NOISE SUPPRESSION STRUCTURE MANUFACTURING METHOD

摘要

An open cell foam bulk absorber (106) is formed by pressurizing a foaming agent (308) and a foamable material (306), and then decompressing the foaming agent (308) and the foamable material (306). During decompression, the foamable material (306) and foaming agent (308) expand, and a plurality of open cells are formed in the foamable material (306), thereby producing an open cell foam bulk absorber (106). The open cells in the bulk absorber (106) have a distribution of sizes about a mean size, and a density gradient.