Optimal Process Design of Shrinkage and Welding line Strength in Injection Molding by Taguchi Method

This paper uses the Taguchi method for the optimization of thermoplastic injection molding parameters. This method is useful for studying the interactions between the parameters, and it is also a powerful design of experiments tool, which provides a simple, efficient and systematic approach to determine optimal process parameters. This study specifies eight principal machining parameters namely the mold opening time, mold temperature, melt temperature, filling time, filling pressure, packing time, packing pressure and cooling time. The experimental results were used to obtain the optimum combination of process parameter to give minimum shrinkage and maximum welding line strength.