This article is focused on possibilities of advanced injection molding simulations. Parts made from plastic materials are in almost all technical systems. A lot of various hardly producible plastic parts are used nowadays. Examples are components of electronical systems, mainly various connectors from material polybutylene terephthalate (PBT). These connectors are long in one direction and their geometry is with high number of various small holes. This leads to problems during injection molding. Movement of melted plastic material is slow and also number of weld lines is high. Main aim of this article is comparing of different variants of injection molding process and demonstration of CAE advanced methods usage. This approach leads to optimized production of plastic connectors. During simulation is used accurate material model of PBT which is clearly described. Results leads to mathematical description of dependence between all injection molding parameters and results from this technological process. Mainly are described temperatures and pressures in various moments of injection process. Results of research describe all influences on quality of product. This is done by evaluation of geometrical, optical and mechanical properties of final connector. As an example is used connector with 54 independent contacts. Validation of simulation is performed by comparing with real experiment.

This paper deals with the influence of runner angles on the balanced filling of a three-cavity mould during injection moulding. The main goal of the study is to understand the influence of the angles between the runners and the balanced filling of the three individual parts. Balanced filling leads to better visual and mechanical properties of the final product. Different mould flow simulations with the same processing parameters (material, temperature, pressure and time) were performed to observe the influence of the runner angle. Polypropylene was used as the reference material in this paper. A simple cylindrical part was considered here. In essence, it seems to be a very simple situation, however before running the mould flow simulations there was no general notion of the results and their justification. The paper also raises the possibility for modifying filling behaviour by changing the runner angles and evidence that the configuration with 90 degrees between each runner is the most suitable for achieving the filling of the three parts at the same time.