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 intothe extruder at the operatingconditions used in Step 1.4. Once Ingeo biopolymer haspurged, reduce barreltemperatures to desired setpoints.5. At shutdown, purge machinewith high viscosity polystyreneor polypropylene.