Molding Process
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PMMA Adhesive Selection
Problem Phenomenon
Using the wrong adhesive causes the sheet to crack, or insufficient bonding strength causes debonding
Cause Analysis
Solvent-type and polymer-type adhesives have better adhesion than contact-type adhesives; when internal stress has not been relieved, solvents cause stress cracks; methylene chloride, polymer, and epoxy types are suitable for PMMA
Solution
①Temper at 60-90℃ to relieve stress before bonding; ②select solvent-type or polymer-type special adhesives; ③contact-type adhesives are only used for low-stress temporary fixing; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PMMA bonding, relieve stress before selecting the adhesive; solvent-type gives the best effect, but the premise is proper annealing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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