Injection Molding
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PLA Injection Mold Design
Fenómeno del problema
PLA products have special shrinkage behavior in the mold, and dimensions are out of tolerance when designed per general plastics
Análisis de la causa
PLA shrinkage rate is about 0.3-0.6%, relatively low, but the crystallization degree affects the actual shrinkage; the mold allowance is per grade data; fast cooling causes low crystallization, slow cooling causes high crystallization and large shrinkage
Solución
①Mold allowance per grade shrinkage data; ②Crystallization strategy linked with shrinkage calculation; ③Correct after mold trial; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PLA mold allowance must be linked with the crystallization strategy; corrected per crystallinity on the 0.3-0.6% baseline; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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