JP7721189B1 - Ventilated heat-shielding steel plate - Google Patents

Abstract

The present invention provides a ventilation heat shield steel plate that is resistant to high temperatures and has low abrasion resistance, and is used to form a ventilation layer inside the roof or exterior 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 the 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.
[Selected figure] Figure 5

Description

This 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 the exterior material installed on the outside of steel plates for roofs and walls.

A construction method has been proposed in which a double-layered structure is created by attaching a heat-shielding material to the inside of the steel roofing sheets, and then installing the heat-shielding material on the inside of the outer roofing material, allowing ventilation inside (for example, Patent Document 1). Heat-shielding materials are generally made by bonding high-purity aluminum foil, a material with high reflectivity against radiant heat, to one or both sides of glass fiber by heat welding or other methods in order to improve workability and construction strength, or to obtain non-combustible certification.

Japanese Patent Application Laid-Open No. 2022-45526

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 the heat-shielding material could withstand this temperature. Heat-shielding materials used in exterior materials (roofing, etc.) are generally 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 construction 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. In other words, 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 attached to the interior side, the temperature will rise by another 5°C to 85°C. Heat-shielding material that is attached directly to the roofing material will naturally reach this temperature, and there is a risk of it peeling 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.

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 cladding, allowing ventilation inside. The ventilation structure constructed using this ventilation method places an air-permeable layer on the indoor side of the heat-shielding material, allowing outside air to flow through, 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 (ventilated structures), not only does it increase air abrasion 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, due to the thin aluminum foil, have a lot of unevenness on the surface.

The present invention aims to provide a ventilation heat-shielding steel plate that is resistant to high temperatures and has low abrasion resistance, and is used to form a ventilation layer inside the roof or exterior wall of a building.

The ventilation heat-shielding steel plate of the present invention is used for the roof or exterior wall of a building and is used to form a ventilation layer inside the roof or exterior wall of a building. It 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.

The ventilation heat-shielding steel plate of the present invention is characterized by having a highly permeable resin layer that allows radiant heat to pass through easily on one or both sides of the aluminum foil veneer.

The ventilation heat-shielding steel plate of the present invention is constructed by sequentially laminating, from the outside of a building roof or exterior wall, 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 by the provision of multiple adhesive layers between the steel plate and the first highly permeable resin layer that partially bond the steel plate and the first highly permeable resin layer.

The ventilation heat shield steel plate of the present invention uses an aluminum foil veneer with a flat surface and low air resistance. This allows air to flow smoothly through the ventilation layer formed between the ventilation heat shield steel plate and the 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 compromising its functionality. Furthermore, because the ventilation heat shield steel plate of the present invention uses an acrylic adhesive to directly attach the aluminum foil veneer to the steel plate, peeling off of the aluminum foil veneer from the steel plate can be prevented even when the ventilation heat shield steel plate reaches temperatures of 80°C or higher in the summer.

The ventilation heat-shielding steel plate of the present invention significantly reduces processing costs by reducing the amount of material used to make up the heat shield, thereby reducing the price of the ventilation heat-shielding steel plate and enabling it to be used in a wide range of fields. Furthermore, the development of a method for partially bonding aluminum foil veneers to steel plates makes continuous production possible through mechanical use, further improving productivity and reducing costs.

FIG. 10 is a diagram for explaining the flow of fluid (air) inside a pipe. FIG. 10 is a diagram illustrating the movement of air through the ventilation layer when a double-layered structure is formed on the roof. 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. 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. 1 is a diagram showing a ventilation heat shield steel plate according to an embodiment of the present invention attached to an exterior member. 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.

The climate is rapidly changing from an era of global warming to an era of global boiling. In Japan, the city of Kumagaya recorded a temperature of 41.4°C in 2017, while in Disneyland, California, it reached a staggering 54.4°C. Therefore, we are seeing a rapid increase in events that cannot be ignored using conventional common sense.

It is known that while heat insulation on the interior side of exterior materials is effective against heat from outside, it only serves to insulate against heat generated from inside the room, significantly reducing the heat-shielding effect. Therefore, a new technology is the ventilation method, which uses a double-layered exterior material, places a heat-shielding material between the layers, and then places a ventilation layer on the inside. This new method takes advantage of the low radiation properties of heat-shielding materials, and by constantly discharging the small amount of heat generated by radiation to the outside, it is possible to achieve highly efficient and stable heat-shielding performance. To increase the durability of this method, it is important to take measures to prevent wear between the heat-shielding material and the air.

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. Until now, heat-shielding materials have been used primarily when the air is still, and therefore have never been used within a ventilation layer. However, ventilation methods offer an overwhelmingly superior heat-shielding effect for buildings, and it is certain that ventilation methods will become more common. Heat-shielding materials have a multi-layered structure for installation and strength reasons, but due to the base material, it is inevitable that unevenness will form on the surface. For example, when glass fiber is used, it is highly rigid, and aluminum foil is thin, so when the two are heat-welded, the shape of the fiber will inevitably become visible on the surface. Furthermore, when a thin resin sheet is used as the base material, unevenness is likely to occur on the surface of the heat-shielding material due to factors such as resin shrinkage.

