Molds & Tooling
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PPO Cold Slug Marks
Problem Phenomenon
[Problem Phenomenon] Cold slug marks on PPO product surface, irregular front-section filling
Cause Analysis
Low nozzle temperature or insufficient cold slug well causes front cold material to enter the cavity; cold material of high-viscosity materials is harder to fuse; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Match nozzle temperature to the front section; enlarge the cold slug well to accommodate front cold material; increase injection speed to reduce front cooling; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO cold slug marks check nozzle temperature and cold slug well capacity; 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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