Hollow body i.e. cooling water circulation pipe, manufacturing method for heat engine of motor vehicle, involves ejecting rigid profile outside mold by forming single piece i.e. pipe, with over molded hollow volume

摘要

The method involves positioning a rigid profile i.e. U-shaped inner tube (1), in a mold (2), and injecting a thermoplastic material i.e. low viscosity polymer, by a water or gas injection method in a cavity of mold around the profile through a polymer injection channel (4). The profile is ejected outside the mold by forming a single piece i.e. fluid circulation pipe (3), with an over molded hollow volume (3a). Heat exchange is realized with the rigid profile across a contact surface on the profile. An independent claim is also included for a fluid circulation pipe comprising an inlet branch connection.