| 摘要 |
PROBLEM TO BE SOLVED: To provide a tubular body made of synthetic resin which is equipped with internal passages which can reduce a fall in the temperature of molten resin and also make the molten resin flow smoothly on the occasion when half divided bodies are butted in a mold and joined together with the molten resin filled in the internal passages. SOLUTION: A tubular body W made of synthetic resin is divided in the vertical direction in the middle part in the longitudinal direction thereof and in the vicinity of the tube end part of an inlet tube part Wi, while it is divided in the lateral direction in the vicinity of the tube end parts of outlet tube parts No, and a first internal passage Wp1 shaped like a closed section is formed of U-shaped sections combined by mutual butting of two half divided bodies, in the middle part in the longitudinal direction of the tubular body and in the vicinity of the tube end of the inlet tube part, while second internal passages Wp2 shaped like closed sections are formed of virtually-L-shaped sections combined by mutual butting of the two half divided bodies, in the vicinity of the tube ends of the outlet tube parts. The sections of both of these internal passages change gently in the parts of connection thereof and a passage like a closed loop is formed as a whole. |
