Molds & Tooling
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PMMA Regrind Silver Streak Cracks
Fenómeno do problema
Fine silver streaks appear on the product surface after using regrind; after engraving and paint filling, cracks propagate along the paint-filled area.
Análise das causas
Regrind has low molecular weight and long heat history, and is more easily attacked by solvents; organic solvents in the filling paint penetrate the regrind sheet surface and induce silver-streak-like cracks.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solução
①Select acrylic resin pigments to replace solvent-based ones; ②polish after paint filling; ③control regrind ratio; ④use virgin material for critical products.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusão principal
The solvent resistance of regrind PMMA decreases significantly; low-aggression materials should be selected for painting and filling processes, and regrind should be used cautiously for products with high appearance requirements.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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