Ventilated heat-shielding steel plate

Abstract

To provide a ventilation heat-shielding steel plate that is resistant to high temperatures and has little abrasion, and is used to form a ventilation layer inside the roof or outer wall of a building. [Solution] A ventilation heat-shielding steel plate 10 is used for the roof 20 or the exterior wall 20 of a building, and is used to form a ventilation layer 21 inside the roof 20 or the exterior wall 20 of a building. This ventilation heat-shielding steel plate 10 comprises a steel plate 11 and an aluminum foil veneer 12 attached to the inside of the steel plate 11, which has a flat surface and low air resistance.

Description

[Technical Field]

[0001] The present invention provides a ventilation heat-shielding steel plate that is resistant to high temperatures and has low abrasion resistance, by attaching an aluminum foil veneer to an exterior material provided on the outside of a steel plate for a roof or wall. [Background technology]

[0002] A construction method has been proposed in which a steel plate or roof has a double-layered structure in which a heat-shielding material is attached to the inside of the roofing steel plate, and a heat-shielding material is installed on the inside of the outer roofing material, allowing ventilation inside (for example, Patent Document 1).The heat-shielding material is generally made of glass fiber with high-purity aluminum foil, a material with high reflectivity against radiant heat, bonded to one or both sides by heat welding or the like in order to improve workability and construction strength, or to obtain non-combustible certification. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-45526 Summary of the Invention [Problem to be solved by the invention]

[0004] Until now, the maximum summer temperature of steel roofing materials in factories and other buildings was said to be around 80°C. Therefore, there was no problem if heat-shielding materials could withstand this temperature. Heat-shielding materials used in exterior materials (roofing, etc.) are typically composed of high-purity aluminum foil, a material with high radiant heat reflectivity, bonded to one or both sides of glass fiber by heat welding or other methods to improve workability and installation strength, or to obtain non-flammable certification. Examples of such materials include aluminum foil (a reflective material), polyethylene (a heat-sealing material), glass fiber sheet (a reinforcing material), polyethylene (a heat-sealing material), and aluminum foil (a reflective material). The problem here is that polyethylene (a heat-sealing material) has a heat resistance temperature of 70 to 90°C and a softening temperature of around 70°C. Therefore, peeling is likely to occur above 70°C. When heat-shielding materials are directly attached to roofing materials, approximately 10% of the radiant heat from the sun is reflected, but the remaining 90% is absorbed by the roofing material and transmitted to the heat-shielding material on the interior side via conductive heat. Currently, roofing materials can reach temperatures of 80°C in the summer, but if heat-shielding material is applied to the interior side, the temperature will rise by another 5°C to 85°C. Heat-shielding materials that are applied directly to the roofing material will naturally reach this temperature, and there is a possibility that they will peel off in parts. Most heat-shielding materials have the same structure and materials, and it is highly likely that they will not be able to withstand future temperature increases.

[0005] There is also a ventilation method in which roofs and walls are double-layered, with heat-shielding material installed on the indoor side of the outer exterior material, and ventilation is provided on the inside of that. The ventilation structure constructed using this ventilation method has a ventilation layer on the indoor side of the heat-shielding material, allowing outside air to flow, but the important thing here is the unevenness of the heat-shielding surface. The unevenness of the heat-shielding surface is the biggest problem for ventilation methods (ventilation structures), not only does it increase air wear due to ventilation, but it also comes into contact with fine particles such as dust from outside, which can cause surface damage to the soft aluminum foil. As mentioned above, the heat-shielding materials currently in use have a fiber base material and the aluminum foil is thin, so they have a lot of unevenness on the surface.

[0006] Therefore, an object of the present invention is to provide a ventilation heat shield steel plate that is used to form a ventilation layer inside the roof or exterior wall of a building, and that is resistant to high temperatures and has low abrasion resistance. [Means for solving the problem]

[0007] The ventilation heat-shielding steel plate of the present invention is used for the roof or outer wall of a building and is used to form a ventilation layer inside the roof or outer wall of a building, and is characterized by comprising a steel plate and an aluminum foil veneer attached to the inside of the steel plate, which has a flat surface and low air resistance.

