A shredder includes a shredder box having a first end wall, a second end wall, and opposite side walls extending between the first and second end walls. A lower discharge opening discharges shredded material from the shredder box. A shredder rotor is positioned within an interior of the shredder box, the shredder rotor being rotatable about a rotor axis and including a main rotor body and plurality of rotor teeth mounted to the main rotor body. A shredder comb is positioned adjacent to the shredder rotor and includes comb teeth that intermesh with the rotor teeth. An upper hopper is located above the shredder box for receiving material to be shredded. The upper hopper includes an upper hopper end wall formed with a concavity to facilitate feeding of material to be shredded into the shredder box and to the shredder rotor.

The present invention relates to an equipment in the field of hygiene article manufacturing, in particular to a hygiene article recycling unit for disintegrating and separating hygiene articles allowing to separate raw materials at a purity allowing to directly use it in the manufacturing process of the hygiene articles. The recycling unit comprised several devices as sub-units. The present invention further relates to a process for operating such an equipment.

A system arrangement for grinding starting materials. Such a system arrangement thereby includes an agitator bead mill with filling system for starting materials to be ground and a classifier wheel, which is coupled to the agitator bead mill. The filling system as well as the classifier wheel are thereby arranged essentially horizontally with respect to a longitudinal extension of the agitator bead mill. In addition, a method for grinding starting materials is shown.

A wood chipper and a method of using the wood chipper are provided. The wood chipper has a rotating chipping drum with blades for reducing the size of wood fed to the chipping drum. The chipper also includes a sizing screen positioned below the chipping drum and a discharge conveyor positioned below the sizing screen. The discharge conveyor mechanically conveys wood chips from the chipping drum to a discharge point. The chipping drum has multiple pockets positioned around the exterior of the drum, and one of the blades is mounted adjacent to each one of the pockets. The pockets and blades are arranged in a configuration that consistently produces wood chips that are uniformly sized.

Provided is an ultrafine pulverization system for rhizome traditional Chinese medicine (TCM), relating to the technical field of TCM processing, and comprising a coarse pulverizer and a fine-ultrafine pulverizer, a feeding elevator is provided on one side of the coarse pulverizer, and a screw feeder is provided between the coarse pulverizer and the fine-ultrafine pulverizer; the coarse pulverizer includes a coarse pulverization base and a coarse pulverization upper housing, the coarse pulverization rotor is provided in a coarse pulverization blade assembly; the coarse pulverization rotor is connected to a first driving mechanism; and the fine-ultrafine pulverizer includes a fine pulverization device, a pneumatic classification device, and an ultrafine pulverization device being provided in turn from top to bottom, an annular air bag is provided outside the ultrafine pulverization device, the fine pulverization device and the ultrafine pulverization device are communicated with each other through a number of blanking channels.

A cutting screen for use in wet grinders with an inner peripheral region, an outer peripheral region, and a cutting screen having a working region of blank sections and material sections. The working region is scraped over by at least one cutting edge in operation. A circumferential ratio (UV) is the ratio of accumulated lengths of material sections along a circumferential line, and at least one continuous, circumferential function F exists for the cutting screen, which maps a circumferences U onto a reference circumferential ratio RUV, wherein the circumferential ratio (UV) for each circumference U of a circle concentric to the working region of the cutting screen and lying within the working region does not deviate from the reference circumferential ratio RUV=F(U) more than 0.05 of the reference circumferential ratio (RUV) at the respective circumference.