Molds & Tooling
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PBT Dark Weld Line
Problem Phenomenon
Dark weld lines appear at the weld of the product, with insufficient strength and poor appearance
Cause Analysis
When PBT melt fronts meet, the temperature drops, and the glass fiber orientation at the weld line is unfavorable; improper gate position makes the weld line fall in the stress-bearing area; increasing temperature and speed can improve it
Solution
①Increase resin temperature and injection speed; ②Change the gate position to move the weld line; ③Set an overflow well at the weld line; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT dark weld line treatment gives priority to temperature and speed; position transfer and overflow wells are mold-side countermeasures; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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