The present invention is directed to a process for the manufacture of three-dimensional acoustically sound automotive insulation parts. In particular, the process includes mixing a two component polyurethane resin, applying the resin to a substrate, molding the substrate and then trimming and demolding...http://www.google.com.tw/patents/US6773756?utm_source=gb-gplus-share專利 US6773756 - Process to manufacture three dimensionally shaped substrate for sound abatement
