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Advances in Materials Science and Engineering
Volume 2015, Article ID 274913, 5 pages
http://dx.doi.org/10.1155/2015/274913
Research Article

Mechanic and Acoustic Properties of the Sound-Absorbing Material Made from Natural Fiber and Polyester

1Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China
2GuangXi Zhuang Autonomous Region Forestry Research Institute, Nanning 530002, China

Received 16 October 2014; Accepted 31 December 2014

Academic Editor: Xinfeng Xie

Copyright © 2015 Limin Peng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A sound-absorbing composite material made of wood fiber and polyester fiber was produced using polyester foam technology and wood-based composite technology. This study investigated the physical and mechanical properties and the effects of the airflow resistivity of the materials and the depth of the cavities behind on sound-absorbing performance of the composite material. The results showed that the composite of best physical and mechanical properties and sound absorption was made with a 150°C hot-pressing temperature, 10 min hot-press time, 3 : 1 the ratio of wood fiber to polyester fiber, foaming agent content of 8%, and the nominal density of 0.2 g/cm3; the composite material yielded superior sound absorption property with the airflow resistivity of 1.98 × 105 Pas/m2; the acoustic absorption peak moved to lower frequencies when length of the cavities was increased.