Extrusion & Post
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PMMA Annealing 70-90℃
Problem Phenomenon
Products crack after storage for a period, and cracks break out intensively after bonding or screen printing
Cause Analysis
Internal stress introduced during PMMA molding and processing is released and cracks under the action of solvents, adhesives and inks; annealing relaxes and rearranges molecular chains, eliminating stress without producing silver streaks
Solution
①Anneal in a hot-air circulation oven at 70-90℃ for about 4 hours, adjusted by thickness; ②must anneal before bonding and screen printing; ③cool slowly after annealing; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Annealing is a pre-process for PMMA post-processing; annealing is mandatory before bonding and screen printing, and 70-90℃×4h is the standard combination; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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