Abstract
Abstract
Shrinkage is a defect in the form of a change in the dimensions of the product as a result of the injection molding process. Cooling mold is one of the factors that influence shrinkage product defects. Cooling the mold is done using a fluid medium (water cooling). The test was carried out using polypropylene material with constant parameter set-up such as injection time of 2 seconds, injection pressure of 10 MPa, coolant temperature of 22, 24, and 26 °C and melt temperatures of 190, 200 and 210 °C. Simulation uses Ansys transient software using the finite element method to analyze the average temperature in the product cavity. Simulation was using Pepsodent toothbrush products. Simulation result shows the best product quality with a product quality value produces a fill time value of 3.19 seconds with a predictive quality of 68.5% and has a weld line of 0.0115 °, a cooling time of 13.8 seconds and a shrinkage value of 0.008 mm. Simulation results show that the optimal product quality values are found in the set-up parameters of 24 °C coolant temperature, 200 °C melt temperature and 41.3 °C mold temperature. Product quality safety factor indicates that the product is in a good category. This means that the value of product quality is influenced by the mold cooler temperature and along with the increase in the mold temperature, which causes the mold cooling temperature is not constant.