More on polymer fouling of the auger...

I removed the auger from the extruder again prior to setting up for a new extrusion test, this time with a heated quenching bath. Polymer melt was again found to have formed as far back as 50 mm from the end of the auger. This means that the meltdown is confined to the PTFE thermal barrier zone and does not extend into the zone of the steel polymer pump barrel.Just as a side note, the German masonry auger is double flighted and is supplied by Artu USA.

It is made of chrome vanadium steel and appears to be titanium coated if the colour is any guide.