Molds & Tooling
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PPO Gate Stringing
Fenómeno do problema
PPO hot runner gates show stringing and drooling, product gate marks are poor, and automated production is interrupted.
Análise das causas
PPO melt temperature is high and viscosity is large; improper gate temperature control causes stringing; nozzle temperature does not match gate cooling; valve pin action timing is unreasonable.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solução
①Finely control gate temperature; ②nozzle temperature about 10℃ lower than the barrel; ③optimize valve pin timing; ④check hot runner temperature control accuracy.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
PPO hot runner gate management is a test of temperature accuracy; nozzle temperature difference setting is the key point to prevent drooling; valve pin timing needs to be fixed through testing.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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