The subject plastic part is a high precision infrared thermometer with well-organized PCB and probes in the enclosures.
It was a challenge for us at that time since our client requested that enclosures should stand an oriented drop test from 1m above the ground. Moreover, the enclosure should be tough enough to resist high temperature (70℃).
If we used PPS as the raw material, the thermometer’s precision of measuring temperature will be easily affected by users’ hand temperature when holding in hand. While different kinds of plastic has different specific heat ratio, distortion temperature and thermal conductivity, we carefully studied on all available materials and selected PPU.
In the injection process, we designed high precision mold with reasonable structure. The enclosure couldn’t be designed too thick (which will increase the weight) nor too thin (which will influence precision). We made hundreds of trial runs to test out the most suitable thickness.
Finally we presented the satisfying thermometer enclosures with the help of our well designed mold and sophisticated injection techniques and machines.