The sound insulation performance of laminated glass is mainly determined by the actual thickness of glass, the thickness of laminated film and the flexible vibration damping performance of laminated film. From these aspects, the sound insulation performance of laminated glass is analyzed.
Surface density (material density and thickness product) determines the volume of the overall insulation; Those who have learned about laminated glass know that laminated glass is generally composed of two layers of glass and film, with small thickness and large glass density, so laminated glass surface density is large, and its sound insulation performance is the most ideal. Soundproof Windows are made of high density PVB laminated glass, also known as explosion-proof safety glass. Glass density is very high, a layer of soundproof glass, close to 20cm thick wall, can effectively resist the penetration of low-frequency noise, only soundproof glass per square meter weight of 18kg.
The purpose of noise reduction and vibration control is to find that the acoustic frequency of the matching effect is not in the frequency range of the need for noise reduction; The anastomosing effect of laminated glass appears at about 3000Hz, which is far away from the traffic noise of medium and low frequency. It is the ideal soundproof glass used in the busy traffic road at present.
The film in the middle of the laminated glass is equivalent to a damping layer, which can effectively inhibit the vibration of the glass, thus improving the sound insulation performance of the glass. As is known to all, sound waves strike glass and make glass vibrate to spread noise. Single-layer glass, insulating glass, vacuum glass and laminated glass all vibrate due to the impact of sound waves, and the vibration generates sound. However, the film blocking of laminated glass effectively reduces the vibration of glass.
The overall sound insulation performance of laminated glass is better (improve 1~3 dB), especially for the sound insulation performance of low frequency. As a result, laminated glass because of its own structure and material, its sound insulation performance is very ideal, because of its excellent material, durable use, is the best material for sound insulation window.