Meaning
Variation in temperature across the surface or volume of a part during the secondary heating phase. Monitoring the post cure baking thermal differential ensures that internal stresses are relieved uniformly. This measurement identifies cold spots in the oven that could lead to incomplete cross-linking.
Curing Uniformity
Thermal sensors placed at different points on the rack track the heat soak. A high post cure baking thermal differential causes uneven material properties across the batch. Consistency in this phase determines the final hardness of the polymer.
Process Control
Industrial ovens must maintain a tight tolerance to avoid warping the components. Reducing the post cure baking thermal differential involves improving airflow or adjusting the heater placement. A pilot result often looks better than a full production yield due to the mass of the parts.
Stress Relief
Polymers that cool at different rates develop internal fractures. Minimizing the post cure baking thermal differential prevents the part from cracking during later machining steps. Calling a cycle complete based on the air temperature rather than the part temperature is a common error.
Demonstration rates of through-put must account for the required soak time. Correcting the heat distribution improves the reliability of the finished assembly.
