Molds & Tooling
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TPE Burnt
Problem Phenomenon
Local black spots or yellow streaks appear on products.
Cause Analysis
Material temperature too high, residence time too long or poor venting; local plastic overheats and carbonizes.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
①Reduce barrel temperature; ②shorten melt residence time; ③clean vent grooves to improve venting; ④reduce injection speed.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Burning is a signal of overheating and trapped air; troubleshoot from the three aspects of temperature, residence time and venting.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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