A shredding assembly is disclosed which includes a fixed blade array and a rotatable blade array configured to rotate relative to the fixed blade array about a rotational axis. The rotatable blade array has a plurality of rotatable blades. A rotatable blade includes a main body extending in an outwardly radial direction with respect to the rotational axis, a first cutting face configured for cutting in a first rotational direction of the rotatable blade array, and a second cutting face configured for cutting in a second rotational direction of the rotatable blade array. The plurality of rotatable blades are interspersed with the fixed blade array such that, during rotation of the rotatable blade array, at least a portion of the radial extent of the main body passes through a gap between adjacent fixed blades of the fixed blade array.

A method of processing coir includes using a cylinder having spikes on an outside surface of the cylinder to shred compressed coir into dry, shredded coir. A method of processing coir includes using a rotating cylinder with spikes on an outside surface of the cylinder to shred compressed coir into dry, shredded coir and hydrating the dry, shredded coir to a predetermined moisture level to produce moist coir.

Embodiments are disclosed of an apparatus with a first planar cutter including a center and a plurality of through-holes and a second planar cutter positioned on the first planar cutter and including a center and a plurality of through-holes. An axle passes through the center of the first planar cutter and is coupled to the center of the second planar cutter, so that rotation of the axle produces rotation of the second planar cutter relative to the first planar cutter. At least the surface of one of the first planar cutter and the second planar cutter is made of a friction-reducing material.

A means for hardfacing cutting blades used in industrial machinery by creating a channel in the surfaces of an oversize cutting blade that may be filled with hardface weld and machining the outer edge of the main body and channel to create a desired finish profile with a hardfaced edge. Such a cutting blade may additionally have fixed points of reference on the cutting blade which may be used to automate some or all of the process of creating and/or hardfacing a cutting blade to the desired profile.

Featured are a two-stage grinder, an apparatus embodying same and methods related thereto. Such a medical waste grinder includes a first stage and a second stage. The first stage includes spring loaded cutter stacks mounted on two adjacent shafts between two edge plates, each of the cutter stacks including cutters arranged in a helix to create space, each cutter including a number of teeth per blade and including a major diameter and a minor diameter, each cutter turning opposite a fixed counter knife enabling a pinching action against the teeth of the cutter. The second stage includes spring loaded cutter stacks.

A crushing machine construction kit for the construction of a crushing machine contains a drive device and a frame of a crushing device. The crushing machine construction kit further contains at least two shear shafts and at least two shredder shafts for the selective configuration of the crushing machine as a rotary shear or as a rotary shredder. A method converts the rotary shredder into the rotary shear.

A method for producing clean black mass, anode or cathode for subsequent recycling is provided, the method comprising subjecting an intact battery to a shredding process to produce an aggregate, wherein the smallest particle generated is between 2.5 percent and 40 percent of original battery size. Also provided is a shredder for minimizing aggregation of whole batteries, the shredder comprising a shaft defining a longitudinal axis and a latitudinal axis; and a plurality of teeth disposed on said knives which fit on said shaft at an angle to the latitudinal axis selected from 15 degrees and 45 degrees, wherein the teeth have a first proximal end integrally molded to the shaft and a second free distal end.

Disclosed is a mill comprising a grinding unit, wherein a rotatable blade element (9) drivable by a motor (2) is arranged in the grinding unit. The blade element (9) has a hub portion and an outer ring portion concentric with an axis of rotation of the blade element (9), which are connected by at least one curved web, the blade element (9) having at least one through-passage at its outer circumference in connection with a space between the hub portion and the outer ring portion.

An impact cutter blade and holder system is disclosed. The impact cutter blade and holder system includes: a cutter disk, a plurality of impact holders, and a plurality of impact cutter blades. The cutter disk has a central axis about which the cutter disk is configured to rotate. The plurality of impact holders are secured to the cutter disk. The plurality of impact cutter blades is secured to the plurality of impact holders.

A method for processing coir comprising processing dry coir by shredding, hydrating the coir up to a specified moisture content, and pelletizing the coir. An apparatus for pelletizing coir comprising a metal disk having flat, cylindrical openings. A soil additive composition comprising coir, seed, basalt, root stimulant, lime, worm castings, fish meal, molasses, and polymer.