A.

  The ventilation member 1 shown in FIG. 12A and FIG. 12B has the ventilation shown in FIG. 11A and FIG. 11B, except that a fixing part 11 is provided on the peripheral edge of the surface opposite to the surface to which the valve film 3 is bonded. It has the same structure as the member 1. In the ventilation member 1 shown in FIGS. 12A and 12B, the ventilation region 17 of the ventilation membrane 2 defined by the fixing portion 11 is joined to the valve film 3 in the region located at the peripheral edge of the ventilation membrane 2. A line segment L connecting the end portions 15A and 15B of the first portion adjacent to each other along the circumferential direction across the first portion and the second portion not joined to the valve film 3 in the region; , Surrounded by For this reason, in the ventilation member 1 shown to FIG. 12A and FIG. 12B, balance with suppression of the permeation | transmission amount of the gas in a steady state and improvement of the return property of the valve film 3 can be aimed at.

  Furthermore, in the ventilation member 1 shown in FIGS. 12A and 12B, the center of the ventilation region 17 of the ventilation film 2 and the center of the valve film 3 coincide. In this case, the gas permeation amount in the steady state can be more reliably suppressed. Thereby, for example, when the ventilation member 1 is fixed to the opening of the ventilation container whose internal oxygen concentration is reduced as compared with the external space, it is possible to suppress an increase in the oxygen concentration in the container over time for a longer period of time. . It should be noted that the degree of coincidence need not be exact and can obviously have some “play”.

  The ventilation member 1 of the present embodiment can be used in the same manner as the ventilation member 1 of the first embodiment.

(Embodiment 3)
The ventilation member 1 of the present embodiment shown in FIGS. 13A and 13B has the shapes of the ventilation membrane 2 and the valve film 3 that are quadrangular, more specifically square, except that the shape of the joint 4 is different. It has the same structure as the ventilation member 1 shown in FIG. 1C. Note that FIG. 13A shows the ventilation member 1 viewed from the side of the gas permeable membrane 2, and FIG. 13B shows a cross-section II shown in FIG. 13A.

  In the ventilation member 1 of the present embodiment, as shown in FIG. 13A, the ventilation film 2 and the valve film 3 are respectively formed on two sides of the square that face each other in a region located at the peripheral edge of the square ventilation film 2. The two first portions along each other are joined to each other. The joint portion 4 of the ventilation member 1 of the present embodiment corresponds to the first portion that is a part in the circumferential direction of a region located at the peripheral edge portion of the gas permeable membrane 2. The ventilation member 1 of the present embodiment has two joint portions 4 (4A, 4B). The joints 4A and 4B have a Roman numeral “II” shape.

  Further, in the ventilation member 1 shown in FIGS. 13A and 13B, the gas permeable membrane 2 is joined to the valve film 3 in the region located in the peripheral portion of the gas permeable membrane 2, and the first portion in the region. A second portion that is not joined to the valve film 3, and the ventilation region of the gas permeable membrane 2 is viewed from a direction perpendicular to the main surface of the gas permeable membrane 2. Are surrounded by line segments L1 and L2 connecting the end portions 18 of the first portions adjacent to each other along the circumferential direction. The line segment L1 is a line segment that connects the end portion 18A and the end portion 18C adjacent to each other along the circumferential direction with the second portion along the side 19A interposed therebetween. The line segment L2 is a line segment that connects the end portion 18B and the end portion 18D adjacent to each other along the circumferential direction with the second portion along the side 19B interposed therebetween.

  Also in the ventilation member 1 of this embodiment, the effect similar to the effect demonstrated in Embodiment 1 can be acquired according to the structure. Further, in the ventilation member 1 shown in FIGS. 13A and 13B, similarly to the ventilation member 1 shown in FIGS. 10A and 10B, the gas permeation amount in a steady state, for example, the oxygen permeation amount, is shown in FIGS. 1A to 1C. It can suppress compared with the ventilation member 1 shown. Further, in the ventilation member 1 shown in FIGS. 13A and 13B, the effect is that the valve film 3 does not have the above “part protruding outward”, and thus the surface of the container to which the member 1 is fixed is soft, Even when deformation such as undulation is likely to occur on the surface, the surface can be held more reliably.

  The modification of the ventilation member 1 of this embodiment is shown to FIG. 14A and FIG. 14B. 14A shows the ventilation member 1 viewed from the side of the gas permeable membrane 2, and FIG. 14B shows a cross section II shown in FIG. 14A.

  In the ventilation member 1 shown in FIGS. 14A and 14B, the end portions 18A and 18C of the joint portion 4 (4A and 4B) (the second along the two opposite sides of the square in the region located at the peripheral edge of the square ventilation membrane 2). The end of one portion, which is the end of one side 19A selected from the remaining two sides, is set back from the side 19A. Further, the end portions 18B and 18D (the end portion of the first portion and the end portion on the other side 19B selected from the remaining two sides) of the joint portion 4 (4A and 4B) are the side 19B. Have retreated from. At this time, the valve film 3 is outward from the line segment L1 connecting the end portions 18A and 18C and the line segment L2 connecting the end portions 18B and 18D when viewed from the direction perpendicular to the main surface of the valve film 3. (A portion closer to the side 19A than the line segment L1 and a portion closer to the side 19B than the line segment L2) in FIG. 14A. In the valve film 3, the part is easily reversibly deformed as compared with other parts. For this reason, in the ventilation member 1 shown in FIGS. 14A and 14B, the return property of the valve film 3 deformed in the direction away from the gas permeable membrane 2 by the pressure of the gas A can be improved.

  In the ventilation member 1 of the present embodiment, at least one end selected from the end portions 18A to 18D of the joint portion 4 may be in the retracted state. Moreover, in the ventilation member 1 of this embodiment, the edge part by the side of one side chosen from the edge | side 19A and the edge | side 19B in joining part 4A and 4B may be in the said retracted state.

  Further, in the ventilation member 1 shown in FIGS. 14A and 14B, the ventilation region 17 of the ventilation membrane 2 defined by the fixing portion 11 is joined to the valve film 3 in the region located at the peripheral portion of the ventilation membrane 2. By the first portions and the line segments L1 and L2 connecting the end portions 18 of the first portions adjacent to each other along the circumferential direction across the second portion not joined to the valve film 3 in the region. being surrounded. For this reason, in the ventilation member 1 shown in FIGS. 14A and 14B, it is possible to achieve a balance between the suppression of the gas permeation amount in the steady state and the improvement of the return property of the valve film 3.

  Furthermore, in the ventilation member 1 shown in FIGS. 14A and 14B, the center of the ventilation region 17 of the ventilation film 2 and the center of the valve film 3 coincide with each other. In this case, the gas permeation amount in the steady state can be more reliably suppressed.

  The ventilation member 1 of the present embodiment can be used in the same manner as the ventilation member 1 of the first embodiment.

