FIBROUS ACOUSTIC BOARD AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a fibrous acoustic board for a speaker diaphragm with enhanced acoustic characteristics by improving the elastic coefficient, density and internal loss of the fibrous acoustic board without the need for a greater additional cost for its manufacture. SOLUTION: The fibrous acoustic board 10 contains cellulose fibers and the cellulose fibers are processed by using water vapor whose temperature is within a range of 100 deg.C to 200 deg.C for 1 to 120 minutes. Pulps may be paper- made and formed after the water vapor processing or after the pulps may be paper-made and formed and then water-paper-processed.