KAJIAN EKSPERIMENTAL PEMANFAATAN KULIT KOPI SEBAGAI BAHAN PAPAN PARTIKEL UNTUK PENYERAP BUNYI (STUDI KASUS DI KABUPATEN BENER MERIAH DAN ACEH TENGAH)

Abstract

The growing demand for wood is not same by the availability of wood, so needed the other alternatives as a replacement, one of which is the use of particle board. The abundance of coffee skin in the regency Bener Meriah and Aceh Tengah is one of the potential that can be utilized to make particle board. This study aims to determines the physical properties, mechanical and absorption of particle board from coffee skin.

Making the particle board from coffee skin uses a synthetic adhesive urea formaldehyde (UF) with varying levels of adhesive at the 10% and 15% and the addition of wood particles variation of 0% and 30% with goal density of 0.4  g / cm ³ , 0.6 g / cm ³, 0.9 g / cm ³. Compression time of 10 minutes was using hot press machine at a temperature of 150 º C with a pressure of 200 bar. Testing of bonding internal and elasticity using a Universal Testing Machine Wood (UWTM) in Mechanics of Materials Laboratory of the University of Gadjah Mada. Data analysis of test results in the calculation of the MOE and MOR. For the absorption test using the  impedance tube at the Laboratory of Acoustics and Vibration of Mechanical and Industrial Engineering Faculty of Engineering, Gadjah Mada University.

From the results showed that the density, the amount of adhesive and the addition of a wood particles affect the value of MOR, MOE and bonding internal . Where the higher value of density and greater number of adhesive will increase the value of MOE, MOR and bonding internal  of the board. The lowest density of 0.31 g / cm ³ at the board adhesive 10% and 30% of wood particles with a density of 0.4 goals g / cm ³. While the highest density of 0.907 g / cm ³ at 15% adhesive and 30% wood particle density of 0.9 on the goal gr / cm ³. Value determination bonding internal lowest was 0.5 kgf / cm ² at 10% adhesive without  wood particles with  goals density of 0.4 g / cm ³. While the highest 3.8 kgf / cm ² on the board bonding internal  the density objectives 0.9 g / cm ³ 15% adhesive and 30% of wood particles. MOE values that produced a board that  no meets with SNI, and for all the MOR values of particle board with density 0.9 g / cm ³  goal of  SNI. Lowest sound absorption coefficient is 0.07 at a frequency of 1200 Hz and 0.88 at the highest frequency of 1000 Hz.