Injection Molding
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POM Discoloration Systematic Troubleshooting
Problem Phenomenon
Overall discoloration and darkening of parts; repeated temperature adjustments give inconsistent results, unstable between batches
Cause Analysis
POM discoloration is a systemic problem: excessive barrel temperature, high back pressure, fast screw speed, high nozzle temperature, and fast injection speed all stack up shear heat; stagnant material at dead spots is released periodically
Solution
①Systematically reduce barrel temperature, back pressure, and screw speed; ②check dead spots at the nozzle and barrel; ③use small-capacity machines to match small parts; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM discoloration requires systematically lowering temperature, pressure, and speed; single-point adjustments treat symptoms not the root cause—dead spots and small machines are the radical cure; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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