Material Drying
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PP Silver Streak Drying Misjudgment
Problem Phenomenon
PP silver streaks still appear after drying verification, equipment or process factors troubleshooting.
Cause Analysis
PP silver streaks still appear after sufficient drying; nozzle heater leakage; excessive back pressure; screw wear; excessive residence time; equipment inspection omissions.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Drying verification confirmation; ②nozzle heater inspection; ③back pressure reduction; ④screw wear inspection; ⑤residence time management.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Post-drying equipment troubleshooting of PP silver streaks is deep diagnosis; nozzle and back pressure are common omissions; systematic adjustment.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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