CELLULOSE-BASED SPRAYED COATING FOR SOUND ABSORPTION
Sonaspray coatings are used to reduce reverberation time (boom) and reduce noise levels in public and entertainment areas. Unlike slabs for room acoustics common on the Russian market based on glass and basalt fibers, for example, Ecophon ceiling and wall panels), the main component of Sonaspray coatings are cellulose fibers. They are harmless to breath and do not cause allergies, which makes the coatings environmentally friendly.
The Sonaspray coating technology also gives them a number of advantages over conventional sound absorbing boards. The creation of the finished Sonaspray coating occurs by applying (spraying) cellulose flakes impregnated with glue onto the selected surface. Spraying is carried out using specialized equipment - the Ranger installation (Ranger). Cellulose flakes are fed by air flow from the installation container to the spray gun, where they are mixed with glue and applied to the surface to be treated (wall, ceiling, etc.). This technology makes it possible to obtain a seamless acoustic coating on a surface of arbitrary shape, as well as to carry out fragmentary processing of selected areas. Compared to sound-absorbing boards like Ecophon, this makes it possible to find non-standard design solutions, organically fitting acoustic coatings into the existing interior.
Due to the unique adhesive composition, Sonaspray coatings can be applied without special preparation to various building materials, including concrete, brick, drywall, glass, galvanized metal, etc. High adhesion of the adhesive allows you to create durable coatings with a thickness of up to seven centimeters. With a coating thickness of 2 cm, the additional load is distributed evenly on the ceiling structures and is only 2.1 kg / sq.m. A smooth surface and a given thickness of the finished coating are ensured by spraying in several layers (the thickness of one layer is 4-5 mm).
High productivity is another distinguishing feature of Sonaspray coatings. With full observance of the application technology, the speed of work reaches 300 sq.m./day on some projects. This allows you to install coatings in the shortest possible time without making significant changes to the existing schedule for other finishing works.
The texture of the finished Sonaspray coatings outwardly resembles plaster “under a fur coat”. There are two standard types of Sonaspray coatings: Sonaspray K13 (Sonaspray ka-thirteen) and Sonaspray FC (Sonaspray ef-si), which differ in the size of the flakes included in their composition. The Sonaspray FC coating contains smaller cellulose flakes (3-5 millimeters in size) and, as a result, has a more uniform surface texture.
| Sonaspray K13 | Sonaspray FC | Sonaspray FCX |
The absorption (attenuation) of a sound wave in Sonaspray coatings occurs according to the same mechanism as in sound-absorbing boards based on glass / basalt fibers. When a sound wave passes through a porous structure of cellulose fibers, the vibrational energy of the air is converted into heat. The efficiency of sound wave absorption increases with increasing coating thickness. Sonaspray coatings and Ecophon sound absorbing boards have comparable curves for SFC (sound absorption coefficient) over the entire frequency range.
| Reverberation curves of Sonaspray K13 and Ecophon panels mounted in contact with the substrate |
The color scheme for Sonaspray coatings can be created both by pigment coloring of cellulose flakes during the production process, and as a result of additional painting of the surface of the finished coating with water-based paint.If necessary, Sonaspray coatings can be cleaned with a vacuum cleaner (for large areas cleaning with compressed air from a compressor is recommended). In practice, cleaning of Sonaspray coatings applied to ceiling structures is required no more than once every 2-3 years, due to the action of antistatic additives included in the cellulose flakes.
Sonaspray coatings are the most technologically simple, economical, and effective solution for creating acoustic comfort in rooms with large internal volumes. In Russia, Sonaspray coatings are already successfully used to reduce noise levels in nightclubs, restaurants, theaters, shopping malls, industrial premises, sports halls and ice arenas. Certifications Sonaspray has acoustic, hygienic and fire safety certifications.
