Troubleshooting Defects - Part II Hot-Runner Long Gate Vestiges

摘要

Most hot-runner manufacturers use mathematical formulas to calculate theoretical thermal expansion of valve pins and related tooling and plates. Length of the valve pin relates to preload on the gate insert: No preload will cause long gates; too much will fracture the gate. If the correct length of the valve pin is in question, and specific print dimensions are not available or trustworthy, use a more direct method, as shown in the accompanying diagram.