Injection Molding
13 مشاهدة
PMMA Stress Cracking
ظاهرة المشكلة
Products crack during assembly, solvent contact or after storage, often starting from sharp corners and screw bosses.
تحليل الأسباب
PMMA is brittle and sensitive to residual stress; high stress from fast injection, cold demolding, sharp corners and press fits cracks under solvent or load.
الحل
①Slow injection; ②Sufficient cooling and gentle demolding; ③Change sharp corners to rounds (25%~60% of wall thickness); ④Anneal at 70~80℃ for 2~4 hours; ⑤Avoid contact with incompatible solvents.
الخلاصة الأساسية
PMMA delayed cracking = the delayed detonation of internal stress, annealing is the insurance.
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