Molds & Tooling
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PA6 Melt Temperature Too Low Cold Material
Problem Phenomenon
Producing with the melt temperature set at 230°C, the product surface shows cold slug marks and obvious weld lines
Cause Analysis
Below 230°C, PA6 melt viscosity is high and the flow front cools quickly; during filling, the cold material at the front is drawn into the cavity forming cold slug marks, and when two melt fronts converge, insufficient temperature causes weak weld line bonding
Solution
Raise the melt temperature to the 240-270°C range, enlarge the cold slug well volume, and keep the nozzle temperature not lower than the melt temperature; take the upper temperature limit for thin-walled products with long flow paths
Key Takeaway
Melt temperature too low manifests as cold slug marks and weak weld lines, and a reasonable value must be taken within the process window; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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