Design for Noise Reduction of the Interior of Building Using Microcellular Foamed Plastics

Abstract

The microcellular foamed plastics (MCPs) have high material strength, a relatively small cell size, and a high cell density in comparison with conventional foamed plastics. In particular, the small size of cell in MCPs makes many applications possible in a range of fields. Its high reflectivity enables its application as a reflector that is a part of the back light unit in the LED industry. Thanks to its low density and high strength, MCPs can be used as diaphragm in speakers. They also have many other uses. MCPs show a noise suppression property which allows them to be used in the building industry. A soundproofing plate made of MCPs exhibits a better soundproofing property in comparison with a soundproofing plate made of ordinary plastic. In this study, the author manufactured a soundproofing plate using microcellular foamed polypropylene (PP) and assessed the properties of the absorbing and proofing sound. As a result, the findings showed the possibility of using MCPs as a soundproofing plate in the building industry.

Research progress of noise reduction of composite structures of porous materials and acoustic metamaterials

“…The advantages of foamed plastic porous materials over foamed metal and foamed glass porous materials are their light weight, affordability, and stable performance. Foamed plastic porous materials [73] are generally obtained by adding auxiliary materials such as foaming agent to resin materials, adding gas and molding. Polyurethane foam [66,67] and polyvinylidene fluoride foam [68] are commonly used.…”