| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat insulating pipe lightening weight, having both good heat insulation and sound absorptivity, reducing fluid resistance of a duct, decreasing a work amount in a jobsite, having easily supporting rigidity and with economical efficiency. SOLUTION: A heat insulating pipe 10 is constituted by an inner pipe 12 comprising foaming material layers 16, 18 and a ventilating film layer 20 layered inside the foaming material layer and an outer pipe 14 provided in the outside of the inner pipe to have rigidity larger than its rigidity to be formed by a flexible corrugated pipe unit having an internal wall surface alternately protruding/hollowing in a direction crossing with an axial core. The foaming material layer of the inner pipe respectively has an independent bubble foaming material layer 16 having a continuous bubble foaming material layer 18 in the inside and elasticity in the outside. The independent bubble foaming material layer, by its elasticity, is advanced into a recessed part of the outer pipe internal wall surface, in this way, the inner/outer pipe is mutually engaged, integrality of a heat insulating pipe is ensured.</p> |
