Injection Molding
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PMMA Overpacking Cracking
Fenómeno del problema
Products crack near the direct gate, and cracking is relieved after reducing injection pressure
Análisis de la causa
Overpacking causes excessive residual stress near the gate; direct gates have the least pressure loss but the most concentrated stress, and switching to pin gates or side gates can disperse stress; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①For cracking near direct gates, switch to pin gates or side gates; ②raise material temperature to reduce viscosity and injection pressure; ③shorten injection and holding time or use two-stage holding; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PMMA gate area cracking is the signature of overpacking; changing gate type plus reducing pressure is a combination punch; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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