MULTI-BRANCH TUBE MADE OF RESIN

摘要

PROBLEM TO BE SOLVED: To ensure the mutual joining strength of half split bodies sufficiently without partial nonuniformity and without causing an increase in the use of resin and in filling pressure, on the occasion when molten resin is filled in an internal passage in the part of mutual butting of the half split bodies and the two bodies are joined therewith. SOLUTION: A multi-branch tube made of resin which is obtained by joining of half split bodies WU and WL by butting the half split bodies and also by filling molten resin in an internal passage Wp formed along the peripheral edge of the part of butting. As for the internal passage, the passing sectional area thereof is so set that it becomes larger as it is apart more from a gate part Gp of the passage in the direction of flow of the molten resin. Besides, the internal passage is formed in the shape of a closed section by the wall parts of the half split bodies and the area of contact of the molten resin with the wall part of the passage is so set that it becomes larger as it is apart more from the gate part of the internal passage in the direction of flow of the molten resin.