| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect even a resin pipe by using an electromagnetic detector by a method wherein a tape on which an expandable conductive base material and a metal foil are laminated via an adhesive is pasted on the pipe and the pipe is buried. SOLUTION: The average roughness in ten points on at least one face of a conductive base material, i.e., its surface on which a metal foil 2 is laminated is set at 15 to 60μm, and an adhesive 4 which is interposed between the base material and the metal foil 2 is coated in such a way that it is filled into recessed parts 1a on the base material. By this constitution, the adhesive 4 is filled into the recessed parts 1a on the surface of the base material. Thereby, its bonding force to the metal foil 2 is generated, and protruding parts 1b come directly into contact with the metal foil 2 so as to become conductive. The recessed parts 1a and the protruding parts 1b are formed on the rear surface of the base material, the metal foil 2 and a plastic sheet 3 are laminated, the adhesive 4 is filled into the recessed parts 1a, and the protruding parts 1b come into contact with the metal foil 2. When a conductive base material whose surface does not contain uneven parts is used, the adhesive 4 clusters to only one side which is easily bonded to the base material or the metal foil 2. As a result, it is preferable that the density of the protruding parts and the recessed parts on the base material and their height difference are uniform so that a uniform bonding property is revealed on the base material and the metal foil 2 when both are stripped.</p> |