(Embodiment 4)
15A and 15B, the ventilation member 1 of the present embodiment has a fine adhesive layer 20 formed on the surface of the valve film 3 on the side of the gas permeable membrane 2 (the valve film 3 is finely formed on the surface of the gas permeable membrane 2 side. Except for having the adhesive layer 20, it has the same structure as the ventilation member 1 shown in FIGS. 12A and 12B. 15A shows the ventilation member 1 viewed from the side of the ventilation membrane 2, and FIG. 15B shows a cross section II shown in FIG. 15A.

  Also in the ventilation member 1 of this embodiment, the effect similar to the effect demonstrated in Embodiment 1 or 2 can be acquired according to the structure. Moreover, in the ventilation member 1 of this embodiment, the gas permeation amount in a steady state, for example, the oxygen permeation amount, can be further suppressed. The effect of further suppressing the gas permeation amount in the steady state is based on the fact that the valve film 3 can be more closely adhered to the gas permeable membrane 2 by the slightly adhesive layer 20 when the gas permeable member 1 is in the steady state.

  The pressure of the gas A that starts to deform in the direction in which the valve film 3 is separated from the gas permeable membrane 2 can be adjusted by the slightly adhesive layer 20. That is, the valve opening pressure (valve opening pressure) in the ventilation member 1 can be adjusted. The valve opening pressure in the ventilation member 1 in which the valve film 3 has the slight adhesion layer 20 is, for example, 10 kPa or less. Depending on the configuration of the slightly adhesive layer 20 and the configuration of the ventilation member 1, the valve opening pressure may be 8 kPa or less, 6 kPa or less, 5 kPa or less, 4 kPa or less, or 3 kPa or less. The lower limit of the valve opening pressure can be 0.3 kPa or more, 0.5 kPa or more, and further 1 kPa or more.

  The slight adhesion layer 20 is a layer comprised by an adhesive, for example. The kind of adhesive is not limited. A well-known adhesive can be used for an adhesive. The pressure-sensitive adhesive is, for example, a urethane-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, or a silicone-based pressure-sensitive adhesive. The pressure-sensitive adhesive may be a urethane pressure-sensitive adhesive or an acrylic pressure-sensitive adhesive. Urethane pressure-sensitive adhesives and silicone-based pressure-sensitive adhesives, particularly urethane-based pressure-sensitive adhesives, have high wettability with respect to the gas permeable membrane 2. For this reason, in the fine adhesion layer 20 comprised from these adhesives, the speed | rate of the close_contact | adherence of the valve film 3 with respect to the ventilation film 2 when the ventilation member 1 will be in a steady state after valve opening can be improved, for example. The acrylic adhesive has high adhesiveness to the gas permeable membrane 2. For this reason, in the fine adhesion layer 20 comprised from an acrylic adhesive, the adhesive force of the valve film 3 with respect to the ventilation film 2 can be improved, for example.

  The adhesive strength of the slightly adhesive layer 20 is, for example, 0.2 N / 20 mm or less, 0.15 N / 20 mm or less, and 0.15 N / 20 mm or less in terms of adhesive strength at normal temperature (23 ° C.) to a PET film (non-porous PET film). It may be 13 N / 20 mm or less, and further 0.11 N / 20 mm or less.

  The slightly adhesive layer 20 may be formed on the entire surface of the valve film 3 on the side of the gas permeable membrane 2 or may be formed on a part thereof. The formation method of the valve film 3 which has the slightly adhesion layer 20 is not limited. For example, the valve film 3 having the slightly adhesive layer 20 can be formed by applying an adhesive to the surface of the film used as the valve film 3 by a known method.

  The slight adhesion layer 20 is applicable also to the ventilation member 1 of other embodiment.

  The ventilation member 1 of the present embodiment can be used in the same manner as the ventilation member 1 of the first embodiment.

(Embodiment 5)
16A and 16B, the ventilation member 1 of the present embodiment has an intermediate film 31 as an intermediate member in a part of a region where the ventilation film 2 and the valve film 3 are located at the peripheral edge of the ventilation film 2. The ventilation member 1 has the same structure as the ventilation member 1 shown in FIGS. 15A and 15B except that they are joined together. 16A shows the ventilation member 1 viewed from the side of the gas permeable membrane 2, and FIG. 16B shows a cross section II shown in FIG. 16A. In the ventilation member 1 described in the first to fourth embodiments, the gas permeable membrane 2 and the valve film 3 are directly bonded to each other (directly bonded via the bonding portion 4 such as the double-sided tape 10).

  Also in the ventilation member 1 of this embodiment, the effect similar to the effect demonstrated in Embodiment 1, 2, or 4 can be acquired according to the structure. Moreover, in the ventilation member 1 of this embodiment, the gas permeation amount in a steady state, for example, the oxygen permeation amount, can be further suppressed. The effect of further suppressing the gas permeation amount in the steady state is more certain when the valve film 3 has the slightly adhesive layer 20. Moreover, the rigidity of the ventilation member 1 which can be a laminated body of a film can be improved by the intermediate film 31.

  In the ventilation member 1 of the present embodiment, the joining portion 4 is formed on the intermediate film 31 disposed on the ventilation film 2 via the fixing portion 32. The configuration such as the shape of the joint 4 may be the same as the configuration of the joint 4 in each of the embodiments described so far.

  The intermediate member is typically a film (intermediate film 31) that does not have air permeability in the film thickness direction. The intermediate film 31 may be a nonporous nonporous film. The intermediate film 31 that does not have air permeability in the film thickness direction does not have a gas ventilation path on the surface. For this reason, the smoothness of the surface can be improved as compared with the gas permeable membrane 2, and the degree of adhesion when the valve film 3 is in contact with the surface can be improved. By this improvement, the gas permeation amount in the steady state can be more reliably suppressed.

  The material constituting the intermediate film 31 is not limited, and may be a polymer, a metal, and a composite material thereof. The intermediate film 31 is, for example, a polymer film, and a more specific example is a non-porous PET film. By using the intermediate film 31 that is a polymer film, for example, when the valve film 3 has the slight adhesion layer 20, it is possible to prevent the valve opening pressure of the ventilation member 1 from becoming excessively high. This is because polymer films generally tend to have lower adhesive strength than metal films.

  The thickness of the intermediate film 31 is, for example, 3 to 200 μm, and can be 25 to 100 μm.

  The shape of the intermediate film 31 is not limited. The intermediate film 31 can have the shape of the peripheral edge of the gas permeable membrane 2. In the example shown in FIGS. 16A and 16B, the shape of the intermediate film 31 is the same as the shape of the fixed portion 11.

  In the fixing portion 32, the gas permeable membrane 2 and the intermediate film 31 can be bonded by, for example, welding such as heat welding and ultrasonic welding, bonding with an adhesive or an adhesive, or a bonding member such as a double-sided tape. Further, the fixing part 32 may have the same configuration as the fixing part 11. The fixed portion 32 of the ventilation member 1 shown in FIGS. 16A and 16B is configured by a double-sided tape.

  The shape of the fixing part 32 is not limited. The shape of the fixing part 32 may be the shape of the peripheral part of the gas permeable membrane 2. The shape of the fixing part 32 may be the same as the shape of the intermediate film 31 and / or the fixing part 11. In the example illustrated in FIGS. 16A and 16B, the shape of the fixing portion 32 is the same as the shape of the intermediate film 31 and the fixing portion 11.

