Does anyone have experience with SMMA molding?
Looking for expert advise on screw types, typical injection pressures, risks and general process knowledge.
1) NEVER, NEVER run it wet or into a mold that is sweating as any moisture added to the melt can eat hot runners and molds.
2) SMMA typically needs very little pack/hold time. Run your gate freezes studies!
Injection pressures will be very high as it normal pushes very hard. Do not run over the manufacturers recommended melt temps in order to fill the tool. If your having filling problems, open up the gate thickness and runner diameters.
Machine screws design can be general purpose or low compression but don't use a high compression "pumping" screw.