Based on the previous focus on the exponential impact of hot runner temperature on melt viscosity and the background of adapting temperature settings to different plastic properties, excessively high hot runner temperatures can lead to multiple adverse consequences:
Material Performance Degradation: Prolonged exposure to excessive temperatures can cause thermal degradation of the melt, resulting in molecular chain breakage. This leads to silver streaks and scorch marks on the surface of the molded parts, a significant decrease in mechanical strength, and even localized cracking and scrapping.
Increased Molding Defects: Low melt viscosity can cause flash and burrs, abnormally high cooling shrinkage, and a significantly increased probability of warping, deformation, and dimensional errors in the molded parts.
Equipment Lifespan Loss: Long-term operation at excessively high temperatures accelerates the aging of hot runner heating elements and seals, significantly shortening equipment lifespan and potentially causing localized overheating and burn-out.
Reduced Production Efficiency: Excessively high temperatures prolong melt cooling time, forcing a longer overall molding cycle and increasing energy consumption, directly reducing mass production efficiency. These consequences can directly lead to a significant drop in injection molding yield, and in severe cases, can even result in mass scrapping.
