| 摘要 |
The invention concerns unitary acoustic sanitary ducts in buildings and includes the use of a tubular member, obtained by extruding or injecting thermoplastic materials and comprising a rigid protective outer sleeve and a flexible inner acoustic sleeve, wherein the protective sleeve (3) is in optionally cellular PVC, the acoustic sleeve (2) contacts the liquid carried by the duct and is made from plasticized, filled PVC with a Shore A hardness of 65 to 85, and the inner wall of the acoustic sleeve has continuous helical threads (4) made from the same acoustic material as that used for the sleeve (2). The sleeve-acoustic helical threads combination reduces the noise caused by discharge fluids from sanitary or domestic appliances. |
