Molding Process
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PMMA Bonding Bubbles and Whitening
Problem Phenomenon
Bubbles and whitening appear on the bonding surface, bonding strength is insufficient, and appearance is poor
Cause Analysis
Grease and dust prevent uniform application of the adhesive and leave bubbles; direct blowing causes the adhesive to volatilize quickly, leading to whitening; ambient temperature and humidity and sheet stress also affect bonding
Solution
①Thoroughly clean the bonding surface before bonding; ②preheat the sheet to 30-40℃ before bonding; ③post-cure at a constant 60℃ for 2 hours after bonding to relieve stress; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA bonding is a three-step process of cleaning, preheating, and post-curing; each step directly affects bubbles and whitening; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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