Interface and encapsulation in simulataneous co-injection molding of disk: two-dimensional simulation and experiment

摘要

A two-dimensional simulation and experimental study of the flow-rate controlled co-injection molding was carried out. A skin polymer was injected first and then both skin and core polymers were injected simultaneously into a center-gated disk cavity through a two-channel nozzle to obtain an encapsulated sandwich structure. The physical modelling and simulation were developed based on the Hele-Shaw approximation and kinematics of interface to describe the two-phase flow and the interface development. The effects of rheological properties and processing conditions on the material distribution, penetration behavior and breakthrough phenomena were investigated. The predicted and measured results were found to be in good agreement with each other.