Injection Molding
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Glass Fibre severe excessive orientation
Fenómeno del problema
Glass Fibre products have longitudinal-transverse property difference >50%, excessive orientation
Análisis de la causa
injection speed too fast, molecular chains highly oriented in the flow direction; gate design causes unidirectional flow
Solución
1) reduce injection speed to reduce orientation; 2) multi-point gates to reduce unidirectional flow; 3) annealing to partially release orientation
Conclusión clave
excessive orientation is caused by fast unidirectional flow; reducing speed and multi-point gates are key
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