| 摘要 |
PURPOSE:To form a lining, having high heat resisting and adhesive properties, without the use of a solvent, by a method wherein an adhesive layer, such as polyolefin containing a carboxylic acid group, is formed on an outer periphery of an expansive synthetic resin tube through the medium of a specified intermediate layer, and after the work is inserted into a metal tube, the diameter thereof is expanded by heating. CONSTITUTION:A block copolymer of styrenebutadien in a fusing state is extruded through a toroidal die with the insertion of a thermal expansive synthetic resin tube, i.e., a thermal expansive polyvinyl chloride, tube, into an extruder, and the outer periphery of the tube is covered with an intermediate layer. An adhesive, comprising mainly polyolefin, i.e., ionomer resin, containing carboxylic acid or an anhydride group in a molecule, is extruded in a fusing state through the toroidal die to cover the surface of the intermediate layer with an adhesive layer. The synthetic resin is further inserted into a metallic tube, and the diameter thereof is enlarged by heating. This causes forming of a lining layer on the inner surface of the metal tube. |
