Membrane sheet for preventing condensation in ammunition storage case, and waterproof and air-permeable vent for preventing condensation in ammunition storage case including same

Abstract

Disclosed are: a membrane sheet for preventing condensation in an ammunition storage case; and a waterproof and air-permeable vent for preventing condensation in the ammunition storage case, the waterproof and air-permeable vent including the membrane sheet. The membrane sheet for preventing condensation in an ammunition storage case according to the present invention comprises: a lower support layer; an upper reinforcement layer disposed above the lower support layer; and a nanofiber layer arranged between the lower support layer and the upper reinforcement layer. In particular, the nanofiber layer is made of a polymer material having nano-sized pores and formed by electrospinning. The present invention is based on nanofibers with excellent moisture permeability and waterproofing performance and thus efficiently controls moisture release and more reliably blocks the inflow of outside moisture, and accordingly, can prevent the corrosion of ammunition and significantly improve storage reliability and quality.

Description

Membrane sheet for preventing condensation in ammunition storage cases and waterproof breathable vent for preventing condensation in ammunition storage cases including the same

[0001] The present invention relates to a membrane sheet, and more particularly to a membrane sheet for preventing condensation in an ammunition storage case applied to an ammunition storage case for the purpose of discharging moisture and blocking the ingress of external moisture, and a waterproof and breathable vent for preventing condensation in an ammunition storage case including the same.

[0002] Ammunition plays a pivotal role in the military and defense industries, making its stable long-term storage crucial. The quality of ammunition is heavily dependent on the storage environment, and failure to provide adequate protection against external environmental factors during storage can severely compromise its safety and reliability.

[0003] One of the factors that critically affects the ammunition storage environment is moisture and condensation. When condensation occurs due to the difference between external and internal temperatures, internal humidity rises, causing metal components to corrode. This can significantly degrade the chemical stability and quality of the ammunition. In particular, condensation occurs frequently in high-humidity environments or regions with small temperature fluctuations, adversely impacting the quality of ammunition storage.

[0004] The intrusion of external air, dust, and fine contaminants also acts as a cause that weakens the reliability of ammunition packaging. If these factors enter the ammunition, they can have negative effects, such as triggering chemical reactions or shortening the storage period.

[0005] Currently, widely used Ammo Cans are made of metal and provide robust airtightness, but they cannot completely block temperature fluctuations within the interior and the effects of external environmental factors. Consequently, moisture buildup is inevitable, which is highly likely to lead to quality degradation during long-term storage.

[0006] As one of the technologies to solve this problem, Korean Registered Patent No. 10-2100384 presents an ammunition packaging case equipped with air vent technology using a membrane. This technology is characterized by installing a vent membrane filter on the lid of the ammunition packaging case to discharge internal moisture to the outside, thereby reducing the occurrence of condensation and blocking external moisture from entering the interior, thereby protecting the interior from moisture.

[0007] The ePTFE (expanded Polytetrafluoroethylene) based membrane disclosed in Korean Registered Patent No. 10-2100384 has physical properties such as high chemical resistance, heat resistance, and a low coefficient of friction, but it has the disadvantage that the moisture discharge rate is relatively slow due to the low-density pore structure, performance in extremely humid environments is insufficient, and effectiveness is limited in environments where condensation forms quickly.

[0008] Accordingly, there is a need for more innovative membrane technology that can overcome existing limitations and for air vent designs that apply this technology.

[0009] The matters described in the background technology above are intended to aid in understanding the background of the invention and may include matters that are not disclosed prior art.

[0010] The problem that the present invention aims to solve is to provide a nanofiber-based membrane sheet for preventing condensation in an ammunition storage case with excellent moisture permeability and waterproof performance, which can improve storage reliability and quality by preventing quality degradation or ammunition corrosion caused by condensation and external moisture ingress that may occur in the storage environment of the ammunition storage case, and a waterproof and breathable vent for preventing condensation in an ammunition storage case including the same.

[0011] Another problem that the present invention aims to solve is to provide a nanofiber-based membrane sheet for preventing condensation in an ammunition storage case, which can ensure durability and maximize condensation prevention performance by designing the structure of the membrane sheet in multiple layers, and a waterproof and breathable vent for preventing condensation in an ammunition storage case including the same.

[0012] Another problem that the present invention aims to solve is to provide a membrane sheet for preventing condensation in an ammunition storage case and a waterproof and breathable vent for preventing condensation in an ammunition storage case that includes the same, which has a precise and high-density micropore structure by applying a nanofiber layer produced in a multilayer structure through electrospinning, thereby enabling rapid moisture discharge even in extremely humid environments and stably exhibiting moisture permeability and waterproof performance.

[0013] Another problem that the present invention aims to solve is to provide a membrane sheet for preventing condensation in an ammunition storage case that improves mechanical strength and protection performance against external contaminants, and a waterproof and breathable vent for preventing condensation in an ammunition storage case that includes the same.

[0014] According to one aspect of the present invention as a means of solving the problem, a membrane sheet for preventing condensation in an ammunition storage case is provided, comprising a lower support layer, an upper reinforcing layer disposed on top of the lower support layer, and a nanofiber layer disposed between the lower support layer and the upper reinforcing layer, wherein the nanofiber layer is made of a polymer material having nano-sized micropores through electrospinning.

