| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorbing adiabatic duct which is one capable of being made not in a complicated structure but in a simple structure, and which is a duct capable of effecting both actions of a sound absorbing action and an adiabatic action and suitable for being used as a blow duct, and which can be mass-produced, being suitable for continuous production in time of manufacture, and does not need a new facility. SOLUTION: This duct is one constituted of a reinforcing material 1 made of a hard polyolefine resin material, which is wound in a spiral form specified intervals apart, a thick felt layer 2, which is wound in a spiral form with its hems overlapping or abutting on one another on the peripheral face and whose shape is kept with the reinforcing core material 1, a foaming band material layer 3 made of a polyolefine material, which is wound in a spiral form with its hems in abutment or in close contact on its peripheral face, and a resin cover layer 4 which covers the peripheral face. |