  The intermediate member 31 can also be applied to the ventilation member 1 of other embodiments.

  The ventilation member 1 of the present embodiment can be used in the same manner as the ventilation member 1 of the first embodiment.

  The ventilation member of the present invention can be supplied, for example, in a form arranged on a sheet-like base film or in a form placed on a belt-like base film and wound on a roll or a reel. The fixing part 11 can be used for arranging the ventilation member on the base film. A release layer that facilitates peeling of the member from the base film may be formed on the surface of the base film on which the ventilation member is disposed when the ventilation member is used. As the base film, for example, a polymer film, paper, a metal film, and a composite film thereof can be used.

(Ventilated housing, vented container)
The use of the ventilation member of the present invention is not limited. The ventilation member of the present invention can be used, for example, by being fixed to openings of various cases and containers that require air permeability. Since the ventilation member of the present invention has asymmetric air permeability, it can be suitably used for various housings and containers that require asymmetric air permeability. The ventilation member of the present invention can also be used for various cases and containers that require unsteady ventilation. Note that the requirement of unsteady air permeability means that air permeability is required only during a specific period, for example, during heating.

  An example of the ventilation container provided with the ventilation member of this invention is shown in FIG. A ventilation container 21 shown in FIG. 17 is a food container that generates gas during storage, and the ventilation member 1 is fixed to the opening thereof. The ventilation member 1 is fixed to the outer surface side of the opening of the container 21 so that the valve film 3 side faces the outside of the container 21 and the ventilation film 2 side faces the inside of the container 21. In the ventilation container 21, the introduction of air (oxygen) from the outside to the inside of the container 21 can be suppressed while the gas generated from the food is discharged to the outside by the ventilation member 1. Moreover, intrusion of foreign matter such as dust and water from the outside to the inside of the container 21 can be suppressed, and depending on the configuration of the gas permeable membrane 2, a solid container such as liquid and debris derived from food as the contents of the container 21 21 can be prevented from leaking to the outside.

  An example of a ventilation housing provided with the ventilation member of the present invention is shown in FIG. A ventilation housing 22 shown in FIG. 18 is a lamp housing, and the ventilation member 1 is fixed to the opening thereof. The ventilation member 1 is fixed to the outer surface side of the opening of the casing 22 so that the valve film 3 side faces the outside of the casing 22 and the ventilation membrane 2 side faces the inside of the casing 22. In the ventilation casing 22, the pressure decreased due to the temperature decrease after the lamp was extinguished while the gas inside the casing 22 whose pressure was increased by the heat at the time of lamp lighting was discharged to the outside of the casing 22 by the ventilation member 1. Invasion of water vapor from the outside to the inside of the housing 22 can be suppressed. Since water vapor that has entered the inside of the housing 22 causes condensation, the ventilation member 1 suppresses the occurrence of condensation within the housing 22. In addition, entry of foreign matter such as dust and water from the outside to the inside of the housing 22 can be suppressed.

  Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to the following examples.

  Initially, the evaluation method of the ventilation member produced in Examples 1-7 and Comparative Examples 1-3 is shown.

[Air permeability]
The air permeability (air permeability resistance) of the ventilation member was evaluated based on the Gurley number (unit: second / 100 mL) measured in accordance with JIS P8117. At this time, a stainless steel disc having a diameter of 47 mm provided around an opening having a diameter of 2 mm is prepared, and the ventilation member which is an evaluation object is made to coincide with each other so as to cover the opening. The Gurley number was measured in a state of being attached to the disk by the above method. In addition, the Gurley number finally obtained for each ventilation member sample (Gurley number shown in Table 1) is the same as the area of the ventilation region of the ventilation member sample evaluated as described above, and the Gurley number actually measured as described above. Based on the air passage area of 642 mm ² which is the reference of the upper Gurley number, the value was converted per air passage area (642 mm ² ) of the latter. All the Gurley numbers of the ventilation members described in this specification are the converted values.

[Waterproof]
The waterproofness of the ventilation member was evaluated by the water pressure resistance measured in accordance with JIS L1092. Specifically, it is as follows.

A stainless steel disc having a diameter of 47 mm provided with an opening having a diameter of 2 mm at the center (having a thickness that does not deform during water pressure resistance measurement) was prepared. Next, a ventilation member as a measurement target was fixed to one surface of the disk so as to cover the opening. The ventilation member was fixed by the fixing portion 11 or the fixing portion 105 so that the center of the ventilation film included in the member coincided with the center of the opening. Next, the water pressure resistance of the ventilation member was measured in accordance with method A (low water pressure method) or method B (high water pressure method) described in JIS L1092, using the disc on which the ventilation member was fixed as a test piece. The water pressure was applied to the test piece from the surface opposite to the surface on which the ventilation member was fixed. In addition, the water pressure when water droplets were observed even at one place on the gas permeable membrane or the fixing portion as viewed from the side of the surface of the test piece where the gas permeable member was fixed was defined as the water pressure resistance of the gas permeable member. As the test apparatus, an apparatus having the same configuration as the test apparatus exemplified in JIS L1092 can be used except that it has a structure (test piece mounting structure) capable of measuring the water pressure resistance of the test piece. Based on the measured water pressure resistance, the waterproofness of the ventilation member was evaluated according to the following criteria.
A (Excellent): The value of the water pressure resistance was 50 kPa or more.
○ (good): The water pressure resistance was 3 kPa or more and less than 50 kPa.
Δ (possible): The value of the water pressure resistance was 1 kPa or more and less than 3 kPa.
X (impossible): The value of the water pressure resistance was less than 1 kPa.

Example 1
In Example 1, the ventilation member 1 shown in FIGS. Specifically, a liquid-repellent circular PET film having a plurality of through-holes in the film thickness direction as the gas permeable film 2 (the air permeability in the film thickness direction is the number of fragiles measured in accordance with JIS L1096) Displayed as 12.0 cm ³ / (cm ² · sec), water pressure resistant 18 kPa, thickness 45 μm, diameter 9 mm, transparent), and non-porous PET film (circular, thickness 50 μm, diameter 9 mm, transparent) as the valve film 3 ) Was prepared.

A PET film as the gas permeable film 2 was prepared as follows. Non-porous commercially available PET film having a plurality of through holes penetrating in the film thickness direction (it4ip, Track etched membrane; thickness 45 μm, through hole diameter 5.0 μm, through hole density 2.3 × 10 ⁶ Pieces / cm ² ). Next, this film is immersed in a liquid repellent treatment solution for 3 seconds, then removed from the treatment solution, and left to dry at room temperature for 30 minutes, thereby forming a liquid repellent layer on the surface of the film. Processing was carried out. The liquid repellent treatment solution is a solution obtained by diluting a water and oil repellent “X-70-042” manufactured by Shin-Etsu Chemical Co., Ltd. with a diluent (Asahi Clin AE-3000, manufactured by Asahi Glass Co., Ltd.) to a concentration of 0.1% by weight. Was used. “X-70-042” is a water / oil repellent composed of a polymer obtained by polymerizing a compound having a linear fluoroalkyl group as a monomer represented by the following chemical formula: CH _{2 = CHCOOCH 2 CH 2 C 5 F} 10 CH 2 C 4 F 9. In this way, a PET film (a through hole diameter of 5.0 μm, a porosity of 45.1%, a through hole density of 2.3 × 10 ⁶ pieces / cm ² ), which is the gas permeable membrane 2, was obtained.