[0015] In a membrane sheet for preventing condensation in an ammunition storage case according to one aspect of the present invention, the lower support layer may include a support portion having a porous mesh structure composed of metal or fiber material.

[0016] In a membrane sheet for preventing condensation in an ammunition storage case according to one aspect of the present invention, the lower support layer is disposed on the upper part of the support portion and may further include a lower reinforcing portion having a woven fabric or non-woven fabric structure.

[0017] In a membrane sheet for preventing condensation in an ammunition storage case according to one aspect of the present invention, the lower reinforcing member may be made of one or a combination of polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and nylon.

[0018] In a membrane sheet for preventing condensation in an ammunition storage case according to one aspect of the present invention, the upper reinforcing layer may be formed of a woven fabric or a non-woven fabric structure.

[0019] In a membrane sheet for preventing condensation in an ammunition storage case according to one aspect of the present invention, the upper reinforcing layer may be made of one or a combination of polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and nylon.

[0020] In a membrane sheet for preventing condensation in an ammunition storage case according to one aspect of the present invention, the nanofiber layer comprises a polymer material layer having a nanoweb structure formed through electrospinning, wherein the polymer material layer may be configured to have a multilayer structure.

[0021] In a membrane sheet for preventing condensation in an ammunition storage case according to one aspect of the present invention, the nanofiber layer may be made of one of PVDF, Nylon, PI, PBI, TPU, or a combination thereof.

[0022] According to another aspect of the present invention as a means of solving the problem, a waterproof and breathable vent for preventing condensation in an ammunition storage case is provided, comprising a membrane sheet for preventing condensation in an ammunition storage case according to the aforementioned aspect.

[0023] According to another aspect of the present invention, the waterproof and breathable vent for preventing condensation in an ammunition storage case comprises a body having a through hole formed in the center, a seating projection protruding from the upper surface of the body, and a membrane sheet installed on the seating projection, wherein the membrane sheet may include a first region in which the edge is seated on the upper surface of the seating projection and positioned above the through hole, and a second region outside the first region.

[0024] In a waterproof and breathable vent for preventing condensation in an ammunition storage case according to another aspect of the present invention, the edge of the first region of the membrane sheet may be joined to the upper surface of the seating projection through heat fusion, and the second region of the membrane sheet may be joined to the side of the seating projection through heat fusion.

[0025] In another aspect of the present invention, a waterproof and breathable vent for preventing condensation in an ammunition storage case may be formed such that the diameter (D1) of the first region corresponds to the outer diameter (D2) of the seating projection, and the width (W1) of the second region corresponds to the height (H) of the seating projection.

[0026] According to the present invention, a nanofiber layer produced by electrospinning forms a high-density nano-sized micropore structure, which efficiently discharges internal moisture and blocks the inflow of external moisture, thereby preventing condensation.

[0027] In addition, by preventing metal corrosion that may occur due to condensation and external moisture, the chemical stability and physical quality of ammunition can be maintained for a long period, thereby significantly improving the reliability of ammunition storage.

[0028] In addition, due to the micropore structure of the nanofiber layer and the characteristics of the polymer material, high moisture permeability and water resistance are provided simultaneously, allowing for stable function even in extremely humid environments.

[0029] In addition, by forming the membrane sheet with a multilayer structure including an upper reinforcing layer and a lower support layer, the mechanical strength of the membrane sheet can be secured and the protection performance against external contaminants and physical damage can be improved.

[0030] In addition, through various combinations of polymer materials (PVDF, Nylon, PI, PBI, TPU, etc.), the membrane sheet can operate effectively even in environments with extreme temperature changes and humidity, thereby meeting the strict storage standards required in the military and defense industries.

[0031] In addition, by producing a nanofiber layer through electrospinning, it is possible to mass-produce membrane sheets of uniform quality, and there is an advantage that it is possible to manufacture them economically while improving the condensation prevention performance of ammunition storage cases.

[0032] FIG. 1 shows a schematic cross-sectional view of a membrane sheet for preventing condensation in an ammunition storage case according to an embodiment of the present invention.

[0033] FIG. 2 is a schematic diagram showing how a membrane sheet according to an embodiment of the present invention is manufactured through an electrospinning process.

[0034] FIG. 3 is a Scanning Electron Microscope (SEM) image showing the surface structure of a nanofiber layer applied to a membrane sheet according to an embodiment of the present invention, and is a diagram showing the pore distribution and fiber orientation state of the nanofiber layer.

[0035] FIG. 4 is a perspective view of a waterproof and breathable vent for preventing condensation in an ammunition case according to another embodiment of the present invention.

[0036] Fig. 5 is an exploded perspective view of the waterproof breathable vent shown in Fig. 4.

[0037] FIG. 6 is a cross-sectional view of a waterproof and breathable vent for preventing condensation in an ammunition case according to another embodiment of the present invention, viewed from the direction of line AA in FIG. 4.

[0038] FIG. 7 is a cross-sectional view of a waterproof and breathable vent for preventing condensation in an ammunition case according to another embodiment of the present invention, viewed from the direction of line BB in FIG. 4.

