Pelletizer/Research Development

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Pelletizer
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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

Wood Pelletizer
Sawdust from Sawmill
Grass Pellets
Wood Pellets


200px Roller die
Pellet diagram
Roller Die

Existing Open Source Designs

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

See Also

Useful Links


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Key Design Planning Prototype Almost done Full Release