Startup and ShutdownIngeo biopolymer 4032D is not compatible with a wide variety of commodity resins, and special purging sequences should be followed:1. Clean extruder and bring temperatures to steady state with low viscosity, general purpose polystyrene or polypropylene.2. Vacuum out hopper system to avoid contamination.3. Introduce Ingeo biopolymers into the extruder at the operating conditions used in Step 1.4. Once Ingeo biopolymer has purged, reduce barrel temperatures to desired set points.5. At shutdown, purge machine with high viscosity polystyrene or polypropylene.