Extrusion & Post
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PPO Thin-Wall Delamination
Problem Phenomenon
[Problem Phenomenon] Delamination and peeling of PPO thin-walled parts, cracking along the layer plane when bent
Cause Analysis
When mold temperature is below 100°C, thin-walled plastic parts are prone to insufficient filling and delamination; the frozen layer of the melt front bonds poorly with the subsequent melt, forming a weak interlayer interface; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Raise the mold temperature above 100°C to improve thin-wall filling and interlayer bonding; raise melt temperature and injection speed; arrange gates close to thin-wall areas; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO thin-wall delamination is a signal of insufficient mold temperature, with high risk below 100°C; 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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