HEAT INSULATING PIPE

摘要

PROBLEM TO BE SOLVED: To provide a heat insulating pipe having a heat insulating part and a conduit part integrally formed so as to dispense with separate formation of the heat insulating part. SOLUTION: A conduit part 3 is formed at the center part of a heat insulating pipe 1. The conduit part 3 is formed of polypropylene, and its sectional form is circular. A heat insulating part 5 is formed around the conduit part 3. The heat insulating part 5 has a shell 7 and a connecting part 9 connecting the internal wall of the shell 7 and the external wall of the conduit part 3, and parts other than the shell 7 and the connecting part 9 are space parts 11. The heat insulting pipe 1 has the same sectional form in any longitudinal position. The shell 7 and connecting part 9 are formed of the same material as the conduit part 3, that is, polypropylene, and the conduit part 3, shell 7 and connecting part 9 are simultaneously formed by extrusion molding.