Meaning
Physical constants measuring the ability of a material to transfer heat define the rate of cooling and heating in manufacturing. In the processing of polymers and metals, thermal conductivity dictates how fast the core of a part can be cooled to reach a solid state. It is the limiting factor for the speed of many production cycles where thick sections are involved.
Heat Flux
The movement of energy through the bulk of a substance depends on the temperature gradient and the nature of the material. A low thermal conductivity means that heat stays trapped inside the part, which can lead to warping or internal voids. This property determines the placement of cooling channels in a mold or the length of a water bath in an extrusion line.
Cycle Time
Production efficiency is often tied to the time required for a product to reach a temperature where it can be handled. Because plastics have a very low thermal conductivity, they take a long time to cool compared to metals. Reducing this time requires a balance between the part thickness and the cooling capacity of the equipment.
Efficiency Gain
Using additives or fillers can sometimes alter the way a material handles heat. Improving the thermal conductivity of a resin allows for faster production rates and more uniform part quality. While the base material might have a fixed rate, the overall system capability can be enhanced by optimizing the thermal management strategy.