1. INTERNATIONAL TECHNOLOGICAL SCIENCES AND DESIGN SYMPOSIUM, Giresun, Turkey, 27 - 29 June 2018, pp.1274-1283
Only some of the chicken feathers obtained as a by-products in white meat production are used for protein meal production, construction industry and composite panel production for different purposes. At least 50% of this material is waste. These wastes are also harmful to the environment. In order to obtain high value added products from this wastes, the studies which are conducted gives meaningful results. The chicken feather fibers obtained by cutting and separating from rachis part are universal and have multipurpose usage. The rachis material, which predominantly forms the half of the chicken feathers, is important with its light weight, high strength and other interesting properties. In these study, porous sandwich composite structures were developed using different matrices from rachis and their acoustic properties were measured according to the impedance tube method. Sound absorption coefficients of structures made from rachis show high values at high frequencies and show low values at medium and low frequencies. When the density of material increases, there is a noticeable improvement in the sound transmission loss value of material. Acoustic parameters improved with increase of layers in material. Because of the outer layers are composite, better results at low frequencies were obtained in terms of sound transmission loss. Acoustic parameters of sandwiched structures produced with conventional sound absorbing materials such as glass wool, rock wool and felt have caused significant increases in all frequencies due to rachis composites. In terms of acoustic comfort, it is thought that the composites produced from rachis are futuristic material.