A Device to Cut Bulk Modules of Tree Prunings

A device to cut bulk modules of tree prunings was developed as part of a harvesting system for prunings. The complete harvesting system includes a modified cotton module builder, module transporter, tub grinder, and the modular cutter. Modules of tree prunings made with a heavy duty module builder are cut into two of three sections with the module cutter. Module sections are then loaded into the tub grinder to produce marketable biomass products such as boiler fuel, mushroom compost, and others. The development of the module cutting device was a key link in the overall system. A full size prototype module cutter was designed, fabricated, and field tested. The forklift mounted machine consists of a C shaped rectangular frame 2.4 m high and 3 m long, open at the bottom, with a continuous tensioned saw chain driven around the inner periphery. The hydraulically driven saw chain is unsupported along the lower, cutting span. Two 3 m long forks mounted on an auxiliary mast of the forklift are used to lift the module and separate the cut to avoid chain binding and facilitate removal of the chain after cutting. Field tests over two pruning seasons indicated the machine would make amore » minimum of 11 cuts/h for a cost of $2.77/t ($2.51/ton) of wood. The actual performance was within the design specifications of the cutter.« less