| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating forming method for a coated metal pipe capable of generally simplifying an extrusion coating device, capable of increasing a manufacturing speed, capable of easily performing coating processing in the whole of a coating forming apparatus to generally make a product cost relatively inexpensive and enhancing the adhesion and bonding strength of the coating layer on the surface of a metal pipe to eliminate the occurrence of fear of peeling, and the coating forming apparatus therefor. SOLUTION: At least a single resin layer is applied to the outer peripheral surface of the metal pipe by extrusion using a series of devices, which are composed of a feed roll device, at least one extrusion supply unit high frequency induction heating device connected to the die main body constituting the extrusion coating device, a press roll device, a cooler and a cutter all of which are successively arranged in the moving direction of the metal pipe of which the outer peripheral surface is preliminarily subjected to plating treatment, while moving the metal pipe in one direction. Further, the metal pipe is instantaneously heated to the melting temperature of the resin layer or above in cooperation with the movement of the metal pipe and the resin layer is pressed and closely bonded to the metal pipe as rapidly as possible before cooled and solidified. COPYRIGHT: (C)2005,JPO&NCIPI |