[0039] FIG. 8 is an example of a usage state showing a waterproof and breathable vent installed in an ammunition storage case according to another embodiment of the present invention.

[0040] FIG. 9 is a diagram showing an air exhaust path in which air is discharged from inside an ammunition storage case to the outside through a waterproof and breathable vent according to another embodiment of the present invention.

[0041] FIG. 10 is a schematic diagram of the main parts of a waterproof and breathable vent according to another embodiment of the present invention, showing an enlarged view of a membrane sheet and a seating projection portion to which the membrane sheet is joined.

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] The embodiments are provided to more fully explain the invention to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the invention is not limited to the following embodiments. Rather, these embodiments are provided to make the disclosure more faithful and complete and to fully convey the spirit of the invention.

[0044] The terms used herein are for describing specific embodiments and are not intended to limit the invention. Additionally, the singular form in this specification may include the plural form unless the context clearly indicates otherwise.

[0045] In this application, terms such as "comprising," "having," and "having" are intended to specify the existence of features, numbers, steps, actions, components, parts, or combinations thereof of the invention, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0046] And, unless there are special circumstances, the fact that a component is "in front," "rear," "upper," or "lower" of another component includes not only being placed in direct contact with the other component at the "front," "rear," "upper," or "lower" of it, but also cases where another component is placed in between. Furthermore, the fact that a component is "connected" to another component includes not only being directly connected to each other, but also being indirectly connected to each other, unless there are special circumstances.

[0047] The drawings are intended solely to facilitate an understanding of the concept of the present invention and should not be interpreted as limiting the scope of the invention. Additionally, relative thicknesses, lengths, or sizes in the drawings may be exaggerated for convenience and clarity of explanation.

[0048] Anti-condensation membrane sheet for ammunition storage cases

[0049] The membrane sheet according to the embodiment can play an important role in preventing condensation in the ammunition storage case. The membrane sheet according to the embodiment can be included as a key component in the waterproof and breathable vent to be described later, and the waterproof and breathable vent including it can be installed at a designated location on the lid or body of the ammunition storage case to effectively discharge internal moisture and block the inflow of external moisture.

[0050] FIG. 1 is a drawing for explaining a membrane sheet according to an embodiment of the present invention, showing a schematic cross-sectional view of the membrane sheet. For reference, in FIG. 1, the thickness of each layer of the membrane sheet is arbitrarily set for convenience of explanation, but it should be clearly stated that the actual thickness ratio between layers of the membrane sheet is not limited to the thickness ratio shown in the drawing.

[0051] Referring to FIG. 1, a membrane sheet (20) according to an embodiment includes a lower support layer (201), an upper reinforcing layer (206) disposed on top of the lower support layer (201), and a nanofiber layer (204) disposed between the lower support layer (201) and the upper reinforcing layer (206). That is, the membrane sheet (20) according to an embodiment can be formed as a sandwich structure in which the upper reinforcing layer (206) and the lower support layer (201) are laminated on the upper and lower sides of the drawing, centered around the nanofiber layer (204).

[0052] In the embodiment, the nanofiber layer (204) may be made of a polymer material. The polymer material may be composed of, for example, one of PVDF (Polyvinylidene Fluoride), Nylon (polyamide), PI (Polyimide), PBI (Polybenzimidazole), and TPU (Thermoplastic Polyurethane), or a combination thereof. The nanofiber layer (204) includes a polymer material layer with a nanoweb structure formed through an electrospinning process, and such polymer material layer may be configured to be formed in a multilayer structure.

[0053] For reference, the polymer materials constituting the nanofiber layer (204) each have unique characteristics and exhibit excellent performance under various environmental conditions. Nylon and PI are polymer materials with high temperature stability and excellent mechanical strength, making them suitable for environments requiring high temperatures and physical loads. PVDF provides chemical resistance, heat resistance, and excellent durability, making it advantageous for environments with moisture and chemical corrosion. PBI is a high-performance polymer that maintains stable physical and chemical properties even under extreme temperatures and chemical conditions, and TPU has excellent flexibility and durability, allowing it to withstand impact and repetitive stress.

[0054] As the polymer material layer with a nano web structure is formed in a multilayer structure, the nanofiber layer (204) can have nano-sized micropores formed much more densely with a much higher density compared to a single-layer structure. Accordingly, the moisture discharge rate can be controlled more effectively compared to a single-layer structure, and at the same time, the effect of blocking external moisture ingress more reliably can be achieved. Such characteristics can contribute significantly to improving the long-term storage reliability of the ammunition storage case.

[0055] The polymer material layer having a nanoweb structure constituting the nanofiber layer (204) may be a structure formed by fiber strands (204a) having an average diameter of 200 nm irregularly crossing and bonding to each other through electrospinning. A number of nano-sized micropores (204b) acting as air passages are formed in this polymer material layer, wherein the micropores (204b) refer to nano-sized gaps or spaces created by the crossing between fiber strands (204a) (see enlarged view of the main part of FIG. 1).

