Green Waste Shredders
The most widely used 'shredding' principles are the 'Hammer Mill' using a series of metal strips arranged on a shaft rotating at high speed, the material is 'hammered' against a curved plate with various size holes (screen) through which the material is forced, normally no more than 60cm (24") wide.
'Flail' type shredders generally used on wider machines have a high speed rotor to which are mounted 'Flails' of various size and shape, material is loaded into a hopper and conveyed into the Flails which 'shred' the material, in some cases it is also forced through a screen and either deposited on the ground or conveyed upwards into a pile, lorry or skip etc.
'Flails' per ton of material probably requires up to 300% more HP than 'Chippers'.
'Tub Grinders' were developed in the USA to reduce the 'Volume' of construction site waste, most use a heavy rotor with rigidly mounted hardened steel projections which 'Grind' the material against heavy variable size 'Screens', material is loaded into a 'Tub' above the rotor, typically they use 300 - 600hp.
The 'Disc-Shred' system is a series of discs on a shaft rotating inside a drum, the discs being angled to 'auger' the material towards and through a screen into the rear of a chipper flywheel and discharge chute.
The discs can also be rotated as the edge becomes blunt or damaged.
All forms of 'Green Waste' material can be processed.
Don't buy a shredder if it is a tree branch and scrub material NOT contaminated with soil, stones, metal etc.
Hammer Mill
A system used for many years in Agriculture, material is shredded and forced through a screen.
Tub-Grinder
Developed in the USA to reduce all forms of waste normally 300 - 600hp.
Flail Type
Various types of 'Flail' designs with 'infeed' conveyor, variable screen and discharge elevator.
Disc-Shred
Patented 'Disc-Shred' system developed by GreenMech, improved performance, reduced power & costs.