Problem:
From the gate point, the surface of the plastic moulding exhibits a snaking, often rough or matt strand of polymer melt.

Solution:

1. Reduce the speed of injection.
2. incorporate an obsticle in front of the gate like a pin.
3. Enlarge the gate to reduce shear.
4. Move the gate to an adjacent area.

 ImtechDesign.com 

Moldflow Consulting