[0056] In forming a nanofiber layer (204) through electrospinning, a spinning solution containing a polymer material and a solvent can be formed by spinning it through a spinning nozzle (50) to a collector (60) as shown in FIG. 2. Here, the solvent may be N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), acetone, N-methyl-2-pyrrolidone (NMP), chloroform, dichloromethane, acetic acid, formic acid, etc., but is not limited to these.

[0057] The content of the polymer material in the spinning solution may be in the range of 10% to 20% by weight relative to 100% by weight of the total. If the content of the polymer material in the spinning solution is too low, such as less than 10% by weight, the overall performance of the nanofiber layer (204), including water pressure resistance, may be reduced. On the other hand, if the content of the polymer material exceeds 20% by weight, it may be difficult to form pores in the nanofiber layer (204) or the mechanical properties of the fiber may be reduced due to an excessively densified structure.

[0058] The spinning solution may additionally contain an adhesive polymer. The adhesive polymer may include a thermoplastic resin with a relatively low melting point. For example, it may include a butyral-based resin or an epoxy-based resin. More specifically, it may include an epoxy-based thermoplastic resin such as a bisphenol-A-based, bisphenol-F-based, cresol novolac-based, or phenoxy-based epoxy resin.

[0059] The content of the adhesive polymer may be in the range of 2% to 10% by weight of the polymer material content. If the content of the adhesive polymer is too low, less than 2% by weight of the polymer material content, the adhesion between the polymer fiber strands and the interfacial adhesion between the nanofiber layer (204), the lower support layer (201), and the upper reinforcing layer (206) may be insufficient, and separation between fiber strands or separation of layers (separation of the nanofiber layer, the lower support layer, and the upper reinforcing layer) may occur during the aging process due to external pressure or long-term use. On the other hand, if the content of the adhesive polymer material exceeds 10% by weight, clogging of the pores may occur during the process of bonding the lower support layer (201) and the upper reinforcing layer (206).

[0060] The lower support layer (201) included in the membrane sheet (20) according to the embodiment may include a support member (202). Additionally, the lower support layer (201) may further include a lower reinforcing member (203) disposed on the upper part of the support member (202). The support member (202) may be formed as a porous mesh structure composed of metal or fiber material, and the lower reinforcing member (203) may be formed as a woven fabric or non-woven fabric structure.

[0061] The porous mesh structure can provide mechanical support by forming a mesh-shaped support (202) made of, for example, metal or fiber, and forming a cross-shaped structure like a net. The woven fabric is formed by fibers composed of polyethylene terephthalate (PET), nylon, etc., being woven in a certain way to form a rigid structure, and the non-woven fabric is formed by fibers being woven without heating and can be made mainly of materials such as polypropylene (PP) and polyethylene (PE).

[0062] For reference, the expression 'unheated entanglement' means that two materials or fibers combine or intertwine without applying heat.

[0063] The lower reinforcing member (203) and the support member (202) can be firmly bonded to each other through an adhesive layer (not shown) formed between them. For example, the adhesive layer may be a silicone-based adhesive, a polyurethane adhesive, an acrylic adhesive, a polymer-based adhesive, etc. Such adhesives are suitable because they can achieve a strong bond between the lower reinforcing member (203) and the support member (202) without blocking pores.

[0064] Here, when selecting an adhesive, it is important to consider pore size and density to choose a product that can bond properly without clogging the pores.

[0065] The upper reinforcing layer (206) placed on the upper surface of the nanofiber layer (204) in the drawing can be formed as a woven fabric or a non-woven fabric structure. The woven fabric is a structure formed by fibers composed of polyethylene terephthalate (PET), nylon, etc., being woven in a certain way to form a rigid structure, and the non-woven fabric is a structure formed by fibers being woven without heating, and can be made mainly of materials such as polypropylene (PP) and polyethylene (PE).

[0066] The upper reinforcing layer (206) may be formed with a thickness equal to or greater than the thickness of the lower reinforcing part (203) of the same material. Its main role is to reinforce the rigidity of the membrane sheet (20) to support the nanofiber layer (204) in maintaining its shape and performing stable performance. Additionally, the upper reinforcing layer (206) protects the nanofiber layer (204) from external pressure or impact, thereby improving the durability and service life of the membrane sheet (20).

[0067] As previously mentioned, the nanofiber layer (204) may contain an adhesive polymer. Therefore, when manufacturing the membrane sheet (20) according to the embodiment, the nanofiber layer (204), the lower support layer (201), and the upper reinforcing layer (206) can be firmly interfacially bonded to each other through a thermal fusion process (e.g., thermal fusion using a rolling roll method) performed at a specific temperature. Additionally, thermal fusion can be applied between the polymer material layers of the nanoweb structure constituting the nanofiber layer (204) to form a multilayer nanofiber layer (204).

[0068] Water-repellent and oil-repellent treatment can be performed on the surface of the membrane sheet (20) according to the embodiment. For example, a method of coating the surface of the membrane sheet (20) with a fluorine-based water-repellent and oil-repellent chemical solution having a repeating unit carbon number of 6 or less may be used. If necessary, the membrane sheet (20) after the water-repellent and oil-repellent treatment is completed may be thermally cured at a specific temperature to further improve the interlayer bonding strength and the stability of the water-repellent and oil-repellent coating layer.

