Material Drying
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PPO Weld Line Bubble Accumulation
Problem Phenomenon
[Problem Phenomenon] Bubbles accumulate at the weld lines of PPO products, with both strength and appearance poor
Cause Analysis
Two melt streams converge and entrain air, and the weld line area has an obvious venting end effect; when moisture is not completely removed, bubbles precipitate along the weld line; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Strengthen venting in the weld line area; ensure drying meets the standard; adjust the gate to change the convergence position to avoid high-stress areas; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO weld line bubbles check venting and drying; the convergence position can be optimized; 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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