  Next, two double-sided tapes with an outer diameter of 9 mm and an inner diameter of 6 mm (Nitto Denko, No. 5603, thickness 30 μm) are prepared, and one of them is a straight line passing through the center of the ring (ring diameter). A straight line corresponding to) was divided into two as cutting lines. Next, one of the two-sided double-sided tapes is pasted on the surface of the gas permeable membrane 2 so that the outer circumferences coincide with each other, and the valve film 3 is pasted on the double-sided tapes so The gas permeable membrane 2 and the valve film 3 were joined using the double-sided tape 10 as the joint 4. As shown in FIG. 4, the gas permeable membrane 2 and the valve film 3 are part of the circumferential direction of the ring-shaped region 9 located at the peripheral edge of the gas permeable membrane 2 (180 ° as an angle with respect to the center of the ring). In the region). Next, another double-sided tape that is not divided into two parts is bonded as a fixing portion 11 to the surface of the gas permeable membrane 2 opposite to the joint surface of the valve film 3 so that the outer circumferences coincide with each other, as shown in FIGS. The ventilation member 1 shown was obtained. The ventilation region of the ventilation member is a circular region having the inner periphery of the ring-shaped double-sided tape bonded to the opposite surface of the ventilation film 2 as a circumference (in other examples and comparative examples). Is the same). The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Example 2)
A ventilation member 1 was obtained in the same manner as in Example 1 except that the inner diameter of the ring-shaped double-sided tape used for the joint portion 4 and the fixing portion 11 was changed from 6 mm to 4 mm. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Example 3)
A ventilation member in the same manner as in Example 1 except that the inner diameter of the ring-shaped double-sided tape used for the joint portion 4 and the fixing portion 11 was changed from 6 mm to 4 mm and the thickness of the valve film 3 was changed from 50 μm to 25 μm. 1 was obtained. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

Example 4
When one of two prepared double-sided tapes is divided into two, each of the two straight lines that pass through the center of the ring and whose crossing angle at the center of the ring is 90 ° is cut. A ventilation member 1 was obtained in the same manner as in Example 1 except that the larger piece of the double-sided tape divided into two was used for the joint 4 between the ventilation film 2 and the valve film 3. As shown in FIG. 19, the gas permeable membrane 2 and the valve film 3 are part of the circumferential direction of the ring-shaped region located at the peripheral edge of the gas permeable membrane 2 (at an angle of 270 ° with respect to the center of the ring). In the region, the portions are joined to each other as the joint portion 4. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Example 5)
Ventilation membrane 2 is changed from the above PET membrane to a circular PTFE porous membrane (manufactured by Nitto Denko, NTF1133, Gurley number in the film thickness direction 1.8 sec / 100 mL, water pressure resistance 60 kPa, thickness 80 μm, diameter 9 mm, white) A ventilation member 1 was obtained in the same manner as in Example 1 except that. The PTFE porous film used in Example 5 is a film that has been subjected to a liquid repellent treatment by the same liquid repellent treatment agent and liquid repellent treatment method as in Example 1. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Example 6)
The ring-shaped double-sided tape used for the fixing part 11 is not changed, and the ring-shaped double-sided tape used for the joint part 4 is a double-sided tape having a thickness of 100 μm (Nitto Denko, No. 5610, outer diameter 9 mm and inner diameter 6 mm). The ventilation member 1 was obtained in the same manner as in Example 1 except that the above was changed. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Example 7)
A ventilation member in the same manner as in Example 1 except that the inner diameter of the ring-shaped double-sided tape used for the joint portion 4 and the fixing portion 11 was changed from 6 mm to 7 mm, and the thickness of the valve film 3 was changed from 50 μm to 25 μm. 1 was obtained. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Comparative Example 1)
In Comparative Example 1, the ventilation member 100 shown in FIGS. 20A and 20B was produced. 20B is a view of the ventilation member 100 shown in FIG. 20A as viewed from the slit film 101 side. As the gas permeable membrane 103, the same PET membrane as the PET membrane used in the gas permeable membrane 2 of Example 1 was prepared. Moreover, as shown in FIG. 20A and FIG. 20B, as the slit film 101, two linear slits (length 3 mm, interval 2 mm between the slits) 102 penetrating in the film thickness direction of the film are provided. A circular PET film (thickness 50 μm, diameter 9 mm, transparent) was prepared. Next, two pieces of ring-shaped double-sided tape (Nitto Denko, No. 5603, thickness 30 μm) having an outer diameter of 9 mm and an inner diameter of 6 mm are prepared. Laminated to each surface. Next, the air-permeable membrane 103 and the slit film 101 were joined using one double-sided tape as the joint 104. The gas permeable membrane 103 and the slit film 101 were joined to each other in the entire circumferential direction of the ring-shaped region located at the peripheral edge of the gas permeable membrane 103. The slit film 101 does not have a ventilation path in the film thickness direction other than the slit. The other double-sided tape bonded to the gas permeable membrane 103 was used as the fixing portion 105. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Comparative Example 2)
A PET film (thickness 50 μm, diameter) having three linear slits (length 3 mm) 102 that penetrates the slit film 101 in the film thickness direction of the film and intersects at an equal angle at the center of the circular film. The ventilation member 110 shown in FIGS. 21A and 21B was obtained in the same manner as in Comparative Example 1 except that the thickness was changed to 9 mm and transparent. 21B is a view of the ventilation member 110 shown in FIG. 21A as viewed from the slit film 101 side. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

(Comparative Example 3)
In Comparative Example 3, a ventilation member without the ventilation film 2 was produced. Specifically, the ventilation member was obtained in the same manner as in Example 1 except that a ring-shaped PET film (thickness 50 μm) having an outer diameter of 9 mm and an inner diameter of 6 mm was used instead of the ventilation film 2. The evaluation results of the ventilation member thus produced are shown in Table 1 below.

  As shown in Table 1, in each ventilation member of the example, while ensuring waterproofness, the ventilation from the valve film 3 side to the ventilation film 2 direction can be more reliably suppressed, and the ventilation film 2 side can also be controlled. The ratio B / A of the Gurley number in the direction of the gas permeable membrane 2 from the valve film 3 side to the Gurley number in the direction of the film 3 can be increased, and the degree of freedom in controlling the ratio is increased.

(Example 8)
About the ventilation member produced in Example 1, when the pressure of the gas A permeate | transmitted from the ventilation film 2 side to the direction of the valve film 3 (added to the ventilation member, the ventilation film 2 side is a positive differential pressure) is increased. Changes in the amount of gas per unit time (mL / min) permeating the gas permeable membrane 2 and the gas permeable member, and the pressure of the gas B trying to permeate from the valve film 3 toward the gas permeable membrane 2 (applied to the gas permeable member) The change in the amount of gas per unit time permeating through the gas permeable membrane 2 and the gas permeable member when the valve film 3 side was increased) was evaluated. The evaluation results are shown in FIG. In FIG. 22, the former case is referred to as “the ventilation side (of the ventilation member)”, and the latter case is referred to as “the sealing side (of the ventilation member)”.

