Processing Machinery
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PPO Internal Voids
Problem Phenomenon
[Problem Phenomenon] Internal voids in thick-walled PPO products, detected by X-ray or sectioning
Cause Analysis
In thick-walled areas, the outside solidifies first and the internal shrinkage has no material to compensate, forming vacuum voids; insufficient holding compensation and excessive wall thickness act together; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Uniform wall thickness design to reduce material; staged holding pressure to extend compensation; strengthen core cooling of thick-walled parts to guide directional solidification; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PPO voids are a cut-off of compensation supply, and wall thickness uniformity comes before holding pressure adjustment; 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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