Thermal Gradient Mapping

Process Visualization

High speed thermal sensors and imaging software allow technicians to watch how the melt cools within the steel cavity. Through thermal gradient mapping, the flow of heat can be tracked from the moment the hot polymer enters the cavity until it solidifies. This visualization shows if one region of the tool is retaining heat, which can happen in thick sections or near the gates.

By analyzing these heat maps, operators can adjust the coolant flow rates to achieve a more uniform temperature distribution.

Tool Optimization

Designing efficient cooling channels is critical for reducing cycle times and maintaining part quality in high volume production. Engineers use thermal gradient mapping during the mold trial phase to evaluate the effectiveness of the cooling line layout. If the map reveals a persistent hot spot, the tool can be modified to add conformal cooling channels that follow the contours of the part.

This optimization reduces the cooling phase of the cycle, which increases the output of the molding machine.

Defect Prevention

Uneven cooling within a molded component generates severe internal stresses that lead to warping, sink marks, or dimensional inaccuracies. Applying thermal gradient mapping helps to eliminate these defects before the parts are shipped to the customer. For example, if a flat plastic panel cools faster on one side than the other, it will twist as it shrinks.

By correcting the thermal imbalance identified by the map, the molder ensures the parts remain flat and within the specified dimensional tolerances.