Experimental and simulative investigation of a multistage 2K injection molding process of PA6 and EPDM

For investigations on a two-stage multicomponent injection molding process adhesion-modified polyamide 6 and EPDM with sulfur-curing system are used. The influence of different process temperatures is investigated on the basis of a DoE test plan with 15 factor level combinations. Within the scope of additional, more in-depth investigations, special focus was given to the preheating temperature of the thermoplastic insert. In addition to the experimental work, results from simulations are used to assess the influencing factors. This approach allows a more precise description of the influence of temperature equilibration processes on the crosslinking reaction, especially near the interface between the two components. It is shown that the preheating temperature of the hard component (thermoplastic) in particular has a significant influence on the time course of the crosslinking reaction and ultimately on adhesion to the thermoplastic substrate.