I'm currently searching for a way to make our profiles harder and (if possible) cheaper. Current density is about 250 kg/m³, durometer hardness 22-25 Sh.D.
The obvious way is to use some kind of mineral filler. Preliminary tests have shown that both talcum and calcium carbonate can be dosed up...
I'm currently trying to extrude a thin profile consisting of a low-density foamed PS core material with a coextruded PS layer (foamed or compact) on top to improve compressive strength.
Core is extruded at approx. 167°C, coextruded layer between 190 and 200°C.
What we see is that the top...
When trying to produce fairly large profiles in low-density XPS foam we are continually faced with corrugation. We thought memory effect interfered with the foaming when exiting the die but (greatly) increasing the land length of our die has had no effect at all. A tip, anyone?
