Molds & Tooling
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PC barrel zone temperature setting
Fenómeno do problema
Uneven plasticization and cloud patterns on products, or nozzle drooling and cold slug marks on products
Análise das causas
PC has no obvious melting point and high melt viscosity; improper barrel temperature gradient setting causes uneven plasticization; if nozzle temperature is too low, cold material enters the cavity forming cold slug marks and cloud patterns
Solução
①Barrel rear zone 230-250℃, middle zone 250-280℃, front zone 270-310℃ gradient heating; ②Nozzle 260-300℃ slightly lower than the front zone; ③Cold slug well set at the runner end
Conclusão principal
PC requires a progressive temperature gradient to achieve uniform plasticization; nozzle temperature and cold slug well are key details to prevent cold material defects；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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