Injection Molding Material Change with EasyPurge Purging Compound
POM BLACK → PA CLEAR
Goal: Black Specks Removal
Summary:
Machine: 400T
Material: POM Black to PA Clear
Easypurge Purging compound consumed: 6 Sachets (120 Grs)
Time: 15 Minutes
Industry: Automotive
Factory Location: Germany
Scope: Spindle
Findings:
POM has a lower melting point, 180°C (356°F) than the PA, therefore the material degraded when the temperature was increased in the screw in order to reach the melting point of the Polyamide to 280 °C (536 °F).
Degraded POM causes contamination in the spindle generating black specks during production.
Solution:
Bridge material: HDPE
First, The barrel was emptied before the purging process.
At the working temperature of POM, virgin HDPE was used as bridge material to remove the majority of Black POM.
HDPE was used along with the sachets of Easypurge purging compound (without opening) added directly into spindle entrance.
The next step was using more HDPE virgin material to remove the rest of the BLACK POM and black specks.
The machine heat was increased up to the polyamide working temperature.
The following step was purging using polyamide with Easypurge purging compound sachet.
Finally, PA was used to remove the rest of the purging material in order to start production.
Final Results:
Purging Compound Consumed |
Total Purging Time
|
|
EasyPurge Purging Compound |
6 sachets (120Grs) |
15 Minutes |