  As shown in FIG. 22, in the ventilation member, asymmetrical air permeability is realized by a slight differential pressure with the ventilation membrane 2 side being positive, and the asymmetric air permeability is maintained even when the differential pressure is large. I was able to.

  The evaluation method of the ventilation member produced in Examples 9-14 and Comparative Example 4 is shown.

[Valve opening pressure]
The valve opening pressure, which is the pressure of the gas A at which the ventilation member opens, was measured as follows.

  A 47 mm diameter stainless steel disc (having a thickness that does not deform when measuring the valve opening pressure) with a 2 mm diameter opening as the center was prepared. Next, a ventilation member as a measurement target was fixed to one surface of the disk so as to cover the opening. The ventilation member was fixed by the fixing portion 11 or the fixing portion 105 so that the center of the ventilation film included in the member coincided with the center of the opening. Next, the disk which fixed the ventilation member was made into the test piece, and the said test piece was fixed to the fixing jig 204 of the evaluation apparatus shown in FIG.

  The fixing jig 204 is a bottomed cylindrical body having a circular cross section, and has a structure capable of fixing the test piece 201 to which the ventilation member 203 is fixed to the opening. A pipe 205 to which a flow meter 206, a pressure gauge 207, a regulator 208 and a pump 209 are connected is connected to the bottom of the fixed jig 204. In the fixing jig 204, when the test piece 201 is fixed to the opening, the pipe 205 is excluded, and only the opening 202 of the test piece 201 and the ventilation member 203 fixed to the opening 202 are vented from the outside to the inside of the fixing jig 204. It has a route structure. The test piece 201 was fixed to the opening of the jig 204 so that the surface fixing the ventilation member 203 faces the inside of the fixing jig 204.

  Next, the pump 209 was driven and pressure reduction inside the fixed jig 204 was started via the pipe 205. The decompression speed was set to 10 kPa / min by the regulator 208. Along with the start of decompression, measurement of the flow rate of air passing through the inside of the pipe 205 was started by the flow meter 206. Then, the pressure P in the fixed jig 204 was recorded when the flow rate was 0.01 L / min or more and the flow rate suddenly increased beyond the flow rate calculated from the pressure reduction rate. A value obtained by subtracting the pressure P from the atmospheric pressure at the time of measurement was defined as a valve opening pressure of the ventilation member.

[Air permeability]
The air permeability (air permeability resistance; Gurley number) of the ventilation member was measured by the same method as the measurement method of the air permeability of the ventilation members prepared in Examples 1 to 7 and Comparative Examples 1 to 3. In addition, when the valve opening pressure exceeds the differential pressure of 1.22 kPa with respect to the evaluation object as defined in JIS P8117, the above-mentioned differential pressure is set to a pressure exceeding the valve opening pressure, and the air resistance is measured. A value obtained by converting the value per differential pressure of 1.22 kPa was defined as the Gurley number of the ventilation member.

[Airflow per unit time]
Apart from the air permeability (air resistance), when the pressure difference (gas A pressure) between the air membrane side surface of the ventilation member and the valve film or slit film side surface is 1.5 kPa The flow rate (air flow rate) of air per unit time passing through the member was evaluated. In addition, this value was made into zero in the ventilation member whose valve opening pressure exceeds 1.5 kPa. The air flow rate was measured as follows.

  A 47 mm diameter stainless steel disc (having a thickness that does not deform when measuring the air flow rate) with an opening having a diameter of 2 mm at the center was prepared. Next, a ventilation member as a measurement target was fixed to one surface of the disk so as to cover the opening. The ventilation member was fixed by the fixing portion 11 or the fixing portion 105 so that the center of the ventilation film included in the member coincided with the center of the opening. Next, the disk that fixes the ventilation member is used as a test piece, and the test piece is placed on the fixing jig 204 of the evaluation device (see FIG. 25) used for measuring the valve opening pressure when the valve opening pressure is measured. Fixed in the same manner.

  Next, the pump 209 was driven, and the inside of the fixing jig 204 was depressurized via the pipe 205. The pressure was reduced by the regulator 208 so that the internal pressure of the fixing jig 204 was 1.5 kPa lower than the atmospheric pressure at the time of measurement. After the internal pressure of the fixing jig 204 was stabilized, the flow rate of the air passing through the inside of the pipe 205 was measured by the flow meter 206, and the air flow per unit time was obtained.

[Returnability]
The returnability of the ventilation member was evaluated as follows.

  The valve opening pressure (initial opening pressure) of the ventilation member to be evaluated was measured by the method for measuring the valve opening pressure described above. Next, the internal space of the fixing jig 204 was opened through the pipe 205, and the pressure in the fixing jig 204 was returned to atmospheric pressure. After returning to atmospheric pressure for about 1 minute, the valve opening pressure of the ventilation member was measured again by the above method. When the measured value again decreases by 1 kPa or more from the initial opening pressure, “△ (possible)”, and when it decreases by more than 0.5 kPa and less than 1 kPa, “◯ (good)”, when less than 0.5 kPa When it decreased, it was designated as “◎ (excellent)”.

[Oxygen permeation in steady state]
The oxygen permeation amount in the steady state of the ventilation member was measured as follows.

  An opening that fits in a range surrounded by the fixing portion 11 or the fixing portion 125 of each ventilation member when the ventilation member was fixed was provided in an aluminum pouch bag having an internal capacity of 2000 mL (manufactured by GL Sciences, AAK-2). Next, the ventilation member was fixed to the outer surface of the bag via the fixing part 11 or the fixing part 125 so as to cover the opening. Next, nitrogen gas was circulated through the cock at a flow rate of 300 mL / min for 5 minutes. After circulation for 5 minutes, the bag containing about 300 mL of nitrogen gas was sealed by heat sealing, and stored at room temperature without applying pressure exceeding the valve opening pressure of the ventilation member to the bag. After the elapse of a predetermined period (one day, five days, or seven days after heat sealing), the oxygen concentration in the bag is measured with an oxygen concentration meter (RO-103S, manufactured by Iijima Denshi Kogyo Co., Ltd.). The oxygen permeation amount of the ventilation member in the state was evaluated. When the oxygen concentration immediately after heat sealing (initial oxygen concentration) was separately measured, the initial oxygen concentration was in the range of 0.01 to 0.03% in any of the ventilation members.

Example 9
In Example 9, the shapes of the gas permeable membrane 2 and the valve film 3 were square, and the gas permeable membrane 2 and the valve film 3 extended along the three sides of the square in the region located at the peripheral edge of the gas permeable membrane 2. The ventilation member 1 (refer FIG. 12A and FIG. 12B) mutually joined by the junction part 4 in the part was produced. However, the end portions 15A and 15B of the joint portion 4 of the ventilation member 1 manufactured in Example 9 are in the same position as the remaining one side 16 (side 16), like the ventilation member 1 shown in FIGS. 10A and 10B. Did not retreat from). The width of the joint portion 4 (except for the corner portion, the width in the direction perpendicular to the direction in which the joint portion 4 extends, hereinafter the same) was 2 mm.

