Injection Mold Heat Transfer Study with The Carabiner Mold

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Publication Date

Spring 2021


Knowing how heat is displaced throughout an injection mold during plastics processing can allow the plastics processor to ensure the overall process is running at its optimal settings. The mold on which we performed our studies was a carabiner clip mold. Previously, the mold was modified for our lab’s machines. In our study, initially, thermocouples were added to tops and bottoms of the cavity and core halves of the mold. The thermocouples were plugged into a data logging thermometer that allowed for graphing the temperatures of each thermocouple in the mold over a period of time. After the thermocouples were added, preliminary tests were performed to establish processing parameters and to identify a material that was best suited to our application. Four different materials were tested: unfilled nylon, red/gray acrylonitrile-butadiene-styrene (ABS), 18% glass-filled nylon, and polybutylene terephthalate (PBT). Unfilled nylon was identified as the best material for this application. During material testing, our parts were sticking in the cavity side of the mold. For this reason, material was removed along the top edge of the clip to prevent parts from sticking during final testing. Final testing will consist of studying how heat transfers throughout the mold after the mold has been in different environments.


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