Material Drying
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PMMA Bubbles and Vacuum Voids Identification
Problem Phenomenon
Internal voids recur in products, and drying and holding pressure adjustments give inconsistent results.
Cause Analysis
Water vapor bubbles are mostly accompanied by silver streaks and scattered in position, while vacuum voids are centered in thick areas; confusing the two types of voids leads to counterproductive countermeasures.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Identify the type by position and accompanying features; ②strengthen drying for water vapor bubbles; ③strengthen holding pressure and structural design for vacuum voids; ④section for verification.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Void identification is a basic skill of PMMA defect analysis; qualitative identification before quantitative adjustment can avoid repeated trial and error.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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