| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrugated cardboard duct which has high strength, superior airtightness as well and for which positioning and connection at the time of duct assembling work can be easily carried out.SOLUTION: A corrugated cardboard duct 10 is a duct having a shape of square cylinder 10a that is formed of a plurality of corrugated cardboard material of flat-plate. A plurality of corrugated cardboard members (a top plate 1, a bottom plate 2 and side plates 3 and 4) are combined, and side edges 1a, 2a, 3a and 4a, in parallel with a shaft center 10c of the square cylinder 10a, of the corrugated cardboard members (the top plate 1, the bottom plate 2 and the side plates 3 and 4) are connected to each other by a plurality of concave and convex fitting mechanisms M and formed. The side edges 3a and 4a of the side plates 3 and 4 forming a vertical wall surface of the square cylinder 10a are provided with convex parts 3c and 4c of the concave and convex fitting mechanisms M, the side edges 1a and 2a of the top plate 1 and the bottom plate 2 forming a horizontal wall surface of the square cylinder 10a are provided with concave parts 1c and 2c of the concave and convex fitting mechanism M, and an aluminum tape 5 is adhered to each of the connected portions of the side edges 1a, 2a, 3a and 4a. |
