When dining in a restaurant, sometimes I have to shout at the opposite table. Is such a noisy dining environment just because we Chinese are so lively? uncertain! It may be that the acoustic material is useless.
Acoustic materials touch all aspects of life. In the United States, only a small part of acoustic materials are used in the field of music recording, and more are used in the construction and decoration of houses, hotels, restaurants, office buildings, gymnasiums, etc. There are three common types of domestic acoustic materials, but each has serious problems.
1. Sponge soft bag
This material is extremely dangerous, and the bloodiest lesson was the fire in a bar in Santa Maria, Brazil, in January 2019. That fire killed more than 200 people and injured hundreds. The wounded crowded all the local hospitals. It can be seen from the live video and pictures that the fire was very large, the flames jumped several floors high, and the fire lasted for several hours before being extinguished. The Los Angeles Times said it was the deadliest fire in the world in the past decade.
According to the investigation, the home band used fireworks to perform in the nightclub in order to create an atmosphere that night. Maybe a spark accidentally hit the soundproof foam wall. Spread quickly along the ceiling. Santa Maria Police Chief Marcey said that the foam material on the ceiling of the nightclub is flammable and can only eliminate echoes and cannot be used as a sound insulation material.
In addition to being unsafe, his sound-absorbing effect is also unstable, because the sponge is made by constantly stirring the raw materials, heating them and then pressing them into shape. Therefore, the density of each batch of sponges is different. The sound absorption effect is also different.
2. Polyester fiber sound-absorbing board
The sound-absorbing properties of polyester fiber sound-absorbing panels are similar to other porous materials. The sound-absorbing coefficient increases with the increase of frequency. The high-frequency sound-absorbing coefficient is very large. sound-absorbing properties. The noise reduction coefficient is about 0.8 to 1.10, making it a high-efficiency sound absorbing body with a wide frequency band. And this material can be made in various colors, very beautiful, and easy to install. However, the biggest disadvantage of polyester fiber sound-absorbing panels is that the low-frequency sound absorption is poor. Due to the limited structure of its material, it has poor absorption of low-frequency sound, such as noise generated by electrical appliances, such as the mopping sound generated by slippers upstairs, the sound of the wall caused by the vibration of the neighbor’s house, and the vibration sound generated by the ground is difficult to eliminate.
3. Wooden sound-absorbing panels
Many companies go abroad to inspect and see that the new wood materials used by people are very beautiful and effective, so they come back to study, and they also clad wood when decorating. In fact, this surface wood sound-absorbing material, the article is at the back, what really affects the sound is the sound-absorbing cavity behind it. Domestic enterprises follow the example of installation, often only the surface of the wood. Without a cavity behind it, of course, there is no attraction whatsoever.
Post time: Feb-28-2022