The paper presents the results of works carried out by the authors on the design and operation of organic material crushers. It is a widely undertaken research program started many years ago, in recent months devoted to testing the operational wear of a selected shredder and product. Previous research has involved different grinder designs and different ways of disintegrating basic biological materials. In the following years, parameters for different shredded materials were selected for the selected type of knife shredder. After reaching the "most difficult" material for disintegration, the analysis of the design of the shredders and the selection of the system for that particular material was resumed. Tests of structural elements, crucial for the system durability, show the complexity of the grinding process conditions. The selection of key parameters and the simulation of their influence on the course of the process allowed for the development of the process model. Subsequent simulations using the developed model allow you to select the parameters of the shredder in an optimal way.