Problem:
The surface of the plastic moulding exhibits different levels of gloss even though the mould surface finish is uniform.

Solution:

1. Experiment with increasing the mold temperature.
2. Increase the melt temperature.
3. Increase the hold pressure.
4. Check and optimize hold time.
5. Optimize the point at which the changeover to hold pressure is made:
6. Optimize the injection rate.
7. Improve consistency of the melt by increasing the back pressure and/or screw speed.

 ImtechDesign.com 

Moldflow Consulting