| 摘要 |
PROBLEM TO BE SOLVED: To provide a cardboard duct assembling structure easy to construct and superior in air tightness. SOLUTION: A connection structure is provided for a cardboard duct 1 which is formed by bending a flat cardboard material 1a into a square cylindrical shape, putting opposed side edge portions 1b, 1c on each other with a packing 5 held therebetween and fixing them to each other with a stapler 6. The opening ends of two cardboard ducts 1 are made to abut on each other. To a step portion 2 between the side edge portion 1c located outside and an outer peripheral face 1e of the abutting portion, an auxiliary member 3 having a step covering portion 3b of a thickness 3a almost the same as a drop 2a of the step portion 2 is fixed using a double-side adhesive tape 20, and an aluminum adhesive tape 4 is wound along the abutting portion between the outer face and the opening end to be connected. Thus, two cardboard ducts 1 are connected to each other. COPYRIGHT: (C)2006,JPO&NCIPI
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