Molds & Tooling
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Low PC Weld Line Strength
Fenómeno do problema
[Problem Phenomenon] PC multi-gate products have obvious weld lines and crack under stress
Análise das causas
PC's high viscosity causes poor molecular fusion at the converging fronts, and the weld line strength is lower than the body; insufficient temperature and speed make it more obvious; when troubleshooting on site, verify each item according to this mechanism one by one, and avoid blindly adjusting the machine based on experience alone
Solução
Increase the melt temperature, mold temperature and injection speed; move the weld line out of the stressed area; set overflow wells; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate effective measures
Conclusão principal
PC weld line strength is weak; the three moves are raising temperature, raising speed and relocating; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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