CO2 blown Cellulose Acetate Polymer Extruder

Designing and building a cellulose acetate (or some similar renewable polymer) extruder, with foam die and CO2 blowing agent

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Not an extruder for 3D printing, but for making foam sheet.

Looking to use supercritical CO2.

Currently researching casting/milling methods- seems most appropriate to cast a rough shape with the blades then mill it rather than milling a cylinder down. Willing to build a vacuum chamber for the casting.

I did notice screws can break under the pressure & temperature gradients involved in extrusion.

Will first have search literature for optimal blade design. I noticed a lapsed Japanese patent describing the particular foam I want to produce. I've been researching this for a year or so now, but other projects come first.

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