| 摘要 |
PURPOSE: A manufacturing method of an acoustical absorbent having excellent fire resistance is provided. The acoustical absorbent is useful for a soundproof wall. CONSTITUTION: The acoustical absorbent is obtained by the steps of: manufacturing web comprised of polyester fiber having a melting point of 250-270deg.C as a main material and polyester fiber having a melting point under 110deg.C of as a fixing agent, followed by carding; needle-punching under 500times into one square inch to give adhesion, followed by drying; and spraying a liquid retardant to a surface of the absorbent within a range of 10-500g/m¬2 to give fire-proof, followed by grinding and forming. |
