| 摘要 |
PROBLEM TO BE SOLVED: To provide an air conditioner duct excellent in heat insulation dewing resistance, and sound absorbing property by forming a pipe body with a fiber layer, an independent bubble resin layer, a continuous bubble resin layer, and reinforcing bodies, positioning the fiber layer on the outside of the pipe and the continuous bubble resin layer on the inside of the pipe, and forming the reinforcing bodies spirally or in ring shape. SOLUTION: A heat insulated duct used as a heat insulated pipe for air conditioner piping is formed by binding and fusing reinforcing bodies 5 in an overlapped part 6 and winding it spirally, using a band body of a fixed width on which a fiber layer, an independent bubble resin layer, and a continuous bubble resin layer are laminated. Also, in a bellows structure, its bottom part form is provided by pressing the part between the reinforcing bodies while they are heated by disk rollers in parallel with the reinforcing bodies. Then the crest part and bottom part of the bellows structure may be the crest part by pushing up the part between the reinforcing bodies from the inner surface of a pipe in parallel to the reinforcing bodies while they are heated by the disk rollers. As a fiber layer, woven or unwoven cloth can be cited. However, unwoven cloth is suitable and, therefore, for example, needle punch unwoven cloth is used. |