[0008] The ventilation heat shield steel plate according to the present invention is characterized in that a highly permeable resin layer that allows good transmission of radiant heat is provided on one or both sides of an aluminum foil veneer.

[0009] The ventilation heat-shielding steel plate of the present invention is constructed by sequentially laminating from the outside of the roof or exterior wall of a building a steel plate, a first highly permeable resin layer that transmits radiant heat well, an aluminum foil veneer, and a second highly permeable resin layer that transmits radiant heat well, and is characterized in that a plurality of adhesive layers are provided between the steel plate and the first highly permeable resin layer to partially bond the steel plate and the first highly permeable resin layer. [Effects of the Invention]

[0010] The ventilation heat shielding steel plate according to the present invention uses an aluminum foil veneer with a flat surface and low air resistance. This allows air to flow smoothly through the air permeable layer formed between the ventilation heat shielding steel plate and an exterior component (wall material or roof material), reducing wear between the aluminum foil veneer and the air, allowing the aluminum foil veneer to be used for a long period of time without deteriorating in function. Furthermore, the ventilation heat shielding steel plate according to the present invention uses an acrylic adhesive to directly attach the aluminum foil veneer to the steel plate, preventing the aluminum foil veneer from peeling off from the steel plate even when the temperature of the ventilation heat shielding steel plate reaches 80°C or higher in the summer.

[0011] The heat-shielding steel plate for ventilation according to the present invention significantly reduces processing costs by reducing the amount of material constituting the heat shield, which also reduces the price of the heat-shielding steel plate for ventilation and makes it possible to use it in a wide range of fields. Furthermore, the development of a method for partially bonding aluminum foil veneers to the steel plate makes continuous production possible through mechanical use, further improving productivity and reducing costs. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a diagram for explaining the flow of fluid (air) inside a pipe. [Figure 2] FIG. 10 is a diagram illustrating the movement of air through the ventilation layer when a double-layered structure is formed on the roof. [Figure 3] 10 is a diagram illustrating the movement of air flowing through a ventilation layer when a double structure is formed on the wall and the inner wall, etc., has unevenness. FIG. [Figure 4] 1A and 1B are cross-sectional views of a heat-shielding steel plate for ventilation according to an embodiment of the present invention, where (a) is a heat-shielding steel plate for ventilation formed into an uneven shape, and (b) is a heat-shielding steel plate for ventilation formed into a flat plate shape. [Figure 5] 1 is a diagram showing a ventilation heat shield steel plate according to an embodiment of the present invention attached to an exterior member. [Figure 6] FIG. 1 is a diagram showing an example in which an aluminum foil veneer or the like is attached to a steel plate by partial adhesion in a ventilation heat shield steel plate according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The climate is rapidly changing from an era of global warming to an era of global boiling. In 2017, the temperature in Kumagaya City, Japan, reached 41.4°C, and in Disney Valley, California, it reached a staggering 54.4°C. As a result, we are seeing a rapid increase in events that cannot be ignored using conventional common sense.

[0014] It is known that heat insulation on the interior side of exterior materials is effective against heat from outside, but it only serves to insulate against heat generated from inside the room, significantly reducing the heat insulation effect. Therefore, a new technology is available, in which the exterior materials are made into a double structure, with heat insulation material placed between them, and a ventilation layer placed on the inside. This new method makes use of the low radiation properties of heat insulation materials, and by constantly discharging the small amount of heat generated by radiation to the outside, it is possible to obtain highly efficient and stable heat insulation performance. In order to increase the durability of this method, it is important to take measures against wear between the heat insulation material and the air.

[0015] These issues can be broadly divided into four categories. The first is wear on the heat-shielding material caused by the air flowing through the double-layered ventilation layer. Heat-shielding materials have traditionally been used in static air conditions, and therefore have never been used within ventilation layers. However, ventilation construction methods offer an overwhelmingly superior heat-shielding effect for buildings, and this method will undoubtedly become more common. Heat-shielding materials are constructed with a multi-layer structure for installation and strength reasons, but surface irregularities are unavoidable due to the base material. For example, when glass fiber is used, its high rigidity, and aluminum foil is thin, so when the two are heat-welded, the shape of the fiber is inevitably visible on the surface. Furthermore, when a thin resin sheet is used as the base material, resin shrinkage and other factors can easily cause irregularities on the surface of the heat-shielding material.

