The internal fibers of centrifugal glass wool are fluffy and intertwined, and there are a large number of tiny pores. It is a typical porous sound-absorbing material and has good sound-absorbing properties. Centrifugal glass wool can be made into wall panels, ceilings, space sound absorbers, etc. It can absorb a large amount of sound energy in the room and reduce the reverberation time, which is beneficial to improving speech intelligibility and reducing indoor noise. Filling the cavities of lightweight partition walls with centrifugal glass wool not only plays a good role in thermal insulation, but also greatly improves the sound insulation performance of the wall, which is beneficial to isolating noise and ensuring the privacy of indoor conversations. sex. The sound of people's normal speech is about 60-70db, and the sound of shouting loudly can reach 100db.

The concept of decibel is quite special. Its calculation is not a linear proportion, but a logarithmic proportion. For example, if two speakers emit a sound of 60db respectively, the combined sound is not 120db, but 63db. If a certain sound-absorbing material absorbs 80% of the sound energy, the sound reduction is not 0.8db nor 80db, but 10lg(1-0.8)=7db. If the sound insulation of a certain partition wall is 50db, then the sound transmitted through is 0.00001.

It is generally considered that materials with nrc less than 0.2 are reflective materials, and materials with nrc greater than 0.4 are considered sound-absorbing materials. When it is necessary to absorb a large amount of sound energy to reduce indoor reverberation and noise, it is often recommended to use materials with high sound absorption coefficients. Centrifugal glass wool is a high NRC sound-absorbing material. The NRC of 5cm thick 24kg/m2 centrifugal glass wool can reach 0.90. (nrc is the noise reduction coefficient). Generally, the sound insulation of glass wool felt is 50-60db. Rubber and plastic ones are slightly worse.

In general halls, including halls for language, music or comprehensive performances, such as concert halls, lecture halls, theaters, cinema auditoriums, gymnasiums, multi-purpose halls, conference rooms, studios, recording studios, auditoriums, etc. Sound studios, rehearsal halls, museums, exhibition halls, KTV private rooms, offices, business halls, reception rooms, auction halls, waiting (machine) rooms, trial halls and other places all need sound absorption to obtain good sound quality; in places where noise control is required Rooms, such as restaurants, libraries, galleries, fitness centers, shopping malls, hotel lobbies, wards, workshops and other places also need sound absorption and noise reduction; there are also residential bedrooms, study rooms, home theaters, etc. with special sound quality requirements that need sound absorption. deal with. In these places, centrifugal glass wool can be used for sound absorption.

Provided by Zhengzhou Hongwei Insulation Materials