Molds & Tooling
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PPO Hot Runner Adaptation Problems
Problem Phenomenon
[Problem Phenomenon] Alternating gate blockage and stringing in PPO hot runner systems
Cause Analysis
PPO's high viscosity requires high hot runner temperature control accuracy: too low freezes and blocks, too high degrades and strings; gate area temperature gradient design is critical; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Independent closed-loop temperature control for hot runner zones; optimize gate area temperature gradient; regularly clean hot nozzles to prevent degradation accumulation; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hot runner temperature control accuracy determines success or failure for PPO; both blockage and stringing are temperature errors; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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