Classification of sound-absorbing panels

By Material
① Wood
Wooden sound-absorbing panels are meticulously processed according to acoustic principles and consist of a surface layer, core material, and sound-absorbing felt. Wooden sound-absorbing panels are divided into grooved wood sound-absorbing panels and perforated wood sound-absorbing panels.

② Mineral Wool
Mineral wool sound-absorbing panels have a rich variety of surface treatments and strong decorative effects. The surface-treated embossed mineral wool panels, commonly known as "caterpillar" panels, are covered with holes of varying depths, shapes, and diameters.

③ Fabric
Fabric sound-absorbing panels – the core material is centrifugal glass wool. As an acoustic material widely used around the world for a long time, centrifugal glass wool has proven to have excellent sound absorption performance.

Fire Resistance Performance
The fire resistance performance of sound-absorbing materials is crucial in public gathering places such as theaters, dance halls, auditoriums, multi-functional halls, and gymnasiums. Polyester fiber sound-absorbing panels have been tested by the National Fire Protection Testing Center for fire resistance parameters, and the results show that they have good fire resistance performance, meeting the national standard GB8624 B1 level requirements.

The product is widely used in: conference rooms, TV stations, studios, theaters, audio-visual rooms, opera houses, leisure and entertainment centers, hotels, multi-functional halls, concert halls, bars, restaurants, shopping malls, schools, auditoriums, gymnasiums, KTVs, etc.

By Environmental Protection Level
Sound-absorbing panels are classified according to the amount of formaldehyde released from the base material. There are three levels: E0, E1, and E2, where E0 is the highest environmental protection level (also the European environmental standard), E1 is the next highest, and E2 has the highest formaldehyde release. For direct indoor installation, E1 level is considered acceptable.

By Structure
① Sound-absorbing Wedges
Sound-absorbing wedges are a special sound-absorbing structural material used in strong sound fields. They are made by shaping and cutting porous (or fibrous) materials into conical or wedge-shaped sound-absorbing bodies that are firm and do not deform. Sound-absorbing wedges are suitable for strong airflow environments, mainly for high-quality anechoic chambers. They are more effective in absorbing low frequencies, can eliminate standing waves, and meet the requirements of eliminating echoes. The sound absorption coefficient at the low cutoff frequency is greater than 0.99. V-shaped and W-shaped sound-absorbing wedges made of polyester have the advantages of smaller volume and more reasonable price compared to ordinary sound-absorbing wedges.

② Diffuser
In addition to all the functions of flat sound-absorbing panels, diffuser sound-absorbing panels can also transmit sound waves at different angles through their three-dimensional surface, eliminating blind spots in the sound wave diffusion process, improving sound quality, balancing sound, reducing bass, and compensating for high frequencies.

Product structure:
The sound-absorbing material has a structure with three-dimensional triangular or cylindrical grooves on the front of the medium-density fiberboard and circular holes on the back. The surface is spray-painted (colors can be selected according to customer requirements), and fire-resistant sound-absorbing fabric is attached to the back.
Application scope:
TV stations, cinemas, opera houses, concert halls, conference centers, gymnasiums, sound rooms, homes, shopping malls, hotels, karaoke bars, lounges, restaurants, etc.

③ Aluminum Honeycomb Perforated Panel
The structure of the aluminum honeycomb perforated sound-absorbing panel consists of a perforated panel and a perforated back panel, directly bonded to an aluminum honeycomb core with high-quality adhesive to form an aluminum honeycomb sandwich structure. A layer of sound-absorbing fabric is attached between the honeycomb core and the panel and back panel. Because the honeycomb core in the aluminum honeycomb panel is divided into numerous closed small chambers, it prevents air flow, obstructing sound waves and improving the sound absorption coefficient (which can reach above 0.9). At the same time, it increases the strength of the panel itself, allowing for larger single panel sizes and further increasing design freedom. Different perforation rates can be designed according to indoor acoustic design, controlling the sound absorption coefficient of the combined structure within a certain range, achieving the design effect while reasonably controlling costs. By controlling the perforation diameter and spacing, and changing the perforation rate according to customer requirements, the perforation rate is ≤30%, and the hole diameter is generally selected from specifications such as ∮2.0, ∮2.5, and ∮3.0. The back panel perforation requirements are the same as the front panel, and the sound-absorbing fabric uses high-quality non-woven fabric and other sound-absorbing materials.

④ Perforated Wood Fiberboard
Perforated gypsum board consists of cylindrical holes that penetrate from the front to the back of the gypsum board. A breathable backing material and sound-absorbing materials that absorb incident sound energy are attached to the back of the gypsum board. The sound absorption mechanism involves a large number of tiny, interconnected pores within the material. Sound waves travel along these pores, interacting with the material through friction and converting sound energy into heat energy. The sound absorption characteristics of porous sound-absorbing materials show that the sound absorption coefficient gradually increases with increasing frequency, meaning that low-frequency absorption is not as effective as high-frequency absorption.