Molds & Tooling
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TPU product cold slug marks
Problem Phenomenon
Cold material marks appear on the product surface.
Cause Analysis
Low nozzle temperature or cold material entering the cavity; the lack of cold slug wells allows cold material to reach the product directly; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①increase nozzle temperature; ②add cold slug wells; ③optimize gate design; ④check nozzle heating; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Cold slug marks rely on cold slug wells for interception; nozzle temperature management is a preventive means; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
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