Extrusion & Post
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PMMA Solvent Stress Cracking
Problem Phenomenon
Products craze after contact with alcohol cleaners, and silver-thread-like cracks erupt after screen printing paint filling
Cause Analysis
PMMA does not resist ketones, alcohols, esters, aromatic hydrocarbons, and chlorinated hydrocarbons; solvents penetrate the surface layer and weaken intermolecular forces, and release instantly under the inducement of residual stress to form crazing; recycled material sheets are more soluble and more prone to cracking
Solution
①Prohibit contact with ketone, alcohol, and ester solvents; ②choose acrylic or amino paints for screen printing paint filling; ③prohibit solvent-based processing of recycled material sheets; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA solvent cracking is the superposition of stress and chemistry; chemical list control and sheet material source control run in parallel; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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