Development of Plastic Intake Manifold by DRI Process

We have succeeded in applying a new injection molding method, die rotary injection (DRI), for plastic intake manifold production. Polyamide 6 and polyamide 66 are the optimum materials with consideration of the mechanical properties and the durability against heat and chemicals. Though the conventional plastic manifolds are mostly made by polyamide 66, polyamide 6 showed preferable characteristics for the injection welding technology that we have developed.

Measurement of welding strength and observation of fracture surface were carried out by using specimens that were cut from the real products. High welding strength without delamination of the welding surface was confirmed in the molding condition up to high cylinder temperature and high injection rate.