Injection Molding
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LCP Nozzle Drool and Stringing
Fenómeno do problema
【Problem Phenomenon】Between injection cycles, melt drips and drools from the nozzle tip or strings when the mold opens, contaminating the cavity and forming cold slug marks on the product surface
Análise das causas
LCP melt has extremely low viscosity and excellent fluidity; during downtime or holding gaps, the melt flows out of the nozzle under gravity and residual pressure; the Celanese guide recommends 1.5-2.5mm small-orifice nozzles to suppress drool
Solução
Switch to a 1.5-2.5mm small-orifice nozzle and check that the nozzle heater band controls temperature accurately; add a nozzle shut-off valve or increase the suck-back stroke; appropriately lower the nozzle temperature by 5-10℃
Conclusão principal
Low-viscosity LCP must be paired with a small-orifice nozzle plus suck-back, tackling drool with both measures; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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