China Henan Zengtuo Industrial Co., LTD Company News

High-density polyurethane sandwich panels can play a role in insulation, and are mostly used in the interior and exterior wall panels of construction sites. To the insulation effect, the sandwich board can also achieve a certain fire effect, so how is it achieved?   The first thing to pay attention to is the raw materials of the product. The main materials of the factory are polyurethane foam and flame retardant, which is a self-breathing material that is not easy to burn and is not easy to burn in case of fire. Its softening point can be as high as 250 ° C, and it can be decomposed when encountering higher temperatures, fundamentally avoiding slightly higher temperature combustion.            ​     When the polyurethane core material burns, carbon deposits form on the foam surface. Not only does this layer of carbon not burn, it also insulates the flame from the underlying polyurethane foam, causing the flame to lose its burn and thus preventing the fire from spreading. At the same time, the high-density polyurethane insulation composite board will not produce harmful gases at high temperatures, and it is a safe insulation board, and the building insulation and fire prevention project can also be used with confidence.                         

Sandwich panels are one of the most economical thermal insulation solutions, offering increased durability, shorter installation times, less maintenance requirements, and increased sound and thermal insulation. In addition, they can be adapted to all building needs and types, with different types of panels for each case.                   Divide panel types by purpose   Exterior sandwich panel Sandwich panels come in a wide variety of finishes and are a popular choice for exterior wall decoration. The advantage of sandwich panels is that because the fixtures are hidden, the end result is very beautiful. Other advantages of sandwich panels include lightness, modularity and high insulation properties.   This type of sheet is mainly used for the insulation of external walls and walls, as well as the insulation of internal walls. They are suitable for industrial buildings, sports centres, residential and public buildings.         Roof sandwich In this case, unlike exterior panels, these panels are highly susceptible to rain, snow or wind, as well as their weight. They are installed on the roofs and decks of all types of buildings, although they are most commonly used on roofs with a slope of at least 7%.   Their installation is usually combined with waterproof joints, making installation quick and easy and without reducing the insulation of the roof. Self-drilling screws are also used to secure them to the structure and a sealing system is used to prevent water seepage.   The most basic roof sandwich panel models have no decorative exterior finishes. Therefore, it is possible to choose a tile type sandwich board with a metal sheet covering that has a similar appearance to tile. Therefore, it is mainly used in residential construction. There is also a sandwich panel specially designed for farm roofs that is specially treated to provide additional protection against the particular environmental conditions in which the panel is located.   Refrigeration panel These panels are also used to insulate temperature-controlled Spaces, such as cold rooms or freezers. In these cases, the sandwich plate type used is thicker to withstand extremely low temperatures. They provide the best insulation and are easy to install.   The characteristics and performance of the sandwich plate need to be considered     This modular prefabricated insulation system is a big advantage because it is light in weight and quick and easy to install. Similarly, the size,   thickness and surface treatment of the sandwich panels can be customized.   It also has a low thermal conductivity, making it an excellent thermal insulation material, is highly durable due to the protection of the outer   layer, and is also very fire resistant. The sandwich panel is also completely impervious to water, steam and air, which also extends its service   life. They also have excellent sound insulation.

