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 Series Machines 

Industrial, pilot-scale rotary shear.

M24M Series Machines 

Small scale industrial rotary shear.

M24P Series Machines 

Pilot-scale commercial rotary shear.

M24S Series Machines 

Small-scale industrial ChipMuncher™ rotary shear.

M8M Series Machines 

Research and lab rotary shear.

M8L Series 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.

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Read more about our Crumbler® technology:

Crumbler Cutterset

Beneficiation of Chipped and Shredded Woody Biomass

Abstract Forest Concepts, with funding from USDA NIFA SBIR program, developed methods and equipment to reprocess low-value dirty forest chips, tree service chips, and hog fuel into high value clean wood fiber and other valuable fractions. Traditional clean sources of

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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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