As the gas permeable membrane 2, a square (size 20 mm × 20 mm) PET film having a plurality of through holes in the film thickness direction was prepared. The air permeability in the film thickness direction of the prepared PET film is 20.0 cm ³ / (cm ² · sec) in terms of the number of fragiles measured in accordance with JIS L1096, the water pressure resistance is 2 kPa, and the thickness is 12 μm. The PET film was transparent.

  A PET film as the gas permeable film 2 was prepared as follows. A non-porous PET film having a thickness of 12 μm was prepared. Next, a plurality of through-holes having a hole diameter of 21.5 μm extending linearly in a direction perpendicular to the main surface of the PET film were formed on the prepared PET film by a through-hole forming process using a laser. The through holes were formed so that the openings were evenly arranged with respect to the surface of the PET film, and the porosity of the surface of the PET film was 6.45%. The porosity of the surface is the ratio of the total value of the areas of the through-holes existing on the surface to the surface area.

  For the valve film 3, the same PET film as the valve film 3 used in Example 1 was prepared except that it was a square (size 20 mm × 20 mm).

  Next, a U-shaped double-sided tape (Nitto Denko, No. 5603, thickness 30 μm, width 2 mm) having a right-angled corner, which is a joint portion 4, is prepared, Affixed to the surface. Furthermore, the valve film 3 was bonded onto the bonded double-sided tape so that the outer circumferences coincided, and the gas permeable membrane 2 and the valve film 3 were bonded using the double-sided tape as the bonding portion 4.

  Next, the outer peripheral size is 20 mm × 20 mm, the inner peripheral size is 10 mm × 10 mm, and the frame-shaped double-sided tape (Nitto Denko Corporation) having a right-angled corner in which the center of the outer periphery coincides with the center of the inner periphery. Product, No. 5603, thickness 30 μm) was prepared and bonded to the surface of the gas permeable membrane 2 opposite to the joint surface of the valve film 3 as the fixing portion 11 so that the outer peripheries coincided. Thus, the ventilation member 1 of Example 9 was obtained.

  In Example 9, in addition to the vent member 1 produced above, two types of vent members using a PET film having a slightly adhesive layer 20 as the valve film 3 were prepared by changing the type of the slightly adhesive layer 20. . Specifically, a film (Nitto Denko, AW303, thickness 50 μm, fine) in which a fine adhesive layer 20 composed of a urethane-based adhesive is formed on one surface of the valve film 3 (size 20 mm × 20 mm square). A film (Nitto Denko, RP207, 60 μm thick, slightly adhesive layer) on one side of which the adhesive layer has an adhesive strength of 0.04 N / 20 mm and a fine adhesive layer 20 composed of an acrylic adhesive Adhesive strength of 0.11 N / 20 mm). The valve film 3 was joined to the gas permeable membrane 2 so that the slightly adhesive layer 20 faces the gas permeable membrane 2. Similarly, in the ventilation members of the following examples and comparative examples using a valve film or a slit film having a slight adhesion layer, the ventilation film and the valve film or slit film are arranged so that the slight adhesion layer faces the ventilation film. Were joined.

  The adhesive strength of the slightly adhesive layer in the prepared valve film was evaluated as follows at normal temperature (23 ° C.). First, the PET film (width 20 mm, length 150 mm) on which the fine adhesion layer to be evaluated is formed on one surface is passed through the entire surface of the fine adhesion layer of the film, and has a thickness of 100 μm. To PET film (Toray, Lumirror S10). Next, a roller having a weight of 2 kg was reciprocated once on the valve film, and then the joined body was left for 30 minutes. Next, a 180 ° peel test in which the film having the slightly adhesive layer is peeled off from the PET film at a peeling speed of 300 mm / min is carried out, and the maximum value of the peeling force measured at that time is measured as the slightly adhesive layer. The adhesive strength was. The method for measuring the adhesive strength of the slightly adhesive layer is the same for AW343 and RP109C described later.

  Table 2 below shows the evaluation results of the three types of ventilation members produced in this manner and having different valve films 3. “PET” in the column of “Type of valve film or slit film” in Table 2 means a valve film or slit film that does not have a slightly adhesive layer. The three types of ventilation members produced in Example 9 all satisfied the same Gurley number B and Gurley number ratio B / A as in Examples 1-7. Further, the Gurley number A when the valve film 3 did not have the slightly adhesive layer 20 was 1.1 seconds / 100 mL.

(Example 10)
In Example 10, the shape of the gas permeable membrane 2 and the valve film 3 is a square, and the gas permeable membrane 2 and the valve film 3 are provided on each of two opposite sides of the square in the region located at the peripheral edge of the gas permeable membrane 2. The ventilation member 1 (refer FIG. 14A and FIG. 14B) mutually joined by the junction part 4 in the part along was produced. However, the end portions 18A to 18D of the joint portion 4 of the ventilation member 1 manufactured in Example 10 were set at the same positions as the sides 19A and 19B (the sides 19A and 19B, similarly to the ventilation member 1 shown in FIGS. 13A and 13B). I did not retreat from 19B). The width of the joint 4 was 2 mm.

  For the gas permeable membrane 2 and the valve film 3, the PET membrane and the PET film used in Example 9 were prepared, respectively.

  Next, a pair of strip-shaped double-sided tapes (No. 5603, manufactured by Nitto Denko, 30 mm thick, 20 mm long, 2 mm wide) as the joints 4 are prepared, and each double-sided tape is placed in the length direction of the double-sided tape. Were attached to the surface of the gas permeable membrane 2 so that the sides of the gas permeable membrane 2 coincided with the sides of the gas permeable membrane 2 and the two double-sided tapes were along each of the two opposite sides of the gas permeable membrane 2. Furthermore, the valve film 3 was bonded onto the bonded double-sided tape so that the outer periphery of the gas-permeable film 2 coincided with the outer periphery, and the gas-permeable film 2 and the valve film 3 were bonded using the double-sided tape as the bonding portion 4.

  Next, the same frame-shaped double-sided tape as that prepared in Example 9 was prepared, and the fixing portion 11 was provided on the surface of the gas permeable membrane 2 opposite to the joint surface of the valve film 3 so that the outer periphery coincided. Pasted together. Thus, the ventilation member 1 of Example 10 was obtained.

  Further, in Example 10, in addition to the ventilation member 1 produced above, two types of ventilation members using a PET film having a slight adhesion layer 20 as the valve film 3 were prepared by changing the type of the slight adhesion layer 20. . Specifically, a film (manufactured by Nitto Denko, manufactured by Nitto Denko Co., Ltd.) on the one side of the valve film 3 (size 20 mm × 20 mm square) used in Example 9 and formed from a urethane adhesive. AW303) and a film (manufactured by Nitto Denko, RP207) having a fine adhesive layer 20 composed of an acrylic adhesive formed on one surface thereof were used.

