| 摘要 |
PROBLEM TO BE SOLVED: To provide a flexible heat insulated duct for air conditioner piping excellent in heat resistance, dewing resistance, and sound absorbing property by forming an adiabatic duct which is provided with a fiber layer on the inner and outer surfaces of a pipe and an independent bubble resin layer and a continuous bubble resin layer as a middle layer, and providing spiral or ring-shaped reinforcing bodies. SOLUTION: In a duct used as a heat insulated pipe for air conditioner piping, an inner pipe 9 is formed by first providing an overlapped part 10, spirally winding a fiber layer on it, and binding and fusing reinforcing bodies 8 in the overlapped part 10. Also, a laminated foaming band body 6 is wound on the inner pipe 9 with its continuous bubble resin layer faced on the inner pipe 9 side, the resin film or sheet of a fiber layer band body 3 is heated and melted, it is wound spirally and fused on the overlapped part 10 provided on an independent bubble resin layer, and a part between the reinforcing bodies 8 is pressed while it is heated by disk rollers in parallel with the reinforcing bodies 8 so as to provide a bottom part shape. As a suitable fiber layer, unwoven cloth can be cited and, for example, needle punch unwoven cloth is used. |
