Fibrous materials have a place in noise reduction applications thanks to their porous structure. Various fibrous materials for noise reduction include inorganic and metallic fibers, synthetic fibers, natural fibers, and nanofibrous membranes. Alfa Chemistry provides customers with fiber solutions for noise reduction applications, according to techno-economic requirements or considerations.
Introduction
Not all materials can achieve sound insulation and noise reduction. The main factors affecting the noise reduction performance of materials include density, porosity, flow resistivity, cell size and tortuosity. Among them, the density should be in an appropriate range, too low to cause sound waves to pass through, and too high to cause sound waves to be reflected on the surface. Porosity is advantageous in terms of sound wave absorption and disadvantageous in terms of sound wave blocking.
Fiber Noise Reduction Solutions
- Metal Fibers for Noise Reduction
As the basis of metal porous materials, metal fibers have the advantages of corrosion resistance, high temperature resistance, and long service life. In recent years, stainless steel fibers, nickel fibers, aluminum and its alloy fibers, iron intermetallic compound fibers, etc. have been developed as noise reduction materials. For example, aluminum fiber sound-absorbing panels are widely used sound-absorbing materials, with high compressive strength, long service life, and low thermal conductivity. - Inorganic Fibers for Noise Reduction
Inorganic fibers, including glass fibers, carbon fibers, and basalt fibers, are also candidates for noise reduction applications. Acoustic fiberglass, for example, has the ideal combination of rigidity and light weight for preventing reverberation and echoes. The glass fiber felt with hierarchical structure can significantly improve the airflow resistance rate and sound absorption performance.
The internal structure and cross-sectional structure of glass fiber felts (low (L), middle (M) and dense (D) density) with different densities. [1]
- Synthetic Fiber for Noise Reduction
The structural diversity of synthetic fibers increases noise reduction efficiency. Polyester is typical, and its sound absorption increases with the frequency of the sound, causing it to be most effective at high frequencies. It has a Noise Reduction Coefficient (NRC) rating between 0.8 and 1. In addition, polyester fibers have high tensile strength, and satisfactory properties such as abrasion resistance, fire resistance, wrinkle resistance, stretch resistance, impact resistance and abrasion resistance include. These properties make it an excellent soundproofing material in industrial and heavy machinery environments. - Profiled Fibers for Noise Reduction
Profiled fibers with hollow, triangular, etc. cross-sections exhibit improved sound absorption properties compared to synthetic fibers with generally circular cross-sections. For instance, Hollow polyester fibers are reported to have higher sound absorption and lighter weight than ordinary polyester fibers.
Related Fiber Series
The following are some fiber series you may be interested in, click to quickly browse related products and services.
Reference
- Xiaoning Tang, et al. Composites Part A: Applied Science and Manufacturing, 2017, 101, 360-380.
Our products and services are for research use only.
