Crumbler® Rotary Shear

Save Costs and Improve Feedstock Quality

Size reduction is a key processing step for feedstocks. Traditional methods include hammermills, grinders, and chippers. However, these methods typically are either limited to producing ½” and larger particles or require pre-drying of biomass at a substantial energy cost. Additionally, these methods may produce large amounts of fines with wide particle distributions and poor flowability.

Forest Concepts developed the Crumbler® rotary shear to address these common problems and produce a superior result.

Key Benefits: 

  • Processes any moisture content – no pre-drying necessary
  • Scalable for both small & industrial-scale operations
  • Tested on many materials – wood, recyclables, corn stover, hemp & more (see the complete list)
  • Results in evenly shaped highly-flowable particles with less fines 
  • Efficiently produces particles as small as 1mm
  • Quiet performance – our in-house experience demonstrates that Crumbler® operates at 85 db versus traditional hammermill at 110-120 db
  • Low carbon footprint (learn more)
  • 100% manufactured in the USA
We are pleased to offer our Crumbler® rotary shear in a range of models to suit your project. Each of our Crumbler® models can be customized as needed. Not sure which Crumbler® model is right for you? One of our engineers can help – just ask.

P24 Family Machines 

Industrial, pilot-scale rotary shear.

M24M Family Machines 

Small scale industrial rotary shear.

M24P Family Machines 

Pilot-scale commercial rotary shear.

M24S Family Machines 

Small-scale industrial ChipMuncher™ rotary shear.

M8M Family Machines 

Research and lab rotary shear.

M8L Family Machines

Rotary shear system for lab and research use.

Crumbler® Processing Heads

Designed for optimal particle size reduction. Required for all Crumbler® rotary shear machines.

Related Items to Consider

Read more about our Crumbler® technology:

Crumbles with Hand

Shear Processing of Wood Chips into Feedstock Particles

Abstract We have an objective to convert cellulosic biomass raw materials into small particles that are optimized for biochemical and/or thermochemical conversion to liquid transportation fuels. As a side effort, we are interested in producing feedstocks for composite bioproducts, solid

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