[0069] Figure 3 is a Scanning Electron Microscope (SEM) image showing the surface structure of a nanofiber layer applied to a membrane sheet according to an embodiment of the present invention, showing the pore distribution and fiber orientation state of the nanofiber layer. For reference, the SEM image of Figure 3 was taken at a magnification of 10,000 times, and the voltage was set to 5 kV.

[0070] Referring to the SEM image in Fig. 3, it can be seen that the nanofiber layer is composed of fiber strands with an average diameter of about 200 nm, and that nano-sized micropores are formed by irregularly intersecting fiber strands.

[0071] According to the membrane sheet for preventing condensation in an ammunition storage case according to an embodiment of the present invention, a nanofiber layer produced by electrospinning forms a high-density nano-sized micropore structure to efficiently discharge internal moisture and block the inflow of external moisture, thereby preventing the occurrence of condensation.

[0072] In addition, by preventing metal corrosion that may occur due to condensation and external moisture, the chemical stability and physical quality of ammunition can be maintained for a long period, thereby significantly improving the reliability of ammunition storage.

[0073] In addition, due to the micropore structure of the nanofiber layer and the characteristics of the polymer material, high moisture permeability and water resistance are provided simultaneously, allowing for stable function even in extremely humid environments.

[0074] In addition, by forming the membrane sheet with a multilayer structure including an upper reinforcing layer and a lower support layer, the mechanical strength of the membrane sheet can be secured and the protection performance against external contaminants and physical damage can be improved.

[0075] In addition, through various combinations of polymer materials (PVDF, Nylon, PI, PBI, TPU, etc.), the membrane sheet can operate effectively even in environments with extreme temperature changes and humidity, thereby meeting the strict storage standards required in the military and defense industries.

[0076] In addition, by producing a nanofiber layer through electrospinning, it is possible to mass-produce membrane sheets of uniform quality, and there is an advantage that it is possible to manufacture them economically while improving the condensation prevention performance of ammunition storage cases.

[0077] Waterproof and breathable vents for preventing condensation in ammunition storage cases

[0078] Next, we will look at a waterproof and breathable vent for preventing condensation in an ammunition storage case, which includes the aforementioned membrane sheet for preventing condensation in an ammunition storage case.

[0079] FIG. 4 is a perspective view of a waterproof and breathable vent for preventing condensation in an ammunition case according to another embodiment of the present invention, and FIG. 5 is an exploded perspective view of the waterproof and breathable vent shown in FIG. 4. FIG. 6 is a cross-sectional view of a waterproof and breathable vent according to another embodiment of the present invention viewed from the direction of line AA in FIG. 4, and FIG. 7 is a cross-sectional view of a waterproof and breathable vent viewed from the direction of line BB in FIG. 3.

[0080] Referring to FIGS. 4 to 7, a waterproof and breathable vent (1) according to another embodiment includes a body (10). Additionally, it includes a cap member (30) spaced apart from the upper part of the body (10) and a membrane sheet (20) that is partially joined and fixed to a seating projection (12) protruding from the upper surface of the body (10) and spaced apart from the upper part of the body (10) and protected by the cap member (30).

[0081] The membrane sheet (20) applied in this embodiment has the same configuration as the membrane sheet according to the previously described embodiment. Therefore, a detailed description of the configuration of the membrane sheet (20) is omitted to avoid duplication, and the following description focuses on the arrangement method of the membrane sheet (20) and its combination relationship with other components.

[0082] The cap member (30) can be coupled to the body (10) in a structure that is spaced apart from the membrane sheet (20) by a predetermined distance through a support rib (16) that protrudes higher from the upper surface of the body (10) than the seating projection (12). The membrane sheet (20) and the cap member (30) are spaced apart from each other by the support rib (16), and thus a passage (second passage, p2) through which air can enter and exit can be formed between the spaced-apart parts (between the membrane and the cap member).

[0083] The body (10) may be composed of a lower body portion (100) and an upper head portion (102) with a cross-sectional area relatively larger than that of the body portion (100). The body portion (100) may be in the shape of a screw with screw threads formed on its outer surface as shown in the example of the drawing, but is not limited thereto, and the head portion (102) may be in the shape of a polygonal bolt head, but is likewise not limited to the shape of a bolt head.

[0084] The waterproof and breathable vent (1) according to the present embodiment can be coupled (e.g., screw coupled) to a ventilation hole formed in a target object, such as a housing, through the body portion (100). In this case, the head portion (102) can be in close contact with the outer surface of the target object and serve to stably support the state in which the body portion (100) is coupled to the ventilation hole (e.g., screw coupled).

[0085] Although not illustrated, the body portion (100) may be configured in a cylindrical shape having one or more snap-fit ​​joints depending on the case.

[0086] A through hole (104) that penetrates vertically may be formed in the center of the body (10). The through hole (104) may be formed in a structure that completely penetrates the center of the body part (100) and the center of the head part (102), and may be installed in a suitable location of the ammunition storage case (80, see FIG. 8 hereinafter), such as the lid or a designated location on the main body, so that the internal air of the ammunition storage case escapes to the outside through the through hole (104) or the external air flows into the interior of the ammunition storage case, thereby preventing condensation and corrosion of the ammunition caused by this.

