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:: Volume 17, Issue 1 (10 2008) ::
aud 2008, 17(1): 1-10 Back to browse issues page
Manufacturing sound absorber based on combined recycling of polyethylene trephetalat and polystyrene at low and median frequencies
Zeynolabedin Ghanbarzadeh Alamdari 1, Ali Khavanin1, Mehrdad Kokabi2
1- Department of Occupational and Environmental Health, Faculty of Medical Sciences, University of Tarb
2- Department of Polymer Engineering, Faculty of Engineering, University of Tarbiat Modares, Iran.
Abstract:   (6302 Views)

Background and aim: Noise pollution is one of the main cause of occupational hearing loss. According to WHO reports in many countries workers have been exposed to 85 - 90 dB noise level. The purpose of this study is to manufacture a sound absorber based on combined recycled polyethylene trephetalat (PET) and polystyrene (PS) with an economical method in order to control of noise pollution
Materials and methods: Sound absorber were made of PET and PS with equal weight percent, polyester fiber, and polyvinyl acetate resine, with five to ten centimeters thick. Sound mean absorption coefficient percents were determined by acoustic impedance tube and compared with those of rock wool.
Results: Mean absorption coefficient percent of  samples with one to five millimeter pore size and ten centimeters thickness was significantly better than those with six to twenty millimeters pore size in 50 to 630, 1250, and 1600 Hz, (p<0.05). In general, samples mean absorption coehicient was significally different from those rock wool (p=0.005).
Conclusion: Recycle polymere absorbers may play an important role in national economics as they are prophylactic to some occupational disease and also are economical.

Keywords: plastic recycling, polyetylen trephetalat (PET), polyetylen (PE), combined recycling, low frequency, sound absorber
Full-Text [PDF 273 kb]   (4987 Downloads)    
Type of Study: Research |
Received: 2008/03/2 | Accepted: 2008/06/28 | Published: 2013/10/9
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Volume 17, Issue 1 (10 2008) Back to browse issues page
شنوایی شناسی - دانشگاه علوم پزشکی تهران Bimonthly Audiology - Tehran University of Medical Sciences
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