Patent ID: 6818161
Filing Date: 2004-11-16
Classification: B29C,B29K,B32B,G10K,Y10T

Abstract:
A method for forming a molded article comprising the steps of:providing small resin pieces comprising thermoplastic resin and having a porosity of 45 to 80% in a most densely packed state; filling a mold with the small resin pieces; and heating the small resin pieces in said mold to thereby fuse the small resin pieces to each other and form said molded article, said molded article comprising open voids, a void content of 10 to 60%, and a bulk density of 0.01 to 0.6 g/cm3, and said molded article having not less than 3 continuous center frequency measuring points at which the sound absorption coefficient is at least 70%, and not less than 7 continuous center frequency measuring points at which the sound absorption coefficient is at least 50% in the sound absorption coefficients at the center frequencies of 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500 and 3150 (Hz), as determined by the measuring method of reverberant absorption coefficient as set forth in JIS A 1409.