Search Terms
Plastic pelletizer Plastic granulator Fiber Chopping Machines Industrial plastic filament chopper Filament Granulation Polymer Granulation Granulation effects on polymer mixing polymer granules or pellets
Articles and Papers about Filament Choppers or Pelletizers
High Speed Pelletizer, no size control: https://www.thingiverse.com/thing:397524 Low speed cutter, using same hardware as the Recyclebot extruder: http://www.soliforum.com/topic/5159/filament-pelletizer/ Industrial Fiber Choppers: https://www.chopcot.com/fiber-chopping-machines/index.html
Peer reviewed
Granulated Plastic in concrete (Composite): https://www.sciencedirect.com/science/article/pii/S0956053X07003054
I couldn't find any peer reviewed articles about the process of turning filament into pellets, all I could find was companies that use the technology to make their base resins or composite masterbatches.