  Table 2 below shows the evaluation results of the three types of ventilation members produced in this manner and having different valve films 3. In addition, all the three types of ventilation members produced in Example 10 satisfied the same Gurley number B and Gurley number ratio B / A as in Examples 1-7. Further, the Gurley number A when the valve film 3 did not have the slightly adhesive layer 20 was 0.43 sec / 100 mL.

(Example 11)
In Example 11, the ventilation member 1 in which the shape of the ventilation film 2 and the valve film 3 was a circle was produced in the same manner as in Example 1 except that a PET film having the slight adhesion layer 20 was used for the valve film 3. The valve film 3 was a film (Nitto Denko, AW303) used in Example 9, in which a fine adhesive layer 20 composed of a urethane-based adhesive was formed on one surface. However, the film was a circle having a diameter of 9 mm.

  The evaluation results of the ventilation member thus produced are shown in Table 2 below together with the evaluation results of the ventilation member produced in Example 1. The ventilation member produced in Example 9 satisfied the same Gurley number B and Gurley number ratio B / A as in Example 1.

Example 12
In Example 12, by changing the shape of the double-sided tape used as the joint portion 4, the end portions 15 </ b> A and 15 </ b> B of the joint portion 4 are retreated from the side 16 of the gas permeable membrane 2, and the urethane adhesive is used. A ventilation member 1 was produced in the same manner as in Example 9 except that the valve film 3 (AW303, manufactured by Nitto Denko) having the slightly adhesive layer 20 formed on one surface was used (FIGS. 15A and 15B). reference). The end portions 15A and 15B of the joint portion 4 are configured such that the line segment L connecting the end portions 15A and 15B passes through a position 2 mm away from the ventilation region 17 of the ventilation member 1 (ventilation film 2) toward the side 16 side.

  The evaluation results of the ventilation member thus produced are shown in Table 2 below. In addition, the ventilation member produced in Example 12 satisfy | filled the ratio B / A of the Gurley number B and the Gurley number similar to Examples 1-7.

(Example 13)
In Example 13, by changing the shape of the double-sided tape used as the fixing portion 11, the shape of the ventilation region 17 of the ventilation film 2 is changed to a 10 mm × 13 mm rectangle, and the joining portion 4 in the ventilation film 2 is not formed. Except for extending the ventilation region 17 by 3 mm in the direction of the side 16 and using a film (AW303, manufactured by Nitto Denko Corporation) in which the fine adhesive layer 20 made of urethane-based adhesive is formed on one surface for the valve film 3 Produced the ventilation member 1 in the same manner as in Example 9 (see FIGS. 23A and 23B).

  The evaluation results of the ventilation member thus produced are shown in Table 2 below. In addition, the ventilation member produced in Example 13 satisfy | filled the ratio B / A of the Gurley number B and the Gurley number similar to Examples 1-7.

(Example 14)
In Example 14, a film having an intermediate film 31 and a fixing portion 32 for fixing the intermediate film 31 to the gas permeable membrane 2 and a fine adhesive layer 20 made of a urethane-based adhesive formed on one surface ( A ventilation member 1 shown in FIGS. 16A and 16B was produced in the same manner as in Example 12 except that AW303) manufactured by Nitto Denko Corporation was used for the valve film 3.

  The fixed film 31 was a non-porous PET film (thickness 50 μm) having the same shape as the fixed portion 11. The fixing part 32 was the same double-sided tape as the fixing part 11.

  In the ventilation member 1 of Example 14, the fixing portion 32 is bonded to one surface of the gas permeable membrane 2, the intermediate film 31 is bonded to the fixing portion 32, and the bonding portion 4 is further bonded to the intermediate film 31. Then, after the valve film 3 was bonded, the fixing portion 11 was bonded to the surface of the gas permeable membrane 2 opposite to the surface where the fixing portion 32 was bonded. When pasting each member, the outer periphery of each member was made to coincide.

  In Example 14, in addition to the ventilation member 1 produced above, three types of ventilation members 1 in which the type of the slightly adhesive layer 20 was changed were prepared. Specifically, the film (Nitto Denko's AW343, made of Nitto Denko), on which the valve film 3 (size 20 mm × 20 mm) is formed with the above-mentioned RP207 and the fine adhesive layer 20 made of urethane-based adhesive on one surface of the PET film. , Thickness 65 μm, adhesive strength of the fine adhesive layer 0.03 N / 20 mm), and film (Nitto Denko, RP109C, thickness) on which the fine adhesive layer 20 composed of an acrylic adhesive is formed on one surface 55 μm, the adhesive strength of the slightly adhesive layer was 0.07 N / 20 mm).

  Table 2 below shows the evaluation results of the four types of ventilation members produced in this manner and having different valve films 3. The four types of ventilation members produced in Example 14 all satisfied the same Gurley number B and Gurley number ratio B / A as in Examples 1-7.

(Comparative Example 4)
In Comparative Example 4, the ventilation member 120 shown in FIGS. 24A and 24B was produced. 24B is a cross-sectional view taken along a cross-section II of the ventilation member 120 illustrated in FIG. 24A.

  As the gas permeable membrane 123, the same PET film as the PET film used in the gas permeable membrane 2 of Example 9 was prepared. As the slit film 121, as shown in FIGS. 24A and 24B, a square PET film (size 20 mm × 20 mm) having one linear slit (length 5 mm) 122 that penetrates in the film thickness direction of the film. , Thickness 50 μm, transparent). The position of the slit 122 was set to 4 mm from the side 127 closest to the slit 122 in the slit film 121.

  Next, a frame-shaped double-sided tape having a right-angled corner (the outer peripheral size is 20 mm × 20 mm, the inner peripheral size is 10 mm × 10 mm, and the center of the outer periphery coincides with the center of the inner periphery) Nitto Denko, No. 5603, 30 μm thick) was prepared, and was bonded to one surface of the gas permeable membrane 123 as a fixing portion 125 so that the outer periphery matched. Next, a frame-shaped double-sided tape having a right-angled corner (the outer periphery size is 20 mm × 20 mm, the inner periphery size is 18 mm × 18 mm, and the center of the outer periphery coincides with the center of the inner periphery) Nitto Denko, No. 5603, 30 μm in thickness) was prepared, and bonded to the other surface of the gas permeable membrane 123 as a bonding portion 124 so that the outer circumferences matched. Next, the slit film 121 was joined on the gas permeable membrane 123 with the double-sided tape as the joining portion 124 so that the outer periphery coincided. The gas permeable membrane 123 and the slit film 121 were joined to each other in the entire circumferential direction of the region located at the peripheral edge of the gas permeable membrane 123. The slit film 121 does not have a ventilation path in the film thickness direction other than the slit 122. When viewed from a direction perpendicular to the main surface of the gas permeable membrane 2, the slit 122 does not overlap with the gas permeable region 126 of the gas permeable membrane 123 defined by the fixing portion 125.

  Further, in Comparative Example 4, two types of ventilation members using PET films having a slightly adhesive layer as the slit film 121 were prepared separately from the above-prepared ventilation members by changing the type of the slightly adhesive layer. Specifically, a film (Nitto Denko, AW303) in which a fine adhesive layer composed of the urethane-based adhesive used in Example 9 is formed on one surface, except that the slit film 121 has a slit 122, and A film (manufactured by Nitto Denko, RP207) in which a slightly adhesive layer composed of an acrylic adhesive was formed on one surface was used.

