Molds & Tooling
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PP Weld Line Low Thermal Conductivity
Problem Phenomenon
【Problem Phenomenon】PP multi-gate products have obvious weld lines and reduced strength
Cause Analysis
PP has low thermal conductivity, the surface freezes first and the inside is slow, the molecules at the confluence front fuse poorly forming weak weld lines; insufficient temperature and speed make it more obvious; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Increase melt temperature, mold temperature and injection speed; set overflow areas; move weld lines out of stressed areas; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP weld lines are due to low thermal conductivity, increase temperature, increase speed and overflow areas; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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