[0016] The best mode for carrying out the present invention will be described below with reference to FIGS. 1 to 6. FIG.

[0017] As shown in Figure 1, when considering a fluid flowing inside (ventilation layer) 102 of a cylindrical pipe 100, generally, if the flow velocity of the fluid (air) F flowing in the ventilation layer is laminar, it is fast in the center of the ventilation layer and zero on the side of the inner wall surface 101. Therefore, it is thought that there is almost no wear between the inner wall surface 101 and the air F.

[0018] When a ventilation layer 5 is formed on a roof between an exterior component 2 with a heat-shielding material 4 on the inside and an interior component 3 facing the exterior component 2, as shown in Figure 2, high-temperature heat flows upward due to buoyancy due to the slope, creating friction between the heat-shielding material 4 and the air F, resulting in wear of the heat-shielding material 4. When a ventilation layer 5 is formed on a wall between an exterior component 2 with a heat-shielding material 4 on the inside and an interior component 3 facing the exterior component 2, as shown in Figure 3, the ventilation layer 5 is formed in the vertical direction Y. Turbulence is generated not only by mounting components such as furring strips but also by unevenness 6 on the surface of the heat-shielding material 4 and the interior component 3, increasing the risk of wear of the heat-shielding material 4. Because laminar flow of fluid F minimizes friction with the wall surface, it is important to minimize the unevenness 6 on the surfaces of the components that make up the ventilation layer 5.

[0019] Second, most of the heat-shielding materials currently in use have a usable range of roughly -30°C to 80°C, and it is predicted that roof temperatures will exceed 85°C in the future, making it difficult to use current heat-shielding materials. General heat-shielding materials use reinforcing materials to increase the strength of the reflective aluminum foil. While the reinforcing material itself is generally heat-resistant and presents no problems, it is desirable to consider changing the heat-welding material used to bond the aluminum foil to the reinforcing material.

[0020] Third, if air is taken into the ventilation layer, fine particles such as yellow sand, dust, and dirt will collide with the soft surface of the heat shield, causing scratches and wear, which could reduce the performance of the heat shield or even destroy it in some cases.The aluminum foil currently used in heat shields is 5 to 10 μm thick, and there are concerns that it can be easily damaged.

[0021] Fourth, when a ventilation layer is installed, acidic and alkaline substances from the outside world constantly penetrate into the ventilation layer. Aluminum foil is vulnerable to both acids and alkalis, and contact with these substances can cause corrosion. Therefore, it is necessary to protect the heat shield from these materials.

[0022] A ventilation heat shielding steel plate 10 according to the present invention is used for the roof or outer wall of a building and is used to form a ventilation layer 21 on the inside of the roof or outer wall of a building. As shown in FIG. 4 , this ventilation heat shielding steel plate 10 comprises a steel plate 11 and an aluminum foil veneer 12 attached to the inside of the steel plate 11, which has a flat surface and low air resistance. This aluminum foil veneer 12 is bonded to the steel plate 11 via an adhesive layer 14. In the ventilation heat shielding steel plate 10, one aluminum foil veneer 12 is bonded to the steel plate 11. Note that an acrylic adhesive is used for the adhesive layer 14, for example. Alternatively, the ventilation heat shielding steel plate 10 may be composed only of the steel plate 11 and the aluminum foil veneer 12 bonded to the inside of the steel plate 11.

[0023] The ventilation heat-shielding steel plate 10 of the present invention comprises an aluminum foil veneer 12 directly attached to a steel plate 11 used for roofs, walls, etc. via an adhesive layer 14. Since the aluminum foil veneer 12 is directly attached to the steel plate 11, the strength of the aluminum foil veneer 12 is not necessary; rather, low air resistance and high radiant heat reflectance are important. The present invention focuses on this point and makes it possible to utilize the maximum performance of the aluminum foil veneer 12. When the aluminum foil veneer 12 is rolled, one side has a rough, matte finish due to the process, while the other side has a shiny, smooth surface. The aluminum foil veneer 12 produced by rolling is an aluminum plate material.

