Injection Molding 3 views

Glass Fibre severe excessive orientation

Problem Phenomenon

Glass Fibre products have longitudinal-transverse property difference >50%, excessive orientation

Cause Analysis

injection speed too fast, molecular chains highly oriented in the flow direction; gate design causes unidirectional flow

Solution

1) reduce injection speed to reduce orientation; 2) multi-point gates to reduce unidirectional flow; 3) annealing to partially release orientation

Key Takeaway

excessive orientation is caused by fast unidirectional flow; reducing speed and multi-point gates are key

Glass Fibre excessive orientation injection speed multi-point gate property difference

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