Mold-Masters Hot Runner - Discolored Parts

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20.6.7 Discolored Parts

The nished product varies in color on di󰀨erent surfaces.

Probable Cause:

1. Molding Machine

• Contamination

2. Mold

• Incorrect sprue diameter

• Inadequate venting

3. Material

• Physical contamination of raw material

• Chemical contamination of raw material

• Melt too hot / poor melt

• Incompatible color dye

• Residence time too high

Solution (in sequence):

1. Purge heating cylinder

2. Lower resin temperature by:

• reducing cylinder temperature

• reducing screw speed

• reducing back pressure

3. Decrease nozzle temperature

4. Adjust residence time

5. Adjust regrind ratio

6. Adjust cycle time

7. Check for external contamination sources

8. Ensure proper cooling in all areas

9. Increase mold venting

20-11TROUBLESHOOTING

Hot Runner User Manual

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