Injection Molding
11 조회수
PMMA Stress Cracking
문제 현상
Products crack during assembly, solvent contact or after storage, often starting from sharp corners and screw bosses.
원인 분석
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.
해결 방법
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.
핵심 요약
PMMA delayed cracking = the delayed detonation of internal stress, annealing is the insurance.
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