The Effect of Holding Pressure and Inject Pressure to Short Shot Defect in Injection Molding Cover Pot

Pengaruh Holding Pressure dan Inject Pressure Terhadap Short Shot Defect pada Proses Injection Molding Cover Pot

Abstract

The influence of inappropriate injection molding  parameters often results in product defects, one of  which is the short shot, which is a condition where the plastic to be injected into  the cavity does’t reach the ideal capacity. The purpose of this research is  to understand and be able to explain  the parameters of holding pressure, inject pressure, and the interaction of these two parameters on short shot defects in   cover pot products  with the injection molding process. This research uses independent variables, namely holding pressure with variations of 20 Bar, 30 Bar, and 40 Bar and inject pressure with variations of 15 Bar, 30 Bar, and 45 Bar and dependent variables in the form of short shot defects. The method used in this research is a factorial experiment with replication of 10 (ten) times and data processing analysis using ANOVA with the help of  Minitab 21.2.0 statistical software. The result of this research is that there is a significant influence of holding pressure, inject pressure, and the interaction of these two parameters on short shot defects  in cover pot products  with injection molding process. The average weight of the product produced at the interaction  of the parameters holding pressure 40 Bar and inject pressure 45 Bar is 8.8 grams (normal) so as to minimize product defects to improve the quality and quantity of cosmetic packaging production cover pot.