Trommel screen

A trommel screen is a rotating cylindrical sieve that separates materials by size as they pass through perforated or mesh-covered sections.

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Rotary screening: A screening method that separates materials using a rotating surface with openings. A trommel is a cylindrical implementation of this broader screening method.
Municipal solid waste: Waste collected by or on behalf of a municipality from households, businesses, and public spaces. Trommels separate size fractions in facilities that sort mixed municipal waste.
Vibrating screen: A screening machine that uses vibration to move material across one or more screening surfaces. It separates material through vibration rather than a rotating cylindrical drum.
Air classification: A separation process that uses airflow to sort particles by aerodynamic behavior. It separates by aerodynamic response rather than passage through drum openings.
Particle size distribution: A description of the relative amounts of particles across different sizes in a material sample. The screen divides its feed into fractions whose size distributions depend on its apertures.
Composting: The controlled biological decomposition of organic materials into a stable soil amendment. Trommel screens remove oversize material from finished compost and screen feedstock.
Grizzly screen: A coarse screen made from spaced bars that removes large pieces from a material stream. Its stationary bars handle coarse scalping, unlike a trommel’s rotating perforated cylinder.
Hydrocyclone: A conical device that separates particles from a fluid using centrifugal forces. It classifies suspended particles in a liquid, unlike a trommel’s dry or damp screening.
Screen aperture: An opening in a screening surface through which sufficiently small particles can pass. Aperture dimensions set the nominal size boundary between trommel products.
Mineral processing: The preparation of mined materials through operations that separate valuable minerals from waste. Trommels classify ore and aggregate within broader mineral-processing circuits.