  1. Process flow Construction preparation 1 Check purlin specifications and laying size 1 matching board 1 laying nail color steel sandwich board - water test 1 inspection   2. Operation method (1) Construction preparation: Before laying the nail sandwich board, the preparation work should be completed. Check purlin specifications and laying size: check whether the specifications, spacing and slope of purlin laying meet the structural design requirements, in addition to the end of each roof panel should be set purlin support, the middle part should also be set one to two more purlins.   (2) Plate allocation: Drawing plate arrangement diagram according to the design drawing and the size of the actual roof part on site, as the basis for cutting various plates, and numbering the cut plates according to the order of the arrangement diagram to facilitate construction.   (3) Laying and fixing color steel sandwich board When paving the board should be pulled through the line to achieve vertical and horizontal alignment. The long (longitudinal) lap should be located at the bar (the lap should be welded with double purlin or purlin side), the two boards should be extended to the support member, the support length of each board is greater than or equal to 50mm, the lap direction should be in the direction of the maximum annual wind lap, the longitudinal lap length is: when the roof slope is greater than or equal to 10% is 200mm; When the roof slope is less than 10%, it is 250mm. The end (transverse) lap should be connected in the direction of the current water, the length of the lap should be determined according to the specific plate type, and the direction of the lap should be consistent with the dominant wind direction; The roof plate starts from one end of the cornice, and is laid simultaneously to the other end and the direction of the roof ridge; When laying, the roof plate and the wall are fixed with the wall plate fixing clamp, the support at both ends of each roof plate should be fixed with self-tapping screws and purlins: longitudinal connection, the distance is less than or equal to 350mm, and the connection of each board with the same purlin and wall beam shall not be less than 3 points, non-longitudinal connection shall not be less than 2 points; The connection points at the ridge and cornice should be properly encrypted. When drilling, the roof plate and the strip should be drilled through vertically. When fixing bolts, the waterproof sealing gasket should be padded first, and the rubber gasket and stainless steel gland should be fastened firmly. When paving the board, the board is connected with the board with rivets, and the distance is generally 100mm~500mm. A long sealing strip should be placed at the long lap joints of the two plates, and two sealing strips should be placed at the ends. The sealing strips should be continuous and uninterruptable. The sandwich plate should be fixed with galvanized bolts with waterproof washers, and the fixing point should be set on the crest of the wave. All leaking screws should be protected by sealing materials, and there should be no leakage. After the bolts are tightened, the joints of the two plates are sealed with silicone sealant: After the board is laid, the long (longitudinal) joints of the two boards should also be connected with rivets, which are sealed with silicone sealant and protected by metal or plastic gland: Valley: Requirements for fixed position: self-tapping screws and rivets are set at the crest of the roof when used: set at the wave when used on the wall Ridge laying: First of all, along the ridge line in the adjacent two on the ridge board, the roof board is placed on the ridge board, the roof board, ridge board, purlin with bolts fixed; Secondly, polyurethane foam is filled into the concave space formed along the ridge of the two-slope roof panel, and then the polyethylene foam plug is glued to the end of the two-slope roof panel: Finally, the ridge board and the water baffle are fixed with rivets, and the long tape is added, as shown in the figure                   Cornice laying: along the end of the sandwich board, lay the cornice sealing plate and fix, the structure is shown in the figure             At the junction between the roof panel and the gable wall, the outer side of the roof panel and the top of the gable wall are uniformly wrapped with Angle plates, and the top of the Angle plate is set at a 2% slope to one side of the roof, as shown in the figure           Water test: After the roof board is nailed, spray wine can be taken to do water test, water time is not less than 2h, check whether the roof leakage phenomenon, if found problems, should be repaired in time to the leakage point. Inspection and acceptance: After the roofing board is nailed, the construction unit shall carry out internal inspection first and deal with the quality problems in time. After passing the initial inspection, the supervision and construction unit shall be organized to carry out the acceptance inspection and go through the acceptance procedures.

