Which kind of  sound-absorbing materials  is good for  the theater?

       With the improvement of people’s living standards, people are beginning to pursue high standards and high quality of life. More and more people choose theaters as places for leisure and entertainment, but they also put forward higher standards for the theater’s environment and sound effects. Claim.       

       Therefore, the decoration of the theater includes consideration of the influence of the building structure on the shape and symmetry diffusion, sound reflection, reverberation, and the builder's acoustic defects. The use of sound-absorbing materials is determined according to the results of acoustic measurements.

As the name implies, sound-absorbing materials have a strong absorption effect on sound, so as to achieve the effect of noise reduction. However, the types of existing sound-absorbing materials on the market are complex and diverse. Each type of sound-absorbing material has its own characteristics. Which sound-absorbing material is effective depends on the theater's requirements for sound-absorbing materials. The melamine sponge supplied by Xiamen Sihang Nano Technology Co., Ltd. has a three-dimensional network structure with extremely high open porosity (the open porosity of the melamine foam with a density of 9kg/M3 is as high as 99%) The vibration that makes the sound wave can easily and effectively enter the deep layer of the foam and transform into a grid can be consumed and absorbed, and effectively eliminate the reflected wave, the sound absorption coefficient is as high as 0.95, and it can effectively absorb the thunder-like sound of the theater from multiple angles , To reduce the sense of vibration. Melamine sponge will gradually replace commonly used sound-absorbing and thermal insulation materials such as glass wool, felt, ordinary foam, polyurethane, asbestos, polystyrene and polyethylene, and become a new type of sound-absorbing product attracting attention in the market.

       Melamine sponge is an excellent sound-absorbing material. A fully open three-dimensional grid structure system has a grid length-to-diameter ratio (that is, L/D) between 10 and 20, and an open porosity as high as 99%. Its extremely high open porosity enables sound waves to enter the deep layer of the foam effectively, and converts the vibration of the sound waves into the vibration of the grid, so that the sound waves are consumed and absorbed, and the reflected waves are effectively eliminated.

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       According to BASF's test, the melamine sponge with a thickness of 5cm absorbs more than 90% of medium and high frequency sound waves, and this sound-absorbing property has not changed significantly after its surface is covered with materials such as non-woven fabrics or textiles. At the same time, due to the fully open three-dimensional grid structure, the density of the melamine sponge is very low, only 10Kg/M3, which makes it convenient to be used as a sound-absorbing material for decoration.

        Currently, airports, railway stations, recording studios, theaters, factories, etc. all use a large amount of melamine sponge as sound-absorbing materials. It is not only flame retardant, but also has no drips and no toxic smoke. Melamine foam has excellent flame-retardant effect. The surface only starts to burn when it is in contact with an open flame. Once it starts to burn, it will immediately decompose and produce a large amount of inert incombustible gas to slow down the burning speed. At the same time, the burning surface quickly forms a dense coke layer , So as to effectively block the development of combustion to the deep level, and the open flame will automatically extinguish after leaving.

       Without any flame retardants, melamine foam can meet the B1 low flammability material standard (German standard) specified by DIN4102, and the UL94-V0 high flame retardant material standard (American Insurance Association standard). As two important indicators of material combustion evaluation, the dripping property and smoke density of the material in the combustion process are often ignored by users. General foam plastics, such as polyethylene, polystyrene, polyurethane, etc., will melt and produce droplets when burning. The burning droplets will flow along ceilings, walls, pipes, etc., quickly causing the spread of fire. Adding flame retardants to improve the flame retardancy of the material is powerless to this fatal disadvantage of the material. Melamine sponge will not melt during the combustion process and will not produce drips. Polystyrene, polyurethane and other materials will produce a lot of toxic smoke during the combustion process, and because many flame retardants will decompose at high temperatures and release deadly toxic gases, flame retardant modification and smoke inhibitors are often added It will bring about negative effects such as increased toxicity and increased cost. The amount of smoke produced by melamine sponge t during combustion is much lower than that of the above materials, and it will not release deadly toxic gases and will not cause environmental pollution. Excellent thermal insulation material and strong thermal stability. Melamine sponge has a three-dimensional grid structure system with sufficient openings. Its density is only 10Kg/M3 and the opening rate is as high as 99%. Its three-dimensional grid structure can be effective. Blocks the spread of heat through air convection.

       At the same time, melamine sponge is a thermosetting plastic, and its high three-dimensional grid structure system makes it have a higher heat than polyethylene, polystyrene thermoplastic materials, and polyurethane materials with a lower degree of cross-linking. Stability and aging resistance. Melamine foam can work at 180°C for a long time without decomposition and deformation. Only when it is in a high temperature environment above 400°C does it appear obvious decomposition. The working temperature of polyolefin, polystyrene, polyurethane and other foam plastics is only 90°C, and when it exceeds 80°C, decomposition and deformation will occur, especially shrinkage and deformation will occur, which will seriously affect the insulation performance. It is the characteristics of light weight, flame retardant, and strong thermal stability of melamine sponge that make it an irreplaceable lightweight thermal insulation material. The chemical-resistant and hygienic melamine foam is made by high-temperature foaming without residual free formaldehyde. Its stable chemical structure and cross-linking system make it unique chemical and physical stability, and will not produce droplets. It will not easily produce fragments, and its hygiene can meet the requirements of food hygiene. These characteristics make it widely used in the fields of daily necessities, interior decoration and transportation noise reduction decoration, and make the installation very convenient.

       Good secondary processing performance and easy installation characteristics. Melamine sponge can be easily processed into sheets and special-shaped materials by cutting, cutting, turning and other machining methods; the surface can be processed to meet the requirements of sound absorption Cone-shaped and tapered sound-absorbing products; melamine sponge can be made into a sheet with a thickness of only 1mm; it can be made into special materials that meet various shape requirements by hot pressing. For example, a sheet of melamine sponge can be made into a sound-absorbing ceiling and a sound-absorbing partition with embossed patterns by hot pressing; the sheet can be made into a roll like a "non-woven fabric" by hot pressing; Into the sound-absorbing material inside the machine that meets the shape requirements.