[0024] The ventilation heat shielding steel plate 10 of the present invention is attached to the outside of an exterior member (roofing material) 20 as shown in Figure 5(a) or to the outside of an exterior member (wall material) 20 as shown in Figure 5(b). A ventilation layer 21 is formed between the ventilation heat shielding steel plate 10 and the exterior member 20. In this way, a double roof structure or a double wall structure is formed by the ventilation heat shielding steel plate 10 and the exterior member 20. In the ventilation heat shielding steel plate 10 of the present invention, the shiny side is used on the ventilation layer 21 side, although this is a minor point, in pursuit of surface smoothness. In terms of heat resistance, since it is made of aluminum foil, it goes without saying that it can withstand high temperatures.

[0025] Heat-shielding materials are commonly used to reflect radiant heat. Heat-shielding materials require a certain level of strength when installed between walls and exterior walls or in ceiling spaces. All heat-shielding materials are sandwiched between aluminum foil and nonwoven fabric, glass cloth, or resin mats to increase their strength, creating a composite structure. For example, non-combustible heat-shielding materials used in roofing and other applications consist of five layers: aluminum foil, which reflects radiant heat; heat-sealing material; glass cloth, a reinforcing material for increased strength; heat-sealing material; and aluminum foil, which also reflects radiant heat. The aluminum foil used in heat-shielding materials is typically very thin, between 5 and 10 μm. When these materials are heat-sealed, the unevenness of the glass cloth fibers becomes clearly visible on the surface. This unevenness is a major factor in air abrasion within the ventilation layer.

[0026] On the other hand, in the present invention, smooth aluminum foil veneer 12 made by rolling an aluminum ingot is used, so that no irregularities are formed on the surface of aluminum foil veneer 12, and there is no need to worry about air abrasion in ventilation layer 21.

[0027] As mentioned above, heat-shielding materials are composite materials, and the most important thing to be careful of is the heat-sealing material. Because heat-sealing materials are welded together, they have a lower melting point and softening temperature than aluminum foil or glass cloth, a reinforcing material that increases strength. Most commonly, they are made of polyethylene and soften at around 70°C. The operating range for heat-shielding materials is generally around -30°C to +80°C. Therefore, considering that the upper limit is 80°C, this is undoubtedly an extremely tight temperature range. In the future, roof temperatures may rise to 85-90°C, making it extremely difficult to apply heat-shielding materials directly.

[0028] The ventilation heat shield steel plate 10 according to the present invention uses the aluminum foil veneer 12 and further uses an acrylic adhesive to bond it to the steel plate, thereby solving the above problem.

[0029] The aluminum foil veneer 12 used in the present invention is preferably 30 μm to 80 μm thick, which is much thicker than the aluminum foil (5 μm to 10 μm) used in heat shielding materials. This thickness allows it to withstand long-term damage even if the surface is slightly scratched. Of course, thicker foils are also acceptable, but this comes with problems such as increased weight and cost.

[0030] Furthermore, the ventilation heat shield steel plate 10 according to the present invention can be provided with a highly permeable resin layer 13 that allows good transmission of radiant heat on one or both sides of the aluminum foil veneer 12 (FIG. 4).

[0031] Highly permeable resin layer 13, which transmits radiant heat well, is a thin resin film approximately 5 μm thick. This thin film prevents electrolytic corrosion when used between steel sheet 11 and aluminum foil veneer 12, and also protects aluminum foil veneer 12 from acidic and alkaline substances in the air when used on the ventilation layer 21 side.

[0032] In the heat-shielding steel plate 10 for ventilation according to the present invention, when the steel plate 11 and the aluminum foil veneer 12 are bonded by a method such as full-surface gluing, the glue itself serves to prevent electrolytic corrosion, and so the structure is used as is. When producing the heat-shielding steel plate 10 for ventilation, there are two methods, depending on the production volume: applying the aluminum foil veneer 12 by hand or by machine, but in either case there is no problem with performance, and the plate is produced by a method that is easy to produce.

