Processing Machinery
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PP Black Speck Thermal Decomposition
Problem Phenomenon
PP black specks from thermal decomposition, melt over 300°C or residence too long, temperature management.
Cause Analysis
PP black specks from thermal decomposition; melt temperature over 300°C; residence time too long; screw wear; incomplete purging; material degradation.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Melt temperature ≤300°C; ②shorten residence time; ③screw inspection; ④purging specifications; ⑤degradation monitoring.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Temperature and residence are the main causes of PP black specks; equipment and purging are equally important; monitoring prevents degradation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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