Sound absorption boards are classified by structure

1. Sound absorption wedge: Sound absorption wedge is a special sound absorption structural material used for strong sound absorption fields. It is formed and cut from porous (or fibrous) materials, and made into conical or wedge-shaped sound absorption bodies that are firm and not deformed. Sound absorbing wedges are suitable for strong airflow environments, mainly targeting high-quality anechoic chambers, which are more effective in absorbing low frequencies and can eliminate standing waves, achieving the requirement of eliminating echoes. The low cutoff frequency sound absorption coefficient is greater than 0.99. Compared with ordinary sound-absorbing wedges, V-shaped and W-shaped sound-absorbing wedges made of polyester have the characteristics of smaller footprint and more reasonable price.
2. Diffusion type sound-absorbing board (three-dimensional diffusion type sound-absorbing board): In addition to having all the functions of a flat sound-absorbing board, the diffusion type sound-absorbing board can also conduct sound waves at different angles through its three-dimensional surface, eliminate blind spots in the diffusion process of sound waves, improve sound quality, balance sound, reduce stress, weaken high notes, and compensate for low notes. Product structure: A three-dimensional triangular or cylindrical groove is opened on the front of the medium density fiberboard, and a circular hole is opened on the back of the structural sound-absorbing material. The surface is painted (color can be selected according to customer requirements), and the back is covered with fire-resistant sound-absorbing cloth. Application scope: TV stations, cinemas, opera houses, concert halls, conference centers, gyms, sound rooms, home furnishings, shopping malls, hotels, karaoke, lounges, restaurants, etc.
3. Aluminum honeycomb perforated sound-absorbing panel: The structural structure of the aluminum honeycomb perforated sound-absorbing panel is a perforated panel and a perforated back panel, which are directly bonded to the aluminum honeycomb core with high-quality adhesive to form an aluminum honeycomb sandwich structure. A layer of sound-absorbing cloth is pasted between the honeycomb core, the panel, and the back panel. Due to the honeycomb core inside the honeycomb aluminum panel being divided into numerous enclosed small chambers, air flow is blocked, sound waves are obstructed, and the sound absorption coefficient (can reach 0.9 or above) is increased. At the same time, the strength of the panel itself is improved, allowing the size of a single panel to be larger, further increasing the design freedom. According to indoor acoustic design, different perforation rates can be designed to control the sound absorption coefficient of the combined structure within a certain range, achieving both design effects and reasonable cost control. By controlling the perforation aperture and spacing, and changing the perforation rate according to customer usage requirements, the maximum perforation rate is less than 30%. Generally, the aperture size is selected to be less than 2.0, less than 2.5, less than 3.0, and other specifications. The perforation requirements for the back panel are the same as those for the panel, and high-quality sound-absorbing materials such as non-woven fabric are used for the sound-absorbing cloth.
4. Wooden perforated sound-absorbing board: The perforated gypsum board has cylindrical holes that run through the front and back of the gypsum board, and is composed of breathable backing materials and sound-absorbing materials that can absorb and emit sound energy pasted on the back of the gypsum board. The sound absorption mechanism is that there are a large number of small connected pores inside the material, and sound waves can penetrate into the material along these pores, causing friction with the material and converting sound energy into thermal energy. The sound absorption characteristics of porous sound-absorbing materials gradually increase with the increase of frequency, which means that low-frequency absorption is not as good as high-frequency absorption.