[0033] The ventilation heat-shielding steel plate 10 is used in double roof structures or double wall structures where air flows inside, so the inside of the ventilation heat-shielding steel plate 10 is in contact with constantly flowing air. Because air contains salt and alkaline components, a surface treatment that can deal with this is required. This can be achieved by using the aforementioned highly permeable resin layer 13, which has good permeability to radiant heat.

[0034] As shown in Figure 6, the ventilation heat-shielding steel plate 10 of the present invention is constructed by sequentially laminating from the outside of the roof or exterior wall of a building a steel plate 11, a first highly permeable resin layer 15 that transmits radiant heat well, an aluminum foil veneer 12, and a second highly permeable resin layer 13 that transmits radiant heat well, and between the steel plate 11 and the first highly permeable resin layer 15, a plurality of adhesive layers 14 are provided that partially bond the steel plate 11 and the first highly permeable resin layer 15 together.

[0035] When steel sheets for exterior applications such as roofs and exterior walls are automatically bonded to heat-shielding materials on a production line, air can get trapped and cause bubbles. A common method is to drill holes in the heat-shielding material to remove the bubbles, but these holes can then become a cause of air abrasion.

[0036] To solve this problem, a highly permeable resin layer 15 that transmits radiant heat well is provided on the steel plate 11 side of the aluminum foil veneer 12, and adhesive is applied only partially to create an air layer between the steel plate 11 and the aluminum foil veneer 12. As a result, problems such as blistering due to air are eliminated while preventing electrolytic corrosion between the steel plate 11 and the aluminum foil veneer 12. Since the present invention utilizes low radiation performance, there is no problem of such issues on the reflective side reducing performance on the radiant side. In this case, the ventilation heat-shielding steel plate 10 has a five-layer structure consisting of the steel plate 11, a partially formed adhesive layer (partial adhesive layer) 14, a highly transparent resin layer 15 that transmits radiant heat well, the aluminum foil veneer 12, and a highly transparent resin layer 13 that transmits radiant heat well.

[0037] In the present invention, aluminum foil veneer 12 has a purity of 99.5% and a reflectivity of 98% or higher. However, due to the surface treatment described above, the final reflectivity is approximately 95%. Generally, heat shielding materials have aluminum foil thicknesses of 5 μm to 7 μm, and the overall thickness, including the base material, is 0.2 mm to 0.3 mm. However, since aluminum foil 12 is used in the present invention, the overall thickness is approximately 30 μm to 80 μm.

[0038] The history of using heat shielding materials around the world goes back over a hundred years, but it was originally thought that heat shielding materials were materials that reflected radiant heat and required a reflective space. To create this reflective space, the heat shielding materials needed to be fixed to components such as furring strips that held the materials in place, and strength was also important, so heat shielding materials were not used as thin aluminum foil alone, but as composites combined with other base materials.

[0039] A method of blocking radiant heat by applying heat-shielding material to exterior steel sheets for roofs, exterior walls, etc. was developed quite recently, around 2013. The reason why such an excellent technology was not adopted is because it was based on the idea that the majority of heat transfer is conductive heat, and the surface temperature was measured by sandwiching thermocouples on both sides of the test specimen, i.e., by measuring conductive heat. In other words, no matter how reflective the material, if you sandwich it and measure the temperature, the temperature difference between the two sides will hardly change, so it was judged that this method would be ineffective. The reality is that it was not generally understood that radiant heat cannot be measured using a contact method.

[0040] In recent years, the use of heat-shielding materials on exterior roof and wall materials has become increasingly common. The problem here is rising temperatures. As global warming progresses, temperatures are rising year by year, and the temperature of exterior materials, which has previously been said to be around 80°C, is on an even higher trend. Furthermore, if the material is applied to the inside (indoor) side of the exterior material, which is the radiating side, the temperature of the exterior material will rise by at least 5 to 8°C. Therefore, taking these factors into consideration, it becomes difficult to use heat-shielding materials unless they can withstand a temperature of at least close to 90°C.

[0041] Many current heat shielding materials are made up of a reflective aluminum foil, a heat-sealable polyethylene, a reinforcing material such as glass fiber or polyester sheet, another heat-sealable polyethylene, and another reflective aluminum foil. While the reflective and reinforcing materials are sufficiently heat-resistant, the heat-sealable polyethylene softens at around 70°C, raising concerns that the heat shielding material itself may peel off. Since radiant heat is reflected by the surface of the aluminum foil, it can be thin and there is no need to make it into a composite. Therefore, to solve these problems, aluminum foil alone can be used as a substitute for heat shielding material, and an acrylic adhesive can be used to adhere it. This will eliminate all heat-related problems.

[0042] Recently, a new ventilation method has emerged in which exterior materials such as roofs and walls are double-layered, with a reflective material inserted between them and the radiating side. Heat-shielding materials have traditionally been used in static spaces, never with ventilation. However, this method presents new problems. First, laminar airflow is desirable for the air flowing between the exterior and heat-shielding materials. However, in reality, there is a temperature difference between the exterior and heat-shielding materials. Heat moves perpendicular to the flow, following the principle of heat transfer from high to low temperatures. On roofs, the slope causes hot air to rise due to buoyancy and move along the upper wall. Furthermore, on walls, various factors, such as the presence of obstacles within the ventilation layer, such as girders and tight frames, can create turbulent airflow. This increases friction between the heat-shielding material and the air, potentially increasing wear on the heat-shielding material. While increasing the hardness of the aluminum foil itself would alleviate this problem, purity is crucial for improving aluminum foil performance. Increasing purity reduces hardness, creating contradictory properties that make this method ineffective.

[0043] Therefore, to minimize friction, it is important to make the surface of the heat-shielding material smooth. However, heat-shielding materials used in roofing materials must be non-flammable, and so glass fiber sheets are used as reinforcing materials. Glass fiber sheets are made by layering rigid glass fibers, which creates an uneven surface. To create a heat-shielding material, they are heat-welded, but when heat is applied, the thin aluminum foil on the surface softens and adheres to the glass fiber side, resulting in an uneven surface on the heat-shielding material that is difficult to make flat. On the other hand, aluminum foil is made by rolling aluminum ingots into a thin film, and its surface is smooth. Therefore, using aluminum foil alone is also effective here.

[0044] Second, the air flowing through the ventilation layer contains dust and dirt. These substances come into contact with the soft aluminum foil, causing scratches and abrasion that can damage the surface, potentially reducing or destroying its heat-shielding performance. Dust can be removed by attaching a dust filter to the air intake, but doing so for the entire building would be extremely costly and would significantly increase maintenance costs. Another way to reduce this abrasion is to increase the surface hardness of the aluminum foil, but as mentioned above, it is impossible to make aluminum foil that is that hard. Furthermore, although aluminum foil is said to be highly durable due to the formation of an oxide film, this only applies in still air conditions, and it is extremely difficult for it to withstand the impact of dust and other particles over long periods of time.

[0045] Therefore, in the heat shielding steel plate 10 for ventilation according to the present invention, the use of aluminum foil veneers 12 reduces surface snagging and addresses this problem. Also, while the thickness of typical heat shielding materials is approximately 5 μm to 10 μm, the aluminum foil veneers 12 used in the present invention are 30 μm to 80 μm thick. Of course, thicker aluminum foil veneers 12 may be used, but the thickness should be determined by taking into account factors such as weight and price.

[0046] Third, using the atmosphere can potentially introduce acidic or alkaline components. For example, it is well known that alkaline components are high near the sea. This is called corrosion wear, and to address this, a resin layer 13 that allows good transmission of radiant heat is provided on the surface of the aluminum foil veneer 12. The thickness of this resin layer 13 is generally within 5 μm; if it is made thicker, the heat-shielding performance will decrease.

[0047] In this way, as a method of withstanding future temperature rises and in order to ensure that ventilation methods using the atmosphere can be used for a long period of time without any problems, the ventilation heat shield steel plate 10, which has an aluminum foil veneer 12 attached to a steel plate 11, has a simple structure, but is a very important and revolutionary product.

