| 摘要 |
PROBLEM TO BE SOLVED: To provide a silencing material having durability against exhaust gas, and to provide its manufacturing method. SOLUTION: A large number of basalt yarns is produced, that basalt is dissolved to produce long fibers are bundled by greige goods, to form a bundled material 1. The bundled material is cut into short fibers, the cut bundled material is fibrillated and formed in a bulky state, and the bulky materials are stacked and formed in a mat-form using a needle process to produce the silencing material 3.
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