This promising and evolving technology is marked by a variety of approaches to compounding and end product extrusion. In these diagrams, the term "wood" is used to identify any of the many forms of organic material used in these processes.
1. Pre-dried wood along with resin/regrinds and additives
all enter at the throat of a twin screw pelletizing extruder. | 
2. Pre-dried wood enters at twin screw pelletizing extruder throat with resin/regrind and additives introduced along the barrel.
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3. Continuous mixer discharges dry wood at twin screw extruder throat with resin/regrind and additives introduced along barrel to produce end product profile.
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4. A high-speed compounding extruder supplies multiple single or twin screw profiling extruders. Alternatively, compounding extruder feeds a gear pump to produce the profile.
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5. Wood enters twin screw extruder throat and is dried within the extruder.
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6. Multi-extrusion application with wood and resin, regrind, and additives on main twin screw extruder with single screw extruders discharging to die head.
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