Processing Machinery
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TPU weld line low strength
Problem Phenomenon
The tear strength at the weld line is significantly lower than the body.
Cause Analysis
The front temperature of the two melt flows is low and fusion is poor; the weld line of TPU elastomer is itself a weak point of strength; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①increase melt and mold temperature; ②optimize gate position to avoid stressed areas; ③set overflow wells at the convergence; ④increase the convergence speed; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU weld lines are difficult to completely eliminate; design avoidance of stressed areas is more reliable than process remedies; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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