| 摘要 |
PURPOSE:To attain a cylindrical radio wave reflecting tube having a radio wave reflectance performance which is kept for a long period by laminating sequentially an olefinic polymer layer and at least a kind of forming material selected among an olefinic polymer layer, a metallic mat, cloth and net. CONSTITUTION:The thickness of the olefinic polymer layer being an inner layer is 5mu-5mm., the metallic forming material being an intermediate layer is finner than 2 meshes and the olefinic polymer layer being an outer layer is 0.5mm.-15mm.. As the olefinic polymer (inner layer 1 and outer layer 3), an ethylene homopolymer, a propylene homopolymer, an ethylene and propylene copolymer, and a copolymer of an ethylene and/or propylene and other alpha-olefin having the carbon number of at least 12 (the rate of the polymerization of alpha-olefin is at most 20wt%) is selected. As a typical example of the metallic forming material 2, a metal simple substance such as aluminum, iron, nickel, copper or zinc, or an alloy having any of those metals as a major content (e.g., stainless steel or brass) is used. |
