By exploiting the principle of Helmholtz resonance, ERCOLE MARELLI DOLUFLEX SRL has produced Phonoflex®, a sound absorbent sandwich panel containing no mineral fibres. Unlike traditional panels, the sound absorbent property is given by the actual structure of the panel due to the cavities formed by the internal corrugated plate. This particular structure enables Phonoflex® to limit the thickness and weight of the panel without any reduction in its sound absorbent capacity. The lack of porous materials guarantees a light weight, simple installation, storage and transport, and flame resistance.
Phonoflex® is completely recyclable!

ACOUSTICS IN BRIEF

The sound absorbent capacity of materials is quantified through the sound absorption coefficient αw, which is defined as the ratio between the absorbed sound power and the incident sound power.
The α value thus represents the fraction of sound energy absorbed by a given material and may vary between 0, if all the incident energy is reflected, and 1, if all the incident energy is absorbed. Consequently, if the value of α is 0.3, this means that 30% of the energy incident on the surface of the material is absorbed.
Nevertheless, for a specific material, the α value may vary according to the single frequencies and angle of incidence of the sound wave; for the sake of simplicity, the absorption coefficients are expressed as a function of the frequency in octave bands or one-third octave bands.

The Phonoflex® sandwich panels absorb sound and thus improve the acoustics of the environment in which they are installed, attenuating noise reverberation. In addition, by acting principally on the frequencies of speech, they make it more intelligible. Their numerous applications make them suitable for environments that require an improvement in sound quality, so that they can be used for a broader range of applications: cinemas, concert halls, conference and meeting rooms, offices and theatres.