Injection Molding: Material Change with EasyPurge Purging Compound
Injection Molding Material Change: 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
Injection Molding Material Change: 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.
![](https://easypurgeapc.com/wp-content/uploads/2020/01/HDV_0070.MP4.00_00_54_06.Still001.jpg)
At the working temperature of POM, virgin HDPE was used as bridge material to remove the majority of Black POM.
![](https://easypurgeapc.com/wp-content/uploads/2020/01/HDV_0072.MP4.00_00_19_17.Still001.jpg)
HDPE was used along with the sachets of Easypurge purging compound (without opening) added directly into spindle entrance.
![](https://easypurgeapc.com/wp-content/uploads/2020/01/Easy-Purge-Sachets_Moment1.jpg)
The next step was using more HDPE virgin material to remove the rest of the BLACK POM and black specks.
![](https://easypurgeapc.com/wp-content/uploads/2020/01/HDV_0074.MP4.00_00_37_00.Still004.jpg)
The machine heat was increased up to the polyamide working temperature.
![](https://easypurgeapc.com/wp-content/uploads/2019/11/Hishiya-50-Tons-1.jpg)
The following step was purging using polyamide with Easypurge purging compound sachet.
![](https://easypurgeapc.com/wp-content/uploads/2020/01/HDV_0078.MP4.00_00_14_10.Still001.jpg)
Finally, PA was used to remove the rest of the purging material in order to start production.
![](https://easypurgeapc.com/wp-content/uploads/2020/01/material-limpio.png)
Final Results:
Purging Compound Consumed | Total Purging Time
| |
EasyPurge Purging Compound | 6 sachets (120Grs) | 15 Minutes |