Optimization of Process Parameters for Vertical-Faced Polypropylene Bottle Injection Molding

Youmin Wang,Xuejun Shan,Zhichao Yan

doi:10.1155/2018/2635084

Abstract

In order to obtain the optimal combination of process parameters for vertical-faced polypropylene bottle injection molding, with UG, the model of the bottle was drawn, and then, one module and sixteen-cavity injection molding system was established and analyzed using Moldflow. For filling and maintaining pressure during the process of infusion bottle injection molding, the orthogonal test table L25 (56) using CAE was designed for injection molding of the bottle, with six parameters such as melt temperature, mold temperature, injection pressure, injection time, dwell pressure, and dwell time as orthogonal test factors. By finding the best combination of process parameters, the orthogonal experiment was completed, the results were analyzed by range analysis, and the order of influence of each process parameter on each direction of optimization was obtained. The prediction dates of the infusion bottle were gained under various parameters, a comprehensive quality evaluation index of the bottle was formulated, and the multiobjective optimization problem of injection molding process was transformed into a single-objective optimization problem by the integrated weighted score method. The bottle parameters were optimized by analyzing the range date of the weighted scoring method, and the best parameter combination such as melt temperature 200°C, mold temperature 80°C, injection pressure 40 MPa, injection time 2.1 S, dwell pressure 40 MPa, and dwell time 40 S was gained.

Highlights

Polypropylene infusion bottles are currently widely used to hold medical liquids since they have advantages such as better sealing properties, lighter weight, better heat resistance, easy to transport and preserve, and so on
Verticalfaced polypropylene bottles are the preforms used for blow molding, which are mainly produced and processed by injection molding process
E best combination of process parameter for infusion preform injection of the infusion bottle can be obtained through the orthogonal experiment method, and the injection molding process of the bottle was simulated by using Moldflow to obtain the best combination of process parameters

Summary

Introduction

Polypropylene infusion bottles are currently widely used to hold medical liquids since they have advantages such as better sealing properties, lighter weight, better heat resistance, easy to transport and preserve, and so on. E best combination of process parameter for infusion preform injection of the infusion bottle can be obtained through the orthogonal experiment method, and the injection molding process of the bottle was simulated by using Moldflow to obtain the best combination of process parameters. Zili et al [3] applied the orthogonal algorithm to the injection molding process parameter design, selected the parameters for the green performance index, and proved the feasibility of this method as an example but did not indicate how to optimize the parameters. E. Advances in Materials Science and Engineering optimization of injection molding process parameters of vertical polypropylene preforms was studied, the optimal combination of process parameters was determined after the optimization of each evaluation index, and the injection molding process parameters of synthetic weighted method were simulated and verified

Infusion Bottle Injection Mold Structure Design

Orthogonal Experiment

Optimization of Injection Molding Parameters of Infusion Bottle

Simulation Verification

Findings

Conclusions