The importance of sandwich boards in the construction of prefabricated buildings   As a new type of building mode, prefabricated buildings have been widely concerned and applied for their characteristics of speed, environmental protection, and energy savings. As a common wall material in prefabricated buildings, sandwich board has the advantages of heat insulation, sound insulation, and fire prevention, so the installation and connection methods in the construction process are particularly important.      The sandwich panel before the installation of the preparatory work   1. Clean the base: Before installing the sandwich panel, it is necessary to clean the base first to ensure that the base is smooth and solid and to remove debris and dust to provide good installation conditions. 2. Base treatment: Select the appropriate base treatment according to the actual situation, such as brush primer, grinding, etc., to increase the base adhesion and surface smoothness.        The installation method of the sandwich plate is discussed.   1. Flat paste method: Stick the sandwich board horizontally on the treated base and use special glue or screws to fix it. This installation method is suitable for small-area sandwich plate installation because it is simple and convenient, but it is necessary to ensure that the bonding surface between the sandwich plate and the base is fully contact and firm. 2. Vertical mounting method: the sandwich plate is fixed vertically on the column, usually fixed by screws or nails. This method is suitable for large-area sandwich plate installation and can effectively improve construction efficiency and connection strength.   3. Hanging method: Install the sandwich plate through the hanging system. This method is suitable for high-rise buildings and places with large spans and has better performance in terms of safety and construction efficiency.   The connection method of the sandwich plate is discussed.   Screw connection: Tightly connect the sandwich plate to other components through reserved holes using screws. This is a common connection mode that is simple and easy to use and has good reliability.   Hook and groove connection: U-shaped grooves are arranged on both sides of the sandwich plate and are connected by biting the grooves with other components. This method is suitable for places that require frequent disassembly and combination, such as exhibition venues.    Welding connection: For some places with high special needs and requirements, welding methods can be used to connect the sandwich plate. By melting the edge of the sandwich plate, it is fused with other components to achieve a strong connection. 1. Sandwich plate                 deflection: In the construction process, there may be inaccurate installation of the sandwich plate. The problem can be solved by means of         adjustment tools or disassembly and re-installation, and inspected and re-removed in strict accordance with the design requirements.    Sandwich board surface pollution: During the installation process, due to improper operation or environmental factors, the surface of the sandwich board may be polluted. A cleaning agent can be used to wipe or sand the treatment to solve this problem. Cold bridge problem: When there is a certain gap at the sandwich plate connection, it may cause a cold bridge phenomenon, resulting in energy loss and structural problems. Filling materials can be selected to fill gaps, improve adiabatic properties, and increase structural stability. Case analysis of demonstration projects   Taking a prefabricated building project as an example, the advanced sandwich plate instal  

       Polyurethane sandwich panel is a high-efficiency and energy-saving building material widely used in building insulation, waterproofing, sound insulation, and so on. Its unique structure and performance make it an indispensable part of modern architecture. With the advancement of science and technology and the improvement of environmental awareness, the application of polyurethane sandwich panels will be more extensive and make greater contributions to the sustainable development of the construction industry.         What are the classifications of sandwich panels？   Rigid polyurethane sandwich panel (PU), extruded polystyrene sandwich panel (XPS), Rockwool sandwich panel (RW), polystyrene sandwich panel (EPS), Tripolyester sandwich panel (PIR)   Where is the main difference between panel ?   The material composition, performance characteristics, and application range of several sandwich boards are different. The inner core of polyurethane sandwich board is formed by polyurethane foam bonding; the inner core of rock wool sandwich board is rock wool; and the EPS polystyrene foam board is filled with EPS foam.   Different performance：   1. In terms of thermal insulation performance, rockwool sandwich board has a low thermal conductivity, which can effectively isolate the influence of outdoor high or low temperatures on indoor temperature. As a filler, rock wool is not easy to burn, has high temperature resistance, and can play a good protective role in the event of fire, with excellent flame retardant performance and safety.   2. Foam filler for polyurethane sandwich panels can provide a better insulation effect and keep the building at a stable temperature. In addition, polyurethane has excellent bonding properties, making the overall performance of the sandwich board more stable; excellent thermal insulation performance; superior mechanical properties; low volatile organic matter (VOC) emissions; and is environmentally friendly and sustainable.     The scope of the application is different：   1. Rock wool sandwich board is mainly suitable for external wall insulation of buildings, roof insulation, industrial plants, and other places requiring higher insulation and fire protection requirements.   2. Polyurethane sandwich panels are more commonly used in cold storage, refrigerator trucks, food processing plants, and other areas where it is needed to maintain a stable, low-temperature environment. Its good tightness and excellent thermal insulation performance enable it to effectively reduce energy consumption and maintain low temperature requirements.           Different customers need different plate uses; the selected plate is different, and we will provide customers with the best   choice of plate class. Welcome to order.