Black Regrind PP → White PP
Colour Change and Carbon Removal
on 1300 Tonnes MAICO
Carbon visible in Poly Clear 100 purge
–
Stripes shown from mixing nozzle
BBU bringing out carbon contamination
65 kg of BBU (left and central)
First Purge of Natural PP (Right)
1st shot (Top Left)
2nd an 3rd shot (Bottom Left)
Total: 3 scrap (Right)
45 minutes purging + 20 minutes moulding 8 shots:
2 scrap parts for colour from the hot sprue bush
Results
Normal results:
- 6 hours total
- Purge 100 kg of PC/PP GF
- Nozzle pull and clean
- 4 hours moulding (360 kg)
- 20 years since last screw clean
Aquapurge results:
- 45 minutes purging
- 15 kg Poly Clear 100
- 65 kg BBU (first deep clean)
- 2 scrap mouldings
One Year On:
- 15 kg Poly Clear 100
- BBU once/year
- 10 minutes change
