The stability of an extruder can be measured by the pressure stability in the die adapter. If an extruder has issues getting a consistent feed (typical on extruders of 25-mm diam.
Or, as a less-expensive option, you can use a pressure-control setup that allows rapid control of screw speed to reduce variation measured in the die adapter. A control system that can graph the pressure readings is a very helpful tool for analyzing extrusion stability in a tubing system.
Two- or four-module assemblies are installed in the throat of the blown film die or die adapter
Nissel connected the extruder for the GPPS skin coating directly to the melt-thermocouple orifice on the die adapter
, resulting in a feedblock.
An unusual S-shaped die adapter
allowed a maker of PVC and polyethylene pipe to produce fiber-optic conduit without making a costly switch to crosshead dies.
The Unistack system's extruder has a universal-jointed die adapter
that adjusts both the die elevation and inclination.