Injection Molding
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PVC Weld Line and Flow Mark
Problem Phenomenon
Weld lines and flow marks on products were obvious; raising temperature gave limited improvement and approached degradation
Cause Analysis
When PVC melt temperature is low, poor front convergence forms weld lines; but temperature-raising room is limited by degradation, so it mainly relies on injection speed and gate position optimization; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Adjust injection speed to improve front convergence; ②optimize gate position to adjust weld line position; ③moderately raise mold temperature when necessary; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PVC weld line treatment mainly relies on speed and position; use temperature means cautiously and strictly prevent crossing into degradation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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