Abstract: A method for comminuting material (which in one example may be a plastic or non-plastic material) contained within a plasticized matrix with a machine comprising a mechanism for comminuting said non plasticized matrix and dispersing the material throughout the matrix. The mechanism has at least two separate stages (each stage preferably including stationary plates and non-stationary plates), which cooperate to shear the material and to distribute, disperse and comminute the material into finely comminuted material distributed and dispersed throughout the plasticized material. The finely comminuted material is substantially distributed throughout the plasticized matrix and is so small and so dispersed throughout the plastic so as not to degrade unduly any use to which the plasticized matrix when solidified may be put to or any further process being carried out with respect to the plastic matrix.