Extrusion & Post
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PMMA Surface Hardening
Problem Phenomenon
Acrylic panels show increasing scratches during use, and transparency decreases due to wear
Cause Analysis
PMMA surface hardness is only 2H level and is easily scratched; chemical coating hardening treatment can raise the hardness to 4-8H and is widely used for optical lenses and electronic panels; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Apply hardening coating treatment to parts with wear-resistance requirements; ②thoroughly clean and polish the surface before hardening; ③cover with protective film throughout handling and processing; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA's scratch-resistance shortcoming is made up for by hardening coating; the improvement from 2H to 4-8H is standard treatment for panels; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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