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Main aim of this article is description of weld line influence on mechanical properties of plastic parts. Special design of mold was created for this research. This mold is able to create specimens with and without weld lines. These specimens undergone tensile test according standard ASTM D638 with different results. Strength and strain results were compared for both types of specimens. Nylon PA6 without any internal reinforcement was used as reference material during testing. Both specimens were investigated also by microscope in order to see composition of weld line and plastic material. Microstructure showed geometry of weld line and also fracture surfaces indicated presence of plastic deformation

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.