| 摘要 |
A noise attenuation panel (10) having a backing sheet (11), a facing sheet (14) and a cellular core (12) having a multiplicity of open-ended juxtaposed cells (15). The backing sheet (11) extends across the ends of the cells (15) at the rear of the core (12) and the facing sheet (13) extends across the ends of the cells (15) at the front of the core (12). The facing sheet (14) is made of a porous permeable thermoplastics material. The porous permeable thermoplastics material for the facing sheet (14) is produced by powder sintering a thermoplastics material. |
