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Hot Runners 24 MoldMaking Technology April 2015 By Bill Rousseau Hot runner valve gate actuators with position sensors allow for continu- ous feedback of pin position. When combined with advanced valve gate control systems, the pin movement can be precisely controlled to improve cosmetics, resolve balance issues or manipulate the flling of the cavities. T here have been a number of advances in hot runner systems and cavity sensors through the years that individually have provided molders with increased pro- ductivity and new capabilities, but if combined, they have the potential to bring even more benefits and capabilities. Let's take a look at each technology separately and then review the power of the two combined. Cavity Melt Sensor Technology The manner in which a mold cavity fills will have a huge impact on the quality of the injection-molded part. Even slight changes to timing, temperature and pressure as the polymer Combining cavity sensors with hot runner valve gate control yields new applications and greater process gains. SMART Tooling