| 摘要 |
PURPOSE: A porous duct configured with a thin film is provided to dampen acoustical resonance by a porous wall without a film made of plastic materials and to prevent load loss related to air friction for fibrous materials. CONSTITUTION: An intake pipe(1), particularly for sucking in the air in an internal combustion engine, notably the engine of a vehicle has a first wall(2) made of a porous material and a film(4) being sufficiently thin for avoiding any incidence upon the acoustical characteristics and having notably a surface mass of less than 100 grams per square meter. The film is fixed onto the porous wall to prevent at least 50% of the surface of the film facing the porous wall from being fixed to the porous wall. The film is fixed to the porous wall along a point and/or a line.
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