SIFAT MEKANIS LAMINASI LIMBAH KULIT JAGUNG (ZEA MAYS) SEBAGAI BAHAN BAKU ALTERNATIF

Abstract

Utilization of waste materials with various engineering for the manufacture of products in all fields has been done by many people to get a new alternative of material. One of these materials is corn skin that has a strong nature, light, and significant texture which make it a potential waste material. This research studies the utilization of corn skin through lamination process, which then put a tensile test and acoustic test/damping power by measuring the coefficient of damping to the sound. The method used in this research is experiment in laboratory by making lamination which is laying arrangement process with number of layers starting from 5, 10, 15, 20 and 25 layer using wooden adhesive then pressing. After forming the laminated sheets, the specimens are made according to ASTM D638 standard for tensile test and ASTM E-1050-98 standard for acoustic test of specimen. The research results indicates that the laminate of corn skin produced the highest tensile strength value of 18.34 N/mm² on the layer number of 10 layers. The value of this tensile strength is in the category of class V of wood power that can only be used for temporary construction. While the result of acoustical test indicated that the ability of sound damping shown with the highest of (α) 0.266 coefficient value with the number of layers of 5 layers at low frequency (<4000 Hz). Whereas for high frequency (> 4000 Hz), the reducing coefficient (α) is 0.382 with lamination of 10 layers. Compared with other materials, the results of this lamination of con skin at low frequency of (1000Hz) with α = 0.075 have better sound dumping value than play wood material (α = 0.05) and  styrofoam (α = 0.07), so it can be used as an alternative material for sound absorbers such as:; floors, walls, recording studio rooms, inner walls and sound speaker boxes.