| 摘要 |
A composite material formed of reinforcement fibers, acoustical enhancing fibers such as polyethylene terephthalate (PET) fibers or modified polyethylene terephthalate fibers, and one or more organic fibers is provide d. The acoustical enhancing fiber may be any fiber that provides increased or enhanced acoustical absorbance, particularly at low frequencies. The composi te material may be formed by partially opening wet reinforcing fibers, acoustic al enhancing fibers, and organic fibers, mixing the reinforcing, acoustical enhancement, and organic fibers, forming the fibers into a sheet, and bondin g the fibers in the sheet. Preferably the reinforcing fibers are wet use chopp ed strand glass fibers. The composite material may be formed of a single layer of reinforcement, acoustical enhancement fibers, and organic fibers. Alternatively, the composite material may be a multi-layered composite in which the acoustical enhancement fibers are located in an acoustical layer laminated to a thermal layer formed of the organic fibers and reinforcement fibers. |
