METHOD OF FORMING FLUORORESIN COATING FILM ON INNER PERIPHERAL SURFACE OF CYLINDRICAL PIPE AND CYLINDRICAL PIPE HAVING FLUORORESIN COATING FILM ON INNER PERIPHERAL SURFACE OBTAINED BY THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method of forming a fluororesin coating film, in which the fluororesin coating film is uniformly and easily formed on the inner peripheral surface of cylindrical pipes respectively having various diameter, and the rotation of the cylindrical pipe to be film-formed is made unnecessary, and to provide the cylindrical pipe coated with the fluororesin coating film obtained by the method.;SOLUTION: In the method of forming the fluororesin coating film on the inner peripheral surface of the cylindrical pipe, a thermal expansion tube comprising the fluororesin is inserted into the cylindrical pipe so that both ends are projected from the cylindrical pipe, both ends of the cylindrical pipe into which the thermal expansion tube is inserted are covered with a covering body and heated at a temperature below the melting temperature, and after cooling, the covering body is removed and further heating is performed at a temperature equal to or higher than the melting point, so that the tube is fusion-fixed on the inner peripheral surface of the cylindrical pipe to form the coating film.;COPYRIGHT: (C)2011,JPO&INPIT