Processing Machinery
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PMMA High Melt Viscosity and Difficult Filling
Fenómeno del problema
Thin-wall transparent parts short shot; raising temperature risks degradation; the process window is hard to grasp.
Análisis de la causa
PMMA melt viscosity is higher than general-purpose plastics, and thin-wall long-flow-path filling resistance is large; raising temperature improves flow but approaches the degradation boundary, so the window is narrow.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solución
①Use higher injection pressure with medium-speed filling; ②take the upper limit of mold temperature to assist flow; ③optimize short-and-thick runner design; ④select high-flow grade.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
PMMA filling relies on pressure and mold temperature compensation rather than simply raising temperature; high-flow grades and runner optimization can fundamentally widen the window.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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