Injection Molding
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EMA Injection Gate Freezes Too Early
Fenómeno del problema
The gate of EMA injection molded products freezes within 0.5-1s during the holding stage, holding pressure cannot be transmitted, product shrinkage severe
Análisis de la causa
Gate size too small, diameter <1mm, causing rapid freezing; injection temperature low; mold temperature low, accelerating gate cooling
Solución
1) Increase gate diameter to 1.5-2mm; 2) Increase injection temperature to 160-210°C; 3) Increase mold temperature to 40-50°C to delay gate freezing; 4) Holding pressure decays in steps rather than sudden release
Conclusión clave
Premature gate freezing is caused by small gate and low temperature; enlarging the gate and increasing temperature are fundamental measures
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