Injection Molding
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Weight fluctuation of PP products
Fenómeno del problema
The product weight is unstable during continuous production.
Análisis de la causa
Injection metering fluctuation, backflow from non-return ring wear, or unstable melt temperature all cause weight fluctuation.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solución
①Disassemble and inspect the non-return ring; ②stabilize the melt temperature; ③check the metering repeatability; ④establish weight SPC monitoring.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Conclusión clave
Weight fluctuation is a comprehensive signal of equipment and process stability; SPC monitoring can give early warning.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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