Influences of pressures and cycle times on properties of final plastic product from HDPE

Abstract

This paper deals with the possibilities of improving the quality of final product from plastic material. Advanced CAE simulation with finite element method was used as a tool for this research. Main aim of this article is to show procedure how to determine optimal level of injection pressure, packing pressure and times of all injection phases. All these parameters lead to improving of final properties of product. Wide range of values is given for each parameter and it is necessary to determine the suitable value. Exact influences of each parameter on the final product were detected with usage of CAE simulations of injection molding. All these dependencies were in article described. Research was focused on influence of all parameters on final product and also on technological process. Level of mold filling, number and size of weld lines, number of air traps and overall production times were chosen as main parameters for evaluation. Reference part is reinforcement profile from spoiler in racing formula car. Process with mean values of each parameter was chosen as a reference process. Influence were tested on product from high density polyethylene. Material properties for CAE simulation were clearly described in this article. All simulations were validated by experiment performed on real injection molding machine.