[0087] A seating projection (12) may be formed on the upper surface of the body (10) to which a portion of the membrane sheet (20) is joined through heat fusion. The seating projection (12) may protrude to a predetermined height from the upper surface of the body (10). Preferably, the seating projection (12) may be formed in a structure that protrudes to a predetermined height from the upper surface of the body (10) while surrounding the upper entrance of the through hole (104) exposed to the upper surface of the body (10).

[0088] The seating projection (12) may be formed in a ring shape with an inner diameter larger than the diameter of the through hole (104) and aligned with the center of the through hole (104) exposed to the upper surface of the body (10). In this case, the membrane sheet (20) is separated from the upper entrance (notation omitted) of the through hole (104) by the seating projection (12), and air passes through the relatively wide surface area of ​​the membrane sheet (20), so that heat inside the target object can be discharged more effectively.

[0089] The body (10) may be made of a plastic injection molded product (e.g., polymer material) including a seating protrusion (12), and the cap member (30) may also be made of a plastic injection molded product. If the body (10) including the seating protrusion (12) is made of a plastic material, stable and robust thermal fusion between the seating protrusion and the membrane is possible when considering the material characteristics of the membrane sheet (20), thereby improving the sealing performance of the joint (c).

[0090] A membrane sheet (20) can be installed on the mounting projection (12) such that a portion (a first area, 22 described later) covers the upper opening of the mounting projection (12) and is positioned above the through hole (104), and the remaining portion (a second area, 24 described later) can be firmly fixed by being joined to the side (outer surface) of the mounting projection (12) or the side and surrounding bottom surface (140) by a heat fusion method.

[0091] The membrane sheet (20) can effectively block the penetration of particulate foreign substances and moisture from the outside while allowing air to pass through smoothly, thereby providing excellent breathability. The membrane sheet (20) can be attached to the seating protrusion (12) and is positioned at the boundary between the first passage (p1) formed by the through hole (104) of the body (10) and the second passage (p2) formed between the upper surface of the body (10) and the cap member (30) by the support rib (16), thereby preventing the penetration of foreign substances and moisture from the outside to the inside while enabling a smooth flow of air.

[0092] The membrane sheet (20) can be fixed to the mounting projection (12) of the body (10) through heat fusion. Preferably, a portion can be directly bonded and fixed to the side (outer surface) of the mounting projection (12) or to the side of the mounting projection (12) and the surrounding bottom surface (140) through ultrasonic heat fusion. In some cases, a portion can be directly bonded and fixed to the upper surface and side (outer surface) of the mounting projection (12) or to the upper surface and side of the mounting projection (12) and the surrounding bottom surface (140) through ultrasonic heat fusion.

[0093] According to this, a portion of the membrane sheet (20) is directly bonded and fixed to the mounting projection (12) of the body (10) through heat fusion, thereby eliminating the need for a separate membrane fixing component such as a fixing member. Since the fixing component is omitted, it is advantageous in terms of product miniaturization and cost-effectiveness, and defects such as deformation or tearing of the membrane caused by the fixing component can also be prevented.

[0094] The aforementioned support rib (16) may be formed on the upper surface of the body (10). The support rib (16) serves to connect the body (10) and the cap member (30), and at the same time, supports the cap member (30) by keeping it spaced apart from the membrane sheet (20) by a predetermined distance. Preferably, the support rib (16) may be formed in a column shape at a distance along the circumferential direction on the upper edge of the head portion (102) constituting the body (10).

[0095] The support rib (16) can protrude higher than the seating projection (12) on the upper surface of the body (10), more specifically on the upper surface of the head portion (102). Accordingly, the cap member (30) can be spaced apart from the membrane sheet (20) by a distance corresponding to the predetermined height, and thereby the second passage (p2), which is a predetermined space through which air can flow between the membrane sheet (20) and the lower surface of the cap member (30), can be formed.

[0096] A cap member (30) is seated on the support rib (16), and the cap member (30) seated on the support rib (16) can be firmly joined to the support rib (16) through heat fusion. Preferably, the cap member (30) and the support rib (16) can be firmly joined to each other through high-frequency heat fusion performed while the upper portion of the support rib (16) is inserted into the coupling groove (32) formed on the lower surface of the cap member (30) corresponding to each of the support ribs (16).

[0097] A target projection (160) may be formed at a predetermined height on the upper surface of the support rib (16). The target projection (160) is intended to facilitate high-frequency targeting. During high-frequency thermal fusion, the ease of high-frequency targeting can be ensured by the target projection (160), and accordingly, accurate high-frequency irradiation at a desired location can be achieved, thereby improving the quality of the thermal fusion and the reliability of the product.

[0098] Due to the support ribs (16) arranged at intervals, a side air passage (p3) can be formed between adjacent support ribs (16). At this time, the upper surface of the body (10) located between adjacent support ribs (16) can be formed as a downwardly inclined surface (103). As a result, the side air passage (p3) can be partitioned in a shape in which the width gradually widens from the inside to the outside (see FIG. 9 later).