  Table 2 below shows the evaluation results of the three types of ventilation members manufactured in this manner and having different slit films 121. The Gurley number B and the Gurley number ratio B / A of the three types of ventilation members produced in Comparative Example 4 were all the same as those of the ventilation member produced in Comparative Example 1 or 2.

(Comparative Example 5)
In Comparative Example 5, a ventilation member without the ventilation film 2 was produced. Specifically, a ventilation member was obtained in the same manner as in Example 14 except that the same PET film as the intermediate film 31 was used instead of the ventilation film 2. The evaluation results of the ventilation member thus produced are shown in Table 2 below. The waterproofness of the ventilation member produced in Comparative Example 5 was “× (impossible): water pressure resistance value of less than 1 kPa” based on the above-mentioned criteria.

  As shown in Table 2, the oxygen permeation amount in the steady state was reduced for the ventilation member of the example compared to the ventilation member of Comparative Example 4. Moreover, when the shape of a junction part was the same, the permeation | transmission amount of the said oxygen could be reduced more because a valve film has a slightly adhesion layer. In the ventilation member of Comparative Example 4, whether or not the slit film had the slight adhesion layer did not affect the oxygen transmission amount in the steady state. In Example 14 having an intermediate film, it was possible to suppress the oxygen permeation amount at a high level for a longer period of time. In the vent member of the example, the valve opening pressure could be adjusted depending on the presence and type of the slightly adhesive layer in the valve film. The ventilation member of Comparative Example 5 was not provided with a gas permeable membrane, and the waterproof evaluation result of the ventilation member was not possible.

  The present invention can be applied to other embodiments without departing from the spirit and essential characteristics thereof. The embodiments disclosed in this specification are illustrative in all respects and are not limited thereto. The scope of the present invention is shown not by the above description but by the appended claims, and all modifications that are equivalent in meaning and scope to the claims are included therein.

  The ventilation member of the present invention can be used for the same applications as conventional ventilation members, for example, a housing and a container that require air permeability. The ventilation member of the present invention can be used particularly for a housing and a container that require asymmetric air permeability.

DESCRIPTION OF SYMBOLS 1 Ventilation member 2 Ventilation film 3 Valve film 4 Joint part 5 Peripheral part 6 (not joined to the valve film 3 of the ventilation film 2) 6 Free end part (of the valve film 3) 7 Gap 8 Ventilation path 9 (of the ventilation film 2 ) Peripheral area 10 Double-sided tape 11 Fixing part 12 Opening 13 Wall 14 Surface 15A, 15B End part 16 Side 17 Ventilation area 18A, 18B, 18C, 18D End part 19A, 19B Side 20 Slight adhesive layer 31 Intermediate film 32 Fixing part DESCRIPTION OF SYMBOLS 100,110 Ventilation member 101 Slit film 102 Slit 103 Ventilation film 104 Joining part 105 Fixed part 120 Venting member 121 Slit film 122 Slit 123 Venting film 124 Junction part 125 Fixing part 126 Venting area 127 Side 201 Test piece 202 Opening 203 Venting member 204 Fixed jig 205 Piping 206 Flow meter 20 Pressure gauge 208 regulator 209 pump

Claims (17)

In a state fixed to the opening, a waterproof and dustproof breathable membrane through which gas passing through the opening passes,
A valve film disposed so as to cover the ventilation region of the ventilation membrane,
The gas permeable membrane and the valve film are bonded to each other directly or via an intermediate member at a part of the peripheral edge of the gas permeable membrane,
The region of the valve film that is not joined to the gas permeable membrane can be reversibly deformed in a direction away from the gas permeable membrane by the pressure of gas that passes through the gas permeable membrane in the direction of the valve film.
The gas that passes through the gas permeable membrane in the direction of the valve film passes between the gas permeable membrane and the valve film deformed in the separating direction, and is joined to the valve film of the gas permeable membrane. A ventilation member that is discharged in the direction of the peripheral edge.   The ventilation member according to claim 1, wherein the ventilation film and the valve film have the same shape and area.   The ventilation member according to claim 1, wherein a shape of the gas permeable membrane and / or the valve film is a circle, an ellipse, or a polygon.   The ventilation member according to claim 1, wherein the gas permeable membrane and the valve film are joined to each other in a part in a circumferential direction of a region located at a peripheral edge of the gas permeable membrane. The gas permeable membrane has at least one first portion joined to the valve film in a region located in the peripheral edge portion, and a second portion not joined to the valve film in the region. ,
The ventilation region of the gas permeable membrane is viewed from a direction perpendicular to the main surface of the gas permeable membrane,
The at least one first portion;
Two end portions of the at least one first portion, and at least one line segment connecting the two end portions adjacent to each other along the circumferential direction across the second portion;
The ventilation member according to claim 4 surrounded by. The gas permeable membrane has at least one first portion joined to the valve film in a region located in the peripheral edge portion, and a second portion not joined to the valve film in the region. ,
The valve film is two end portions of the at least one first portion as viewed from a direction perpendicular to the main surface of the valve film, and extends along the circumferential direction with the second portion interposed therebetween. The ventilation member according to claim 4, wherein the ventilation member has a portion protruding outward with respect to a line segment connecting the two adjacent end portions.   The ventilation member according to claim 1, wherein the valve film has a slight adhesion layer on a surface on the ventilation membrane side.   The ventilation member according to claim 7, wherein the slightly adhesive layer is composed of a urethane-based adhesive, an acrylic-based adhesive, or a silicone-based adhesive.   The ventilation member according to claim 7, wherein the adhesive force of the slightly adhesive layer at 23 ° C to a polyethylene terephthalate (PET) film is 0.2 N / 20 mm or less.   The ventilation member according to claim 1, wherein the ventilation film and the valve film are directly bonded by a double-sided tape.   The ventilation member according to claim 1, wherein the intermediate member is a film having no air permeability in a film thickness direction.   The ventilation member according to claim 1, further comprising a fixing portion that fixes the ventilation member to the opening at a peripheral portion of a surface of the ventilation membrane opposite to a surface to which the valve film is bonded.   The ventilation member according to claim 12, wherein the fixing portion is constituted by a double-sided tape.   The ventilation member according to claim 1, wherein the Gurley number from the valve film side to the ventilation film is 10 seconds / 100 mL or more.   2. The ventilation member according to claim 1, wherein a ratio of a Gurley number from the gas permeable membrane side to the valve film direction to a Gurley number from the valve film side to the gas permeable membrane direction is 10 or more. The ventilation member according to any one of claims 1 to 15 is fixed to the opening of the housing,
The ventilation member is fixed to the opening such that the side of the valve film faces the outside of the case and the side of the ventilation film faces the inside of the case. The ventilation member according to any one of claims 1 to 15 is fixed to the opening of the container,
The ventilation member is fixed to the opening so that the valve film side faces the outside of the container and the ventilation film side faces the inside of the container.

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