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Sound absorbing panels

Concept Using Helmholtz resonance, Ercole Marelli Doluflex srl developed Phonoflex®, a sound absorbing panel without mineral fibres. As compared to traditional panels, sound is absorbed by the panel’s internal corrugated core. This special structure allows Phonoflex® to reduce thickness and weight without compromising absorption performance. The lack of porous materials makes it light, easy to install, store, transport and fire resistant. Phonoflex® is totally recyclable! Phonoflex® is easy to work with and adapts well to various dimensional and aesthetic needs. This high technology product...

ECO-FRIENDLY Phonoflex® is totally recyclable LIGHTWEIGHT The average specific weight is 7.8 Kg/m2 FIRE RESISTANT Phonoflex® is non-combustible MODULARITY Phonoflex®’s modularity adapts to various environments REGISTERED TRADEMARK Phonoflex® is a registered trademark of Ercole Marelli Energy srl CLEANING Its microholes reduce dust cumulation in the cavities ONLY ALUMINIUM Absence of fibrous materials PERSONALIZATION Any modification is tested internally in our own reverberation room

Agnelli Metalli - restaurant False ceiling radiant heat-cold sound absorbing made with Phonoflex®, nominal thickness 20 mm, type 10-3-6, with double drilling of Ø 4 mm (drilling percentage: 1.80%) and Ø 2 mm (drilling percentage: 0.45%), horizontal step 22 mm, vertical step 32 mm. Architectural project by Marco Acerbis Acoustic indications The absorbing properties of materials are measured with sound absorption coefficient αw, that is, the ratio between the absorbed sound power and the incident sound power. The value α represents the absorbed sound energy fraction by a specific material and...

Polins - conference rooms and meeting rooms False ceiling with baffles realized with Phonoflex®, nominal thickness 20 mm, type 10-3-10, with drilling of Ø 2 mm (drilling percent: 0.66%) on both sides of the panel, step 22 mm. Architectural project by Marco Acerbis Drilled skin thickness [mm] Back skin thickness [mm] Corrugated core thickness [mm] Drilling percentage Sound absorption coefficient [αw] • Note: the details indicated beside refer to standard panel; on request it is possible to change these specifics in order to obtain more suitable results based on environment characteristics...

Helmholtz Resonance A sound wave is a vibration, the oscillation of a certain mass of air. When this air enters a hollow it causes pressure to increase, which pushes the air back outside, generating a depression in the inner part and a subsequent suction effect. This process cyclically repeats, with a specific frequency and decreasing strength. This reduction Sound absorption coefficient [αs] of air movement allows the noise to be absorbed (or rather for some of its frequencies). Sound absorption coefficient αs ISO 11654 Phonoflex® prepainted aluminium 100 125 Frequencies in ¹/³ octave...

Anchorage and jointing examples False ceiling Back joint “H” aluminium profile on not visible side View side Internal joint “Z” profile View side View side View side View side View side Visible joint Specifications Sound absorbing panel with cavity resonance, ensuring an absorption of medium and medium-high frequencies: the drilling corresponding to the corrugate core’s cavity transforms the panel into a Helmholtz resonator. With such conformation it is the only aluminium structure that absorbs sound, avoiding internal porous material layers. This makes the panel lightweight, structural,...

ERCOLE MARELLI DOLUFLEX SRL Via Lombardia, sn 24030 Medolago (BG) Italia Tel +39 035 4936411 - Fax +39 035 4931028 doluflex@doluflex.com www.doluflex.com