Fabrication and mechanical analysis of spent tea leaf materials for sound absorption

Shim, Fiona May Fa (2015) Fabrication and mechanical analysis of spent tea leaf materials for sound absorption. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This research focuses on the fabrication and mechanical analysis of spent tea leaf materials for sound absorption. Spent tea leaves (STL) which are known as waste materials in tea producing factories have been considered as new natural resources for sound absorbing natural rubber foam composite materials. The objectives of this research are to determine the physical properties and to study the sound absorption properties of sound absorbing materials made of spent tea leaves filled natural rubber foam (STL/NR) composites and compressed spent tea leaves materials. This research deduces the fabrication and characterization of sound absorbing materials. Two grades of STL are used in this research, which are BHE-BM and BHE-SW from the stalk of the tea plant. The fabricated composites are subjected to microscopic observation, physical and sound absorption testing. From this research, the sound absorption results has shown that compressed spent tea leaves of finer grade BHE-SW provides the best sound absorption coefficient. Furthermore, increased air gap thickness also increases the sound absorption coefficient and shifts the peak of absorption to lower frequency region.

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