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:

Particle Sieve Distribution

Processing Powerline Vegetation Management Biomass for Use in Distributed-Scale Gasifiers

Pacific Gas and Electric (PG&E) sponsored a project to explore methods to gather powerline vegetation management woody biomass and process it into feedstocks optimized for delivery to distributed-scale gasifiers. A pilot study was conducted in Lake County, California where powerline trimmings were either chipped or baled, then ground at a central biomass processing facility, and finally milled / screened to achieve particle size distributions specified by a gasifier manufacturer. The vegetation included oak, pine, walnut, and other hardwoods. All materials were successfully processed into feedstocks.

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