The best mode for implementing the present invention will be described below with reference to Figures 1 to 6.

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

When a ventilation layer 5 is formed on a roof between an exterior member 2 with heat-shielding material 4 on the inside and an interior member 3 facing the exterior member 2, as shown in Figure 2, high-temperature heat flows in a manner that exerts pressure on the upper part of the ventilation layer 5 due to buoyancy due to the slope, generating friction between the heat-shielding material 4 and the air F, resulting in wear of the heat-shielding material 4. Furthermore, when a ventilation layer 5 is formed on a wall between an exterior member 2 with heat-shielding material 4 on the inside and an interior member 3 facing the exterior member 2, as shown in Figure 3, the ventilation layer 5 is formed in the up-down direction Y (vertical direction). 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 member 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.

Secondly, most heat-shielding materials currently in use have a usable range of roughly -30°C to 80°C. Roof temperatures are expected to 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 advisable to consider changing the heat-welding material used to bond the aluminum foil to the reinforcing material.

Thirdly, 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 easily break.

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.

The ventilation heat shielding steel plate 10 according to the present invention is used for the roof or exterior wall of a building, and is used to form a ventilation layer 21 on the inside of the roof or exterior 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. The ventilation heat shielding steel plate 10 can also be composed of only the steel plate 11 and the aluminum foil veneer 12 bonded to the inside of the steel plate 11.

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. Because the aluminum foil veneer 12 is attached directly to the steel plate 11, the strength of the aluminum foil veneer 12 is not necessary; rather, low air resistance and smoothness with 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.

The ventilation heat shield 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 shield steel plate 10 and the exterior member 20. In this way, a double roof structure or double wall structure is formed by the ventilation heat shield steel plate 10 and the exterior member 20. In order to achieve a smooth surface, the ventilation heat shield steel plate 10 of the present invention uses the shiny side on the ventilation layer 21 side, although this is a minor point. In terms of heat resistance, since it is made of aluminum foil, it can naturally withstand high temperatures.

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, and all heat-shielding materials are used as a composite to increase strength by sandwiching nonwoven fabric, glass cloth, or resin mats on one side or between aluminum foil. 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 that increases strength; heat-sealing material; and aluminum foil, which reflects radiant heat. The aluminum foil used in heat-shielding materials is very thin, typically 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 wear within the ventilation layer.

In contrast, the present invention uses a smooth aluminum foil veneer 12 made by rolling an aluminum ingot, so there are no irregularities on the surface of the aluminum foil veneer 12, and there is no need to worry about air abrasion in the ventilation layer 21.

As mentioned above, heat-shielding materials are composite materials, and the one that requires the most attention 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 from polyethylene or similar materials, 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 reach as high as 85-90°C, making it extremely difficult to apply heat-shielding materials directly.

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

The aluminum foil veneer 12 used in this invention is preferably 30 μm to 80 μm thick, which is much thicker than the aluminum foil used in heat shields (5 μm to 10 μm). This thickness allows it to withstand slight surface scratches for a long period of time. Of course, thicker foils are no problem, but they would be heavier and more expensive.

In addition, the ventilation heat-shielding steel plate 10 according to the present invention can also 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 (Figure 4).

The highly permeable resin layer 13, which allows for good transmission of radiant heat, is a thin resin film approximately 5 μm thick. When used between the steel plate 11 and the aluminum foil veneer 12, this thin film serves to prevent electrolytic corrosion. When used on the ventilation layer 21 side, it can also protect the aluminum foil veneer 12 from acidic and alkaline substances in the air.

In the ventilation heat shield steel plate 10 of the present invention, if the steel plate 11 and aluminum foil veneer 12 are bonded together by full-surface gluing or other methods, the glue itself serves to prevent electrolytic corrosion, and the structure can be used as is. When producing the ventilation heat shield steel plate 10, there are two methods, depending on the production volume: applying the aluminum foil veneer 12 by hand or by machine. In either case, there are no performance issues, and the plate can be manufactured using the method that is easiest to produce.

Because the ventilation heat-shielding steel plate 10 is used in double roof or double wall structures where air flows inside, the inside of the ventilation heat-shielding steel plate 10 is in constant contact with flowing air. Because air contains salt and alkaline components, a surface treatment that can deal with this is necessary. This can be achieved with the aforementioned highly permeable resin layer 13, which allows for good transmission of radiant heat.

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 a building roof or exterior wall 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. Between the steel plate 11 and the first highly permeable resin layer 15, multiple adhesive layers 14 are provided to partially bond the steel plate 11 and the first highly permeable resin layer 15 together.

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 become trapped, creating 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.

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 an adhesive is applied 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.

In the present invention, aluminum foil veneer 12 is made with 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 to 7 μm, and the overall thickness, including the base material, is 0.2 to 0.3 mm. However, since the present invention uses aluminum foil 12 alone, the thickness is approximately 30 to 80 μm.