[0048] [Test 1] Test specimen (1) had a heat shielding material (THB-FX) attached to one side of a 0.6mm thick, 20cm wide, and 25cm high steel plate, and test specimen (2) had a 30μm aluminum foil veneer attached to one side. They were set 30cm in front of a 1kW far-infrared heater, with the aluminum foil veneer attached side facing away from the heater. The temperature of the aluminum foil veneer side at this time was measured using a thermograph. The room temperature was 25°C. Test piece (1): THB-FX (matt surface) 0.2 mm Specimen (2): Aluminum foil veneer (shiny surface) 30 μm

[0049] [Result 1] Test piece (1): Temperature 35.3℃ Test piece (2): Temperature 34.7℃

[0050] [Consideration 1] Thermography temperature measurements show that the aluminum foil single plate, test piece (2), performs better, although only by 0.6°C.

[0051] Next, the effects of the ventilation heat shield steel plate 10 according to the present invention will be described.

[0052] The ventilation heat shield steel plate 10 according to the present invention uses aluminum foil veneers 12 with a flat surface and low air resistance. This allows air to flow smoothly through the ventilation layer 21 formed between the ventilation heat shield steel plate 10 and the exterior member (wall material or roof material) 20, reducing wear between the aluminum foil veneer 12 and the air. This allows the aluminum foil veneer 12 to be used for a long period of time without its functionality being impaired.

[0053] In the ventilation heat shielding steel plate 10 according to the present invention, the aluminum foil veneer 12 is directly attached to the steel plate 11 using an acrylic adhesive. Therefore, even if the temperature of the ventilation heat shielding steel plate 10 reaches 80°C or higher in the summer, the aluminum foil veneer 12 can be prevented from peeling off from the steel plate 11. Therefore, by using this ventilation heat shielding steel plate 10, the heat shielding performance can be stably maintained.

[0054] The ventilation heat shield steel plate 10 of the present invention uses aluminum foil veneers 12 instead of the conventional heat shield material, reducing the amount of material used in the conventional heat shield material. This significantly reduces processing costs, which in turn reduces the product price of the ventilation heat shield steel plate 10, allowing it to be used in a wide range of fields.

[0055] Furthermore, by developing a method for partially bonding aluminum foil veneers 12 to steel plates 11, as in the case of the heat-shielding steel plates 10 of the present invention, continuous production by mechanical use becomes possible, further improving productivity and reducing costs.

[0056] The heat-shielding steel plate 10 for ventilation according to the present invention has an aluminum foil veneer 12 applied to the inside of the steel plate 11, but since glass is often used in high-rise buildings, it can also be used on the inside of the glass in that case.

[0057] Although the present embodiment has been described above, it is possible to select and / or change the configurations given in the above embodiment to other configurations as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0058] 2 Outer cladding material 3. Inner exterior material 4 Heat shield material 5. Ventilation layer 6 Unevenness 10. Heat-shielding steel plate for ventilation 11 Steel plate 12 Aluminum foil veneer 13 Highly transparent resin layer (second highly transparent resin layer) 14 Adhesive layer 15 Highly transparent resin layer (first highly transparent resin layer) 20 Exterior materials (roofing materials, exterior wall materials) 21 Ventilation layer 100 tubes 101 Inner wall surface 102 Interior (ventilation layer) F fluid (air) X Anteroposterior direction Y Up / down direction (vertical direction)

Claims

[Claim 1] A ventilation heat-shielding steel plate used for the roof or the outer wall of a building to form a ventilation layer inside the roof or the outer wall of the building, A steel plate and an aluminum foil veneer attached to the inside of the steel plate, the aluminum foil veneer having a flat surface and low air resistance, The steel plate, a first highly permeable resin layer that transmits radiant heat well, the aluminum foil single sheet, and a second highly permeable resin layer that transmits radiant heat well are laminated in this order from the outside of the roof of the building or the exterior wall of the building, A plurality of adhesive layers are provided between the steel plate and the first highly permeable resin layer to partially bond the steel plate and the first highly permeable resin layer. A heat-shielding steel plate for ventilation characterized by:

Images