Injection Molding
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PA6 Injection Product Material Shortage—Venting Type
Fenómeno del problema
Repeated material shortage at fixed positions, and pressure increase was ineffective.
Análisis de la causa
Trapped air back pressure at the last filling point; poor venting; blindly increasing pressure will only produce flash elsewhere; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solución
①Open venting at the material shortage location;②use the short shot method (stepwise filling) to locate the last filling point;③adjust gate position/quantity to change the material flow direction and confluence position;④reduce injection speed at the filling end to leave time for venting;⑤check whether the clamping force is too large and presses closed the vent gaps.
Conclusión clave
PA6 fixed-point material shortage = 'venting': locating with the short shot method and opening venting at fixed points is the radical cure; if trapped air is not removed, the higher the pressure, the more defects; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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