METHOD FOR CALCULATING THE SCORCH-INDEX I N COLD RUNNER SYSTEMS

For a safe thermal and rheological layout of cold runner systems for r ubber injection moulding, technical support for the design is required . Especially the layout against crosslinking of the material in the ru nner system is very important in this case. This paper contains simula tion calculations for the crosslinking state of the elastomer material in in the runner. Based on the results of these calculations, a model supported design method for the scorch index in cold runner systems h as been developed. Possibilities for optimizing the thermal separation between the hot mould and the cold nozzle are explained as well. Thes e methods developed, simplify the design of cold runner systems even f or smaller companies who don't use FEM programs.