Hot Runner Systems

Analysis > Molding > Hot Runner Systems

Introduction

SimLab supports creating a variety of hot and cold runner system setup. Around 35% of the injection molded parts use hot runner systems and SimLab provides all the necessary controls to models these combinations.

Hot and Cold Runner System Differences

IHot
  • Polymer in the hot runner stays in the melt state (as a liquid) throughout the cycle
  • Material in the runner is not ejected
  • Results in saving of material and cycle time
Cold
  • Polymer solidifies during cooling
  • Material in the runner is ejected along with the part
  • Results in material wastage and increase cycle time
  • Mold costs are cheaper

Modeling Hot Runner Systems

Modeling involves

  1. Setting up valve controls
  2. Setting up heater BC

SimLab can also setup models with thermally controlled (open) gate systems.