Study on Simulation of Injection Process and Optimization of Process Parameters of Polypropylene Bottle Embryo

Abstract

The purpose of this paper is to obtain the best process parameters of polypropylene bottle injection molding. This paper obtained the gating system of polypropylene bottle embryo by using MOLDFLOW according to the structural characteristics of polypropylene bottle embryo, and optimized the process parameters by using taguchi method within the reasonable range of process parameters. In this paper, six parameters about time, pressure and temperature were selected as factors for the mold flow analysis of polypropylene bottle embryo injection molding, and there were four levels in every factor. The volume shrinkage, sink index and residual stress in the first and second directions in the cavity were selected as evaluation indexes. In order to reduce evaluation indexes, the signal to noise ratio of each factor and each level were calculated, and the adjustable factors were adjusted to obtain the minimum evaluation indexes and optimal combination of process parameters. The optimum process parameters such as melt temperature 200°C, molding temperature 20°C, injection pressure 50Mpa, injection time 2.1s,dwell pressure 44Mpa, dwell time 40s were gained.