The use of heat shielding materials around the world dates back over a hundred years, but originally, heat shielding materials were thought to be materials that reflect radiant heat, and required a reflective space. To create this reflective space, the heat shielding material needs to be fixed to components such as furring strips that hold it in place, and strength is also important, so heat shielding materials have been used not as thin aluminum foil alone, but as composites combined with other substrates.

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 the material and measure the temperature, the temperature difference between the two sides will hardly change, so it was judged that this would be ineffective. The reality is that it was not generally understood that radiant heat cannot be measured using the contact method.

In recent years, the use of heat-shielding materials on exterior roof and wall exteriors 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 heat-shielding materials are applied to the inside (indoor) side of the exterior, which is the radiating side, the temperature of the exterior material will rise by at least 5°C to 8°C. Therefore, taking these factors into consideration, heat-shielding materials must be able to withstand a temperature close to 90°C or higher in order to be useful.

Most 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 can withstand sufficient heat temperatures, the heat-sealable polyethylene softens at around 70°C, raising concerns that the heat shielding material itself may peel off. Because 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 issues.

Recently, a new construction method has emerged in which exterior materials such as roofs and walls are double-layered, with reflective material inserted between them and ventilation on the radiating side. Until now, heat-shielding materials have typically 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, and heat moves perpendicular to the flow, in accordance with 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, create turbulent airflow. This increases friction between the heat-shielding material and the air, potentially increasing wear on the heat-shielding material. Increasing the hardness of the aluminum foil itself would alleviate this problem, but purity is important for improving aluminum foil performance. Increasing purity reduces hardness, resulting in opposing properties, making this method unsuitable.

Therefore, to reduce friction even as much as possible, 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 gives them an uneven surface. To make this into a heat-shielding material, it is 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.

The second issue is that the air flowing through the ventilation layer contains dust and dirt. These substances come into contact with the soft aluminum foil and cause wear and tear, damaging the surface, which can reduce or even destroy its heat-blocking performance. Dust can be removed by attaching a dust filter to the air intake, but doing so for the entire building is an extremely large-scale undertaking, resulting in significantly increased maintenance costs. One way to reduce this wear 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, aluminum foil is said to be highly durable due to the oxide film it forms, but this is only true in still air, and it is extremely difficult to withstand the impact of dust and other particles over an extended period of time.

The ventilation heat shield steel plate 10 of the present invention addresses this issue by using an aluminum foil veneer 12, which reduces surface snags. Furthermore, while typical heat shielding materials are approximately 5 μm to 10 μm thick, the aluminum foil veneer 12 used in the present invention is 30 μm to 80 μm thick. Of course, a thicker aluminum foil veneer 12 can be used, but the thickness should be determined by balancing factors such as weight and price.

Thirdly, using the atmosphere can potentially introduce acidic or alkaline components. For example, it is well known that alkaline components are higher near the sea. This is called corrosion wear, and to address this, a resin layer 13 that allows radiant heat to pass through well 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, its heat-shielding performance will decrease.

As a way to withstand future temperature rises and to ensure that atmospheric ventilation methods can be used for a long period of time without hindrance, the ventilation heat-shielding steel plate 10, which has a steel plate 11 and an aluminum foil veneer 12 attached to it, has a simple structure, but is an extremely important and groundbreaking product.

[Test 1]
Test specimen (1) had a heat shielding material (THB-FX) attached to one side of a steel plate 0.6 mm thick, 20 cm wide, and 25 cm high, and test specimen (2) had an aluminum foil veneer (30 μm) attached to one side. They were set 30 cm in front of a 1 kW 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
Test piece (2): Aluminum foil single plate (shiny surface) 30 μm

[Result 1]
Test piece (1): Temperature 35.3°C
Test piece (2): Temperature 34.7°C

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

Next, we will explain the effects of the ventilation heat shield steel plate 10 according to the present invention.

The ventilation heat shield steel plate 10 of the present invention uses an aluminum foil veneer 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 losing its functionality.

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

The ventilation heat shield steel plate 10 of the present invention uses aluminum foil veneers 12 instead of the heat shield material conventionally used, thereby reducing the amount of material required for conventional heat shields. 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.

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 plate 10 of the present invention, continuous production through mechanical use becomes possible, further improving productivity and reducing costs.

The ventilation heat-shielding steel plate 10 of 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.

The present embodiment has been described above, but it is possible to select and/or modify the configurations described in the above embodiment or to change them to other configurations as appropriate, as long as they do not deviate from the spirit of the present invention.

2 Outer exterior material 3 Inner exterior material 4 Heat shielding material 5 Ventilation layer 6 Concave and convex 10 Ventilation heat shielding steel plate 11 Steel plate 12 Aluminum foil single plate 13 Highly permeable resin layer (second highly permeable 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 Pipe 101 Inner wall surface 102 Inside (Ventilation layer)
F fluid (air)
X: Front-back direction Y: Up-down direction (vertical direction)

Claims (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: