To improve heat insulating sound absorption and flexibility, by arranging an inner wall in which an air permeable tape is spirally wound and an outer wall in which a flexible tape is spirally wound, and arranging a hard spiral partitioning wall between the inner and outer walls, and filling a sound absorbing heat insulating member in a spiral space.
In an inner wall 2, an air permeable tape such as a polyester nonwoven fabric is spirally wound and the side edges of the permeable tape are connected to each other. In an outer wall 3, a synthetic resin tape such as soft vinyl chloride is spirally wound at a constant interval around the periphery of the inner wall 2, and the side edges of the synthetic resin tape are connected to each other. In a hard spiral reinforced partitioning wall 4, a platelike synthetic resin such as polyethylene is spirally wound around the peripheral surface of the inner wall 2 while a lower end surface 4a whose thickness is a little bit increased is fixed and erected in a peripheral direction, and an upper end surface 4b is fixed to the inner circumferential surface of the outer wall 3. Therefore, the partitioning wall 4 is made to serve as a spiral partitioning wall between the inner wall 2 and the outer wall 3 so as to form a spiral space, and a sound absorbing heat insulating member 5 formed of a foaming resin tape having a successive bubble structure, such as foaming urethane, is filled into the spiral space. Therefore, flexibility, heat insulation and sound absorbing property can be improved.
SHIGA YASUSHI
INAGAKE TETSUYA
HATTORI SHOJI
YOSHITOMI YOSHIKI
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