Pelletizer/Research Development

Basics

• This page aims to organise and conduct research on the Pelletizer.

Main Types of Pelletizers

Screw Based

• Similar to a filament extruder, but with a rotating "cutter" on one end
• Changing the speed of the cutter wheel changes the pellet length
• Due to being able to seal the tube, and still run the screw, can higher densities be reached due to the increased pressure? Needs More Research
• These have less throughput, so may not be the best option for large scale use, but better for home use perhaps

Die Based

• Typically use a roller, and a sort of mesh/honecomb with the holes being the shape and dimention of the pellets
• Powder is added to the top and is pushed through the mesh making pellets
• VERY high throughput
• Often unpressed powder mixed in output, so more post processing is needed such as a shaker grate
• May have less pressure and thus lower density?
• Also can pellet length be varied (perhaps swapping screen for one with longer "tubes"
  • OR some sort of dual mesh device with rotating wheels with holes, so it can be "sealed" like the screw extruder?

Walkthrough

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Wood Pelletizer

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Sawdust from Sawmill

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Grass Pellets

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Wood Pellets

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200px Roller die

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Pellet diagram

Roller Die

Existing Open Source Designs

French Site from 2022

Hello, I present to you my French site. I am mainly looking for how to build machines that can exploit the biomass of the high Pyrenean valleys, such as wood chippers and pellet presses. Cordially http://microressources.a4w.fr/ http://microressources.a4w.fr/fabriquer-ses-propres-granules-de-bois-avec-une-machine-a-pellet/

Precious Plastic

• Odd idea, but could the Precious Plastic Extrusion Machine , or especially the pro version, be modified to handle non-plastic pellet making?
• Main concern is dust getting where it shouldn't, but molten plastic is viscous, and tends to leak, so perhaps it will be fine?
• Also are the required pressures reached?
• Also a powder hopper, a stepper motor, and the cutting disk seem like the only additions needed

Industry Standards

• Richi Pelletizer - [1]; wood - [2]

See Also

• Nick on the Pelletizer
• Pelletizer die and roller quote - Quote
• Kiln

Useful Links

• Chinese supplier of pelletizers
• Pellet Burners
• Images of Rollers and Dies
• Penn State on manufacturing fuel pellets

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Key	Design	Planning	Prototype	Almost done	Full Release