Molds & Tooling
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TPU Weld Line Strength
Problem Phenomenon
Multi-gate products have obvious weld lines and break along the weld lines under stress
Cause Analysis
TPU weld line causes: poor material convergence, air and volatiles mixed in at the convergence point, improper gate position; weld lines affect appearance and even more affect strength; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Increase material and mold temperature to improve convergence; ②Optimize gate position to relocate the weld line; ③Set vent holes or overflow wells at the fusion part; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU weld line treatment prioritizes temperature, relocates position, and assists with venting; stressed areas must avoid weld lines; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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