[0099] According to this configuration (a configuration in which the width of the side air passage, partitioned by adjacent support ribs and the inclined surface between them, gradually widens from the inside to the outside), heated air inside the object in which the ventilation vent (1) is installed can be rapidly discharged to the outside by spreading through the side air passage (p3), and the inflow of moisture or foreign substances from the outside can be effectively prevented or suppressed.

[0100] The support rib (16) may be positioned at a distance from the outer side of the seating projection (12). Additionally, a groove (14) may be formed on the upper surface of the body (10) between the support rib (16) and the seating projection (12) that are positioned at a distance, specifically on the upper surface of the head portion (102). At this time, the groove (14) may be formed by being recessed to a predetermined depth from the upper surface of the body (10) adjacent to the side of the seating projection (12).

[0101] As described above, the cap member (30) is fixed at a predetermined distance from the upper surface of the body (10) through the support rib (16), and thus a passage (second passage, p2) through which air enters and exits is formed between them (between the upper surface of the body and the cap member). That is, the breathable vent according to the embodiment of the present invention is a structure in which air enters and exits through the passage (p2) formed by the body (10) and the cap member (30) being spaced apart from each other.

[0102] The head portion (102) of the body (10) and the cap member (30) can be formed with corresponding sizes and shapes. Preferably, they can be formed in polygonal shapes of the same size, such as hexagons or octagons. In this case, it is preferable to configure the support rib (16) and the coupling groove (32) to be positioned at a location corresponding to the vertex of the polygonal cap member (30).

[0103] By forming a support rib (16) and a coupling groove (32) at a position corresponding to the vertex of a polygonal cap member (30), when coupling the cap member (30) to the body (10), the support rib (16) can be aligned to a position where it can be accurately coupled with the coupling groove (32) simply by aligning the vertex positions of the head part (102) and the cap member (30). This prevents misassembly due to confusion of alignment positions and significantly reduces the time required for alignment of assembly positions.

[0104] As illustrated in FIG. 7, the side air passage (p3) can be formed on the side of the second passage (p2) formed as the head portion (102) and the cap member (30) are spaced apart from each other. The height of the side air passage (p3) can be formed such that the outer height (n) is relatively higher than the inner height (m) due to the inclined surface (103). As a result, the internal air of the target object can be diffused and discharged quickly and smoothly to the outside.

[0105] FIG. 8 is an example of a usage state showing a waterproof and breathable vent installed in an ammunition storage case according to another embodiment of the present invention, and FIG. 9 is a diagram showing an air discharge path in which air is discharged from inside the ammunition storage case to the outside through a waterproof and breathable vent according to another embodiment of the present invention, and is an operation state diagram showing air introduced into the lower part of the through hole passing through a membrane sheet and being discharged to the outside.

[0106] Referring to FIGS. 8 and 9, the size of the membrane sheet (20) viewed from the top surface of the body (10) is relatively larger than the size of the through hole (104) viewed from the bottom surface of the body (10). Also, the gap between adjacent support ribs (16) (width of the side air passage, W3) is wider on the outside than on the inside, and a cap member (30, omitted in FIG. 8) covers the membrane sheet (20) and the side air passage (p3, see FIG. 7) from above at a distance.

[0107] Therefore, as shown in FIG. 9 (a), the air inside the ammunition storage case that flows in through the lower part of the through hole (104) of the body (10) and moves along the through hole (104) is diffused first and passes through the membrane sheet (20), and the air that has passed through the membrane sheet (20) is diffused secondarily in the radial direction of the body (10) as shown in FIG. 9 (b) and can be discharged quickly and smoothly to the outside without flow disturbance.

[0108] FIG. 10 is a schematic diagram of the main parts of a waterproof and breathable vent according to another embodiment of the present invention, showing an enlarged view of a membrane sheet and a seating projection portion to which the membrane sheet is joined.

[0109] Referring to FIG. 10, the membrane sheet (20) is positioned so that a portion (first region, 22) covers the upper opening (not shown) of the mounting projection (12) and is spaced apart from the through hole (104) exposed to the upper part of the body (10), and the remaining portion (second region, 24) can be firmly fixed by being joined to the side (outer surface) of the mounting projection (12) by a heat fusion method.

[0110] In some cases, along with the remaining portion (second area, 24) of the membrane sheet (20) that is joined to the side of the seating protrusion (12) by heat fusion, the portion of the membrane sheet (20) that is seated on the upper surface of the seating protrusion (12), specifically the edge portion of the first area (22), can also be joined to the upper surface of the seating protrusion (12) by heat fusion and firmly fixed.

[0111] The membrane sheet (20) includes a first region (22) and a second region (24). The first region (22) is a region that is positioned at a distance above the through hole (104) formed in the center of the body (10), with its edge resting on the seating projection (12) to cover the upper opening of the seating projection (12), and the second region (24) refers to a region formed on the outer side of the first region (22) that is positioned at a distance above the through hole (104).

