Molds & Tooling
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TPU flow marks
Problem Phenomenon
Corrugated flow marks appear on the product surface.
Cause Analysis
Unstable filling causes front temperature fluctuations; uneven mold temperature also aggravates flow marks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
①optimize the injection speed profile for smooth filling; ②increase and uniformize mold temperature; ③appropriately increase melt temperature; ④enlarge the gate; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU flow marks are improved by smooth filling and uniform mold temperature; speed profile optimization is the main means; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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