Method of bonding and molding modified polytetrafluoroethylene moldings

A method of joining molding the modified polytetrafluoroethylene molded article, the at least one surface of the modified PTFE to be bonded to each other forming member disposed along the inner wall surface or arranged near the inner wall surface of the molding die, so that shaped molding die disposed portion is rotated in at least one axis, while the forming member is heated to a temperature above the melting point of modified polytetrafluoroethylene, so that the engagement member formed on the joint surface thereof and integrally molded at the same time the outer surface of the member into the shape of the inner wall surface of the mold as the molding. With this method, for producing modified polytetrafluoroethylene molded article having a smooth stepless inner surface or irregularities.