Abstract: The present invention provides a fitting mechanism capable of distributing pressure applied on an outermost layer of plastic, and contributing to cooperation and complementary reaction between a fitting body and a ferrule body under severe temperature change. A fitting mechanism according to the present invention comprises a fitting body formed of metal, and a ferrule body formed of metal, wherein the fitting body is coupled to the ferrule body by fastening the third threaded portion of the ferrule body with the second threaded portion of the fitting body, and the fitting body slope surface is impinged onto the ferrule body slope surface forming a fluid tight contact and causing the ferrule body deformation portion to be deflected inwardly, tightened around and penetrate into outermost layer of plastic, and the outermost layer of plastic of the leading end of the multilayer composite pipe impinges onto coupling end portion.

Abstract: The present invention provides a fitting mechanism capable of distributing pressure applied on an outermost layer of plastic, and contributing to cooperation and complementary reaction between a fitting body and a ferrule body under severe temperature change. A fitting mechanism according to the present invention comprises a fitting body formed of metal, and a ferrule body formed of metal, wherein the fitting body is coupled to the ferrule body by fastening the third threaded portion of the ferrule body with the second threaded portion of the fitting body, and the fitting body slope surface is impinged onto the ferrule body slope surface forming a fluid tight contact and causing the ferrule body deformation portion to be deflected inwardly, tightened around and penetrate into outermost layer of plastic, and the outermost layer of plastic of the leading end of the multilayer composite pipe impinges onto coupling end portion.

Abstract: The present invention relates to a pipe connection device and a pipe connection method, wherein binding force is maintained by a polymer bonder for coupling with a metal material through ion substitution by moltenization between a fitting cover through hole of both ends of a metal material and a coupling pipe. Therefore, a connection of metallic pipes and a mutual coupling construction of plastic composite pipes can be readily carried out by using the polymer bonder which has a low cost and is coupled with the metal material through ion substitution. Additionally, a use under a high pressure condition is possible.

Abstract: The present disclosure relates to a composite pipe having improved bonding strength between heterogeneous materials, which provides continuous bonding strength by chemical bond between heterogeneous materials, thereby preventing separation between the heterogeneous materials even at a high temperature and a high pressure, so as to replace a metal-based pipe used in fields of industry demanding heat resistance and chemical resistance, and an apparatus and a method of manufacturing the composite pipe. Accordingly, strong bonding strength according to chemical bond in the unit of nano between the heterogeneous materials is achieved, so that separation between the heterogeneous materials is not generated even at a high temperature and a high pressure, thereby being capable of further expanding the applicable fields of industry.