[0112] In this embodiment, the second region (24) of the membrane sheet (20) can be plastically deformed in a direction perpendicular to the first region (22) through heat fusion and bonded to the side (outer surface of the seating projection) of the seating projection (12). Preferably, the second region (24) of the membrane sheet (20) can be firmly bonded to the side in a manner that wraps around part or all of the side of the seating projection (12) through heat fusion using a hollow fusion block (not shown).

[0113] If necessary, along with the second region (24) of the membrane sheet (20) that is joined to the side of the mounting projection (12) by heat fusion as previously mentioned, the edge portion of the first region (22) that is mounted on the upper surface of the mounting projection (12) can also be joined to the mounting projection (12), specifically the upper surface of the mounting projection (12) by heat fusion and firmly fixed.

[0114] To this end, the membrane sheet (20) applied in this embodiment may be formed such that the diameter (D1) of the first region (22), on which the edge portion is seated on the upper surface of the seated projection (12), is formed to be a size corresponding to the outer diameter (D2) of the seated projection (12), and the width (W1) of the second region (24), which is joined to the side of the seated projection (12) through heat fusion, is formed to be a size corresponding to the height (H) of the seated projection (12) or slightly smaller than the height (H) of the seated projection (12).

[0115] In Fig. 10 (b), the reference numeral 'c' indicates a part joined through thermal fusion.

[0116] In a waterproof and breathable vent according to such another embodiment, the membrane sheet is stably and firmly bonded to the body through heat fusion, thereby improving the durability of the waterproof and breathable vent and extending its service life.

[0117] In addition, when only the edges of the membrane sheet are heat-fused to the upper surface of the mounting protrusion, the bonding area is relatively narrow, requiring a high level of heat-fusion precision, and thus bonding defects are likely to occur. However, since the bonding area of ​​the membrane sheet in the present invention is relatively large, the difficulty of heat-fusion is low and the probability of bonding defects can be reduced.

[0118] In addition, during the process of placing the membrane on the mounting protrusion and performing heat fusion, a part of the membrane (second region) protrudes to allow for alignment error, thereby enabling stable heat fusion even if the membrane is slightly misaligned, which further enhances the stability and reliability of the heat fusion operation.

[0119] The above description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention.

[0120] Accordingly, the embodiments disclosed in this invention are intended to illustrate, not limit, the technical concept of the invention, and the scope of the technical concept of the invention is not limited by these embodiments. The scope of protection of this invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of this invention.

Claims

1. To prevent condensation in the ammunition storage case, Lower support layer; An upper reinforcing layer disposed on top of the lower support layer; and A nanofiber layer disposed between the lower support layer and the upper reinforcing layer; comprising The above nanofiber layer is a polymer material having nano-sized micropores formed through electrospinning, and is a membrane sheet for preventing condensation in an ammunition storage case.

2. In Paragraph 1, The above lower support layer is, A membrane sheet for preventing condensation in an ammunition storage case, comprising a support having a porous mesh structure made of metal or fiber material.

3. In Paragraph 2, The above lower support layer is, A membrane sheet for preventing condensation in an ammunition storage case, positioned on the upper part of the above-mentioned support member and further comprising a lower reinforcing member having a woven fabric or non-woven fabric structure.

4. In Paragraph 3, The above lower reinforcing part is, A membrane sheet for preventing condensation in an ammunition storage case, made of one or a combination of polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and nylon.

5. In Paragraph 1, The upper reinforcing layer above is, A membrane sheet for preventing condensation in an ammunition storage case, made of a woven fabric or non-woven fabric structure.

6. In Paragraph 1, The upper reinforcing layer above is, A membrane sheet for preventing condensation in an ammunition storage case, made of one or a combination of polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and nylon.

7. In Paragraph 1, The above nanofiber layer is, It includes a polymer material layer with a nanoweb structure formed through electrospinning, A membrane sheet for preventing condensation in an ammunition storage case, wherein the above-mentioned polymer material layer is formed in a multilayer structure.

8. In Paragraph 7, The above nanofiber layer is, A membrane sheet for preventing condensation in ammunition storage cases, made of one or a combination of PVDF, Nylon, PI, PBI, and TPU.

9. A waterproof and breathable vent for preventing condensation in an ammunition storage case, comprising the membrane sheet for preventing condensation in an ammunition storage case described in claim 1.

10. In Paragraph 9, The above waterproof breathable vent is, A body with a through hole formed in the center; A seating projection protruding from the upper surface of the above body; and The membrane sheet installed on the above-mentioned seating projection; comprising The above membrane sheet is, A first region in which the edge is seated on the upper surface of the above-mentioned seating projection and positioned on the upper part of the above-mentioned through hole, and A waterproof and breathable vent for preventing condensation in an ammunition storage case, comprising a second area outside the first area.

11. In Paragraph 10, The edge of the first region of the above membrane sheet is joined to the upper surface of the above seating projection through heat fusion, and A waterproof and breathable vent for preventing condensation in an ammunition storage case, wherein the second region of the above membrane sheet is joined to the side of the above seating projection through heat fusion.

12. In Paragraph 10, The diameter (D1) of the first region corresponds to the outer diameter (D2) of the seating projection, and The width (W1) of the second region corresponds to the height (H) of the seating projection, a waterproof and breathable vent for preventing condensation in an ammunition storage case.

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