Molds & Tooling
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ABS brittle cracking——too low mold temperature, weak weld line
Problem Phenomenon
The product cracks at the weld line position; the fracture always occurs along the confluence line.
Cause Analysis
When the mold temperature is too low, the melt front cools quickly after entering the cavity, the molecular chains at the confluence of the two melt flows cannot be fully entangled, and the weld line strength is seriously insufficient.
Solution
①Adjust the mold temperature to a reasonable range (generally 40~80℃); ②appropriately increase the mold temperature for thick-wall parts; ③increase the melt temperature and injection speed to keep the confluence at temperature; ④adjust the gate position to avoid the load-bearing area.
Key Takeaway
Weld line strength is guaranteed by temperature; low temperature and fast cooling is an invisible killer.
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