Molds & Tooling
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PPO Weld Line Insufficient Strength
Problem Phenomenon
[Problem Phenomenon] Obvious weld lines on PPO multi-gate products, cracking along the lines under stress
Cause Analysis
When high-viscosity melt fronts converge, the front temperature drops and bonding is weak; low mold temperature and poor venting further weaken weld line strength; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Raise mold temperature to improve weld line strength (effective in the range above 66-93°C); change multiple gates to a single gate or relocate; set overflow wells in the weld line area; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO weld lines rely on mold temperature increase plus structural avoidance, with two prongs working together; 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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