Molds & Tooling
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COC Hot Runner Internal Heating Failure
Problem Phenomenon
After COC uses an internally heated hot runner, local overheating degradation yellow spots and cold material blockage alternate, gate area defects occur frequently, and the situation improves after switching to external heating.
Cause Analysis
COC suppliers clearly recommend using only externally heated hot runner systems; the temperature gradient and dead spots of the internal heating structure easily cause local overheating or cold material retention; hot runner temperature control accuracy affects gate stability.
Solution
①Switch to an externally heated hot runner system; ②independent temperature control for hot runner zones; ③regularly clean hot runner dead spots; ④set the gate temperature precisely according to the grade and verify by actual measurement.
Key Takeaway
COC hot runner selection follows the material supplier's recommendation: external heating first; the uncontrollable temperature zone of internal heating is a breeding ground for degradation and blockage; the gate temperature must be actually measured.
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